EP2935151A1 - Matériau céramique - Google Patents

Matériau céramique

Info

Publication number
EP2935151A1
EP2935151A1 EP13811508.4A EP13811508A EP2935151A1 EP 2935151 A1 EP2935151 A1 EP 2935151A1 EP 13811508 A EP13811508 A EP 13811508A EP 2935151 A1 EP2935151 A1 EP 2935151A1
Authority
EP
European Patent Office
Prior art keywords
ppm
ceramic material
ceramic
material according
impurities
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP13811508.4A
Other languages
German (de)
English (en)
Inventor
Lars Schnetter
Frank Wittig
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Ceramtec ETEC GmbH
Original Assignee
Ceramtec ETEC GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Ceramtec ETEC GmbH filed Critical Ceramtec ETEC GmbH
Publication of EP2935151A1 publication Critical patent/EP2935151A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
    • C04B35/01—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics
    • C04B35/10—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics based on aluminium oxide
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
    • C04B35/01—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics
    • C04B35/44—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics based on aluminates
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
    • C04B35/01—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics
    • C04B35/10—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics based on aluminium oxide
    • C04B35/111—Fine ceramics
    • C04B35/115—Translucent or transparent products
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
    • C04B35/01—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics
    • C04B35/44—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics based on aluminates
    • C04B35/443—Magnesium aluminate spinel
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
    • C04B35/01—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics
    • C04B35/48—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics based on zirconium or hafnium oxides, zirconates, zircon or hafnates
    • C04B35/486—Fine ceramics
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
    • C04B35/50—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on rare-earth compounds
    • C04B35/505—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on rare-earth compounds based on yttrium oxide
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
    • C04B35/515—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on non-oxide ceramics
    • C04B35/58—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on non-oxide ceramics based on borides, nitrides, i.e. nitrides, oxynitrides, carbonitrides or oxycarbonitrides or silicides
    • C04B35/581—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on non-oxide ceramics based on borides, nitrides, i.e. nitrides, oxynitrides, carbonitrides or oxycarbonitrides or silicides based on aluminium nitride
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
    • C04B35/622—Forming processes; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
    • C04B35/626—Preparing or treating the powders individually or as batches ; preparing or treating macroscopic reinforcing agents for ceramic products, e.g. fibres; mechanical aspects section B
    • C04B35/62605—Treating the starting powders individually or as mixtures
    • C04B35/6261—Milling
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
    • C04B35/622—Forming processes; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
    • C04B35/626—Preparing or treating the powders individually or as batches ; preparing or treating macroscopic reinforcing agents for ceramic products, e.g. fibres; mechanical aspects section B
    • C04B35/62605—Treating the starting powders individually or as mixtures
    • C04B35/62645—Thermal treatment of powders or mixtures thereof other than sintering
    • C04B35/62655—Drying, e.g. freeze-drying, spray-drying, microwave or supercritical drying
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
    • C04B35/622—Forming processes; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
    • C04B35/626—Preparing or treating the powders individually or as batches ; preparing or treating macroscopic reinforcing agents for ceramic products, e.g. fibres; mechanical aspects section B
    • C04B35/62605—Treating the starting powders individually or as mixtures
    • C04B35/62695—Granulation or pelletising
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
    • C04B35/622—Forming processes; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
    • C04B35/64—Burning or sintering processes
    • C04B35/645—Pressure sintering
    • C04B35/6455—Hot isostatic pressing
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
    • C04B2235/02—Composition of constituents of the starting material or of secondary phases of the final product
    • C04B2235/30—Constituents and secondary phases not being of a fibrous nature
    • C04B2235/32—Metal oxides, mixed metal oxides, or oxide-forming salts thereof, e.g. carbonates, nitrates, (oxy)hydroxides, chlorides
    • C04B2235/3217—Aluminum oxide or oxide forming salts thereof, e.g. bauxite, alpha-alumina
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
    • C04B2235/02—Composition of constituents of the starting material or of secondary phases of the final product
    • C04B2235/30—Constituents and secondary phases not being of a fibrous nature
    • C04B2235/32—Metal oxides, mixed metal oxides, or oxide-forming salts thereof, e.g. carbonates, nitrates, (oxy)hydroxides, chlorides
    • C04B2235/3217—Aluminum oxide or oxide forming salts thereof, e.g. bauxite, alpha-alumina
    • C04B2235/3222—Aluminates other than alumino-silicates, e.g. spinel (MgAl2O4)
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
    • C04B2235/02—Composition of constituents of the starting material or of secondary phases of the final product
    • C04B2235/30—Constituents and secondary phases not being of a fibrous nature
    • C04B2235/32—Metal oxides, mixed metal oxides, or oxide-forming salts thereof, e.g. carbonates, nitrates, (oxy)hydroxides, chlorides
    • C04B2235/3224—Rare earth oxide or oxide forming salts thereof, e.g. scandium oxide
    • C04B2235/3225—Yttrium oxide or oxide-forming salts thereof
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
    • C04B2235/02—Composition of constituents of the starting material or of secondary phases of the final product
    • C04B2235/50—Constituents or additives of the starting mixture chosen for their shape or used because of their shape or their physical appearance
    • C04B2235/54—Particle size related information
    • C04B2235/5409—Particle size related information expressed by specific surface values
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
    • C04B2235/02—Composition of constituents of the starting material or of secondary phases of the final product
    • C04B2235/50—Constituents or additives of the starting mixture chosen for their shape or used because of their shape or their physical appearance
    • C04B2235/54—Particle size related information
    • C04B2235/5418—Particle size related information expressed by the size of the particles or aggregates thereof
    • C04B2235/5436—Particle size related information expressed by the size of the particles or aggregates thereof micrometer sized, i.e. from 1 to 100 micron
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
    • C04B2235/02—Composition of constituents of the starting material or of secondary phases of the final product
    • C04B2235/50—Constituents or additives of the starting mixture chosen for their shape or used because of their shape or their physical appearance
    • C04B2235/54—Particle size related information
    • C04B2235/5463—Particle size distributions
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
    • C04B2235/60—Aspects relating to the preparation, properties or mechanical treatment of green bodies or pre-forms
    • C04B2235/608—Green bodies or pre-forms with well-defined density
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
    • C04B2235/70—Aspects relating to sintered or melt-casted ceramic products
    • C04B2235/72—Products characterised by the absence or the low content of specific components, e.g. alkali metal free alumina ceramics
    • C04B2235/725—Metal content
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
    • C04B2235/70—Aspects relating to sintered or melt-casted ceramic products
    • C04B2235/72—Products characterised by the absence or the low content of specific components, e.g. alkali metal free alumina ceramics
    • C04B2235/728—Silicon content
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
    • C04B2235/70—Aspects relating to sintered or melt-casted ceramic products
    • C04B2235/74—Physical characteristics
    • C04B2235/76—Crystal structural characteristics, e.g. symmetry
    • C04B2235/762—Cubic symmetry, e.g. beta-SiC
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
    • C04B2235/70—Aspects relating to sintered or melt-casted ceramic products
    • C04B2235/74—Physical characteristics
    • C04B2235/77—Density
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
    • C04B2235/70—Aspects relating to sintered or melt-casted ceramic products
    • C04B2235/96—Properties of ceramic products, e.g. mechanical properties such as strength, toughness, wear resistance
    • C04B2235/9646—Optical properties
    • C04B2235/9653—Translucent or transparent ceramics other than alumina

Definitions

  • the invention relates to ceramic materials;
  • the invention relates to ceramic materials for the production of transparent ceramics.
  • Transparent ceramics and their preparation are known from the prior art.
  • DE 10 2004 004 259 B3 discloses a polycrystalline ceramic with a high mechanical load capacity, which has a true in-line transmission (RIT) of more than 75% of the theoretical maximum value for a 0.8 mm thick polished disk and at wavelengths between 600 and 650 nm, wherein the mean grain size D is in the range between 60 nm and 10 ⁇ .
  • RIT true in-line transmission
  • polycrystalline ceramic disks The transparency of polycrystalline ceramic disks is influenced by various factors. So of course, a material must be used that has only a very low light absorption. In addition, the transparency of polycrystalline ceramic discs depends essentially on the light scattering, which results from the crystal structure on the one hand and from the microstructure of the ceramic body on the other hand. Materials with cubic crystal systems are preferably used because birefringence does not occur. Furthermore, the processes for the production of transparent ceramics are optimized in such a way that the lowest possible porosity occurs, or the pore size is below the wavelength of the light, in order to minimize the light scattering at phase boundaries.
  • the object of the invention is thus to provide alternative ceramic materials which are suitable for the production of transparent ceramics and which are less expensive than the high purity raw materials known in the art.
  • This ceramic material is characterized in that it consists of metal oxides, which are obtained by calcination of hydrotalcites.
  • the material can preferably be used to produce transparent ceramics.
  • Hydrotalcites according to the invention are metal hydroxides prepared by a hydrotalcite process.
  • a transparent ceramic according to the invention is understood to mean a ceramic which has an RIT of at least 40% at 300 nm, 600 nm and / or 1500 nm wavelength of the light. Theoretically, the transparency is independent of thickness, if a perfect material is present and from it a perfect ceramic was produced. As soon as the ceramic, however, pores o.ä. contains a scattering effect at the phase boundaries of the pores, which becomes stronger with increasing thickness of the ceramic. This effect leads to a decreasing transparency. Therefore, referred to in this document transparencies refer to ceramics with wall thicknesses between 50 ⁇ and 100 mm.
  • the hydrotalcites, from which the ceramic material according to the invention is obtained by calcining are produced by means of a hydrotalcite process.
  • Hydrotalcite processes are known in the art. Such a method is described for example in EP 0 807 086 B1.
  • a hydrotalcite process in the context of this invention is understood as meaning a process which comprises at least the following steps:
  • the metal oxides which are obtained by calcination from the metal hydroxides between 100 and 500 ppm, preferably between 100 and 200 ppm impurities, in particular of Fe, Mn, Cr, V, Zn, Sn, Ti, Si, Zr, Ca, Na, K, Li, Y, Ni, Co, Cu.
  • impurities in particular of Fe, Mn, Cr, V, Zn, Sn, Ti, Si, Zr, Ca, Na, K, Li, Y, Ni, Co, Cu.
  • the higher level of contamination is possible because the impurities are very finely divided and very homogeneous, possibly at the atomic level, present in the material. In any case, they do not form a separate phase, for example a grain boundary phase, which would lead to a reduction in transparency in the sintered ceramic. It is believed that the impurities are incorporated in the lattice of metal oxides. This means the incorporation of the metal cations in the lattice of the spinel, for example, cation lattice, interstitial sites, or the like.
  • transparent ceramics can be produced with the raw material according to the invention which have a deviation in the RIT value of ⁇ 10% between 300 nm and 700 nm, in particular at 300 nm and 700 nm, and thus obtain a high white value.
  • metal hydroxides whose metal oxides have a cubic crystal system.
  • oxides like the Al 2 O 3 or MgO particularly preferably spinels, in particular Mg-Al spinels are produced.
  • transparent ceramics of ZrO 2 oxides of mixtures of Y and Al and materials of the mixtures of Al, N, O or even non-cubic aluminum oxide can preferably be produced by this process.
  • the use of the material according to the invention completely dispenses with the use of sintering aids.
  • Sintering aids allow the use of lower sintering temperatures with less grain growth.
  • the sintering aids must be at least partially expelled again by means of volatile compounds such as LiF, since they would otherwise be present as a separate phase in the ceramic, which in turn would have negative effects on the transparency.
  • volatile compounds such as LiF
  • Diammonium hydrogen citrate stirred is ground with a stirred ball mill (500 m Al 2 O 3 grinding beads) until an energy input of 1.60 kWh / kg is reached.
  • the following particle size distribution is then available: d90: 375 nm, d50: 224 nm, d10: 138 nm (measured with a Nanoflex measuring instrument from Microtrac).
  • the specific surface area (BET) is 25.5 m 2 / g.
  • the thus prepared slurry is mixed with 6% of a short-chain polyethylene glycol and granulated by means of a freeze-spray process. After this
  • the samples are ground and polished to a thickness of 2 mm for a transmission measurement:
  • the treatment is carried out analogously to Example 1 until an energy input of 1.05 kWh / kg is reached.
  • the following particle size distribution is then present: d90: 345 nm, d50: 195 nm, d10: 124 nm (measured with a Nanoflex measuring instrument from Microtrac), BET 23.5 m 2 / g.
  • the thus prepared slurry is mixed with 6% of a short-chain polyethylene glycol and granulated by means of a freeze-spray process. After this
  • Freeze-drying is a moldable granulate from which test pieces are formed having a net basis of 2.07 g / cm 3 . These are pre-sintered at 1400 ° C for 2 h at 3.512 g / cm 3 and then post-densified at 1650 ° C for 6 h at 200 MPa hot isostatic.
  • the samples are ground and polished to a thickness of 2 mm for a transmission measurement:
  • Example 3 A MgOAl 2 O 3 raw material with 156 ppm impurities, which was produced by the hydrotalcite process and has the following composition (ICP analysis), is used:
  • 600 g of the raw material are added to 600 g of deionized water at 4.7%
  • Diammonium hydrogen citrate stirred is ground with a stirred ball mill (500 m Al 2 O 3 grinding beads) until an energy input of 1.5 kWh / kg is reached.
  • the specific surface area (BET) is then 51.3 m 2 / g.
  • the thus prepared slip is admixed with 5% of an aqueous polymer dispersion and 4% of a fatty acid preparation and granulated by means of a freeze spray method. After freeze-drying, there is a moldable granule from which test pieces having a net basis of 2.18 g / cm 3 are formed. These are pre-sintered at 1550 ° C for 2 h to 3.413 g / cm 3 and then post-densified at 1650 ° C for 6 h at 200 MPa hot isostatic.
  • the samples are ground and polished to a transmission measurement of 2 mm thickness: The following RIT values were determined as a function of the wavelength: 300 nm: 70%, 600 nm: 75%, 700 nm: 77%, 1500 nm: 79%.
  • the compacts produced with a net comparable green density of 1 89 g / cm 3 are at 1430 ° C for 2 h to 3.524 g / cm 3 pre-sintered and then hot isostatic pressed at 1650 ° C, for 6 hours at 200 MPa.
  • the samples are ground and polished to a thickness of 2 mm for a transmission measurement: no RIT values can be measured.
  • the samples are ground and polished to a thickness of 2 mm for a transmission measurement: no RIT values can be measured.
  • the samples are
  • Freeze-drying is a moldable granulate, are formed from the sample with a net green density of 1, 91 g / cm 3 . These are pre-sintered at 1530 ° C for 2 h at 3.057 g / cm 3 and then post-densified at 1650 ° C for 4 h at 200 MPa hot isostatic.
  • the samples are ground and polished to a thickness of 2 mm for a transmission measurement:
  • the slip is granulated as described in Example 5.
  • the comparatively produced compacts having a net green density of 1.87 g / cm 3 are pre-sintered at 1410 ° C. for 2 h to 3.452 g / cm 3 and then hot isostatically compressed at 1650 ° C. for 6 h at 200 MPa.
  • the samples are ground and polished to a thickness of 2 mm for a transmission measurement: no RIT values can be measured.
  • the samples are ground and polished to a thickness of 2 mm for a transmission measurement: no RIT values can be measured.
  • the samples are

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Ceramic Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Organic Chemistry (AREA)
  • Structural Engineering (AREA)
  • Materials Engineering (AREA)
  • Inorganic Chemistry (AREA)
  • Composite Materials (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Compositions Of Oxide Ceramics (AREA)
  • Compounds Of Alkaline-Earth Elements, Aluminum Or Rare-Earth Metals (AREA)

Abstract

L'invention concerne la production de céramiques transparentes. Elle concerne en particulier l'utilisation de matières premières contenant des impuretés pour la production de céramiques transparentes.
EP13811508.4A 2012-12-19 2013-12-19 Matériau céramique Withdrawn EP2935151A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102012223802 2012-12-19
PCT/EP2013/077304 WO2014096142A1 (fr) 2012-12-19 2013-12-19 Matériau céramique

Publications (1)

Publication Number Publication Date
EP2935151A1 true EP2935151A1 (fr) 2015-10-28

Family

ID=49876628

Family Applications (1)

Application Number Title Priority Date Filing Date
EP13811508.4A Withdrawn EP2935151A1 (fr) 2012-12-19 2013-12-19 Matériau céramique

Country Status (10)

Country Link
US (2) US20150299044A1 (fr)
EP (1) EP2935151A1 (fr)
JP (1) JP2016500362A (fr)
KR (1) KR20150097714A (fr)
CN (1) CN105263885A (fr)
AU (1) AU2013360718A1 (fr)
DE (1) DE102013226579A1 (fr)
IL (1) IL239343A0 (fr)
RU (1) RU2015129336A (fr)
WO (1) WO2014096142A1 (fr)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2013068576A1 (fr) * 2011-11-10 2013-05-16 Ceramtec-Etec Gmbh Procédé pour produire des objets en céramique transparente par granulation en lit fluidisé
WO2015144717A1 (fr) 2014-03-28 2015-10-01 Ceramtec Gmbh Platine et/ou corps de refroidissement translucide, muni d'une led
JP6845645B2 (ja) * 2016-09-26 2021-03-24 タテホ化学工業株式会社 酸化マグネシウム含有スピネル粉末及びその製造方法
US20230357086A1 (en) * 2019-05-14 2023-11-09 Calix Ltd A System and Method for the Production of High Strength Materials

Family Cites Families (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4396595A (en) * 1982-02-08 1983-08-02 North American Philips Electric Corp. Method of enhancing the optical transmissivity of polycrystalline alumina bodies, and article produced by such method
JPH0672045B2 (ja) * 1988-07-05 1994-09-14 住友電気工業株式会社 透光性スピネル焼結体及びその製造方法
DE19503522A1 (de) * 1995-02-03 1996-08-08 Rwe Dea Ag Herstellung gemischter schichtförmig aufgebauter Metallhydroxide sowie deren Metalloxide
CN1049881C (zh) * 1995-12-15 2000-03-01 国家建筑材料工业局人工晶体研究所 一种透明多晶尖晶石的制备方法
JP3783445B2 (ja) * 1999-01-29 2006-06-07 住友化学株式会社 透光性アルミナ焼結体の製造方法およびその用途
CA2308933C (fr) * 1999-05-19 2008-07-22 Ngk Spark Plug Co., Ltd. Ceramique polycristalline translucide et methode de fabrication
JP3440299B2 (ja) * 2000-11-15 2003-08-25 独立行政法人物質・材料研究機構 透明スピネル焼結体の製造法
DE102004004259B3 (de) 2004-01-23 2005-11-24 Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. Transparente polykristalline Sinterkeramik kubischer Kristallstruktur
US8133051B2 (en) * 2004-08-27 2012-03-13 Tosoh Corporation Orthodontic bracket and process for producing the same
JP2006273679A (ja) * 2005-03-30 2006-10-12 Sumitomo Electric Ind Ltd スピネル焼結体、光透過窓および光透過レンズ
JP4830911B2 (ja) * 2007-03-02 2011-12-07 住友電気工業株式会社 スピネル焼結体、その製造方法、透明基板と液晶プロジェクター
FR2917404B1 (fr) * 2007-06-15 2009-09-04 Saint Gobain Ct Recherches Produit fritte de structure cubique.
JP2009126749A (ja) * 2007-11-26 2009-06-11 Sumitomo Electric Ind Ltd 透明多結晶スピネル基板とその製造方法および前記基板を用いた光学製品
US8268286B2 (en) * 2008-11-06 2012-09-18 General Electric Company High strength, fine grained spinel for window applications, methods of manufacture thereof and articles comprising the same
EP2808313B1 (fr) * 2008-11-18 2018-05-02 Tosoh Corporation Corps fritté d'alumine colorée à haute ténacité et translucidité élevée, son procédé de production et ses utilisations
JP5435397B2 (ja) * 2009-04-02 2014-03-05 住友電気工業株式会社 スピネル製光透過用窓材及びその製造方法
DE102009046036B4 (de) * 2009-10-27 2014-02-13 Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. Verfahren zur Herstellung von redispergierbaren hochreinen Nanospinellpulvern und redispergierbares hochreines Nanospinellpulver

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
None *
See also references of WO2014096142A1 *

Also Published As

Publication number Publication date
KR20150097714A (ko) 2015-08-26
RU2015129336A (ru) 2017-01-25
IL239343A0 (en) 2015-07-30
CN105263885A (zh) 2016-01-20
US20180093923A1 (en) 2018-04-05
DE102013226579A1 (de) 2014-06-26
WO2014096142A1 (fr) 2014-06-26
AU2013360718A1 (en) 2015-07-09
JP2016500362A (ja) 2016-01-12
US20150299044A1 (en) 2015-10-22

Similar Documents

Publication Publication Date Title
DE3610041C2 (de) Keramik auf Zirkoniumdioxidbasis mit Aluminiumoxid, Spinell, Mullit oder Spinell und Mullit und mit verbesserter hydrothermaler und thermischer Stabilität
DE3876851T3 (de) Gesinterte keramische Aluminiumoxid-Zirkonoxid-Körper und Verfahren zur Herstellung derselben.
DE3813731C2 (de) Zusammensetzung mit Zirkoniumdioxid und Verfahren zu ihrer Herstellung
EP2819973B1 (fr) Procédé de fabrication d'un corps moulé fritté céramique composé d'oxyde de zircon stabilisé par y2o3
EP0406847B1 (fr) Matériau fritté à base d'oxyde d'aluminium, son procédé de production et son utilisation
EP1435346B1 (fr) Céramique pour fraiser préparée à partir de poudres d'oxydes avec une distribution granulométrique bimodale
DE3617115A1 (de) Verfahren zur herstellung von beta"-aluminiumoxid
DE102005033392A1 (de) Nanokristalline Sinterkörper auf Basis von Alpha-Aluminiumoxyd, Verfahren zu ihrer Herstellung sowie ihrer Verwendung
DE69303414T2 (de) Polykristalliner, lichtdurchlässiger Aluminiumoxidkörper und Verfahren zu seiner Herstellung
DE3633030A1 (de) Aluminiumoxid-titandioxid-compositpulver und verfahren zu ihrer herstellung
EP0209084A1 (fr) Procédé de préparation d'abrasifs polycristallins céramiques
EP2935151A1 (fr) Matériau céramique
DE112019002838T5 (de) Zinkoxidvaristor
DE3318168A1 (de) Optisch durchscheinende mullit-keramik
DE3902175A1 (de) Verfahren zur herstellung von ss"-aluminiumoxid
AT394850B (de) Gesintertes, mikrokristallines keramisches material
DE202016000055U1 (de) Zusammensetzung umfassend (eine) Calcium-Magnesium-Verbindung(en) als Presskörper
DE202014102701U1 (de) Produkt mit ausgerichteten Partikeln
DE102012200654B4 (de) Schlicker, Granulat und Keramik, Verfahren zu deren Herstellung und Verwendung
DE102005020781A1 (de) Zirkondioxid und Aluminiumoxid enthaltender Schlicker und daraus erhältlicher Formkörper
EP2473204B1 (fr) Matériau d'hydroxylapatite et son procédé de préparation
DE3853349T2 (de) Gesinterter Aluminiumoxidkörper von hoher Festigkeit und Verfahren zu seiner Herstellung.
EP2949633B1 (fr) Céramiques de Spinelle transparentes et leur procédé de fabrication
DE102009046036B4 (de) Verfahren zur Herstellung von redispergierbaren hochreinen Nanospinellpulvern und redispergierbares hochreines Nanospinellpulver
EP2726437A1 (fr) Mélange pour formation d'un matériau réfractaire, matériau réfractaire, procédé de fabrication d'un matériau réfractaire et utilisation d'une substance comme agent auxiliaire de frittage

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

17P Request for examination filed

Effective date: 20150720

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR

AX Request for extension of the european patent

Extension state: BA ME

DAX Request for extension of the european patent (deleted)
17Q First examination report despatched

Effective date: 20180308

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN

18D Application deemed to be withdrawn

Effective date: 20180719