EP1027306A1 - Procede de production de composants a partir de poudres - Google Patents

Procede de production de composants a partir de poudres

Info

Publication number
EP1027306A1
EP1027306A1 EP98949977A EP98949977A EP1027306A1 EP 1027306 A1 EP1027306 A1 EP 1027306A1 EP 98949977 A EP98949977 A EP 98949977A EP 98949977 A EP98949977 A EP 98949977A EP 1027306 A1 EP1027306 A1 EP 1027306A1
Authority
EP
European Patent Office
Prior art keywords
powder
binder
component
tool
mixture
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Withdrawn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
EP98949977A
Other languages
German (de)
English (en)
Inventor
Georg Veltl
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.)
Fraunhofer Gesellschaft zur Foerderung der Angewandten Forschung eV
Original Assignee
Fraunhofer Gesellschaft zur Foerderung der Angewandten Forschung eV
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
Priority claimed from DE19745283A external-priority patent/DE19745283C2/de
Application filed by Fraunhofer Gesellschaft zur Foerderung der Angewandten Forschung eV filed Critical Fraunhofer Gesellschaft zur Foerderung der Angewandten Forschung eV
Publication of EP1027306A1 publication Critical patent/EP1027306A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
    • C03B19/00—Other methods of shaping glass
    • C03B19/06—Other methods of shaping glass by sintering, e.g. by cold isostatic pressing of powders and subsequent sintering, by hot pressing of powders, by sintering slurries or dispersions not undergoing a liquid phase reaction
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
    • B22F3/02—Compacting only
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
    • B29B11/00—Making preforms
    • B29B11/06—Making preforms by moulding the material
    • B29B11/12—Compression moulding
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C43/00—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor
    • B29C43/006—Pressing and sintering powders, granules or fibres
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C67/00—Shaping techniques not covered by groups B29C39/00 - B29C65/00, B29C70/00 or B29C73/00
    • B29C67/02—Moulding by agglomerating
    • B29C67/04—Sintering
    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
    • B22F3/12—Both compacting and sintering
    • B22F3/14—Both compacting and sintering simultaneously
    • B22F2003/145—Both compacting and sintering simultaneously by warm compacting, below debindering temperature
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F2998/00—Supplementary information concerning processes or compositions relating to powder metallurgy
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C2791/00—Shaping characteristics in general
    • B29C2791/001—Shaping in several steps
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2503/00—Use of resin-bonded materials as filler

Definitions

  • the invention relates to a method for producing components from powdery starting materials, which can be aptly referred to as hot flow compaction.
  • a wide variety of powders are placed in a tool and pressed, so that the shape of the component is formed by the pressure.
  • a green body produced in this way is subsequently reduced, so that the bond between the powder is increased and the density and strength are increased accordingly.
  • the component in a simple form by pressing the powder used, as already mentioned, and then to form the desired contour or the bore by machining.
  • Another possibility is to bring the correspondingly simple components into the desired complex shape after the pressing by joining several such components (soldering, welding, gluing).
  • the respective undercuts are characterized only by a slight offset in the component, by using horizontally separated dies, to make the components demouldable. If the respective undercut to be produced has only a small groove in the component or a nose on the component, this can be demolded using an auxiliary stamp.
  • the undercuts must be small in relation to the component, since the powder movement during pressing transversely to the pressing direction always leads to cracks on the edges of the undercuts. For this purpose, the term “cross flow cracks 11 or the appearance of the cracks in English" has become dead. water-crack "naturalized.
  • a third possibility for producing undercuts and cross bores in such components is that known metal powder injection molding to use. Wax and polymer are added to the starting powder in an amount so that it can be processed using the methods known from plastic molding.
  • the metal powder injection molding process (MIM process), however, requires additional process steps, such as the necessary expulsion of the high binder content, since otherwise the component would melt again when heated to the sintering temperature or the high shrinkage of the component would occur during sintering (risk of warping) , so that only relatively large tolerances can be maintained in the dimensions of the components to be produced.
  • ther- moplastic properties of a temporary binder which is added to the starting powder, exploited.
  • the flowability of the powder starting material can also be improved to such an extent that, while avoiding the transverse flow cracks, material can also be transported in the mold designed for the components transversely to the pressing direction.
  • a relatively dense component is already obtained from the powdery starting material by pressing and a density of the component that is almost 100% of the theoretical density can be related to powder and binder and at least above
  • the procedure is such that such a high density is set in a powder pack that the properties of the starting powder are influenced by the addition of a small amount of a pressing aid (binder) in such a way that it exhibits a viscous behavior.
  • a pressing aid binder
  • the proportion of binder is selected so that the applied pressing pressure when the binder is heated and at least softened can cause the mixture of starting powder and binder to flow, but it is avoided that the inherent weight of parts of the green compact and its yield limit due to the binder content when heating to sintering temperature.
  • a certain one Proportion of fine powder can be added.
  • the fine portion of the powder can have the same consistency as the normal powder.
  • certain alloy fractions can also be contained in the fine fraction, which can specifically influence the achievable component properties.
  • the powder can then be mixed with the binder used.
  • the binder can be mixed with the powder as a mixture of a polymer and wax at a temperature at which the polymer has already softened and the wax has flowed.
  • the fine powder particles can be bound by the binder to the coarser powder particles and the coarser particles of the powder can be surrounded by a binder layer with fine powder particles.
  • the powder pretreated in this way is still easy to handle and free-flowing and is available as a composite powder.
  • This composite powder can be preheated to a temperature at which the binder softens again and then introduced into a heatable split tool which contains the shape of the component to be produced.
  • the composite powder can be preheated externally or in a heated tool.
  • the powder When a correspondingly high temperature is reached, at which the binder is at least softened, the powder is compressed in the tool with at least one press ram and pressure is exerted on the powder.
  • the powder is compacted, as is already known from the prior art in powder metallurgical processes, and when the powder is compacted by the stamp pressure to such an extent that the binder forms a continuous phase, a viscous flow begins. This viscous flow then further ensures that cavities in the tool, which are formed transversely to the pressing direction of the punch (s), are filled with the powder binder mixture. Areas that are in the slipstream of cores picked up in the tool can also be filled with sufficient density.
  • the green body prepared in this way can then be removed from the mold by opening a divided tool and sintered in a known manner, since the binder content is small, the flowability of the starting powder is improved, but prevents the weight of the parts from being sufficient during sintering in order to produce the prefabricated component let it flow and the components can be heated to the sintering temperature relatively quickly, regardless of the binder.
  • the added fine fraction of the starting powder increases the sintering activity and consequently the final density of the sintered finished components.
  • the increase in density is distributed over the shape during compression by pressing and through the shrinkage during sintering.
  • the starting powder is first packed loosely and the compression takes place mainly in the molding step during pressing.
  • the metal powder spraying process the density increase is only carried out during sintering and the shaping takes place almost without compression.
  • the different Various components can be manufactured by pressing in the most complex shapes, especially with undercuts, holes transverse to the pressing direction, as a through hole or blind holes.
  • the holes or blind holes can be created in the component without additional movable punches and simple cores can be used for this.
  • cores with applied threads can also be used, which can be screwed out of the green part, compact.
  • Such threaded bores can be aligned in the pressing direction and also transversely to the pressing direction and due to the flowability, the threads are also filled with the starting material.
  • Net-SHAPE threads can also be produced, but in each
  • the various relatively complex components can normally already be produced with an appropriately designed shape, without the need for additional movable or auxiliary stamps, and the stamps required solely for pressing are sufficient. It can be pressed with the punches acting in the same direction or counter to each other.
  • a better homogeneity of the density in the finished component can be achieved than is the case with the conventional method (eg die presses).
  • a proportion of fine powder can be added to the starting powder to increase the packing density and a proportion of fine powder between 5 and 40% by volume can be maintained. At least all powders that are smaller than the d 50 value of the starting powder fall under fine fraction.
  • a starting powder in which the particle size is distributed over a relatively large size range, has a similar effect, so that in addition to small, very fine particles, medium-sized particles, large particles are also present.
  • a wide variety of materials can be processed according to the invention as starting powder.
  • Components can be made from a wide variety of ceramic, plastic materials and glass.
  • the process is particularly suitable for processing metal powder.
  • metal powders e.g. Iron-based alloys with a grain size below 150 ⁇ m, to which a fine powder with a grain size below 25 ⁇ m, particularly advantageously below 10 ⁇ m, can advantageously be added.
  • the fine fraction should preferably be between 5 and 20% by volume, the rest being supplemented 100% with coarse powder.
  • Possible grain sizes for ceramic powder as the starting material are of the same order of magnitude, although the proportion of coarse grains in ceramics can also be somewhat larger.
  • the binder can then be added to the starting powder or the starting powder enriched with a fine fraction in a proportion of 0.5 to 4% by mass, these proportions preferably being used in metallic powders. For powders with a lower starting density, the proportion of binder compared to this range can be increased accordingly.
  • thermoplastic binder softens when a specific temperature for the binder is reached and, when heated up, takes up a greater volume fraction than it does at room temperature due to the thermal expansion which is thereby caused, this favoring the shaping at a higher processing temperature. Only so much binder should be used that the applied pressure can cause the powder-binder mixture to flow.
  • the upper part of the binder is limited by the fact that the yield strength of the green body during heating during sintering is not exceeded and the green body is not destroyed by the weight of parts during sintering.
  • binder compositions are: a) polyoxymethylene (POM) with approx. 4 mass% paraffin, b) polymethyl etacrylate (PMMA) with approx. 4 mass% paraffin, c) polypropylene (PP) with 2% paraffin and 2% stearic acid .
  • POM polyoxymethylene
  • PMMA polymethyl etacrylate
  • PP polypropylene
  • the actual shaping in the tool takes place at a temperature above room temperature at which the binder is soft or even liquid. In this case, heating is only necessary to the extent that the binder reaches the corresponding temperatures and the starting powder does not experience any changes in properties. It is obvious that the temperature range required for this, in particular in the case of starting powders made of metal, ceramic or glass, is far lower, since the softening or melting temperature of the binder is considerably lower.
  • the method according to the invention can be used for the production of components in a wide variety of complex forms. Examples of these are components with flanges or collars on the center, multi-speed sprockets, parts with cross holes, parts with offset holes, threaded holes, etc. Contours and in particular undercuts can be produced from powdery starting materials by pressing, as was impossible before the invention. Also for the first time, components could be manufactured using powder metallurgy with threads in such a process.
  • the process can also be used with other powders become. Powders that are available with a broad particle size distribution and in several particle sizes can be used.
  • Figure 1 shows an example of a tool that can be used in the inventive method
  • Figure 2 is a schematic representation of a correspondingly manufactured component
  • FIG. 3 shows a micrograph from the central region of the component shown in FIG. 2;
  • FIG. 4 shows a micrograph from an edge area of the component shown in FIG. 2;
  • FIG. 5 shows another example of a component produced according to the invention
  • FIG. 6 shows a micrograph of the component from a central component area
  • FIG. 7 shows a micrograph with a relief crack on the component shown in FIG. 5;
  • FIG. 8 shows a micrograph of the component according to FIG. 5 in an edge area
  • FIG. 9 shows the density distribution of the flow-compacted material in a component
  • Figure 10 is a photographic representation of such a component
  • FIG. 11 shows a component with undercuts of different widths
  • FIG. 12 shows a micrograph from a central area of the component shown in FIG. 11;
  • FIG. 13 shows a micrograph from an edge area of the component shown in Figure 11;
  • FIG. 14 shows a photographic illustration of a component with transverse bore produced according to the invention, and
  • FIG. 15 shows several micrographs of a thread formed in a component manufactured according to the invention.
  • components can be produced from a powdery starting material according to the method according to the invention.
  • the prepared powder-binder mixture is placed in the heatable tool 1 and, in this example, the heated mixture is pressed with two press rams 2 which can be moved in opposite directions. Further pistons 3 are formed in the tool 1, but in this case they are not moved, so that the mold to be produced has 4 undercuts, which are also filled with the powdery starting material which contains the corresponding binder fraction when compacted by flowing.
  • the two halves of the tool 1 are relatively rigidly connected to one another and the connection used, if at all, only slightly. yields elastically to avoid cracking when the two tool halves spring back.
  • the component shown in FIG. 2 was also produced with the tool 1 shown in FIG. 1, this component having undercuts of different dimensions, in particular on the right and left edge of the component, which are oriented transversely to the pressing direction of the press rams 2.
  • the component was manufactured from a metal powder with the trade name "Densmix” from Höganäs, which in itself has no cross flow properties. If this normal hot-pressed powder is used in a conventional manner, no compression can be achieved in the edge areas and the typical shear cracks occur at the deflection edges. These are actually shear cracks and not cracks that can result from the relief of the tool.
  • FIG. 3 and 4 show two micrographs of the T-shaped component according to FIG. 2, in an enlargement of 50: 1 from the central region of the component in FIG. 3 and the edge region in FIG. 4 in accordance with the local positions identified in FIG. 2 .
  • the density of the component in the edge regions is considerably lower than in the center of the component, which lies in the alignment of the press ram.
  • FIG. 5 shows a further cylindrical construction Part shown, the undercuts of 3 mm, 6 mm and 9 mm starting from the edge of the central cylinder.
  • the commercially available starting powder is available from Höganäs under the trade name "Distaloy AE".
  • 3% by mass of binder were added to this powder mixture of normal powder and the fine fraction and the whole was mixed. If necessary, preheating can be carried out so that the binder binds the fine powder to the coarser normal powder and achieves a coating with the binder.
  • FIGS. 6 to 8 show micrographs of the component produced in this way with an undercut of 9 mm, on the component marked B, C and D with a magnification of 50: 1, the component reaching a total density of 7.39 g / cm 3 .
  • a relief crack can also be seen at position C, ie at an edge of an undercut, which is caused by the relief of the
  • Tool 1 has occurred and is therefore not a tear as it was to be avoided according to the object of the invention.
  • the density distribution of a component can be seen schematically in FIG. 9, but this component was sintered at 1150 ° C.
  • the ratio of normal, relatively coarse to the fine fraction of the powder was changed and only 10% by volume of fine powder was added to the normal powder.
  • the micrographs shown in FIGS. 12 and 13 again come from positions that are made clear in FIG. 11. It was found that with this ratio of normal to fine powder, similarly good results could be achieved and no shear cracks occurred on the edges. If cracks have occurred, they are relief cracks that are caused by the tool structure and are caused by the elasticity of the connection of the two tool parts being too high.
  • Another corresponding component was made with a stainless steel powder mixture, in which 80% by volume of a relatively coarse powder (less than 150 ⁇ m) and 20% by volume of a fine powder (less than 22 ⁇ m) are used.
  • FIG. 14 shows a photographic representation of a component produced according to the invention with a transverse bore which is oriented transversely to the pressing direction.
  • the example shown shows a cross hole through a pullable
  • This transverse bore which is obtained without additional machining, can be located at almost any height of the component and thus very different deformations can be produced from above and below. It is clearly recognizable that a large part of the transverse bore is located in an area that is transverse to the actual pressing direction. Such training could not be achieved with the usual procedure and P. Beiss pointed out at the NNS conference and the Hagen Symposium, for example, that such cross holes can only be obtained in the neutral zone of such components, since in this area the deformation from the top and bottom is the same.
  • blind holes can also be produced in the same way, but they should preferably be in the neutral zone already mentioned, since otherwise the bending moments on the core to be used for this are too great.
  • FIG. 15 again shows various micrographs of a component with the thread. The threaded blind hole was pressed by one of the two press rams 2 in tool 1, as shown in FIG. 1.
  • Such a threaded component can again be produced with powder mixtures which have a fine fraction of 20 or 10% by volume, the remaining fraction being 100% coarse powder.
  • Binder proportions of a maximum of 4% by mass are sufficient to ensure sufficient flow of the powder material during the pressing process.
  • the blind holes already mentioned can also be produced without additional movable stamp segments which have been used for this purpose according to the prior art.
  • the mold 4 can be filled backwards in the tool 1 and a pin attached to the upper punch 2, which forms the shape of the blind hole, and during the pressing, the powdery starting material flows backwards and forms the blind hole with a uniform density of the material around the pin on the stamp 2. Whereby tests with pegs with a length of 8 mm were successfully carried out.
  • the shrinkage occurring during the subsequent sintering which is smaller than in the conventional method, must be taken into account in particular when dimensioning the shape 4 in the tool 1 and again particularly when dimensioning the cores. the metal powder injection molding.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Manufacturing & Machinery (AREA)
  • Mechanical Engineering (AREA)
  • Organic Chemistry (AREA)
  • Materials Engineering (AREA)
  • Dispersion Chemistry (AREA)
  • Ceramic Engineering (AREA)
  • Inorganic Chemistry (AREA)
  • Structural Engineering (AREA)
  • Powder Metallurgy (AREA)
  • Blow-Moulding Or Thermoforming Of Plastics Or The Like (AREA)
  • Compositions Of Oxide Ceramics (AREA)

Abstract

L'invention concerne un procédé de production de composants à partir de poudres, pouvant être désigné sous l'appellation de compactage par écoulement à chaud. L'invention vise à permettre la production de composants pouvant même être conçus de façon très complexe, par pressage à partir de matériaux de départ pulvérulents, tout en maintenant les coûts de production à un niveau bas, et en évitant les fissures dues à des écoulements transversaux. A cet effet, il est prévu une poudre à laquelle on ajoute un liant thermoplastique ou un mélange de liants dans une proportion telle que la masse intrinsèque d'une ébauche ne dépasse pas sa limite d'écoulement pendant la montée en température lors du frittage. Le mélange pulvérulent est incorporé dans un outil chauffé présentant la forme du composant à produire, et la température est fixée au-dessus de la température de ramollissement du liant. Ensuite, le mélange pulvérulent est pressé, au moins d'un côté au moyen d'un poinçon et il est également incorporé dans des zones transversales à la direction de pressage, par écoulement visqueux. L'ébauche ainsi obtenue est ensuite frittée.
EP98949977A 1997-08-29 1998-08-27 Procede de production de composants a partir de poudres Withdrawn EP1027306A1 (fr)

Applications Claiming Priority (5)

Application Number Priority Date Filing Date Title
DE19737866 1997-08-29
DE19737866 1997-08-29
DE19745283A DE19745283C2 (de) 1997-10-15 1997-10-15 Verfahren zur Herstellung von Bauteilen aus Pulvern
DE19745283 1997-10-15
PCT/EP1998/005450 WO1999011584A1 (fr) 1997-08-29 1998-08-27 Procede de production de composants a partir de poudres

Publications (1)

Publication Number Publication Date
EP1027306A1 true EP1027306A1 (fr) 2000-08-16

Family

ID=26039566

Family Applications (1)

Application Number Title Priority Date Filing Date
EP98949977A Withdrawn EP1027306A1 (fr) 1997-08-29 1998-08-27 Procede de production de composants a partir de poudres

Country Status (3)

Country Link
EP (1) EP1027306A1 (fr)
JP (1) JP2001514153A (fr)
WO (1) WO1999011584A1 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20070154666A1 (en) * 2005-12-31 2007-07-05 Coonan Everett W Powder injection molding of glass and glass-ceramics
CN113582517B (zh) * 2021-09-01 2022-12-20 Oppo广东移动通信有限公司 玻璃注塑胚体的烧结工艺、玻璃制品的加工方法及玻璃制品

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1533035B1 (de) * 1965-06-17 1971-04-01 Tavkoezlesi Ki Verfahren zur pulvermetallurgischen herstellung von sinter teilen aus metall und oder metalloxidpulver mittels pasten guss
US4233256A (en) * 1978-12-18 1980-11-11 The Carborundum Company Process for injection molding sinterable carbide ceramic materials
EP0400778B1 (fr) * 1989-05-30 1994-11-02 Corning Incorporated Liants en gel de polymère réversibles pour la formation de poudres
US5332543A (en) * 1992-08-26 1994-07-26 Advanced Materials Technologies Pte Ltd Method for producing articles from particulate materials using a binder derived from an idealized TGA curve

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO9911584A1 *

Also Published As

Publication number Publication date
JP2001514153A (ja) 2001-09-11
WO1999011584A1 (fr) 1999-03-11

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