WO2010140868A2 - Poudre de titanate de baryum revêtue d'une couche d'oxyde et procédé de production associé - Google Patents

Poudre de titanate de baryum revêtue d'une couche d'oxyde et procédé de production associé Download PDF

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WO2010140868A2
WO2010140868A2 PCT/KR2010/003613 KR2010003613W WO2010140868A2 WO 2010140868 A2 WO2010140868 A2 WO 2010140868A2 KR 2010003613 W KR2010003613 W KR 2010003613W WO 2010140868 A2 WO2010140868 A2 WO 2010140868A2
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barium titanate
titanate powder
oxide layer
coated
slurry
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Korean (ko)
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WO2010140868A3 (fr
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장길완
임광수
최병기
이진형
손용호
윤대호
마사키다카키
허만규
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CQV Co Ltd
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Publication of WO2010140868A2 publication Critical patent/WO2010140868A2/fr
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    • H—ELECTRICITY
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    • H01G4/00—Fixed capacitors; Processes of their manufacture
    • H01G4/002—Details
    • H01G4/018—Dielectrics
    • H01G4/06—Solid dielectrics
    • H01G4/08—Inorganic dielectrics
    • H01G4/12—Ceramic dielectrics
    • H01G4/1209—Ceramic dielectrics characterised by the ceramic dielectric material
    • H01G4/1218—Ceramic dielectrics characterised by the ceramic dielectric material based on titanium oxides or titanates
    • H01G4/1227—Ceramic dielectrics characterised by the ceramic dielectric material based on titanium oxides or titanates based on alkaline earth titanates
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    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
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    • H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE
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    • C01P2004/84—Particles consisting of a mixture of two or more inorganic phases two phases having the same anion, e.g. both oxidic phases one phase coated with the other
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    • 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
    • C04B2235/3231—Refractory metal oxides, their mixed metal oxides, or oxide-forming salts thereof
    • C04B2235/3232—Titanium oxides or titanates, e.g. rutile or anatase
    • C04B2235/3234—Titanates, not containing zirconia

Definitions

  • the present invention provides a ceramic raw material powder having an oxide layer composed of a minor ingredient additive on the surface of particles of a main ingredient raw material powder composed of barium titanate (BaTiO 3 ) (hereinafter referred to as 'main ingredient particles'), and the raw material powder.
  • the present invention relates to a method of manufacturing a ceramic raw material powder which can be easily manufactured when forming a dielectric ceramic composition such as a dielectric layer of a multilayer ceramic capacitor (MLCC).
  • MLCC multilayer ceramic capacitor
  • Multilayer Ceramic Capacitors are widely used as small, large-capacity, high-reliability electronic components, and many types and quantities are used in one electronic device.
  • a multilayer ceramic capacitor is usually produced by laminating and baking a paste for an internal electrode layer and a paste for a dielectric layer by using a sheet method or a printing method.
  • the conductive material of the internal electrode layer As the conductive material of the internal electrode layer, a relatively inexpensive base metal such as Ni or Ni alloy is used. In the case of using a nonmetal as the conductive material for the internal electrode layer, since the internal electrode layer oxidizes when firing in the air, it is necessary to perform simultaneous firing of the dielectric layer and the internal electrode layer in a reducing atmosphere. However, when firing in a reducing atmosphere, the dielectric layer is reduced and the specific resistance is lowered. Therefore, a non-reducing dielectric material has been proposed.
  • X7R characteristics As a non-reducing dielectric material, X7R characteristics (currently defined by EIAJ (Japan Electromechanical Association)) (with a capacitance change rate of less than ⁇ 15% based on 25 ° C in a temperature range of -55 ° C to 125 ° C), or It is mainstream that the temperature stability of the electrostatic capacity which satisfies the B characteristic prescribed
  • This problem is a cause of serious defects in the dielectric constant and insulation resistance of the multilayer ceramic capacitor, characteristics related to load life, quality and reliability. For this reason, in order to ensure the characteristic, quality, and reliability of the above-mentioned ceramic electronic components, uniform dispersion of the main component BaTiO 3 and the subcomponent additives is indispensable.
  • the temperature stability of the capacitance that satisfies both the X7R characteristics defined by the EIAJ standard and the B characteristics specified by the JIS standard is satisfactory, the characteristics such as insulation resistance value and relative dielectric constant are good, and the accelerated life of the insulation resistance is good.
  • a main raw material used to obtain an electronic product such as a long laminated ceramic capacitor (MLCC)
  • additives capable of exerting the above functions are formed on the surface of the metal oxide coated layer. It is an object of the present invention to provide a barium titanate powder coated with a metal oxide capable of improving dispersibility and a method of manufacturing the same.
  • Barium titanate powder according to the present invention is an oxide layer formed by uniformly dispersing at least one material selected from Si, Y, V, Dy, Mg, Mn, Ni, Co and Zr on the surface of the barium titanate (BaTiO 3 ) particles 1 It is characterized by being coated over a layer.
  • the particle radius (r) of the barium titanate particles is characterized in that 40 to 400nm
  • the oxide layer is characterized in that consisting of 0.01 to 15% by weight relative to the weight of the barium titanate particles
  • the oxide layer is characterized in that 0.01 ⁇ 30nm
  • the oxide layer is characterized in that formed by hydrothermal hydrolysis reaction.
  • the barium titanate powder according to an embodiment of the present invention is characterized in that the SiO 2 layer is coated on the surface of the barium titanate (BaTiO 3 ) particles.
  • an oxide layer formed by uniformly dispersing one or more materials selected from Y, V, Dy, Mg, Mn, Ni, Co, and Zr is further coated on the SiO 2 layer.
  • the SiO 2 layer and the oxide layer are each formed by hydrothermal hydrolysis.
  • the multilayer ceramic capacitor (MLCC) according to the present invention is characterized in that the barium titanate powder described above.
  • the method for producing a barium titanate powder coated with an oxide layer comprises the steps of adding a barium titanate powder to a reactor containing water and stirring to form a first slurry, and the Si, Y, Titrating a diluent in which a compound composed of at least one selected from V, Dy, Mg, Mn, Ni, Co, and Zr is dissolved to form a second slurry, and dehydrating (concentrating) and washing the second slurry. And removing the foreign matter and heat-treating the remaining solids.
  • the first slurry is characterized in that it further comprises the step of heating to 70 ⁇ 90 °C, pH of the second slurry when titrating a diluent in which the oxide composed of Si in the second slurry is titrated Is maintained at 5.0 to 14.0, and the diluent in which the oxide made of Si is dissolved is used as water glass, and Si, Y, V, Dy, Mg, and Mn are used in the second slurry.
  • the titration of the second slurry is maintained at 5.0 to 14.0 when titrating a dilution solution of an oxide composed of at least one selected from Ni, Co, and Zr, wherein the Y, V, Dy,
  • the diluent in which an oxide composed of at least one material selected from Mg, Mn, Ni, Co, and Zr is dissolved is used as an aqueous solution composed of one selected from chloride, nitrate and sulfate.
  • the pH is maintained by using one selected from HCl, H 2 SO 4 , HNO 3 , NaOH and KOH, and further comprising the step of stirring for 10 to 60 minutes after the composition of the second slurry Characterized in that, the heat treatment step comprises the step of maintaining for 20 to 120 minutes at a temperature of 125 ⁇ 1300 °C, the thickness of the oxide layer is Si, Y, V, Dy, Mg, Mn It is characterized by determining by adjusting the addition amount of Ni, Co and Zr compounds.
  • the method for manufacturing a multilayer ceramic capacitor raw material is performed by dispersing an oxide layer-coated barium titanate powder in water as an internal electrode layer paste or a dielectric layer paste. It is characterized by forming.
  • the present invention is to prepare a barium titanate powder composed of an oxide layer (Si, Y, V, Dy, Mg, Mn, Ni, Co and Zr) oxide layer on the surface of the barium titanate (BaTiO 3 ) particles of the main component, the secondary component oxide
  • the thickness of the layer within the range of 0.01 to 30 nm, it satisfies both the X7R characteristic defined by the EIAJ standard and the B characteristic defined by the JIS standard, the temperature stability of the capacitance is good, and characteristics such as insulation resistance value and relative dielectric constant. This provides an effect of making it possible to manufacture a raw material for an electronic component having a good and long life of accelerated insulation resistance.
  • the barium titanate powder coated with the oxide layer to easily form an electronic material such as a multilayer ceramic capacitor (MLCC), it provides an effect of improving the production efficiency and cost.
  • MLCC multilayer ceramic capacitor
  • FIG. 1 is a cross-sectional view schematically showing a barium titanate powder coated with an oxide layer according to the present invention.
  • FIG. 2 is a TEM photograph showing a barium titanate powder coated with an oxide layer according to the present invention.
  • FIG. 3 is a TEM photograph showing an enlarged surface of an oxide layer-coated barium titanate powder according to the present invention.
  • FIG. 5 is a graph illustrating the line scan results of FIG. 4.
  • FIG. 6 is a TEM photograph showing a barium titanate powder coated with a Dy 2 O 3 metal oxide layer according to the present invention.
  • FIG. 7 is a graph illustrating the line scan results of FIG. 6.
  • FIG. 10 is a TEM photograph showing a barium titanate powder coated with an SiO 2 and Dy 2 O 3 oxide layer according to the present invention.
  • FIG. 11 is a graph illustrating a line scan result of FIG. 10.
  • FIG. 12 is a TEM photograph showing a barium titanate powder coated with an SiO 2 and Y 2 O 3 oxide layer according to the present invention.
  • FIG. 13 is a graph illustrating a line scan result of FIG. 12.
  • 16 and 17 are E-SEM photographs showing the results of heat treatment on SiO 2 coated barium titanate powder according to an embodiment of the present invention.
  • 22 and 23 are E-SEM photographs showing the results of heat treatment on the MgO-coated barium titanate powder according to an embodiment of the present invention.
  • a coating layer made of subcomponent elements is formed on the surface of each ceramic main component particle, and the subcomponent elements are also homogeneously distributed so as to form a coating layer.
  • a liquid solution containing the sub ingredient additive is precipitated in the main ingredient powder, and a liquid method is used so that the sub ingredient is directly and uniformly coated on the surface of the main ingredient.
  • an oxide layer composed of subsidiary additives is coated on the surface of a main component particle composed of barium titanate.
  • FIG. 1 is a cross-sectional view schematically showing a barium titanate powder coated with an oxide layer according to the present invention.
  • the average radius of the barium titanate (BaTiO 3 ) particles 100 as the main component particles constituting the ceramic raw material powder is r.
  • r is set to 40 to 400 nm, and ⁇ r is controlled within a range of 0.01 to 30 nm. At this time, more preferably, r is formed in the range of 50 to 200 nm, and ⁇ r is preferably formed in the range of 0.1 to 10 nm.
  • the thickness of the oxide layer 110 when the thickness of the oxide layer 110 is formed to be less than 0.01 nm, the dispersion characteristics may be degraded.
  • the thickness of the oxide layer 110 is formed to be greater than 30 nm, the temperature stability is good, and the characteristics such as insulation resistance and relative dielectric constant decrease. As such, it is desirable to comply with the scope provided by the present invention.
  • the coating amount of the oxide layer 110 is preferably in the range of 0.01 to 15% by weight relative to the barium titanate particles. Most suitably 0.05 to 5% by weight is preferred. When the coating amount is added in less than 0.01% by weight, the oxide layer 110 of the desired thickness cannot be obtained. When the coating amount is more than 15% by weight, the thickness of the oxide layer 110 may be non-uniformly provided. It is desirable to comply with the range.
  • FIG. 2 is a TEM photograph showing a barium titanate powder coated with an oxide layer according to the present invention.
  • barium titanate powders are shown, and when one of the barium titanate particles is examined, an oxide layer is transparently formed on the outside.
  • FIG. 3 is a TEM photograph showing an enlarged surface of an oxide layer-coated barium titanate powder according to the present invention.
  • an SiO 2 layer is formed as an oxide layer on the surface of one barium titanate (BaTiO 3 ) particles included in the barium titanate powder.
  • the barium titanate powder as described above has a process of coating the main component particles in a hydroxide state, a process of dehydrating, washing with water, and heat treating the solution, and having a process of forming a hydroxide into an oxide layer in the form of a solid by heat treatment.
  • the dielectric properties of the barium titanate powder is adjusted.
  • At least one selected from Si, Dy, Y, Mg, V, Mn, Ni, Co and Zr is dispersed on the surface of the barium titanate to form an oxide layer.
  • an oxide layer By forming such an oxide layer, it is possible to compensate the barium titanate, which has been miniaturized and whose dispersion characteristics are reduced.
  • additives that can improve temperature stability, insulation resistance, relative dielectric constant, accelerated life of insulation resistance, and the like as subcomponent elements, depending on the dispersion state of barium titanate particles, Their dispersion characteristics can also be adjusted.
  • SiO 2 is formed on the surface of the barium titanate particles as a first layer, and a coating for laminating at least one metal oxide selected from Dy, Y, Mg, V, Mn, Ni, Co, and Zr materials
  • a method may be used, and as another embodiment, a method of mixing 2 to 8 materials to form an oxide and coating the same may be used.
  • the total thickness of the oxide layer is 0.01 to 30 nm. It is desirable to.
  • Si may be used as Water Glass
  • Dy is DyCl 3 , Dy (NO 3 ) 3 and Dy 2 (SO 4 ) 3
  • Y is YCl 3 and Y ( NO 3 ) 3
  • Mg is MgCl 2 , Mg (NO 3 ) 2 and Mg (SO 4 )
  • V is VO (SO 4 ) and VOCl 2
  • Mn is MnCl 2 , Mn (NO 3 ) 2 and Mn (SO 4)
  • Ni is NiCl 2 , Ni (NO 3 ) 2 and Ni (SO 4 )
  • Co is CoCl 2 , Co (NO 3 ) 2 and Co (SO 4 )
  • Zr is ZrCl 2 , Zr (NO 3 ) 2 and Zr (SO 4 ) can be used.
  • Si sodium silicate
  • Dy is DyCl 3
  • Y is YCl 3
  • Mg is MgCl 2
  • V is VO (SO 4 )
  • Ni NiCl 2
  • Co Co (SO 4 )
  • Zr is easy to use ZrCl 2 .
  • pH adjusting solutions include HCl, H 2 SO 4 , H (NO 3 ) 3 as acidic solutions, and NaOH and KOH as alkaline solutions.
  • the oxide-coated barium titanate powder according to the present invention and a manufacturing method thereof are made of compositions of Si, Dy, Y, Mg, V, Mn, Ni, Co, and Zr on the surface of spherical barium titanate particles.
  • the coating layer on which the oxide layer is formed and various methods for improving the physical properties of the dielectric are presented.
  • the present invention is different from the conventional method of coating using a hydrothermal hydrolysis method, unlike the dry and wet mixing (mixing) method, it is possible to apply a uniform surface and to stack or simultaneously coat several different metal oxides in multiple layers. It is a new technology.
  • the oxide layer-coated barium titanate powder is easy to be used to make an ultra-small, high capacity, high efficiency multilayer ceramic capacitor (MLCC).
  • MLCC multilayer ceramic capacitor
  • the aqueous solution of sodium hydroxide was added to raise the pH of the slurry to 5.0 to 10.0, and 100 g of sodium silicon solution (5.0% of SiO 2 content) was weighed and then fixed over about 1 hour. Titrate at speed. At this time, pH 5.0 to 10.0 is kept constant with a dilution solution of 10 to 30% HCl.
  • the reason for keeping the pH constant is that the reaction is fine and uniformly well at a specific temperature and pH range.
  • the oxide layer may be non-uniform, and if titration slowly, there is no difference in the reaction, but workability is poor.
  • [Formula 1] shows the reaction that the pH is adjusted as HCl is added.
  • Forma 2 shows a process in which the hydroxide is formed as an oxide layer of the solid form by the heat treatment.
  • calcination was performed at a temperature increase rate of 200 ° C./hour, a holding temperature of 650 ° C., a holding time of 30 minutes, a temperature reduction time of 150 ° C./hour, and a treatment atmosphere.
  • the pH is kept constant with 10-50% sodium hydroxide solution.
  • the oxide layer may be non-uniform, and if titration slowly, there is no difference in the reaction, but workability is poor.
  • ZrO 2 -coated barium titanate powder was synthesized by treating the slurry in which titration was completed in the same manner as in Example 1.
  • [Formula 4] shows a process in which the hydroxide is formed as an oxide layer of the solid form by the heat treatment.
  • the pH is kept constant with 10-50% sodium hydroxide solution.
  • the oxide layer may be non-uniform, and if titration slowly, there is no difference in the reaction, but workability is poor.
  • DyCl 3 solution is titrated rather than the basis weight after the YCl 3 solution (YCl 3 50.0g / L) 100g .
  • the pH was kept constant with 10-50% sodium hydroxide solution. After titration, the mixture is stirred for 30 minutes to reflux.
  • Example 2 the slurry was treated in the same manner as in Example 1 to synthesize a barium titanate powder coated with V 2 O 5 .
  • NiCl 2 solution instead of DyCl 3 solution after the same treatment as in Example 2 (NiCl 2 50.0 g / L)
  • Example 2 the slurry was treated in the same manner as in Example 1 to synthesize a barium titanate powder coated with NiO.
  • Example 2 the slurry was treated in the same manner as in Example 1 to synthesize a barium titanate powder coated with CoO.
  • the coated SiO 2 may be eluted, so it is slowly increased at a constant rate.
  • ZrCl 2 solution 100 g of ZrCl 2 solution (ZrCl 2 50.0 g / L) is titrated in basis weight. During this titration, the pH is kept constant with 10-50% sodium hydroxide solution.
  • Example 2 the slurry was treated in the same manner as in Example 1 to synthesize a barium titanate powder coated with SiO 2 and ZrO 2 .
  • the coated SiO 2 may be eluted, so it is slowly increased at a constant rate.
  • Example 2 the slurry was treated in the same manner as in Example 1 to synthesize a barium titanate powder coated with SiO 2 and Dy 2 O 3 .
  • Example 11 and treated in the same manner and, DyCl 3 solution is titrated rather than the basis weight after the YCl 3 solution (YCl 3 50.0g / L) 100g . During this titration, the pH is kept constant with 10-50% sodium hydroxide solution.
  • Example 2 the slurry was treated in the same manner as in Example 1 to synthesize a barium titanate powder coated with SiO 2 and Y 2 O 3 .
  • Example 11 The same treatment as in Example 11 was carried out, followed by titration of 100 g of MgCl 2 solution (MgCl 2 50.0 g / L) instead of DyCl 3 solution. During this titration, the pH is kept constant with 10-50% sodium hydroxide solution.
  • Example 2 the slurry was treated in the same manner as in Example 1 to synthesize a barium titanate powder coated with SiO 2 and MgO.
  • Example 11 The same treatment as in Example 11 was carried out after the basis weight of 100 g of VO (SO 4 ) solution (VO (SO 4 ) 50.0 g / L) instead of DyCl 3 solution. During this titration, the pH is kept constant with 10-50% sodium hydroxide solution.
  • Example 2 the slurry was treated in the same manner as in Example 1 to synthesize barium titanate powder coated with SiO 2 and V 2 O 5 .
  • Example 11 The same treatment as in Example 11 was carried out, followed by titration of 100 g of NiCl 2 solution (NiCl 2 50.0 g / L) instead of DyCl 3 solution. During this titration, the pH is kept constant with 10-50% sodium hydroxide solution.
  • Example 2 the slurry was treated in the same manner as in Example 1 to synthesize a barium titanate powder coated with SiO 2 and NiO 2 .
  • Example 11 The same treatment as in Example 11 was carried out after the basis weight of 100 g of MnCl 2 solution (NiCl 2 50.0 g / L) instead of the DyCl 3 solution. During this titration, the pH is kept constant with 10-50% sodium hydroxide solution.
  • Example 2 the slurry was treated in the same manner as in Example 1 to synthesize barium titanate powder coated with SiO 2 and MnO 2 .
  • Example 11 The same treatment as in Example 11 was carried out after the basis weight of 100 g of Co (SO 4 ) solution (Co (SO 4 ) 50.0 g / L) instead of DyCl 3 solution. During this titration, the pH is kept constant with 10-50% sodium hydroxide solution.
  • ZrCl 2 solution (ZrCl 2 50.0 g / L), which is the treatment method of Example 2, is weighed and titrated at a constant rate over 1 hour. During this titration, the pH is kept constant with 10-50% sodium hydroxide solution.
  • Example 2 the slurry was treated in the same manner as in Example 1 to synthesize a barium titanate powder coated with ZrO 2 and SiO 2 .
  • Example 2 After the same treatment as in Example 2, the pH was raised to 6.0 to 12.0 with an aqueous sodium hydroxide solution, followed by stirring for 30 minutes to reflux.
  • Example 2 the slurry was treated in the same manner as in Example 1 to synthesize barium titanate powder sequentially coated with ZrO, Dy 2 O 3 , Y 2 O 3 , MgO, V 2 O 5 , MnO, NiO, and CoO. .
  • Example 2 After the same treatment as in Example 2, the pH was raised to 6.0 to 12.0 with an aqueous sodium hydroxide solution, followed by stirring for 30 minutes to reflux.
  • the slurry was treated in the same manner as in Example 1 to synthesize barium titanate powder coated with ZrO, Dy 2 O 3 , Y 2 O 3 , MgO, V 2 O 5 , MnO, NiO, and CoO.
  • the rest may be mixed to form a coating layer.
  • Example 18 After the same treatment as in Example 18, the pH was raised to 6.0-12.0 with an aqueous sodium hydroxide solution, followed by stirring for 30 minutes to reflux.
  • Example 2 the slurry was treated in the same manner as in Example 1 to synthesize barium titanate powder coated with ZrO, SiO 2 , Dy 2 O 3 , Y 2 O 3 , MgO, V 2 O 5 , MnO, NiO, and CoO. It was. At this time, ZrO, SiO 2 is first coated, and then the remaining materials are sequentially coated.
  • Example 18 After the same treatment as in Example 18, the pH was raised to 6.0-12.0 with an aqueous sodium hydroxide solution, followed by stirring for 30 minutes to reflux.
  • the slurry was treated in the same manner as in Example 1 to synthesize barium titanate powder coated with ZrO, SiO 2 , Dy 2 O 3 , Y 2 O 3 , MgO, V 2 O 5 , MnO, NiO, and CoO. It was. At this time, ZrO, SiO 2 may be coated first, and then the remainder may be mixed to form a coating layer.
  • the barium titanate powder coated with the oxide layer according to the present invention includes various embodiments that can improve the physical properties of the dielectric.
  • the oxide layer according to the present invention is uniformly formed by hydrothermal hydrolysis, thereby further improving the dispersibility of the barium titanate powder.
  • FIG. 4 is a TEM photograph showing a barium titanate powder coated with SiO 2 according to the present invention
  • FIG. 5 is a graph showing the line scan result of FIG. 4.
  • FIG. 6 is a TEM photograph showing a barium titanate powder coated with a Dy 2 O 3 metal oxide layer according to the present invention
  • FIG. 7 is a graph showing the line scan result of FIG. 6.
  • FIG. 6 a barium titanate powder coated with a single layer of Dy 2 O 3 metal oxide layer is shown, and FIG. 7 shows a distribution of Dy while scanning along a cross section of barium titanate particles of one of the powders. Referring to FIG. 7, it can be seen that Dy is evenly distributed.
  • FIG. 8 illustrates the number of Dy detected at one point of the cross section of FIG. 7, and FIG. 9 illustrates the number of Dy detected at two points. It can be seen that the detection result is uniformly shown as shown.
  • FIG. 10 is a TEM photograph showing a barium titanate powder coated with SiO 2 and Dy 2 O 3 oxide layers according to the present invention
  • FIG. 11 is a graph showing the line scan results of FIG. 10.
  • FIG. 10 SiO 2 , Dy 2 O 3 A barium titanate powder coated with a double layer of a metal oxide layer is shown, and FIG. 11 shows a distribution of Dy and Si while scanning along a cross section of barium titanate particles of one of the powders.
  • FIG. 12 is a TEM photograph showing a barium titanate powder coated with an SiO 2 and Y 2 O 3 oxide layer according to the present invention
  • FIG. 13 is a graph showing the line scan result of FIG. 12.
  • FIG. 12 a barium titanate powder coated with a double layer of SiO 2 and Y 2 O 3 oxide layers is shown, and FIG. 13 shows a distribution of Y and Si while scanning along a cross section of barium titanate particles of one of the powders.
  • Y and Si are evenly distributed.
  • Figure 15 is a photograph taken after the heat treatment of the barium titanate powder in the form of a bulk without an oxide layer for 30 minutes at a temperature of 125 °C
  • Figure 15 is a photograph taken after the heat treatment for 30 minutes at a temperature of 1250 °C.
  • the boundary between particles is distinct and has a regular distribution.
  • FIG. 16 and 17 show the results of heat treatment on SiO 2 coated barium titanate powder according to an embodiment of the present invention
  • Figures 18 and 19 is a titanic acid coated Dy 2 O 3 according to an embodiment of the present invention
  • FIG. 20 and FIG. 21 show the results of the heat treatment on the barium titanate powder coated with Y 2 O 3 according to the embodiment of the present invention
  • FIGS. 22 and 23 show the results of the heat treatment on the barium powder.
  • Eg shows the results of the heat treatment to the MgO-coated barium titanate powder
  • Figures 24 and 25 is a heat treatment to the V 2 O 5 -coated barium titanate powder according to an embodiment of the present invention SEM pictures.
  • the barium titanate powder according to the present invention has a uniform oxide coating layer, and thus the powder distribution can be uniform.
  • the powders of the uniform particles are also improved in properties such as temperature stability, insulation resistance, relative dielectric constant and accelerated life of the insulation resistance in proportion to the uniformity.
  • a paste for internal electrode layers or a paste for dielectric layers used to make an ultra-small, high-capacity, high-efficiency multilayer ceramic capacitor (MLCC) can be obtained. It can be formed easily.
  • the present invention can be utilized in manufacturing a more versatile and highly efficient multilayer ceramic capacitor (MLCC).
  • MLCC multilayer ceramic capacitor

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Abstract

La présente invention a trait à une poudre de titanate de baryum revêtue d'une couche d'oxyde et à un procédé de production associé. L'invention a également trait à une invention permettant de produire de la poudre de titanate de baryum qui est constituée d'une couche d'oxyde, constituant un composant auxiliaire, sur la surface d'une particule de titanate de baryum constituant le composant principal, et de contrôler l'épaisseur de la couche d'oxyde constituant le composant auxiliaire de manière à ce qu'elle soit comprise entre 0,01 et 30 nm, afin de produire une matière première pour des produits électroniques qui satisfait à la fois les caractéristiques X7R stipulées dans les normes EIAJ et les caractéristiques B stipulées dans les normes JIS, qui a une bonne stabilité de température de capacité, de bonnes caractéristiques, y compris une valeur de résistance d'isolement et une permittivité relative, et dont la durée de vie accélérée de la résistance d'isolement est longue.
PCT/KR2010/003613 2009-06-05 2010-06-04 Poudre de titanate de baryum revêtue d'une couche d'oxyde et procédé de production associé Ceased WO2010140868A2 (fr)

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