Porous tantalite ceramic and preparation method thereof

A technology of tantalate and ceramics, which is applied in the field of porous tantalate ceramics and its preparation, can solve the problems of high thermal conductivity and achieve good heat insulation effect

Active Publication Date: 2019-07-12
陕西天璇涂层科技有限公司
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Problems solved by technology

[0005] The invention provides a porous tantalate ceramic and its preparation method to solve the problem that the existing ceramic preparation method has a large number of defects inside the ceramic material and makes its thermal conductivity high

Method used

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  • Porous tantalite ceramic and preparation method thereof
  • Porous tantalite ceramic and preparation method thereof
  • Porous tantalite ceramic and preparation method thereof

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preparation example Construction

[0047] The preparation method of the above-mentioned porous tantalate ceramics comprises the following steps:

[0048] Step (1): Weigh RE with a molar ratio of RE:Ta:Hf of 1:1:x (02 o 3 Powder, Ta 2 o 5 Powder and HfO 2 Powder, add solvent distilled water or ethanol to mix, the above three powders (RE 2 o 3 Powder, Ta 2 o 5 Powder and HfO 2 The molar ratio of powder) to solvent is (3:1)~(5:1), and the grinder is used for grinding, and the powder A is obtained after drying; the grinder adopts a vertical laboratory sand mill, the model is WT0.3 , the grinding time is 24~48h, the speed of the grinder is 2000~3000r / min, and the raw material RE 2 o 3 Powder, Ta 2 o 5 Powder and HfO 2 The purity of the powder is not less than 99.9%.

[0049] Step (2): Dry the powder obtained in step (1) and sieve it for the first time to obtain powder B, wherein the drying temperature is 50-90°C, the drying time is 12-16 hours, and the mesh size of the first sieve is 100-300 mesh.

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Abstract

The invention relates to the technical field of thermal barrier coatings, in particular to a porous tantalite ceramic. The ceramic is prepared by sintering RE2O3 powder, Ta2O5 powder and HfO2 powder,the molar ratio of RE: Ta: Hf in the ceramic is 1:1: x, wherein the x is larger than 0 and smaller than 0.1; the ceramic is of a porous structure, and the porosity is larger than 0.2. The preparationmethod of the ceramic comprises the following steps of: weighing the RE2O3 powder, the Ta2O5 powder and the HfO2 powder, wherein the molar ratio of RE: Ta: Hf is 1:1:x, adding a solvent, mixing, and grinding by using a grinding machine to obtain powder A; drying the powder A, and sieving for the first time to obtain powder B; placing the powder B in a mold, compacting, and pre-sintering to obtaina block C; cooling the block C to room temperature, grinding by using the grinding machine, and sieving for the second time to obtain powder D; and sintering the powder D to obtain the porous tantalite ceramic. The porous tantalite ceramic prepared by adopting the technical scheme has the advantages of high porosity, low thermal conductivity at high temperature and good heat insulation performance.

Description

technical field [0001] The invention relates to the technical field of thermal barrier coatings, in particular to porous tantalate ceramics and a preparation method thereof. Background technique [0002] Thermal barrier coatings are mainly used in the aero-engine industry, mainly to insulate heat, reduce the thermal mismatch between the coating and the alloy matrix, and effectively resist particle impact to protect components in high-temperature areas of aero-engines. It is required to have good thermodynamics properties, such as low thermal conductivity, high coefficient of thermal expansion, and high temperature stability. [0003] Currently widely used thermal barrier coatings mainly include yttria stabilized zirconia (YSZ) and rare earth zirconates (RE). 2 Zr 2 o 7 ), etc., but there are certain deficiencies: YSZ has a low operating temperature (≦1200°C), and its thermal conductivity is relatively high; while rare earth zirconates have a problem of low thermal expansi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/495C04B35/622C04B38/00
CPCC04B35/495C04B35/622C04B38/00C04B2235/3224C04B2235/3244C04B2235/3253
Inventor 冯晶种晓宇
Owner 陕西天璇涂层科技有限公司
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