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Rare earth ytterbium tantalite ceramic resisting corrosion of low-melting-point oxides and preparation method of rare earth ytterbium tantalite

An oxide and low melting point technology, applied in the direction of mechanical equipment, blade support components, machines/engines, etc., can solve problems such as thermal barrier coating cracking, achieve the effects of reduced micro-cracks, low porosity, and improved corrosion performance

Inactive Publication Date: 2019-07-12
KUNMING UNIV OF SCI & TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The invention provides a rare earth ytterbium tantalate ceramics resistant to corrosion by low-melting point oxides and a preparation method thereof, so as to solve the problem that existing thermal barrier coatings are prone to cracking in harsh environments

Method used

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  • Rare earth ytterbium tantalite ceramic resisting corrosion of low-melting-point oxides and preparation method of rare earth ytterbium tantalite
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  • Rare earth ytterbium tantalite ceramic resisting corrosion of low-melting-point oxides and preparation method of rare earth ytterbium tantalite

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preparation example Construction

[0047] The preparation method of the above-mentioned rare earth tantalate ceramics resistant to corrosion by low melting point oxides comprises the following steps:

[0048] Step (1): Weigh Yb with a molar ratio of Yb:Ta of 1:1 or 3:1 2 o 3 Powder and Ta 2 o 5 Powder, mixed with distilled water or ethanol solvent, where Yb 2 o 3 Powder and Ta 2 o 5 The molar ratio of the powder to the solvent is (3:1)~(5:1), and the ball mill is used for ball milling, and the powder A is obtained after drying; the ball mill adopts a frequency conversion planetary ball mill, the model is XQM, and the ball milling time is 10~24h , the speed of the ball mill is 300~500r / min, and the raw material Yb 2 o 3 Powder and Ta 2 o 5 The purity of the powder is not less than 99.9%.

[0049] Step (2): Dry the powder obtained in step (1) and sieve for the first time to obtain powder B, wherein the drying temperature is 50-200°C, the drying time is 8-24h, and the mesh size of the first sieve is 10...

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Abstract

The invention relates to the technical field of thermal barrier coatings, and particularly discloses a rare earth ytterbium tantalite ceramic resisting corrosion of low-melting-point oxides and a preparation method of the rare earth ytterbium tantalite. The ceramic is formed by sintering of Yb2O3 powder and Ta2O5 powder, the chemical general formula of the ceramic is YbTaO4 or Yb3TaO7, and the compactness of the ceramic is greater than 97%; the preparation method of the ceramic comprises the steps that the Yb2O3 powder and the Ta2O5 powder are weighed, a solvent is added for mixing, the mixture is subjected to ball milling by a ball mill, and powder A is obtained; the powder A is dried and sieved, and powder B is obtained; the powder B is compacted and pre-sintered to form a block C, and the block C is cooled and ground by a grinding machine and is subjected to secondary sieving to obtain powder D; the powder D is sintered to obtain the rare earth ytterbium tantalite ceramic resistingthe corrosion of the low-melting-point oxides. By adopting the technical scheme, the obtained ytterbium tantalite ceramic is high in compactness and can resist high-temperature corrosion of the low-melting-point oxides.

Description

technical field [0001] The invention relates to the technical field of thermal barrier coatings, in particular to rare earth ytterbium tantalate ceramics resistant to corrosion by low melting point oxides 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; ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/495C04B35/50C04B35/622
CPCC04B35/495C04B35/50C04B35/622C04B2235/3224C04B2235/3253C04B2235/77C04B2235/604C04B2235/72C04B35/6262C04B35/62645C04B35/62655C04B2235/5436C04B2235/81C04B2235/761C04B2235/9669C04B35/645C04B2235/6567F01D5/288F01D25/007F05D2300/21F05D2300/13Y02T50/60
Inventor 冯晶种晓宇
Owner KUNMING UNIV OF SCI & TECH
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