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Three-rare-earth niobate ceramic and preparation method thereof

A niobate and ceramic technology, applied in the field of three rare earth niobate ceramics and their preparation, can solve the problem of high thermal conductivity, achieve the effects of low thermal conductivity, reduced thermal mismatch stress, and high thermal expansion coefficient

Inactive Publication Date: 2019-07-23
KUNMING UNIV OF SCI & TECH
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  • Abstract
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  • Application Information

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Problems solved by technology

[0005] The invention provides a triple rare earth niobate 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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  • Three-rare-earth niobate ceramic and preparation method thereof
  • Three-rare-earth niobate ceramic and preparation method thereof
  • Three-rare-earth niobate ceramic and preparation method thereof

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preparation example Construction

[0049] The preparation method of the above-mentioned three rare earth niobate ceramics comprises the following steps:

[0050] Step (1): Weigh La with a molar ratio of La:Gd:Ho:Nb of 3(1-x-y):3x:3y:1 (02 o 3 Powder, Gd 2 o 3 Powder, Ho 2 o 3 Powder and Nb 2 o 5 Powder, add distilled water or ethanol solvent for mixing, then add sintering aid TiO 2 Powder and ZrO 2 powder, where TiO 2 The molar mass of the powder is Nb 2 o 5 0.01 to 0.05 times the molar weight of the powder, ZrO 2 The molar mass of the powder is Nb 2 o 5 0.04 to 0.1 times the molar weight of the powder, and the above six powders (La 2 o 3 Powder, Gd 2 o 3 Powder, Ho 2 o 3 Powder, Nb 2 o 5 Powder, TiO 2 Powder and ZrO 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 2000~3000...

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Abstract

The invention relates to the technical field of thermal barrier coating layers and specifically discloses three-rare-earth niobate ceramic. The ceramic is prepared by sintering La2O3 powder, Gd2O3 powder, Ho2O3 powder and Nb2O5 powder; a chemical general formula of the ceramic is (La1-x-yGdxHoy)3NbO7; when x+y is smaller than or equal to 5 / 6, a crystal structure of the ceramic is an orthorhombic phase; when x+y is larger than 5 / 6, the ceramic is a cubic phase; the compactness of the ceramic is larger than 98%. The preparation method of the ceramic comprises the steps: weighing the La2O3 powder, the Gd2O3 powder, the Ho2O3 powder and the Nb2O5 powder according to the molar ratio of La to Gd to Ho to Nb as 3(1-x-y) to 3x to 3y to 1, adding a solvent, mixing and grinding to obtain powder A; drying the powder A and primarily sieving to obtain powder B; putting the powder B into a mould, compressing, presintering to obtain a block C, grinding after the block C is cooled and then secondarilysieving to obtain powder D; sintering the powder D to obtain the three-rare-earth niobate ceramic. The three-rare-earth niobate ceramic disclosed by the technical scheme of the invention has the advantages of high compactness, low thermal conductivity under high temperature and high thermal expansion coefficient.

Description

technical field [0001] The invention relates to the technical field of thermal barrier coatings, in particular to three rare earth niobate 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...

Claims

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Application Information

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IPC IPC(8): C04B35/495C04B35/50C04B35/622
CPCC04B35/495C04B35/50C04B35/62222C04B2235/3227C04B2235/3224C04B2235/9607
Inventor 冯晶种晓宇
Owner KUNMING UNIV OF SCI & TECH
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