A2B2O7 type rare earth tantalate ceramics and preparation method thereof

A technology of A2B2O7 and tantalate, applied in the field of thermal barrier coatings, can solve problems such as lack of B-site regulation performance

Active Publication Date: 2021-09-14
KUNMING UNIV OF SCI & TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although as a kind of low thermal conductivity material, it has both good thermal and mechanical properties, but the research on the control performance of B site is still relatively lacking in China.

Method used

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  • A2B2O7 type rare earth tantalate ceramics and preparation method thereof
  • A2B2O7 type rare earth tantalate ceramics and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] A 2 B 2 o 7 type rare earth tantalate ceramics, the structure of which is Y 2 FeTaO 7 , the preparation method of the ceramics comprises the following steps:

[0035]Step 1: Follow Y 2 FeTaO 7 The structural formula will be the appropriate amount of Y 2 o 3 and Fe 2 o 3 respectively dissolved in concentrated nitric acid for reaction, and the pH was adjusted to about 1, and then the prepared TaOCl 3 The solution was added dropwise (the speed of dropping was 200mL / min), stirring constantly, adding ammonia water to stabilize the pH of the system at 9~10, after stirring for 1 hour, continue stirring for 30min in a 100°C water bath environment, and then use Wash the precipitate with deionized water continuously until pH = 7, place the obtained filter cake in an oven for 5 hours at 120°C, then pass through a 500-mesh sieve and sinter at 900°C for 5 hours, and the sintered powder is again Pass through a 500 mesh sieve for later use.

[0036] Step 2: Place the powde...

Embodiment 2

[0039] The difference from Example 1 is that the ceramic structural formula of Example 2 is Dy 2 FeTaO 7 , the preparation method of the ceramics is the same as in Example 1.

Embodiment 3

[0041] The difference from Example 1 is that the ceramic structural formula in Example 3 is Eu 2 AlTaO 7 , the preparation method of the ceramics is the same as in Example 1.

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Abstract

The invention relates to the technical field of thermal barrier coatings, and specifically discloses an A2B2O7 type rare earth tantalate ceramic and a preparation method thereof. According to RE 2 MtO 7 The structural formula will be RE 2 o 3 and M 2 o 3 respectively dissolved in concentrated nitric acid for reaction, and adjust the pH to not less than 1.5, and then add TaOCl 3 Add the solution drop by drop, keep stirring, add ammonia water at the same time to stabilize the pH of the system at 9-10, continue stirring in the water bath environment, then wash the precipitate with deionized water until the pH = 7, put the obtained filter cake in the oven internal drying, and then sieved for later use; put the powder in a graphite grinding tool, conduct spark plasma sintering in a sintering furnace, and then anneal and remove carbon from the sintered sample to obtain a dense RE 2 MtO 7 In bulk, this material has properties such as low thermal conductivity, high hardness, and fracture toughness.

Description

technical field [0001] The invention relates to the technical field of thermal barrier coatings, in particular to a 2 B 2 o 7 Type rare earth tantalate ceramics and preparation method thereof. Background technique [0002] As a thermal insulation material that can reduce the surface temperature of the alloy, the thermal barrier coating can ensure that the alloy parts of the gas turbine can work normally at high temperatures, thereby improving the thermal efficiency and service life of the gas turbine. Currently, the industry standard for thermal barrier coatings is yttria-stabilized zirconia (YSZ). Its high thermal expansion coefficient, high hardness, and high fracture toughness are beyond the reach of other materials, but its service temperature is low (≤1200°C), and its thermal conductivity Higher (2.5W.m -1 .k -1 ) also limits its future development. The future development needs of engines and gas turbines with high thrust-to-weight ratio and high outlet temperature...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/495C04B35/622C04B35/645C04B37/02
CPCC04B35/495C04B35/622C04B35/645C04B37/023C04B2235/3224C04B2235/3225C04B2235/3272C04B2235/444C04B2235/662C04B2235/666C04B2235/96C04B2235/9607
Inventor 冯晶郑奇杨凯龙汪俊陈琳张志东李振军王峰
Owner KUNMING UNIV OF SCI & TECH
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