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A2B2O7 type rare earth tantalate ceramic and preparation method thereof

A technology of A2B2O7 and tantalate, applied in the field of thermal barrier coating, can solve the problem of lack of B-site regulation performance, and achieve the effect of reducing thermal conductivity

Active Publication Date: 2020-11-13
KUNMING UNIV OF SCI & TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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

Examples

Experimental program
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Effect test

Embodiment 1

[0034] A kind of A2B2O7 type rare earth tantalate ceramics, the structure formula of this ceramics 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 3Add the solution drop by drop (the dropping speed is 200mL / min), keep stirring, and at the same time add ammonia water to stabilize the pH of the system at 9-10, after stirring for 1 hour, continue stirring for 30 minutes in a water bath environment at 100°C, and then use Wash the precipitate with ionic water until PH = 7, put the obtained filter cake in an oven and dry it at 120°C for 5 hours, then pass through a 500-mesh sieve and sinter at 900°C for 5 hours, and pass the sintered powder through a 500-mesh sieve again spare.

[0036] Step 2: Pu...

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 particularly discloses an A2B2O7 type rare earth tantalate ceramic and a preparation method thereof. The preparation method comprises the following steps: respectively dissolving RE2O3 and M2O3 into concentrated nitric acid according to the structural formula of RE2MTaO7 to react and adjusting the pH value to be not lessthan 1.5, dropwise adding a TaOCl3 solution, continuously stirring, adding ammonia water to stabilize the pH value of the system at 9-10, continuously stirring in a water bath environment, washing the precipitate with deionized water until the pH value is 7, drying the obtained filter cake in a drying oven, and screening for later use; and placing the powder in a graphite grinding tool, performing spark plasma sintering in a sintering furnace, then performing annealing and carbon removal on a sintered sample to obtain a compact RE2MTaO7 block. The material has the characteristics of low heatconductivity, high hardness, fracture toughness and the like.

Description

technical field [0001] The invention relates to the technical field of thermal barrier coatings, in particular to an A2B2O7 type rare earth tantalate ceramic and a 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. At present, 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 is low. High (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 temper...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/495C04B35/622C04B35/645C04B37/02
CPCC04B35/495C04B35/622C04B35/645C04B37/023C04B2235/662C04B2235/666C04B2235/3225C04B2235/3272C04B2235/444C04B2235/96C04B2235/3224C04B2235/9607
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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