High-entropy ceramic powder used for thermal barrier coating and preparation method of ceramic powder

A technology of ceramic powder and thermal barrier coating, which is applied in the field of high-entropy ceramic powder for thermal barrier coating and its preparation, can solve the problem of high thermal conductivity of rare earth zirconate, achieve excellent low thermal conductivity, and is easy to realize The effect of large-scale and simple preparation process

Active Publication Date: 2019-09-24
DONGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The target thermal conductivity of thermal barrier coating materials is less than 1W·m –1 ·K –1 , but the inherent thermal conductivity of rare earth zirconates is still high
However, there is no report on high-entropy zirconates with pyrochlore structure

Method used

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  • High-entropy ceramic powder used for thermal barrier coating and preparation method of ceramic powder
  • High-entropy ceramic powder used for thermal barrier coating and preparation method of ceramic powder
  • High-entropy ceramic powder used for thermal barrier coating and preparation method of ceramic powder

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] A preparation method of high-entropy ceramic powder for thermal barrier coatings:

[0026] La 2 o 3 、Nd 2 o 3 、Sm 2 o 3 、Eu 2 o 3 、Gd 2 o 3 The original powder (particle size 1μm, purity 99wt%) and ZrO 2 (Particle diameter 0.2 μm, purity 99 wt%) were compounded in a molar ratio of 1:1:1:1:1:5 (the molar ratio of rare earth elements was 0.2:0.2:0.2:0.2:0.2:1). With ethanol as the medium, ZrO 2 The ball is a grinding ball, and the ball mill is mixed at a speed of 560 rpm for 8 hours on a planetary ball mill, and a dry mixed powder with a uniform composition is obtained through rotary evaporation; the obtained mixed powder with a uniform composition is put into an alumina crucible, and then Put it in a muffle furnace, in an air atmosphere, raise the temperature at a rate of 1°C / min, and keep it at 1000°C for 1h to prepare high-entropy ceramic powder.

[0027] After analysis: the XRD pattern of the prepared high-entropy ceramic powder is as follows figure 1show...

Embodiment 2

[0029] A preparation method of high-entropy ceramic powder for thermal barrier coatings:

[0030] Will Y 2 o 3 , La 2 o 3 、Sm 2 o 3 、Eu 2 o 3 、Gd 2 o 3 The original powder (particle size 5μm, purity 99wt%) and ZrO 2 Powder (particle diameter 0.5 μm, purity 99wt%) carries out batching in molar ratio 1:1:1:1:1:5 (the molar ratio of rare earth element is 0.2:0.2:0.2:0.2:0.2:1), with ethanol as Medium, ZrO 2 The ball is a grinding ball, and the ball mill is mixed at a speed of 500 rpm for 16 hours on a planetary ball mill, and a dry mixed powder with a uniform composition is obtained through rotary evaporation; the obtained mixed powder with a uniform composition is put into an alumina crucible, and then Put it in a muffle furnace, raise the temperature at a rate of 10°C / min in an air atmosphere, and keep it at 1200°C for 3 hours to prepare high-entropy ceramic powder.

[0031] After analysis: the XRD pattern of the prepared high-entropy ceramic powder is as follows ...

Embodiment 3

[0033] A preparation method of high-entropy ceramic powder for thermal barrier coatings:

[0034] Will Y 2 o 3 , La 2 o 3 、Nd 2 o 3 、Sm 2 o 3 、Gd 2 o 3 The original powder (particle size 10μm, purity 99wt%) and ZrO 2 The powder (0.8 μm in particle size, 99 wt% in purity) is prepared in a molar ratio of 1:1:1:1:1:5 (the molar ratio of rare earth elements is 0.2:0.2:0.2:0.2:0.2:1) Medium, ZrO 2 The ball is a grinding ball, and the ball mill is mixed at a speed of 450 rpm for 20 hours on a planetary ball mill, and a dry mixed powder with a uniform composition is obtained through rotary evaporation; the obtained mixed powder with a uniform composition is put into an alumina crucible, and then Place it in a muffle furnace, raise the temperature at a rate of 15°C / min in an air atmosphere, and keep it at 1500°C for 8 hours to prepare high-entropy ceramic powder.

[0035] After analysis: the XRD pattern of the prepared high-entropy ceramic powder is as follows image 3 sh...

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Abstract

The invention discloses high-entropy ceramic powder used for a thermal barrier coating. The ceramic powder is characterized by having a pyrochlore structure and a chemical formula of RE2Zr2O7, wherein RE is any 3-7 different metal elements selected from rare earth elements including Y, La, Pr, Nd, Sm, Eu and Gd, and the percentage of one mole number of each RE element to the total mole number of all RE elements is 5%-35%. The preparation method comprises the following steps: mixing RE2O3 powder and ZrO2 powder, and heating the mixed powder under the heating condition of 1000-1700 DEG C for 1-10 h in an air atmosphere to obtain the high-entropy ceramic powder. According to the method provided by the invention, the high-entropy ceramic powder prepared by the method enriches a system of a thermal barrier coating material, has the advantages of low costs, simple and easy operation, a wide application range and the like, and is expected to be used in the field of thermal barrier coatings.

Description

technical field [0001] The invention relates to a high-entropy ceramic powder for thermal barrier coatings and a preparation method thereof, belonging to the technical field of thermal barrier coating materials. Background technique [0002] Pyrochlore-structured rare earth zirconates (RE 2 Zr 2 o 7 , wherein, RE is a rare earth element, or doped with another rare earth element) has low thermal conductivity, is compatible with metal substrates, has high stability at high temperatures and good sintering resistance, etc., and can be used as a thermal Barrier coating materials are used. For example, it is applied to the surface of metal alloys of gas turbines or jet engines to protect the metal substrate from overheating and failure during long-term service. RE 2 Zr 2 o 7 Its low thermal conductivity is better than that of YSZ, which is widely used at present, and its phase and structure are still stable during high temperature and long-term use. It can even increase the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/488C04B35/626
CPCC04B35/488C04B35/6261C04B35/62675C04B35/6268C04B2235/3224C04B2235/3225C04B2235/3227C04B2235/5436C04B2235/5445
Inventor 张国军周林李飞刘吉轩
Owner DONGHUA UNIV
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