Tetragonal-phase high-entropy thermal barrier coating material and preparation method thereof

A technology of thermal barrier coating and tetragonal phase, which is applied in the field of tetragonal phase high-entropy thermal barrier coating material and its preparation, and can solve the problems of poor phase stability at high temperature

Active Publication Date: 2021-12-21
EAST CHINA UNIV OF SCI & TECH +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to solve the problems of poor high-temperature phase stability of known thermal barrier coating materials in the pr

Method used

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  • Tetragonal-phase high-entropy thermal barrier coating material and preparation method thereof
  • Tetragonal-phase high-entropy thermal barrier coating material and preparation method thereof
  • Tetragonal-phase high-entropy thermal barrier coating material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0026] Example 1

[0027] Multi-component ZR according to high entropy design 1-4x Y x M x TA x NB x O 2 Each cationic atomic percentage weighs a certain amount of each oxide powder (where x is 0.2, the component is Zr 0.2 Y 0.2 YB 0.2 TA 0.2 NB 0.2 O 2 ), Including Zro 2 Y 2 O 3 YB 2 O 3 , TA 2 O 5 , NB 2 O 5 The oxide powder is placed in different aluminum oxide crucibles, respectively, inserted in a box muffle for 2 h, and the controlling rate and cooling rate are 5 ° C / min to remove adsorbed water in the original powder and Impurities.

[0028] Pour the various oxide powders of the calcined oxide powder into a high-energy ball grinding, add a quantity of isopropanol (100 mL) and zirconia grinding ball (0.3 mM, the ball ratio of 10: 1), perform high energy ball mill, ball mill The rotational speed is 2500 / min, the ball milling time is 12h.

[0029] The suspension after the high energy ball was separated, and 6 was washed 6 times with anhydrous ethanol, and the obtained mixe...

Example Embodiment

[0036] Example 2

[0037] Multi-component ZR according to high entropy design 1-4x Y x M x TA x NB x O 2 Each cationic atomic percentage has a certain amount of each oxide powder (where x is 0.179, and the component is ZR. 0.284 Y 0.179 YB 0.179 TA 0.179 NB 0.179 O 2 ), Including Zro 2 Y 2 O 3 YB 2 O 3 , TA 2 O 5 , NB 2 O 5 The oxide powder is placed in different alumina crucibles, respectively, inserted into the box muffle in 1 h, and the controlling rate and cooling rate are 10 ° C / min to remove the adsorbed water in the original powder and Impurities.

[0038] Pour the various oxide powders after calcination into a high-energy ball grinding tank, add a quantity of isopropanol (120 mL) and zirconia grinding ball (0.4 mm, the ball ratio of 10: 1), perform high energy ball mill, ball mill The rotational speed is 2100r / min, and the ball milling time is 12h.

[0039] The suspension after the high-energy ball was separated, 6 times was washed with isopropyl alcohol, and the resul...

Example Embodiment

[0049] Example 3

[0050] Multi-component ZR according to high entropy design 1-4x Y x M x TA x NB x O 2 Each cationic atomic is weighing a certain amount of each oxide powder (where x is 0.119, the component is Zr 0.524 Y 0.119 YB 0.119 TA 0.119 NB 0.119 O 2 ), Including Zro 2 Y 2 O 3 YB 2 O 3 , TA 2 O 5 , NB 2 O 5Oxide powder were placed in separate alumina crucible placed in a box-type muffle furnace at 1000 ℃ incubated 3h, control the heating rate and cooling rate are 8 ℃ / min, to remove the adsorbed water and the raw powder impurities.

[0051] The calcined powder was put into various oxides to high-energy ball mill jar, adding a certain amount of isopropanol (90ml) and zirconia balls (0.3 mm, ball feed ratio of 8: 1), high energy milling, ball milling speed of 2700r / min, the milling time 8h.

[0052] The high-energy ball milling after the suspension of the ball material separated, washed with isopropanol 5 times, and the obtained mixed suspension was placed after 40h dryi...

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Abstract

The invention relates to a tetragonal phase high-entropy thermal barrier coating material. The material is formed by ZrO2, Y2O3, M2O3, Ta2O5 and Nb2O5 oxide powder, the component of the material is Zr1-4xYxMxTaxNbxO2, x is more than 0 and less than 0.25, and M is a trivalent rare earth element. The invention also relates to a preparation method of the tetragonal-phase high-entropy thermal barrier coating material. The preparation method comprises the following steps: calcining to remove adsorbed water and impurities in each oxide powder; performing high-energy ball milling; separating, washing and drying balls to obtain mixed powder; and pressing into a ceramic blank by using a ceramic tablet press, and heating to obtain the high-entropy ceramic block material. According to the tetragonal-phase high-entropy thermal barrier coating material, excellent thermodynamic properties are provided through multi-component high entropy, including reduction of heat conductivity, increase of thermal expansion coefficient, enhancement of fracture toughness, good high-temperature stability, excellent CMAS corrosion resistance and the like, and the tetragonal-phase high-entropy thermal barrier coating material has the potential of serving at a higher gas temperature.

Description

technical field [0001] The present invention relates to a thermal barrier coating, more particularly to a tetragonal high-entropy thermal barrier coating material and a preparation method thereof. Background technique [0002] Thermal Barrier Coatings are used to protect the alloy blades of high-pressure turbine components in ground gas turbines and aero-engines from corrosion and oxidation by high-temperature gas, and increase the turbine inlet temperature, thereby greatly improving the working efficiency of gas turbines and aero-engines . [0003] Currently the most widely used thermal barrier coating material is 7-8wt% yttria-stabilized zirconia (7-8YSZ). In order to pursue higher working efficiency of gas turbines, the gas service temperature of the next generation of gas turbines will definitely exceed 1500°C, which is higher than the current application range of 7-8YSZ thermal barrier coatings. The known thermal barrier coating materials have disadvantages such as po...

Claims

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Application Information

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IPC IPC(8): C04B35/66C04B35/495C04B35/488C04B35/622
CPCC04B35/66C04B35/495C04B35/488C04B35/62222C04B2235/3225C04B2235/3246C04B2235/3224C04B2235/3251C04B2235/9607C04B2235/9669C04B2235/96Y02T50/60
Inventor 张显程赵晓峰郭芳威石俊秒杨凯王卫泽刘利强范晓慧姚尧
Owner EAST CHINA UNIV OF SCI & TECH
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