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Oxide high-entropy ceramic with defective fluorite structure and preparation method of anti-ablation coating of oxide high-entropy ceramic

A fluorite structure and oxide technology, applied in the field of surface coating, can solve the problems of deterioration of coating anti-ablation performance, unstable phase structure of high-entropy ceramics, etc., and achieve excellent anti-ablation performance, excellent phase stability and Anti-ablation performance, effect of low ablation rate

Active Publication Date: 2021-11-23
NORTHWESTERN POLYTECHNICAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] In order to avoid the deficiencies of the prior art, the present invention proposes a preparation method of an oxide high-entropy ceramic with a defective fluorite structure and its anti-ablation coating, which solves the problem of unstable phase structure of the high-entropy ceramic and coating Deterioration of layer ablation resistance

Method used

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  • Oxide high-entropy ceramic with defective fluorite structure and preparation method of anti-ablation coating of oxide high-entropy ceramic
  • Oxide high-entropy ceramic with defective fluorite structure and preparation method of anti-ablation coating of oxide high-entropy ceramic
  • Oxide high-entropy ceramic with defective fluorite structure and preparation method of anti-ablation coating of oxide high-entropy ceramic

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Experimental program
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Effect test

Embodiment 1

[0037] Step 1: HfO 2 , ZrO 2 、Sm 2 o 3 、Er 2 o 3 , Y 2 o 3 The powder is weighed according to the molar ratio of 2:2:1:1:1, and the weighed raw material powder and absolute ethanol are placed in a polytetrafluoroethylene ball mill tank for 12 hours of ball milling. After this step Can obtain evenly mixed raw material mixed powder;

[0038] Step 2: Dry the mixed powder obtained in Step 1 in an oven at 80° C. for 12 hours to fully volatilize the absolute ethanol. Then place the dried mixed powder in a high-temperature heat treatment furnace, raise the furnace temperature from room temperature to 1200°C at a rate of 5°C / min in an air atmosphere, keep it at this temperature for 1 hour, and then heat it at a rate of 3°C / min. Raise the furnace temperature to 1600°C at a heating rate of 1600°C, and keep it at this temperature for 12 hours. After the heat preservation is completed, lower the furnace temperature to 800°C at a cooling rate of 4°C / min, then turn off the heating p...

Embodiment 2

[0042] Step 1: HfO 2 , ZrO 2 、Sm 2 o 3 、Er 2 o 3 , Y 2 o 3 The powder is weighed according to the molar ratio of 1:1:1:1:1, and the weighed raw material powder and absolute ethanol are placed in a polytetrafluoroethylene ball mill tank for 12 hours of ball milling. After this step Can obtain evenly mixed raw material mixed powder;

[0043] Step 2: Dry the mixed powder obtained in Step 1 in an oven at 80° C. for 12 hours to fully volatilize the absolute ethanol. Then place the dried mixed powder in a high-temperature heat treatment furnace, raise the furnace temperature from room temperature to 1200°C at a rate of 5°C / min in an air atmosphere, keep it at this temperature for 1 hour, and then heat it at a rate of 3°C / min. Raise the furnace temperature to 1600°C at a heating rate of 1600°C, and keep it at this temperature for 12 hours. After the heat preservation is completed, lower the furnace temperature to 800°C at a cooling rate of 4°C / min, then turn off the heating p...

Embodiment 3

[0047] Step 1: HfO 2 , ZrO 2 , CeO 2 , Yb 2 o 3 , Y 2 o 3 The powder is weighed according to the molar ratio of 2:2:2:1:1, and the weighed raw material powder and absolute ethanol are placed in a polytetrafluoroethylene ball mill tank for 12 hours of ball milling. After this step Can obtain evenly mixed raw material mixed powder;

[0048] Step 2: Dry the mixed powder obtained in Step 1 in an oven at 80° C. for 12 hours to fully volatilize the absolute ethanol. Then place the dried mixed powder in a high-temperature heat treatment furnace, raise the furnace temperature from room temperature to 1200°C at a rate of 5°C / min in an air atmosphere, keep it at this temperature for 1 hour, and then heat it at a rate of 3°C / min. Raise the furnace temperature to 1600°C at a heating rate of 1600°C, and keep it at this temperature for 12 hours. After the heat preservation is completed, lower the furnace temperature to 800°C at a cooling rate of 4°C / min, then turn off the heating pow...

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Abstract

The invention relates to oxide high-entropy ceramic with a defective fluorite structure and a preparation method of an anti-ablation coating of the oxide high-entropy ceramic. The preparation method comprises the following steps of: firstly, preparing high-entropy ceramic powder by adopting a high-temperature solid-phase reaction method; and then, by using a supersonic plasma spraying technology, preparing a high-entropy ceramic coating with corresponding components on the surface of a base material by using the high-entropy ceramic powder having been subjected to spray drying treatment. The high-entropy ceramic coating (HfZr(3RE))O2-delta (wherein RE is selected from Sm, Er, Ce, Y, Yb) provided by the invention has excellent phase stability and ablation resistance. In a supersonic plasma spraying process, the high-entropy ceramic is free of phase change and phase decomposition, and the prepared high-entropy ceramic coating still keeps the phase structure of the original high-entropy ceramic powder. The high-entropy ceramic coating is ablated and examined in oxyacetylene flames with heat flux density of 2.38 MW / m<2>, the highest temperature of the surface of the coating in the ablating process reaches 1900-2100 DEG C, the ablated coating does not have the phenomena of stripping, peeling and the like, an ablating rate is low, and excellent anti-ablating performance is shown.

Description

technical field [0001] The invention belongs to the technical field of surface coatings, and relates to an oxide high-entropy ceramic with a defect fluorite structure and a preparation method for an anti-ablation coating thereof. Background technique [0002] In recent years, with the continuous improvement of the performance requirements of aerospace vehicles, the service environment of high-temperature hot-end component materials has gradually developed in the direction of long-term, high enthalpy, and high heat flux. For the increasingly harsh service environment, the requirements for high-temperature hot-end component materials for ablation resistance, heat insulation, and thermal stability are gradually increasing. The development of new thermal protective coating materials has become a recognized method to improve the service performance of hot-end parts materials. [0003] High-entropy ceramics refer to a single-phase multi-component solid solution formed by 5 or mor...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/66C04B35/48C04B35/626C04B35/622
CPCC04B35/66C04B35/48C04B35/62605C04B35/62222C04B2235/3224C04B2235/3225C04B2235/3229C04B2235/9607Y02T50/60
Inventor 孙佳郭凌翔张育育刘冰张佩
Owner NORTHWESTERN POLYTECHNICAL UNIV
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