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A high-temperature heat-insulating protective coating structure and preparation method thereof

A technology of protective coating and heat insulation layer, which is applied in the direction of coating, metal material coating process, fusion spraying, etc., can solve the problems of short working life, cracks, peeling, etc., to prevent performance degradation and prevent ablation loss , Improve the effect of bonding strength

Active Publication Date: 2021-05-11
AVIC BEIJING AERONAUTICAL MFG TECH RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The thermal protective coating of single zirconium carbide or zirconium diboride is easy to crack or even peel off during heating when used alone in an environment of 1700 ° C, and the working life is very short

Method used

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  • A high-temperature heat-insulating protective coating structure and preparation method thereof
  • A high-temperature heat-insulating protective coating structure and preparation method thereof

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preparation example Construction

[0025] The embodiment of the present invention is aimed at the working temperature of barium strontium aluminum silicon (BSAS) and rare earth silicate thermal protection coating containing silicon oxide on the surface of SiC / SiC composite material in the prior art, and the working temperature is not higher than 1500°C. Zirconium carbide and zirconium diboride coatings have good ablation resistance at 1700°C, but the coating itself has no heat insulation function, and it is easy to crack or even peel off during heating when used alone, and the working life is too short. A high-temperature heat-insulating protective coating structure and a preparation method thereof are provided, especially for use in the technical field of high-temperature coating preparation, especially a coating structure of a high-temperature heat-insulating protective coating and a preparation method thereof. The structure of the high temperature thermal insulation protective coating includes:

[0026] Adde...

Embodiment 1

[0040] Clean the SiC / SiC composite surface with dry and clean compressed air. Spraying and adding MoSi on the surface of SiC / SiC composite materials by vacuum plasma spraying process 2 ZrB 2 Anti-oxidation bottom layer, MoSi in powder material 2 The volume fraction is 30%, the particle size of the powder material is in the range of 5-40 microns, the vacuum plasma spraying power is 45KW, the powder feeding rate is 20g / min, the spraying distance is 240mm, and the thickness of the bottom layer is 0.15mm.

[0041] On the above-mentioned vacuum plasma spraying anti-oxidation bottom layer, the heat insulation layer is prepared by atmospheric plasma spraying process, and the powder material of the heat insulation layer is rare earth Sc 2 o 3 , Y 2 o 3 Co-doped ZrO 2 , where Sc 2 o 3 The mole fraction is 5.5%, Y 2 o 3 The mole fraction is 0.9%, the rest is ZrO 2 , The particle size of the powder material is in the range of 10-50 microns, the atmospheric plasma spraying powe...

Embodiment 2

[0044] Clean the SiC / SiC composite surface with dry and clean compressed air. Spraying SiC-added ZrB on the surface of SiC / SiC composites by vacuum plasma spraying process 2 Anti-oxidation bottom layer, the volume fraction of SiC in the powder material is 25%, the particle size of the powder material is in the range of 5-40 microns, the vacuum plasma spraying power is 45KW, the powder feeding rate is 20g / min, the spraying distance is 200mm, and the bottom layer thickness is 0.15mm.

[0045] On the above-mentioned vacuum plasma spraying anti-oxidation bottom layer, the heat insulation layer is prepared by atmospheric plasma spraying process, and the powder material of the heat insulation layer is rare earth Sc 2 o 3 , Y 2 o 3 Co-doped ZrO 2 , where Sc 2 o 3 The mole fraction is 5.5%, Y 2 o 3 The mole fraction is 0.9%, the rest is ZrO 2 , The particle size of the powder material is in the range of 10-50 microns, the atmospheric plasma spraying power is 42KW, the powder ...

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Abstract

The invention provides a high-temperature heat-insulating protective coating structure and a preparation method thereof, which include adding MoSi layered on the surface of a SiC / SiC composite material substrate in sequence 2 or SiC ZrB 2 Antioxidant Primer, Sc 2 o 3 , Y 2 o 3 Co-doped ZrO 2 Insulation layer and LaMgAl 11 o 19 Ablation resistant functional layer. The present invention combines oxidation-resistant, heat-insulating, and ablation-resistant coatings with different functions to form a three-layer structure composite coating system. The high-temperature heat-insulating protective coating of the present invention can be applied to SiC / SiC composite ultra-high temperature components heat protection.

Description

technical field [0001] The invention relates to the technical field of high-temperature coating preparation, in particular to a high-temperature heat-insulating protective coating structure and a preparation method thereof. Background technique [0002] At present, the working temperature of silicon carbide fiber reinforced silicon carbide composite (SiC / SiC) components has been raised to 1700 °C or even higher. Since the performance of SiC / SiC composites without thermal protective coatings will be seriously degraded in high-temperature water vapor and aerobic environments, high-temperature thermal insulation protective coatings are necessary for high-temperature applications of SiC / SiC composites. [0003] At present, the working temperature of barium strontium aluminum silicon (BSAS) and rare earth silicate thermal protective coating containing silicon oxide on the surface of SiC / SiC composite material is not higher than 1500 °C. The thermal protective coating using singl...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C4/134C04B41/89
CPCC04B41/009C04B41/52C04B41/89C04B35/806C04B41/507C04B41/4527C04B41/5071C04B41/5045
Inventor 李其连李淑青王纯杨伟华
Owner AVIC BEIJING AERONAUTICAL MFG TECH RES INST
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