High-temperature-resistant ablation-resistant composite coating and preparation method thereof

A composite coating and anti-ablation technology, which is applied in coating, metal material coating process, fusion spraying, etc., can solve the problems of fast volatilization speed and poor thermodynamic stability, and achieve low porosity, low cost, and good The effect of oxygen barrier performance

Inactive Publication Date: 2021-03-16
SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But the glass phase SiO 2 The thermodynamic stability of the ablation environment above 1650°C is poor, and the volatilization speed is fast

Method used

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  • High-temperature-resistant ablation-resistant composite coating and preparation method thereof
  • High-temperature-resistant ablation-resistant composite coating and preparation method thereof
  • High-temperature-resistant ablation-resistant composite coating and preparation method thereof

Examples

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preparation example Construction

[0047] Preparation of raw material powder. The main phase ZrB 2 Powder, second phase MoSi 2 powder, and the third phase Yb 2 o 3 The powders are mixed according to a certain ratio to obtain raw material powders. Among them, the second phase MoSi 2 The content of the powder accounts for 5-30vol.%, preferably 20-30%, of the total volume of the raw material powder. Yb 2 o 3 The content accounts for 5-20 mol.%, preferably 5-15 mol.% of the total moles of raw material powder. Specifically, the main phase ZrB 2 Powder, second phase MoSi 2 Powder and third phase Yb 2 o 3The powder is mixed according to a certain ratio to obtain ZrB 2 -MoSi 2 -Yb 2 o 3 Composite powder. The powder mixing method can adopt the planetary ball milling method. In the case of a planetary ball mill, the mixing process includes, for example: using absolute ethanol or deionized water as a medium, using ZrO 2 Mixing is carried out, and the mixing time can be 2-10 hours. The uniformly mixed pow...

Embodiment 1

[0054] A kind of high temperature and anti-ablation composite coating, made of ZrB 2 -MoSi 2 -Yb 2 o 3 composition. Among them, ZrB 2 The particle size of the powder ranges from 5 to 90 μm, and the purity is 99.0wt.%. MoSi 2 The particle size of the powder ranges from 5 to 90 μm, and the purity is 99.0wt.%; Yb 2 o 3 The particle size range of the powder is 5-90 μm, and the purity is 99.0wt.%. Prepare above-mentioned composite coating and carry out according to the following steps:

[0055] (1) With the C / C composite material covered with SiC transition layer as the substrate, the surface of the substrate is subjected to sandblasting roughening treatment, the blasting pressure is 0.2MPa, and absolute ethanol is used as the medium, and ultrasonic cleaning is performed twice, each time 10 minutes, dry in an oven at 100°C for 1 to 2 hours, and set aside;

[0056] (2)ZrB 2 、MoSi 2 and Yb 2 o 3 The powders are mixed according to a certain ratio, in which the second phas...

Embodiment 2

[0068] A kind of high temperature and anti-ablation composite coating, made of ZrB 2 -MoSi 2 -Yb 2 o 3 composition. Among them, ZrB 2 The particle size of the powder ranges from 5 to 90 μm, and the purity is 99.0wt.%. MoSi 2 The particle size of the powder ranges from 5 to 90 μm, and the purity is 99.0wt.%; Yb 2 o 3 The particle size range of the powder is 5-90 μm, and the purity is 99.0wt.%. Prepare above-mentioned composite coating and carry out according to the following steps:

[0069] (1) With the C / C composite material covered with SiC transition layer as the substrate, the surface of the substrate is subjected to sandblasting roughening treatment, the blasting pressure is 0.2MPa, and absolute ethanol is used as the medium, and ultrasonic cleaning is performed twice, each time 10 minutes, dry in an oven at 100°C for 1 to 2 hours, and set aside;

[0070] (2)ZrB 2 、MoSi 2 and Yb 2 o 3 The powders are mixed according to a certain ratio, in which the second phas...

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Abstract

The invention relates to a high-temperature-resistant ablation-resistant composite coating and a preparation method thereof. The high-temperature-resistant ablation-resistant composite coating comprises a ZrB2 main phase, a MoSi2 second phase and a Yb2O3 third phase, wherein the content of the MoSi2 second phase is 5 to 30 vol.%, the content of the Yb2O3 is 5 to 20 mol.%, and the balance is the ZrB2 main phase.

Description

technical field [0001] The invention relates to a preparation method of a high-temperature-resistant and anti-ablation composite coating, in particular to a ZrB 2 The invention discloses a high-temperature-resistant and ablation-resistant composite coating and a preparation method thereof, belonging to the field of high-temperature protective coatings. Background technique [0002] ZrB 2 It is a typical representative of ultra-high temperature ceramics. It has the characteristics of high melting point, low density, high thermal conductivity, high chemical stability, high melting point of solid-phase oxidation products (2715°C) and wide range of raw material sources. It is a widely used in the aerospace field. High-temperature structural materials with application prospects. But single-phase ZrB 2 It has the disadvantage of poor oxidation resistance, which limits its application range. ZrB 2 B formed during oxidation 2 o 3 The liquid phase will volatilize violently in ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C4/134C23C4/10
CPCC23C4/10C23C4/134
Inventor 牛亚然潘孝辉李崇钟鑫石旻昊郑学斌丁传贤
Owner SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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