Preparation of MoSi<sub>2</sub>-modified HfB<sub>2</sub>-SiC ultra high temperature ceramic anti-oxidation coatings by liquid phase sintering

REN Xuan-ru; WANG Wei-guang; SUN Ke; HU Yu-wen; XU Lei-hua; FENG Pei-zhong

doi:10.1016/S1872-5805(21)60060-4

Volume 37 Issue 3

Jun. 2022

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Article Navigation > New Carbon Mater. > 2022 > 37(3): 603-614

REN Xuan-ru, WANG Wei-guang, SUN Ke, HU Yu-wen, XU Lei-hua, FENG Pei-zhong. Preparation of MoSi2-modified HfB2-SiC ultra high temperature ceramic anti-oxidation coatings by liquid phase sintering. New Carbon Mater., 2022, 37(3): 603-614. doi: 10.1016/S1872-5805(21)60060-4

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REN Xuan-ru, WANG Wei-guang, SUN Ke, HU Yu-wen, XU Lei-hua, FENG Pei-zhong. Preparation of MoSi₂-modified HfB₂-SiC ultra high temperature ceramic anti-oxidation coatings by liquid phase sintering. New Carbon Mater., 2022, 37(3): 603-614. doi: 10.1016/S1872-5805(21)60060-4

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Preparation of MoSi₂-modified HfB₂-SiC ultra high temperature ceramic anti-oxidation coatings by liquid phase sintering

doi: 10.1016/S1872-5805(21)60060-4

China University of Mining and Technology, Xuzhou 221116, China

Funds: The Fundamental Research Funds for the Central Universities (2018GF14)

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Author Bio:
任宣儒, 副教授. E-mail：XuanruRen@163.com
Corresponding author: XU Lei-hua, Associate Professor. E-mail: xuleihua@cumt.edu.cn
Received Date: 2020-03-19
Rev Recd Date: 2020-05-21

Available Online: 2021-04-28

Publish Date: 2022-06-01

Abstract

Abstract

Liquid-phase sintering combining an in-situ reaction method with a slurry method was used to prepare HfB₂-MoSi₂-SiC coatings of controllable composition and thickness. The effect of the MoSi₂ content on the oxidation protection of HfB₂-MoSi₂-SiC composite coatings in a dynamic aerobic environment from room temperature to 1500 °C and a static constant temperature at 1500 °C in air was investigated. The relative oxygen permeability was used to characterize the oxidation resistance of the coatings. The results of dynamic oxidation test at room temperature~1500 °C show that the initial oxidation weight loss temperature of the samples is increased from 775 to 821 °C, and the maximum weight loss rate is decreased from 0.9×10⁻³ to 0.2×10⁻³ mg·cm⁻²·s⁻¹ with increasing MoSi₂ content, the lowest relative oxygen permeability is reduced to 12.2% with the weight loss of the sample being decreased from 1.8% to 0.21%. The mechanism of MoSi₂ improving the oxidation protection of the coatings is revealed. With an increase of the MoSi₂ content, the amount of SiO₂ glass phase in the coating is increased, and the dispersion of Hf-oxide on the surface is improved so that a Hf-Si-O glass layer with high stability is formed and the weight loss of the sample is reduced from 0.46% to 0.08% after 200 h oxidation at 1500 °C in air.
- MoSi₂,
- Coating,
- Oxidation resistance,
- Multiphase glass layer

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References(44)

References

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