多孔氮化硅气密涂层技术研究

doi:10.11896/cldb.21010060

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Abstract Porous silicon nitride ceramics have the characteristics of high strength, high modulus, high temperature resistance, oxidation resistance, wear resistance and low dielectric constant. It can be used as a kind of ceramic wave transmission material for missile radome. In order to prevent the high temperature gas stream entering the missile, it is necessary to seal pore structure of the porous silicon nitride. In this work, the coating mainly contained α-Si₃N₄ and β-Si₅AlON₇ with the thickness of 20 μm. Gas leakage rate test and arc wind tunnel test were carried out to verify the air tightness of the sealing coating. The results show that in the high temperature and pressure environment, the sealing coating can ensure no air leakage, and the air tightness modification design of porous silicon nitride is realized. Under the denudation of hypersonic air flow, the sealing coating surface is intact without stripping phenomenon. In the aerodynamic heating environment, the air tight coating technology can solve the air tight problem of porous silicon nitride radome of aircraft, which has great value for its popularization and application.

Key words： porous silicon nitride radome sealing coating rate of gas leakage wind tunnel

Published: 10 July 2022 Online: 2022-07-12

CLC number:

TB34

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	Articles by authors
	KAN Guojin
	LIN Chaoguang
	LIU Bo
	ZHOU Yu
	ZHANG Xiaochen

Cite this article:

KAN Guojin,LIN Chaoguang,LIU Bo, et al. Research of Porous Silicon Nitride Airtight Coating[J]. Materials Reports, 2022, 36(13): 21010060-7.

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http://www.mater-rep.com/EN/10.11896/cldb.21010060 OR http://www.mater-rep.com/EN/Y2022/V36/I13/21010060

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