Research of Porous Silicon Nitride Airtight Coating

被引：0
|
作者：
Kan G. [1 ]
Lin C. [1 ]
Liu B. [1 ]
Zhou Y. [1 ]
Zhang X. [1 ]
机构：
[1] China Science and Technology on Space Physics Laboratory, China Academy of Launch Vehicle Technology, Beijing
来源：
Cailiao Daobao/Materials Reports | 2022年 / 36卷 / 13期
关键词：
porous silicon nitride; radome; rate of gas leakage; sealing coating; wind tunnel;
D O I：
10.11896/cldb.21010060
中图分类号：
学科分类号：
摘要：
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. © 2022 Cailiao Daobaoshe/ Materials Review. All rights reserved.
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