摘要
密封是保证航天器发射、运行可靠性及寿命的关键环节之一,随着月球及深空探测技术发展需求,迫切需要解决在极高真空环境下设备的密封技术。本文根据空间环境的适应要求,研制设计一种采用软金属合金作为填料,多层密封材料配合的密封技术。对照空间环境密封漏率指标要求,对密封材料种类、成分配比、微观结构、刀口和预紧力等关键参数进行了分析和实验研究,在高真空条件下通过实验测试了软金属材料密封装置漏率情况和温度环境的稳定性。实验结果表明,软金属材料和基体材料匹配良好,刀口结构密封装置在高真空环境下的漏率小于5×10-11 Pa·m3/s,高低温度循环后漏率稳定,可以满足未来航天器在极高真空环境下的长期稳定可靠密封使用要求。
A novelultra-high-vacuum （UHV） sealing technique was developed to meet the stringent requirements of launching and stable long-term operation of spacecraft. The newly-developed sealing technique involves the multi-layered seal structures and soft metal alloy （In-Ag alloy） seal material. The impacts of major factors, including the seal structrees, type and stoichiometry and microstructures of seal materials, matching of thermal expansion coefficients, pre-tight- ening force on knife edge, seal welds, etc., on the leakage and thermal stability were experimentally evaluated. The seal weld was characterized with scanning electron microscopy and energy dispersive spectroscopy. The newly-developed VHV seal, prepared under the optimized conditions, was tested in high vacuum for 5 high-low temperature cycles. The results show that it is capable of keeping the leak rate below 5 × 10^-11 Pa·m3/s and meeting the requirements of future deepspace survey.
出处
《真空科学与技术学报》
EI
CAS
CSCD
北大核心
2014年第3期221-224,共4页
Chinese Journal of Vacuum Science and Technology
关键词
软金属合金
刀口挤压密封
极高真空
漏率
航天器
Soft metal alloy, Knife edge squeezing seal, Uhro-high vacuum, leak rate, Arospace
