中国塑料 ›› 2016, Vol. 30 ›› Issue (11): 69-75 .DOI: 10.19491/j.issn.1001-9278.2016.11.013

• 加工与应用 • 上一篇    下一篇

氧系统单向阀中聚四氟乙烯密封环裂纹分析及改进措施研究

陈慧敏1,李有志2,梁兵1,李堃1,尹雅楠1   

  1. 1. 首都航天机械公司2. 北京航天动力研究所
  • 收稿日期:2016-06-22 修回日期:2016-08-02 出版日期:2016-11-26 发布日期:2016-11-26

Crack Analysis and Modification Method for Polytetrafluoroethylene Sealing Rings in One-way Valves of Oxygen Systems

  • Received:2016-06-22 Revised:2016-08-02 Online:2016-11-26 Published:2016-11-26

摘要: 介绍了航天发动机氧系统单向阀中聚四氟乙烯(PTFE)密封环的主要成型工艺,采用体式显微镜和扫描电子显微镜分别从宏观形貌和微观形貌分析了PTFE密封环裂纹产生的原因。结果表明,采取PTFE粉料过筛处理和冷压预成型过程增加排气措施制备PTFE制品,有效消除了PTFE制品内部存在的空隙缺陷,改进后PTFE制品的拉伸性能优于未经过筛处理且压制过程无排气措施的PTFE制品,提高了航天产品的品质可靠性,满足了航天领域氧系统单向阀活门产品的使用要求。

关键词: 氧系统, 单向阀, 聚四氟乙烯, 密封环, 裂纹

Abstract: This article introduced the major molding processes of polytetrafluoroethylene (PTFE) sealing rings used for the one-way valve of oxygen systems in the space engine. The reasons for the occurrence of cracks in the PTFE seal ring were analyzed in terms of the macroscopic aspect and microscopic morphology. The results indicated that the internal gaps within PTFE seal rings could be effectively eliminated when being prepared by use of sieved PTFE powder under an exhaust condition during the cold-pressing per-molding. The tensile properties of PTFE seal rings were improved significantly as a result of this modification, and hence the reliability of PTFE seal rings was enhanced to meet the requirement of aerospace areas for the one-way valve of oxygen systems.

Key words: oxygen system, one-way valve, polytetrafluoroethylene, sealing ring, cracks