无机材料学报

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炭/碳化硅复合材料在高温燃气环境中的铰链传动与摩擦行为

张亚妮, 张立同, 成来飞, 徐永东   

  1. (西北工业大学材料学院超高温结构复合材料国防重点科技实验室, 西安 710072)
  • 收稿日期:2007-06-13 修回日期:2007-08-23 出版日期:2008-05-20 网络出版日期:2008-05-20

Transmitting and Friction Behavior of a Carbon/silicon Carbide Composite Hinge in High Temperature Combustion Environment

ZHANG Ya-Ni, ZHANG Li-Tong, CHENG Lai-Fei, XU Yong-Dong
  

  1. (Department of Materials Science, National Key Laboratory of Thermostructure Composite Materials, Northwestern Polytechnical University, Xi’an, 710072, China)
  • Received:2007-06-13 Revised:2007-08-23 Published:2008-05-20 Online:2008-05-20

摘要: 采用化学气相渗透法(CVI)制备了二维炭纤维增强碳化硅(C/SiC)全陶瓷基复合材料铰链试样. 高温燃气风洞实现了铰链试样在1800℃高温氧化气氛中传动与摩擦行为的试验模拟. 基于耦合应力等效模拟系统的开发, 采用摩擦力矩的变化表征材料的传动与摩擦行为. 对比分析了材料在室温与高温下以传动为背景的高载荷、低转速摩擦磨损行为及机理. C/SiC复合材料铰链试样在高温燃气环境中稳定的摩擦力矩和对滑动时间的不敏感, 验证了材料在高温下更稳定、更可靠的高温摩擦性能及热承载能力. 高温下表面生成的氧化反应膜通过应力的重新分布起到有效的保护与润滑作用.

关键词: 炭/碳化硅(C/SiC)复合材料, 化学气相渗透(CVI), 摩擦, 传动, 高温燃气环境

Abstract: An all-ceramic hinge based on the two dimensional carbon fiber reinforced silicon carbide matrix (C/SiC) composites was prepared by chemical vapor infiltration. The high temperature combustion wind tunnel realized simulation of the transmitting and friction behavior of the hinge at 1800℃ in an oxidizing atmosphere. Based on the coupling stress equivalent simulation system, a characterization method with the change of torque was proposed to evaluate the friction behavior. The friction and wear behavior as well as wear mechanism were studied both at high temperatures in combustion environment and at room temperature in air. The results indicate that the friction torque is stable and insensitive to the sliding time at high
temperatures, which demonstrates stable and reliable friction property and thermal load-carrying ability of the hinge. The
tribochemical reaction products on contact surface may moderate the stress distribution by providing a reaction layer for wear protection and lubrication.

Key words: carbon/silicon carbide composites, chemical vapor infiltration, friction, transmitting, high temperature combustion environment

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