无机材料学报

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连续纤维增韧碳化硅基复合材料内耗特征及机制

张钧; 徐永东; 张立同; 成来飞   

  1. 西北工业大学凝固技术国家重点实验室, 西安 710072
  • 收稿日期:2004-05-27 修回日期:2004-08-13 出版日期:2005-07-20 网络出版日期:2005-07-20

Internal Friction of Continuous Fiber-reinforced SiC-matrix Composites

ZHANG Jun; XU Yong-Dong; ZHANG Li-Tong; CHENG Lai-Fei   

  1. State Key Laboratory of Solidification Processing; Northwestern Polytechnical University; Xi an 710072; China
  • Received:2004-05-27 Revised:2004-08-13 Published:2005-07-20 Online:2005-07-20

摘要: 采用强迫振动法研究了不同应变振幅下C/SiC和SiC/SiC复合材料从室温到600℃的内耗特征,并讨论了其内耗产生机制.结果表明,C/SiC复合材料内耗随温度升高先减小, 后增加,并在120℃附近达到最小值;SiC/SiC复合材料内耗随温度升高一直增加;C/SiC 复合材料具有比SiC/SiC复合材料更高的内耗水平和更低的动态模量;C/SiC和SiC/SiC复合材料内耗随应变振幅增加而减小,但动态模量和应变振幅无关.

关键词: 碳化硅, 复合材料, 内耗

Abstract: The internal friction of C/SiC and SiC/SiC composites was investigated by means of forced vibration from room temperature to 600℃ under different strain amplitude, and the internal friction
mechanism was also discussed. The results show that the internal friction of C/SiC composites decreases at first and then increases with increasing temperature, and the minimum of internal friction occurs
at about 120℃. While the internal friction of SiC/SiC composites increases monotonically with the increase of temperature. C/SiC composites have a higher internal friction value and lower dynamic
modulus than SiC/SiC composites. The internal friction of both C/SiC and SiC/SiC composites decreases when the strain amplitude is increased, while the dynamic modulus of both the composites is independent of the strain amplitude.

Key words: SiC, composites, internal friction

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