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.
The internal friction of C/SiC and SiC/SiC composites was investigated by means of forced vibration from room temperature to 600 degrees C 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 degrees C. 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.
出处
《无机材料学报》
SCIE
EI
CAS
CSCD
北大核心
2005年第4期889-894,共6页
Journal of Inorganic Materials
关键词
碳化硅
复合材料
内耗
SiC
composites
internal friction
