Effects of Interphase Thickness on Damping Behavior of 2D C/SiC Composites


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Internal friction of 2D C/SiC composites fabricated by chemical vapor infiltration (CVI) method was measured by dynamical mechanical analysis (DMA) at different frequencies from room temperature (RT) to 400°C in air atmosphere. Internal friction of 2D C/SiC composites increased gradually with increasing temperature and then decreased after damping peak appeared in the temperature range of 250°C to 300°C. Damping capacity and peak value decreased gradually with increasing frequency, accompanied with a shift of damping peak towards lower temperatures. Moreover, the effect of interphase thickness on damping behavior of 2D C/SiC composites was investigated. The results showed that damping peak of the composites increased gradually and the temperature of the peak shifted to the lower temperature with increasing PyC interphase thickness, when the interphase thickness is in the range of 90~296nm. The influence of interphase thickness on interfacial bonding strength, sliding resistance and the microstructure of SiC matrix was discussed, which was considered to be responsible for the results.



Materials Science Forum (Volumes 546-549)

Edited by:

Yafang Han et al.




Q. Zhang et al., "Effects of Interphase Thickness on Damping Behavior of 2D C/SiC Composites", Materials Science Forum, Vols. 546-549, pp. 1531-1534, 2007

Online since:

May 2007




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