Research on mechanical behavior of 2D C/SiC composites at elevated temperature under uniaxial compression

The quasi-static and dynamic compression mechanical behaviors of a kind of 2D C/SiC composite were investigated at temperatures ranging from 293 K to 873 K using the electronic universal testing machine and the split Hopkinson pressure bar. The experimental results show that the material still has a good carrying capacity even at the elevated temperature. The compressive strength of the composite at 873K decreases by only 10% comparing with that at 293 K. The catastrophic brittle failures were not observed under both quasi-static and dynamic loading. It has been found through analysis that the decrease in carrying capacity of 2D C/SiC composite at elevated temperature is probably due to two reasons: the first one is the residual stress between the two phases because of the different coefficient of heat conductivity, and the second one is the effect of oxidation, which is considered as the more dominating reason of the softening behavior of 2D C/SiC composite at elevated temperatures.