Study on Interface Reaction Between 2D C/SiC Composite and Mo
The interfacial chemical reaction of 2D C/SiC-Mo reaction couples was investigated at 1700 ℃ in Ar atmosphere.The composition and microstructure of the interface layer were characterized by XRD,EDS and SEM.The reaction mechanism was discussed.The effects of interfacial residual stress on the thermal mismatch of the reaction couple were also analyzed.The results show that the interfacial reaction products mainly consist of Mo2C,Mo5Si3 and Mo5Si3C,and the diffusion path can be summarized as Mo/Mo2C/Mo5Si3/Mo5Si3C/SiC;the interfacial chemical reaction is controlled by mutual diffusion of the elements,and the diffusion rate constant K0 is 1.05 μm2/s at 1700 ℃;the interface debonds after cooling,because the great residual stress occurs due to the CTE mismatch of the two materials in the reaction couples.