Study on Interface of the SiCf/Ti600 Composite

The SiC fiber reinforced Ti600 composite is fabricated by Matrix Coated Fiber (MCF) and Hot Isostatic Pressing (HIP). After the samples are treated by thermal exposure in vacuum under different condition of time and temperature, the primary study is performed on the kinetics of interfacial reaction, the phase of interfacial reaction products and reaction order by means of SEM, EDS and XRD. The results show that the content fluctuation of reactive elements such as C, Ti and Si appears in interfacial reaction layers. Alloying element Al in matrix does not remarkably diffuse into interfacial reaction zone, but piles up in front of the matrix-reaction layer interface. and the interfacial reaction products are identified as TiC, Ti5Si3 and Ti3SiC2 in SiC/Ti600 composite. The interfacial reaction layer growth is controlled by diffusion and follows a role of parabolic rate, and the activation energy Q(k) and k(0) of SiC/Ti600 composite are 266.46 kJ.mol(-1) and 1.37x10(-3) m.s(-1/2), respectively.