PHASE COMPOSITIONS AND MICROSTRUCTURES OF THE SiC/Ni3Al INTERFACE SOLID STATE REACTION ZONE

After the SiC/Ni3Al couple heating at 1 000 ℃ for 5 h,the phase compositions and microstructures of the reaction zone were studied using SEM,XRD and EDS. The results show that the SiC/Ni3Al interface solid state reaction zone is composed of Ni2Si,graphitic carbon precipitates and Ni5.4AlSi2. The reaction zone,about 16 μm in thickness,is consisted of two layers,i.e.,the layer of Ni2Si,Ni5.4AlSi2 and graphitic carbon adjacent to the SiC side and the layer of Ni2Si and Ni5.4AlSi2 adjacent to the Ni3Al side.