Interdiffusion involved in SHS welding of SiC ceramic to itself and to Ni-based superalloy
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文摘
In order to reach a better understanding of the mechanism of joining of SiC ceramic to itself and to Ni-based superalloy by pressure-aided self-propagating high-temperature synthesis (SHS) welding process, microstructural study and energy dispersive X-ray microanalysis (EDX) were carried out with the welded samples. The wettability between SiC ceramic and the liquid reaction products of the filler is very good. A composition transition layer forms at the SiC/filler interface mainly due to the diffusion of Ti from the filler to the ceramic. The affinity between Ti and SiC is better than that between Ni and SiC. The components of the Ni-based superalloy remarkably diffuse into the reaction products of the filler. The microstructure shows an excellent bonding at the interfaces.