Research Progress on Joining of SiC Ceramics and Its Composites Using SiC as Major Phase of Joining Layer

SiC ceramics are difficult to be directly processed into large and complex components due to their high brittleness, high hardness and high wear resistance. Therefore, joining technology is one of the developed methods to facilitate the engineering application of SiC ceramics. Among various joining methods, the joints obtained by the joining method using SiC as a major phase of the joining layer have some advantages like high joint strength, low joint stress, radiation resistance, chemical corrosion resistance and high temperature resistance, thus becoming the key technologies for SiC ceramic joining, i.e., nano-infiltrated transient eutectoid phase joining (i.e., NITE phase joining), silicon-carbon reaction joining (i.e., Si—C reaction joining) and precursor joining. This review represented three kinds of SiC ceramic joining technologies above using SiC as a major phase of the joining layer from the aspects of joining mechanism, joining process, joint composition, microstructure and joining strength. The advantages and deficiencies of the three kinds of joining technologies were analyzed and compared. In addition, the future development was also prospected.