Special Processing Techniques Commonly Used For Silicon Carbide Ceramic-Based Composites: Review

Silicon carbide ceramic matrix composites（SiC-CMC） have many advantages, such as high hardness, high strength, high temperature resistance, corrosion resistance etc, showing great application potential in aerospace, nuclear industry, braking system.However, the characteristics of anisotropy, heterogeneity and hard brittleness of SiC-CMC make it very difficult to process. The traditional machining method has some problems such as difficult to control the surface quality, serious tool wear and low machining efficiency. In order to solve the above problems, special processing technology was tried to adopt machining SiC-CMC. However,there are many kinds of special processing technology, which involves more knowledge than traditional processing technology, wide and miscellany. In this paper, laser machining, abrasive water jet machining and electric discharge machining, which are of higher engineering practical value and stronger foundation, are selected to carry out a review. Firstly, the problems of three kinds of special processing technology are introduced and then the methods to solve the problems are summarized. Finally, the advantages and disadvantages of the three are compared and the conclusions are drawn: special processioning technology has its own advantages,laser machining is suitable for machining micro-pores, micro-grooves and other micro-textures; Abrasive water jet machining has higher processing efficiency and can process large complex components. EDM equipment investment is cheap, good at processing thin-plate components and deep cavity groove. Special processioning techniques are neither exclusive nor substitutes for each other,but should complement each other and give play to their advantages to produce complex components with high efficiency and precision.