主要对比分析了机械加工、高压水射流加工、激光加工的3种不同加工工艺对SiCf/SiC复合材料表面形貌的影响。结果显示机械加工与高压水射流加工表面孔洞和微裂纹均较多，水切割表面呈现出纤维拔出状态；空气环境中激光加工的表面平整，出现了封孔特征，孔洞和微裂纹数量少，氮气环境中激光加工的表面形貌生长了一层SiC晶粒，可起到愈合表面孔洞和微裂纹的作用。%Machining process, high-pressure water-jet machining process,laser processing are used on SiCf/SiC composites to obtain the machined surface,the ef-fect of processing on the surface morphology is analyzed . The result shows that the inherent pores are exposed on the machined surfaces by water-jet machining process and machining process and the initial micro-cracks grow on the surfaces. A smooth surface coated by SiOx with a few of micro-cracks is obtained after laser processing in air environment with the vanishing of part of the in-herent pores, which proves that a sealing effect on SiCf/SiC composites treated by laser processing. A similar ef-fect is observed on the surface of sample cutted by laser processing under inert gas. SiC grain deposites on the surface of composites to form a SiC layer, which plays a role in sealing the inherent pores.
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