采用电化学方法表面处理用ＣＶＤ法制备的高强度ＳｉＣ纤维，研究了ＳｉＣ纤维的阳极极化 曲线，提出了新的阳极反应机制，吸附在阳极表面的ＯＨ－离子通过前置反应生成中间产物Ｏ－，这个中 间产物破坏Ｃ原子与Ｓｉ之间的化学键，形成Ｓｉ－Ｏ键后再相互连接构成表面膜．如果反应时间过长，则 一些表面的Ｓｉ原子与基体上的碳原子Ｃｂ之间的化学键会被破坏，表面层会因膨胀而脱落 Electrochemical method of surface treatment of high strength SiC fibers prepared by CVD, the anodic polarization curve of SiC fibers, a new anode reaction mechanism was proposed, the OH-ions adsorbed on the anode surface through the pre-reaction to generate the intermediate product O -, This intermediate product destroys the chemical bond between the C atom and Si, Si-O bond formation and then connected to form a surface film. If the reaction time is too long, the chemical bonds between some of the surface Si atoms and the carbon atoms on the substrate Cb will be destroyed, and the surface layer will fall off due to swelling