The tensile strength of CVD SiC fiber was remarkably improved by electrochemical surface treatment. SEM analyses revealthat AC current treatment could form a more compact and complete SiO2 layer than DC current on the surface of the SiCfiber, which was beneficial to the improvement of tensile strength. It was also verified that AC current was more effective forproducing high performance SiC fiber with SiO2 surface layer than DC current. The frequency is a sensitive parameter for theprocess; but the signals of input current had relatively small effect on the tensile strength of SiC fiber. A further discussionfor this phenomenon was completed. The proposed operational parameters are 0.3 A, 5 kHz of sine wave and 91 m/h of thereceiving rate respectively.
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