Effect of fiber surface treatment on tensile strength of C/SiC composites

In order to improve interface bonding property between fiber and matrix and the mechanical property of C/SiC composites,three kinds of surface treatment methods were applied to carbon fiber tows.The effects of three kinds of surface treatment methods on tensile strength of C/SiC minicomposites were investigated.The results show that the surface of fiber treated at 1 800 ℃ becomes rough under Ar gas;the tensile strength of treated fiber is 2.4 times that of carbon fiber without treatment;the surface roughness of fiber after CVI PyC treatment becomes small,and the tensile strength is 3.1 times that of the carbon fiber without treatment;the surface of fiber after high-temperature and CVI PyC treatment becomes smooth,and tensile strength attains the maximum value,708 MPa.