Comparison of mechanical property of unsized T300 and Chinese carbon fibers

In the paper, the differences of unsized T300 and Chinese carbon fibers were studied. The monofilament tensile strengths of the two types of carbon fibers were tested and analyzed by Weibull statistical method. The result showed that the tensile strength of Chinese carbon fibers was higher than that of T300 and the stability of Chinese carbon fibers was better. X-ray diffraction(XRD) patterns showed that the size of minicrystal of T300 was smaller. The degree of graphitization was lower than Chinese carbon fibers. It was also found that the content of N element was less than Chinese carbon fibers in the result of X-ray photoelectron spectroscopy (XPS). So it can be concluded that the size of minicrystal and content of N element can influence the tensile strength of carbon fiber directly.