PAN계 탄소섬유의 안정화 체류시간과 미세구조 및 기계적 물성의 상관관계

Abstract

For Polyacrylonitrile (PAN)-based carbon fiber to have high-mechanical properties, the heat-treatment processes including three-step (such as stabilization, carbonization, and graphitization) are important. The stabilization process, one of the most important processes, is essential for transformation from the nitrile functional groups in PAN-based precursor to ladder structure, and it also can increase in high thermal stability. In this research, the PAN-based precursor fiber was stabilized using a continuous heat treatment facility that had many variables (residence time, strain rate, temperature, etc.) that could be controlled to optimize the stabilization process. Also, the mechanical properties affecting the stabilization process were studied especially for the change in residence time among many heat-treating variables because residence time is easy to correlate between mechanical properties than other variables. For the high-performance carbon fibers manufacturing process, the correlation between the stabilization residence time and the mechanical properties of the carbon fiber was analyzed using tensile tests and wide-angle X-ray diffraction. As a result, the residence time of the stabilization was tended to be proportional to the tensile modulus of carbon fiber affected by the fiber orientation.