Study on production technology and surface morphology of carbon fiber

Abstract

Since the 21st century, China’s carbon fiber industry has begun to develop rapidly. The research and development of carbon fiber is a major project related to national strategic security. Carbon fiber production technology has been mature, among which PAN based carbon fiber has the largest capacity. However, compared with the imported carbon fiber materials, there is still a certain gap in the performance of domestic carbon fiber materials. The purpose of this paper is to compare the properties of domestic carbon fiber and its composites. Firstly, the production process of carbon fiber is introduced, including monomer polymerization, spinning, oiling, preoxidation, carbonization, graphitization and other steps. Then, the T700 Carbon Fibers of Toray, Japan and two kinds of domestic T700 Carbon Fibers of Hengshen and Weihai were characterized and analyzed, and the surface morphology of three kinds of carbon fibers was compared. It is found that the domestic carbon fiber of Weihai adopts the similar technology of thousand spray wet spinning, and the fiber surface is smooth. However, Hengshen carbon fiber adopts the wet spinning process. There are grooves on the surface of the fiber, which will increase the mechanical meshing force between the fiber and the resin, and have a positive significance for the interface performance of the composite. However, it will increase the probability of fiber defects, such as fine lines, and have a negative impact on its tensile properties and other mechanical properties.