Surface State of Domestic 800-grade Carbon Fibers and Interface Property of Composites

Abstract

The surface and micro-interface property of three domestic 800-grade carbon fibers (1#, 2#, 3#) were characterized by Scanning Electron Microscope (SEM), Atomic Force Microscope (AFM), X-ray Photoelectron Spectroscopy (XPS), multifilament stretching method and single fiber fragmentation test. The results show that the surfaces of these three fibers are all smooth and the roughness is between 9-17nm. They all possess high content of oxygen, and the ratio of O/C of the three carbon fibers is between 0.23-0.27. The multifilament tensile property is similar, which reveals the domestic carbon fibers have stable quality control, and the breaking elongation rate of about 1.9 revealing that the fiber and resin matrix matching is good. The tensile strength of single fiber is unstable, meanwhile the high tensile surface active functional group has big influence on the interface shear strength of carbon fibers.

Keywords

• domestic 800-grade carbon fiber
• surface
• composite
• interface