Submicron Corrugation оf Polyacrylonitrile-Based Carbon Fiber under High-Fluence Ion Irradiation
Submicron corrugation of the surface of non-graphitized (heat treatment temperature 1400°C) and graphitized (heat treatment temperature 2800°C) Zoltek PX35 carbon fibers from polyacrylonitrile by high-fluence irradiation with nitrogen and argon ions with an energy of 30 keV has been carried out. The microgeometry of the surfaces of non-graphitized and graphitized carbon fibers irradiated with nitrogen ions is characterized by the presence of corrugations with different periods and heights at the same inclination of their faces. The similarities and differences in the microstructure of the carbon fiber surface layer after heat treatment and ion irradiation according to Raman spectroscopy data are analyzed and discussed. The data obtained allow suggesting an increase in the tensile strength of the modified carbon fiber layer with a decrease in the elastic modulus. The reasons and conditions for corrugation of carbon fibers under ion irradiation are discussed.