CO2-LASER-ASSISTED DEPOSITION OF CARBON COATING ON THE SURFACE OF CARBON-FIBERS

Pyrolytic carbon deposition on carbon fibers (CF) is a promising method for modifying the surface characteristics of the fiber. There have been a number of reports discussing carbon pyrolysis with the assistance of a laser. The authors have developed a laser-assisted method of carbon deposition on the surface of continuously pulled yarn in methane. In this case, the fiber is placed in a laser affected zone for a short period of time which does not cause any damage. Fibers in the form of planar bundles were irradiated on both sides through double rewinding. Yarn breaking strength and breaking load were measured before and after irradiation. Fiber adhesion was measured by interlaminar shear strength of an epoxy composite produced from irradiated and original fibers: shear strength was measured by the short beam shear test. The treatment does not reduce the fiber strength; instead, the strength increases.