Abstract: A multi-functional gradient coating of carbon fibers is produced, which has the functions of wetting, relaxing the thermal residual stresses, restricting reaction and diffusion, tailing the fracture mode and oxidation-resistent, that can meet the demands of processing and properties of C-Al composites. The coating has been prepared with chemical vapour deposition method, and the structure and profile of composition were in keeping with the design. The highest tensile strength of samples of C-Al composites with this coating is up to 1220MPa. The properties and functions of this coating is probed.

Key words: Fiber coating, Functional gradient material, Metal matrix composite