材料期刊网

A method of preparing continuous (Al+Al₂O₃)-coated SiC fiber reinforced nickel matrix composite was presented, in which the diffusion between SiC fiber and nickel matrix could be prevented. Magnetron sputtering is used to deposit Ni coating on the surface of the (Al+Al₂O₃)-coated SiC fiber in preparation of the precursor wires. It is shown that the deposited Ni coating combines well with the (Al+Al₂O₃) coating and has little negative effect on the tensile strength of (Al+Al₂O₃)-coated SiC fiber. Solid-state diffusion bonding process is employed to prepare the (Al+Al₂O₃)-coated SiC fiber reinforced nickel matrix with 37% fibers in volume. The solid-state diffusion bonding process is optimized and the optimum parameters are temperature of 870°, pressure of 50 MPa and holding time of 2 h. Under this condition, the precursor wires can diffuse well, composite of full density can be formed and the (Al+ Al₂O₃) coating is effective to restrict the reaction between SiC fiber and nickel matrix.