There is a pair of contradiction between wear-resistance and obdurability: high rigidity can increase wear-resistance, but lower the obdurability and depress the safety; contrarily, if we strengthen the obdurability, hardness may be depressed and lower the wear-resistance. So simplex traditional material cannot resolve this contradiction. One of the best ways to resolve the problem is the selection of composites, and steel matrix composites rinforced by particulates are the most effective method in solving ...