conversion is carried out at only the deformed region with which the ceramic particles collide so that the temperature of the workpiece rises locally it appears that at this time the surface of the metal workpiece is heated and softened so that the ceramic particles are dispersed into the workpiece it also appears that next a coating metal powder is ejected so that the coating metal powder is heated in the same manner as in the case of the ceramic particles and then diffuses and penetrates inside onto the ceramic dispersed layer on the surface of the workpiece when the ceramic particles are dispersed inside onto the surface of the workpiece the heat resistance and wear resistance of the surface of the workpiece are improved the metal coat is further formed on the surface of the ceramic dispersed layer so that lubrication is also gained at this time however the thermal conductivity of the workpiece is reduced by the ceramic particle dispersed layer thus the temperature of the coating metal powder is liable to rise on the surface of the workpiece so that the coating metal powder easily diffuses and penetrates conventionally in order to form a metal coat on the surface of a workpiece by blasting treatment it is necessary that the hardness or the melting point.