PURPOSE: To obtain a poreless composite metallic material having uniform quality by putting a preform consisting of a reinforcing material and base metal block into a container, deaerating and hermetically closing the container, heating the container to melt the base metal block, putting the container into a mold and pressurizing the same.
CONSTITUTION: The preform 1 consisting of the reinforcing material and the block 2 of the base metal are put into the container 3 and a cap 30 is put thereon. The container is then deaerated and hermetically closed. The preform and block are heated together with the container 3 to melt the block 2 and thereafter the container 3 is put into the mold 4 such as casting mold and is pressurized by a ram R. The molten metal 2' is impregnated into the preform 1 by such pressurization. Since both the preform 1 and the base metal 2 are in a vacuum in the container 3 during this time, there is no room for foam to remain. Even if the cap 30 is broken during the pressing, the pressing is for a short time and therefore, the intrusion of the foam into the material of obviated. The material is cooled after the pressurized pressing and if necessary, the material is subjected to surface machining and heat treatment, by which the product is obtd.
FUKUMOTO TADASHI
KAMATA SHOSEI
KURITA YOSHIYUKI
