MAKING OF PRESSURE-MOLDED PRODUCT FROM ALUMINUM POWDER

摘要

A method of making a pressure-molded product from aluminum powder through the process that aluminum powder is brought into contact with fluoric gas while heated so as to form a fluoridized film on the surface of said aluminum powder and then subjected to pressure molding immediately after removal of the fluoridized film on said surface. Thus, a passive film such as an oxide film on the surface of alumium powder turns into a fluoridized film to protect said surface. Even with the lapse of time between formation and removal of a fluoridized film, the fluoridized film formed on the surface of aluminum powder protects said surface and consequently prevents an oxide film from being formed on said surface again. Since the fluoridized film is decomposed and removed immediately before pressure-molding, it is not necessary to heat aluminum powder containing a mixture of various kinds of powder materials before pressure-molding.