Abstract
Packing particles in a permanent mold and forcing melt to flow into the interspace among the particles by pressure casting is considered to be one of the most convenient methods of producing metal-particle composite because of the simpleness of the principle and the procedure of manufacture. In order to clarify the relation between the particle preheating temperature and the length of the composite products, melt of tin, lead or zinc, which was free from superheat, was forced to infiltrate the spherical particle aggregate of glass, copper, lead or carbon, which had been preheated at various temperature, by an oil press. Any combination system of metal and particles has a unique particle preheating temperature, i.e., the critical temperature, only above which the melt can flow long enough to fill out the mold. The liquid volume fraction at the critical temperature, i. e., the critical liquid fraction, was from 0.30 to 0.49. The critical preheating temperature can be expressed in terms of some physical constants of the metal and the perticles and the critical liquid fraction.
