Industrial advances frequently depend on the development of new, special-purpose ma- terials possessing specific magnetic, electrical, optical, strength, friction, antifriction, and other properties. Metal alloys produced by the conventional technique of metallurgical reduc- tion often do not meet these new requirements. Powder metallurgy, therefore, is of consider- able importance in solving many problems of present-day materials science. Its production techniques-solid-phase and liquid-phase sintering, impregnation, hot pressing - make it pos, ... sible to obtain materials from metallic...