PRODUCTION OF MOLDED AND SINTERED PARTS OF POWDER

摘要

PURPOSE:To obtain sintered parts of intricate shapes having homogeneous quality and high density by sintering moldings of raw materials powder obtained from female molds of desired shapes molded by using meltable and fusible patterns by a hot hydrostatic pressing method. CONSTITUTION:Slurry prepd. by mixing refractory powder, silicate compds. and dispersion is coated on patterns of desired shapes manufactured of easyly dissolvable or fusible materials and is solidified whereby female mold shells are formed. Said patterns are melted away to obtain female molds having the cavities of the pattern shapes and 10-60% porosities. The slips prepd. by mixing desired metallic raw material powder or ceramic raw material powder and dispersion is charged into the cavities of such female molds. The dispersion in the slips is removed through the walls of the female molds to dry and solidify the moldings of the raw material powder and the moldings are heated up to the m.p. of the silicate compd. in the female mold materials to make the moldings hermetic. Such hermetic moldings are subjected to hot hydrostatic pressing to sinter the moldings under pressure; thereafter, the female molds are removed and the sintered parts are obtained.