PRODUCTION HIGH-DENSITY SINTERED BODY

摘要

PURPOSE:To easily produce a high-density sintered body by sticking fine powder having the same compsn. as the compsn. of raw material powder forming a green compact to the surface of the compact and subjecting the compact to presintering in a nonoxidizing atmosphere, then to a hot isostatic press treatment. CONSTITUTION:For example, Fe-Si alloy powder 4 having <=44mu grain size is compacted under 2t/cm<2> pressure to produce the columnar compact 1 sized phi10X10mm. This compact 1 is immersed into ethyl alcohol dispersed with fine Fe-Si alloy powder 5 having <=16mu grain size and is dried so that the fine powder 5 is stuck to the surface. This compact is presintered for one hour at 1400 deg.C in a vacuum or inert atmosphere to substantially eliminate the open pores of the compact. This compact is further sintered by hot isostatic press treatment for one hour at 1400 deg.C and under 2000atm. The high-density sintered body is obtd. by this method with the hot isostatic press which eliminates the labor for glass coating.