Machinability after the sintering it is superior in mechanical characteristics, iron basic mixed powder null for metal ceramic

摘要

PURPOSE:To manufacture ferrous mixed powder for powder metallurgy having excellent machinability and mechanical property after sintering by blending MgO-SiO2 series compound oxide powder specifying compositing component ratio and average particle size with the ferrous raw material powder at the specific ratio. CONSTITUTION:The powder having 3-20mum average particle size and composing of MgO-SiO2 series compound oxide in the range of 1.0-3.0 the value of MgO/ SiO2 in mol ratio, is blended with the ferrous raw material powder at the ratio of 0.1-1.5wt.% to prepare the ferrous mixed powder for powder metallurgy. By using ferrous mixed powder, the sintered machinery part having excellent machinability is obtd. as holding to the same degrees of dimensional variation and mechanical property after sintering as the conventional iron powder without any damaging to brick in a sintering furnace and exothermic body.