In metal powder injection molding modulo, control manner null of the carbon content and the oxygen tonnage of the compact which is degreased

摘要

PURPOSE: To control the carbon quantity and oxygen quantity of a degreased molding prior to a sintering treatment with good accuracy in the case of production of products which are strictly limited in the carbon quantity and oxygen quantity, like mechanical parts, by an injection molding method for metallic powder. ;CONSTITUTION: The degreased molding is subjected to a heat treatment in a temp. region of ≥500°C to below the temp. at which sintering progresses and closed holes are formed in gaseous hydrogen of ≥-30°C to ≤40°C dew point of the gas and ≥1vol.% content of gaseous carbon monoxide or in gaseous hydrogen of ≤0°C dew point of the gas and ≥1vol.% content of gaseous hydrocarbon.;COPYRIGHT: (C)1994,JPO&Japio