| 摘要 |
PURPOSE: Provided is an iron-based sintered component formed of an iron-based metal powder as a raw material and suitable to machinery parts, or an iron-based powder metal body as an intermediate material suitable to manufacture of the sintered iron-based component. CONSTITUTION: The method comprises: mixing an iron-based metal powder containing at most about 0.05% of carbon, at most about 0.3% of oxygen, at most about 0.010% of nitrogen, with at least about 0.03% and at most about 0.5% of graphite powder and a lubricant; preliminarily compacting the mixture into a preform; preliminarily sintering the preform in a non-oxidizing atmosphere in which a partial pressure of nitrogen is about 30 kPa or less at a temperature of about 1000 deg.C or higher and about 1300 deg.C or lower, thereby forming a sintered iron-based powder metal body with outstandingly lower re-compacting load and having high deformability, the density of which is about 7.3 Mg/m¬3 or more and which contains at least about 0.10% and at most about 0.50 of carbon, at most about 0.010% of oxygen and at most about 0.010% of nitrogen, and which comprises at most about 0.02% of free carbon; and, further applying re-compaction and re-sintering and/or heat treatment thereby forming a sintered component.
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