| 摘要 |
PROBLEM TO BE SOLVED: To provide a method for stably producing an iron-based compacted body having a high density and thus an iron-based sintered body having a high strength and a high density. SOLUTION: The method comprises pre-compacting an iron-based mixed powder prepared from an iron-based metal powder and a graphite powder, or further, a lubricant, pre-sintering the resulting pre-compacted body at a temperature of higher than 1000°C and not higher than 1300°C in a nonoxidizing atmosphere under the partial pressure of nitrogen satisfying≤30 kPa, to prepare an iron-based sintered preform having a composition containing 0.10 to 0.50 mass% of C, 0.3 mass% or less of O and 0.010 mass% or less of N, and the balance Fe with inevitable impurities and having a density of 7.2 Mg/m<SP>3</SP>or more, and then subjecting the preform for compacting high density iron-based powder to a high velocity compaction at a ram velocity of≥2 m/s. COPYRIGHT: (C)2007,JPO&INPIT
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