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中南大学学报(英文版)

Journal of Central South University

Vol. 12    No. 6    December 2005

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Die wall lubricated warm compaction behavior of
non-lubricant admixed iron powders
YE Tu-ming(叶途明)1, YI Jian-hong(易健宏)1,2, CHEN Shi-jin(陈仕金)3,
PENG Yuan-dong(彭元东) 1, LI Li-ya(李丽娅) 1, XIA Qing-lin(夏庆林)

1. State Key Laboratory of Powder Metallurgy,
Central South University, Changsha 410083, China;
2. Department of Materials, University of Oxford, UK;
3. Portie Yangzhou Industrial Limited Company, Yangzhou 225009, China

Abstract:The phenomena of die wall lubricated warm compaction of non-lubricant admixed iron powders were researched, and its mechanism of densification was discussed. Water atomized powder obtained from the Wuhan Iron and Steel Corporation was used. With compacting and sintering, compared with cold compaction, the density of warm compacted samples increases by 0.07 0.22 g/cm3 at the same pressed pressure. The maximum achievable green density of warm compacted samples is 7.12 g/cm3 at 120℃, and the maximum sintered density is 7.18 g/cm3 at 80℃. Compared with cold compaction, the ejection force of warm compaction is smaller; the maximum discrepancy is about 7 kN. The warm compacted mechanism of densification of iron powders can be obtained: heating the powder contributes to improving plastic deformation of powder particles, and accelerating the mutual filling and rearrangement of powder particles.

 

Key words: powder metallurgy; warm compaction; die wall lubrication; ejection force; mechanism of densification

中南大学学报(自然科学版)
  ISSN 1672-7207
CN 43-1426/N
ZDXZAC
中南大学学报(英文版)
  ISSN 2095-2899
CN 43-1516/TB
JCSTFT
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