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铁道科学与工程学报

JOURNAL OF RAILWAY SCIENCE AND ENGINEERING

Vol. 12    No. 6    December 2002

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Die wall lubricated warm compaction of iron-based
powder metallurgy material
NGAI Tungwai Leo(倪东惠), CHEN Wei-ping(陈维平),XIAO Zhi-yu(肖志瑜),
WEN Li-ping(温利平),WU Yuan-biao(吴苑标)

College of Mechanical Engineering,South China University of Technology,
Guangzhou 510640, China

Abstract:Lubricant is harmful to the mechanical properties of the sintered materials. Die wall lubrication was applied on warm compaction powder metallurgy in the hope of reducing the concentration level of the admixed lubricant. Iron-based samples were prepared by die wall lubricated warm compaction at 175℃, using a compacting pressure of 550MPa. Emulsified polytetrafluoroethylene(PTFE) was used as die wall lubricant. Admixed lubricant concentration ranging from 0 to 0.5% was tested. Extremely low admixed lubricant contents were used. Results show that in addition to the decrease in ejection forces, the green density of the compacts increases with the decrease of admixed lubricant content until it reaches the maximum at 0.06% of lubricant content, then decreases with the decrease of admixed lubricant content. The mechanical properties of the sintered compacts that contain more than 0.06% admixed lubricant are better than those of the samples that contain lesser lubricant. No scoring was observed in all die wall lubricated experiments.

 

Key words:   warm compaction; die wall lubrication; powder metallurgy iron-based material

ISSN 1672-7029
CN 43-1423/U

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