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Effects of lubrication procedure on the consolidation, sintering and microstructural features of powder compacts

✍ Scribed by A. Simchi


Publisher
Elsevier Science
Year
2003
Weight
676 KB
Volume
24
Category
Article
ISSN
0261-3069

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✦ Synopsis


The role of lubrication procedure on the consolidation behavior of metallic powders and subsequent microstructural development during sintering was investigated. Iron powder and iron-0.8 wyo graphite powder mixture were used as model materials. The effects of die wall lubrication procedure were compared to the traditional admixed powder lubrication method. The influences of manufacturing parameters such as the compacting pressure in the range of 150-800 MPa and the sintering temperature from 400 to 1300 8C were studied. It was found that the lubrication procedure has a great influence on the consolidation and microstructural features of the materials investigated. Admixed lubricant aids the densification in the low-pressure region but limits the maximum density at high pressure. On the other hand, die wall lubrication offers the possibility of achieving the required density in single pressing for parts made by conventional double pressing and double sintering route or by warm compaction technique. The method also results in the formation of more metalymetal contacts during compacting, which leads to better green strength. Moreover, during sintering at moderate temperatures the area of metallic contacts is more and stronger compared to the powder lubricated specimens. Consequently, better mechanical properties are obtained. However, after sintering at a high temperature () 1000 8C) only less total porosity of the unlubricated compacts attributes to higher performance.


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