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Compaction as a Critical Factor for Success in the Sintering of Ultra-Fine WC–Co Powders

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Heat treatment of ultra-fine WC–13Co powders was carried out prior to cold compaction, in an attempt to improve the sintered density. The findings indicate that a preheat treatment of ultra-fine or nano-sized powders significantly improves the densification process. This study showed that a low compacting pressure, <200 MPa, can be effectively used through this technique to retain ultra-fine structure. The densification behavior of preheated powder was compared with the samples prepared by a conventional technique and explained with size distribution, standard deviation, and surface effect.
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Document Type: Research Article

Affiliations: School of Materials Science and Engineering, Seoul National University, Seoul 151-742, Korea

Publication date: November 1, 2005

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