Formation of Bridges Between Diamond Particles During Sintering in Molten Cobalt Matrix

Large diamond particles of approx 700 mu m size mixed with 70 wt.% fine cobalt powder have been sintered at 5.25 GPa and 1500 deg C after wrapping in Zr foil. During the sintering treatment, faceted inter-particle bridges form, and their pale yellow colour, in contrast to the dark yellow colour of t...

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Published inJournal of materials science Vol. 27; no. 17; pp. 4695 - 4697
Main Authors Park, J-K, Eun, K Y, Akaishi, M, Yamaoka, S, Fukunaga, O, Yoon, D N
Format Journal Article
LanguageEnglish
Published 23.09.1990
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Summary:Large diamond particles of approx 700 mu m size mixed with 70 wt.% fine cobalt powder have been sintered at 5.25 GPa and 1500 deg C after wrapping in Zr foil. During the sintering treatment, faceted inter-particle bridges form, and their pale yellow colour, in contrast to the dark yellow colour of the original diamond particles, indicates that the bridge is a new phase reduced in nitrogen content because of the gettering effect of the Zr foil. The morphological characteristics of the bridge and the adjacent particles indicate that the bridge is formed by migration of the inter-particle grain boundary and solution--reprecipitation through the liquid Co matrix. It is possible that these processes are induced by the coherencey strain energy produced by N diffusion from the region ahead of the retreating boundaries, as has been observed in metal systems.
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ISSN:0022-2461