| The effects of alloying addition on the wetting of graphite and industrial diamond were, studied using sessile drop tests conducted in Ar-atmosphere at 1,100℃. Alloy systems used in this work were Cu-Mn-Sn. Cu-Mn-V and Cu-Mn-Cr. For all of these alloys, wetting of graphite and industrial diamond were found to be improved by increases in the content of carbide formers such as Mn, V and Cr. Among them, Cr was the most effective one. This result was consistent with earlier observations that the wettability of carbon-based materials was strongly dependent upon Gibb’s free energy of formation for carbides involved. The expected increase in activity of the melts, however, was not found in the Cu-Mn-Sn alloys. In the Cu-Mn-V and the Cu-Mn-Cr alloys, the effect of Mn on wettability was different in that Mn was beneficial in the former, while not in the latter alloys. |
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