In order to clarify the fundamental mechanisms of cermet sintering from the view points of surface- and interfacial tensions, the surface tensions of metals and alloys have been investigated experimentally as the first stage. The results obtained are as follows: The surface energy and the surface tension of a pure liquid are estimated with the bonding factor, B, or the surface tension factor, K, which are constants for liquids consisting of the same type of atomic bonding. The values are given by KM÷0.16, KI=0.07, BV=0.5, BM=0.18 and BI=0.10. The suffix V, M and I represent molecular, metallic and ionic liquids respectively.
The surface tension of binary alloy changes in general smooth-concavely upwards with the concentration. If there are some high melting point compounds like silicide in the alloy system, the curve of surface tension vs concentration has a slight break. This fact and the distinct thermal coefficient of surface tension suggest that the dissociation of a compound is imperfect just above the melting point.
It was disclosed that carbon, Mo2C and WC have little effects on the surface tension of iron, cobalt and nickel.
The assumption of adsorption of alloying elements is useful in understanding the surface tension of alloys.
(Received September 17, 1960)
* Published in Japanese: J. Japan Inst. Metals, 24 (1960), 117, 167.
** Faculty of Technology, Tohoku University.
© 2002 The Japan Institute of Metals
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