Abstract
A study on the wetting behaviour in liquid nickel-based-alloy(L)-substrate-solid-metal(S) systems has been performed by means of a spray-quenching technique using various substrate metals such as copper, nickel and aluminium. An expression calculating the interchange energy ω, corresponding to the interaction energies between solid and liquid metal atoms arising from the formation of the SL interface, with the aid of the heat of mixing of the binary solution composed of the solid and liquid component metals is proposed. The values of ω evaluated by using the expression for the respective substrate metals clearly correlated with those of the specific surface S w and thickness t f of sprayquenched flaky powders; when the ω value decreased (namely, the atomic bonding force in the SL interface increased), the value of S w increased and, in contrast, that of t f decreased. Therefore, the value of ω evaluated in this work may be employed as a criterion for selecting a substrate metal in accordance with desirable characteristics of the quenched products.
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