EFFECT OF OXYGEN ON THE SURFACE TENSION OF LIQUID NICKEL AND THE WETTABILITY OF ALUMINA BY LIQUID NICKEL.

Abstract

The surface tension of liquid Ni-O alloys and the wettability of Al//2O//3 substrates by liquid Ni-O alloys were measured by a sessile drop method in an atmosphere af Ar plus H//2O plus H//2 gas mixtures at 1873 K. The adsorption of oxygen in a surface layer and the adhesion in the liquid Ni-O alloy/Al//2O//3 substrate interface were considered on the basis of experimental results. The surface tension of liquid Ni was found to be greatly lowered with the addition of a very small amount of oxygen.