The wettability and adherence of metal–ceramic systems were investigated, using a precise sessile–drop method. The surface tension and wettability of silicon, iron, and nickel in contact with various refractory materials were evaluated at elevated temperatures. Measurements were carried outin vacuo, in hydrogen, and in helium. Generally, nonwetting contact angles were observed for iron and nickel with oxides, whereas silicon was found to wet the oxides partially. In all cases the wettability was greater for the metal‐graphite and beryllium carbide systems than for the metal‐oxide systems. The nature of the atmosphere was found to have a significant effect on the wettability and surface tension of the metal. Wettability results are interpreted on the basis of surface tension and by the consideration of free‐energ