97/00268 Suppression of scale formation during primary hydrogenation of Victorian brown coal. (1). Effect of thermal treatment in solvent on scale form

Abstract

The oxidation behavior of single-phase γ, single-phase Laves, and two-phase γ + Laves TiAlCr alloys was investigated at 1000°C in air. The addition of 4–5 at % Cr to the γ phase resulted in protective alumina scale formation in dry air, but titania-based nodule formation in humid room air. Two-phase γ + Laves alloys exhibited protective alumina scale formation in both dry air and humid room air. The difference in oxidation behavior between γ and γ + Laves alloys was interpreted in terms of compositional changes at the alloy/scale interface during oxidation.