High-Performance Al–Si Coatings Toward Enhancing Oxidation Resistance of Tungsten by Halide-Activated Pack Cementation

Abstract

An aluminide–silicide coating was prepared on a pure tungsten substrate by halide-activated pack cementation. Thickness, morphology, and phase structure of the Al–Si coating were systematically investigated. Thermal cyclic oxidation tests of the Al–Si coating were carried out at 1,000°C. The results revealed that the aluminide and silicide coating possessed relatively high cyclic oxidation resistance against high temperature. After oxidation, dense SiO2 and Al2O3 were formed in the coating. Oxidation rate of the Al–Si coating was lower than that of the pure tungsten.