AUTHOR=Zhu Liu , Zhang Yu-Xiang , Wang Jin-Fang , Luo Lai-Ma 

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

JOURNAL=Frontiers in Materials

VOLUME=7

YEAR=2020

URL=https://www.frontiersin.org/journals/materials/articles/10.3389/fmats.2020.00136

DOI=10.3389/fmats.2020.00136

ISSN=2296-8016

ABSTRACT=<p>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 SiO<sub>2</sub> and Al<sub>2</sub>O<sub>3</sub> were formed in the coating. Oxidation rate of the Al–Si coating was lower than that of the pure tungsten.</p>