期刊
SURFACE & COATINGS TECHNOLOGY
卷 206, 期 15, 页码 3393-3398出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.surfcoat.2012.01.062
关键词
Coatings; Aluminium; Silicide; Pack cementation; Chemical vapor deposition
Formation of aluminium (Al) doped molybdenum di-silicide (MoSi2) coatings was studied to improve the high temperature oxidation behavior of TZM (Mo-0.5Ti-0.1Zr-0.02C) alloy. The pack composition of the halide activated pack cementation process was successfully optimized to form suicide and Al doped silicide coatings on the TZM alloy substrates. Mo(Si, Al)(2) phase was found to form at the outer layer of the coating prepared by doping Al in MoSi2. A change in composition of the phases with increase in coating temperature was detected with Al doping, whereas un-doped silicide coating process was dominated by the formation and growth of MoSi2 phase. Oxidation test and the characterization studies using SEM, EDS, XRD, and microhardness measurements indicated the improved performance of Al doped sill-tide coating during high temperature oxidation in dry air due to the formation of the protective alumina scale. (C) 2012 Elsevier B.V. All rights reserved.
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