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- Title
Characterization of the Gradient (Mo, Re)Si<sub>2</sub>/Mo-Re Coatings Deposited in the Hybrid Process.
- Authors
Moskal, Grzegorz; Migas, Damian; Osadnik, Małgorzata; Wrona, Adriana
- Abstract
Novel siliconized Mo-Re coatings dedicated to applications in the glass industry are shown in this paper. The study aims at the characterization of morphology, phase composition, and oxidation behavior of siliconized Mo-based coatings deposited on a ceramic–metal substrate. Two coatings with different contents of rhenium were prepared using a hybrid process that includes atmospheric plasma spraying and pack siliconizing. The microstructure, chemical, and phase composition of the obtained coatings were characterized and compared to Mo coating. Moreover, a characterization of starting powders was performed. After the description of the coatings' microstructure, oxidation tests were carried out at 1000, 1100, and 1200 °C. The surface condition of oxidized coatings was investigated. The structure of Re-containing coatings after the siliconizing process was comparable. Both were composed of Mo and (Mo,Re)Si2-ReSi1.75 layers. However, in the case of Mo-44Re (wt.%) coating, a higher concentration of rhenium silicide was observed compared to that of coating containing 15% Re. The Re-containing silicide layers were characterized by a presence of lower content of hexagonal MoSi2 compared to that of non-alloyed MoSi2. The oxidation resistance of both coatings containing rhenium was comparable; however, the one with a higher amount of Re exhibited slightly higher durability in high-temperature oxidation.
- Subjects
MOLYBDENUM disilicide; SURFACE coatings; PLASMA spraying; PROTECTIVE coatings; METAL spraying; GLASS industry; HYDROGEN evolution reactions
- Publication
Journal of Thermal Spray Technology, 2019, Vol 28, Issue 7, p1532
- ISSN
1059-9630
- Publication type
Article
- DOI
10.1007/s11666-019-00909-6