NDLI: Preparation of Protective MoSi$_{2}$ Coating on Niobium Substrate

Content Provider	Springer Nature Link
Author	Yan, JianHui Wang, Yi Liu, LongFei Wang, Yueming Chen, Fang
Copyright Year	2015
Abstract	A protective MoSi$_{2}$ coating on Nb substrate was prepared by air plasma spraying and annealing followed by siliconizing. The influence of annealing for plasma-sprayed Mo layer on the subsequent preparation of MoSi$_{2}$ coating was investigated. Oxidation behavior of the MoSi$_{2}$ coating was investigated at 1200 °C in air. Phase constituents and microstructure of the MoSi$_{2}$ coating were characterized by x-ray diffraction and scanning electron microscopy. High-temperature annealing significantly decreases the porosity of the as-sprayed Mo coating (from 9.6 to 2.1%). After vacuum annealing, the splat boundaries and lamellar microstructure of the as-sprayed coating disappear and the recrystallized structure of the Mo coating appears. The MoSi$_{2}$ coating falls off from the surface of the as-sprayed Mo coating during siliconizing process. The MoSi$_{2}$ coating prepared on the annealed Mo layer surface has a dense microstructure, which shows a good interface bond between the coating and the Nb substrate. The coating has a multilayer structure, with MoSi$_{2}$ outer layer, Mo middle layer, and Mo-Nb alloy inner layer. The MoSi$_{2}$ coating exhibits an excellent oxidation resistance at 1200 °C in air.
Starting Page	1093
Ending Page	1099
Page Count	7
File Format	PDF
ISSN	10599630
Journal	Journal of Thermal Spray Technology
Volume Number	24
Issue Number	6
e-ISSN	15441016
Language	English
Publisher	Springer US
Publisher Date	2015-06-10
Publisher Place	New York
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	molybdenum coating MoSi$_{2}$ coating oxidation properties plasma spray vacuum annealing Surfaces and Interfaces, Thin Films Tribology, Corrosion and Coatings Characterization and Evaluation of Materials Operating Procedures, Materials Treatment Analytical Chemistry
Content Type	Text
Resource Type	Article
Subject	Surfaces, Coatings and Films Materials Chemistry Condensed Matter Physics

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