NDLI: Effect of Spraying Powders Size on the Microstructure, Bonding Strength, and Microhardness of MoSi$_{2}$ Coating Prepared by Air Plasma Spraying

Content Provider	Springer Nature Link
Author	Yan, Jianhui Liu, Longfei Mao, Zhengyu Xu, Hongmei Wang, Yueming
Copyright Year	2014
Abstract	Molybdenum disilicide (MoSi$_{2}$) coatings were deposited on carbon steel by air plasma spraying technology with different feedstock powder sizes (i.e., powder A: −15 + 2.5 μm, powder B: −30 + 15 μm, powder C: −54 + 30 μm, powder D: −74 + 54 μm and powder E: −106 + 74 μm). Phase composition and microstructure of coatings were characterized by x-ray diffraction (XRD) and scanning electron microscope. The bonding strength and microhardness of coatings were also evaluated. The XRD results show that there exists mutual transformation between T-MoSi$_{2}$ and H-MoSi$_{2}$ phase and part of Mo-rich phases are formed because of oxidization during the spraying process. With the increase of spraying powders size, the content of Mo-rich phases (Mo or Mo$_{5}$Si$_{3}$) and molybdenum oxide (MoO$_{3}$) in coatings decreases, and that of disilicide-rich phase (MoSi$_{2}$) in coatings increases. The oxidation degree of MoSi$_{2}$ particle gradually decreases during the spraying process with the increase of spraying powders size. The MoSi$_{2}$ is the main phase of the as-sprayed coatings when the spraying powders size is beyond 30 μm. With the increase of spraying powders size, the porosity of the as-sprayed coating increases, and the bonding strength of the coating gradually decreases. The hardness of coatings first increases and then decreases with the increase of spraying powders size.
Starting Page	934
Ending Page	939
Page Count	6
File Format	PDF
ISSN	10599630
Journal	Journal of Thermal Spray Technology
Volume Number	23
Issue Number	6
e-ISSN	15441016
Language	English
Publisher	Springer US
Publisher Date	2014-06-13
Publisher Place	Boston
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	air plasma spraying bonding strength microhardness molybdenum disilicide coating particle size 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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