Surface and Subsurface Characteristics of NiCrBSi Coating with Different WC Amount Prepared by Flame Spray Method
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Author list: Usana-ampaipong T., Dumkum C., Tuchinda K., Tangwarodomnukun V., Teeraprawatekul B., Qi H.
Publisher: Springer New York LLC
Publication year: 2019
Volume number: 28
Issue number: 3
Start page: 580
End page: 590
Number of pages: 11
ISSN: 1059-9630
eISSN: 1059-9630
Languages: English-Great Britain (EN-GB)
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Abstract
This research aims at understanding the spray coating of NiCrBSi with different amount of tungsten carbide particles on JIS SUP9 steel substrate. The amount of tungsten carbide added to NiCrBSi was 0, 20, and 40% by volume to reinforce the coating. Microstructures, microhardness, adhesion, cohesion, and rigidity of coating were characterized. The results revealed that NiCrBSi structure composed of nickel solid solution as matrix embedded with Ni boride and Ni 4 Si with chromium carbide distributed across the coating. Tungsten carbide particles were apparent in the coating and they partially diffused into the NiCrBSi coating. In the case of 40% tungsten carbide addition, the matrix hardness was increased by 29.18%, but the cohesion of coating was reduced by 22.94%. The adhesion failure was not apparent in all samples examined in this study under the 20 N scratch load. Wear area of coatings mixed with tungsten carbide addition was found to decrease by 3.5 to 8.8 times compared to the substrate. As per the findings, the addition of WC can promote the wear resistance by its reinforcement and also introduce the solid solution strengthening of W in the NiCrBSi matrix, specifically in the Ni solid solution. ฉ 2019, ASM International.
Keywords
NiCrBSi coating
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