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Surface Characterization and Mechanical Properties’ Evaluation of Boride-Dispersed Nickel-Based Coatings Deposited on Copper Through Thermal Spray Routes

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Abstract

The present study concerns understanding the microstructures and wear resistance of nickel-based alloy (Ni 68.4, Cr 17, B 3.9, Si 4.9, and Fe 5.8) coatings on copper developed by flame spraying and high-velocity oxy-fuel (HVOF) coating techniques. The microstructure of flame spray deposition consists of predominantly equiaxed γ-Ni grains, refined Ni3B precipitates, and Ni2.9Cr0.7Fe0.36 phase. On the other hand, HVOF spray deposition reduces the porosity content significantly in the presence of very fine (with average precipitate size varying from μm to nm range) borides (chromium boride, Cr2B; and nickel boride, Ni3B) in γ-Ni matrix. The microhardness of the HVOF-sprayed and flame-sprayed surfaces were improved to 935 VHN and 251 VHN, respectively as compared with 82 VHN of the as-received substrate. Wear resistance property against WC indenter was also improved in deposited layers with a maximum improvement in HVOF spray deposition. The mechanism of wear was investigated.

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Acknowledgments

Partial financial support from Council of Scientific and Industrial Research, New Delhi, Dept. of Sci. & Tech., New Delhi and Naval Research Board, New Delhi for the present study is gratefully acknowledged.

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Authors and Affiliations

  1. Department of Metallurgical and Materials Engineering, IIT, Kharagpur, 721302, West Bengal, India

    Prashant Sharma & Jyotsna Dutta Majumdar

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  1. Prashant Sharma
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  2. Jyotsna Dutta Majumdar
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Correspondence to Jyotsna Dutta Majumdar.

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Sharma, P., Majumdar, J.D. Surface Characterization and Mechanical Properties’ Evaluation of Boride-Dispersed Nickel-Based Coatings Deposited on Copper Through Thermal Spray Routes. J Therm Spray Tech 21, 800–809 (2012). https://doi.org/10.1007/s11666-012-9776-8

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  • DOI: https://doi.org/10.1007/s11666-012-9776-8

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