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Microstructure and Mechanical Properties of Microwave Post-processed Ni Coating

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Abstract

Flame-sprayed coatings are widely used in the industries attributed to their low cost and simple processing. However, the presence of porosity and poor adhesion with the substrate requires suitable post-processing of the as-sprayed deposits. In the present work, post-processing of the flame-sprayed Ni-based coating has been successfully attempted using microwave hybrid heating. Microwave post-processing of the flame-sprayed coatings was carried out at 2.45 GHz in a 1 kW multimode industrial microwave applicator. The microwave-processed and as-sprayed deposits were characterized for their microstructure, porosity, fracture toughness and surface roughness. The properties of the coatings were correlated with their abrasive wear behavior using a sliding abrasion test on a pin-on-disk tribometer. Microwave post-processing led to healed micropores and microcracks, thus causing homogenization of the microstructure in the coating layer. Therefore, microwave post-processed coating layer exhibits improved mechanical and tribological properties compared to the as-sprayed coating layer.

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Authors and Affiliations

  1. School of Engineering, Indian Institute of Technology Mandi, Kamand, Mandi, 175005, India

    Sunny Zafar

  2. Mechanical and Industrial Engineering Department, Indian Institute of Technology Roorkee, Roorkee, 247667, India

    Apurbba Kumar Sharma

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  1. Sunny Zafar
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  2. Apurbba Kumar Sharma
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Correspondence to Apurbba Kumar Sharma.

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Zafar, S., Sharma, A.K. Microstructure and Mechanical Properties of Microwave Post-processed Ni Coating. J. of Materi Eng and Perform 26, 1382–1390 (2017). https://doi.org/10.1007/s11665-017-2540-y

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  • DOI: https://doi.org/10.1007/s11665-017-2540-y

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