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Coatings 2017, 7(12), 238; doi:10.3390/coatings7120238

Microstructure and Tribological Performance of TiB2-NiCr Composite Coating Deposited by APS

1
Department of Material Science and Engineering, Shenyang University of Technology, Shenyang 110870, China
2
Dalian Huarui Heavy Industrial Special Spare Parts Co., Ltd., Dalian 116052, China
*
Author to whom correspondence should be addressed.
Academic Editor: Robert B. Heimann
Received: 19 October 2017 / Revised: 16 December 2017 / Accepted: 18 December 2017 / Published: 20 December 2017
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Abstract

Nickel chromium (NiCr) powders with different titanium diboride (TiB2) additions (20, 40 and 60 wt %) were prepared with a mechanical alloying method and then sprayed using an air plasma spraying technology. The microstructure and phase composite of the powders and the cross-sections of deposited coatings were analyzed with a scanning electronic microscope and X-ray diffraction. The tribological performance of the coatings was studied using a pin-on-disk tribometer at room temperature. The weight loss of the as-sprayed coating was measured by using a high accuracy weighing balance. Cr3C2-25NiCr coating was produced and tested for comparison. The morphologies of the worn surface were then investigated. Parts of debris with some scratches were found, presenting typical signs of abrasive wear and showing slight adhesive wear on the surface. The 20 wt % additive TiB2 coating demonstrated the highest microhardness and the lowest coefficient of friction. The wear resistance of the metal-ceramic composites coatings was enhanced with the addition of TiB2. View Full-Text
Keywords: TiB2-NiCr; air plasma spray; mechanical alloying; tribological property TiB2-NiCr; air plasma spray; mechanical alloying; tribological property
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Zhang, N.; Zhang, N.; Wei, X.; Zhang, Y.; Li, D. Microstructure and Tribological Performance of TiB2-NiCr Composite Coating Deposited by APS. Coatings 2017, 7, 238.

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