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<p>The study investigates the effect of nano-yttria-doped ceria (YDC) reinforcements on the tribological performance of thermally sprayed Cr<sub>3</sub>C<sub>2</sub>-NiCr coatings. 1 wt.% of nano-YDC was mixed with Cr<sub>3</sub>C<sub>2</sub>-NiCr powder with a unique mixing process and then deposited with high velocity oxy fuel (HVOF) spray on stainless steel substrates. The coating powders and as-sprayed coatings were characterized for their microstructure, phase composition, surface roughness, porosity, and microhardness. Sliding wear tests were performed using&#xa0;a ball-on-disk tribometer to determine the coefficient of friction (CoF) and wear rate. The coatings reinforced with YDC showed a reduction of 12.5% and 29.5% in the values of CoF and specific wear rate, respectively, compared to those of the unreinforced coating. The worn surface was analyzed utilizing FE-SEM and a 3D optical profilometer. The improvement in mechanical properties and wear resistance of the composite coatings was attributed to the microstructure refinement caused by the inclusion of YDC.</p>

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Investigating the Tribological Performance of Cr3C2-NiCr Coatings Reinforced with Nano-Yttria-Doped Ceria

  • 期刊论文

  • 发表日期：

    2025年6月9日

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  • Hetal R. Chauhan,
  • Ajaykumar Solanki,
  • Sahil Variya,
  • Sekar Saladi

摘要

The study investigates the effect of nano-yttria-doped ceria (YDC) reinforcements on the tribological performance of thermally sprayed Cr3C2-NiCr coatings. 1 wt.% of nano-YDC was mixed with Cr3C2-NiCr powder with a unique mixing process and then deposited with high velocity oxy fuel (HVOF) spray on stainless steel substrates. The coating powders and as-sprayed coatings were characterized for their microstructure, phase composition, surface roughness, porosity, and microhardness. Sliding wear tests were performed using a ball-on-disk tribometer to determine the coefficient of friction (CoF) and wear rate. The coatings reinforced with YDC showed a reduction of 12.5% and 29.5% in the values of CoF and specific wear rate, respectively, compared to those of the unreinforced coating. The worn surface was analyzed utilizing FE-SEM and a 3D optical profilometer. The improvement in mechanical properties and wear resistance of the composite coatings was attributed to the microstructure refinement caused by the inclusion of YDC.