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<p>To overcome the issue of cracking during the preparation of multiphase lubricating coatings, laser cladding was employed to produce nickel-based and mid-to-low-temperature sulfide lubricating phases combined with high-temperature h-BN lubricating phase composite coatings. The results indicate that crack-free coatings could be produced with laser power ranging from 800 to 2000&#xa0;W. Additionally, the intermediate granular phases in the coating prepared at 1400 W were more densely packed. The peak microhardness of the 1400 W coating was 1.19 and 1.10 times that of the 800 and 2000&#xa0;W coatings, respectively. At 200&#xa0;°C, the lowest coefficient of friction (COF) was 0.45 due to sulfide lubrication. At 500 and 700&#xa0;°C, the COF dropped to 0.26 owing to the synergistic effect of oxides and h-BN. The 800 W coating showed a wear rate at 200&#xa0;°C that was 0.64 and 0.92 times that of the 1400 and 2000 W coatings, respectively. At 500&#xa0;°C, the wear rate of the 1400 W coating was 0.77 and 0.75 times that of the 800 and 2000&#xa0;W coatings. At 700&#xa0;°C, the wear rate of the 1400 W coating was 0.91 and 0.97 times that of the 800 and 2000&#xa0;W coatings. The dominant wear mechanism at 200&#xa0;°C was abrasive wear, while at 500 and 700&#xa0;°C, the wear was primarily driven by the synergistic effects of h-BN and oxides.</p> Graphical Abstract <p></p>

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The Effect of Laser Power Variation on the Performance of In-Situ Synthesized Wide-Temperature-Range Sulfide and Boride Self-Lubricating Wear-Resistant Coatings

  • 期刊论文

  • 发表日期：

    2025年10月6日

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  • GuoChao Ma,
  • Ming Pang

摘要

To overcome the issue of cracking during the preparation of multiphase lubricating coatings, laser cladding was employed to produce nickel-based and mid-to-low-temperature sulfide lubricating phases combined with high-temperature h-BN lubricating phase composite coatings. The results indicate that crack-free coatings could be produced with laser power ranging from 800 to 2000 W. Additionally, the intermediate granular phases in the coating prepared at 1400 W were more densely packed. The peak microhardness of the 1400 W coating was 1.19 and 1.10 times that of the 800 and 2000 W coatings, respectively. At 200 °C, the lowest coefficient of friction (COF) was 0.45 due to sulfide lubrication. At 500 and 700 °C, the COF dropped to 0.26 owing to the synergistic effect of oxides and h-BN. The 800 W coating showed a wear rate at 200 °C that was 0.64 and 0.92 times that of the 1400 and 2000 W coatings, respectively. At 500 °C, the wear rate of the 1400 W coating was 0.77 and 0.75 times that of the 800 and 2000 W coatings. At 700 °C, the wear rate of the 1400 W coating was 0.91 and 0.97 times that of the 800 and 2000 W coatings. The dominant wear mechanism at 200 °C was abrasive wear, while at 500 and 700 °C, the wear was primarily driven by the synergistic effects of h-BN and oxides.

Graphical Abstract