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<p>The top foil of air bearings is typically made of nickel-based alloy IN718. However, due to its low hardness and poor wear resistance, the top foil is prone to wear during the start–stop phases of the bearing. To improve the wear resistance of IN718 alloy, an IN718/Cu composite coating was prepared on its surface, and micro-texturing was performed on the coating surface by a Nd:YAG pulsed laser. The results show that the microstructure of the coating primarily consists of <i>γ</i>-Ni, (Fe, Ni) solid solution, Cu phase, and intermetallic compounds. The surface hardness of the coating is 180&#xa0;HV<sub>0.5</sub>, which is 9% higher than the substrate hardness (165&#xa0;HV<sub>0.5</sub>). The surface hardness of the textured coatings was found to increase to 281&#xa0;HV<sub>0.5</sub> (1 pulse), 239&#xa0;HV<sub>0.5</sub> (40 pulses), and 265&#xa0;HV<sub>0.5</sub> (100 pulses), representing improvements of 70, 44.8, and 60.6%, respectively, compared to the substrate. The wear rate and friction coefficient of the coating under a 50&#xa0;N load were lower than those under a 10&#xa0;N load. The coating textured with 1 pulse exhibited the best wear resistance. Compared to the original coating, the textured coatings reduced the average friction coefficient and wear rate, with reductions of 27.3 and 20.5% for 1 pulse, 12.4 and 10.4% for 40 pulses, and 30.4 and 5% for 100 pulses. The main wear mechanisms for 1 and 40 pulses were oxidative wear and abrasive wear, and for 100 pulses, it was primarily oxidative wear.</p> Graphical Abstract <p></p>

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Study on the Effect of Surface Micro-texturing on the Tribological Performance of Laser-Cladded IN718/Cu Composite Coating

  • 期刊论文

  • 发表日期：

    2026年8月5日

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  • San-Xiong Ji,
  • Ming Pang

摘要

The top foil of air bearings is typically made of nickel-based alloy IN718. However, due to its low hardness and poor wear resistance, the top foil is prone to wear during the start–stop phases of the bearing. To improve the wear resistance of IN718 alloy, an IN718/Cu composite coating was prepared on its surface, and micro-texturing was performed on the coating surface by a Nd:YAG pulsed laser. The results show that the microstructure of the coating primarily consists of γ-Ni, (Fe, Ni) solid solution, Cu phase, and intermetallic compounds. The surface hardness of the coating is 180 HV0.5, which is 9% higher than the substrate hardness (165 HV0.5). The surface hardness of the textured coatings was found to increase to 281 HV0.5 (1 pulse), 239 HV0.5 (40 pulses), and 265 HV0.5 (100 pulses), representing improvements of 70, 44.8, and 60.6%, respectively, compared to the substrate. The wear rate and friction coefficient of the coating under a 50 N load were lower than those under a 10 N load. The coating textured with 1 pulse exhibited the best wear resistance. Compared to the original coating, the textured coatings reduced the average friction coefficient and wear rate, with reductions of 27.3 and 20.5% for 1 pulse, 12.4 and 10.4% for 40 pulses, and 30.4 and 5% for 100 pulses. The main wear mechanisms for 1 and 40 pulses were oxidative wear and abrasive wear, and for 100 pulses, it was primarily oxidative wear.

Graphical Abstract