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<p>Casting rolls, the core components of strip casting, often suffer from defects such as low hardness, poor wear resistance, and high thermal shock sensitivity. Traditional hard chromium coating on the roll surface is challenging to meet the requirements of industrial production for the “wetting–heat transfer–wear resistance” synergy. In this study, by innovatively gradient adjusting the Ni–Cr ratios (1:0, 2:1, 1:2, 0:1) without heat treatment, the comprehensive properties of the Ni/Cr composite coating were optimized. The results showed that due to the higher thermal conductivity of nickel, the heat transfer performance of the coating increased as the thickness of the nickel layer increased. But the thick Ni coating had a better heat transfer performance than the pure Ni coating, since chromium exhibits much better surface wettability than nickel due to its lattice constant being closer to that of iron. Besides, although the depths of the wear scars for Ni/Cr composite coatings were slightly greater than those of the pure Cr coating, it had a more significant advantage in terms of wear mass losses, which demonstrated that the material underwent large-scale plastic flow rather than fracture and peeling due to the crucial role of nickel as an intermediate layer. This provides a theoretical basis and technical support for the design of surface coating on industrial strip casting rolls.</p>

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Integrated Ni/Cr Gradient Coating for Simultaneous Enhancement of Heat Transfer and Wear Resistance in Strip Casting Rolls

  • 期刊论文

  • 发表日期：

    2026年6月3日

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  • Shaogang Li,
  • Lulu Song,
  • Chenyang Zhu,
  • Wanlin Wang,
  • Hairong Guo,
  • Hualong Li

摘要

Casting rolls, the core components of strip casting, often suffer from defects such as low hardness, poor wear resistance, and high thermal shock sensitivity. Traditional hard chromium coating on the roll surface is challenging to meet the requirements of industrial production for the “wetting–heat transfer–wear resistance” synergy. In this study, by innovatively gradient adjusting the Ni–Cr ratios (1:0, 2:1, 1:2, 0:1) without heat treatment, the comprehensive properties of the Ni/Cr composite coating were optimized. The results showed that due to the higher thermal conductivity of nickel, the heat transfer performance of the coating increased as the thickness of the nickel layer increased. But the thick Ni coating had a better heat transfer performance than the pure Ni coating, since chromium exhibits much better surface wettability than nickel due to its lattice constant being closer to that of iron. Besides, although the depths of the wear scars for Ni/Cr composite coatings were slightly greater than those of the pure Cr coating, it had a more significant advantage in terms of wear mass losses, which demonstrated that the material underwent large-scale plastic flow rather than fracture and peeling due to the crucial role of nickel as an intermediate layer. This provides a theoretical basis and technical support for the design of surface coating on industrial strip casting rolls.