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Abstract <p>Copper water-cooled blast furnace tuyeres are among the most critical components for ensuring uninterrupted furnace operation. They are subjected to an abrasive charge action, slag adhesion, and high-temperature gas corrosion. Multilayer thermal barrier coatings (TBCs) can be effectively applied to enhance the resistance of tuyeres. The laser melting of an outer coating layer, namely, an Ni–B–Si alloy, deposited directly onto the copper tuyere surface is found to be critical to the reliability and durability of the coating. This treatment promotes mixing between the coating material and the base, which facilitates a copper–nickel interaction to form a heat-resistant structure similar to Monel metal. This structure ensures a gradual transition of physicochemical properties from layer to layer in the coating. The coating is examined using electron probe microanalysis (EPMA) and X-ray diffraction (XRD) analysis. EPMA data show significant inhomogeneity in the unmodified coating. After laser treatment, a transition layer approximately 100 μm thick forms between the base and the coating. Complete intermixing of the components is observed at the surface and within the molten copper region. Silicon is present in both oxide and unbound forms. XRD analysis confirms negligible diffusion of sublayer elements into the base and detects the CuNi phase in the molten zone, which is consistent with EPMA results.</p>

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Effect of Laser Melting of Ni–B–Si Coatings on the Phase and Element Distribution in the Base Material

  • 期刊论文

  • 发表日期：

    2025年2月1日

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  • I. S. Bakhteev,
  • K. I. Oleinik,
  • E. L. Furman,
  • R. M. Valiev,
  • A. A. Vopneruk

摘要

Abstract

Copper water-cooled blast furnace tuyeres are among the most critical components for ensuring uninterrupted furnace operation. They are subjected to an abrasive charge action, slag adhesion, and high-temperature gas corrosion. Multilayer thermal barrier coatings (TBCs) can be effectively applied to enhance the resistance of tuyeres. The laser melting of an outer coating layer, namely, an Ni–B–Si alloy, deposited directly onto the copper tuyere surface is found to be critical to the reliability and durability of the coating. This treatment promotes mixing between the coating material and the base, which facilitates a copper–nickel interaction to form a heat-resistant structure similar to Monel metal. This structure ensures a gradual transition of physicochemical properties from layer to layer in the coating. The coating is examined using electron probe microanalysis (EPMA) and X-ray diffraction (XRD) analysis. EPMA data show significant inhomogeneity in the unmodified coating. After laser treatment, a transition layer approximately 100 μm thick forms between the base and the coating. Complete intermixing of the components is observed at the surface and within the molten copper region. Silicon is present in both oxide and unbound forms. XRD analysis confirms negligible diffusion of sublayer elements into the base and detects the CuNi phase in the molten zone, which is consistent with EPMA results.