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<p>This study focuses on TiN coatings prepared by magnetron sputtering, with surface modification achieved via laser remelting at varying scanning speeds (15, 30&#xa0;mm/s). The influence mechanism of laser scanning speed on the microstructure and interface bonding performance of TiN coatings was systematically explored by various characterization methods, such as a zoom 3D microscope, SEM, EDS, XRD, and a micrometer scratch tester. The research results indicate that after laser remelting at a scanning speed of 30&#xa0;mm/s, the surface roughness (Ra value) of TiN coating significantly decreased from 7.9 to 1.63&#xa0;μm. Additionally, the surface cracks and interface pores are reduced considerably, and the density of the coating is improved. XRD analysis shows that the laser remelting treatment does not change the phase composition of the TiN coating; however, it resulted in a shift in the diffraction peaks, an increase in peak width, and grain refinement. EDS results show that laser treatment significantly enhances the element diffusion effect at the coating and substrate interface. In addition, the micron scratch test further confirmed that after laser remelting at a scanning speed of 30&#xa0;mm/s, the critical load required to scratch the coating increased significantly. In contrast, the scratch depth was reduced by about 50%, indicating a marked enhancement in the interface bonding performance between the coating and the substrate. Overall, this study reveals the mechanism of the influence of laser scanning speed on the microstructure and properties of TiN coatings. The results obtained can provide a theoretical basis and technical reference for the optimization of the laser remelting process of TiN coatings.</p>

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Effect of Laser Remelting on Microstructure and Properties of Magnetron Sputtered TiN Coatings

  • 期刊论文

  • 发表日期：

    2025年9月12日

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  • Xin Ma,
  • Qiang Shi,
  • Yong Huang,
  • Yanzhong Chen,
  • Qiang Li,
  • Ping Xiao

摘要

This study focuses on TiN coatings prepared by magnetron sputtering, with surface modification achieved via laser remelting at varying scanning speeds (15, 30 mm/s). The influence mechanism of laser scanning speed on the microstructure and interface bonding performance of TiN coatings was systematically explored by various characterization methods, such as a zoom 3D microscope, SEM, EDS, XRD, and a micrometer scratch tester. The research results indicate that after laser remelting at a scanning speed of 30 mm/s, the surface roughness (Ra value) of TiN coating significantly decreased from 7.9 to 1.63 μm. Additionally, the surface cracks and interface pores are reduced considerably, and the density of the coating is improved. XRD analysis shows that the laser remelting treatment does not change the phase composition of the TiN coating; however, it resulted in a shift in the diffraction peaks, an increase in peak width, and grain refinement. EDS results show that laser treatment significantly enhances the element diffusion effect at the coating and substrate interface. In addition, the micron scratch test further confirmed that after laser remelting at a scanning speed of 30 mm/s, the critical load required to scratch the coating increased significantly. In contrast, the scratch depth was reduced by about 50%, indicating a marked enhancement in the interface bonding performance between the coating and the substrate. Overall, this study reveals the mechanism of the influence of laser scanning speed on the microstructure and properties of TiN coatings. The results obtained can provide a theoretical basis and technical reference for the optimization of the laser remelting process of TiN coatings.