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<p>The aim of this study is to develop a composite coating with high-temperature-resistant electrical insulation properties, designed for application on the surface of metallic copper substrates. This addresses the dual challenges of oxidation resistance and electrical insulation for copper components in high-temperature environments. In this research, an organic polysilazane resin was combined with silicon carbide (SiC) filler to create a protective composite coating on metallic copper surfaces. The parameters for the coating preparation process were systematically optimized. To further improve the interfacial compatibility between the filler and the resin, γ-glycidyl ether oxypropyltrimethoxysilane (KH-560) was employed for the surface modification of SiC. The chemical composition changes in the powder before and after modification were characterized using Fourier-transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), and X-ray photoelectron spectroscopy (XPS). The microstructural morphology of the coating was examined using scanning electron microscopy (SEM), and various properties of the coating were thoroughly investigated. The results demonstrate that the modification of the powder significantly enhanced the coating's resistance to high temperatures, thereby maintaining its structural integrity after exposure to 500&#xa0;°C for 2&#xa0;h and 750&#xa0;°C for 30&#xa0;min. The coating exhibited a range of superior properties, including exceptional hydrophobicity, high hardness, and substantial electrical insulation. SEM analysis revealed that the dispersion of the modified powder within the coating was improved, reducing the occurrence of agglomeration and enhancing the compatibility between the resin and the powder. This improvement mitigated issues related to coating cracking and adhesion degradation, thereby enhancing the coating's high-temperature resistance. The polysilazane/SiC composite coating, developed through a silane coupling agent interface modification strategy, successfully achieved a synergistic enhancement of temperature resistance and electromechanical protection properties by optimizing filler dispersion and interfacial bonding.</p>

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Preparation and Performance of High-temperature-resistant Electrical Insulating Coatings on Copper Surfaces with Polysilazanes

  • 期刊论文

  • 发表日期：

    2025年12月1日

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  • Zhaoqun Pan,
  • Zhiliang Shen,
  • Ming Zhong

摘要

The aim of this study is to develop a composite coating with high-temperature-resistant electrical insulation properties, designed for application on the surface of metallic copper substrates. This addresses the dual challenges of oxidation resistance and electrical insulation for copper components in high-temperature environments. In this research, an organic polysilazane resin was combined with silicon carbide (SiC) filler to create a protective composite coating on metallic copper surfaces. The parameters for the coating preparation process were systematically optimized. To further improve the interfacial compatibility between the filler and the resin, γ-glycidyl ether oxypropyltrimethoxysilane (KH-560) was employed for the surface modification of SiC. The chemical composition changes in the powder before and after modification were characterized using Fourier-transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), and X-ray photoelectron spectroscopy (XPS). The microstructural morphology of the coating was examined using scanning electron microscopy (SEM), and various properties of the coating were thoroughly investigated. The results demonstrate that the modification of the powder significantly enhanced the coating's resistance to high temperatures, thereby maintaining its structural integrity after exposure to 500 °C for 2 h and 750 °C for 30 min. The coating exhibited a range of superior properties, including exceptional hydrophobicity, high hardness, and substantial electrical insulation. SEM analysis revealed that the dispersion of the modified powder within the coating was improved, reducing the occurrence of agglomeration and enhancing the compatibility between the resin and the powder. This improvement mitigated issues related to coating cracking and adhesion degradation, thereby enhancing the coating's high-temperature resistance. The polysilazane/SiC composite coating, developed through a silane coupling agent interface modification strategy, successfully achieved a synergistic enhancement of temperature resistance and electromechanical protection properties by optimizing filler dispersion and interfacial bonding.