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<p>Microcrystalline diamond-coated tools, while advantageous for cutting carbon fiber-reinforced plastic (CFRP) due to their high hardness, are prone to premature delamination during machining caused by their inherent hardness–toughness trade-off. This study systematically investigates nitrogen-doped diamond coatings deposited via hot filament chemical vapor deposition (HFCVD) onto cemented carbide substrates, varying nitrogen content proportion (0-10% in H<sub>2</sub>/CH<sub>4</sub>) to optimize interfacial bonding and wear performance. Comprehensive characterization reveals that nitrogen doping induces a microstructural transition from micro- to nanocrystalline diamond with enhanced growth grate, achieving a (110) texture across all variants. At 3 vol.% nitrogen, coatings exhibit minimal residual stress&#xa0;and the best adhesion with cemented carbide substrates. Moreover, the lower surface roughness and undulation of nitrogen doping diamond coating contribute to a lower friction coefficient versus microcrystalline coating during diamond coatings wear with CFRP. The nitrogen-doped diamond coating slows down the formation of non-diamond phases during the friction process between the diamond coating and the alumina balls. This study provides foundational data and guiding principles for the development of high-performance diamond-coated tools for CFRP machining.</p>

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Microstructure and Tribological Properties of Nitrogen-Doped Diamond Coating on Cemented Carbide Rods

  • 期刊论文

  • 发表日期：

    2026年1月7日

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  • Yinchao Xu,
  • Binyuan Tang,
  • Guanghua Wen,
  • Yuanyuan Li

摘要

Microcrystalline diamond-coated tools, while advantageous for cutting carbon fiber-reinforced plastic (CFRP) due to their high hardness, are prone to premature delamination during machining caused by their inherent hardness–toughness trade-off. This study systematically investigates nitrogen-doped diamond coatings deposited via hot filament chemical vapor deposition (HFCVD) onto cemented carbide substrates, varying nitrogen content proportion (0-10% in H2/CH4) to optimize interfacial bonding and wear performance. Comprehensive characterization reveals that nitrogen doping induces a microstructural transition from micro- to nanocrystalline diamond with enhanced growth grate, achieving a (110) texture across all variants. At 3 vol.% nitrogen, coatings exhibit minimal residual stress and the best adhesion with cemented carbide substrates. Moreover, the lower surface roughness and undulation of nitrogen doping diamond coating contribute to a lower friction coefficient versus microcrystalline coating during diamond coatings wear with CFRP. The nitrogen-doped diamond coating slows down the formation of non-diamond phases during the friction process between the diamond coating and the alumina balls. This study provides foundational data and guiding principles for the development of high-performance diamond-coated tools for CFRP machining.