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<p>This study utilized finite element simulation to analyze the regulation rules of residual stress by the layer count and layer thickness ratio in the laminated structure of ceramic cutting tools. Based on the numerical analysis results, Si<sub>3</sub>N<sub>4</sub>-GNPs-SiC<sub>w</sub>/Si<sub>3</sub>N<sub>4</sub>-TiC laminated ceramic cutting tools with different layer counts and layer thickness ratios were fabricated using spark plasma sintering technology. Experimental data indicate that the laminated ceramic cutting tools exhibit optimal fracture toughness, flexural strength, and Vickers hardness when the layer count is 7 and the layer thickness ratio is 6. The corresponding values are 9.92&#xa0;MPa·m1/2, 681.5&#xa0;MPa, and 15.1 GPa, respectively. Cutting experiments on 45# steel further demonstrate the advantages of laminated structures. Compared to homogeneous Si<sub>3</sub>N<sub>4</sub>-TiC ceramic cutting tools, the laminated ceramic cutting tools effectively reduce the cutting temperature by 35.9%. They also increase tool life by 66.7% and maintain the machined workpiece surface roughness stably around 2.5&#xa0;µm.</p>

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Fabrication and Evaluation of Si3N4-GNPs-SiCw/Si3N4-TiC Laminated Ceramic Cutting Tools

  • 期刊论文

  • 发表日期：

    2025年11月10日

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  • Zheng Gao,
  • Youkai Cui,
  • Guangchun Xiao,
  • Jingjie Zhang,
  • Hui Chen,
  • Mingdong Yi,
  • Zhaoqiang Chen,
  • Chonghai Xu

摘要

This study utilized finite element simulation to analyze the regulation rules of residual stress by the layer count and layer thickness ratio in the laminated structure of ceramic cutting tools. Based on the numerical analysis results, Si3N4-GNPs-SiCw/Si3N4-TiC laminated ceramic cutting tools with different layer counts and layer thickness ratios were fabricated using spark plasma sintering technology. Experimental data indicate that the laminated ceramic cutting tools exhibit optimal fracture toughness, flexural strength, and Vickers hardness when the layer count is 7 and the layer thickness ratio is 6. The corresponding values are 9.92 MPa·m1/2, 681.5 MPa, and 15.1 GPa, respectively. Cutting experiments on 45# steel further demonstrate the advantages of laminated structures. Compared to homogeneous Si3N4-TiC ceramic cutting tools, the laminated ceramic cutting tools effectively reduce the cutting temperature by 35.9%. They also increase tool life by 66.7% and maintain the machined workpiece surface roughness stably around 2.5 µm.