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<p>TiN-TiCN/TiN-WC (TT/TW) laminated ceramics with different layer numbers (LN) were fabricated, and effects of LN on their residual stress, microstructure and mechanical properties were investigated. The results showed that the compressive and tensile stress layers were distributed alternately, and the more layers there were, the greater the residual compressive stress and the lower the residual tensile stress. The TT primarily consisted of TiN, TiCN and Ni/Co binder phases, while the TW was predominantly comprised of TiN, (Ti, W, Cr)(C, N) solid solution, trace amounts of Co<sub>3</sub>W<sub>3</sub>C and TiN<sub>1−<i>x</i></sub>. Fracture mode of the ceramic was a mixed fracture mode of transgranular and intergranular fracture. With an increase of LN, the relative density, Vickers hardness (VH) and flexural strength (FS) of the ceramics first rose and then declined, while fracture toughness (FT) of both TT and TW increased. When the LN was 7, the ceramic exhibited a uniform microstructure, high density and better comprehensive mechanical properties—FS of 915.1 ± 15&#xa0;MPa, VH of 17.8 ± 0.2&#xa0;GPa for TT and 16.2 ± 0.2&#xa0;GPa for TW, FT of 10.9 ± 0.1&#xa0;MPa&#xa0;m<sup>1/2</sup> for TT and 9.4 ± 0.1&#xa0;MPa&#xa0;m<sup>1/2</sup> for TW.</p>

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Effects of Layer Numbers on Residual Stress, Microstructure and Mechanical Properties of TiN-TiCN/TiN-WC Laminated Ceramics

  • 期刊论文

  • 发表日期：

    2025年2月7日

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  • Shikang Liu,
  • Jiaojiao Gao,
  • Jinpeng Song,
  • Yao Wang

摘要

TiN-TiCN/TiN-WC (TT/TW) laminated ceramics with different layer numbers (LN) were fabricated, and effects of LN on their residual stress, microstructure and mechanical properties were investigated. The results showed that the compressive and tensile stress layers were distributed alternately, and the more layers there were, the greater the residual compressive stress and the lower the residual tensile stress. The TT primarily consisted of TiN, TiCN and Ni/Co binder phases, while the TW was predominantly comprised of TiN, (Ti, W, Cr)(C, N) solid solution, trace amounts of Co3W3C and TiN1−x. Fracture mode of the ceramic was a mixed fracture mode of transgranular and intergranular fracture. With an increase of LN, the relative density, Vickers hardness (VH) and flexural strength (FS) of the ceramics first rose and then declined, while fracture toughness (FT) of both TT and TW increased. When the LN was 7, the ceramic exhibited a uniform microstructure, high density and better comprehensive mechanical properties—FS of 915.1 ± 15 MPa, VH of 17.8 ± 0.2 GPa for TT and 16.2 ± 0.2 GPa for TW, FT of 10.9 ± 0.1 MPa m1/2 for TT and 9.4 ± 0.1 MPa m1/2 for TW.