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<p>SiC-ZrB<sub>2</sub>/SiC-TiCN laminated ceramics were designed and prepared. The effect of sintering temperature (ST) on residual stress (RS), microstructure, and mechanical properties was investigated. The alternating distribution of residual compressive stress (RCS) and residual tensile stress was in accordance with the alternation of SiC-ZrB<sub>2</sub> layer and SiC-TiCN layer. As the ST increased, relative density, interlaminar fracture toughness, and impact toughness (IT) increased; flexural strength (FS), Vickers hardness, and overall fracture toughness (OFT) first increased and then decreased. The laminated ceramic showed better comprehensive mechanical properties when the ST was 1800&#xa0;°C: the FS, OFT, and IT were 936.41 ± 10.52, 8.43 ± 0.13&#xa0;MPa·m<sup>1/2</sup>, and 4.47 ± 0.11&#xa0;J/cm<sup>2</sup>, respectively. The RS induced crack deflection (CD), and the RCS enhanced the resistance strength of the ceramic and inhibited crack propagation. The impact-resistant mechanism was that the RCS inhibited crack initiation. The toughening mechanism primarily included transgranular fracture, intragranular fracture, CD, and crack bridging. This study can provide new strategies and perspectives to enhance the fracture toughness and IT of ceramics.</p>

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Effect of Sintering Temperature on Residual Stress, Microstructure and Mechanical Properties of SiC-ZrB2/SiC-TiCN Laminated Ceramics

  • 期刊论文

  • 发表日期：

    2026年5月6日

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  • Xinyan Li,
  • Kaishuo Guo,
  • Jiaojiao Gao,
  • Jinpeng Song

摘要

SiC-ZrB2/SiC-TiCN laminated ceramics were designed and prepared. The effect of sintering temperature (ST) on residual stress (RS), microstructure, and mechanical properties was investigated. The alternating distribution of residual compressive stress (RCS) and residual tensile stress was in accordance with the alternation of SiC-ZrB2 layer and SiC-TiCN layer. As the ST increased, relative density, interlaminar fracture toughness, and impact toughness (IT) increased; flexural strength (FS), Vickers hardness, and overall fracture toughness (OFT) first increased and then decreased. The laminated ceramic showed better comprehensive mechanical properties when the ST was 1800 °C: the FS, OFT, and IT were 936.41 ± 10.52, 8.43 ± 0.13 MPa·m1/2, and 4.47 ± 0.11 J/cm2, respectively. The RS induced crack deflection (CD), and the RCS enhanced the resistance strength of the ceramic and inhibited crack propagation. The impact-resistant mechanism was that the RCS inhibited crack initiation. The toughening mechanism primarily included transgranular fracture, intragranular fracture, CD, and crack bridging. This study can provide new strategies and perspectives to enhance the fracture toughness and IT of ceramics.