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<p>SiC-ZrB<sub>2</sub>/SiC-TiCN (SZ/ST) laminated ceramics were fabricated, and the effects of layer thickness ratio (LTR) on their residual stress (RS), microstructure, and mechanical properties were investigated. The results showed that the residual compressive stress (RCS) in the SZ and the residual tensile stress (RTS) in the ST showed an alternating distribution; as the LTR increased, the RCS increased, while the RTS decreased. With an increase in the LTR, the relative density, Vickers hardness, interlaminar fracture toughness, overall fracture toughness (OFT), flexural strength (FS), and impact toughness (IT) initially increased and then declined. The ceramic exhibited better mechanical properties when the LTR was 3: the OFT, FS, and IT were 8.24 ± 0.16&#xa0;MPa&#xa0;m<sup>1/2</sup>, 907.31 ± 11.4&#xa0;MPa, and 4.54 ± 0.09&#xa0;J/cm<sup>2</sup>, respectively. The toughening mechanism of the ceramic consisted of transgranular fracture, intragranular fracture, crack deflection, and crack branching. The primary impact-resistant mechanism was that the RCS in the SZ could inhibit crack initiation. This study analyzed the relationship between the RS, microstructure evolution, and mechanical properties, offering a novel perspective for enhancing the fracture toughness and IT of the SiC-based ceramics.</p>

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Effects of Layer Thickness Ratio on Residual Stress, Microstructure and Mechanical Properties of SiC-ZrB2/SiC-TiCN Laminated Ceramics

  • 期刊论文

  • 发表日期：

    2026年1月6日

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  • Jinpeng Song,
  • Kaishuo Guo,
  • Jiaojiao Gao

摘要

SiC-ZrB2/SiC-TiCN (SZ/ST) laminated ceramics were fabricated, and the effects of layer thickness ratio (LTR) on their residual stress (RS), microstructure, and mechanical properties were investigated. The results showed that the residual compressive stress (RCS) in the SZ and the residual tensile stress (RTS) in the ST showed an alternating distribution; as the LTR increased, the RCS increased, while the RTS decreased. With an increase in the LTR, the relative density, Vickers hardness, interlaminar fracture toughness, overall fracture toughness (OFT), flexural strength (FS), and impact toughness (IT) initially increased and then declined. The ceramic exhibited better mechanical properties when the LTR was 3: the OFT, FS, and IT were 8.24 ± 0.16 MPa m1/2, 907.31 ± 11.4 MPa, and 4.54 ± 0.09 J/cm2, respectively. The toughening mechanism of the ceramic consisted of transgranular fracture, intragranular fracture, crack deflection, and crack branching. The primary impact-resistant mechanism was that the RCS in the SZ could inhibit crack initiation. This study analyzed the relationship between the RS, microstructure evolution, and mechanical properties, offering a novel perspective for enhancing the fracture toughness and IT of the SiC-based ceramics.