Scholarlink

<p>B<sub>4</sub>C-TiB<sub>2</sub> composite ceramics with superior performance were successfully prepared through an innovative high-pressure high-temperature (HPHT, 5&#xa0;GPa/1500&#xa0;°C) in-situ reactive sintering process, TiB<sub>2</sub> phases were synthesized through in-situ reaction between metal Ti and B<sub>4</sub>C. The results demonstrate that when Ti is added at 15 wt% exhibits optimal comprehensive properties: a flexural strength of 729 ± 19&#xa0;MPa, microhardness of 34.8 ± 0.5&#xa0;GPa, fracture toughness of 8.11 ± 0.11&#xa0;MPa&#xa0;m<sup>1/2</sup>, and electrical conductivity of (8.5 ± 0.06) × 10<sup>4&#xa0;</sup>S/m. Microstructural characterization reveals that the in-situ formed nano-TiB<sub>2</sub> inhibits abnormal grain growth of B<sub>4</sub>C through grain boundary pinning effect, resulting in a dense and homogeneous multi-phase structure. Simultaneously, the TiB<sub>2</sub> phase significantly enhances fracture toughness via multi-scale toughening mechanisms including crack deflection and bridging. Notably, the three-dimensional interconnected conductive network constructed by TiB<sub>2</sub> in the matrix, synergistically coupled with grain refinement effect, enhances the electrical conductivity of B<sub>4</sub>C-based composites. This research establishes a novel strategy for developing advanced ceramic composites with integrated high strength, high toughness, and functional characteristics through process-structure-property optimization, demonstrating significant application potential.</p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

High Pressure and Low Temperature In-Situ Preparation of B4C-TiB2 Composite Ceramics with Strengthening-Toughening Mechanisms

  • 期刊论文

  • 发表日期：

    2025年10月14日

查看全文
  • Jieqi Zhang,
  • Fuguan Peng,
  • Hong Shi,
  • Peicheng Mo

摘要

B4C-TiB2 composite ceramics with superior performance were successfully prepared through an innovative high-pressure high-temperature (HPHT, 5 GPa/1500 °C) in-situ reactive sintering process, TiB2 phases were synthesized through in-situ reaction between metal Ti and B4C. The results demonstrate that when Ti is added at 15 wt% exhibits optimal comprehensive properties: a flexural strength of 729 ± 19 MPa, microhardness of 34.8 ± 0.5 GPa, fracture toughness of 8.11 ± 0.11 MPa m1/2, and electrical conductivity of (8.5 ± 0.06) × 104 S/m. Microstructural characterization reveals that the in-situ formed nano-TiB2 inhibits abnormal grain growth of B4C through grain boundary pinning effect, resulting in a dense and homogeneous multi-phase structure. Simultaneously, the TiB2 phase significantly enhances fracture toughness via multi-scale toughening mechanisms including crack deflection and bridging. Notably, the three-dimensional interconnected conductive network constructed by TiB2 in the matrix, synergistically coupled with grain refinement effect, enhances the electrical conductivity of B4C-based composites. This research establishes a novel strategy for developing advanced ceramic composites with integrated high strength, high toughness, and functional characteristics through process-structure-property optimization, demonstrating significant application potential.