Scholarlink

<p>The exceptional properties of h-BN based ceramics are fundamental to their advancement in practical applications. The introduction of Al<sub>3</sub>BC<sub>3</sub> into h-BN based ceramics effectively enhanced the thermal shock resistance and maintained the mechanical integrity. h-BN based ceramics were fabricated using a discharge plasma sintering process, wherein the residual flexural strength ratio of all specimens exceeded 100% when incorporating varying amounts of Al<sub>3</sub>BC<sub>3</sub>. Furthermore, parameters <i>R</i> and <InlineEquation ID="IEq30"> <EquationSource Format="TEX">\(R^{\prime}\)</EquationSource> <EquationSource Format="MATHML"><math> <msup> <mi>R</mi> <mo>′</mo> </msup> </math></EquationSource> </InlineEquation> were examined to describe the crack initiation and propagation induced by thermal strain under steady-state heat flux, respectively. The observed improvements in residual flexural strength at elevated thermal shock temperatures can be primarily attributed to the matrix evolution through the formation of an in-situ reinforcing phase, along with the generation of Al<sub>18</sub>B<sub>4</sub>O<sub>33</sub> whiskers via surface oxidation. At a content of 30 wt.% Al<sub>3</sub>BC<sub>3</sub>, the optimized values for residual flexural strength and the corresponding ratio, when temperature difference reached 1200&#xa0;°C, were measured at 252.4&#xa0;MPa and 110.1%, respectively.</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

Enhanced thermal shock resistance of SPS sintered h-BN based ceramics with Al3BC3 addition

  • 期刊论文

  • 发表日期：

    2026年1月12日

查看全文
  • Hao-Tian Li,
  • Chao Yu,
  • Hao Yan,
  • Xu Cheng,
  • Jun Ding,
  • Zheng-Long Liu,
  • Bei-Yue Ma,
  • Hong-Xi Zhu,
  • Cheng-Ji Deng

摘要

The exceptional properties of h-BN based ceramics are fundamental to their advancement in practical applications. The introduction of Al3BC3 into h-BN based ceramics effectively enhanced the thermal shock resistance and maintained the mechanical integrity. h-BN based ceramics were fabricated using a discharge plasma sintering process, wherein the residual flexural strength ratio of all specimens exceeded 100% when incorporating varying amounts of Al3BC3. Furthermore, parameters R and \(R^{\prime}\) R ′ were examined to describe the crack initiation and propagation induced by thermal strain under steady-state heat flux, respectively. The observed improvements in residual flexural strength at elevated thermal shock temperatures can be primarily attributed to the matrix evolution through the formation of an in-situ reinforcing phase, along with the generation of Al18B4O33 whiskers via surface oxidation. At a content of 30 wt.% Al3BC3, the optimized values for residual flexural strength and the corresponding ratio, when temperature difference reached 1200 °C, were measured at 252.4 MPa and 110.1%, respectively.