Scholarlink

<p>Mullite composite ceramics are promising materials for modern high-temperature metallurgical applications owing to their high density, elevated melting point, and minimum thermal expansion coefficient. However, their practical utility is often limited by insufficient high-temperature strength and inadequate thermal shock resistance. To address these issues, this study fabricates mullite composite ceramics with varying nano-ZrO<sub>2</sub> contents using a ceramics method, aiming to elucidate the role of nano-ZrO<sub>2</sub> in promoting the tailoring of microstructural architecture, as well as the underlying mechanisms governing high-temperature performance. The results indicate that the nano-ZrO<sub>2</sub> promotes the formation of a plate-like calcium hexaluminate (CA<sub>6</sub>) network with a high aspect ratio through heterogeneous nucleation with solute-driven growth, and the median pore diameter decreasing from 7.91&#xa0;μm to 2.83&#xa0;μm and the pore volume distribution in the 2–15&#xa0;μm from 5.37 to 177.16 µm<sup>3</sup> to 5.45–32.67 µm<sup>3</sup>. Consequently, the evolution the hot modulus of rupture (HMOR) and the residual cold modulus of rupture (CMOR) after thermal shock increase by 95.0% and 62.1%, respectively, while the slag erosion resistance index decreases by 48.8%. The properties enhancement of ceramics can be due to the formation of plate-like CA<sub>6</sub> network with a high aspect ratio and the pore structure This work provides a technologically viable strategy for the development of advanced high-temperature ceramics with enhanced reliability and extended service life.</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 high-temperature performance of mullite composite ceramics with nano-ZrO2 by tailoring of microstructural architecture

  • 期刊论文

  • 出版模式：

    开放获取

  • 发表日期：

    2026年7月4日

查看全文
  • Pingan Chen,
  • Shien Li,
  • Yingli Zhu,
  • Fu Chen,
  • Mengke Qiao,
  • Jiang Wu,
  • Gangtao Luo,
  • Xiangcheng Li

摘要

Mullite composite ceramics are promising materials for modern high-temperature metallurgical applications owing to their high density, elevated melting point, and minimum thermal expansion coefficient. However, their practical utility is often limited by insufficient high-temperature strength and inadequate thermal shock resistance. To address these issues, this study fabricates mullite composite ceramics with varying nano-ZrO2 contents using a ceramics method, aiming to elucidate the role of nano-ZrO2 in promoting the tailoring of microstructural architecture, as well as the underlying mechanisms governing high-temperature performance. The results indicate that the nano-ZrO2 promotes the formation of a plate-like calcium hexaluminate (CA6) network with a high aspect ratio through heterogeneous nucleation with solute-driven growth, and the median pore diameter decreasing from 7.91 μm to 2.83 μm and the pore volume distribution in the 2–15 μm from 5.37 to 177.16 µm3 to 5.45–32.67 µm3. Consequently, the evolution the hot modulus of rupture (HMOR) and the residual cold modulus of rupture (CMOR) after thermal shock increase by 95.0% and 62.1%, respectively, while the slag erosion resistance index decreases by 48.8%. The properties enhancement of ceramics can be due to the formation of plate-like CA6 network with a high aspect ratio and the pore structure This work provides a technologically viable strategy for the development of advanced high-temperature ceramics with enhanced reliability and extended service life.