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<p>The alumina could dissolve into the magnesia–alumina spinel when the Al<sub>2</sub>O<sub>3</sub> content of spinel does not reach the theoretical maximum content at a certain temperature. The effect of spinel solid solution behavior on the bonding between CaO·6Al<sub>2</sub>O<sub>3</sub> and spinel, and consequently on the castable strength following sintering at various temperatures, has been investigated. The results indicate that 72-spinel (containing 72&#xa0;wt.% alumina) exhibits no significant solid solution after heat treatment at 1400&#xa0;°C but shows alumina dissolving into spinel at 1500 and 1600&#xa0;°C, forming a “spinel–alumina” bridging structure. In contrast, 78-spinel shows no solid solution behavior at any tested temperature. Upon incorporating 72-spinel, the alumina in the “spinel–alumina” bridging structure reacts with CaO·2Al<sub>2</sub>O<sub>3</sub> during sintering, which leads to the formation of a “spinel–CaO·6Al<sub>2</sub>O<sub>3</sub>” bridging structure, enhancing matrix connectivity and mechanical strength. Thus, castable containing 72-spinel exhibit higher strength than castables containing 78-spinel after sintering at 1500 and 1600&#xa0;°C.</p>

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Effect of magnesia–alumina spinel solution behavior on microstructure of CAC-bonded castables

  • 期刊论文

  • 发表日期：

    2026年5月8日

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  • Zhong-Zhuang Zhang,
  • Ya-Ning Zhao,
  • You-Qi Li,
  • Yao-Zheng Li,
  • Jia-Jia Tian,
  • Zhong-Tao Luo,
  • Guo-Tian Ye,
  • Da-Kuo Feng,
  • Cheng-Liang Ma,
  • Yuan-Dong Mu

摘要

The alumina could dissolve into the magnesia–alumina spinel when the Al2O3 content of spinel does not reach the theoretical maximum content at a certain temperature. The effect of spinel solid solution behavior on the bonding between CaO·6Al2O3 and spinel, and consequently on the castable strength following sintering at various temperatures, has been investigated. The results indicate that 72-spinel (containing 72 wt.% alumina) exhibits no significant solid solution after heat treatment at 1400 °C but shows alumina dissolving into spinel at 1500 and 1600 °C, forming a “spinel–alumina” bridging structure. In contrast, 78-spinel shows no solid solution behavior at any tested temperature. Upon incorporating 72-spinel, the alumina in the “spinel–alumina” bridging structure reacts with CaO·2Al2O3 during sintering, which leads to the formation of a “spinel–CaO·6Al2O3” bridging structure, enhancing matrix connectivity and mechanical strength. Thus, castable containing 72-spinel exhibit higher strength than castables containing 78-spinel after sintering at 1500 and 1600 °C.