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<p>Y<sub>2</sub>O<sub>3</sub>-enhanced MgO refractory crucibles were fabricated based on a novel design of Y<sub>2</sub>O<sub>3</sub> crystal boundary-enhanced magnesia raw materials, and the interface reactions between the Y<sub>2</sub>O<sub>3</sub>-enhanced MgO refractory crucibles and Ni–TiAl superalloy were explored. Micro-CT analysis revealed no substantial infiltration or structural damage to the crucible after two cycles of melting. Y<sub>2</sub>O<sub>3</sub> was found to uniformly distribute along MgO grain boundaries, forming a protective core–shell structure that effectively isolates MgO grains from direct contact with the alloy melt. This unique core–shell structure significantly enhanced the crucible’s corrosion resistance. Furthermore, a dense MgCr<sub>2</sub>O<sub>4</sub> spinel layer formed at the alloy–crucible interface, serving as a robust barrier against further refractory corrosion. The utilization of high-purity magnesia from Salt Lake resources not only minimized impurity-driven interfacial reactions but also endowed the crucible with superior performance.</p>

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Y2O3-enhanced MgO refractory crucibles prepared by Salt Lake magnesium resources and its interface reactions with Ni–TiAl superalloy

  • 期刊论文

  • 发表日期：

    2026年3月30日

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  • Hu-Tang Zhong,
  • Yi-Fei Du,
  • Jun-Feng Chen,
  • Bin-Bin Dong,
  • Jia-Wei Wei,
  • Bing-Qiang Han,
  • Wen Yan,
  • Shao-Wei Zhang,
  • Bing-Xin Wu,
  • Nan Li

摘要

Y2O3-enhanced MgO refractory crucibles were fabricated based on a novel design of Y2O3 crystal boundary-enhanced magnesia raw materials, and the interface reactions between the Y2O3-enhanced MgO refractory crucibles and Ni–TiAl superalloy were explored. Micro-CT analysis revealed no substantial infiltration or structural damage to the crucible after two cycles of melting. Y2O3 was found to uniformly distribute along MgO grain boundaries, forming a protective core–shell structure that effectively isolates MgO grains from direct contact with the alloy melt. This unique core–shell structure significantly enhanced the crucible’s corrosion resistance. Furthermore, a dense MgCr2O4 spinel layer formed at the alloy–crucible interface, serving as a robust barrier against further refractory corrosion. The utilization of high-purity magnesia from Salt Lake resources not only minimized impurity-driven interfacial reactions but also endowed the crucible with superior performance.