To obtain appropriate crucible materials for vacuum induction melting of MCrAlY alloys, four different oxide ceramics, including MgO, Y2O3, Al2O3, and ZrO2, with various microstructures were designed and characterized. The high-temperature wettability and interactions between Ni-20Co-20Cr-10Al-1.5Y alloys and oxide ceramics were studied by sessile drop experiments under vacuum. The results showed that all the systems exhibited non-wetting behavior. The contact angles were stable during the melting process of alloys and the equilibrium contact angles were 140° (MgO), 148° (Y2O3), 154° (Al2O3), and 157° (ZrO2), respectively. The interfacial reaction between the ceramic substrates and alloys occurred at high temperature. Though the ceramics had different microstructures, similar continuous Y2O3 reaction layer with thicknesses of about 25 μm at the alloy-ceramic interface in MgO, Al2O3, and ZrO2 systems formed. The average area percentage of oxides in the alloy matrices were 0.59% (MgO), 0.11% (Al2O3), 0.09% (ZrO2), and 0.02% (Y2O3), respectively. The alloys, after reacting with MgO ceramic, had the highest inclusion content, while those with the lowest content were in the Y2O3 system. Y2O3 ceramic was the most beneficial for vacuum induction melting of high-purity Y-containing Ni-based alloys.
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机译：为了获得适当的坩埚材料，用于麦芽腺素合金的真空诱导熔融，设计并表征了四种不同的氧化物陶瓷，包括MgO，Y 2 O 3，Al 2 O 3和ZrO2，具有各种微结构。通过真空的术语下降实验研究了Ni-20Co-20cr-10 -1.5Y-1.5Y合金和氧化物陶瓷之间的高温润湿性和相互作用。结果表明，所有系统都表现出非润湿行为。在合金的熔化过程中，接触角稳定，平衡接触角分别为140°（MgO），148°（Y2O3），154°（Al 2 O 3）和157°（ZrO2）。陶瓷基材和合金之间的界面反应在高温下发生。尽管陶瓷具有不同的微观结构，但在MgO，Al2O3和形成的ZrO2系统中，在MgO，Al2O3和ZrO2系统中的合金陶瓷界面处具有相似的连续Y2O3反应层，厚度为约25μm。合金基质中氧化物的平均面积百分比分别为0.59％（MgO），0.11％（Al 2 O 3），0.09％（ZrO2）和0.02％（Y2O3）。与MgO陶瓷反应后的合金具有最高的包容含量，而含量最低的那些在Y2O3系统中。 Y2O3陶瓷对于真空诱导含有高纯度Y的Ni基合金的真空感应熔化最有利。
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