Li Qingling, Zhang Huarui, Cui Yongshuang, Yang Chunlei, Gao Ming, Li Jinpeng, Zhang Hu
School of Materials Science and Engineering, Beihang University, Beijing 100191, China.
China Aerospace Academy of Systems Science and Engineering, Beijing 100048, China.
Materials (Basel). 2018 Jun 28;11(7):1107. doi: 10.3390/ma11071107.
In this work, Y₂O₃ based composite crucibles with different Al₂O₃ contents were designed and characterized. The stability behaviors and interaction mechanisms between molten Ti-47Al-2Cr-2Nb alloy and Y₂O₃-Al₂O₃ composite crucibles were investigated at high temperature. Results showed that the surface morphology of crucibles and the degree of interfacial reactions between the composite crucibles and the metal melts varied with the change of Al₂O₃ content in the crucible matrix. The pure Y₂O₃ crucible was the densest and its chemical stability was the highest. With the increase in Al₂O₃ content, the number of pores on the crucibles surface gradually increased and the interfacial reactions between the composite crucibles and the molten alloys became weaker. When the content of Al₂O₃ in composite crucibles increased from 3.5 wt % to 10.5 wt %, the thickness of the interface layer of melt-crucible decreased from 150 µm to 50 µm, and the equilibrium contact angles between metal and crucibles gradually decreased from 69.3° to 64.2° at 1873 K.
在这项工作中，设计并表征了具有不同Al₂O₃含量的Y₂O₃基复合坩埚。研究了高温下Ti-47Al-2Cr-2Nb熔融合金与Y₂O₃-Al₂O₃复合坩埚之间的稳定性行为和相互作用机制。结果表明，坩埚的表面形貌以及复合坩埚与金属熔体之间的界面反应程度随坩埚基体中Al₂O₃含量的变化而变化。纯Y₂O₃坩埚最致密，其化学稳定性最高。随着Al₂O₃含量的增加，坩埚表面的气孔数量逐渐增加，复合坩埚与熔融合金之间的界面反应变弱。当复合坩埚中Al₂O₃的含量从3.5 wt%增加到10.5 wt%时，熔体-坩埚界面层的厚度从150μm减小到50μm，在1873 K时金属与坩埚之间的平衡接触角从69.3°逐渐减小到64.2°。
