一种含锆高温合金与坩埚耐火材料的界面反应研究*

Interface Reaction Between a Zr Containing Superalloy and Crucible Refractory Material

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doi:10.13385/j.cnki.vacuum.2023.03.14

Abstract: The interface reaction between a Zr containing superalloy and different crucible refractory materials was investigated by dross test, scanning electron microscope(SEM) and energy dispersive spectroscopy(EDS). The results show that the ZrO₂ produced by the reaction between Zr in superalloy and oxide ceramic crucible is the main source of dross in alloy ingot. The thermodynamic stability of MgO crucible is lower than that of Al₂O₃ crucible, and its reaction with Zr is more intense, resulting in more ZrO₂ dross. The microstructure of crucible also has an important influence on the interfacial reaction. When the density of the crucible is high and the surface is smooth, the generated ZrO₂ is attached to the crucible surface to form a dense ZrO₂ layer, which prevents the further reaction between Zr and Al₂O₃ crucible. When the surface of the crucible is rough, it is difficult to form a dense ZrO₂ layer, and the generated ZrO₂ enters the alloy melt to form dross. Therefore, the use of Al₂O₃ crucible with high density, fine structure and good surface quality is conducive to reduce the reaction between superalloy and crucible refractory, and reduce the pollution of alloy ingot.

Key words: superalloy, refractory material, dross, interface reaction, Zr

CLC Number: TG249.5

ZHANG Feng-xiang, ZHANG Peng, LI Yi, MA Xiu-ping, LIU Dong-fang, WAN Xu-jie, ZHANG Hua-xia. Interface Reaction Between a Zr Containing Superalloy and Crucible Refractory Material[J].VACUUM, 2023, 60(3): 80-85.

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