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Open AccessArticle

Behavior and Mechanism of High-Temperature Stability between Tial-Based Alloy and Y2O3-Al2O3 Composite Crucibles

1
School of Materials Science and Engineering, Beihang University, Beijing 100191, China
2
China Aerospace Academy of Systems Science and Engineering, Beijing 100048, China
3
Capital Aerospace Machinery Co., Ltd., Beijing 100076, China
*
Authors to whom correspondence should be addressed.
Materials 2018, 11(7), 1107; https://doi.org/10.3390/ma11071107
Received: 25 May 2018 / Revised: 18 June 2018 / Accepted: 18 June 2018 / Published: 28 June 2018
(This article belongs to the Special Issue High Temperature Ceramic Materials)
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. View Full-Text
Keywords: Y2O3; Al2O3; composite crucible; interface reaction; TiAl-based alloy; stability behavior Y2O3; Al2O3; composite crucible; interface reaction; TiAl-based alloy; stability behavior
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Li, Q.; Zhang, H.; Cui, Y.; Yang, C.; Gao, M.; Li, J.; Zhang, H. Behavior and Mechanism of High-Temperature Stability between Tial-Based Alloy and Y2O3-Al2O3 Composite Crucibles. Materials 2018, 11, 1107.

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