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Materials 2018, 11(5), 749; https://doi.org/10.3390/ma11050749

High-Temperature Wettability and Interactions between Y-Containing Ni-Based Alloys and Various Oxide Ceramics

1
School of Materials Science and Engineering, Beihang University, Beijing 100191, China
2
Qingdao Institute of New Material technology of Beihang University, Qingdao 266000, China
*
Authors to whom correspondence should be addressed.
Received: 19 April 2018 / Revised: 29 April 2018 / Accepted: 4 May 2018 / Published: 7 May 2018
(This article belongs to the Special Issue High Temperature Ceramic Materials)
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Abstract

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. View Full-Text
Keywords: high temperature ceramic; high-temperature wettability; interfacial interaction; MCrAlY alloys high temperature ceramic; high-temperature wettability; interfacial interaction; MCrAlY alloys
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Li, J.; Zhang, H.; Gao, M.; Li, Q.; Bian, W.; Tao, T.; Zhang, H. High-Temperature Wettability and Interactions between Y-Containing Ni-Based Alloys and Various Oxide Ceramics. Materials 2018, 11, 749.

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