Effect of Trace O Element on High-temperature Wettability Between Ni₃Al Melt and Y₂O₃ Ceramic

Peng Bai^1,2，Hua-Rui Zhang^1,2，Bei-Bei Wan^1,2，Chao Ran^1,2，Hu Zhang^1,2

1. School of Materials Science and Engineering, Beihang University2. Beijing Key Laboratory for Advanced Functional Material and Thin Film Technology, Beihang University

摘 要：Effect of trace O element on the high-temperature wettability between Ni₃Al scrap melt and Y₂O₃ ceramic at 1873 K is investigated. With the increase in O content in Ni₃Al scrap melt from 6 to 21 ppm, the equilibrium contact angle decreases from 93.3° to 88.9°. The initial surface tension and adhesive work of molten Ni₃Al scrap drop from 3153.5 to 807.4 mN m^-1 and from 2974.6 to 882.2 mN m^-1, respectively. The average spreading rate increases from 0.03° s^-1 to 0.17° s^-1. The whole wetting processes are divided into four periods. The main driving force for spreading in period（1） is the adsorption and diffusion of active atoms around the interface. Trace O content in Ni₃Al scrap has a significant impact on interfacial reactions which mostly take place in the second stage, and can accelerate the spreading process on Y₂O₃ substrate. The reaction products during wetting process are Y₃Al₅O₁₂, YAlO₃ and Al₂O₃.

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