Abstract
The effect of open porosity of Y2O3 ceramic on the apparent contact angle and interaction between molten Ti47Al alloy and Y2O3 ceramic substrates under pure Ar was investigated by using a sessile drop method at 1600 °C. As the open porosity increased from 9.6% to 30.3%, the spreading rate of molten Ti47Al alloys on Y2O3 ceramic substrates reduced from 2.3 to 1.1°/s; meanwhile, the final equilibrium contact angles increased from 55.8° to 63.6°. The microstructure observations revealed that with increasing the open porosity of the Y2O3 substrates, the thickness of sand adhesion at the interfaces of the alloy droplets increased from 5.4 to 15.7 μm, and ceramic particles in the alloy matrix increased as well. The increasing contact area between the molten alloy and the substrate played a dominant role in determining the interaction on TiAl/Y2O3 interface.
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Acknowledgements
The authors gratefully acknowledge the financial support of the "National Science & Technology Pillar Program of China" project of PR China (No. 2013BAB11B04), the National Natural Science Foundation of China (Grant No. 51404017) and the State Key Laboratory of Refractories and Metallurgy, Wuhan University of Science and Technology. Further, the authors wish to express their appreciations to the group of Prof. Ping Shen of Department of Materials Science and Engineering, Jilin University, for the help of the wetting experiments.
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Ran, C., Zhang, Hr., Zhang, H. et al. Effect of Open Porosity of Y2O3 Ceramic on the Apparent Contact Angles and Interactions Between Ti47Al Alloys and Y2O3 Ceramic. Acta Metall. Sin. (Engl. Lett.) 30, 456–463 (2017). https://doi.org/10.1007/s40195-016-0511-1
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DOI: https://doi.org/10.1007/s40195-016-0511-1