Effect of Open Porosity of Y2O3 Ceramic on the Apparent Contact Angles and Interactions Between Ti47Al Alloys and Y2O3 Ceramic
来源期刊：Acta Metallurgica Sinica2017年第5期
论文作者：Chao Ran Hua-rui Zhang Hu Zhang Bei-bei Wan Peng Bai
文章页码：456 - 463
摘 要：The effect of open porosity of Y2O3 ceramic on the apparent contact angle and interaction between molten Ti47 Al 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 Ti47 Al 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 lm, 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 Ti Al/Y2O3 interface.
Chao Ran1,2，Hua-rui Zhang1,2，Hu Zhang1,2，Bei-bei Wan1,2，Peng Bai1,2
1. School of Materials Science and Engineering, Beihang University2. Beijing Key Laboratory for Advanced Functional Material and Thin Film Technology, Beihang University
摘 要：The effect of open porosity of Y2O3 ceramic on the apparent contact angle and interaction between molten Ti47 Al 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 Ti47 Al 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 lm, 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 Ti Al/Y2O3 interface.
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