Wetting behavior of Al alloys on a TiH2 substrate |
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Authors: | Dawu Li Jie Li Xiaoming Zhang Ting Sun Guangchun Yao |
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Affiliation: | 1. Department of Materials and Metallurgical Engineering, Engineering Faculty, Semnan University, 35131-19111, Iran;2. Czech Technical University in Prague, Faculty of Civil Engineering, Department of Mechanics, Thákurova 2077/7, 166 29 Prague, Czech Republic |
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Abstract: | The wetting behavior of Al–Ge alloys on TiH2 substrates was investigated by an improved sessile drop method under high vacuum and in a temperature range of 773–818 K. Results indicate that the equilibrium contact angles of Al–Ge/TiH2 increase linearly with temperature according to the following formula: θ = 0.2882T ? 85.04, and decrease linearly as the Ge content increases from 25.2% to 36.2% according to the formula: θ = 214 ? 200Ge (wt.%). The worst wetting behavior was obtained for a pure Al/TiH2 system at its foaming temperature (973 K). TiH2 particles were prone to aggregate and were thus difficult to disperse. This could be one of the reasons for closed-cell aluminum foam products having non-uniform pores. |
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