Experimental Study on Hydrogen Diffusion in molten Aluminum
An innovative method which determines the equivalent diffusion coefficient of the hydrogen in molten aluminum is presented in this paper. The molten aluminum is placed in a permeable porous crucible. The vacuum is created outside of the crucible and the hydrogen in the molten aluminum will diffuses through the porous crucible wall out under the function of the hydrogen concentration gradient. The hydrogen contents in the molten aluminum decrease with vacuuming time. The relationship between equivalent diffusion coefficient and average hydrogen contents can be determined by solving Ficks diffusion equation at polar coordinate under certain initial and boundary conditions. Experiments were carried out to test the hydrogen contents at different times and obtain the equivalent diffusion coefficient of the hydrogen in molten A357 alloy. The values of (9.4-10.2)×10-3cm2/s are estimated for the equivalent diffusion coefficient at the temperature of 700-730℃.
Luwen Tang Jianmin Zeng Shengyao Lin
Key Lab.of Nonferrous Materials and New Processing Technology, Guangxi University,Nanning, P.R.China
国际会议
桂林
英文
1-5
2010-11-16（万方平台首次上网日期，不代表论文的发表时间）