中國(guó)有色金屬學(xué)報(bào)(英文版)
Transactions of Nonferrous Metals Society of China
| Vol. 13 No. 4 August 2003 |
Theoretical analysis of bubble nucleation in GASAR materials
LIU Yuan(劉 源), LI Yanxiang(李言祥)
（Department of Mechanical Engineering,
Tsinghua University, Beijing 100084, China）
Abstract:Nucleation of gaseous hydrogen bubbles is the initial stage of GASAR process. Through the theoretical analysis, it has been identified that heterogeneous nucleation of bubbles as caps on the solid surfaces of impurities is impossible and only the heterogeneous nucleation in pits and cracks in impurities is the most feasible way in the GASAR process. The results also show that the probability of bubble nucleation progressively decreases from Al, Cu and Ni to Fe molten metal, which is the result of the increasing adhesion work of liquid metal on alumina.
Key words: GASAR; porous metal; bubble nucleation
