| Theoretical analysis of bubble nucleation in GASAR materials |
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| 作者姓名： | 刘源 李言祥 |
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| 作者单位： | Department of Mechanical Engineering，Department of Mechanical Engineering Tsinghua University，Beijing 100084，China，Tsinghua University，Beijing 100084，China |
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| 基金项目： | Project(2 0 0 2 0 0 0 3086)supportbytheDoctoralFoundationandPost DoctoralFoundationofChina |
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| 摘 要： | 1 INTRODUCTIONPorousmaterialscanbeproducedbyusinganov elmethodcalledGASARdevelopedintheDne propetrovskMetallurgicalInstitute (DMI )ofUkraine1] .Mostmetal hydrogenbinarysystemshaveaeutecticdecompositionsimilartotheclassicaleutecticsystem .Thesemetalscanbemelted ,saturat edwithhydrogen ,andthendirectionallysolidified ,asshowninFig .12 ] .TheporosityofthesolidifiedGASARmaterialscanbevariedthroughprocessvari ablessuchaspressure ,rateanddirectionofcoolinginaprocessbasedongas solideut…
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Theoretical analysis of bubble nucleation in GASAR materials |
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| LIU Yuan,LI Yanxiang.Theoretical analysis of bubble nucleation in GASAR materials[J].Transactions of Nonferrous Metals Society of China,2003,13(4). |
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| Authors: | LIU Yuan LI Yanxiang |
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| 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. |
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| Keywords: | GASAR porous metal bubble nucleation |
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