摘要
金属-气体共晶定向凝固(Gasar)是一种制备规则多孔金属的新工艺.本工作通过分析气泡的生长条件,建立了藕状多孔结构形成的压力判据(H2气和Ar气分压比),并从实验上研究了凝固压力对气孔尺寸的影响规律.结果表明,随着凝固压力(气体总压)的增大,气孔平均直径不断降低.
Directional solidification of metal-gas eutectic （Gasar） is a novel process for fabricating porous metals with oriented pores parallel to the solidification direction. Through theoretically analyzing the pressure condition for a gas bubble to grow, a criterion （the ratio of the partial pressures of hydrogen to argon） for the formation of the lotus type porous structure has been established. The experimental results show that the mean pore diameter decreases with increasing solidification pressure （the overall gas pressure）.
出处
《金属学报》
SCIE
EI
CAS
CSCD
北大核心
2005年第8期886-890,共5页
Acta Metallurgica Sinica
基金
国家自然科学基金项目50404002国家重点基础研究专项2004CCA05100资助
关键词
多孔金属
藕状结构
定向凝固
共晶
镁
porous metal, lotus type structure, directional solidification, eutectic, magnesium
