采用金属/气体共晶定向凝固工艺(Gasar),在不同氢气压力条件下制备了藕状多孔Cu-Cr合金,研究了氢气压力对藕状多孔Cu-Cr合金气孔结构和形貌因子的影响.结果表明,当氢气压力大于气孔形成临界压力时,随氢气压力的增大,气孔率和孔隙密度增大,而平均气孔直径缓慢减小;当氢气压力大于气体逸出临界压力时,气孔率和平均气孔直径急剧减小,而孔隙密度大幅增加;此外,随氢气压力的增加,气孔形貌因子逐渐减小.
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