气体压力和熔体过热度决定熔体中气体溶解量从而直接影响多孔试样的气孔率.通过理论分析建立了固/气共晶定向凝固中气体逸出和藕状多孔结构形成所需的过热度和气体压力判据.以金属/氢共晶为例,计算结果表明,过热度和氩气分压均应有一适中的范围:给定氢气和氩气分压时,过热度应高于藕孔形成临界过热度而低于氢气逸出临界过热度;给定过热度和氢气分压时,氩气分压应高于氢气逸出临界氩气分压而低于藕孔形成临界氩气分压.该分析结果从藕状多孔Mg的实验结果得到了验证,可以作为高质量规则多孔材料实际制备过程的工艺参数指导原则.
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