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Porosity of porous Al alloys 总被引:12,自引:0,他引:12
Two porosity models of porous Al alloys with different pore types (ball and polygon shape) were established. The experimental results coincide well with theoretical computations. The porosity of Al alloys (Prc) consists of three parts, porosity caused by preform particles (Prp), additional porosity (Pra), and porosity caused by solidification shrinkage (Prs). Prp is the main part of Prc while Pra is the key for fabricating porous Al alloys successfully in spite of its little contribution to Prc. 相似文献
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为获得泡沫铝合金异型件, 以氢化钛热分解动力学方程为基础, 揭示了氢化钛二次热分解动力学规律与铝合金二次泡沫化(two steps foaming)之间的关系, 研究了氢化钛二次连续升温分解曲线和定温分解曲线, 并计算了氢的第二次泡沫化消耗率. 计算表明, 一次泡沫化后的氢化钛在第二次泡沫化过程中的热分解氢气产率可大于氢的第二次泡沫化消耗率. 理论及实验结果都表明: 二次泡沫化可以制备较高孔隙率的泡沫铝合金、异型件和三明治结构. 相似文献
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