Quantitative Analysis of Hierarchical Pores in Powder Compact
Quantitative Analysis of Hierarchical Pores in Powder Compact
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粉末压块中分级孔隙的定量分析
DOI：
10.2109/jcersj.98.126
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发表时间：
1990
期刊：
影响因子：
--
通讯作者：
R. Kikuchi
中科院分区：
文献类型：
--
作者：
Y. Hirata;I. Aksay;R. Kikuchi
采用分级聚集球形颗粒的FCC模型对粉末压坯中的孔结构进行了理论分析。推导出的理论可以揭示第一代孔隙(包含在初级颗粒团中)和第二代或第三代孔隙(包含在第一代或第二代颗粒团中)的孔体积和孔径分布。计算结果表明，颗粒团簇尺寸的减小导致形成了平均尺寸较小、堆积密度较高、孔径分布较窄的可烧结生坯。将所得的孔结构概念与过滤球形莫来石颗粒胶体悬浮液(平均尺寸为65 nm)所得到的生坯的孔径分布进行了比较。理论预测与实验结果吻合较好。
Theoretical analysis on the pore structure in a powder compact was made with an F. C. C. model of hierarchically clustered spherical particles. The derived theory can reveal the pore volume and pore size distribution of 1st generation pores (contained within clusters of primary particles) and 2nd or 3rd generation pores (contained among the 1st or 2nd generation particle clusters). The calculated results concluded that reduction in the size of particle cluster leads to the formation of a sinterable green compact with a narrow pore size distribution of small average size and high packing density. The derived concept on the pore structure was compared with the pore size distributions of the green compacts consolidated by filtration of colloidal suspensions of spherical mullite particles (average size 65nm). A good agreement was recognized between the theoretical prediction and experimental results.