材料科学
烧结
陶瓷
同质性(统计学)
粒度
晶粒生长
晶界扩散系数
相对密度
晶界
打滑(空气动力学)
晶界强化
晶粒异常长大
粒度分布
复合材料
冶金
矿物学
微观结构
粒径
化学工程
热力学
化学
工程类
统计
数学
物理
作者
Guillaume Bernard‐Granger,C. Guizard
出处
期刊:Acta Materialia
[Elsevier]
日期:2008-12-01
卷期号:56 (20): 6273-6282
被引量:43
标识
DOI:10.1016/j.actamat.2008.08.054
摘要
New relationships between grain size and relative density have been established for the case of solid-state sintering of ceramic powders. These new expressions have been used to fit experimental points, obtained during solid-state sintering of a pure submicronic α-alumina powder shaped by slip casting. In contrast to what was established in the past, it is shown that densification is controlled by grain boundary diffusion and grain growth is controlled by the grain boundaries. The quality of the green state (homogeneity of the pore size and homogeneity of the spatial distribution of pores) is used to explain the difference between the results reported here and previous results, where diffusion at the surface of the pores was claimed to control grain growth.
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