多相系统
晶界
材料科学
陶瓷
冶金
电气工程
工程类
微观结构
出处
期刊:Journal de physique. Colloque
[EDP Sciences]
日期:1985-04-01
卷期号:46 (C4): C4-59
被引量:12
标识
DOI:10.1051/jphyscol:1985404
摘要
The majority of polyphase ceramics contain a residual glass phase at their grain boundaries. The stability of these phases, particularly at the two-grain boundaries, is of significance since they affect the properties of the material as a whole. Drawing analogies with soap films, the stability of a continuous intergranular phase is considered in terms of the balance between the capillarity and disjoining pressures. The individual components to the disjoining pressures are discussed. It is argued that a large structural component to the disjoining pressure is responsible for the observed constancy of the thickness of its intergranular phase in polyphase silicon nitride ceramics. Mechanisms for the de-wetting of a grain boundary containing an intergranular glass phase are also discussed.
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