Expressions for the sintering rate in liquid‐phase sintering are derived for coupled‐interface dissolution and liquid‐phase diffusion. The analysis reveals the important role of stress gradients in the grain boundary phase and also shows that such gradients cannot be supplied by liquid‐phase flow. Stress‐supporting structure in the grain boundary phase is thus implied. The probable existence of such structure is revealed by diffuse dark‐field scattering studies, using transmission electron microscopy, on partially sintered alumina/anorthite bodies.
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Marion et al. (1987) studied this question.
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