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Exudation of Silicate Liquid from Polycrystalline Alumina

  • N. Ravishankar (a1), Jeffrey K. Farrer (a1) and C. Barry Carter (a1)


The presence of a liquid film at grain boundaries affects the mechanical properties of the material. One of the ways to eliminate the liquid film is to exude it from the grain boundaries to the free surface of the material. The present paper presents results on the exudation of a liquid silicate from grain boundaries in polycrystalline alumina. The results are compared to exudation behavior from bicrystals of alumina. This approach is very useful in understanding the mechanism of the exudation process.



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