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The paper presents a finite element method (FEM) of solid state sintering of aluminum oxide ceramics in an electric furnace. Alumina green bodies were prepared by slip casting of stable 70 wt.% Al2O3 aqueous suspension in a plaster (gypsum) mold. Dispersant Dolapix CE-64 was used for stabilization of highly concentrated alumina suspension. Sintering of green bodies was performed at temperatures of 1600 C, 1625 C and 1650 C for 2 h, 4 h and 6 h. The FEM model was solved as a nonlinear thermo-mechanical problem with the heating, sintering and cooling phases in the FEM program Comsol Mulitiphysics. The density of the sintered samples was determined by the Archimedes method and compared with the density predicted by FEM simulations. The concordance of numerically predicted and measured density amounts, for the same sintering parameters is 86 %.
aluminum oxide ceramics ; sintering ; Archimedesdensity ; FEM model
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