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The free sintering of alumina (the sintering of free powder) was studied by measuring the surface area change with the BET method in the temperature range of 1035°C-1250°C. A kinetic equation describing the change of surface area was developed under the assumption that the neck growth and the surface flattening take place concurrently by the surface diffusion mechanism only. The analysis of the data with the kinetic equation showed that the surface area decreased first by the flattening and then by the neck growth. The surface diffusion coefficient obtained was given as Ds=2.83×103 exp (-114.1/RT).

The surface diffusion coefficient of Al2O3 obtained by free sintering.