Abstract
The kinetics of hot pressing of Al2O3 with and without MgO additives have been measured at 1475 and 1630° C and at 5 to 20 MPa using Al2O3 powders of different grain size and using different additive levels. Data obtained within the solid solution regime are interpreted in terms of diffusional creep processes. MgO additions accelerate densification within this regime; the consequent reduction in pore size, and hence in pore drag, can explain the function of MgO as sintering additive for Al2O3.
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Harmer, M.P., Brook, R.J. The effect of MgO additions on the kinetics of hot pressing in Al2O3 . J Mater Sci 15, 3017–3024 (1980). https://doi.org/10.1007/BF00550370
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DOI: https://doi.org/10.1007/BF00550370