REACTION SINTERING OF AL2O3 IN THE PRESENCE OF THE LIQUID-PHASE

Reaction sintering of inactive alumina powders was investigated by usi ng three groups of additives, depending on their chemical composition. Most effective were those additives which, at lower temperatures and in smaller amounts, brought about densification up to the elimination of open pores. Hence the most effective among the additives used were oxide mixtures without SiO2, followed by oxide mixtures with SiO2 and finally mixtures of oxides and nitrides.