Abstract
Highly dense MgO ceramics were fabricated by two step pressureless sintering without sintering additives, and their sintering kinetics and grain growth behavior were studied. The results indicate that a “kinetic window” in which the grain growth is suppressed exists. An activation energy Q=196.39±5.76kJmol−1 for grain growth is estimated. In the two step sintering with optimized parameters, high dense (relative density 98.0%) samples with both a mean grain size of 21±2um and mean hardness Hv=6.1±0.2GPa are obtained.
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