Abstract
The kinetics of the initial sintering and grain growth of magnesium oxide (MgO) prepared by the alkoxy-method were investigated by means of dilatometry, electron microscopy and the measurement of isothermal shrinkage. The obtained results are summarized as follows.
(1) The initial sintering kinetics of MgO were determined from 1000 to 1200°C. The sintering process was governed by the volume diffusion of oxygen ions which was represented by D=2.54×10-5exp(-64, 000/RT)cm2/sec.
(2) The grain growth of MgO was represented by the expression of G2-G02=kt, and the temperature dependence of k was given by k=3.3×10-3 exp(-77, 000/RT)em2/sec.
