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Isothermal sintering of Ba(Mg1/3, Ta2/3)O3 and ZrO2 doped with Y2O3 was studied at various heating rates. Rapid heating was much effective in promoting densification process of Ba (Mg1/3, Ta2/3)O3. X-ray diffraction, SEM observation and BET measurement showed that the rapid heating stimulated effectively the sintering of secondary particles whereas the slow heating contributed only to that of primary particles. When specimens were rapidly heated to the sintering temperature, the surface area of specimens did not change during the process of temperature increase. This resulted in a large shrinkage at the sintering temperature. When the specimens were heated slowly to the sintering temperature, the surface area was significantly reduced before reaching the sintering temperature and the densification was retarded.

Effect of Heating Rate on the Shrinkage of Isothermal Sintering