Microwave assisted preparation and sintering of Al2O3, ZrO2 and their composites from metalorganics
Controlled pyrolysis of Al(OBus)3 , Zr(OPrn)4 and their mixtures in ethyl acetate induced using microwaves of 2.45 GHz frequency has been carried out. Microwave irradiation yields second-stage precursors for the preparation of respective oxides and their composites. It is observed that the microwave irradiation has a directive influence on the morphology of the ultimate oxide products. Al2O3 , ZrO2 and the two composites 90% Al2O3–10% ZrO2 and 90% ZrO2–10% Al2O3 are also found to be sintered to very high densities within 35 min of microwave irradiation by the use of beta;-SiC as a secondary susceptor.