Microwave Sintering of Magnesium Titanate Dielectric Ceramics

First Mg2TiO4 and CaTiO3 powders were prepared by solid state reaction method,and then they were sintered in the microwave stove with 1.5wt% CuO as sintering additives.Density,capacity,dielectric loss,crystal composition and microstructure of the sintering body were ananlyzed by means of Archimedes drainage method,resistance analysis,XRD and SEM.The results showed that microwave sintering technology shortened the sintering period obviously and possessed the sintering body with good sintering and dielectric properties.When sintered at 1 310 ℃ for 45 min,the sintering body had good dielectric properties with dielectric constant of 19.19 and dielectric loss of 0.002 2.The major phase of the sintering body was Mg2TiO4,the second phase was CaTiO3 which growed poorly when sintered by microwave,and a small amount of MgTiO3 had been found at the same time.