Properties of BaZrO_3 microwave dielectric ceramic sintered at low temperature with CaO-MgO-SiO_2-B_2O_3 sintering aid

Using CaO-MgO-SiO2-B2O3 (CMSB) glass as sintering aid, BaZrO3 microwave dielectric ceramics were prepared by low temperature sintering. The effects of CMSB addition amount on sintering temperature, microstructure and properties of BaZrO3 ceramic were studied. The results indicate that the sintering temperature of BaZrO3 ceramic is decreased greatly owing to the addition of CMSB glass. When the mass fraction of CMSB addition is 33%, the sintering temperature of the prepared ceramic decreases to 910 ℃ , and the ceramic is very dense with the density of 4.32 g/cm3. Under the condition of 1 MHz frequency, the Q value attains to 4 000. This ceramic is used for the mass production of microwave ceramic capacitors with high Q value.