Effect of Ball Milling on Reactive Microwave Sintering of MgO-TiO_2 System

In this paper, the effect of mechanical activation on microwave reactive sintering of MgO-TiO_2 system was investigated. Mixtures of MgO and TiO_2 powders were milled at different times. The as-received mixed powder and the 10h milled mixture were sintered in microwave between 1000-1400⁰C. Results showed that increasing the temperature up to 1400̊C for mixed powders could not give rise to complete formation of Magnesium titanate phases and unreacted raw materials were presented as the products. Also the densities of these samples were about 3 g/cm^3. With milling the reactants up to 10 h, it seems that the reactions could be completed at 1000⁰C and the density was augmented to 3.58 g/cm^3. Samples which have been sintered at 1400⁰C using a microwave furnace exhibited good microwave dielectric properties while εr and tan δ were 16.3 and 0.0001, respectively.