Influence of Mg O and B₂O₃ addition on reaction sintering, properties and microstructure of Aluminum titanate

The effect of Mg O and B₂O₃ on the formation, physical properties, phase analysis and microstructure of aluminum titanate was investigated. Density results showed the sample containing of 1 wt percent B₂O₃ and 2 wt percent Mg O leads to the highest density while the lowest density was seen in samples containing 1 wt percent B₂O₃ compared to pure aluminum titanate. Regarding the phase analysis of samples, Mg O was found most effective additive on reaction sintering of aluminum titanate through the intermediate phases. Furthermore at the temperatures above 1350^deg^C, B₂O₃ promote the formation reaction of aluminum titanate. Microstructural analysis showed the samples containing Mg O are fine grain and homogeneous. Thermal expansion coefficient of samples with additives is greater than pure aluminum titanate. Pure aluminum titanate samples and one containing B₂O₃ additive decompose to Al₂O₃ and TiO₂ after 5 hours heat treatment at 1150^deg^C while the samples containing 2 wt percent Mg O was stable even after 25 hours