Effect of MgTi2O5 on Low Temperature Synthesis and Properties of Aluminum Titanate Ceramics
In this paper,pre-synthesized MgTi2O5 and MgO+2TiO2 in-situ synthesized MgTi2O5 were introduced as the additives required for the preparation of aluminum titanate ceramics,and the effect of MgTi2O5 on the phase composition and properties of aluminum titanate ceramics was studied.The results show that MgTi2O5 or MgO+2TiO2 can promote the synthesis of aluminum titanate at low temperature by forming solid solution,the addition of a small amount of MgTi2 O5 can effectively promote the synthesis of aluminum titanate crystals at a lower temperature.When the MgO content is 2％(mole fraction),the synthesis rate of aluminum titanate added with MgTi2O5 at 1 300 ℃ is 28.4 percentage point higher than that of MgO+2TiO2.On the premise of similar synthesis rate of aluminum titanate,the firing temperature of adding MgTi2O5 is lower than that of adding MgO+2TiO2.When 6％MgTi2O5 is added,the thermal expansion coefficient of the ceramic samples fired at 1 280～1 350℃is between-0.11 × 10-6 ℃-1 and 0.58 × 10-6 ℃-1.With the increase of firing temperature,due to the anisotropy and overgrowth of crystal,the microcracks inside crystal are easy to reduce the flexural strength of obtained aluminum titanate ceramics.
MgTi2O5aluminum titanatelow temperature synthesisfiring temperaturelow thermal expansioncrystal structure
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