Effect of MgTi2O5 on Low Temperature Synthesis and Properties of Aluminum Titanate Ceramics

Abstract

Abstract: 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 MgTi₂O₅ 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.

Key words: MgTi₂O₅, aluminum titanate, low temperature synthesis, firing temperature, low thermal expansion, crystal structure

CLC Number:

TQ174

ZHANG Hongquan, CHENG Guangjian, WEN Jin, CHEN Pengjie. Effect of MgTi₂O₅ on Low Temperature Synthesis and Properties of Aluminum Titanate Ceramics[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2024, 43(12): 4545-4552.

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Effect of MgTi₂O₅ on Low Temperature Synthesis and Properties of Aluminum Titanate Ceramics

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