Investigation on Phase Transition of Al2O3 Doped with TiO2 and SiO2

Abstract

Abstract: TiO₂, SiO₂ and TiO₂ + SiO₂ doped Al₂O₃ powders were prepared by ball milling. After calcination at different temperatures, X-ray diffraction (XRD) tests were carried out, and the effects of these three kinds of doping on the phase transition temperature of Al₂O₃ powder were compared. The results show that TiO₂ and SiO₂ doping promote the phase transition from γ-Al₂O₃ to α-Al₂O₃ effectively. In the case of doping mass fraction of 0.5%, temperatures of γ-Al₂O₃ to α-Al₂O₃ are reduced by 100 ℃ and 125 ℃ respectively. The effect of TiO₂+ SiO₂ co-doping on the phase transition of Al₂O₃ is better than that of TiO₂ and SiO₂ alone. The doping of 0.3% (mass fraction) TiO₂ and 0.3% (mass fraction) SiO₂ reduces the temperature of γ-Al₂O₃ to α-Al₂O₃ by 150 ℃. In addition, the mechanism of TiO₂, SiO₂ and TiO₂+SiO₂ doping to promote the phase transformation of Al₂O₃ powder was analyzed.

Key words: Al₂O₃ powder, phase transition, TiO₂, SiO₂, doping

CLC Number:

TQ174

LIN Congyi, SUN Xiaoman, LI Wei. Investigation on Phase Transition of Al₂O₃ Doped with TiO₂ and SiO₂[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2021, 40(2): 587-590.

References

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Investigation on Phase Transition of Al₂O₃ Doped with TiO₂ and SiO₂

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