Research on High Temperature Creep Properties of Al₂O₃-SiO₂ Ore (Al₂O₃ ~ 65)

Abstract:

High temperature creep properties of Al₂O₃-SiO₂ ore (65% Al₂O₃ by mass percentage, abbreviation for Al₂O₃~65) was studied. The results show that the creep rates at 1300 °C × 50h, 1400 °C × 50h and 1500 °C × 50h were-0.89% ,- 1.75%, - 5.76%,respectively. At 1300 °C, ore has good creep resistance. As the temperature increases, the high temperature creep resistance of Al₂O₃ ~ 65 bauxite ore is significantly reduced. Creep process can be divided into two stages: when the time t <30h, the sample are in the densification process; after 30 hours, the creep properties show that the relationship between time and the creep rate is linear. At 1300 °C, the absolute value which is the slope of the linear relationship is smaller, exhibited an excellent high-temperature creep resistance. The loading softening-temperature of Al₂O₃ ~ 65 bauxite ore is 1343 °C. The Sample phase and microstructure are characterized by X-ray diffraction and scanning electron microscopy (SEM). The results show that mullite reticular is formed in sample at 1300 °C; at this point, TiO₂ mostly exist as Rutile. At 1400 °C and 1500 °C, TiO₂ mostly exist as Aluminum titanate, Corundum phase portion into mullite.

• Periodical: Key Engineering Materials (Volume 680)
• Pages: 343-346
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.680.343
• Online since: February 2016
• Authors: Yong Qiang Sun, Yong Li*, Shuo Cao, Hao Bo Zhang, Chang He Gao, Ji Li Zhang
• Keywords: Curve Fitting, High-Alumina Bauxite, High-Temperature Creep, Mullite

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DOI: 10.1016/s1003-6326(14)63264-7

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