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- Title
煅烧硫酸铝铵复盐低温合成α-Al<sub>2</sub>O<sub>3</sub>-葡萄糖和预压的影响.
- Authors
张 鹏; 李 蔚; 陶宏磊
- Abstract
Aluminum is a widely used material in the industries of electronics, automobiles, and aviation due to its excellent properties. However, the synthetic temperature of commercial α-Al2O3 powder is high, and the obtained powder has coarse particles, low activity, serious agglomeration, and it is not easy to disperse, which affects its subsequent applications. Therefore, the synthesis of α-Al2O3 powder at a low temperature is challenging. In this paper, α-Al2O3 powder was synthesized by calcining NH4Al(SO4)2·12H2O with different added glucose contents. The effects of glucose content and sample pre-pressing on the synthetic temperature of α-Al2O3 powder were investigated. The results showed that the presence of glucose changed the phase transition process and significantly decreased the synthetic temperature. With 30% (mass fraction) glucose added, α-Al2O3 powder could be synthesized at 950 ℃, which was about 200 ℃ lower than that of the glucose-free control. With 75% glucose added, the synthetic temperature of α- Al2O3 further decreased to 900 ℃. The presence of glucose is believed to accelerate the thermal decomposition of NH4Al(SO4)2·12H2O, and make NH4Al(SO4)2·12H2O be dispersed evenly and amorphous. The results also showed that pre-pressing further decreased the synthetic temperature of α-Al2O3 by 25 --50 ℃, which might be a result of the attenuation of agglomeration and the further homogenization of powder dispersion. Moreover, single-phase α-Al2O3 with a uniform distribution of particle size (average particle size 110 nm) were obtained at 850 °C by using 25 MPa prepressing and 75% (mass fraction) glucose process.
- Publication
Journal of East China University of Science & Technology, 2023, Vol 49, Issue 5, p647
- ISSN
1006-3080
- Publication type
Article
- DOI
10.14135/j.cnki.1006-3080.20220517002