Effect of fluoride additives on production and characterization of nano-�?-Al2O3 particles

Bulletin of materials science

F Mirjalili¹ 

[1] Department of Material Engineering, Maybod Branch, Islamic Azad University, Maybod 89156â€�??75164, Iran$$Department of Material Engineering, Maybod Branch, Islamic Azad University, Maybod 89156â€�??75164, IranDepartment of Material Engineering, Maybod Branch, Islamic Azad University, Maybod 89156â€�??75164, Iran$$

关键词: ð›�?-Al2O3;    X-ray diffraction;    scanning electron microscopy.;   

DOI  :  

学科分类：材料工程

来源: Indian Academy of Sciences

【 摘 要 】

Nano-ð›�?-Al₂O₃ particles were synthesized by a solâ€�?�gel method using aqueous solutions of aluminum isopropoxide and 0.5 Maluminum nitrate. Sodium dodecylbenzenesulfonate (SDBS) was used as surfactant stabilizing agents. The solution was stirred for 48 h at 60 °C. The microstructural observation showed that surfactant with 48 h stirring time nanoscale ð›�?-Al₂O₃ powder was produced at 1200 °C in the range of 20â€�??30 nm in the presence of SDBS as a surfactant with 48 h stirring time. Temperature reduction of ð›�?-Al₂O₃ formation has been achieved by introducing fluoride in the alumina precursor. The effects of ZnF₂ additive and milling on the phase transformation as well as micrograph of the prepared ð›�?-Al₂O₃ particles were investigated. The samples were characterized by different techniques such as X-ray diffraction, thermogravimetry analysis, differential scanning calorimetry, Fourier transform infrared spectra, scanning electron microscopy and transmission electron microscopy. Results indicated that using zinc fluoride (ZnF₂) additive accompanied by milling led to retardation of the transformation temperature and modification of the alumina particle shape. The finest size for nonagglomerated nano-plate-like ð›�?-Al₂O₃ particles (15â€�??20 nm) was achieved at 950 °C.

【 授权许可】

Unknown