四甲基氢氧化铵
材料科学
化学工程
煅烧
晶体生长
研磨
粒径
氢氧化物
Crystal(编程语言)
超声
反应速率
超纯水
催化作用
纳米技术
化学
结晶学
冶金
有机化学
程序设计语言
工程类
计算机科学
作者
Wenqi Tang,Jin Zhu,Hao Sun,Shusheng Lu,Guangmin Hu,Chaopeng Fu,Jiao Zhang
标识
DOI:10.1016/j.jallcom.2023.171500
摘要
Spherical alumina with a purity greater than 99.999% is sintered by the precursor obtained from the reaction of high-purity aluminum with ultrapure water, which is of great interest for grinding in semiconductor processing and other fields. In this study, tetramethylammonium hydroxide is introduced to the aluminum-water (Al-H2O) reaction, and the crystal growth of the HPA precursor is adjusted by ultrasonication. The ultrasound can break the gas barrier film at the early stage of the reaction, then increase the reaction potential energy on the aluminum surface, accelerate the reaction rate, and inhibit the preferential growth of Al(OH)3 crystals along (110), (111), (131), and (202) faces. It increases the dissociation rate of crystals in the corresponding crystal faces and promotes the formation of the Al-O bond in Al(OH)3 and Al2O3 to obtain fine HPA precursors with uniform size distribution. Then, the ultrafine and sphere-like α-Al2O3 powders with a particle size D50 of 370 nm are prepared after calcination at 1250 °C.
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