文献类型：期刊文献

英文题名：Effect of process factors on properties of high dispersion spherical α-Al2O3 particles prepared by hydrothermal method

作者：Xiang, Hairu[1]; Wang, Zhiyuan[1]; Yin, Qiao[1]; Wang, Lei[1]; Zhang, Liwei[2]; Wang, Hailong[1]; Xu, Hongliang[1]; Zhang, Rui[1,3]; Lu, Hongxia[1]

第一作者：Xiang, Hairu

通讯作者：Lu, Hongxia

机构：[1] School of Materials Science and Engineering, Zhengzhou University, No. 100 of Science Road, Zhengzhou, Henan Province, 450001, China; [2] Xinxiang University, Xinxiang, 453003, China; [3] Zhengzhou University of Aeronautics, Zhengzhou, 450015, China

第一机构：School of Materials Science and Engineering, Zhengzhou University, No. 100 of Science Road, Zhengzhou, Henan Province, 450001, China

年份：2019

卷号：45

期号：17

起止页码：22007-22014

外文期刊名：Ceramics International

收录：EI(收录号：20193007234878);Scopus(收录号：2-s2.0-85069750755)

基金：This work is supported by the National Natural Science Foundation of China numbered by 51772275 and the sponsor of the Science and Technical Development Program of Henan Province ( 142300410099 , 172102210008 ).

语种：英文

外文关键词：Alumina - Aluminum hydroxide - Aluminum oxide - Aluminum sulfate - Calcination - Grain size and shape - Nanocrystalline materials - Particle size - Spheres

摘要：Spherical α-Al2O3 powders were synthesized from a mixed solution consisting of Al2(SO4)3·18H2O, Al(NO3)3·9H2O and CH4N2O by hydrothermal method with muffle calcination and microwave calcination. Effects of raw material ratio, reaction temperature, and filling factor on properties of products were investigated. Properties of thermal behavior, functional groups, phase composition, microstructure and specific surface of precursors and products were characterized by DSC-TG, FT-IR, XRD, SEM and BET, respectively. Results show that SO42? plays an important role in the sphere formation of precursors and particle size can be changed by adding different proportion of NO3?. Precursors are amorphous spherical hydrated alumina containing SO42?, and the conversion of crystalline phase is from amorphous to γ-phase and then to α-phase at 1100 °C. Spherical morphology can be retained after crystallization to α-Al2O3. Compared with muffle furnace, Microwave calcination can increase calcining rate by three times and reduce insulation time by three quarters. When hydrothermal reaction temperature is 120 °C, the particles can be precipitated with good sphericity and narrow grain size distribution. If hydrothermal reaction temperature is too high or too low, spherical morphology can't be obtained. Size of the particles can be regulated by the different raw material ratio and filling factor from 800 nm to 3 μm, and specific surface area is in the range of 8 m2/g~15 m2/g. ? 2019 Elsevier Ltd and Techna Group S.r.l.