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Low Temperature Synthesis of Single-crystal alpha alumina Platelets by Calcining Bayerite and Potassium Sulfate

Journal of Materials Science & Technology 2011年第11期27卷 1011-1015页

作者： Xinghua Su Jiangong Li School of Materials Science and Engineering Changtan University Xi＇an 710061 China Institute of Materials Science and Engineering Lanzhou University Lanzhou 730000 China

Single-crystal alpha alumina （α-Al2O3） platelets were synthesized by calcining a powder mixture of bayerite （α-AI（OH）3） and potassium sulfate （K2SO4） at 900℃. The crystalline phase evolutions and morphologies of the samples were characterized by X-ray diffraction （XRD）, scanning electron microscopy （SEM）, and transmission electron microscopy （TEM）. The synthesized samples mainly consisted of single-crystal α-Al2O3 platelets with a diameter of 0.5-1.5 μm and a thickness of 50-150 nm. Moreover, with 3, 5, and 8 wt% （referred to the obtained alumina） α-Al2O3 seeds adding into the powder mixture of bayerite and potassium sulfate, the average diameter of α-Al2O3 platelets can be reduced to 450, 240, and 220 nm, respectively. It is found that the sequence of the phase transformation is the bayerite （α-Al（OH）3） → boehmite （γ-AIOOH） →γ-Al2O3 → α-Al2O3. Further analysis indicated that K2SO4 can promote the phase transformation from α-Al2O3 to α-Al2O3 and the formation of single-crystal α-Al2O3 platelets might be attributed to the liquid phase K3AI（SO4）3.

关键词： alpha alumina Platelets Phase transformation Calcination

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Nano-alumina based(alpha and gamma)drilling fluid system to stabilize high reactive shales

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Petroleum 2021年第2期7卷 142-151页

作者： Ali Hassanzadeh Afshar Alihosseini Majid Monajjemi Mahdi Nazari-Sarem Department of Chemical Engineering Central Tehran BranchIslamic Azad UniversityTehranIran

Most of water based drilling fluids easily penetrate into shale formations and cause serious problems such as well instability,destruction of the formation,wall pipe folding and pipe *** present research aims to assess the effects of alumina nano-particles(alpha and gamma)on shale/clay stability due to the unique specifications of alumina(alpha and gamma)nano *** SEM,XRD,EDAX and AFM analyses of recovered shale samples indicate that the average size of alpha alumina nano-particles coating the shale surface and the pores existing in the shale is between 25 and 35 nm,whereas the average size of gamma alumina nano-particles coating the shale surface and the pores present in the shale is between 20 and 30 *** addition,samples recovered by nano-alpha reveal more porosity remained in the shale sample in comparison with the nano-gamma ***,the results obtained from EDAX illustrate a suitable nano-gamma alumina over the recovered *** experiment with five types of drilling fluid without the presence of potassium chloride as an inhibitor salt ***,the water based drilling fluid containing nano-gamma alumina with less than 1%wt was chosen as the best ***,the presence of alumina nano-particles optimizes the stability of formations containing ions like shale.

关键词： Water base fluid nano-particle alpha alumina Gamma alumina Devices analyses

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