scholarly journals Tetrahedral Aluminum Ions on High Purity Sub-Micron α-Alumina Powder Surfaces

2006 ◽  
Vol 114 (1329) ◽  
pp. 415-417 ◽  
Author(s):  
Takashi SHIRAI ◽  
Chanel ISHIZAKI ◽  
Kozo ISHIZAKI
Keyword(s):  
High Purity ◽  
Alumina Powder ◽  
Aluminum Ions

Rheology of concentrated alumina suspension to improve the milling output in production of high purity alumina powder

1998 ◽  
Vol 133 (1-2) ◽  
pp. 41-47 ◽  
Author(s):  
R.M. Anklekar ◽  
S.A. Borkar ◽  
S. Bhattacharjee ◽  
C.H. Page ◽  
A.K. Chatterjee
Keyword(s):  
High Purity ◽  
Alumina Powder

Advances in High-Purity Alumina and Resource Distribution

2014 ◽  
Vol 926-930 ◽  
pp. 36-39
Author(s):  
Min Xian Du ◽  
Ke Liang Chen ◽  
Yong Gang Xiong
Keyword(s):  
Sustainable Development ◽  
High Purity ◽  
Low Cost ◽  
Resource Distribution ◽  
High Tech ◽  
Alumina Powder ◽  
Preparation Process ◽  
Excellent Performance ◽  
Preparation Methods

High-purity alumina has excellent performance and wide application in high-tech industries and areas of modern materials, so industrialized, low-cost, non-polluting and sustainable development preparation process has become one of the priorities of present high-purity alumina powder research. The use of high purity alumina and its major domestic craft preparation methods are described in the paper.

scholarly journals Centrifugal Compaction of Submicron High Purity Alumina Powder.

1992 ◽  
Vol 39 (1) ◽  
pp. 39-43 ◽  
Author(s):  
Shunzo Tashima ◽  
Masayuki Sumita ◽  
Hidenori Kuroki
Keyword(s):  
High Purity ◽  
Alumina Powder

scholarly journals Mechanism of Hard Agglomerate Formation in a High Purity Sub-micron .ALPHA.-Alumina Powder.

2001 ◽  
Vol 109 (1265) ◽  
pp. 16-22 ◽  
Author(s):  
Chanel ISHIZAKI ◽  
Purwadi RAHARJO ◽  
Kazunori SATO ◽  
Kozo ISHIZAKI
Keyword(s):  
High Purity ◽  
Alumina Powder ◽  
Hard Agglomerate ◽  
Alpha Alumina

Preparation of High-Purity α-Alumina by Oil-in-Water Microemulsion

2011 ◽  
Vol 399-401 ◽  
pp. 673-676 ◽  
Author(s):  
Jing Jing Ma ◽  
Bo Lin Wu
Keyword(s):  
High Purity ◽  
Average Crystallite Size ◽  
Microemulsion System ◽  
Alumina Powder ◽  
Mixed Solution ◽  
X Ray Diffraction ◽  
Step Size ◽  
Oil In Water ◽  
Diffraction Peaks ◽  
Mixed Oil

The main objective of this work was to prepare high purity α-alumina powder (α-Al2O3) by mixed oil-in-water microemulsion route. In this study α-alumina was prepared by quaternary microemulsion system (water/surfactant/co-surfactant/oil-phase). OP-10, alcohol and the mixed solution of cyclohexane and aluminium isopropoxide were used as surfactant, co-surfactant and oil-phase, respectively. After drying the amorphous precursor powder, α-alumina powder is obtained by sintering at 1200°C for 3-5h. The X-ray diffraction pattern shows the presence of alumina phase with crystal structure and the slow scan with step size 0.0170°/sec of selected diffraction peaks such as (113) has been recorded and calculated by Scherer’s formula. The average crystallite size is about 40nm.

scholarly journals Compaction and Sintering Behavior of a High Purity Alumina Powder Treated with Coupling Agents

1993 ◽  
Vol 101 (1173) ◽  
pp. 569-574
Author(s):  
Minoru TAKAHASHI ◽  
Yuichi MASUDA ◽  
Suguru SUZUKI
Keyword(s):  
High Purity ◽  
Coupling Agents ◽  
Sintering Behavior ◽  
Alumina Powder

scholarly journals Preparation of High-purity Alumina via Hydrolysis of Aluminum Isopropoxide after Desilication with Lanthanum Oxide

2021 ◽  
Vol 898 (1) ◽  
pp. 012022
Author(s):  
Qinnan Yin ◽  
Huixin Jin ◽  
Fuzhong Wu ◽  
Weijie Wang ◽  
Qian Yang
Keyword(s):  
Particle Size ◽  
High Purity ◽  
Silicon Content ◽  
Lanthanum Oxide ◽  
Ultrasonic Field ◽  
Alumina Powder ◽  
Aluminum Isopropoxide ◽  
Hydrolysis Method ◽  
Hydrolysis Temperature ◽  
Hydrolysis Conditions

Abstract High-purity alumina refers to ultra-fine alumina powder with a purity exceeding 99.99% and a uniform particle size. This material exhibits excellent corrosion resistance, high-temperature resistance, wear resistance, and oxidation resistance. Owing to the high silicon content of alumina prepared by means of the alcohol-aluminum hydrolysis method, the purity of the alumina is often unsatisfactory. Therefore, in this work, a new method for adding lanthanum oxide to isopropanol in the early aluminum isopropoxide synthesis stage is proposed. When lanthanum oxide was added, the silicon content of the precursor aluminum isopropoxide decreased to 0.0051%.Remove calcium, sodium, magnesium and other impurities by cleaning with hydrochloric acid under an ultrasonic field. The optimal hydrolysis conditions were determined as follows: hydrolysis temperature: 55, hydrolysate concentration: 80%, water to alkoxide ratio: 6:1. The alumina precursor calcined at 1200 yielded a high-purity alumina with a purity level of more than 99.99%, and the particle size reaches 2.037 μm.

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