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

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.

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Centrifugal Compaction of Submicron High Purity Alumina Powder.

Journal of the Japan Society of Powder and Powder Metallurgy ◽

10.2497/jjspm.39.39 ◽

1992 ◽

Vol 39 (1) ◽

pp. 39-43 ◽

Cited By ~ 7

Author(s):

Shunzo Tashima ◽

Masayuki Sumita ◽

Hidenori Kuroki

Keyword(s):

High Purity ◽

Alumina Powder

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

Journal of the Ceramic Society of Japan ◽

10.2109/jcersj.114.415 ◽

2006 ◽

Vol 114 (1329) ◽

pp. 415-417 ◽

Cited By ~ 3

Author(s):

Takashi SHIRAI ◽

Chanel ISHIZAKI ◽

Kozo ISHIZAKI

Keyword(s):

High Purity ◽

Alumina Powder ◽

Aluminum Ions

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Determination of trace elements in high purity alumina powder by helium enhanced direct current glow discharge mass spectrometry

Spectrochimica Acta Part B Atomic Spectroscopy ◽

10.1016/j.sab.2016.05.003 ◽

2016 ◽

Vol 122 ◽

pp. 46-51 ◽

Cited By ~ 8

Author(s):

Sehoon Jung ◽

Sunhye Kim ◽

Joachim Hinrichs

Keyword(s):

Mass Spectrometry ◽

Trace Elements ◽

Glow Discharge ◽

Direct Current ◽

High Purity ◽

Glow Discharge Mass Spectrometry ◽

Alumina Powder

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Influence of the Dispersant on the Bead Milling of Alumina

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.512-515.36 ◽

2012 ◽

Vol 512-515 ◽

pp. 36-39

Author(s):

Ling Yuan ◽

Long Hao Qi ◽

Wei Pan

Keyword(s):

Citric Acid ◽

Relative Density ◽

Milling Time ◽

Alumina Powder ◽

Bead Milling ◽

Different Types ◽

Alpha Alumina

The high-pure alpha-alumina powders with some agglomerate were treated by bead milling and their sintering behaviors were studied in this paper. During the treatment, the effect of different types and different amounts of dispersants was also investigated. It was shown that optimum dispersant content was 0.5% citric acid and optimum milling time is 6 hours. The sintering property of alumina powder after bead milling was significantly improved. Their relative density after sintering at 1500 degrees can reach 99.3% while the raw powders’ can only reach 90% at same condition.

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

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.399-401.673 ◽

2011 ◽

Vol 399-401 ◽

pp. 673-676 ◽

Cited By ~ 1

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.

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