Sintering of Spinel (MgAl<SUB>2</SUB>O<SUB>4</SUB>) Prepared by Alkoxy-Method
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概要
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The sintered density, and the initial sintering and grain growth kinetics of spine (MgAl<SUB>2</SUB>O<SUB>4</SUB>) derived from alkoxide were investigated by means of dilatometry, X-ray diffraction, electron microscopy and the measurement of isothermal shrinkage. The obtained results are summarized as follows:<BR>(1) Spinet powders calcined between 600 and 1000°C consisted of aggregates of small particles, and particle growth was observed at 1200°C.<BR>(2) The crystallite size of spinel increased markedly at temperatures above 1200°C.<BR>(3) The highest sintered density was obtained for the powder calcined at 800°C for 2 h. Under these calcining conditions, the spinel compact exceeding 95% of theoretical density was obtained by sintering at 1600°C for 4 h in air.<BR>(4) The initial sintering kinetics of spinet was determined from 1100 to 1300°C. The sintering process was governed by the volume diffusion of oxygen ions which was represented by D=22.9 exp (-119, 000/RT) cm<SUP>2</SUP>/sec.<BR>(5) The grain growth of spinel was represented by the expression of G<SUP>2</SUP>-G<SUB>0</SUB><SUP>2</SUP>=kt, and the temperature dependence of k was given by k=12.7 exp (-116, 000/RT) cm<SUP>2</SUP>/sec.
- 社団法人 粉体粉末冶金協会の論文
著者
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Yamaguchi Osamu
Department of Cardiovascular Medicine, Osaka University Graduate School of Medicine
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SHIMIZU Kiyoshi
Department of Section of Neurophysiology of the Department of Clinical Laboratory, Osaka Neurologica
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Shimizu Kiyoshi
Department Of Anatomy Tokyo Medical College
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Kaji Akiyasu
Deparment of Applied Chemistry, Faculty of Engineering, Doshisha University
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Takeoka Kiyoshi
Deparment of Applied Chemistry, Faculty of Engineering, Doshisha University
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Yamaguchi Osamu
Department Of Agricultural Sciences Faculty Of Agriculture Okayama University
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Shimizu Kiyoshi
Deparment of Applied Chemistry, Faculty of Engineering, Doshisha University
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Yamaguchi Osamu
Deparment of Applied Chemistry, Faculty of Engineering, Doshisha University
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