UNSPECIFIED. (1999) A process for the production of sub-micron to millimetre sized thermally stable alpha-alumina spheres. MATERIALS SCIENCE AND ENGINEERING B-SOLID STATE MATERIALS FOR ADVANCED TECHNOLOGY, 60 (3). pp. 217-222. ISSN 0921-5107

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Abstract

The sol-emulsion-gel method has been employed to produce alumina gel spheres from unseeded as well as seeded alumina sol. Controlled heating of the unseeded gel spheres leads to the formation of alpha-alumina phase at 1200 degrees C. Various seeds have been tried to determine the effect of seeding on the formation of alpha-alumina and it is found that seeding with 0.5 wt.% Fe2O3 leads to the formation of alpha-alumina at a relatively low temperature of 950 degrees C. The sizes of the microspheres can be varied in the range between 0.5 mu m and 1 mm by suitable choice of the process parameters. The resultant gel spheres on controlled heating transform into thermally stable alpha-alumina spheres. (C) 1999 Elsevier Science S.A. All rights reserved.

Item Type:	Journal Article
Subjects:	T Technology > TA Engineering (General). Civil engineering (General) Q Science > QC Physics
Journal or Publication Title:	MATERIALS SCIENCE AND ENGINEERING B-SOLID STATE MATERIALS FOR ADVANCED TECHNOLOGY
Publisher:	ELSEVIER SCIENCE SA
ISSN:	0921-5107
Date:	29 June 1999
Volume:	60
Number:	3
Number of Pages:	6
Page Range:	pp. 217-222
Publication Status:	Published
URI:	http://wrap.warwick.ac.uk/id/eprint/14372

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