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The sintering behavior of ultrafine alumina particles

Published online by Cambridge University Press:  31 January 2011

John E. Bonevich  and
Laurence D. Marks
John E. Bonevich*
Affiliation:
Department of Materials Science and Engineering, Northwestern University, 2145 Sheridan Road, Evanston, Illinois 60208
Laurence D. Marks
Affiliation:
Department of Materials Science and Engineering, Northwestern University, 2145 Sheridan Road, Evanston, Illinois 60208
*
a)Present address: Hitachi Advanced Research Laboratory, Hatoyama, Saitama 350-03, Japan.
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Abstract

Ultrafine particles (UFPs) of aluminum oxide were prepared by an arc discharge, sintered in a custom-built ultrahigh vacuum (UHV) furnace system, and characterized in a high resolution electron microscope (HREM) operating under UHV conditions. The UFPs produced range in size from 20 to 50 nm and have highly faceted surfaces. The atomic structure of the UFPs corresponds to the cubic (γ) and orthorhombic (δ) variants of the spinel structure. Sintering in these UFPs demonstrates three major issues. Surface faceting plays a major role in determining the final sintering geometry with sintering occurring predominantly on the close-packed {111} facets. Surface diffusion is the predominant mechanism for sintering, as evidenced by the fact that many sintered particles have their initial adhesion structure ‘locked-in’ during sintering with no reorientation occurring. Furthermore, the necks formed during sintering have well-defined, atomically sharp contact angles which suggests that the neck growth process is controlled by the faceted structures and may be modeled by a mechanism similar to crystal growth due to ledges, grain boundaries, and twins. The driving force for sintering can be considered as a chemical potential difference between facet surfaces and the neck region.

Type
Articles
Information
Journal of Materials Research , Volume 7 , Issue 6 , June 1992 , pp. 1489 - 1500
Copyright
Copyright © Materials Research Society 1992

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