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Computer simulations of interactions between ultrafine alumina particles produced by an arc discharge

Published online by Cambridge University Press:  31 January 2011

M. H. Teng ,
L. D. Marks  and
D. L. Johnson
M. H. Teng
Affiliation:
Department of Materials Science and Engineering, Northwestern University, 2225 N. Campus Dr., Evanston, Illinois 60208
L. D. Marks
Affiliation:
Department of Materials Science and Engineering, Northwestern University, 2225 N. Campus Dr., Evanston, Illinois 60208
D. L. Johnson
Affiliation:
Department of Materials Science and Engineering, Northwestern University, 2225 N. Campus Dr., Evanston, Illinois 60208
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Abstract

We wrote two computer programs, 3D and BUMP, to interpret transmission electron microscope (TEM) micrographs made during a study of the initial stage sintering of ultrafine alumina particles (UFP's, 20–50 nm in diameter). The first simulated the 3D geometric relationships of particles, from which we concluded that surface diffusion was the predominant sintering mechanism because no shrinkage occurred. BUMP simulated random contact of two particles and showed that the particle chains that formed before sintering were not formed purely by chance. Instead the particles experienced a rearrangement process (rotation and sliding) which reduced the total surface energy.

Type
Articles
Information
Journal of Materials Research , Volume 12 , Issue 1 , January 1997 , pp. 235 - 243
Copyright
Copyright © Materials Research Society 1997

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