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Neck formation in reactive sintering: A model 2-D experiment

Published online by Cambridge University Press:  13 March 2012

Sukanya Murali  and
Dunbar P. Birnie III
Sukanya Murali
Affiliation:
Department of Materials Science and Engineering, Rutgers, The State University of New Jersey, Piscataway, New Jersey 08854-8065
Dunbar P. Birnie III*
Affiliation:
Department of Materials Science and Engineering, Rutgers, The State University of New Jersey, Piscataway, New Jersey 08854-8065
*
a)Address all correspondence to this author. e-mail: [email protected]
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Abstract

Silica-titania sub-close-packed single layers were deposited by spin coating titanium alkoxide sols containing inert 0.5 micrometer silica particles to study the process of reactive sintering more closely than has been done before. The sub-close-packed single layers were designed to achieve a coating density such that pairs or chains of silica particles were placed on the flat substrate and held together by the reactive titania thin films overlaid on the surface and in the neck regions of these essentially 2-D particle networks. Because of the low density of silica particles, all of the two-particle junctions and neck regions were aligned for geometrically direct viewing; as a result scanning electron microscopy was useful for observing the morphology of these neck regions. Image analysis was used to quantify the neck diameter for varying titania/silica precursor concentration ratios. Geometrical calculations that relate the change in neck volume to the neck radius are presented. Implications for design of reactive sintering systems are discussed.

Keywords

Silica-titaniaSiO2-TiO2interparticle neck formationsub-close-packed layersspin coatingliquid pendular bridgesintering
Type
Articles
Information
Journal of Materials Research , Volume 27 , Issue 8 , 28 April 2012 , pp. 1193 - 1197
Copyright
Copyright © Materials Research Society 2012

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