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Nanoindentation of particulate coatings

Published online by Cambridge University Press:  31 January 2011

M. J. Adams ,
A. Akram ,
B. J. Briscoe ,
C J. Lawrence  and
D. Parsonage
M. J. Adams
Affiliation:
Particle Technology Group, Department of Chemical Engineering and Chemical Technology, Imperial College of Science, Technology and Medicine, London SW7 2BY, United Kingdom
A. Akram
Affiliation:
Particle Technology Group, Department of Chemical Engineering and Chemical Technology, Imperial College of Science, Technology and Medicine, London SW7 2BY, United Kingdom
B. J. Briscoe*
Affiliation:
Particle Technology Group, Department of Chemical Engineering and Chemical Technology, Imperial College of Science, Technology and Medicine, London SW7 2BY, United Kingdom
C J. Lawrence
Affiliation:
Particle Technology Group, Department of Chemical Engineering and Chemical Technology, Imperial College of Science, Technology and Medicine, London SW7 2BY, United Kingdom
D. Parsonage
Affiliation:
Particle Technology Group, Department of Chemical Engineering and Chemical Technology, Imperial College of Science, Technology and Medicine, London SW7 2BY, United Kingdom
*
a)Address all correspondence to this author. e-mail: [email protected]
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Abstract

A knowledge of the formation and rupture mechanisms for agglomerates is essential when seeking to model equipment designed to produce and process such materials. In the work described here, nanoindentation of “two-dimensional” agglomerate films, basically particulate coatings, was carried out to establish a means of identifying the generic breakage mechanisms for agglomerates. Selected applied load and penetration depth data in the range (0.02 mN and 700 nm, respectively) are provided as a function of the loading time during continuous loading for a model system composed rather of monodispersed colloidal silica particles (20–24 nm diameter) bound with a poly(methyl methacrylate) at 5 vol%. It is argued that these data enable the sequence of binder bridge failures to be observed, thus giving an indication of the breakage mechanism of the agglomerate and also the strength of the individual junctions. These data are also incorporated into a mechanical model that describes the rupture and deformation behavior of these planar agglomerate systems.

Type
Articles
Information
Journal of Materials Research , Volume 14 , Issue 6 , June 1999 , pp. 2344 - 2350
Copyright
Copyright © Materials Research Society 1999

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References

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