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Properties of a Submicron-Honeycomb thin film

Published online by Cambridge University Press:  16 February 2011

R. C. Furneaux ,
J. S. Crompton  and
D. J. Fitchett
R. C. Furneaux
Affiliation:
Alcan International Limited, Banbury, Oxon, England 0X16 7SP
J. S. Crompton
Affiliation:
Alcan International Limited, Banbury, Oxon, England 0X16 7SP
D. J. Fitchett
Affiliation:
Alcan International Limited, Banbury, Oxon, England 0X16 7SP
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Abstract

A method has been developed of separating the porous film produced by anodizing aluminium from its substrate. Such films have a honeycomb morphology with pores that open at both surfaces. They are composed of essentially anhydrous alumina doped with acid anion from the anodizing electrolyte, and are electron diffraction insensitive. A geometrical model has been developed that describes how the pore morphology is determined by the anodizing voltage. Using this model, expressions are derived that relate cell dimensions to voltage-determined parameters and bulk properties such as porosity.

The flexural modulus and tensile strength of honeycombs have been modelled by considering bending moments experienced by the cell walls. Thus, the properties were expressed in terms of cell dimensions. Here, the anodic film and honeycomb models are combined. These are used to analyze the mechanical properties of the films as determined by the anodizing parameters. A critical crack size is predicted and compared with the results of microstructural examinations. Good agreement is shown. Assumptions behind these findings and the implications arising are discussed.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 188: Symposium K – Thin Films: Stresses and Mechanical Properties II , 1990 , 281
Copyright
Copyright © Materials Research Society 1990

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References

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