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The effect of porosity development on the removal of organic vehicle from ceramic or metal moldings

Published online by Cambridge University Press:  31 January 2011

S.A. Matar ,
M.J. Edirisinghe ,
J.R.G. Evans  and
E.H. Twizell
S.A. Matar
Affiliation:
Department of Mathematics and Statistics, Brunel University, Uxbridge, Middlesex UB8 3PH, United Kingdom
M.J. Edirisinghe
Affiliation:
Department of Materials Technology, Brunel University, Uxbridge, Middlesex UB8 3PH, United Kingdom
J.R.G. Evans
Affiliation:
Department of Materials Technology, Brunel University, Uxbridge, Middlesex UB8 3PH, United Kingdom
E.H. Twizell
Affiliation:
Department of Mathematics and Statistics, Brunel University, Uxbridge, Middlesex UB8 3PH, United Kingdom
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Abstract

An experimentally verified model, which quantifies the degradation and diffusion of organic vehicle during pyrolysis of a ceramic molding in the shape of an infinite cylinder, has been modified to accommodate the various effects of porosity development as degradation proceeds. Thus, in the first case, a shrinking radius has been taken into account as organic matter recedes. Secondly, the formation of uniformly distributed porosity is considered as organic vehicle is removed. In each of these instances, the model predicts the critical heating rate and temperature at which boiling occurs in the ceramic body, giving rise to internal defects for various cylinder radii.

Type
Articles
Information
Journal of Materials Research , Volume 8 , Issue 3 , March 1993 , pp. 617 - 625
Copyright
Copyright © Materials Research Society 1993

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