Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
10620992 | Acta Materialia | 2006 | 10 Pages |
Abstract
A mathematical model is developed for the progressive sintering of ceramic columns in a thermal barrier coating made using the electron beam-physical vapour deposition route. The model assumes that inter-columnar sintering is driven by changes in the interface energy and elastic stored energy of the columns. The analysis reveals the sensitivity of the sintering rate to the in-plane elastic modulus as well as to an imposed thermal mismatch strain, interfacial energies and diffusivities. It is shown that mud-cracking of the coating leads to a drop in in-plane stress within the coating and thereby to accelerated sintering. Explicit calculations are reported for the evolution of sintering within an array of mud-cracked columns, and for the density of mud cracks.
Related Topics
Physical Sciences and Engineering
Materials Science
Ceramics and Composites
Authors
R.G. Hutchinson, N.A. Fleck, A.C.F. Cocks,