Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
5464874 | Surface and Coatings Technology | 2016 | 9 Pages |
Abstract
In this work the thermal conductivity of spark plasma sintering (SPS) produced yttria-stabilised zirconia (YSZ) model thermal barrier coatings containing 10 or 20 vol.% of MoSi2 healing particles was investigated using the laser flash method. Measurements were performed on free-standing composite material over a temperature range from room temperature up to 1000 °C. Microstructural analysis was carried out by SEM combined with image analysis to determine the size, distribution and area fraction of healing particles. The measurements were compared with the results from microstructure-based multi-physics finite element (FE) models and analytical models (the asymmetric Bruggeman model and the Nielsen model) in order to study the effects of the addition of MoSi2 particles as well as the presence of micro-pores on the apparent thermal conductivity. The results show a strongly non-linear increase in the thermal conductivity of the composite material with the MoSi2 volume fraction and a dependence on the aspect ratio of MoSi2 particles. Interparticle connectivity is shown to play a big role too.
Related Topics
Physical Sciences and Engineering
Materials Science
Nanotechnology
Authors
Justyna Kulczyk-Malecka, Xun Zhang, James Carr, Alexandra L. Carabat, Willem G. Sloof, Sybrand van der Zwaag, Federico Cernuschi, Franck Nozahic, Daniel Monceau, Claude Estournès, Philip J. Withers, Ping Xiao,