Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
5465438 | Surface and Coatings Technology | 2017 | 11 Pages |
Abstract
The study analyses the thermophysical properties of yttria and yttria- with ceria- stabilized zirconia coatings, i.e. YSZ and YCeSZ, respectively. The spray processes were realized with the use of three different plasma spray torches: (i) SG-100; (ii) Axial III and (iii) hybrid WSP one. The deposition parameters were designed for each plasma torch separately. The microstructure of coatings was then analyzed using Optical and Scanning Electron Microscopy i.e. OM and SEM, respectively. The thermophysical properties of the coatings such as density, specific heat and thermal dilatation were measured using gas pycnometry, calorimetry and dilatometry methods respectively. The collected data were used, together with thermal diffusivity found with the use of laser flash method, to calculate the thermal conductivity of the deposits. The thermal conductivities of coatings were in a range from 0.63 to 0.99 [W/m·K] for YSZ samples and between 0.82 and 1.37 [W/m·K] in the case of YCeSZ coatings. Thermal transport properties were found to be influenced by the coatings' porosity and their microstructure. Finally, the thermal conductivity values were successfully validated using response function method, which can be an alternative to complex FEM methods.
Keywords
Related Topics
Physical Sciences and Engineering
Materials Science
Nanotechnology
Authors
PaweÅ SokoÅowski, Stefan Björklund, Radek Musalek, Rolando T. Jr, Lech PawÅowski, Benoit Nait-Ali, David Smith,