| Title |
Thermophysical properties of YSZ and YCeSZ suspension plasma sprayed coatings having different microstructures |
|
Authors |
Pawe脙聟脗聜 Soko脙聟脗聜owski, Stefan Bj脙聝脗露rklund, Radek Musalek, Rolando T. Candidato,Jr., Lech Paw脙聟脗聜owski, Benoit Nait-Ali, David Smith |
|
Publication date |
2017/02/21 |
|
Journal |
Surface & Coatings Technology |
| Volume |
Volume 318 |
| Pages |
11 |
| Publisher |
Elsevier |
| Abstract |
The paper describes the ceramic top coats of Thermal Barrier Coatings (TBC) obtained by Suspension Plasma
Spraying (SPS). The spray process realized with different plasma torches allowed obtaining coatings having different
morphology, namely, columnar-like and two-zones microstructure. The microstructures influenced the
thermal transport properties of TBC's. 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.OMand 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 datawere used, togetherwith thermal diffusivity foundwith the use of laser flashmethod, 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脗路K] for YSZ samples and between 0.82 and 1.37 [W/m脗路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. |
| Index terms / Keywords |
Thermal Barrier Coatings (TBC) Suspension Plasma Spraying Thermal conductivity Specific heat Thermal dilatation Response function method |
| DOI |
|
Mindanao State
University - Iligan Institute of Technology