Characterisation of the microstructure and thermal properties of Nd2Zr2O7 and Nd2Zr2O7/YSZ thermal barrier coatings |
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| Authors: | G. Moskal L. Swadźba M. Hetmańczyk B. Witala B. Mendala J. Mendala P. Sosnowy |
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| Affiliation: | 1. Silesian University of Technology, Department of Materials Science, 40-019 Katowice, Slaskie, Poland;2. Silesian University of Technology, Department of Materials Technology, 40-019 Katowice, Slaskie, Poland;3. Factory of Transport Equipment WSK “PZL – Rzeszów” Stock Company, Poland;1. State Key Laboratory of Superhard Materials, Jilin University, Changchun 130012, China;2. Center for High Pressure Science and Technology Advanced Research, Shanghai 201203, China;1. Faculty of Materials Science and Engineering, Kunming University of Science and Technology, Kunming 650093, People’s Republic of China;2. State Key Laboratory of New Ceramics and Fine Processing, Department of Materials Science and Engineering, Tsinghua University, Beijing, 100084, People’s Republic of China;3. School of Engineering and Applied Science, Harvard University, Cambridge, MA 02138, USA;4. Department of Physics and Engineering Physics, School of Science and Engineering, Tulane University, New Orleans, LA 70118, USA |
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| Abstract: | The microstructure of following thermal barrier coatings (TBC) was characterised in this paper: monolayer coatings Nd2Zr2O7 and 8YSZ; a double ceramic layered (DCL) coating. Coatings were characterised by thicknesses that did not exceed 300 μm and porosities of approx. 5%. The chemical and phase composition analysis of the DCL layers revealed an external Nd2Zr2O7 ceramic layer approx. 80 μm thick, a transitional zone approx. 120 μm thick and an internal 8YSZ layer 100 μm thick. For the case of the monolayer coating, the Nd2Zr2O7 pyrochlore phase was the only one-phase component. The surface topography of both TBC systems was typical for plasma sprayed coatings, and compressive stress state had a value of approx. 5–10 MPa. Measurements of the thermal parameters, i.e., thermal diffusivity, point to considerably better insulative properties for both new types of layers when compared to the standard 8YSZ layers. |
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