An investigation into the correlation between nano-impact resistance and erosion performance of EB-PVD thermal barrier coatings on thermal ageing |
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| Authors: | Jian Chen Ben D Beake Richard G Wellman John R Nicholls Hanshan Dong |
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| Affiliation: | 1. Jiangsu Key Laboratory of Advanced Metallic Materials, School of Materials Science and Engineering, Southeast University, Nanjing 211189, China;2. School of Metallurgy and Materials, University of Birmingham, Birmingham, B15 2TT, UK;3. Micro Materials, Willow House, Yale Business Village, Ellice Way, Wrexham, LL13 7YL, UK;4. School of Applied Sciences, Cranfield University, Bedford, MK43 0AL, UK |
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| Abstract: | Nanomechanical testing (nano-impact and nanoindentation mapping) has been carried out on the top surfaces of as-received and aged 8 wt.% yttria stabilised zirconia (YSZ) thermal barrier coatings (TBCs) produced by electron-beam physical vapour deposition (EB-PVD). The correlation between the nanomechanical test results and the previously reported erosion resistance of the TBCs has been investigated. The experimental results revealed that aged TBCs on zirconia for 24 h at 1500 °C or on alumina for 100 h at 1100 °C resulted in large increases in their hardness (H), modulus (E), H/E and H3/E2 ratios but their erosion resistance was reduced. Nano-impact tests showed a dramatic decrease in impact resistance following the ageing of these TBCs, which is consistent with the erosion results. The strong correlation between the nano-impact and erosion resistances has confirmed the premise that rapid laboratory impact tests must produce deformation with similar contact footprint to that produced in the erosion tests. |
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| Keywords: | Erosion Thermal barrier coatings Nano-impact Nanoindentation |
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