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| Abstract No.: |
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Scheduled at:
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Thursday, June 08, 2017, Hall 12 3:00 PM
Aviation & Power Generation Industry III
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| Title: |
The influence of sintering on the microstructure and mechanical properties of suspension plasma sprayed YSZ thermal barrier coatings
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| Authors: |
Dapeng Zhou* / Forschungszentrum Jülich GmbH, Germany
Jürgen Malzbender/ Forschungszentrum Jülich GmbH, Institute of Energy and Climate Research, Microstructure and Properties of Materials (IEK-2), Germany
Robert Vaßen/ Forschungszentrum Jülich GmbH, Institute of Energy and Climate Research, Materials Synthesis and Processing (IEK-1), Germany
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| Abstract: |
In this study, 5 mol% yttria stabilized zirconia (YSZ) coatings with different microstructures and porosity levels were deposited by axial suspension plasma spraying (SPS). Ni-base super alloy (IN 738) and vacuum plasma sprayed MCrAlY coating were used as substrate and bond coat, respectively. After spraying, the samples were isothermally annealed at 1100 °C for 1h, 3h, 10h and 50h. Porosity and mechanical properties (i.e., hardness, elastic modulus and indentation fracture toughness) of the ceramic coatings were measured before and after annealing. The porosity of the coatings was characterized with image analysis and mercury porosimetry. Hardness and elastic modulus were examined via instrumented depth-sensing micro-indentation. The indentation fracture toughness of the coatings after different annealing time was measured with the aid of a Vickers indentation fracture toughness test. It turned out that all SPS ceramic coatings revealed significant sintering effects during annealing leading to increased hardness, elastic modulus and decreased fracture toughness.
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