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| Abstract No.: |
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Scheduled at:
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Wednesday, September 28, 2011, Saal A 4:25 PM
Aviation Industry 3
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| Title: |
Structural and mechanical properties analysis of Si/Mullite/BSAS environmental barrier coatings exposed to thermal cycling in water vapour environment
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| Authors: |
Cristian Victor Cojocaru* / National Research Council Canada / Industrial Materials Institute, Canada
Christian Moreau / National Research Council of Canada (NRC), Industrial Materials Institute (IMI), Canada
Rogerio Soares Lima/ National Research Council of Canada (NRC), Industrial Materials Institute (IMI), Canada
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| Abstract: |
The ongoing development of environmental barrier coatings (EBCs) offers the prospect to implement the full potential of silicon-based ceramics for high temperature structural applications (e.g., advanced gas turbine engines and structural components of future
hypersonic vehicles). The current state-of-the-art EBC system comprises a Si bond coat, a mullite (3Al2O3"2SiO2) interlayer and a (1-x)BaO"xSrO"Al2O3"2SiO2, 0 d x d 1 (BSAS) crack-resistant and water vapour attack resistant top coat. In this study, the influence of water vapour corrosion on the structural and mechanical properties of plasma-sprayed Si/Mullite/BSAS architectures was assessed by furnace thermal cycle testing (e.g. 100 cycles, 2h/cycle at 1300oC). Commercially available mullite and BSAS powders were used to produce crystalline coatings by air plasma spraying. Fully crystalline mullite and celsian BSAS coatings were engineered under controlled conditions on silicon coated sintered ±-SiC Hexoloy and SiC ceramic matrix composites (CMCs) substrates. The overall performance at high-temperature of these functionally graded EBCs is discussed and correlated to their microstructural characteristics.
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