About this Abstract |
Meeting |
MS&T23: Materials Science & Technology
|
Symposium
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Engineering Ceramics: Microstructure-Property-Performance Relations and Applications
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Presentation Title |
Thermal Property and Corrosion Resistance of Xenotime-type Rare Earth Phosphates for Environmental Barrier Coatings |
Author(s) |
Bishnu Pada Majee, Keith Bryce, Jie Lian, Liping Huang |
On-Site Speaker (Planned) |
Bishnu Pada Majee |
Abstract Scope |
Xenotime-type rare earth phosphate (REPO4) have been experimentally studied as potential environmental barrier coatings (EBCs) for SiC-based ceramic-matrix composites (CMCs) due to their excellent stability at high temperature, suitable coefficients of thermal expansion (CTEs), low thermal conductivity and good resistance to calcium-magnesium aluminosilicate (CMAS) and water vapor corrosion. In this work, we have synthesized single component REPO4 (RE=Sc, Lu, Yb, Er & Y) via a chemical co-precipitation technique and consolidation by spark plasma sintering. The phase, microstructure and thermal transport properties are characterized via X-ray diffraction (XRD), Scanning Electron Microscope (SEM) and Dilatometry. Single-phase Xenotime-type rare earth phosphates display CTE values within the range of 4 to 7.5 × 10-6 /°C in the temperature range from 200 to 1300 °C, close to that of SiC-based CMCs substrate (~4.5 ×10−6 /°C). Their corrosion resistance were evaluated against CMAS interaction at different temperatures and water vapor corrosion at 1500 °C. |