About this Abstract |
Meeting |
2021 TMS Annual Meeting & Exhibition
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Symposium
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Materials for High Temperature Applications: Next Generation Superalloys and Beyond
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Presentation Title |
Oxidation-resistant, Thermally-cyclable, Robust Oxide/Metal Composite Materials for Concentrated Solar Power |
Author(s) |
Camilla McCormack, Mario Raul Caccia, Thuan Dinh Nguyen, Gregory Scofield, Grigorios Itskos, Michael D. Sangid, Kenneth H. Sandhage |
On-Site Speaker (Planned) |
Camilla McCormack |
Abstract Scope |
The production of electricity in a concentrated solar power (CSP) plant involves the use of heat, generated from concentrated sunlight, to expand a high-pressure working fluid so as to drive a turbine. A key step for a reduction in the cost of CSP-derived electricity would be to increase the temperature of the working fluid entering into the turbine to >750oC. Unfortunately, compact heat exchangers (HEXs) used to efficiently transfer heat to the high-pressure working fluid have been limited to temperatures <550oC, owing to a dramatic reduction in the mechanical behavior of conventional metal alloys (such as stainless steels) at significantly higher temperatures at high pressures. Ceramic/metal composites (cermets) can provide a highly-attractive combination of high-temperature properties for such compact heat exchangers. In this talk, the use of Al2O3/Cr cermets as alternative HEX materials will be discussed. Al2O3/Cr cermets are stiff, possess relatively high failure strengths, and are thermally cyclable (owing to similar thermal expansions of Al2O3 and Cr). The high-temperature oxidation resistance of Al2O3/Cr cermets will also be demonstrated in flowing CO2(g) and in synthetic air. |
Proceedings Inclusion? |
Planned: |