About this Abstract |
| Meeting |
MS&T26: Materials Science & Technology
|
| Symposium
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Lightweight Composites, Materials, and Alloys
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| Presentation Title |
High-Entropy Ti-Based Ceramic Coatings and Composites for Extreme Environments
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| Author(s) |
Ramasis Goswami, James A Wollmershauser |
| On-Site Speaker (Planned) |
Ramasis Goswami |
| Abstract Scope |
Graphite is a popular choice for high-temperature applications due to its low cost, lightweight, and ease of forming. However, it is susceptible to oxidation at temperatures above 500°C and can be eroded by chemical and mechanical forces. To overcome these limitations, protective coatings are applied. High-entropy carbides are particularly promising for this purpose, offering a unique combination of high hardness, excellent oxidation resistance, and superior thermal stability. We demonstrate the growth of an ultra-high temperature, high-entropy Zr-Hf-V-Nb-Ti-C ceramic layer on graphite by transforming a blend of metallic powders via the application of hydrostatic pressure. The carbide nucleated on the graphite surface and grew in a faceted manner. The interface is not abrupt; the presence of fine crystallites and the gaps between them during growth minimize the effects of coefficient of thermal expansion mismatch. Here, we present the microstructures and mechanical properties of these Ti-based composites and coatings. |