About this Abstract |
Meeting |
2021 TMS Annual Meeting & Exhibition
|
Symposium
|
Materials for High Temperature Applications: Next Generation Superalloys and Beyond
|
Presentation Title |
High-temperature, Thermally-cyclable, Reaction-formed, Co-continuous Refractory Metal/Ceramic Composites for Extreme Environments |
Author(s) |
Kenneth H. Sandhage, Yujie Wang, Priyatham Tumurugoti, Camilla K. McCormack, Alex R. Strayer, Adam S. Caldwell, Gregory D. Scofield, Zhenhui Chen, Raheleh Rahimi, Thuan Nguyen, Saeed Bagherzadeh, Kevin P. Trumble, Michael D. Sangid, Grigorios Itskos, Mario Caccia |
On-Site Speaker (Planned) |
Kenneth H. Sandhage |
Abstract Scope |
Ultra-high-melting, co-continuous, refractory metal/ceramic composites can provide unique and attractive properties for use in extreme environments. In this talk, the processing, microstructure, and properties of reaction-formed ZrC/W (Tsolidus = 2800oC) and related refractory-metal-bearing composites will be discussed. An interconnected W phase in ZrC/W composites provides enhanced thermal conductivity and toughness at high temperatures (relative to monolithic ZrC), whereas interconnected ZrC enhances the stiffness and resistance to erosion and creep (relative to monolithic W). The similar thermal expansion of both phases also provides excellent resistance to thermal shock/cycling. ZrC/W composites have been produced in complex, near-net shapes via reactive melt infiltration of readily-formed porous WC bodies. Exposure of such shaped porous bodies to a Zr-bearing liquid results in pressureless melt infiltration and reactive conversion into fully-dense ZrC/W bodies with <1% changes in external dimensions. The application of ZrC/W and other refractory-metal-bearing composites for aerospace and renewable energy production will be discussed. |
Proceedings Inclusion? |
Planned: |