| About this Abstract |
| Meeting |
MS&T21: Materials Science & Technology
|
| Symposium
|
Additive Manufacturing: Mechanisms and Mitigation of Aqueous Corrosion and High-temperature Oxidation
|
| Presentation Title |
High Temperature Oxidation Behavior of Additively Manufactured ZrB2-30vol%SiC in CO2 |
| Author(s) |
Marharyta Lakusta, Nicholas M. Timme, William Fahrenholtz, Jeremy Watts, Gregory Hilmas, David W. Lipke |
| On-Site Speaker (Planned) |
Marharyta Lakusta |
| Abstract Scope |
ZrB2-30vol%SiC-based ceramics are attractive candidates for heat exchangers operating with supercritical CO2 working fluids at temperatures up to 1100oC and pressures up to 250 bar owing to their flexural strength up to 700 MPa and thermal conductivity exceeding 65 W/m·K at 1100°C in air. Due to long-term heat exchanger applications, material compatibility with the working fluid is of significant technological importance. There is no information about ZrB2-30vol%SiC oxidation in CO2. The main goal of this work is to compare the high-temperature oxidation behavior of ZrB2-30vol%SiC in CO2 to O2 atmospheres.
Additively manufactured samples were pressureless-sintered at 2050oC. The oxidation was conducted under flowing CO2 in a thermogravimetric analyzer and microstructure characterization was performed to study oxidation kinetics. FactSage thermodynamics software package was utilized to assess phase stability diagrams and equilibrium compositions for the Zr-B-Si-C-O system. Results of these analyses and rationalizations of observed oxidation behaviors will be discussed. |