| About this Abstract |
| Meeting |
2020 TMS Annual Meeting & Exhibition
|
| Symposium
|
11th International Symposium on High Temperature Metallurgical Processing
|
| Presentation Title |
M-44: Synthesis of Porous Graphite by Dealloying of Silicon Carbide |
| Author(s) |
Gina Greenidge, Jonah Erlebacher |
| On-Site Speaker (Planned) |
Gina Greenidge |
| Abstract Scope |
Liquid metal dealloying (LMD) is a well-established technique used to produce a variety of nano-porous materials from a homogeneous alloy. While this method has been used previously to fabricate bi-continuous porous graphite via the selective dissolution of Mn from a Mn-C precursor, we have prepared porous graphite using a ceramic precursor, instead of a metal containing alloy. In this work, we investigate the kinetics of LMD using SiC immersed in liquid germanium at high temperatures (up to 1400oC) by examining the effects of dealloying duration and temperature on the precursor. We compare the dealloying mechanism of our ceramic system with conventional metal dealloying and have found that both exhibit diffusion-limited kinetics, where the rate-limiting step is the diffusion of the dissolving species away from the dealloying interface. The graphitic material produced exhibits characteristic features of nanographite, i.e., defect-rich nano-crystalline graphite and a Raman spectrum with an ID/IG ratio of 0.5. |
| Proceedings Inclusion? |
Planned: |