Abstract
New techniques for thermal management in ceramics at the nanoscale level have been investigated using low percentages of carbon nanotubes to reduce thermal conductivity of bulk ceramics. Samples of yttria-stabilized zirconia containing purified single-walled carbon nanotubes (SWNT) or vapor grown carbon fibers (VGCF) have been prepared by tape casting and analyzed using the laser flash method to evaluate reductions in thermal conductivity at high temperatures. New features in the samples due to the presence of carbon nanotubes have been characterized using Raman, SEM, TEM and, in the case of VGCFs, are related to significant reductions in thermal conductivity (>25%). The inclusion of a low percentage of nanoscale carbon fibers, the intimate relationship between the fibers and ceramic particles, and the indication that the fibers possess a crystalline overcoating, all contribute to the lowering of the thermal conductivity.
| Original language | English |
|---|---|
| Pages (from-to) | A1741-A1746 |
| Journal | Materials Research Society Symposium - Proceedings |
| Volume | 633 |
| State | Published - 2001 |
| Externally published | Yes |
Funding
The authors acknowledge the primary support of the Office of Naval Research (Contract #N00014-99-1-0246) and partial support from NASA’s Graduate Cooperative Education Program in addition to the valuable advice and assistance of the nanotube team at NASA’s Johnson Space Center. This research was also partially sponsored by the Assistant Secretary for Energy Efficiency and Renewable Energy, Office of Transportation Technologies, as part of the High Temperature Materials Laboratory User Program, Oak Ridge National Laboratory, managed by UT-Battelle, LLC, for the U.S. Department of Energy under contract number DE-AC05-00OR22725.
| Funders | Funder number |
|---|---|
| UT-Battelle | |
| Office of Naval Research | #N00014-99-1-0246 |
| U.S. Department of Energy | DE-AC05-00OR22725 |
| Office of Energy Efficiency and Renewable Energy | |
| Kennedy Space Center | |
| Oak Ridge National Laboratory | |
| Water Power Technologies Office |