Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
7898993 | Journal of the European Ceramic Society | 2013 | 8 Pages |
Abstract
Flexural creep of ZrB2-30 vol% SiC ultra high temperature ceramic composite was studied at 1700-2200 °C and 20-50 MPa using the novel method of electromagnetic Lorentz force loading of electrically heated specimens. Experiments were conducted in air and in non-oxidizing atmospheres. The apparent activation energy for creep was 344 ± 35 kJ/mol for non-oxidizing conditions. The stress exponent was 1.4 ± 0.4. The creep rate was slightly higher in air due to a decrease in the size of the load bearing substrate because of oxidation. There was no evidence of electric field effects. Creep experiments could be performed up to 2200 °C very quickly, with experiments conducted in a few minutes.
Related Topics
Physical Sciences and Engineering
Materials Science
Ceramics and Composites
Authors
Sindhura Gangireddy, John W. Halloran, Zachary N. Wing,