期刊
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
卷 103, 期 12, 页码 6860-6868出版社
WILEY
DOI: 10.1111/jace.17395
关键词
carbon; impedance spectroscopy; silicon carbide; ultrahigh temperature
资金
- National Science Foundation [DMR-1726294, ECCS1542015]
- Army Research Office [W911NF-17-1-0570]
This study reports the complex impedance and alternative current conductivity of polymer-derived ceramic SiC (PDC-SiC) annealed at ultrahigh temperatures. The PDC-SiC shows an inductive response when annealed at temperatures of 1700 degrees C-1900 degrees C due to the percolation of turbostratic carbon. The material returns to a capacitive response at an annealing temperature of 2000 degrees C due to the dissolution of carbon into the SiC lattice. The electrical resistance of the carbon phase decreases with the increase in annealing temperature. These results provide new insights into the effects of processing temperature on microstructure evolution and electrical and dielectric property development of the PDC-SiC ceramic system.
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