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- Title
Grain size dependence of thermally induced oxidation in zirconium carbide.
- Authors
Chaney, Donald Z.; Hirtz, John; Williams, Evan; Minnette, Jacob; Cureton, William F.; O'Quinn, Eric C.; Zhao, Xiaodong; Guo, Xiaofeng; Matsuoka, Takahiro; Koehler, Michael; Sprouster, David; Lang, Maik
- Abstract
Complementary analytical approaches were employed to probe the effect of grain size on thermally induced oxidation of zirconium carbide (ZrC) utilizing thermogravimetric analysis, differential scanning calorimetry, and Raman spectroscopy, as well as synchrotron-based and laboratory-based X-ray diffraction (XRD) experiments. The oxidation mechanism and phase behavior of nanocrystalline ZrC (grain size ~ 20 nm) were compared with that of the more documented microcrystalline ZrC (grain size ~ 1 µm). Synchrotron XRD at the Advanced Photon Source with a hydrothermal diamond anvil cell (HDAC) used as a sample chamber revealed that the onset of oxidation is at ~ 380 °C for microcrystalline ZrC which is in agreement with previous work. In contrast, the critical oxidation temperature was ~ 330 °C for nanocrystalline ZrC. Additional high-temperature synchrotron XRD experiments at the National Synchrotron Light Source II using a lamp furnace in combination with Raman analysis showed that tetragonal ZrO2 forms as an initial oxidation product and transforms at higher temperatures to the monoclinic phase. Thermogravimetric analysis (TGA) coupled with differential scanning calorimetry (DSC) confirmed the X-ray results of a lower critical oxidation temperature for the nanocrystalline sample. The phase transformations in the oxide phase with associated critical temperatures were also evident in the thermodynamic data as exothermic heat events.
- Subjects
ZIRCONIUM carbide; GRAIN size; DIFFERENTIAL scanning calorimetry; CRITICAL temperature; DIAMOND anvil cell; SYNCHROTRONS; CHEMICAL ionization mass spectrometry
- Publication
Journal of Materials Science, 2023, Vol 58, Issue 6, p2439
- ISSN
0022-2461
- Publication type
Article
- DOI
10.1007/s10853-023-08145-8