Processing of ZrC-Mo Cermets for High Temperature Applications, Part I: Chemical Interactions in the ZrCMo System
The chemical compatibility of ZrC and Mo was investigated in carburizing and carbon-free environments at temperatures from 1700° to 2200°C. Heating in the carburizing atmosphere resulted in the complete reaction of Mo with C, while the carbon-free atmosphere resulted in retained metallic phase with a maximum of 13.8 mol% Mo2C formed. the presence of Mo2C was not detected at 2100°C in the carbon-free atmosphere, confirming the existing phase equilibria in the Zr-Mo-C system. Heat treatments in the carbon-free atmosphere also showed liquid formation at 2200°C, as evident from microstructure analysis. Liquid formation was consistent with the interaction between Mo and Mo2C. the liquid was found to comprise at least 7 vol% of the total component, based on a phase diagram for the Mo-C system. the formation of a liquid should allow for the processing of ZrC-Mo cermets by liquid-phase pressureless sintering.
S. E. Landwehr et al., "Processing of ZrC-Mo Cermets for High Temperature Applications, Part I: Chemical Interactions in the ZrCMo System," Journal of the American Ceramic Society, Wiley-Blackwell, Jan 2007.
The definitive version is available at http://dx.doi.org/10.1111/j.1551-2916.2007.01667.x
Materials Science and Engineering
Keywords and Phrases
Chemical Interactions; High Temperature Applications; ZrC-Mo Cermets; ZrCMo System; Ceramic metals; Toxicological interactions
Article - Journal
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