Processing of ZrC-Mo Cermets for High-Temperature Applications, Part I: Chemical Interactions in the ZrC-Mo System
The chemical compatibility of ZrC and Mo was investigated in carburizing and carbon-free environments at temperatures from 1700⁰ to 2200⁰C. 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 2100⁰C 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 2200⁰C, 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 ZrC-Mo System," Journal of the American Ceramic Society, vol. 90, no. 7, pp. 1998-2002, Wiley-Blackwell, Jul 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
Carbon-free environments; Carburizing atmosphere; Chemical interactions; Liquid formation; Carburizing; Molecular interactions; Phase equilibria; Sintering; Thermal effects; Cermets
International Standard Serial Number (ISSN)
Article - Journal
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