Title

Processing of ZrC-Mo Cermets for High-Temperature Applications, Part I: Chemical Interactions in the ZrC-Mo System

Abstract

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.

Department(s)

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)

27820

Document Type

Article - Journal

Document Version

Citation

File Type

text

Language(s)

English

Rights

© 2007 Wiley-Blackwell, All rights reserved.

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