Abstract
The aim of this work is to provide some experimental information within the M-C-O ternary systems (where M is a transition metal belonging to the IVB group). More particular, this study is devoted to the determination of the reaction and specific heats of the ZrCxOy, TiCxOy, HfCxOy oxicarbides and of their stability domain in their respective ternary phase diagram, these data being useful to assess more accurately the corresponding ternary systems. These compounds which exhibit a FCC solid solution over a large range of temperature [1] are of interest in nuclear and high temperature applications. So, bulk carbides and oxides were synthetized by Spark Plasma Sintering, allowing us to obtain very dense materials (close to the theoretical density). These pellets were used as carbide / oxide couples and heated to high temperatures. Chemical compositions at the equilibrium of the oxicarbide phase were then analysed in order to determine the composition and the structural evolutions of these solid solutions (the lattice parameter being directly related to the C/O ratio). Another way to obtain oxicarbides with specific compositions is based on the carboreduction of transition metal oxides [2, 3]. Thermal analysis (DTA and DSC) measurements were carried out during the carboreduction process from carbides and oxides powders mixtures to determine the heat of formation of the oxicarbide phase as a function of its C/M or O/M ratio. These results will be used for the optimization process through the PARROT module of the Thermo-Calc software.
Highlights
The aim of this work is to provide some experimental information within the M-C-O ternary systems
This study is devoted to the determination of the reaction and specific heats of the ZrCxOy, TiCxOy, HfCxOy oxicarbides and of their stability domain in their respective ternary phase diagram, these data being useful to assess more accurately the corresponding ternary systems
These compounds which exhibit a FCC solid solution over a large range of temperature [1] are of interest in nuclear and high temperature applications
Summary
The aim of this work is to provide some experimental information within the M-C-O ternary systems (where M is a transition metal belonging to the IVB group). This study is devoted to the determination of the reaction and specific heats of the ZrCxOy, TiCxOy, HfCxOy oxicarbides and of their stability domain in their respective ternary phase diagram, these data being useful to assess more accurately the corresponding ternary systems.
Sign-in/Register to view highlights & summary 
Published Version (
Free)
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
