Journal
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
Volume 39, Issue 5, Pages 1796-1802Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.jeurceramsoc.2018.11.004
Keywords
Ultra-high temperature ceramics; High entropy; Oxidation; Ellingham
Categories
Funding
- U.S. Office of Naval Research MURI program [N00014-15- 1-2863]
- Virginia Space Grant Fellowship
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Multi-principal component materials (MPCMs) are currently being investigated for use in high and ultra-high temperature environments. The design of oxidation resistant multi-component materials requires as input the oxidation behavior of each of the components. FactSage free energy minimization software and databases were used to calculate the equilibrium oxide phases and free energies of formation for the oxides of the Group IV, V and VI refractory metals, and their carbides, nitrides and borides. The results are summarized in Ellingham diagrams. Periodic trends were noted; Group IV elements form the most stable oxides with the highest melting temperatures (T-m), Group V elements form oxides with low T-m and Group VI elements form gaseous oxide species. Oxygen diffusion data from literature for some of these oxides were also reviewed and summarized. The results are utilized to identify strategies for optimizing oxidation resistance of MPCMs for service at temperatures above 1700 degrees C.
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