1. Conditions for fabricating single-phase (Ta, Zr)C carbide by SHS from mechanically activated reaction mixtures.
- Author
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Kurbatkina, V.V., Patsera, E.I., Vorotilo, S.A., Levashov, E.A., and Timofeev, A.N.
- Subjects
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TANTALUM compounds , *ZIRCONIUM carbide , *NANOFABRICATION , *SELF-propagating high-temperature synthesis , *CHEMICAL reactions , *MECHANICAL properties of metals - Abstract
The process parameters for the fabrication of binary carbide (Ta, Zr)C using MA–SHS were optimized. After MA processing in air, the SHS product was the virtually single-phase binary carbide (Ta, Zr)C with a ZrO 2 content less than 3%. Activation of the exothermic mixture in argon or under vacuum did not give rise to the single-phase product because the TaC and ZrC phases were present in addition to (Ta, Zr)C. Introduction of excess carbon, an increase in the combustion and post-reaction temperatures, and an increase in the duration of thermal relaxation using a “chemical oven” yielded the single-phase (Ta, Zr)C solid solution with lattice parameter a =0.4493 nm, which corresponds to 17.5 at% of dissolved ZrC. Dense samples were fabricated from submicron-sized carbide powder via hot pressing and spark plasma sintering; their properties were studied. [ABSTRACT FROM AUTHOR]
- Published
- 2016
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