Impact of mechanical activation pattern and conditions on carbide formation in Ta–Zr–C SHS system
https://doi.org/10.17073/1997-308X-2016-2-30-40
Abstract
The paper studies how the pattern and conditions of Ta–Zr–C reaction mixture mechanical activation affect the phase composition and microstructure of the charge and synthesis products. It was found that the microstructure of the charge processed in a planetary centrifugal mill for the same time periods strongly depends on the MA patterns with the different sequence of the components addition. Phase composition of the mixtures is the same since no formation of chemical reaction products in the mill drums was detected. The increase in processing time for all of the tested MA patterns leads to the growth of crystal tantalum lattice microstrain and reduces its coherent scattering area, indicating the increasing amounts of stored energy. The study of the activation environment (air, argon or vacuum) impact revealed that with MA in the air the SHS product is practically a single-phase binary carbide (Ta, Zr)C with less than 3 wt.% of ZrO2. The synthesis of the reaction mixtures activated in an oxygen-free atmosphere discovered 3 carbide phases TaC, ZrC and (Ta, Zr)C with no ZrO2 traces. The optimal SHS MA modes were defined which ensure obtaining of 100 % singlephase solid solution (Ta, Zr)C with a lattice parameter of a = 0,4488 nm that corresponds to 15 at.% of ZrC in a binary carbide.
About the Authors
V. V. Kurbatkina
SHS of MISIS–ISMAN
Russian Federation
Russian Federation
Ph. D., Leading Researcher of the Scientific-educational centre,
119049, Russia, Moscow, Leninsky pr., 4
E. I. Patsera
SHS of MISIS–ISMAN
Russian Federation
PhD, Researcher of the Scientific-educational centre
Russian Federation
PhD, Researcher of the Scientific-educational centre
E. A. Levashov
MISIS
Russian Federation
Russian Federation
Dr. Sci. (Tehn.), Prof., Acad. of RANS,
Director of the Scientific-educational centre SHS of MISIS–ISMAN,
Head of Department of powder metallurgy and functional coatings of MISIS
S. A. Vorotylo
MISIS
Russian Federation
Graduate Student of the Department of powder metallurgy and functional coatings
Russian Federation
Graduate Student of the Department of powder metallurgy and functional coatings
A. N. Timofeev
Open Joint Stock Company «Composite»
Russian Federation
Russian Federation
Dr. Sci. (Tehn.), 1-st Deputy Director General,
141070, Moskovskii reg., Korolev, Pionerskaya str.,4
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Review
For citations:
Kurbatkina V.V., Patsera E.I., Levashov E.A., Vorotylo S.A., Timofeev A.N. Impact of mechanical activation pattern and conditions on carbide formation in Ta–Zr–C SHS system. Powder Metallurgy аnd Functional Coatings (Izvestiya Vuzov. Poroshkovaya Metallurgiya i Funktsional'nye Pokrytiya). 2016;(2):30-40. (In Russ.) https://doi.org/10.17073/1997-308X-2016-2-30-40
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