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(Ti,Cr)C-Based Cermets with Varied Nicr Binder Content via Elemental SHS for Perspective Cutting Tools

1
Department of Powder Metallurgy and Functional Coatings, National University of Science and Technology «MISiS», 119049 Moscow, Russia
2
Laboratory of the Combustion of Dispersed Systems, Merzhanov Institute of Structural Macrokinetics and Materials Science, 142432 Chernogolovka, Russia
*
Authors to whom correspondence should be addressed.
Crystals 2020, 10(5), 412; https://doi.org/10.3390/cryst10050412
Received: 29 April 2020 / Revised: 15 May 2020 / Accepted: 16 May 2020 / Published: 20 May 2020
(This article belongs to the Section Hybrid and Composite Crystalline Materials)
The effects of granulation of reactive mixtures Ti-Cr-C and Ti-Cr-C-Ni on the combustion temperature and velocity, as well as phase composition and mechanical properties (crushing ability) of combustion products, were studied. Granulation was associated with a 1.5-fold increase in combustion velocity, caused by a nearly 10-fold increase in gas permeability. Secondary reactions between TiC, Cr7C3, and molten Ni led to the formation of (Ti,Cr)C FCC solid solution and Ni2.88Cr1.12 intermetallics. After the combustion of Ti-Cr-C-Ni mixtures, prolonged fluorescence was registered, suggesting the exothermic nature of secondary phase formation reactions. The introduction of the nickel binder decreased the content of Cr in the solid solution (Ti,Cr)C owing to the formation of the Ni2.88Cr1.12 phase. To prevent the Cr depletion from the carbide solid solution, Ni-20%Cr binder was added to the granulated 80%(Ti + C)/20%(3Cr + 2C) mixture. Combustion of granulated mixture yielded brittle porous sinter cake, which was easy to crush and mill, whereas the combustion products from the powdered mixtures were more ductile and harder to crush. View Full-Text
Keywords: milling; composites; microstructure; carbides milling; composites; microstructure; carbides
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Vorotilo, S.; Kiryukhantsev-Korneev, P.V.; Seplyarskii, B.S.; Kochetkov, R.A.; Abzalov, N.I.; Kovalev, I.D.; Lisina, T.G.; Zaitsev, A.A. (Ti,Cr)C-Based Cermets with Varied Nicr Binder Content via Elemental SHS for Perspective Cutting Tools. Crystals 2020, 10, 412.

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