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Open AccessFeature PaperArticle

Effects of Boron Addition on the Microstructure and Mechanical Properties of (Ti,Ta)(C,N)-Co Based Cermets

1
Department of Engineering and Materials Science and Transport, University of Seville, 41092 Seville, Spain
2
Materials Science Institute of Seville (CSIC-US), 41092 Seville, Spain
*
Author to whom correspondence should be addressed.
Metals 2019, 9(7), 787; https://doi.org/10.3390/met9070787
Received: 3 June 2019 / Revised: 10 July 2019 / Accepted: 12 July 2019 / Published: 16 July 2019
(This article belongs to the Special Issue Design of Cemented Carbides and Cermet)
In this work, a titanium–tantalum carbonitride based cermet, with cobalt as the binder phase and boron as a sintering additive, was developed by a mechanically induced self-sustaining reaction process using two different methodologies. The boron additive was added to prevent the formation of brittle intermetallic compounds generally formed during the liquid phase sintering step due to the excessive ceramic dissolution into the molten binder phase. A systematic study was carried out to understand the effects of boron addition on the nature of the phases, microstructure, and mechanical properties of cermets. With the boron addition, the formation of two different boride solid solutions, i.e., (Ti,Ta)B2 and (Ti,Ta)3B4, was observed. Moreover, the nature of the binder was also modified, from the (Ti,Ta)Co2 brittle intermetallic compound (for cermets without boron addition) to ductile and tough (Ti,Ta)Co3 and α-Co phases (for cermets with boron addition). These modifications caused, as a general trend, the increase of hardness and toughness in cermets. View Full-Text
Keywords: titanium carbonitride; cermet; boron; intermetallic; binder; MSR; powder metallurgy titanium carbonitride; cermet; boron; intermetallic; binder; MSR; powder metallurgy
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Chicardi, E.; Gotor Martínez, F.J. Effects of Boron Addition on the Microstructure and Mechanical Properties of (Ti,Ta)(C,N)-Co Based Cermets. Metals 2019, 9, 787.

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