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      Effect of Cr 3C 2 content on the microstructure and properties of Mo 2NiB 2-based cermets

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          Abstract

          Four series of Mo 2NiB 2-based cermets with Cr 3C 2 addition of between 0 and 7.5 wt.% in 2.5 wt.% increments were studied by means of scanning electron microscopy, energy dispersive X-ray analysis and X-ray diffractometry. The transverse rupture strength and hardness were also measured. It was found that Cr 3C 2 completely dissolved in Mo 2NiB 2-based cermets. Cr 3C 2 addition improved the wettability of the Ni binder phase on the Mo 2NiB 2 hard phase, which resulted in a decrease in the porosity and an increase in the phase uniformity. The cermets with 2.5 wt.% Cr 3C 2 content showed relatively fine grains and almost full density. A high Cr 3C 2 content resulted in the formation of M 6C ( M = Mo, Cr, Ni) phase. In addition, energy dispersive X-ray spectroscopy results showed that the content of Mo in the binder decreased with increasing Cr 3C 2 content. The cermets with 2.5 wt.% Cr 3C 2 addition exhibited the highest transverse rupture strength of 2210 MPa, whereas the cermets without Cr 3C 2 addition exhibited the highest hardness.

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          Effect of Cr 3 C 2 content on the microstructure and properties of Mo 2 NiB 2 -based cermets

          Four series of Mo 2 NiB 2 -based cermets with Cr 3 C 2 addition of between 0 and 7.5 wt.% in 2.5 wt.% increments were studied by means of scanning electron microscopy, energy dispersive X-ray analysis and X-ray diffractometry. The transverse rupture strength and hardness were also measured. It was found that Cr 3 C 2 completely dissolved in Mo 2 NiB 2 -based cermets. Cr 3 C 2 addition improved the wettability of the Ni binder phase on the Mo 2 NiB 2 hard phase, which resulted in a decrease in the porosity and an increase in the phase uniformity. The cermets with 2.5 wt.% Cr 3 C 2 content showed relatively fine grains and almost full density. A high Cr 3 C 2 content resulted in the formation of M 6 C ( M = Mo, Cr, Ni) phase. In addition, energy dispersive X-ray spectroscopy results showed that the content of Mo in the binder decreased with increasing Cr 3 C 2 content. The cermets with 2.5 wt.% Cr 3 C 2 addition exhibited the highest transverse rupture strength of 2210 MPa, whereas the cermets without Cr 3 C 2 addition exhibited the highest hardness.
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            Author and article information

            Journal
            ijmr
            International Journal of Materials Research
            Carl Hanser Verlag
            1862-5282
            2195-8556
            14 October 2015
            : 106
            : 10
            : 1101-1106
            Affiliations
            a School of Materials Science and Engineering, Xiangtan University, Hunan, PR China
            b Key Laboratory of Materials Design and Preparation Technology of Hunan Province, Xiangtan University, Xiangtan, PR China
            c Key Laboratory of Low Dimensional Materials & Application Technology of Ministry of Education, Xiangtan University, Hunan, PR China
            Author notes
            [* ] Correspondence address, Lang Xie, School of Materials Science and Engineering, Xiangtan University, Xiangtan 411105, Hunan, P.R. China, Tel.: +8615200320281, Fax: +86073158292213, E-mail: langxie_xtu@ 123456hotmail.com
            Article
            MK111283
            10.3139/146.111283
            3654fef8-dc59-40f9-9a56-22e79f7a5c17
            © 2015, Carl Hanser Verlag, München
            History
            : 11 March 2015
            : 9 June 2015
            : 10 August 2015
            Page count
            References: 20, Pages: 6
            Categories
            Original Contributions

            Materials technology,Materials characterization,Materials science
            Mechanical properties,Mo2NiB2-based cermets,Cr3C2 ,Microstructure

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