Accessible Unlicensed Requires Authentication Published by De Gruyter October 15, 2015

Effect of Cr3C2 content on the microstructure and properties of Mo2NiB2-based cermets

Lang Xie, XiaoBo Li, Dan Zhang, ChengMing Yang, FuCheng Yin and YiFeng Xiao

Abstract

Four series of Mo2NiB2-based cermets with Cr3C2 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 Cr3C2 completely dissolved in Mo2NiB2-based cermets. Cr3C2 addition improved the wettability of the Ni binder phase on the Mo2NiB2 hard phase, which resulted in a decrease in the porosity and an increase in the phase uniformity. The cermets with 2.5 wt.% Cr3C2 content showed relatively fine grains and almost full density. A high Cr3C2 content resulted in the formation of M6C (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 Cr3C2 content. The cermets with 2.5 wt.% Cr3C2 addition exhibited the highest transverse rupture strength of 2210 MPa, whereas the cermets without Cr3C2 addition exhibited the highest hardness.


*Correspondence address, Lang Xie, School of Materials Science and Engineering, Xiangtan University, Xiangtan 411105, Hunan, P.R. China, Tel.: +8615200320281, Fax: +86073158292213, E-mail:

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Received: 2015-03-11
Accepted: 2015-06-09
Published Online: 2015-10-15
Published in Print: 2015-10-14

© 2015, Carl Hanser Verlag, München