Effect of Ni content on the microstructure, mechanical properties and erosive wear of Mo2NiB2–Ni cermets

This work revealed the effects of Ni content on the microstructure, mechanical properties and erosive wear of Mo2NiB2–Ni cermets. Four groups of Mo2NiB2–Ni cermets with different Ni contents were fabricated by reaction boronizing sintering in this study, and their mechanical properties were tested....

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Bibliographic Details
Published in:Ceramics international 2019-11, Vol.45 (16), p.19695-19703
Main Authors: Zhang, Lei, Huang, Zhifu, Liu, Yangzhen, Shen, Yupeng, Li, Kemin, Cao, Zhen, Ren, Zijun, Jian, Yongxin
Format: Article
Language:English
Subjects:
Erosive wear
Mechanical properties
Mo2NiB2–Ni cermets
Ni content
Volume fraction
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Summary:This work revealed the effects of Ni content on the microstructure, mechanical properties and erosive wear of Mo2NiB2–Ni cermets. Four groups of Mo2NiB2–Ni cermets with different Ni contents were fabricated by reaction boronizing sintering in this study, and their mechanical properties were tested. The results show that the microstructure of the cermets can be obviously refined with the Ni/B increasing from 0.9 to 1.2, and the cermets of Ni/B 1.1 have the best mechanical properties (hardness HRA 90.3 and fracture toughness 24.3 MPa m1/2). Moreover, under high-speed slurry (artificial seawater mixed with SiO2 sand) erosive wear, the cermets of Ni/B 0.9 and 1.0 indicate high wear rate with the aggravated eroded surfaces. However, the cermets of Ni/B 1.1 achieve the minimum wear rate with relatively complete eroded surface, which is attributed to the interaction of Mo2NiB2 hard phase and Ni binder phase with appropriate ratio of two phases.
ISSN:0272-8842
1873-3956
DOI:10.1016/j.ceramint.2019.06.221