Effect of w(Fe)/w(Ni) Ratio on Mo2FeB2 Based Cermet

doi:10.12068/j.issn.1005-3026.2023.09.007

Abstract

Abstract: Mo₂FeB₂ based cermets with different w(Fe)/w(Ni)(10∶0， 7∶3， 5∶5， 3∶7) were prepared by the vacuum liquid phase sintering with MoB， Fe， Ni， and Cr powders as raw materials. The effects of w(Fe)/w(Ni) on the phase compositions， microstructures and mechanical properties of cermets were investigated. The results showed that the compositions of hard and binder phases of boride-based cermet with different w(Fe)/w(Ni) were different. When w(Fe)/w(Ni) of 3∶7， the hard phase was composed of Mo₂NiB₂ and Mo₂FeB₂; while in the cases of other w(Fe)/w(Ni)， the hard phase was Mo₂FeB₂. At 1350℃， the microstructure of cermets was uniform and the size of pore is minimized， with the increase of sintering temperature， the hard-phase particles aggregated and the microstructure was not homogeneous， which led to the decrease of mechanical properties. After sintering at 1350℃ for 2h， the hardness and bending strength of the obtained cermet(w(Fe)/w(Ni)=10∶0) reached the maximum， which were 82.1 HRA and 1498.7MPa respectively. Meanwhile， the analysis of fracture morphology revealed that a large number of dimples and rich tearing edges are closely related to the improvement of the bending strength of cermets.

Key words: w(Fe)/w(Ni); cermet; microstructure; hardness; bending strength

CLC Number:

TG148

LIU Jun-ru， ZHANG Guo-hua， ZHOU Guo-zhi. Effect of w(Fe)/w(Ni) Ratio on Mo₂FeB₂ Based Cermet[J]. Journal of Northeastern University(Natural Science), 2023, 44(9): 1269-1278.

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Effect of w(Fe)/w(Ni) Ratio on Mo₂FeB₂ Based Cermet

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