Effect of reinforcement on microstructure and friction properties of Fe-C-Cu system powder metallurgy
In this paper,the microstructure and friction and wear properties of B4Cp and carbon nanotube CNT reinforcements in powder metallurgy Fe-C-Cu alloys with independent composition design were studied. The structure and morphology were investigated by SEM and XRD. It is found that the addition of 0.16％ B4Cp and 0.22％ CNT reinforcements inhibite the formation of pearlite,and the degree of inhibition of B4Cp is the most se-rious. Compared with the samples without reinforcements,the pearlite of CNT reinforcement samples is slightly reduced. The hardness of samples without reinforcement,CNT samples and B4Cp samples are 115.45HV,103.58HV,100.41HV. The addition of reinforcements does not generate new phases in Fe-C-Cu-based powder metallurgy,and CNT reinforcements have a better strengthening effect on Fe-C-Cu-based powder metallurgy. The B4Cp reinforcement has a negative effect on the strengthening effect of Fe-C-Cu powder metallurgy. In terms of friction and wear properties,the friction coefficient of the sample added with CNT reinforcement is the lowest,only about 0.05,and the wear scar width is only 537.8 μm. The friction coefficient of the sample without rein-forcement is about 0.15,and the wear scar width is 992.4 μm. The friction coefficient of the B4Cp reinforcement exceeds 0.2,and the wear scar width is 978.2 μm.
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