Abstract
Bimetallic 73 wt.% Fe–Cu nanoparticles have been produced using electric explosion of two immiscible metal wires and then consolidated into disks using magnetic pulse compaction. The compacted disks have been characterized for phase composition, mechanical strength, and high-temperature steel ball-on-disk sliding friction. The sample possessed good flexural and compression strength. Friction and wear reduction were observed during sliding test at 400 °C, which was explained by intense tribosynthesis of cuprospinel CuFe2O4 nanoparticles, which served to reduce adhesion between the ball and disk.
Highlights
The interest in preparing and using Fe–Cu pseudo-alloys started since the 1940s [1]
The dissimilar metal explosion of intertwined wires (EEIW) was a fast-occurring process, which was characterized by fast changes in the process parameters such as current, voltage, and input energy belonging to different wires (Figure 1)
In distinction to many other methods, the electric explosion of wire (EEW) bimetallic Fe–Cu particles were produced using the electric explosion of dissimilar metal wires, i.e., a unique process that allows mixing metals in a liquid state
Summary
One of the potential applications was improving the wear resistance of materials used in tribotechnical devices. The sintered iron–copper alloys were used as electrotechnical material for asynchronous motors since they possessed optimum magnetic permeability and specific electrical resistance [2]. Fe–Cu composites [3] containing from 2 to 40 mass% Cu had higher mechanical strength as compared to pure iron ones, despite the fact that their tribological behavior was almost similar to that of pure iron composites. The Fe–Cu composites containing more than 10 to 70 mass.% Cu demonstrated improved corrosion resistance and tribological characteristics comparable to those of anti-friction bronzes. One of the feasible applications for Fe–Cu composites is automotive brake pads and the tests show a stable friction coefficient as well as high durability during tribological tests [4]. It was shown that friction was reduced for the low-copper composites under constant load and increased for the incrementally increased load
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