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Resistivity and Tribological Properties of copper hybrid composites reinforced by multi walled carbon nanotubes and nano boron carbide particles for pantograph

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Document pages: 18 pages

Abstract: In this work, the effects and contributions of multi walled carbon nanotubes (MWCNT) - boron carbide (B4C) on the mechanical and Tribological Properties of copper matrix composites were studied. Nano B4C with different weight fraction was prepared by powder metallurgy cold pressing sintering method, which contains MWCNT reinforced copper matrix composites with fixed weight fraction. The wear loss of sintered Cu – MWCNT – B4C composites was studied by sliding test on pin disk device. Due to the uniform dispersion of secondary reinforcement in copper matrix and the self-lubricating effect of multi wall carbon nanotubes, the addition of reinforcement improves the hardness and wear resistance of the composites. Effect of nanoparticles on distribution in matrix, the worn surface morphology, and the elemental composition of the composites were characterized using high-resolution scanning electron microscopy and X-ray diffraction analysis. The electrical resistivity of the fabricated copper hybrid composite preforms was evaluated using a four-point probe tester. Our results highlight the use of experiential reinforcing limits of B4C on the wear and electrical and mechanical behaviour of copper composites.

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