Abstract
ABSTRACTMicrosize Powders of Ni and Cu were prepared by water atomization technique to fabricate metal matrix composites containing various percentages of nanosized boron nitride particles (1, 2, 3, 4, 5 wt. % of BN in a matrix containing (20 wt. %Ni and 80 wt. %Cu). The prepared mixtures were cold compacted under 400 MPa, and sintered for 2 h at 1000 °C in a controlled atmosphere of 3:2 N2/H2 gas mixtures. The microstructure and the chemical composition of the prepared powders as well as the consolidated composites were investigated by X-ray diffraction as well as field emission scanning electron microscope (FESEM) equipped with an energy dispersive spectrometer (EDS). The produced Cu and Ni powders have spheroid shape of size less than 100 microns, but the investigated BN has an equiaxed particle shape and particle size of ∼ 500 nm. It has been also observed that BN and Ni particles were homogeneously distributed in the Cu matrix of the present BN/Ni-Cu composites. The density, electrical resistivity, saturation magnetization and hardness of the composites were measured. It was observed that, by increasing BN content, the relative density was decreased, while the saturation magnetization, electrical resistivity and hardness were increased.
Highlights
Metal matrix composites (MMCs) are of high specific strength, specific modulus, damping capacity and good wear resistance, compared to unreinforced alloys
It could be observed that, the particle shape of as-solidified powders is mostly spherical in case of Cu and cubic to irregular in case of Ni, and is of a rough surface morphology
A preliminary study was performed in our previous work to determine the atomization conditions of metal powders
Summary
Metal matrix composites (MMCs) are of high specific strength, specific modulus, damping capacity and good wear resistance, compared to unreinforced alloys. Ceramic reinforced MMCs have a great mechanical performance [1]. There has been an increasing interest in composites containing low density and low cost ceramic reinforcements. It offers a possibility to tailor the properties of a metal by adding an appropriate ceramic reinforcement and to meet demands in physical and mechanical management. Metals as Al, Mg, Fe, Ti, Ni, Cu, Ag, Co and Nb or alloys as Ni-Cu, Zn-Co, Co-Ni, Ni-Fe were mainly used as metallic matrices [2]. Among others nickel as a durable and tough metal has been widely used, due to it’s resistant to corrosion and abrasion [3].
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