Microstructure and properties of BN/Ni-Cu composites fabricated by powder technology

Abstract

Microsize 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 N 2 /H 2 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/NiCu 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.

A Novel Comparative Study Based on the Economic Feasibility of the Ceramic Nanoparticles Role’s in Improving the Properties of the AA5250 Nanocomposites

“…Furthermore, the SiC, VC, and BN nanoparticles significantly improved the tribological behavior of AA5250 based MMC. In contrast, reinforcing the matrix with Al 2 O 3 shows a slight increase in the wear resistance than the other ceramics particles, these results are consistent with [26,[40][41][42].…”

“…Furthermore, the SiC, VC, and BN nanoparticles significantly improved the tribological behavior of AA5250 based MMC. In contrast, reinforcing the matrix with Al2O3 shows a slight increase in the wear resistance than the other ceramics particles, these results are consistent with [26,[40][41][42]. Table 4 shows the experimental wear volume loss, the AA5250 alloy exhibits a significant wear volume loss of 3.41 × 10 −3 mm 3 at 10 N load.…”

Design of dual‐conductive polyacrylonitrile‐based composite nanofiber: Synergistic effect of copper nanoparticles decorated‐boron nitride and polyaniline

“…7,71,72 Figure 2D represents XRD patterns of the hBN, BN@Cu, and BN@Cu/PANI nanocomposites. hBN has 7,79 and a shift to the right at the characteristic peak of BN at 28.1 were observed. XRD pattern of the BN@Cu/PANI showed amorph structure and two new peaks at 18.1 and 25.66 due to the repetition of the benzenoid and quinoid rings of the PANI chains.…”

Facile synthesis of two-dimensional copper terephthalate for efficient electrocatalytic CO2 reduction to ethylene

“…This results in wide product distributions and undesired H 2 evolution, therefore inhibiting large-scale implementation. From this scenario, endeavours have been initiated to improve the activity and selectivity by crystal facet engineering [28], heteroatom doping [29,30], alloying [31,32], construction of hybrids [33][34][35][36] or through control of morphology [37], oxidation state [38] of Cu catalysts. Despite rapid progress that has been made in ECR after decades of exploration, the viability of CO 2 electrolysis from a commercial perspective still needs to overcome key hurdles such as large kinetic overpotential (up to 1.0 V for C 2þ products), insufficient current density and low selectivity for C 2þ products, among others.…”