Effect of Particle Sizes of Nickel Powder on Thermal Conductivity of Epoxy Resin-Based Composites under Magnetic Alignment

Abstract

Magnetically oriented three-phase composite systems of epoxy resin, aluminum nitride, and nickel have been prepared, the thermal conductivity of composites filled with nickel powder with different particle sizes and content under different applied magnetic fields was studied. The vibrating scanning magnetometer (VSM) and scanning electron microscopy (SEM) were applied to investigate the dispersion of nickel powder in the composites. The results showed that the anisotropic thermal conductivity of the composites treated by applied magnetic field forming chain structure is obtained. The epoxy resin-based composites filled with 30 vol% aluminum nitride with particle size of 1 μm and 2 vol% nickel powder with particle size of 1 μm and aligned with vertical magnetic field have the highest thermal conductivity (1.474 W/mk), which increases the thermal conductivity of the composites by 737% and 58% compared to the pure epoxy resin (0.2 W/mk) and the composites filled with 30 vol% aluminum nitride (0.933 W/mk). In addition, we simulated the influence of nickel powder particles with different particle sizes and arrangements on the thermal conductivity of the composite material in COMSOL Multiphysics software, and the results were consistent with the experimental results.

Thermal behavior and dielectric response of epoxy–boron nitride composites reinforced with short human hair fiber

“…[9] However, in comparison with synthetic fibers/fillers, they possess very low thermal conductivity and poor thermal stability, which limits their use in different electrical and electronic applications where better thermal conductivity is an utmost requirement to transfer the aggregate heat (generated due to overheating of the device) from the device. [11][12][13] Earlier, many researchers have tried to improve the conductivity of the polymer with the incorporation of various types of traditional carbonaceous [14,15] (e.g., carbon black, graphite particulate) and metallic [16][17][18] (e.g., aluminum, copper, nickel) fillers. Some other researchers have also concentrated on composites with different types of potential ceramic fillers such as aluminum nitride (AlN), [19,20] alumina (Al 2 O 3 ), [21,22] silicon carbide (SiC), [23,24] and silicon nitride (Si 3 N 4 ).…”

Influences of Dispersions’ Shapes and Processing in Magnetic Field on Thermal Conductibility of PDMS–Fe3O4 Composites

“…Different strategies were tested to enhance the thermal conductivity of polymer-magnetic nanoparticles composites, such as core-shell structures or other additives in the composite [32][33][34][35][36][37][38][39]. However, the effect of a magnetic field, used to align the magnetic nanoparticles during the polymerization process, on the thermal properties of the composite was less studied [40].…”

Recent Advances in Design and Preparation of Polymer-Based Thermal Management Material

“…Under the low CuNWs load of 1.8 vol%, the thermal conductivity of flexible silicone rubber-based composites impregnated copper nanowires is 3.1 ± 0.2 Wm −1 K −1 (about 19 times that of pure silicone rubber). Jin et al [ 60 ] prepared a series of epoxy resin/aluminum nitride/Ni composites with different particle sizes of Ni powder. The results show that the thermal conductivity of composites is highest, which is 1.474 Wm −1 K −1 , higher than that of epoxy resin/aluminum nitride composites when 2 vol% Ni powders with particle size of 1 µm is added.…”