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.
Highlights
With the rapid development of the electronic industry towards miniaturization and high integration, thermal management of electronic devices has become an increasingly important issue [1,2,3,4].Poor heat dissipation will lead to the failure of devices to work normally, and even permanent damage to components [5,6,7]
The effect of the particle size of nickel powder on the thermal conductivity of composite systems consisting of epoxy resin, aluminum nitride, and nickel under different magnetic alignment was studied
Vibrating scanning magnetometry results showed that when the particle size of Ni powder was larger than the critical diameter, the larger the particle size of Ni powder, the smaller the coercivity of the composite material
Summary
With the rapid development of the electronic industry towards miniaturization and high integration, thermal management of electronic devices has become an increasingly important issue [1,2,3,4]. C.C. et al [20] prepared composites filled with 25% AlN and 1% multiwalled carbon nanotubes (MWCNTs), the thermal conductivity of it reached 1.21 W/mK, which is the thermal conductivity of epoxy-containing 50 vol% pristine AlN (1.25 W/mK). These mixed fillers are still randomly distributed in the composite material. The use of magnetic fields during the process of the preparation of polymer composite materials can be an effective way to orientat the filler [21,22,23] This situation allows increasing the anisotropy of the composite and preferential directions for the heat transport are created along the aligning direction of the filler aggregate. We established models in COMSOL to simulate the contribution of nickel powder of different particle sizes arranged in different directions under the induction of the magnetic field to the thermal conductivity of the composite material to verify the law in the experiment
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