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Abstract
Abstract In this paper, porous alumina continuum (PAC) was prepared with alumina powders (APs) by the gel-casting method and was applied to obtain silicone elastomer (SR) composites (PAC/SR) by the impregnating process. The structure was investigated by X-ray diffraction (XRD) and scanning electron microscopy (SEM). The influences of PAC on thermal conductivity and dielectric permittivity of PAC/SR composites were studied in comparison with AP/SR composites. When the alumina content was 14 vol%, the thermal conductivity of the PAC/SR composites reached 0.84 W·(m·K)−1, which was 3.1 times higher than that of the AP/SR composites. The thermal conductivity of PAC/SR and AP/SR was simulated by theoretical models, and the interfacial thermal resistance was calculated by effective medium theory, which indicated the advantages of PAC in enhancing the thermal conductivity of SR-based composites and the reduced interfacial thermal resistance between PAC and SR.
Highlights
In this paper, porous alumina continuum (PAC) was prepared with alumina powders (APs) by the gelcasting method and was applied to obtain silicone elastomer (SR) composites (PAC/SR) by the impregnating process
The thermal conductivity of the PAC/SR composites with the alumina content of 14 vol% reached 0.84 W·(m·K)−1, which increased by 3.1 times in comparison to the AP/SR composites with the same alumina content
PAC with a structured scaffold was obtained by the gelcasting method and applied in SR to construct a thermally conductive network for heat dissipation
Summary
Abstract: In this paper, porous alumina continuum (PAC) was prepared with alumina powders (APs) by the gelcasting method and was applied to obtain silicone elastomer (SR) composites (PAC/SR) by the impregnating process. The influences of PAC on thermal conductivity and dielectric permittivity of PAC/SR composites were studied in comparison with AP/SR composites. When the alumina content was 14 vol%, the thermal conductivity of the PAC/SR composites reached 0.84 W·(m·K)−1, which was 3.1 times higher than that of the AP/SR composites. The thermal conductivity of PAC/SR and AP/SR was simulated by theoretical models, and the interfacial thermal resistance was calculated by effective medium theory, which indicated the advantages of PAC in enhancing the thermal conductivity of SR-based composites and the reduced interfacial thermal resistance between PAC and SR
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