Controllable Preparation and Properties of Layered Al2O3/EP Composites

Abstract

Abstract: The Al₂O₃ 3D network skeletons with layered structure were constructed by ice template method. The epoxy (EP) was successfully infiltrated into the pores of porous Al₂O₃ material by vacuum impregnation process, and finally the Al₂O₃/EP composites were prepared. The influences of wedge silicone rubber angle, slurry solid content and freezing temperature on the microstructure of layered Al₂O₃ 3D network skeleton were investigated. And the influence of the lamellar spacing on the thermal, dielectric and insulation properties of Al₂O₃/EP composites was analyzed. The results show that the order of layered Al₂O₃ 3D network skeleton is the best with the wedge silicone rubber angle of 10° and 15°. Simultaneously, the lamellar spacing in the Al₂O₃ 3D network skeleton decreases with the increase of solid content and the decrease of freezing temperature. The thermal conductivity and dielectric constant of Al₂O₃/EP composites increase with the decrease of the lamellar spacing, but the volume resistivity shows a decreasing trend. When the lamellar spacing is 45 μm, the thermal conductivity reaches 0.52 W/(m·K) and the volume resistivity is 10¹² Ω·cm.

Key words: Al₂O₃ 3D network skeleton, Al₂O₃/EP composite, ice template method, thermal conductivity, dielectric constant, volume resistivity

CLC Number:

TB332

HOU Junfeng, TANG Pengcheng, TIAN Shaohua, ZHANG Mingzhe, WU Jisi. Controllable Preparation and Properties of Layered Al₂O₃/EP Composites[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2023, 42(6): 2273-2280.

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Controllable Preparation and Properties of Layered Al₂O₃/EP Composites

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