Preparation and properties of Ag-AlN/acrylate electrically conductive adhesives with high thermal conductivity

Ag-AlN was prepared by electroless plating with Pd-free activation method and the acrylate adhesive was prepared by solution polymerization method. The Ag-AlN/acrylate electrically conductive adhesives with high thermal conductivity were prepared by ultrasound-assisted solution blending method. The structures of Ag-AlN were characterized by XRD, EDS and SEM etc. The results indicate that after the high temperature and cleaning by acid cleaning fluid, the impurities on surface of AlN is removed and dense Al2O3 layer forms on surface of AlN. The Ag-AlN prepared by electroless plating with Pd-free activation method has good electrical and thermal conductivity. The electrical conductivity of Ag-AlN reaches 7.06×102 S/cm from 10-13 S/cm of AlN and the thermal conductivity reaches 230 W/(m·K) from 170 W/(m·K) of AlN. According to the calculation, the mass fraction of Ag layer on surface of Ag-AlN is 13%, the thickness of Ag layer is about 80 nm, and when the mass fraction of Ag-AlN filler in conductive adhesive is 50%, the electrical conductivity of Ag-AlN/acrylate electrically conductive adhesives is 1.9 S/cm, and thermal conductivity reaches 3.1 W/(m·K). © 2016, BUAA Culture Media Group Ltd. All right reserved.