Investigation of CuAlO2 composite dielectric properties and selective metallization by laser direct structure technology

Abstract

In this work, we investigated CuAlO2 ceramic composite dielectric properties and potential application to laser direct structuring (LDS) technology. To sinter at low temperature various amounts of glass was added to CuAlO2 and their microstructure, dielectric properties were systematically investigated. The Glass +30 wt% CuAlO2 composite sintered at 800 °C for 1 h was measured to have a high relative density of 84.5 %, low dielectric constant and loss of 4.6 and 0.08 at 9.1 GHz. Using this composite after laser irradiation well-defined copper metal patterns were fabricated on ceramic composite surface. Two important factors which enabled metallization was observed to be morphology of the ceramic composite surface and reduction of Cu+, Cu2+ in the CuAlO2 composite to Cu0 after laser irradiation.