Alumina ceramic tungsten metallization paste, its preparation method and application

Abstract

This invention discloses a tungsten metallization paste for alumina ceramics, its preparation method, and its application, belonging to the technical field of tungsten metallization pastes. The tungsten metallization paste is used for co-firing with alumina ceramics containing 92%–96% alumina. The tungsten metallization paste comprises, by mass ratio: 65%–87% conductive tungsten powder, 3%–15% inorganic binder phase, and 10%–30% organic carrier. The total mass ratio of the conductive tungsten powder, the inorganic binder phase, and the organic carrier is 100%. The inorganic binder phase comprises 92%–96% Al₂O₃ powder and 0.5%–7.5% sintering aids, including rare earth oxides and alkali metal oxides. The organic carrier comprises 8%–38% organic binder, 10%–50% plasticizer, and 3%–75% solvent. The tungsten metallization paste of this invention has advantages such as good fluidity, good thixotropy, high resolution, and low sheet resistance, with a sheet resistance value in the range of 9–28 mΩ / □.