Black conductive thick film compositons, electrodes, and methods of forming thereof

摘要

This invention is directed to black conductive compositions, black electrodes made from such compositions and methods of forming such electrodes. The black conductive compositions according to the invention comprise, based on the weight of the total composition:
3-50 weight percent of conductive metal oxide particles selected from RuO₂, ruthenium polyoxide, and mixtures thereof;
25-85 weight percent organic matter comprising organic polymer binder and organic solvent; and
5-70 weight percent of one or more lead-free bismuth glass binders wherein said glass binder comprises, based on the total weight of the glass binder: 55-85% Bi₂O₃, 0-20% SiO₂, 0-5% Al₂O₃, 2-20% B₂O₃, 0-20% ZnO, 0-15% of one or more of oxides selected from BaO, CaO, and SrO; and 0-3% of one or more of oxides selected from Na₂O, K₂O, Cs₂O, Li₂O and mixtures thereof; and
wherein the softening point of said glass binder is in the range 400- 600°C; and
wherein said composition is lead-free or substantially lead-free.