A Development Methodology for Copper End Termination Paste-Part 2: Defects in Fired Termination

摘要

Copper-based pastes have emerged as end termination material of choice for ceramic capacitors with base metal internal electrode. The necessity to sinter the termination in nitrogen atmosphere puts restriction on raw material selection of the paste. Effect of raw materials and the paste properties on the green cosmetic defects were described in an earlier paper. In this paper, general approaches to eliminate sintering related defects such as porosity, blisters, termination lift-off, glassing etc. are described. Finally, properties of an optimized copper termination, which can be processed between 800-825°C, are discussed.