Application of Conductive Polymer Technology to the Production of a Novel Multilayer Capacitor

摘要

Multilayer ceramic capacitors, due to their large capacitance, reduced volume and low cost, have become one of the fastest growing technologies in eletronic devices. Present technology uses barium titanate as the dielectric which requires the use of precious metal (Pd, Pt, Au) internal electrodes as a result of the high firing temperatures (1300-1400C). These precious metals are responsible for 50 to 60% of the total cost of the capacitor and are subject to strategic foreign disruption. It is the goal of this investigation to evaluate the feasibility of using a polymer based dielectric and a polymer thick film metal electrode to build a multilayer capacitor that would eliminate the need for precious metals. Once this is accomplished, the next phase would ultimately involve the replacement of the silver in the polymer thick film electrode with synthetic metals. The work involved and extensive literature review, discussions with researchers active in this field and the testing of prototype polymer capacitors. Evaluations were carried out based on capacitance, permittivity dissipation factor and short-term stability. The initial results were considered encouraging and a continuing effort in this direction is most feasible.