Evaluation of Exothermic Reactions in Cofired Platinum /Alumina Microsystems

摘要

Cofired platinum/ high temperature cofire ceramic (HTCC) alumina ceramic microsystems are emerging as a technology of choice for implantable medical devices due to the long reliable history of Pt wire /alumina ceramics use as feedthrough structures in pacemakers. This work evaluates the materials interactions developed in a platinum / alumina cofired materials system. Reactions previously unreported have been investigated, including the catalytic reaction with organic binders, the reduction of alumina into PtA13 and the reduction of the melting point of platinum 300 - 500 °C below its melting point, independent of the particle size (nano to micron size particles) or particle morphology. High temperature X-ray diffraction and SEM with EDS analysis were used to characterize each of these reactions.