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Evaluation of Exothermic Reactions in Cofired Platinum /Alumina Microsystems
Keywords: alumina, platinum, cofire
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 development of a cofired materials system, including interconnect and high density via structures. Reactions previously unreported have been investigated, including the catalytic reaction with organic binders, the reduction of alumina into PtAl3 and the reduction of the melting point of platinum 300 - 5000C below its melting point, independent of the particle size (nano to micron size particles) or particle morphology. Firing atmosphere (air, hydrogen, inert), firing profiles and additives to control thermal expansion was evaluated to minimize exothermic reaction using high temperature X-ray diffraction, FIB nano-machining, SEM with EDS analysis and TEM for each of these conditions.
Kinzy Jones, Professor
Florida International university
Miami, FL

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