Ceramic reinforced metal composite for hermetic bodies for implantable devices
AssigneeGreatbatch Ltd.
InventorsChristine A. Frysz, Dallas J. Rensel, Brian P. Hohl, Jonathan Calamel, Xiaohong (Shawn) Tang
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Abstract
A ceramic reinforced metal composite (CRMC) comprising a composition composite as an interpenetrating network of at least two interconnected composites is described. The interpenetrating networks comprise a ceramic matrix composite (CMC) and a metal matrix composite (MMC). The composition composite is particularly useful as an electrically conductive pathway extending through the insulator or ceramic body of a hermetically sealed component, for example, a feedthrough in an active implantable medical device (AIMD).
Claims2
A composite particle powder, consisting of:
- a) platinum particles that are mechanically connected and chemically bonded to alumina particles without the alumina particles having been sintered to each other or having undergone a phase change, wherein the mechanically connected and chemically bonded platinum-alumina composite particles are a powder ranging in size from about 1 μm to about 50 μm, and
- b) wherein:
- i) as exhibited by transmission electron microscopy, an interface between the mechanically connected and chemically bonded platinum-alumina composite particles comprises visible intermingled platinum and alumina atoms that have disorder and dislocation;
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- ii) as exhibited by transmission electron microscopy selected area electron diffraction, the crystallographic structure at the interface between the mechanically connected and chemically bonded platinum-alumina composite particles comprises a lattice point row that defines a zone axis intersected by platinum and alumina lattice planes that are parallel;
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- iii) as defined by a redistribution of valence charge determined by transmission electron microscopy-electron energy-loss spectroscopy, the mechanically connected and chemically bonded platinum-alumina composite particles have atomic bonding.
Dependencies are inferred from the claim text.