Patent ID: 8043454
Filing Date: 2011-10-25
Classification: A61N,H01L,H05K,Y10T

Abstract:
1. A method of forming a hermetic via electrical feedthrough in a ceramic substrate comprising the steps of: selecting a glass-free electrically conductive paste; selecting 1 to 10 weight percent niobium pentoxide particulate phase; selecting a noble metal particulate phase comprising 90 to 99 weight percent platinum metal particulate phase; selecting an unfired ceramic substrate having an upper surface and a lower surface and containing through holes that extend from said upper surface to said lower surface; inserting said glass-free electrically conductive paste comprising said noble metal particulate phase, said niobium pentoxide particulate phase, and an organic vehicle in said through holes; removing said organic vehicle binder by heating said unfired ceramic substrate in air; firing said ceramic substrate and paste filled through holes at 1600° C. forming a hermetic, densified, glass-free, worm hole free electrically conductive via comprised of said glass-free electrically conductive paste; cooling said ceramic substrate to room temperature; and polishing said ceramic substrate to smooth said upper surface and said lower surface.