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US 4,434,134 AGranted
Pinned ceramic substrate
AssigneeInternational Business Machines Corporation
InventorsRussell E. Darrow, Joseph Funari, George S. Kotrch, George C. Phillips
Life of this patent
Estimating the term…
Abstract
Ceramic substrates are pinned using powdered metallurgy pins formed in situ on the substrate.
Claims7
A method for making a pinned ceramic substrate having plural pins outwardly extending from at least one predetermined surface thereof, said method comprising the steps of:
- providing a ceramic substrate having a plurality of first holes to be pinned, said first holes inwardly extending from a predetermined first surface of said substrate,
- filling said first holes with unsintered powdered metal particles in a temporary non-elastomer paste-like binder,
- providing a vaporizable carrier having a corresponding plurality of second holes inwardly extending from a predetermined second surface thereof,
- juxtaposing said first and second surfaces in a predetermined contacting relationship with each other, each one of said first holes being paired with a mutually exclusive one of said second holes and being in a predetermined registration relationship therewith when said first and second surfaces are in said predetermined contacting relationship,
- filling said second holes with unsintered powdered metal particles in a temporary non-elastomer paste-like binder, and
- providing a heat treatment to sinter said unsintered powdered metal particles of said first and second holes and to evaporate away said binder thereof,
- whereby said powdered metal particles in each one of said paired first and second holes is fused to form one of said pins affixed to said substrate and said carrier is evaporated away by said heat treatment,
- said binders and said carrier being evaporated away within the temperature range of 250 to 400 degrees C., and said powdered metal particles being sintered at a temperature greater than 400 degrees C., and said ceramic substrate and said powdered metal particles having compatible shrinkage characteristics, and said ceramic substrate and said powdered metal particles having compatible firing and sintering temperatures, respectively.
5 more elements
A method for making a pinned ceramic substrate having plural pins outwardly extending from at least one predetermined surface thereof, said method comprising the steps of:
- providing a ceramic substrate having a plurality of first holes to be pinned, said first holes inwardly extending from a predetermined first surface of said substrate,
- filling said first holes with unsintered powdered metal particles in a temporary non-elastomer paste-like binder,
- providing a first heat treatment to sinter said unsintered powdered metal particles of said first holes and to evaporate said binder thereof,
- providing a vaporizable carrier having a corresponding plurality of second holes inwardly extending from a predetermined second surface thereof,
- juxtaposing said first and second surfaces in a predetermined contacting relationship with each other, each one of said first holes being paired with a mutually exclusive one of said second holes and being in a predetermined registration relationship therewith when said first and second surfaces are in said predetermined contacting relationship,
- filling said second holes with unsintered powdered metal particles in a temporary non-elastomer paste-like binder, and
- providing a second heat treatment to sinter said unsintered powdered metal particles of said second holes and to evaporate said binder thereof, whereby said powdered metal particles in each one of said paired first and second holes is fused to form one of said pins affixed to said substrate and said carrier is evaporated away by said second heat treatment,
- said binders and said carrier being evaporated away within the temperature range of 250 to 400 degrees C., and said powdered metal particles being sintered at a temperature greater than 400 degrees C., and said ceramic substrate and said powdered metal particles having compatible shrinkage characteristics, and said ceramic substrate and said powdered metal particles having compatible firing and sintering temperatures, respectively.
5 more elements
Dependencies are inferred from the claim text.