Ceramic mounting and heat sink device

Details Ceramic mounting and heat sink device Ceramic mounting and heat sink device

1975-12-23

1977-05-31

Rutledge, L. Dewayne

Stock material or miscellaneous articles

All metal or with adjacent metals

Composite; i.e., plural, adjacent, spatially distinct metal...

357 81, 428663, B32B 1504

Patent

active

040259978

ABSTRACT:
This relates to a multi-layer composite metallic sheet having a predetermined coefficient of thermal expansion for use as a heat sink and mounting arrangement when bonded to a ceramic substrate. Since copper has a coefficient of thermal expansion greater than that of ceramic and molybdenum has a coefficient of thermal expansion less than that of ceramic, layers of copper and molybdenum can be combined to provide a composite having a coefficient of thermal expansion equal to that of ceramic. To avoid a bimetallic effect, a core layer of a fused metal is sandwiched between two outer layers of the second metal.

REFERENCES:
patent: 2697130 (1954-12-01), Korbelak
patent: 2993271 (1961-07-01), Crapuchettes
patent: 3147547 (1964-09-01), Kuebrich et al.
patent: 3620692 (1971-11-01), Franklin et al.
patent: 3780795 (1973-12-01), Arnold

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