Heat exchange – Heat transmitter
Patent
1981-12-28
1984-09-18
Richter, Sheldon J.
Heat exchange
Heat transmitter
428408, H01L 2342
Patent
active
044718373
ABSTRACT:
Efficient dissipation and uniform spreading of heat from electronic solid-state devices by their associated heat-sink structures is promoted by thin broad-area thermally-conductive mountings built up from layers of a special form of substantially pure flexible and compressible flat graphite sheet material and a bonding-and-filling coating. At least one such 5-10 mil thickness layer of Grafoil flexible sheet, involving a crushable compressed mass of expanded graphite particles which are plate-like and oriented essentially parallel with the sheet surfaces, is intimately connected with a very thin bonding-and-filling coating substantially fully along its broad-area surfaces, and the latter coating is bonded at elevated temperature and pressure into a self-adhering relationship with surfaces of a heat-sink device intended to be disposed opposite surfaces of an electronic semiconductor device from which excess heat is to escape. The coating is applied while in a liquid condition, in quantity sufficient to be effective to fill minute interstitial spaces appearing along the heat-sink surfaces and yet not so thickly as to prevent numerous point contacts from being made at sites of minute surface irregularities of the graphite sheet material and the heat-sink device. Mechanical fastening of a semiconductor device atop the prepared mounting layers of the heat-sink device compresses the crushable graphite sheet material so that voids are minimized and low thermal impedance can be realized between the heat sink and semiconductor device.
REFERENCES:
patent: 2917404 (1959-12-01), Melzer et al.
patent: 2964688 (1960-12-01), McAdam
patent: 3187226 (1965-06-01), Kates
patent: 3391242 (1968-07-01), Sudges
patent: 3404061 (1968-10-01), Shane et al.
patent: 4233645 (1980-11-01), Balderes et al.
patent: 4355684 (1982-10-01), Caines
Maximum Heat Transfer Medium, Berndlmaier et al., IBM Tech. Disc. Bull., vol. 20, No. 11A, Apr. 1978, pp. 4389-4390.
Aavid Engineering, Inc.
Mrose James E.
Richter Sheldon J.
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