Manufacture of low expansion composites having high...

Details Manufacture of low expansion composites having high... Manufacture of low expansion composites having high...

B - Operations, Transporting

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B22F 3/12 (2006.01) B22F 1/00 (2006.01) B22F 1/02 (2006.01) C22C 33/02 (2006.01) H01L 21/48 (2006.01) H05K 1/05 (2006.01)

Patent

CA 1334132

A method of producing a composite material from a mixture of copper and a low coefficient of thermal expansion nickel-iron alloy (Invar) powder is disclosed wherein advan- tageously at least part of the copper is deposited on the Invar powder prior to processing. Processing includes cold compacting to a green strip or other configuration, annealing in the temper- ature range of 550-750°C and working the annealed material at a temperature in that range to high density.

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