Method of making a low thermal expansion, high thermal conductiv

Details Method of making a low thermal expansion, high thermal conductiv Method of making a low thermal expansion, high thermal conductiv

1990-12-17

1991-09-17

Lechert, Jr., Stephen J.

Specialized metallurgical processes, compositions for use therei

Compositions

Consolidated metal powder compositions

75228, 75248, 419 23, 419 38, B22F 900

Patent

active

050491849

ABSTRACT:
In a process for making a low thermal expansion, high thermal conductivity member or article suitable for bonding to a support member at a predetermined bonding temperature and for facilitating heat transfer therefrom, and in the member made thereby, first and second metal powders are combined in volumetric proportions to provide an approximation to desired thermal expansion and thermal conductivity characteristics. The powder mixture is then consolidated in a controlled manner to provide a shaped member having a thermal expansion characteristic curve that essentially matches that of the support member from about 30.degree. C. up to the bonding temperature. Consolidation of the metal powder mixture is controlled by selecting a density for the consolidated powder that results in the close expansion match over the temperature range and then consolidating the metal powder mixture to that density.

REFERENCES:
patent: 4158719 (1979-06-01), Frantz
patent: 4569692 (1986-02-01), Butt
patent: 4822693 (1989-04-01), Ashok et al.
patent: 4836979 (1989-06-01), Bell et al.
Hensel, F. R., Larsen, E. I., and Swazy, E. F., Physical Properties of Metal Compositions with a Refractory Metal Base, Powder Metallurgy, American Society for Metals, 1942, pp. 483-492.
ASM Metals Handbook, Powder Metallurgy, Ninth Edition, vol. 7, Jun., 1984, pp. 560, 561.
Tungsten: Sources, Metallurgy, Properties, and Applications, Yih and Wang (1979).

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