Bimetal

Details Bimetal Bimetal

1994-05-05

1996-11-12

Zimmerman, John

Stock material or miscellaneous articles

All metal or with adjacent metals

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

428616, 428618, 428619, 428681, B32B 1518

Patent

active

055738605

ABSTRACT:
It is an object of the present invention to provide a bimetal having a same or wider proportional temperature range than a bimetal using a 42 wt % Ni--Fe alloy as a low thermal expansion alloy, and a higher bending characteristic of a large bending coefficient than a bimetal using a 36 wt % Ni--Fe alloy. The bimetal is formed by bonding a Ni--Co--Fe group low thermal expansion alloy, wherein a total amount of Ni and Co restricted to a very narrow containing range is within a specific composition range, a thermal expansion coefficient at 30 to 100.degree.C. is made similar to that of a 31 wt % Ni--5 wt % Co--Fe alloy of a nominal composition, a thermal expansion is very small and 2.times.10.sup.-6 /.degree.C. or less in the temperature range of 30.degree.to 300.degree. C., and further, a transition point is 250.degree. C. or higher and a transformation temperature is 50.degree. C. or less, and a high thermal expansion metal or alloy directly or via an intermediate metal or alloy whereby a stable and high precision thermal control can be realized in thermal control devices and the like, and it is possible to achieve the small-size, light and endurable devices, thus the bimetal can be used more widely.

REFERENCES:
patent: 1942261 (1934-01-01), Scott
patent: 2240824 (1941-05-01), Alban et al.
patent: 2332416 (1943-10-01), Waltenberg
patent: 3581366 (1971-06-01), Gottlieb et al.
patent: 3707359 (1972-12-01), Hanley
patent: 3767370 (1973-10-01), Ornstein
patent: 4115624 (1978-09-01), Izbicki
"Expansion Properties of Low-Expansion Fe-Ni-Co Alloys", Trans. AIME, V. 89, 1930, (Inst. of Metals Div.), pp. 508-536.

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