Corrosion resistant thermostat metal compositions

Details Corrosion resistant thermostat metal compositions Corrosion resistant thermostat metal compositions

1980-11-14

1982-12-28

Lewis, Michael L.

Stock material or miscellaneous articles

All metal or with adjacent metals

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

428682, 428685, 428925, B32B 1501, B32B 1518

Patent

active

043662102

ABSTRACT:
Thermostat metals combining properties of relatively high flexivity and good corrosion resistance are prepared by metalurgically bonding a corrosion resistant high expansive alloy (1) to a less corrosion resistant low expansive alloy (2) and capping the low expansive alloy (2) with a corrosion resistant, moderately low expansive alloy (3) of similar hardness to that of the low expansive alloy (2).
The preferred high expansive alloy (1) is comprised of about 18 wt. % Ni; 11 wt. % Cr; and balance Fe.
The preferred low expansive alloy (2) is Invar (36 wt. % Ni; balance Fe).
The preferred corrosion resistant low expansive alloy (3) is comprised of about 20 wt. % Ni; 26 wt. % Co; 7 wt. % Cr; balance Fe.
The preferred volumetric ratios of the metals is about 50% of the high expansive alloy (1), 30 to 40% of the low expansive metal (2) and 10 to 20% of the corrosion resistant low expansive alloy.

REFERENCES:
patent: 1769622 (1930-07-01), Chace
patent: 1993020 (1935-03-01), Scott

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