Method for making thermostat metal

Claim 1

A method as set forth in claim 1 wherein said metal layers are heated to a temperature equaling from 0.5 to 0.7 of the absolute melting temperature of said selected iron or iron alloy layer.

Claim 3

A method for forming a composite metal comprising the steps of continuously advancing at least two elongated, thin strips of metal having clean surfaces thereon into interfacial contact, said strips embodying metals of relatively high and relatively low coefficients of thermal expansion respectively and at least one of said strips embodying a metal selected from the group consisting of iron and iron alloys having an oxide surface film on the contacted surface thereof, continuously roll squeezing said metal strips together as they are interfacially contacted at a temperature in the range from room temperature to about 1,000* F. with reduction in the thickness thereof for breaking said oxide film apart and for forming a partial metallurgical bond between said metal strips in the solid phase, and heating said metal strips to a temperature below the melting temperatures thereof for substantially completely dispersing oxides from said interfacially contacted surface of said iron or iron alloy strip into said metal strip and for inducing diffusion in the metal strips to substantially completely bond said interfacially contacted surfaces of said metal strips together in the solid phase.

Claim 9

A method for forming a composite thermostat metal comprising the steps of cleaning the principal surfaces of at least two elongated, thin metal strips for removing gross contaminants therefrom, said strips embodying metal materials of relatively high and relatively low coefficients of thermal expansion respectively and at least one of said metal strips comprising a material selected fRom the group of materials having nominal compositions by weight, consisting of an alloy of 0.5% carbon, 22.0% nickel, 3.0% chromium and the balance iron; an alloy of 19.4% nickel, 2.25% chromium and the balance iron; an alloy of 5.1% aluminum, 9.5% manganese, 14.65% nickel and the balance iron; an alloy of 8.5% chromium, 25.0% nickel and the balance iron; an alloy of 11.5% chromium, 18% nickel and the balance iron; an alloy of 3.0% molybdenum, 10.0% chromium, 18.0% nickel and the balance iron; an alloy of 7.0% chromium, 19.0% nickel and the balance iron; an alloy of 0.5% carbon, 5.0% manganese, 14.0% nickel and the balance iron; an alloy of 4.0% manganese, 25.0% nickel and the balance iron; an alloy of 8.0% nickel, 18.0% chromium and the balance iron; an alloy of 1.0% cobalt, 1.0% molybdenum, 32.0% nickel and the balance iron; an alloy of 4.5% aluminum, 16.5% chromium, and the balance iron; an alloy of 36.0% nickel and the balance iron; an alloy of 38.5% nickel and the balance iron; an alloy of 8.0% cobalt, 8.0% chromium, 31.0% nickel and the balance iron; an alloy of 1.0% molybdenum, 15.0% cobalt, 32.0% nickel and the balance iron; an alloy of 7.0% chromium, 38.0% nickel and the balance iron; an alloy of 40.0% nickel and the balance iron; an alloy of 42.0% nickel and the balance iron; an alloy of 45.0% nickel and the balance iron; an alloy of 50.0% nickel and the balance iron; and an alloy of 17.0% chromium and the balance iron, said iron or iron alloy strip having an oxide surface film on said cleaned surfaces thereof, continuously advancing said cleaned metal strips into contact with each other for interfacially contacting cleaned surfaces of said strips continuously roll squeezing said metal strips together as they are interfacially contacted at a temperature in the range from room temperature to about 1,000* F. with reduction in the thickness of each of said metal strips for breaking said oxide film apart and for forming a partial metallurgical bond between said metal strips in the solid phase, and heating said metal strips to a temperature in the range from 0.5 to 0.7 of the absolute melting temperature of said iron or iron alloy strip for dispersing oxides from said interfacially contacted surface of said iron or iron alloy strip into said metal strip and for inducing diffusion in the metal strips to substantially completely bond said interfacially contacting surfaces of said metal strips together in the solid phase, said temperature being below the melting temperature of all of said metal strips.