Embrittlement-resistant tantalum wire
AssigneeFansteel Inc.
InventorsHarold G. Marsh, James A. Pierret
Life of this patent
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Abstract
Tantalum and tantalum-rich alloys, particularly in wire form, are stabilized against embrittlement by the addition of 50 to 700 parts per million of silicon and optionally with the further addition of 100 to 500 parts per million of carbon.
Claims5
In a wrought tantalum product of, substantially pure tantalum containing less than 300 parts per million of columbium, less than 200 parts per million of iron, chromium and nickel combined, less than 50 parts per million of tungsten, less than 10 parts per million of molybdenum, less than 30 parts per million of chromium, and less than 20 parts per million of calcium, the improvement which comprises the inclusion of from about 50 to about 700 parts per million of silicon in the composition of said product whereby said product is improved in resistance to embrittlement when exposed to elevated temperatures in an oxygen-containing environment.
A tantalum wire composed of substantially pure tantalum containing less than 300 parts per million of columbium, less than 200 parts per million of iron, chromium and nickel combined, less than 50 parts per million of tungsten, less than 10 parts per million of moybdenum, less than 30 parts per million of chromium, and less than 20 parts per million of calcium, said metal containing from about 50 to about 700 parts per million of silicon.
Dependencies are inferred from the claim text.