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US 5,022,935 AGranted
Deoxidation of a refractory metal
AssigneeRMI Titanium Company
InventorRichard L. Fisher
Life of this patent
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Abstract
A process for the deoxidation of a refractory metal containing minor concentrations of oxygen is disclosed. In this process the refractory metal is contacted with a metallic deoxidant in a dry, inert atmosphere. The metallic deoxidant and the refractory metal are heated to at least liquefy the metallic deoxidant and at least partially deoxidize the refractory metal. The refractory metal is thereafter cooled and contaminants on its surface are removed.
Claims46
A process for the deoxidation of an oxidized refractory metal comprising:
- contacting a refractory metal containing oxygen in minor concentration with a metallic deoxidant in a dry inert atmosphere;
- heating said contacted refractory metal and metallic mixture to at least liquefy said metal mixture and at least partially deoxidize said refractory metal;
- cooling said liquified metallic deoxidant and said deoxidized refractory metal;
- and
- removing contaminants from the surface of said deoxidized refractory metal.
2 more elements
A process for the deoxidation of titanium comprising:
- (a) contacting titanium, selected from the group consisting of neat titanium and a titanium-containing alloy, said titanium containing up to about 1% by weight oxygen, based on the total weight of said titanium, with a metal metallic mixture, said metal mixture comprising a deoxidant metal selected from the group consisting of calcium, barium and strontium and a mixture of a deoxidant metal selected from the group consisting of calcium, barium, and strontium, and a metal and a carrier metal selected from the group consisting of sodium, lithium, potassium, magnesium, and zinc in an inert dry atmosphere;
- (b) heating said titanium and said metallic mixture to a temperature in the range of between about 700.degree. C. and about 1200.degree. C. for about 1 to about 12 hours;
- (c) cooling said heated titanium and said metallic mixture to ambient temperature;
- and
- (d) removing contaminants from the surface of said cooled titanium.
2 more elements
A process for deoxidation of titanium comprising:
- a) contacting titanium, selected from the group consisting of titanium metal and titanium-containing alloys, having a thickness of less than 0.1875 inch, with calcium metal in a dry inert atmosphere retort;
- b) heating said retort to a temperature in the range of between about 900.degree. C. and about 1000.degree. C. at a pressure of between about 0.25 psig and about 10 psig;
- c) cooling said retort to ambient temperature;
- d) leaching said titanium with a dilute acid selected from the group consisting of hydrochloric acid, nitric acid and acetic acid.
1 more element
Dependencies are inferred from the claim text.