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US 5,308,379 AGranted
Extra-low-oxygen copper and a method of processing same
AssigneeMitsubishi Materials Corporation
InventorsNorikazu Ishida, Takurou Iwamura
Life of this patent
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Abstract
Copper oxide is added to molten copper to produce an extra-low-oxygen copper having an oxygen concentration of at most 0.5 ppm. In some embodiments, the copper oxide is added as a powder introduced into the melt with a blowing gas. In other embodiments, the molten copper is in contact with graphite during deoxidation and the addition of copper oxide.
Claims18
A method of processing copper comprising:
- deoxidizing a molten copper;
- adding a Cu.sub.x O to said molten copper to produce a mixture;
- said Cu.sub.x O producing an oxygen concentration within a range of from 50 to 200 ppm relative to said molten copper for a portion of said deoxidizing;
- and
- maintaining said mixture at a predetermined melting temperature for a predetermined time.
2 more elements
A method of processing copper comprising:
- melting a copper raw material into a molten copper;
- deoxidizing said copper raw material;
- and
- the step of deoxidizing including creating an oxygen concentration within a range of from 50 to 200 ppm relative to said molten copper during a portion of said deoxidizing.
1 more element
A method of processing copper comprising:
- melting a copper raw material to produce a molten copper;
- deoxidizing said molten copper;
- maintaining said molten copper in a molten state in contact with graphite, during said deoxidizing:
- and
- adding a Cu.sub.x O in an amount sufficient to achieve an oxygen concentration within a range of from 50 to 200 ppm, relative to said molten copper, during a portion of said deoxidizing.
2 more elements
A method of processing copper comprising:
- melting a copper raw material while contacing said copper raw material with graphite to produce a molten copper;
- deoxidizing said molten copper;
- maintaining said molten copper in a molten state in contact with graphite, during said deoxidizing;
- blowing one of an inert gas and a reducing gas into said molten copper, during said deoxidizing;
- blowing a Cu.sub.x O into said multen copper with said one of an inert gas and a reducing gas;
- and
- the step of blowing a Cu.sub.x O including blowing an amount of said Cu.sub.x O sufficient to produce an oxygen concentration within a range of from 50 to 200 ppm, relative to said molten copper, for a portion of said deoxidizing.
4 more elements
A method of manufacturing extra-low-oxygen copper comprising:
- melting a copper raw material while contacting said copper raw material with graphite to produce a molten copper;
- deoxidizing said molten copper;
- maintaining said molten copper in a molten state in contact with graphite, during said deoxidizing;
- blowing one of an inert gas and a reducing gas into said molten copper, during said deoxidizing, as soon as said molten copper reaches 1200.degree. C.;
- blowing a Cu.sub.x O into said molten copper with said one of an inert gas and a reducing gas;
- and
- the step of blowing a Cu.sub.x O including blowing an amount of said Cu.sub.x O sufficient to produce an oxygen concentration within a range of from 50 to 200 ppm, relative to said molten copper, for a portion of said deoxidizing.
4 more elements
Dependencies are inferred from the claim text.