Method of making internally oxidized dispersion hardened copper product
Abstract
Abstract A WROUGHT, DUCTILE, PRODUCT COMPRISING A COPPER MATRIX THROUGH WHICH PARTICLES OF A METAL OXIDE ARE INTIMATELY DISPERSED IS MADE BY INTERNALLY OXIDIZING AT A HIGH TEMPERATURE (PREFERABLY 1400*F. TO 1700*F.) AN ALLOY OF COPPER AND ONE OR MORE READILY OXIDIZED METALS HAVING OXIDES OF HIGH HEATS OF FORMATION. THE OXIDATION CONVERTS THE METAL ALLOYED WITH THE COPPER TO OXIDE AND SATURATES THE COPPER MATRIX WITH OXYGEN. THE OXIDIZED METAL IS HEATED (PREFERABLY AT 1400*F. TO 1700*.) IN HYDROGEN UNTIL THE OXYGEN DISSOLVED IN THE COPPER MATRIX (BUT NOT THE OXIDE OF THE METAL ALLOYED INITIALLY WITH THE COPPER) IS REDUCED, RESULTING IN SEVERE EMBRITTLEMENT OF THE METAL. THE RESULTING COPPER PRODUCT IS BROKEN UP MECHANICALLY TO GRANULAR FORM, AND THEN IS FORMED INTO AN EXTRUSION BILLET WHICH IS EXTRUDED HOT (AT SAY 1700* F. TO 1900*F.) INTO A DUCTILE, WORKABLE SHAPE OF SUITABLE CROSS SECTION. THE EXTRUDED SHAPE MAY BE COLD WORKED TO FINAL FORM.
Inventors
- 👤 Allen S Mcdonald Jr
Bibliographic Details
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-01-04 | 1974-07-06 | 1975-01-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-01-04 | 1978-07-06 | 1979-01-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-01-04 | 1982-07-06 | 1983-01-05 | $7700.00 | Window Closed / Lapsed |