US2944893A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for producing tool steels containing titanium carbide
Assignee: SinterCast Corp of America
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Filing: 1956-12-26
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Granted: 1960-07-12
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Expires: 1976-12-26
Abstract
No abstract record available.
Inventors
- 👤 Peter J Koenig
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 00:26
CPC Classifications
C; C22; C22C; C22C33/00; C22C33/04
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
195 words
A METHOD FOR PRODUCING BY INFILTRATION A HEAT TREATABLE TITANIUM TOOL STEEL OF SUBSTANTIALLY UNIFORM COMPOSITION FROM TITANIUM CARBIDE POWDER HAVING A REACTABLE CARBON CONTENT DETERMINED AS THE SUM OF THE FREE CARBON CONTAINED IN SAID TITANIUM CARBIDE AND THE CARBON RESULTING FROM THE DECOMPOSITION OF SAID TITANIUM CARBIDE DURING SUBSEQUENT HEATING WHICH COMPRISES, MIXING WITH SAID TITANIUM CARBIDE POWDER AN AMOUNT OF IRON OXIDE POWDER SUBSTANTIALLY STOICHIOMETRICALLY PROPORTIONED TO THE SAID REACTABLE CARBON CONTENT, THE STOICHIOMETRIC REACTION BEING BASED ON THE FORMATION OF CARBON MONOXIDE, FORMING A POROUS COMPACT OF SAID POWDER MIXTURE, SUBJECTING SAID POROUS COMPACT TO HEATING AT AN ELEVATED TEMPERATURE UP TO ABOUT 1250*C. AT SUB-ATMOSPHERIC PRESSURE TO EFFECT REACTION BETWEEN THE SAID REACTABLE CARBON AND THE IRON OXIDE, MAINTAINING SAID POROUS COMPACT UNDER SAID SUB-ATMOSPHERIC PRESSURE UNTIL SUBSTANTIALLY ALL THE GASEOUS PRODUCTS HAVE BEEN REMOVED, RAISING THE TEMPERATURE TO ABOVE 1250*C. TO STRENGTHEN THE SKELETON AND THEN SUBJECTING SAID TREATED SKELETON TO INFILTRATION WITH A STEEL INFILTRANT AT SUB-ATMOSPHERIC PRESSURE, WHEREBY A TITANIUM TOOL STEEL IS OBTAINED CHARACTERIZED BY A MICROSTRUCTURE OF TITANIUM CARBIDE GRAINS DISTRIBUTED THROUGH A HEAT TREATABLE STEEL MATRIX, SAID MATRIX BEING SUBSTANTIALLY FREE FROM PRIMARY CEMENTITE.
Claim 2
Independent Claim
195 words
A METHOD FOR PRODUCING BY INFILTRATION A HEAT TREATABLE TITANIUM TOOL STEEL OF SUBSTANTIALLY UNIFORM COMPOSITION FROM TITANIUM CARBIDE POWDER HAVING A REACTABLE CARBON CONTENT DETERMINED AS THE SUM OF THE FREE CARBON CONTAINED IN SAID TITANIUM CARBIDE AND THE CARBON RESULTING FROM THE DECOMPOSITION OF SAID TITANIUM CARBIDE DURING SUBSEQUENT HEATING WHICH COMPRISES, MIXING WITH SAID TITANIUM CARBIDE POWDER AN AMOUNT OF IRON OXIDE POWDER SUBSTANTIALLY STOICHIOMETRICALLY PROPORTIONED TO THE SAID REACTABLE CARBON CONTENT, THE STOICHIOMETRIC REACTION BEING BASED ON THE FORMATION OF CARBON MONOXIDE, FORMING A POROUS COMPACT OF SAID POWDER MIXTURE, SUBJECTING SAID POROUS COMPACT TO HEATING AT AN ELEVATED TEMPERATURE UP TO ABOUT 1250*C. AT SUB-ATMOSPHERIC PRESSURE TO EFFECT REACTION BETWEEN THE SAID REACTABLE CARBON AND THE IRON OXIDE, MAINTAINING SAID POROUS COMPACT UNDER SAID SUB-ATMOSPHERIC PRESSURE UNTIL SUBSTANTIALLY ALL THE GASEOUS PRODUCTS HAVE BEEN REMOVED, RAISING THE TEMPERATURE TO ABOVE 1250*C. TO STRENGTHEN THE SKELETON AND THEN SUBJECTING SAID TREATED SKELETON TO INFILTRATION WITH A STEEL INFILTRANT AT SUB-ATMOSPHERIC PRESSURE, WHEREBY A TITANIUM TOOL STEEL IS OBTAINED CHARACTERIZED BY A MICROSTRUCTURE OF TITANIUM CARBIDE GRAINS DISTRIBUTED THROUGH A HEAT TREATABLE STEEL MATRIX, SAID MATRIX BEING SUBSTANTIALLY FREE FROM PRIMARY CEMENTITE.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-07-12 | 1964-01-11 | 1964-07-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-07-12 | 1968-01-11 | 1968-07-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-07-12 | 1972-01-11 | 1972-07-12 | $7700.00 | Window Closed / Lapsed |