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Patent US4155754A successfully refreshed from Google Patents.
US4155754A
Expired / Lapsed
US
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Method of producing high density iron-base material
Assignee: Amsted Industries Inc
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Filing: 1977-10-31
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Granted: 1979-05-22
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Expires: 1997-10-31
Abstract
Abstract A method of producing a high density iron-base material by a powdered metal process includes blending powder of a substantially eutectic alloy with carbon particles to increase the difference between the solidus and liquidus temperatures of the blend. The blend is then compacted and sintered at a temperature between the solidus and liquidus temperatures to achieve the desired high density.
Inventors
- 👤 Jean C. Lynn
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 09:02
CPC Classifications
C; C22; C22C; C22C33/00; C22C33/02; C22C33/0207; C22C33/0257; C22C33/0278; C22C33/0285
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
184 words
A method of producing a high carbon, heat and abrasion resistant and high density, iron-base alloy having a final composition which includes at least 1% of one of the elements of the group consisting of chromium, vanadium, molybdenum and tungsten, said method comprising the steps of: atomizing a melt having an initial carbon content of less than 0.2% for forming a cold compactible powder of an iron-base alloy, blending a quantity of carbon particles with said powder to increase the carbon content sufficiently so as to create a blend of powdered metal having a carbon content greater than the carbon content found at the eutectic point of said iron-base alloy so as to provide a greater difference between the solidus and liquidus temperatures than the difference normally present in a eutectic iron-base alloy, compressing said blend into a compacted blank in a die at a pressure in excess of 2800 kg/cm 2 , removing said compacted blank from said die and then sintering said compacted blank at a temperature between the solidus and liquidus temperatures of said blend to provide a high density material.
Claim 2
Independent Claim
184 words
A method of producing a high carbon, heat and abrasion resistant and high density, iron-base alloy having a final composition which includes at least 1% of one of the elements of the group consisting of chromium, vanadium, molybdenum and tungsten, said method comprising the steps of: atomizing a melt having an initial carbon content of less than 0.2% for forming a cold compactible powder of an iron-base alloy, blending a quantity of carbon particles with said powder to increase the carbon content sufficiently so as to create a blend of powdered metal having a carbon content greater than the carbon content found at the eutectic point of said iron-base alloy so as to provide a greater difference between the solidus and liquidus temperatures than the difference normally present in a eutectic iron-base alloy, compressing said blend into a compacted blank in a die at a pressure in excess of 2800 kg/cm 2 , removing said compacted blank from said die and then sintering said compacted blank at a temperature between the solidus and liquidus temperatures of said blend to provide a high density material.
Claim 3
Dependent Claim
54 words
The method of claim 1 wherein said cold compactible powder has a composition which comprises the following analysis: ______________________________________
Chromium About 17%
Molybdenum About 16%
Cobalt About 6%
Carbon About 0.2% maximum
Vanadium About 1.9%
Silicon About 1.5% maximum
Manganese About 1% maximum
Nickel About 0%
Others About 3% maximum
Iron Essentially balance.
______________________________________
Claim 4
Dependent Claim
19 words
The method of claim 1 wherein said carbon particles comprise about 3.8% to 4.8% of said blend by weight.
Claim 5
Dependent Claim
30 words
The method of claim 1 wherein said carbon particles comprise about 3.8% of said blend by weight and said sintering is performed at about 1165° C. for about two hours.
Claim 6
Dependent Claim
16 words
The method as described in claim 1 wherein said sintering is performed in a near vacuum.
References Cited (Backward Citations)
US3937630A
Cited
US3859085A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1982-05-21 | 1982-11-20 | 1983-05-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-05-21 | 1986-11-20 | 1987-05-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-05-21 | 1990-11-20 | 1991-05-22 | $7700.00 | Window Closed / Lapsed |