US4511410A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Copper-tin alloys having improved wear properties
Assignee: Olin Corp
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Filing: 1984-04-02
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Granted: 1985-04-16
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Expires: 2004-04-02
Abstract
Abstract A copper-tin alloy having improved wear performance and a process for forming the alloy is described herein. The alloy consists essentially of about 2% to about 11%, preferably about 3.5% to about 9% tin, about 0.03% to about 0.75%, preferably about 0.08% to about 0.5% phosphorous and the balance essentially copper. The processing for improving the wear performance includes a final heat treatment at a temperature in the range of about 400 DEG C. to about 650 DEG C., preferably about 500 DEG C. to about 600 DEG C. in an atmosphere having a dew point in the range of about -75 DEG C. to about +95 DEG C., preferably -57 DEG C. to +21 DEG C. and an oxygen level in the range of about 0.001 ppm to about 225 ppm.
Inventors
- 👤 Eugene Shapiro
- 👤 Frank N. Mandigo
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 15:54
CPC Classifications
C; C22; C22F; C22F1/00; C22F1/02; C22F1/08
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
106 words
A process for improving the wear performance of a copper-tin alloy, said process comprising: providing material formed from an alloy consisting essentially of about 2% to about 11% tin, about 0.03% to about 0.75% phosphorous and the balance essentially copper; and forming a lubricating type film on at least one surface of said material, said forming step comprising subjecting said material to a heat treatment at a temperature in the range of about 400° C. to about 650° C. in an atmosphere having a dew point in the range of about -75° C. to about +95° C. and an oxygen level less than about 300 ppm.
Claim 2
Dependent Claim
106 words
A process for improving the wear performance of a copper-tin alloy, said process comprising: providing material formed from an alloy consisting essentially of about 2% to about 11% tin, about 0.03% to about 0.75% phosphorous and the balance essentially copper; and forming a lubricating type film on at least one surface of said material, said forming step comprising subjecting said material to a heat treatment at a temperature in the range of about 400° C. to about 650° C. in an atmosphere having a dew point in the range of about -75° C. to about +95° C. and an oxygen level less than about 300 ppm.
Claim 3
Dependent Claim
65 words
The process of claim 1 wherein said heat treatment step comprises: subjecting said material to a heat treatment at a temperature in the range of about 500° C. to about 600° C. in an atmosphere having a dew point in the range of about -57° C. to about +21° C. and an oxygen level in the range of about 0.001 ppm to about 225 ppm.
Claim 4
Dependent Claim
22 words
The process of claim 1 further being characterized by: said wear performance being improved as said phosphorous content of said alloy increases.
Claim 5
Dependent Claim
22 words
The process of claim 1 further being characterized by: said wear performance being improved as said oxygen level of said atmosphere increases.
Claim 6
Dependent Claim
20 words
The process of claim 1 further being characterized by: said wear performance being improved as said heat treatment temperature increases.
Claim 7
Dependent Claim
26 words
The process of claim 1 further being characterized by: said wear performance being improved as said dew point of said atmosphere decreases and said temperature increases.
Claim 8
Dependent Claim
37 words
The process of claim 1 wherein said material providing step comprises: providing said material from an alloy consisting essentially of about 3.5% to about 9% tin, about 0.08% to about 0.5% phosphorous and the balance essentially copper.
Claim 9
Dependent Claim
27 words
The process of claim 1 wherein said lubricating type film forming step comprises: forming a plurality of discrete tin sweat nodules on said at least one surface.
Claim 10
Dependent Claim
28 words
The process of claim 1 wherein said lubricating type film forming step comprises: forming a thin layer of a tin-containing amorphous film on said at least one surface.
Claim 11
Dependent Claim
27 words
The process of claim 1 further comprising: cold working said material to a desired gage; and subjecting said material at said desired gage to said heat treatment.
Claim 12
Dependent Claim
16 words
The process of claim 10 further comprising: hot working said material prior to said cold working.
Claim 13
Dependent Claim
27 words
The process of claim 10 further comprising: casting said alloy into a continuous strip material; and said cold working step comprising cold rolling said cast strip material.
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) | 1988-04-15 | 1988-10-15 | 1989-04-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-04-15 | 1992-10-15 | 1993-04-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-04-15 | 1996-10-15 | 1997-04-16 | $7700.00 | Window Closed / Lapsed |