US3595705A - Copper-boron-sulfur alloy and method of treatment - Google Patents
Copper-boron-sulfur alloy and method of treatment Download PDFInfo
- Publication number
- US3595705A US3595705A US832977A US3595705DA US3595705A US 3595705 A US3595705 A US 3595705A US 832977 A US832977 A US 832977A US 3595705D A US3595705D A US 3595705DA US 3595705 A US3595705 A US 3595705A
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- alloy
- copper
- boron
- sulfur
- temperature
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B1/00—Conductors or conductive bodies characterised by the conductive materials; Selection of materials as conductors
- H01B1/02—Conductors or conductive bodies characterised by the conductive materials; Selection of materials as conductors mainly consisting of metals or alloys
- H01B1/026—Alloys based on copper
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22F—CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
- C22F1/00—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
- C22F1/08—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of copper or alloys based thereon
Definitions
- This invention relates to a copper boron sulfur alloy and to a method of treating the alloy to produce an alloy having a high softening temperature 'with high electrical conductivity.
- the alloy is further characterized by the property that after cold working it can be temper annealed to produce intermediate tempers.
- Typical commercial copper will retain full hardness if heated to 175 C. but becomes fully soft if heated to 250 C.
- Cadmium copper for instance which after a high degree of rolling has a tensile strength of 68,000 p.s.i., will become soft at 400 C. after minutes but the electrical conductivity of these alloys drop far below the high conductivity value of 100 percent IACS.
- This invention is based on the discovery that the addition of minor amounts of boron and sulfur in a copper' alloy gives an alloy which can be treated to improve the softening temperature to above 450 C. While retaining the high conductivity characteristics of copper. It is further characterized ⁇ by the property that cold worked Inaterial can be temper annealed to intermediate tempers.
- the invention relates to a copper base alloy containing from .004 to .03 percent by weight boron and .002 to .01 percent by weight sulfur.
- the solution treated and cold worked alloy is further characterized by having a softening temperature above about 450 C.
- This material has an electrical conductivity of about 100 percent IACS.
- the invention further relates to a method of imparting a high softening temperature to this alloy which involves solution annealing the alloy and rapidly cooling to room temperature and then cold rolling.
- the solution annealing mee is preferably carried out between a temperature range of 900 C. and about 1040" C. and. the material is rapidly quenched to room temperature in a period of less than 20 seconds.
- This invention is further characterized by the property that the solution annealed and cold Worked alloy can be temper annealed -by heating the alloy to temperatures below its softening temperature.
- softening temperature used herein is meant the lowest annealing temperature which will cause a significant drop in hardness and tensile strength, as opposed to the gradual decrease with temperature and time, which results from changes due to metallurgical reactions such as recovery.
- FIG. 1 is a three-dimensional chart showing the effect of temperature and time on the tensile strength of a boron sulfur copper alloy treated in accordance with the present invention.
- FIG. 2 is a three-dimensional chart showing the eifect of temperature and time on the yield strength of a -boron sulfur copper alloy treated in accordance with the present invention,
- the solution annealing temperature for both FIGS. 1 and 2 was approximately 975 C.
- FIG. 3 is a three-dimentional chart showing the effect of temperature and time on the tensile strength of a prior art cadmium copper alloy.
- FIG. 4 is a three-dimensional chart showing the effect of temperature on the yield strength of prior art cadmium copper alloy.
- FIG. 5 is a three-dimensional chart showing the effect of time and temperature on the tensile strength of a prior art silver bearing copper alloy.
- FIG. 6 is a three-dimensional chart showing the effect of time and temperature on the yield strength of a prior art silver bearing copper alloy. All alloys described in FIGS. l-6 were cold rolled in excess of 90%.
- FIG. 7 is a graph showing the differing effects on the tensile strength of boron sulfur copper alloys when reheated or annealed to temperatures up to about 700 C. for alloys which have previously been solution annealed at various temperatures, quenched and cold worked. The eifect of these variables on a copper alloy (CDA 109) initially treated at 975 C. but not having both boron and sulfur within the ranges of the invention is also shown, and
- FIG. 8 is a graph showing the differing effects on the yield strength of boron sulfur copper alloys when reheated or annealed to temepratures up to about 700 C. for alloys which have previously been solution annealed at various temperatures, quenched .and cold worked. The effect of these variables on a copper alloy (CDA 109) initially treated at 975 C. but not having both boron and sulfur Within the ranges of the invention is also shown.
- a boron copper sulfur alloy of the invention contained the following percentages by weight: .009 boron, .0026 sulfur and two impurities of less than .002 iron and .002 silicon.
- a .650 inch section of this alloy was solution annealed for one hour at 900 C. in an argon hydrogen atmosphere and immediately water quenched to Water temperature. The section was then cold rolled to .065 inch (90 percent cold reduction).
- Tensile specimens were machined from the strip and'annealed in-a salt bath at approximately 400 C., 450 C. and 500 C. for three, six and twelve minutes.
- a coil of 0.60 inch strip having a boron copper sulfur alloy composition of .009 percent by weight boron and .0021 percent by weight sulfur, plus normal impurities and the balance copper was annealed in a strand annealer in a cracked ammonia atmosphere for 7 minutes by passing the strand through a 15 foot hot zone at 925 C. at 2 feet per minute. The strand was quenched in Water and cold rolled to .006 inch. Upon exposure to 450 C. for 1/2 hour, there was no appreciable softening of the alloy.
- Data compiled from controlled tests of copper bearing alloy samples having boron and sulfur in the ranges of the invention shows that the range in which the alloy should be solution annealed to obtain the high softening temperature is above about 800 C. Solution annealing in the range of about 900 C. to 1040 C. for l0 minutes in preferred. Treatment at temperatures above 1000 C. does not increase the softening temperature appreciably.
- the following table shows the temperatures and times at which alloy specimens were heat treated and the softening characteristics of the alloy after reheating the alloy to various annealing temperatures. All the specimens tested included boron and sulfur in the ranges of the invention except the last listed alloy which was initially treated at 975 C.
- the other boron sulfur alloy specimens have softening temperatures above 450 C. when heat treated at 800 C., 850 C., 900 C., 950 C., and 1000 C. Quenching of the alloy in less than 20 seconds is preferred.
- the copper boron sulfur alloys of the present invention will retain some of their strength even at very high temperatures if the alloy has been solution annealed in the range of 950 C.-1025 C. quenched and moderately cold worked. For example, an alloy in this condition will retain some of its strength when heated to about 815 C. for 1 to 5 minutes.
- a Wire composed of an alloy in such condition which has a yield strength of 21.7K s.i. after 5 minutes at 805 C. Conventional coppers would show a yield strength of about 10K s.i. after such reheating.
- the conductivity values were all very close to 100 percent IACS and thus in all instances produced a high conductivity alloy.
- the commercially produced copper boron sulfur alloy of the invention which had a tensile strength of ⁇ 65,000 p.s.i., as rolled, produced a tensile strength of 57,000 p.s.i. after 15 minutes at 400 C.; 47,000 p.s.i. after 15 minutes at 450 C.; and 54,000 p.s.i. after l hour at 400 C.; and 39,000 p.s.i. after 1 hour at 450 C.
- This property of a gradual falling olf of the properties at a given temperature permits temper annealing.
- the tensile and yield strengths of the alloy of the present invention charted in FIGS. l and 2 are respectively greater at every value for temperature and time than the tensile and yield strength f the cadmium copper alloy charted in FIGS. 3 and 4 and also greater than the tensile and yield strengths of the silver bearing copper alloy charted in FIGS. 5 and 6.
- FIG. 1 illustrates what is meant by a gradual falling ol of properties by three-dimensional depiction there of the present alloys tensile strength slope as affected by temperature and time.
- the more acute slopes of the prior art alloys depicted in FIGS. 3-6 graphically demonstrate the improvement achieved with the present alloy.
- a method of imparting high softening temperatures to a copper alloy comprising providing in the alloy .004 to 0.3 percent by weight boron and .002 to .01 percent by weight sulfur, solution annealing the alloy at a temperature in the range of about 800 C. to about 1040 C. and maintaining it in that temperature range for a period of time, rapidly quenching the alloy from said annealing 6 temperature to about room temperature and subsequently cold working the alloy.
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Abstract
Description
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US83297769A | 1969-06-13 | 1969-06-13 |
Publications (1)
Publication Number | Publication Date |
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US3595705A true US3595705A (en) | 1971-07-27 |
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US832977A Expired - Lifetime US3595705A (en) | 1969-06-13 | 1969-06-13 | Copper-boron-sulfur alloy and method of treatment |
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Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4118256A (en) * | 1976-05-11 | 1978-10-03 | Electroschmelzwerk Kempten Gmbh | Process for the production of oxygen-free copper casting and moldings |
-
1969
- 1969-06-13 US US832977A patent/US3595705A/en not_active Expired - Lifetime
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4118256A (en) * | 1976-05-11 | 1978-10-03 | Electroschmelzwerk Kempten Gmbh | Process for the production of oxygen-free copper casting and moldings |
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