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Publication numberUS3636242 A
Publication typeGrant
Publication dateJan 18, 1972
Filing dateNov 24, 1969
Priority dateDec 9, 1968
Also published asDE1961694A1, DE1961694B2
Publication numberUS 3636242 A, US 3636242A, US-A-3636242, US3636242 A, US3636242A
InventorsHans Olof Hansson
Original AssigneeEricsson Telefon Ab L M
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
An electric conductor wire
US 3636242 A
Abstract
An electric conductor wire of aluminum or aluminum alloy with a diameter less than 5 mm., is covered with a layer containing nickel with a thickness in the range of from 0.1 to 10 mu . In order to improve the adhesiveness of the layer, the layer consists of an alloy of nickel and zinc with a proportion of zinc up to 75 percent.
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Description  (OCR text may contain errors)

United States Patent Hansson 1 Jan. 18, 1972 [54] AN ELECTRIC CONDUCTOR WIRE [72] Inventor: I-Ians Olof Hansson, Sollentuna, Sweden [73] Assignee: Telefonaktlebolaget LM Ericsson,

Stockholm, Sweden [22] Filed: Nov. 24, I969 [211 App]. No.: 879,567

[30] Foreign Application Priority Data Dec. 9, 1968 Sweden 16795/68 May 27, 1969 Sweden 7440/69 [52] U.S.CI ..l74/128, 29/19I.6, 29/197, 174/ 1 26 CP [5 l Int. Cl. ..H0lb 5/08 [58] Field ofSearch ..174/l26, 126.2,128, 94, 126 R,

[56] References Cited UNITED STATES PATENTS 2,233,410 4/1941 Frasch ..29/l91.6

2,427,727 9/1947 Huntley 1 74/94 3,254,970 6/1966 Dittrich ..29/ l 9 I .6 3,367,796 2/1968 Saums 17411262 UX FOREIGN PATENTS OR APPLICATIONS 217,784 10/1958 Australia l74/126.2

OTHER PUBLICATIONS Dummer et al. Wires and R. F. Cables 1968 Pitman London pp. 21 table 36 Primary Examiner-E. A. Goldberg Attorney-Hane & Baxley [5 7] ABSTRACT An electric conductor wire of aluminum or aluminum alloy with a diameter less than 5 mm., is covered with a layer containing nickel with a thickness in the range of from 0.1 to 10 11.. In order to improve the adhesiveness of the layer, the layer consists of an alloy of nickel and zinc with a proportion of zinc up to 75 percent.

7 Claims, 2 Drawing Figures PATENTEDJANIBWYZ 3,636,242

INVENTOR. HANS 0L 0F HANSSON A 1- TOENE rs ELECTRIC CONDUCTOR WIRE This invention relates to an electric wire conductor, mainly comprising aluminum, with a diameter less than 5 mm.

Owing to the rising price of copper the latter metal has been replaced by aluminum or aluminum alloy in electrical cables.

In order to clamp-connect conductors of aluminum, it demands special expensive measures dependent on the tendency of the latter metal to oxidize. The occurrence of contact resistance can be so large due to the oxide layer that temperatures entailing the risk of fire were observed in the clamp-connections.

The use of aluminum conductors according to the presentinvention is made possible by providing the conductor on the surface with a layer containing nickel with a thickness in the range of from 0.1 to

Improved adhesiveness or bonding of the layer on the conductor is obtained according to the invention when the applied layer consists of an alloy of nickel and zinc with a proportion of zinc in the range of from 25 percent to 75 percent. Good results are obtained when the alloy consists of zinc in the range of from 40 percent to 60 percent and it is particularly suitable to have an admixture of zinc in the range of from 45 percent to 55 percent. With nickel and zinc are here meant the respective metals of commercial grade, that is, impurities may be present to some extent.

The layer is applied by means of an electrochemical method known per se for example the fluoborate method.

The aluminum conductor in this manner provided with a layer according to the invention can be readily soldered with usual tin solder and resin fluxing material.

The manufacture may be started with a wire of substantially the desired final diameter, which is to be covered with a layer according to the invention, or the manufacture may be started with a thicker diameter, which is covered with a layer according to the invention and then is drawn to a desired thinner diameter.

The invention also includes twisted, multiwire cores where each single wire line is provided with a layer according to the invention. The layer hereby reduces the mutual resistance between the individual wires which is of great importance in order to obtain good contact at the connection of a wire at a connection point.

For wire armoring of electrical cables it can, for example for submarine cable, be suitable to use aluminum wires covered with a layer according to the invention. Such a wire armoring becomes light and resistant to corrosion.

A conductor with a layer according to the invention has qualities similar to those of a copper conductor and can be insulated with all usual insulating means, for example paper, plastics or oil.

in the accompanying drawing, several preferred embodiments of the invention are shown by way of illustration and not by way of limitation.

In the drawing:

FIG. 1 is a cross section of an electric wire conductor according to the invention; and

FIG. 2 is a cross section of a cable formed by wire conductors according to the invention.

Referring now to the figures more in detail, FIG. 1 shows an electric wire conductor 1 having a solid core wire 2 made of aluminum or an aluminum alloy and sheathed by a layer 3 of nickel or any of the alloys as set forth in the specification.

As also set forth in the specification, the maximal diameter of the core is less than 5 mm. and the thickness of the layer 3 is between 0.1 to lOu.

The cable of FIG. 2 is formed by twisting a plurality of wire conductors l as described in connection with FIG. 1. The wires are twisted so that they substantially contact each other. The aforedescribed surface layer 3 of the wire conductors reduces the resistance between the individual wires in contact with each other. As a result, high-quality connections between the cable and a connecting point such as a connector can be conveniently and safely made.

I claim: 1. An electric wire conductor consisting a one-piece core wire of aluminum or aluminum alloy having a diameter of less than 5 mm., and an outer layer containing nickel encompassing said core wire bonded thereto, said outer layer having a thickness of O. l to 10 microns.

2. The electric wire conductor according to claim 1 wherein 7 said outer layer consists of nickel except for impurities.

3. The electric wire conductor according to claim 1 wherein said outer layer consists of an alloy of nickel and zinc with at least 25 percent nickel and a balance of zinc except for impurities.

4. The electric wire conductor according to claim 1 wherein said outer layer consists of zinc in therange of 25 to percent, the balance being nickel except for impurities.

5. The electric wire conductor according to claim 4 wherein the zinc content of the outer layer is in the range of 40 to 60 percent.

6. The electric wire conductor according to claim 4 wherein the zinc content of the outer layer is in the range of 45 to 55 percent.

7. An electric cable comprising a plurality of twisted wire conductors, each of said wire conductors comprising a onepiece core wore of aluminum or aluminum alloy having a diameter of less than 5 mm., and an outer layer containing nickel encompassing said core wire bonded thereto, said outer layer having a thickness of 0.1 to 5 microns.

Patent Citations
Cited PatentFiling datePublication dateApplicantTitle
US2233410 *Jun 28, 1937Mar 4, 1941Produits Chim Terres Rares SocProcess for direct nickel-plating of aluminum and its alloys
US2427727 *Sep 24, 1943Sep 23, 1947Gen ElectricLeading-in wire
US3254970 *Aug 16, 1961Jun 7, 1966Metco IncFlame spray clad powder composed of a refractory material and nickel or cobalt
US3367796 *Jul 13, 1966Feb 6, 1968Anaconda Wire & Cable CoPyrolizable enamel coated wire comprising manganese and cobalt chelates
AU217784A * Title not available
Non-Patent Citations
Reference
1 *Dummer et al. Wires and R. F. Cables 1968 Pitman London pp. 21 table 36
Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US3810287 *Jun 9, 1972May 14, 1974Olin CorpComposite rod or wire
US3909209 *Nov 5, 1973Sep 30, 1975Gould IncMethod of treating aluminum and aluminum alloys and article produced thereby
US4728080 *Dec 20, 1984Mar 1, 1988Bay Mills LimitedElectric fence wire construction
US5443905 *Jan 24, 1994Aug 22, 1995Sumitomo Electric Industries, Ltd.Heat and oxidation resistant composite electrical conductor
US5477610 *Mar 18, 1994Dec 26, 1995Sumitomo Electric Industries, Ltd.Method of manufacturing composite conductor having heat resistance or oxidation resistance
US5994152 *Jan 24, 1997Nov 30, 1999Formfactor, Inc.Fabricating interconnects and tips using sacrificial substrates
US7491890Feb 8, 2006Feb 17, 2009NexansElectric wire having a core of aluminum or aluminum alloy
US7601039Jul 11, 2006Oct 13, 2009Formfactor, Inc.Microelectronic contact structure and method of making same
US8033838Oct 11, 2011Formfactor, Inc.Microelectronic contact structure
US8373428Aug 4, 2009Feb 12, 2013Formfactor, Inc.Probe card assembly and kit, and methods of making same
US20020053734 *Dec 27, 2001May 9, 2002Formfactor, Inc.Probe card assembly and kit, and methods of making same
US20060237856 *Jul 11, 2006Oct 26, 2006Formfactor, Inc.Microelectronic Contact Structure And Method Of Making Same
US20060283622 *Feb 8, 2006Dec 21, 2006Francis DebladisElectric wire having a core of aluminum or aluminum alloy
US20060286828 *Aug 1, 2006Dec 21, 2006Formfactor, Inc.Contact Structures Comprising A Core Structure And An Overcoat
US20090291573 *Aug 4, 2009Nov 26, 2009Formfactor, Inc.Probe card assembly and kit, and methods of making same
US20100093229 *Oct 12, 2009Apr 15, 2010Formfactor, Inc.Microelectronic contact structure and method of making same
US20120146204 *Nov 14, 2011Jun 14, 2012Fairchild Semiconductor CorporationSemiconductor devices and electrical parts manufacturing using metal coated wires
US20140138366 *Nov 11, 2013May 22, 2014GM Global Technology Operations LLCSelf-adjusting wire for welding applications
EP1700933A1 *Feb 3, 2006Sep 13, 2006NexansElectrical lead wire with aluminium or aluminium alloy core
WO1996037931A1 *May 28, 1996Nov 28, 1996Formfactor, Inc.Spring element electrical contact and methods
Classifications
U.S. Classification174/128.1, 428/592, 174/126.2, 428/652, 428/926, 428/680
International ClassificationH01B9/00, H01B7/14, H01B1/02
Cooperative ClassificationH01B7/14, H01B9/006, H01B1/023, Y10S428/926
European ClassificationH01B9/00P, H01B1/02B, H01B7/14