EP0212666A2
Expired / Lapsed
EP
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Electrical contact containing intercalated graphite
Assignee: Intercal Co
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Filing: 1986-08-27
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Granted: —
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Expires: 2006-08-27
Abstract
Abstract An electric motor brush or other electrical contact fabricated with intercalated graphite exhibits improved electrical conductivity, strength and performance when compared with electrical brushes made with non-intercalated graphite or with carbon. Such contacts may be formed by filling a mold of the appropriate shape with intercalated graphite powder and applying sufficient pressure and heat to produce a coherent mass. The ability of intercalated graphite powder to be compacted in such a fashion leads to economic methods of manufacturing electrical contacts. The properties of these contacts may be further improved by the incorporation of metal powder, organic polymers or ceramic powders into the intercalated graphite prior to pressing.
Inventors
- 👤 Ferdinand Lincoln Vogel
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-03 08:43
CPC Classifications
B; B60; B60L; B60L5/00; B60L5/18; B60L5/20; B60L5/205; H; H01; H01B; H01B1/00; H01B1/04; H01R; H01R39/00; H01R39/02; H01R39/18; H01R39/20; H01R39/22
Claims Analysis
Total Claims: 22
Claim 1
Independent Claim
22 words
An electrical contact comprising a compact body formed from an intercalated graphite powder which is stable in air and at elevated temperatures.
Claim 2
Dependent Claim
22 words
An electrical contact comprising a compact body formed from an intercalated graphite powder which is stable in air and at elevated temperatures.
Claim 3
Dependent Claim
16 words
An electrical contact in accordance with claim 1 wherein the contact is an electric motor brush.
Claim 4
Dependent Claim
15 words
An electrical contact in accordance with claim 1 wherein the contact is a pantograph contact.
Claim 5
Dependent Claim
17 words
An electrical contact in accordance with claim 1 wherein the contact is a electrostatic discharge machinery tool.
Claim 6
Dependent Claim
14 words
An electrical contact in accordance with claim 1 wherein the contact is a gear.
Claim 7
Dependent Claim
97 words
6 . An electrical contact in accordance with any of claims 1 to 5 wherein the intercalated graphite is intercalated with an intercalation species selected from the group consisting of a metal halide and a metal, wherein the metal halide is preferably selected from the group consisting of a halide of a transition element, a halide of a Group IIIA, IV A, V A and VI A metal or metalloid and the metal is selected from the group consisting of a transition element, a Group III A, IV A, V A and VI A metal or metalloid.
Claim 8
Dependent Claim
37 words
An electrical contact in accordance with claim 6 wherein the metal halide, prior to forming said contact, is reduced in situ to a metal in the presence of a reducing agent 'thus forming a metal intercalated graphite.
Claim 9
Dependent Claim
30 words
An electrical contact in accordance with claim 6 or 7 wherein the metal halide is selected from the group consisting of copper chloride, nickel chloride, chromium chloride, and cadmium chloride.
Claim 10
Dependent Claim
22 words
An electrical contact in accordance with any of claims 1 to 8 further comprising a metal powder admixed with the intercalated graphite.
Claim 11
Dependent Claim
28 words
An electrical contact in accordance with claim 9 wherein the metal powder comprises from about 2 wt. per cent to about 90 wt. per cent of said contact.
Claim 12
Dependent Claim
19 words
An electrical contact in accordance with any of claims 1 to 10 wherein the powder particles are metal plated.
Claim 13
Dependent Claim
37 words
An electrical contact in accordance with any of claims 1 to 11 further comprising a polymer admixed with the intercalated graphite, the polymer being selected from the group consisting of a thermoplastic polymer and a thermosetting polymer.
Claim 14
Dependent Claim
27 words
An electrical contact in accordance with claim 12 wherein the polymer comprises from about 1 wt per cent to about 30 wt per cent of the contact.
Claim 15
Dependent Claim
23 words
An electrical contact in accordance with any of claims 1 to 13 - further comprising a ceramic powder admixed with the intercalated graphite.
Claim 16
Dependent Claim
54 words
An electrical contact in accordance with claim 14 wherein the ceramic powder comprises from about 5 wt. per cent to about 85 wt. per cent of said contact and wherein the ceramic powder is selected from the group comprised of silicon nitride, boron carbide, silicon carbide, partially stabilized zirconia, titanium oxides and mixtures thereof.
Claim 17
Independent Claim
41 words
A method of forming an electrical contact by compacting intercalacted graphite particles at a pressure of between about 1,000 pounds per square inch and about 150,000 pounds per square inch and at a temperature of between about 20°C and about 1000°C.
Claim 18
Independent Claim
41 words
A method of forming an electrical contact by compacting intercalacted graphite particles at a pressure of between about 1,000 pounds per square inch and about 150,000 pounds per square inch and at a temperature of between about 20°C and about 1000°C.
Claim 19
Dependent Claim
13 words
A method in accordance with claim 16 wherein said pressure is generated uniaxially.
Claim 20
Dependent Claim
13 words
A method in accordance with claim 16 wherein said pressure is generated isostatically.
Claim 21
Dependent Claim
22 words
A method in accordance with claim 16 wherein the contact is formed by pre-pressing said particles uniaxially followed by an isostatic pressing.
Claim 22
Dependent Claim
13 words
An electrical contact producible with the method according to claims 16 to 19.
References Cited (Backward Citations)
No citation records indexed.
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