Patent EP0101024A2 successfully refreshed from Google Patents.
EP0101024A2
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EP
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Contact material of vacuum interrupter and manufacturing process therefor
Assignee: Meidensha Corp
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Filing: 1983-08-04
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Granted: —
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Expires: 2003-08-04
Abstract
Abstract Contact materials of a vacuum interrupter and producing process therefor are disclosed. The contact materials provide a contact which is much high in relatively large current and small lagging and leading current interrupting capabilities and dielectric strength while a little in an anti-welding capability down. The contact materials are composed of between 20 and 70 weight % copper, between 5 and 70 weight % molybdenum and between 5 and 70 weight % chromium. The contact material is produced by diffusion bonding a mixture of molybdenum powder and chromium powder into a porous matrix and infiltrating the matrix with copper. Alternatively, the contact materials may be produced by sintering a mixture of three metal powders.
Inventors
- 👤 Yoshiyuki Kashiwagi
- 👤 Yasushi Noda
- 👤 Kaoru Kitakizaki
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-01 17:59
CPC Classifications
H; H01; H01H; H01H1/00; H01H1/02; H01H1/0203; H01H1/0206; Y; Y10; Y10T; Y10T428/00; Y10T428/12; Y10T428/12014; Y10T428/1216; Y10T428/12174
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
32 words
Contact material of composite metal for a vacuum interrupter comprising: between 20 and 70 weight % copper; between 5 and 70 weight % molybdenum; and between 5 and 70 weight % chromium.
Claim 2
Dependent Claim
32 words
Contact material of composite metal for a vacuum interrupter comprising: between 20 and 70 weight % copper; between 5 and 70 weight % molybdenum; and between 5 and 70 weight % chromium.
Claim 3
Dependent Claim
51 words
Contact material of composite metal for a vacuum interrupter comprising: a porous matrix into which between 5 and 70 weight % molybdenum powder and between 5 and 70 weight % chromium powder are diffusion bonded to each other; and between 20 and 70 weight % copper infiltrated into the porous matrix.
Claim 4
Dependent Claim
51 words
Contact material of composite metal for a vacuum interrupter comprising: a porous matrix into which between 5 and 70 weight % molybdenum powder and between 5 and 70 weight % chromium powder are diffusion bonded to each other; and between 20 and 70 weight % copper infiltrated into the porous matrix.
Claim 5
Dependent Claim
22 words
Contact material for a vacuum interrupter defined in claim 2, wherein a particle size of each metal powder is minus 100 meshes.
Claim 6
Dependent Claim
20 words
Contact material for a vacuum interrupter defined in claim 1, wherein a mixture of powders of said metals are sintered.
Claim 7
Dependent Claim
22 words
Contact material for a vacuum interrupter defined in claim 4, wherein a particle size of each metal powder is minus 100 meshes.
Claim 8
Dependent Claim
164 words
A process for producing contact material for a vacuum interrupter comprising the steps of: mixing between 5 and 70 weight % molybdenum powder and between 5 and 70 weight % chromium powder which amount to between 30 and 80 weight % in total; . placing the obtained mixture of the powders, and between 20 and 70 weight % solid copper in a vessel on 'which none of molybdenum, chromium and copper reacts; diffusion bonding the mixture of the powders, and the solid copper at a temperature of below melting point of copper during a fixed time into a porous matrix of molybdenum and chromium; and infiltrating the porous matrix with molten copper which is concurrently obtained by heat holding the porous matrix and solid copper at a temperature of at least melting point of copper but below melting point of the porous matrix during a fixed time, said placing, diffusion bonding and infiltrating steps all being continuously carried out under the same non-oxidizing atmosphere.
Claim 9
Dependent Claim
164 words
A process for producing contact material for a vacuum interrupter comprising the steps of: mixing between 5 and 70 weight % molybdenum powder and between 5 and 70 weight % chromium powder which amount to between 30 and 80 weight % in total; . placing the obtained mixture of the powders, and between 20 and 70 weight % solid copper in a vessel on 'which none of molybdenum, chromium and copper reacts; diffusion bonding the mixture of the powders, and the solid copper at a temperature of below melting point of copper during a fixed time into a porous matrix of molybdenum and chromium; and infiltrating the porous matrix with molten copper which is concurrently obtained by heat holding the porous matrix and solid copper at a temperature of at least melting point of copper but below melting point of the porous matrix during a fixed time, said placing, diffusion bonding and infiltrating steps all being continuously carried out under the same non-oxidizing atmosphere.
Claim 10
Dependent Claim
21 words
A process defined in claim 6, wherein the non-oxidizing atmosphere is a vacuum of at highest 5 x 10 -5 Torr.
Claim 11
Dependent Claim
97 words
A process for producing contact material for a vacuum interrupter comprising the steps of: mixing between 5 and 70 weight % molybdenum powder and between 5 and 70 weight % chromium powder which amount to between 30 and 80 weight % in total; diffusion bonding the obtained mixture of the powders under non-oxidizing atmosphere at a temperature of below melting point of chromium during a fixed time into a porous matrix of molybdenum and chromium; and infiltrating the obtained porous matrix with between 20 and 70 weight % molten copper under the same or another non-oxidizing atmosphere.
Claim 12
Dependent Claim
97 words
A process for producing contact material for a vacuum interrupter comprising the steps of: mixing between 5 and 70 weight % molybdenum powder and between 5 and 70 weight % chromium powder which amount to between 30 and 80 weight % in total; diffusion bonding the obtained mixture of the powders under non-oxidizing atmosphere at a temperature of below melting point of chromium during a fixed time into a porous matrix of molybdenum and chromium; and infiltrating the obtained porous matrix with between 20 and 70 weight % molten copper under the same or another non-oxidizing atmosphere.
Claim 13
Dependent Claim
64 words
A process defined in claim 8, wherein said copper infiltrating step comprises: placing solid copper in close' to the porous matrix; and infiltrating the porous matrix with molten copper which is concurrently obtained by heat holding the porous matrix and solid copper at a temperature of at least melting point of copper but below melting point of the porous matrix during a fixed time.
Claim 14
Dependent Claim
29 words
A process defined in claim 9, wherein said copper infiltrating step is carried out under a non-oxidizing atmosphere of a vacuum of at highest 5 x 10 -5 Torr.
Claim 15
Dependent Claim
79 words
ll. A process for producing contact material for a vacuum interrupter comprising the steps of: mixing between 20 and 70 weight % copper powder, mixing between 20 and 70 weight % copper powder, between 5 and 70 weight % molybdenum powder and between 5 and 70 weight % chromium; press shaping the obtained mixture of the powders into a green compact; and sintering the obtained green compact under non-oxidizing atmosphere at a temperature of below melting point of chromium.
Claim 16
Dependent Claim
79 words
ll. A process for producing contact material for a vacuum interrupter comprising the steps of: mixing between 20 and 70 weight % copper powder, mixing between 20 and 70 weight % copper powder, between 5 and 70 weight % molybdenum powder and between 5 and 70 weight % chromium; press shaping the obtained mixture of the powders into a green compact; and sintering the obtained green compact under non-oxidizing atmosphere at a temperature of below melting point of chromium.
Claim 17
Dependent Claim
24 words
12 . A process defined in claim 11, wherein said sintering step is carried out at a temperature of below melting point of copper.
References Cited (Backward Citations)
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