US5246480A
Expired / Lapsed
US
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Sintered contact material based on silver for use in power engineering switch-gear, in particular for contact pieces in low-voltage switches
Assignee: Siemens AG
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Filing: 1989-04-19
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Granted: 1993-09-21
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Expires: 2009-04-19
Abstract
Abstract PCT No. PCT/DE89/00239 Sec. 371 Date Oct. 17, 1990 Sec. 102(e) Date Oct. 17, 1990 PCT Filed Apr. 19, 1989 PCT Pub. No. WO89/10417 PCT Pub. Date Nov. 2, 1989.In a contact material, there is present in addition to silver, at least one higher melting point metal, metal alloy or metal compound. According to the invention, the material contains in addition to silver (Ag), at least iron (Fe) and/or titanium (Ti) in percent by weight of from 2 to 50%. Optionally, nitrides, carbides and/or borides of the metals titanium, zirconium and/or tantalum may also e present. It has been found that in their contact property spectrum such materials are largely equivalent to the material AgNi10. Thus the latter contact material can be replaced completely.
Inventors
- 👤 Wolfgang Haufe
- 👤 Joachim Grosse
- 👤 Bernhard Rothkegel, deceased
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 19:47
CPC Classifications
C; C22; C22C; C22C32/00; C22C32/0047; C22C1/00; C22C1/04; C22C1/0466; C22C1/05; C22C1/059; H; H01; H01H; H01H1/00; H01H1/02; H01H1/021; H01H1/023
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
124 words
A silver based sintered contact material for use in energy technology switch-gear comprising silver and at least one active component which comprises metal, metal alloy and having a melting point higher than silver or metal compound, said contact material consisting essentially of: a main active component being iron (Fe) and titanium (Ti) present in alloyed form; a selective additional active component being at least one member selected from the group consisting of metal nitride, metal carbide, metal boride, and mixtures thereof; all active components being present in the contact material in a proportion in percent by weight between 2% and 50%; said additional active component comprising in percent by weight up to 50% with reference to the proportion of iron and titanium; balance, silver.
Claim 2
Dependent Claim
124 words
A silver based sintered contact material for use in energy technology switch-gear comprising silver and at least one active component which comprises metal, metal alloy and having a melting point higher than silver or metal compound, said contact material consisting essentially of: a main active component being iron (Fe) and titanium (Ti) present in alloyed form; a selective additional active component being at least one member selected from the group consisting of metal nitride, metal carbide, metal boride, and mixtures thereof; all active components being present in the contact material in a proportion in percent by weight between 2% and 50%; said additional active component comprising in percent by weight up to 50% with reference to the proportion of iron and titanium; balance, silver.
Claim 3
Dependent Claim
19 words
A sintered contact material according to claim 1 wherein the proportion of all active components is less than 40%.
Claim 4
Dependent Claim
19 words
A sintered contact material according to claim 2 wherein the proportion of all active components is less than 30%.
Claim 5
Dependent Claim
18 words
Sintered contact material according to claim 3 wherein the proportion of all active components is less than 2%.
Claim 6
Dependent Claim
35 words
Sintered contact material according to claim 1 wherein iron (Fe) and titanium (Ti) are present with respect to one another in percent by weight of about 54% to 46% and form the intermetallic compound FeTi.
Claim 7
Dependent Claim
25 words
Sintered contact material according to claim 1 wherein the metal of the group consisting of metal nitride, metal carbide, and metal boride is titanium (Ti).
Claim 8
Dependent Claim
25 words
Sintered contact material according to claim 1 wherein the metal of the group consisting of metal nitride, metal carbide, and metal boride is zirconium (Zr).
Claim 9
Dependent Claim
25 words
Sintered contact material according to claim 1 wherein the metal of the group consisting of metal nitride, metal carbide, and metal boride is tantalum (Ta).
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1996-09-20 | 1997-03-22 | 1997-09-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2000-09-20 | 2001-03-22 | 2001-09-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2004-09-20 | 2005-03-22 | 2005-09-21 | $7700.00 | Window Closed / Lapsed |