US4766349A
Expired / Lapsed
US
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Arc electrode
Assignee: Linde Sverige AB
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Filing: 1986-06-05
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Granted: 1988-08-23
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Expires: 2006-06-05
Abstract
Abstract An electrode for electric arc processes composed of a water-cooled holder (1) into which is fitted a case hardened of diffusion coated insert of zirconium or hafnium. The diffusion zone (5) consists of carbide, nitride, boride or silicide, compounds with very high melting points that will supress reactions between the holder and the insert that cause deterioration of the electrode.
Inventors
- 👤 Jan O. Johansson
- 👤 Jan-Erik Andersson
- 👤 Tomasz Niklewski
- 👤 Lars E. Edshammar
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-10 01:58
CPC Classifications
B; B23; B23K; B23K35/00; B23K35/02; B23K35/0205; H; H05; H05H; H05H1/00; H05H1/24; H05H1/26; H05H1/32; H05H1/34; H05H1/3442
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
49 words
An electrode for plasma arc working in active or inert media comprising a holder of high thermal and electrical conductivity into which is fitted a diffusion coated or case hardened zirconium or hafnium insert to provide a diffusion zone of high temperature compounds between said holder and said insert.
Claim 2
Dependent Claim
49 words
An electrode for plasma arc working in active or inert media comprising a holder of high thermal and electrical conductivity into which is fitted a diffusion coated or case hardened zirconium or hafnium insert to provide a diffusion zone of high temperature compounds between said holder and said insert.
Claim 3
Dependent Claim
54 words
An electrode according to claim 1 wherein said insert has been prepared by case hardening or diffusion coating of a zirconium or hafnium insert in order to introduce a diffusion zone of high temperature compounds between said holder and said insert into the surface with a melting temperature in the range of 2000°-4000° C.
Claim 4
Dependent Claim
34 words
An electrode according to claim 1 wherein said insert has been case hardened or diffusion coated by carborizing, nitriding, oxinitriding, carbonitriding, nitrocarborizing, boriding or siliciding by heating in gas, liquid salt bath or powder.
Claim 5
Dependent Claim
34 words
An electrode according to claim 2 wherein said insert has been case hardened or diffusion coated by carborizing, nitriding, oxinitriding, carbonitriding, nitrocarborizing, boriding, or siliciding by heating in gas, liquid salt bath, or powder.
Claim 6
Dependent Claim
23 words
The electrode of claim 1 wherein said insert provides a diffusion zone between said holder and insert of 10 to 100 micrometers thick.
Claim 7
Dependent Claim
36 words
The electrode of claim 1 wherein said insert provides a diffusion zone between said holder and insert of a material selected from the group of carbides, nitrides, oxynitrides, carbonnitrides, borides, and silicides of zirconium or hafnium.
Claim 8
Dependent Claim
10 words
The electrode of claim 1 wherein said holder is copper.
References Cited (Backward Citations)
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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) | 1991-08-23 | 1992-02-22 | 1992-08-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-08-23 | 1996-02-22 | 1996-08-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-08-23 | 2000-02-22 | 2000-08-23 | $7700.00 | Window Closed / Lapsed |