US4461020A
Expired / Lapsed
US
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Method of producing an anode and anode thus obtained
Assignee: US Philips Corp
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Filing: 1982-03-08
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Granted: 1984-07-17
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Expires: 2002-03-08
Abstract
Abstract The invention relates to anodes for X-ray tubes and a method of producing same. Several layers are deposited one after another onto a substrate by means of chemical vapour deposition. The proposed combination of layers results in a proper bond to the substrate. The combination comprises a first layer of molybdenum or a molybdenum alloy; a second layer of a tungsten-molybdenum alloy and a third layer of tungsten or a tungsten alloy. The composition of the second layer varies over its thickness.
Inventors
- 👤 Horst Hubner
- 👤 Frederik Magendans
- 👤 Bernhard J. P. van Rheenen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 12:21
CPC Classifications
H; H01; H01J; H01J35/00; H01J35/02; H01J35/04; H01J35/08; H01J35/10; H01J35/108; H01J2235/00; H01J2235/08; H01J2235/083; H01J2235/084; H01J2235/088
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
116 words
An anode for X-ray tubes comprising a substrate of molybdenum or molybdenum alloy, a first layer on said substrate of molybdenum or molybdenum alloy having more than 95% by weight of molybdenum, a second layer on said first layer of a tungsten-molybdenum alloy, said second layer having a composition at a side contiguous to said first layer of 95-100% by weight of molybdenum content and 0-5% by weight of tungsten content, said composition varying across said second layer to a composition at the opposite side from said first layer of 0-5% by weight of molybdenum content and 95-100% by weight of tungsten content, and a third layer on said second layer of tungsten or tungsten alloy.
Claim 2
Dependent Claim
116 words
An anode for X-ray tubes comprising a substrate of molybdenum or molybdenum alloy, a first layer on said substrate of molybdenum or molybdenum alloy having more than 95% by weight of molybdenum, a second layer on said first layer of a tungsten-molybdenum alloy, said second layer having a composition at a side contiguous to said first layer of 95-100% by weight of molybdenum content and 0-5% by weight of tungsten content, said composition varying across said second layer to a composition at the opposite side from said first layer of 0-5% by weight of molybdenum content and 95-100% by weight of tungsten content, and a third layer on said second layer of tungsten or tungsten alloy.
Claim 3
Dependent Claim
35 words
An anode according to claim 1, wherein said first layer has a thickness of 1-200 μm, said second layer has a thickness of 50-100 μm, and said third layer has a thickness of 400-600 μm.
Claim 4
Dependent Claim
31 words
An anode according to claim 2, wherein said third layer consists of a first sublayer of tungsten on said second layer and a second sublayer of tungsten or a tungsten alloy.
Claim 5
Dependent Claim
31 words
An anode according to claim 1, wherein said third layer consists of a first sublayer of tungsten on said second layer and a second sublayer of tungsten or a tungsten alloy.
Claim 6
Independent Claim
149 words
A method of producing anodes for X-ray tubes comprising the steps of chemically vapor depositing a first layer of molybdenum or molybdenum alloy containing more than 95% by weight of molybdenum onto a substrate of molybdenum, chemically vapor depositing a second layer of a tungsten-molybdenum alloy onto said first layer, said second layer having a composition at a side contiguous to said first layer of 95-100% by weight of molybdenum content and 0-5% by weight of tungsten content, said composition varying across said second layer to a composition at the opposite side from said first layer of 0-5% by weight of molybdenum content and 95-100% by weight of tungsten content, chemically vapor depositing a third layer of tungsten or tungsten alloy onto said opposite side of said second layer, and annealing said substrate and said layers in a non-oxidizing atmosphere for 10 minutes to 6 hours at 1200°-1700° C.
Claim 7
Independent Claim
149 words
A method of producing anodes for X-ray tubes comprising the steps of chemically vapor depositing a first layer of molybdenum or molybdenum alloy containing more than 95% by weight of molybdenum onto a substrate of molybdenum, chemically vapor depositing a second layer of a tungsten-molybdenum alloy onto said first layer, said second layer having a composition at a side contiguous to said first layer of 95-100% by weight of molybdenum content and 0-5% by weight of tungsten content, said composition varying across said second layer to a composition at the opposite side from said first layer of 0-5% by weight of molybdenum content and 95-100% by weight of tungsten content, chemically vapor depositing a third layer of tungsten or tungsten alloy onto said opposite side of said second layer, and annealing said substrate and said layers in a non-oxidizing atmosphere for 10 minutes to 6 hours at 1200°-1700° C.
Claim 8
Dependent Claim
41 words
A method according to claim 5, wherein said first layer is deposited with a thickness of 1-200 μm, said second layer is deposited with a thickness of 50-100 μm, said said third layer is deposited with a thickness of 400-600 μm.
Claim 9
Dependent Claim
34 words
A method according to claim 6, wherein said third layer is formed of a first sublayer consisting of tungsten on said second layer and a second sublayer consisting of tungsten or a tungsten alloy.
Claim 10
Dependent Claim
34 words
A method according to claim 5, wherein said third layer is formed of a first sublayer consisting of tungsten on said second layer and a second sublayer consisting of tungsten or a tungsten alloy.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-07-17 | 1988-01-16 | 1988-07-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-07-17 | 1992-01-16 | 1992-07-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-07-17 | 1996-01-16 | 1996-07-17 | $7700.00 | Window Closed / Lapsed |