US5159619A
Expired / Lapsed
US
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High performance metal x-ray tube target having a reactive barrier layer
Assignee: General Electric Co
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Filing: 1991-09-16
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Granted: 1992-10-27
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Expires: 2011-09-16
Abstract
Abstract A high performance x-ray tube rotating target having a reactive barier layer between the substrate and the emissive coating and, if desired, a protective layer of molybdenum between the reactive barrier and the emissive coating is disclosed.
Inventors
- 👤 Mark G. Benz
- 👤 Melvin R. Jackson
- 👤 Robert J. Zabala
- 👤 Karen A. Lou
- 👤 Thomas C. Tiearney, Jr.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 09:02
CPC Classifications
H; H01; H01J; H01J35/00; H01J35/02; H01J35/04; H01J35/08; H01J35/10; H01J35/105; H01J2235/00; H01J2235/12; H01J2235/1204; H01J2235/1225; H01J2235/1229; H01J2235/1233; H01J2235/1237; H01J2235/1241
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
81 words
An x-ray tube anode comprising a body having a focal track region for impingement by electrons to produce x-rays, a coating distinct from said region for enhancing heat emittance from the body, a reactive barrier layer interposed between the body and the heat emissive coating said reactive barrier layer comprising a molybdenum or niobium base alloy containing from about 1 to about 20 atom percent of a metal selected from the group consisting of titanium, niobium, hafnium, zirconium, tungsten and tantalum.
Claim 2
Dependent Claim
81 words
An x-ray tube anode comprising a body having a focal track region for impingement by electrons to produce x-rays, a coating distinct from said region for enhancing heat emittance from the body, a reactive barrier layer interposed between the body and the heat emissive coating said reactive barrier layer comprising a molybdenum or niobium base alloy containing from about 1 to about 20 atom percent of a metal selected from the group consisting of titanium, niobium, hafnium, zirconium, tungsten and tantalum.
Claim 3
Dependent Claim
58 words
An x-ray tube anode of claim 1 comprises a body having a molybdenum alloy substrate, a focal track region on the front of the substrate for impingement by electrons to produce x-rays, a coating distinct from said region for enhancing heat emittance from the body, a reactive barrier layer interposed between the substrate and the heat emissive coating.
Claim 4
Dependent Claim
33 words
The anode of claim 2 wherein the substrate alloy comprises about 0.05 atom percent titanium, about 0.08 atom percent zirconium, up to about 250 parts per million carbon, and the balance substantially molybdenum.
Claim 5
Dependent Claim
19 words
The anode of claim 3 in which the reactive barrier is from about 0.005 to about 0.030 inch thick.
Claim 6
Dependent Claim
68 words
An x-ray tube anode comprising a body having a substrate, a focal track region on the front of the substrate for impingement by electrons to produce x-rays, a coating distinct from said region for enhancing heat emittance from the body, a reactive barrier layer interposed between the substrate and the heat emissive coating, and a protective layer interposed between the reactive barrier layer and the heat emissive coating.
Claim 7
Dependent Claim
68 words
An x-ray tube anode comprising a body having a substrate, a focal track region on the front of the substrate for impingement by electrons to produce x-rays, a coating distinct from said region for enhancing heat emittance from the body, a reactive barrier layer interposed between the substrate and the heat emissive coating, and a protective layer interposed between the reactive barrier layer and the heat emissive coating.
Claim 8
Dependent Claim
39 words
The anode according to claim 5 wherein the protective layer is an alloy comprising from about 1 to about 20 atom percent of a member selected from the group consisting of zirconium and hafnium, the balance being substantially molybdenum.
Claim 9
Independent Claim
83 words
A method for stabilizing performance of rotating target x-ray tubes which includes a rotating anode target comprising a molybdenum alloy substrate comprising about 0.05 atom percent titanium, about 0.08 atom percent zirconium, up to about 250 parts per million carbon, and the balance molybdenum, a focal track, and a heat emissive coating which comprises placing a reactive barrier layer between the substrate and the emissive coating and a protective layer of substantially carbon-free molybdenum between the reactive barrier layer and the emissive coating.
Claim 10
Independent Claim
83 words
A method for stabilizing performance of rotating target x-ray tubes which includes a rotating anode target comprising a molybdenum alloy substrate comprising about 0.05 atom percent titanium, about 0.08 atom percent zirconium, up to about 250 parts per million carbon, and the balance molybdenum, a focal track, and a heat emissive coating which comprises placing a reactive barrier layer between the substrate and the emissive coating and a protective layer of substantially carbon-free molybdenum between the reactive barrier layer and the emissive coating.
Claim 11
Dependent Claim
45 words
A method according to claim 7 wherein the reactive barrier layer is comprised of a molybdenum or niobium base alloy alloyed with from about 1 to about 20 atom percent of a metal selected from the group consisting of zirconium, hafnium, titanium, niobium, and tantalum.
Claim 12
Dependent Claim
58 words
The method according to claim 7 wherein the reactive barrier layer is from about 1 to about 30 mils thick and comprises an alloy comprising a base metal selected from the group consisting of molybdenum and niobium and from about 5 to about 20 atom percent of a metal selected from the group consisting of hafnium and zirconium.
Claim 13
Independent Claim
78 words
A method for substantially inhibiting formation of carbon monoxide in an x-ray tube having a rotating anode target comprising a carbon-containing alloy substrate, an oxide-containing emissive coating, and a focal track which comprises providing a reactive barrier layer between the emissive coating and the substrate, the reactive barrier layer being molybdenum or niobium alloy comprising from about 5 to about 20 atom percent of a metal selected from the group consisting of hafnium, zirconium, tantalum, titanium, and niobium.
Claim 14
Independent Claim
78 words
A method for substantially inhibiting formation of carbon monoxide in an x-ray tube having a rotating anode target comprising a carbon-containing alloy substrate, an oxide-containing emissive coating, and a focal track which comprises providing a reactive barrier layer between the emissive coating and the substrate, the reactive barrier layer being molybdenum or niobium alloy comprising from about 5 to about 20 atom percent of a metal selected from the group consisting of hafnium, zirconium, tantalum, titanium, and niobium.
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) | 1995-10-27 | 1996-04-27 | 1996-10-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-10-27 | 2000-04-27 | 2000-10-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-10-27 | 2004-04-27 | 2004-10-27 | $7700.00 | Window Closed / Lapsed |