EP0172491A2
Expired / Lapsed
EP
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Emissive coating on alloy X-ray tube target
Assignee: General Electric Co
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Filing: 1985-08-06
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Granted: —
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Expires: 2005-08-06
Abstract
Abstract An x-ray tube target composed of a molybdenum alloy material such as TZM is coated with a mixture containing from 40 percent to 70 percent of Ti0 2 with the remaining material being a stabilized oxide. The coating is then fused to a smooth, glossy condition to provide an enhanced thermal-emittance surface that adheres well to the target substrate.
Inventors
- 👤 Jauwhei Hong
- 👤 Richard Arlen Jens
- 👤 Steve Shou-Shu Shen
- 👤 Earle Lowry Manson, Jr.
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-26 18:55
CPC Classifications
H; H01; H01J; H01J35/00; H01J35/02; H01J35/04; H01J35/08; H01J35/10; H01J35/105
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
88 words
A thermal-emissive coating for an anode target of an x-ray tube of the type having a cathode for directing the flow of electrons to a focal track portion of the anode target to produce x-rays comprising a fused application of a mixture comprising from 40 percent to 70 percent by weight of TiO 2 with the remaining portion of the mixture being a stabilized oxide selected from the group consisting of Zr0 2 , HfO, M g O, CeO 2 , La 2 O 3 , and SrO.
Claim 2
Dependent Claim
88 words
A thermal-emissive coating for an anode target of an x-ray tube of the type having a cathode for directing the flow of electrons to a focal track portion of the anode target to produce x-rays comprising a fused application of a mixture comprising from 40 percent to 70 percent by weight of TiO 2 with the remaining portion of the mixture being a stabilized oxide selected from the group consisting of Zr0 2 , HfO, M g O, CeO 2 , La 2 O 3 , and SrO.
Claim 3
Dependent Claim
15 words
A thermal-emissive coating set forth in Claim 1 wherein said oxide is ZrO 2 .
Claim 4
Dependent Claim
39 words
A thermal-emittance coating as set forth in Claim 2 wherein said stabilized oxide comprises Zr0 2 in the amount of 86 to 96 percent by weight and CaO in the amount of 4 percent to 14 percent by weight.
Claim 5
Dependent Claim
89 words
A coating applied to a surface of an x-ray tube target for enhancing the thermal-emittance characteristics thereof comprising an applied mixture of TiO 2 in an amount of 40 percent to 70 percent by weight and a stabilized oxide in an amount of 30 to 60 percent by weight, said oxide being selected from the group consisting of ZrO 2 , HfO, MgO, CeO 2 , La 2 0 3 , and SrO, which applied mixture has been heated to a fused condition to provide a smooth, glossy surface.
Claim 6
Dependent Claim
89 words
A coating applied to a surface of an x-ray tube target for enhancing the thermal-emittance characteristics thereof comprising an applied mixture of TiO 2 in an amount of 40 percent to 70 percent by weight and a stabilized oxide in an amount of 30 to 60 percent by weight, said oxide being selected from the group consisting of ZrO 2 , HfO, MgO, CeO 2 , La 2 0 3 , and SrO, which applied mixture has been heated to a fused condition to provide a smooth, glossy surface.
Claim 7
Dependent Claim
17 words
A coating as set forth in Claim 4 wherein ZrO 2 is used as the oxide material.
Claim 8
Dependent Claim
31 words
A coating as set forth in Claim S wherein said stabilized oxide comprises 86 to 96 percent by weight of ZrO 2 and 4 to 14 percent by weight of CaO.
Claim 9
Dependent Claim
88 words
A thermal-emissive coating for an anode target of an x-ray tube of the type having a cathode for directing the flow of electrons to a focal track portion of the anode target to produce x-rays, said coating comprising the product resulting from fusing a mixture comprising from 40 percent to 70 percent by weight of TiO 2 and from 30 percent to 60 percent by weight of a stabilized oxide being selected from the group consisting of ZrO 2 , HfO, MgO, CeO 2 , La2030 and SrO.
Claim 10
Dependent Claim
88 words
A thermal-emissive coating for an anode target of an x-ray tube of the type having a cathode for directing the flow of electrons to a focal track portion of the anode target to produce x-rays, said coating comprising the product resulting from fusing a mixture comprising from 40 percent to 70 percent by weight of TiO 2 and from 30 percent to 60 percent by weight of a stabilized oxide being selected from the group consisting of ZrO 2 , HfO, MgO, CeO 2 , La2030 and SrO.
Claim 11
Dependent Claim
38 words
The thermal-emissive coating as set forth in Claim 7 wherein said stabilized oxide comprises ZrO 2 in the amount of 86 to 96 percent by weight and CaO in the amount of 4 to 14 percent by weight.
Claim 12
Independent Claim
86 words
A method of applying a thermal-emissive coating to an anode target comprising the steps of: applying to a surface of the target a coating mixture comprising from 40 percent to 70 percent by weight of TiO 2 and from 30 to 60 percent by weight of a stabilized oxide, and heating the target in a vacuum of at least 10 -5 Torr to a temperature in the range of 1620 to 1700°C for sufficient time to cause said coating to fuse to a smooth, glossy surface.
Claim 13
Independent Claim
86 words
A method of applying a thermal-emissive coating to an anode target comprising the steps of: applying to a surface of the target a coating mixture comprising from 40 percent to 70 percent by weight of TiO 2 and from 30 to 60 percent by weight of a stabilized oxide, and heating the target in a vacuum of at least 10 -5 Torr to a temperature in the range of 1620 to 1700°C for sufficient time to cause said coating to fuse to a smooth, glossy surface.
Claim 14
Dependent Claim
69 words
A coating applied to a surface of an x-ray tube target for enhancing the thermal-emittance characteristics thereof comprising an applied mixture of TiO 2 in an amount of 40 percent to 70 percent by weight and stabilized ZrO 2 in an amount of 30 percent to 60 percent by weight which applied mixture has been heated to a fused condition to provide a smooth, glossy surface of the target.
Claim 15
Dependent Claim
69 words
A coating applied to a surface of an x-ray tube target for enhancing the thermal-emittance characteristics thereof comprising an applied mixture of TiO 2 in an amount of 40 percent to 70 percent by weight and stabilized ZrO 2 in an amount of 30 percent to 60 percent by weight which applied mixture has been heated to a fused condition to provide a smooth, glossy surface of the target.
Claim 16
Dependent Claim
38 words
A coating as set forth in Claim 10 wherein said stabilized ZrO 2 comprises ZrO Z in an amount of 86 to 96 percent by weight and CaO in an amount of 4 to 14 percent by weight.
References Cited (Backward Citations)
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