US4090103A
Expired / Lapsed
US
⏱️ 0.0 years remaining
X-ray target
Assignee: Schwarzkopf Technologies Corp
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Filing: 1976-03-16
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Granted: 1978-05-16
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Expires: 1996-03-16
Abstract
Abstract An X-ray target, preferably a rotating target is disclosed in which at least part of the target surface outside the focal area contains a coating layer of a mixture composed of molybdenum, tungsten, niobium or tantalum, and from 20-60 volume percent of a ceramic oxide.
Inventors
- 👤 Rudolf Machenschalk
- 👤 Hubert Bildstein
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 20:03
CPC Classifications
H; H01; H01J; H01J35/00; H01J35/02; H01J35/04; H01J35/08; H01J35/10; H01J35/105
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
68 words
An X-ray target made of a refractory metal having a high thermal emission coating outside the focal area, the improvement comprising having at least part of the target surface outside the focal area equipped with a coating of a mixture material consisting of a substance selected from the group consisting of molybdenum, tungsten, niobium, tantalum and mixtures thereof; and 20 to 60 volume percent of a ceramic oxide.
Claim 2
Dependent Claim
68 words
An X-ray target made of a refractory metal having a high thermal emission coating outside the focal area, the improvement comprising having at least part of the target surface outside the focal area equipped with a coating of a mixture material consisting of a substance selected from the group consisting of molybdenum, tungsten, niobium, tantalum and mixtures thereof; and 20 to 60 volume percent of a ceramic oxide.
Claim 3
Dependent Claim
14 words
The X-ray target according to claim 1 wherein said target is a rotating target.
Claim 4
Dependent Claim
31 words
The X-ray target according to claim 1 wherein said ceramic oxide is selected from the group consisting of Ti0 2 , Al 2 0 3 , Zr0 2 and mixtures thereof.
Claim 5
Dependent Claim
24 words
The X-ray target according to claim 1 wherein the coating layer of the mixture material has a thickness of from 10 to 500 microns.
Claim 6
Dependent Claim
32 words
The X-ray target according to claim 3 wherein the mixture material consists of 60 volume percent molybdenum and 40 volume percent Ti0 2 and has a coating layer thickness of 60 microns.
Claim 7
Dependent Claim
23 words
The X-ray target according to claim 1 wherein the refractory metal is selected from the group consisting of sintered molybdenum and molybdenum-tungsten alloy.
Claim 8
Dependent Claim
68 words
The rotating X-ray target according to claim 2 wherein the mixture material consists of 60 volume percent molybdenum and 40 volume percent Ti0 2 coated on the underside of the rotating target made of a molybdenum-5 wt.% tungsten alloy, the upper side of the rotating target coated with a tungsten-10 wt.% rhenium alloy in the focal area, said mixture material having a coating layer thickness of 60 microns.
Claim 9
Dependent Claim
32 words
A method for producing the X-ray target according to claim 1 which comprises applying the mixture material to the refractory metal in the form of a powder by flame or plasma spraying.
Claim 10
Dependent Claim
22 words
The method of claim 8 wherein said powder comprises particles having a particle size in the range from 10 to 40 microns.
Claim 11
Dependent Claim
20 words
The method of claim 8 wherein said mixture material is presintered and comminuted prior to application to the refractory metal.
Claim 12
Dependent Claim
15 words
The method of claim 8 wherein subsequent to application, the deposited material mixture is annealed.
Claim 13
Dependent Claim
27 words
The method of claim 11 wherein said annealing is effected for about 1 hour at a temperature of 1600° C under vacuum or in a hydrogen atmosphere.
Claim 14
Dependent Claim
14 words
The method of claim 11 wherein prior to annealing, an etching treatment is effected.
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) | 1981-05-15 | 1981-11-14 | 1982-05-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-05-15 | 1985-11-14 | 1986-05-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-05-15 | 1989-11-14 | 1990-05-16 | $7700.00 | Window Closed / Lapsed |