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EP0244776A2 Expired / Lapsed EP ⏱️ 0.0 years remaining

Emissive coating for X-ray target

Assignee: General Electric Co
•
Filing: 1987-04-30
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Granted: —
•
Expires: 2007-04-30
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Abstract

Abstract The present invention employs a mechanical mixture of titanium dioxide and calcium oxide which is sintered and ground to produce a ceramic powder for application to a target of an X-ray tube. The powder is fused by baking the target at a predetermined baking temperature to produce a coating having an enhanced coefficient of emissivity. The required baking temperature is controllable by varying the proportion of titanium dioxide to calcium oxide. Baking time may be extended without degrading the coating by mechanically mixing zirconium dioxide to the sintered and ground ceramic powder prior to application to the X-ray target in order to enhance outgassing from the target substrate. The resulting coating on the target improves the emissivity thereof and exhibits and improved bond strength over coatings of the prior art.

Inventors

  • 👤 Clarence Odell Clark
  • 👤 Jauwhei Hong

Bibliographic Details

Application Number —
Jurisdiction EP
Data Source google_patents
Last Synchronized 2026-10-26 21:45
CPC Classifications
C; C23; C23C; C23C24/00; C23C24/08; C23C24/10; C23C4/00; C23C4/04; C23C4/10; C23C4/11; C23C4/18

Claims Analysis

Total Claims: 11
Claim 1
Independent Claim 101 words
A process for producing an emissive coating on a substrate of an X-ray target comprising: mechanically mixing from about 77 weight percent to about 85 weight percent titanium dioxide with from about 23 weight percent to about 15 weight percent calcium oxide to produce a mixture; sintering said mixture at a temperature below a melting temperature thereof to produce a ceramic mass; grinding and screening said ceramic mass to produce a ceramic powder; applying said ceramic powder to said substrate; and baking said ceramic powder at a temperature and for a time effective to fuse said ceramic powder to said substrate.
Claim 2
Dependent Claim 101 words
A process for producing an emissive coating on a substrate of an X-ray target comprising: mechanically mixing from about 77 weight percent to about 85 weight percent titanium dioxide with from about 23 weight percent to about 15 weight percent calcium oxide to produce a mixture; sintering said mixture at a temperature below a melting temperature thereof to produce a ceramic mass; grinding and screening said ceramic mass to produce a ceramic powder; applying said ceramic powder to said substrate; and baking said ceramic powder at a temperature and for a time effective to fuse said ceramic powder to said substrate.
Claim 3
Dependent Claim 23 words
A process according to claim 1 wherein the step of mechanically mixing includes from about 78 to about 84 weight percent titanium dioxide.
Claim 4
Dependent Claim 23 words
A process according to claim 1, further comprising adding a proportion of zirconium dioxide to said ceramic powder before applying to said substrate.
Claim 5
Dependent Claim 15 words
A process according to claim 3 wherein said proportion is less than 50 weight percent.
Claim 6
Dependent Claim 18 words
A process according to claim 4 wherein said proportion is from about 35 to about 45 weight percent.
Claim 7
Dependent Claim 28 words
A process according to claim 3 wherein said proportion is effective for controlling said time to a value at least great enough to achieve outgassing of said substrate.
Claim 8
Dependent Claim 34 words
A process according to claim 1 wherein the step of mechanically mixing includes proportioning said titanium dioxide to said calcium oxide in a proportion effective to control a melting temperature of said ceramic powder.
Claim 9
Dependent Claim 9 words
A coating produced by the method of claim 1.
Claim 10
Dependent Claim 16 words
A target for an X-ray tube having a coating produced by the method of claim 1.
Claim 11
Dependent Claim 46 words
A process according to claim 1 wherein the step of mechanically mixing includes proportioning said titanium dioxide and said calcium oxide in proportions effective to produce a ceramic powder which may be baked at a temperature at least 25 degrees C below a substrate reaction temperature.

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