IP Library › Granted Patent US 6,849,296
Granted Patent B2
US 6,849,296 · App. 10/064,588 · Granted Feb 1, 2005

Leakage free ceramic films for porous surfaces

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Quick Facts
Patent No.
US 6,849,296
App. No.
10/064,588
Granted
Feb 1, 2005
Kind
B2
Abstract

A porous ceramic substrate structure ( 10 ) having an interior portion ( 12 ) formed with an outer surface ( 14 ) is porous to at least one selected gas ( 16 ). A first ceramic coating layer ( 18 ) is applied to the outer surface ( 14 ) of the ceramic substrate structure ( 10 ) in a suspension state. The first ceramic coating suspension ( 20 ) has a desired level of viscosity for application to the substrate and is formed with a ceramic electrolyte powder and at least one organic additive. A second ceramic coating layer ( 22 ) is applied to the outer surface ( 14 ) following application of the first coating ( 18 ). The second coating ( 22 ) is initially applied after the first coating ( 18 ) and in a suspension state. The ceramic layers ( 18 and 22 ) substantially prevent gas leakage through the outer surface ( 14 ).

Claims (8)

1. A method of manufacturing a ceramic film for reducing leakage of a selected gas through an outer surface of a porous ceramic substrate structure having an interior portion formed with the outer surface; the substrate being porous to at least one selected gas comprising:

applying a first ceramic coating layer to at least a portion of the outer surface of the ceramic substrate structure; the first ceramic coating being initially applied in a suspension state, the first ceramic coating suspension having a desired level of viscosity for substantially uniform application to the surface; and being formed with a ceramic electrolyte powder and at least one organic additive; and

applying a second ceramic coating layer to at least a portion of the outer surface of the ceramic substrate structure following application of the first ceramic coating and subsequent to a drying process of the first ceramic coating; the second ceramic coating being initially applied subsequent to application of the first ceramic coating; the second ceramic coating being initially applied in a suspension state having a lower viscosity relative to the viscosity of the suspension used for the first coating.

2. The method of claim 1 further including applying a third ceramic coating layer to at least a portion of the outer surface of the ceramic substrate structure following application of the second ceramic coating; the third ceramic coating being initially applied subsequent to applying the second ceramic coating; the third ceramic coating being initially applied as a suspension having a lower viscosity relative to the viscosity of the second ceramic coating.

3. The method of claim 1 wherein a vacuum is applied to the ceramic substrate structure on a side directionally opposite to the first ceramic coating in relation to the outer surface; the vacuum is formed during the application of the ceramic coating to the ceramic substrate structure while the ceramic coating is in a suspension state.

4. The method of claim 1 wherein the first ceramic coating comprises toluene, ethanol, butyl benzyl phthalate, polyvinyl butyral, and a powder of Ce 0.8 Gd 0.2 O 2 (CGO).

5. The method of claim 1 wherein the ceramic coating layers are applied to the ceramic substrate by dipping a portion of the ceramic substrate into the desired suspension.

6. The method of claim 1 wherein the viscosity of the ceramic coating suspension is in the range of 50-200 cPs.

Assignments (6)
PARTIAL RELEASE OF SECURITY INTEREST IN INTELLECTUAL PROPERTY Recorded Jun 2, 2021
From: WILMINGTON TRUST, NATIONAL ASSOCIATION, AS SECURITY AGENT
To: COBHAM MISSION SYSTEMS DAVENPORT AAR INC.; COBHAM MISSION SYSTEMS DAVENPORT LSS INC.; COBHAM MISSION SYSTEMS ORCHARD PARK INC.
Reel/Frame 056461/0677 →
PARTIAL RELEASE OF SECURITY INTEREST IN INTELLECTUAL PROPERTY Recorded Jun 2, 2021
From: WILMINGTON TRUST, NATIONAL ASSOCIATION, AS SECURITY AGENT
To: COBHAM MISSION SYSTEMS DAVENPORT AAR INC.; COBHAM MISSION SYSTEMS DAVENPORT LSS INC.; COBHAM MISSION SYSTEMS ORCHARD PARK INC.
Reel/Frame 056461/0689 →
FIRST LIEN US INTELLECTUAL PROPERTY SECURITY AGREEMENT Recorded Jun 15, 2020
From: COBHAM MISSION SYSTEMS DAVENPORT AAR INC.; COBHAM MISSION SYSTEMS DAVENPORT LSS INC.; COBHAM MISSION SYSTEMS ORCHARD PARK INC.; COBHAM ADVANCED ELECTRONIC SOLUTIONS INC.; CHELTON AVIONICS, INC.
To: WILMINGTON TRUST, NATIONAL ASSOCIATION
Reel/Frame 052945/0547 →
SECOND LIEN US INTELLECTUAL PROPERTY SECURITY AGREEMENT Recorded Jun 15, 2020
From: COBHAM MISSION SYSTEMS DAVENPORT AAR INC.; COBHAM MISSION SYSTEMS DAVENPORT LSS INC.; COBHAM MISSION SYSTEMS ORCHARD PARK INC.; COBHAM ADVANCED ELECTRONIC SOLUTIONS INC.; CHELTON AVIONICS, INC.
To: WILMINGTON TRUST, NATIONAL ASSOCIATION
Reel/Frame 052945/0653 →
CHANGE OF NAME Recorded Aug 22, 2019
From: CARLETON LIFE SUPPORT SYSTEMS INC.
To: COBHAM MISSION SYSTEMS DAVENPORT LSS INC.
Reel/Frame 050139/0423 →
ASSIGNMENT OF ASSIGNOR'S INTEREST Recorded Apr 4, 2005
From: LITTON SYSTEMS, INC.
To: CARLETON LIFE SUPPORT SYSTEMS, INC.
Reel/Frame 016427/0532 →