Sliding member and piston ring
US-2018245200-A1 · Aug 30, 2018 · US
Seal assembly for gas turbine engine
US11560808B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-11560808-B2 |
| Application number | US-201916574235-A |
| Country | US |
| Kind code | B2 |
| Filing date | Sep 18, 2019 |
| Priority date | Sep 19, 2018 |
| Publication date | Jan 24, 2023 |
| Grant date | Jan 24, 2023 |
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- Title
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Abstract
Official abstract text for this publication.
A seal assembly for a gas turbine engine having a seal formed of a carbon material; and a seal seat positioned for rotation relative to the seal, wherein the seal and the seal seat each have a sealing surface which together define a sliding seal, and further having a carbon film on the sealing surface of the seal seat.
First claim
Opening claim text (preview).
What is claimed is: 1. A seal assembly for a gas turbine engine, comprising: a seal comprising a carbon material, wherein the seal comprises an electrographitic grade carbon; and a seal seat comprising a chromium carbide material, said seal seat being positioned for rotation relative to the seal, wherein the seal and the seal seat each have a sealing surface which together define a sliding seal, and further comprising a carbon film on the sealing surface of the seal seat over the chromium carbide material, wherein the carbon film is doped with a carbide-forming metal. 2. The seal assembly of claim 1 , wherein the carbon film comprises a DLC film having an sp2 content and an sp3 content, wherein the sp2 content is greater than the sp3 content. 3. The seal assembly of claim 2 , wherein the carbon film has a thickness of between 100 and 200 nm. 4. The seal assembly of claim 1 , wherein the carbide-forming metal is selected from the group consisting of tungsten, silicon, chromium, molybdenum and combinations thereof. 5. The seal assembly of claim 1 , wherein the carbide-forming metal is selected from the group consisting of tungsten, silicon and combinations thereof. 6. The seal assembly of claim 1 , wherein the sealing surface of the seal and the sealing surface of the seal seat have a coefficient of friction of less than 0.1. 7. A gas turbine engine, comprising: a rotational element and a stationary seal carrier; and the seal assembly of claim 1 , wherein the seal is carried by the seal carrier and the seal seat is mounted on the rotational element. 8. A method for making a seal assembly, comprising the steps of: positioning a seal relative to a seal seat, wherein the seal comprises an electrographitic grade carbon; and the seal seat comprises a chromium carbide material, said seal seat is positioned for rotation relative to the seal, wherein the seal and the seal seat each have a sealing surface which together define a sliding seal, and depositing a carbon film on the sealing surface of the seal seat over the chromium carbide material, wherein the carbon film is doped with a carbide-forming metal. 9. The method of claim 8 , wherein the depositing step is carried out before the positioning step. 10. The method of claim 8 , further comprising the step of rotating the seal seat relative to the seal whereby a carbon transfer film is deposited from the seal over the carbon film on the seal seat. 11. The method of claim 8 , wherein the carbon film is applied to the sealing surface of the seal seat by physical vapor deposition.
Assignees
Inventors
Classifications
Arrangement of seals · CPC title
- F01D11/005Primary
Sealing means between non relatively rotating elements · CPC title
Carbon, e.g. graphite · CPC title
Sliding surface consisting mainly of ceramics, cermets or hard carbon, e.g. diamond like carbon [DLC] · CPC title
in gas turbines · CPC title
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Frequently asked questions
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- What does patent US11560808B2 cover?
- A seal assembly for a gas turbine engine having a seal formed of a carbon material; and a seal seat positioned for rotation relative to the seal, wherein the seal and the seal seat each have a sealing surface which together define a sliding seal, and further having a carbon film on the sealing surface of the seal seat.
- Who is the assignee on this patent?
- United Technologies Corp, Raytheon Tech Corp
- What technology area does this patent fall under?
- Primary CPC classification F01D11/005. Mapped technology areas include Mechanical Engineering.
- When was this patent published?
- Publication date Tue Jan 24 2023 00:00:00 GMT+0000 (Coordinated Universal Time) (B2). Legal status and post-grant events are not shown on this page.
- What related patents are in patentsdb?
- We list 4 related publications on this page (citations in our corpus or others sharing the same primary CPC).