US4809990A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Brush seals of ceramic material for thermal turbomachines
Assignee: MTU Aero Engines AG
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Filing: 1986-07-31
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Granted: 1989-03-07
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Expires: 2006-07-31
Abstract
Abstract A brush seal for use in thermal turbomachines comprising bristles which consist of oxidic or non-oxidic ceramic fiber.
Inventors
- 👤 Herbert Merz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 21:06
CPC Classifications
F; F16; F16J; F16J15/00; F16J15/16; F16J15/32; F16J15/3284; F16J15/3288; A; A46; A46D; A46D3/00; A46D3/04; A46D3/05; A46D9/00; B; B65; B65H; B65H81/00; Y; Y10; Y10S; Y10S277/00; Y10S277/935; Y10S277/943
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
62 words
In a brush seal having bristles for sealing circumferential gaps in a thermal turbomachine, the improvement wherein the bristles of the brush seal consist of ceramic fiber consisting essentially of: non-oxidic Si 3 N 4 or SiC-based ceramic material; or oxidic ceramic material selected from the group consisting of α-Al 2 O 3 , δ-Al 2 O 3 and SiO 2 .
Claim 2
Dependent Claim
62 words
In a brush seal having bristles for sealing circumferential gaps in a thermal turbomachine, the improvement wherein the bristles of the brush seal consist of ceramic fiber consisting essentially of: non-oxidic Si 3 N 4 or SiC-based ceramic material; or oxidic ceramic material selected from the group consisting of α-Al 2 O 3 , δ-Al 2 O 3 and SiO 2 .
Claim 3
Dependent Claim
30 words
The improvement as claimed in claim 1 wherein said ceramic material consists essentially of, by weight, 5 to 30% SiO 2 , 2 to 15% C, and the remainder SiC.
Claim 4
Dependent Claim
35 words
The improvement as claimed in claim 1 wherein said ceramic material consists essentially of, by weight, 5 to 25% SiO 2 , 2 to 15% C, 2 to 15% TiO 2 and the remainder SiC.
Claim 5
Dependent Claim
24 words
The improvement as claimed in claim 1 in which the ceramic fibers are resilient and retain their resiliency at temperatures up to 1000° C.
References Cited (Backward Citations)
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Cited
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US3917150A
Cited
US4342712A
Cited
US4399232A
Cited
US4600202A
Cited
US4679619A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-03-06 | 1992-09-05 | 1993-03-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-03-06 | 1996-09-05 | 1997-03-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-03-06 | 2000-09-05 | 2001-03-07 | $7700.00 | Window Closed / Lapsed |