US4594053A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Housing for a fluid flow or jet engine
Assignee: MTU Aero Engines AG
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Filing: 1985-03-25
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Granted: 1986-06-10
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Expires: 2005-03-25
Abstract
Abstract A coolable housing wall for hot gas fluid flow engines, especially for a gas turbine of the air jet type, is provided on its radially inwardly facing surface with a carrier for a single cover layer forming a running-in coating. The cover layer is applied by thermal spraying to form a ceramic coating having a high heat and corrosion resistance. The single cover layer has a substantially uniform thickness and projects radially inwardly from the carrier, preferably by forming ridges facing the blade tips of a rotor in the housing. Such cover layer also has a high erosion resistance.
Inventors
- 👤 Joachim Sohngen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 17:27
CPC Classifications
F; F01; F01D; F01D11/00; F01D11/08; F01D11/12; F01D11/122; F01D11/125; F05; F05D; F05D2230/00; F05D2230/90; Y; Y02; Y02T; Y02T50/00; Y02T50/60; Y10; Y10S; Y10S277/00; Y10S277/93; Y10S277/935; Y10S277/943; Y10T; Y10T428/00; Y10T428/12; Y10T428/12493; Y10T428/12535; Y10T428/12611
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
178 words
A housing for a fluid flow engine, comprising a coolable housing wall means having a radially inwardly facing surface, a metallic rib carrier means including recesses being rigidly secured to said radially inwardly facing surface of said housing wall means, and a cover layer applied by thermal spraying to said wall surface and said ribs of the metallic rib carrier means, said cover layer comprising a rub-tolerant stabilized zirconium oxide forming a corrosion and errosion resistant ceramic material made of stabilized zirconium oxide powder of irregularly shaped, fine-grained particles which substantially completely fill said recesses, said particles covering said rib carrier means to form said cover layer as an uninterrupted coating intimately bonded by said thermal spraying to said metallic rib carrier means, said cover layer further forming relatively narrow ridges on the ribs of said rib carrier means, said ridges projecting above said ribs radially inwardly for directly facing blade tips of a rotor in said housing, whereby a gap between said housing means and said rotor may be maintained substantially constantly at a minimal gap width.
Claim 2
Dependent Claim
178 words
A housing for a fluid flow engine, comprising a coolable housing wall means having a radially inwardly facing surface, a metallic rib carrier means including recesses being rigidly secured to said radially inwardly facing surface of said housing wall means, and a cover layer applied by thermal spraying to said wall surface and said ribs of the metallic rib carrier means, said cover layer comprising a rub-tolerant stabilized zirconium oxide forming a corrosion and errosion resistant ceramic material made of stabilized zirconium oxide powder of irregularly shaped, fine-grained particles which substantially completely fill said recesses, said particles covering said rib carrier means to form said cover layer as an uninterrupted coating intimately bonded by said thermal spraying to said metallic rib carrier means, said cover layer further forming relatively narrow ridges on the ribs of said rib carrier means, said ridges projecting above said ribs radially inwardly for directly facing blade tips of a rotor in said housing, whereby a gap between said housing means and said rotor may be maintained substantially constantly at a minimal gap width.
Claim 3
Dependent Claim
16 words
A housing of claim 1, wherein said metallic rib carrier means is a honeycomb type structure.
Claim 4
Dependent Claim
33 words
The housing of claim 1, wherein said projecting ridges have a width approximately similar to the width of the ribs of said rib carrier means and a radial height greater than their width.
Claim 5
Dependent Claim
27 words
The housing of claim 1, wherein said projecting ridges have a radial height above said rib carrier means within the range of about 1 to 5 mm.
Claim 6
Dependent Claim
41 words
The housing of claim 1, wherein the recesses of said rib carrier means have a given depth, and wherein said protective layer has a radial thickness larger than said given depth so that said layer is thicker than said given depth.
Claim 7
Dependent Claim
21 words
The housing of claim 1, wherein said protective layer has a thickness in the range of about 1 to 15 mm.
Claim 8
Dependent Claim
49 words
The housing of claim 1, wherein said rib carrier means comprises rib elements defining said rib carrier recesses so that there is a defined spacing between two parallel rib elements, said rib elements having a radial dimension which corresponds approximately between one and one forth of said defined spacing.
Claim 9
Dependent Claim
12 words
The housing of claim 1, wherein said protective layer comprises metallic particles.
Claim 10
Dependent Claim
13 words
The housing of claim 1, wherein said protective layer comprises glass type particles.
Claim 11
Dependent Claim
18 words
The housing of claim 1, wherein said cover layer completely fills said recesses in said rib carrier means.
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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) | 1989-06-09 | 1989-12-09 | 1990-06-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-06-09 | 1993-12-09 | 1994-06-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-06-09 | 1997-12-09 | 1998-06-10 | $7700.00 | Window Closed / Lapsed |