Housing for a fluid flow or jet engine

• US 4,594,053 A
• Filed: 03/25/1985
• Issued: 06/10/1986
• Est. Priority Date: 04/10/1984
• Status: Expired due to Fees

• Current Assignee: MTU Motoren- und Turbinen-Union Muenchen GmbH
• Original Assignee: MTU Motoren- und Turbinen-Union Muenchen GmbH
• Inventors: Sohngen, Joachim
• Primary Examiner(s): Smith, Leonard E.
• Application Number:
  US06/715,494
• Time in Patent Office: 442 Days
• Field of Search: 415/200, 415/174, 415/197, 277/53, 428/593, 428/598, 428/632, 428/937, 428/116, 428/117, 428/118, 428/555, 427/34, 427/423
• US Class Current: 277/414
• CPC Class Codes: F01D 11/125 with a reinforcing structure
• CPC Class Codes: F05D 2230/90 Coating; Surface treatment manufacture with deposition of material F05D2230/30
• CPC Class Codes: Y02T 50/60 Efficient propulsion technologies, e.g. for aircraft
• CPC Class Codes: Y10S 277/93 Seal including heating or cooling feature
• CPC Class Codes: Y10S 277/943 Ceramic or glass
• CPC Class Codes: Y10T 428/12611 Oxide-containing component

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.

Claims

1. 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.

2. A housing of claim 1, wherein said metallic rib carrier means is a honeycomb type structure.

3. 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.

4. 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.

5. 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.

6. The housing of claim 1, wherein said protective layer has a thickness in the range of about 1 to 15 mm.

7. 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.

8. The housing of claim 1, wherein said protective layer comprises metallic particles.

9. The housing of claim 1, wherein said protective layer comprises glass type particles.

10. The housing of claim 1, wherein said cover layer completely fills said recesses in said rib carrier means.