US3886647A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of making erosion resistant articles
Assignee: Ex-Cell-O Corp
•
Filing: 1974-04-25
•
Granted: 1975-06-03
•
Expires: 1994-04-25
Abstract
Abstract A method for making an airfoil or the like which involves positioning a first bimetallic sheet in a fixture having a contour corresponding to the desired airfoil contour, with the inner layer of the sheet being made of a metal which is less erosion resistant than the outer layer, positioning on the sheet a metal matrix core assembly, covering the resulting assembly with a second bimetallic sheet, the inner layers of both bimetallic sheets being the same as the matrix metal, welding together the edges of the two sheets to encase the core assembly, and diffusion bonding the metal sheets and core under heat and pressure.
Inventors
- 👤 John A Alexander
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 17:59
CPC Classifications
B; B23; B23K; B23K20/00; B23K20/02; B23K20/023
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
111 words
The method of making a shaped article which comprises positioning a first bi-metal sheet in a shaping means having a contour corresponding to the desired shape, the inner layer of said shape being made of metal less erosion resistant than the outer layer, forming a metal matrix core assembly over that first bi-metal sheet, covering the assembly with a covering sheet of the same type as said first bi-metal sheet, the inner layer of said bi-metal sheets corresponding to said matrix metal, welding together the edges of the first sheet and the covering sheet to encase the core assembly, and diffusion bonding said metal sheets and core under heat and pressure.
Claim 2
Independent Claim
111 words
The method of making a shaped article which comprises positioning a first bi-metal sheet in a shaping means having a contour corresponding to the desired shape, the inner layer of said shape being made of metal less erosion resistant than the outer layer, forming a metal matrix core assembly over that first bi-metal sheet, covering the assembly with a covering sheet of the same type as said first bi-metal sheet, the inner layer of said bi-metal sheets corresponding to said matrix metal, welding together the edges of the first sheet and the covering sheet to encase the core assembly, and diffusion bonding said metal sheets and core under heat and pressure.
Claim 3
Independent Claim
111 words
The method of making a shaped article which comprises positioning a first bi-metal sheet in a shaping means having a contour corresponding to the desired shape, the inner layer of said shape being made of metal less erosion resistant than the outer layer, forming a metal matrix core assembly over that first bi-metal sheet, covering the assembly with a covering sheet of the same type as said first bi-metal sheet, the inner layer of said bi-metal sheets corresponding to said matrix metal, welding together the edges of the first sheet and the covering sheet to encase the core assembly, and diffusion bonding said metal sheets and core under heat and pressure.
Claim 4
Independent Claim
111 words
The method of making a shaped article which comprises positioning a first bi-metal sheet in a shaping means having a contour corresponding to the desired shape, the inner layer of said shape being made of metal less erosion resistant than the outer layer, forming a metal matrix core assembly over that first bi-metal sheet, covering the assembly with a covering sheet of the same type as said first bi-metal sheet, the inner layer of said bi-metal sheets corresponding to said matrix metal, welding together the edges of the first sheet and the covering sheet to encase the core assembly, and diffusion bonding said metal sheets and core under heat and pressure.
Claim 5
Dependent Claim
24 words
The method of claim 1 in which each bi-metal sheet consists of an inner layer of aluminum and an outer layer of stainless steel.
Claim 6
Dependent Claim
24 words
The method of claim 1 in which each bi-metal sheet has an inner layer composed of titanium and an outer layer of stainless steel.
Claim 7
Independent Claim
135 words
The method of making an airfoil structure which comprises positioning a first bi-metal sheet in a shaping die, applying strips of a tape of fiber reinforced metal matrix in side-by-side relation and in overlying layers over said first bi-metal sheet to build up a desired contour for the core of said airfoil structure, diffusion bonding said strips to said first bi-metal sheet and to each other as the buildup of strips progresses, applying a second bi-metal sheet to the resulting diffusion bonded assembly, each of said bi-metal sheets having an inner surface composed of the matrix metal and an outer surface composed of a more erosion resistant metal, bonding the edges of the two bi-metal sheets together about the periphery of said core, and diffusioN bonding the entire structure so produced under heat and pressure.
Claim 8
Independent Claim
135 words
The method of making an airfoil structure which comprises positioning a first bi-metal sheet in a shaping die, applying strips of a tape of fiber reinforced metal matrix in side-by-side relation and in overlying layers over said first bi-metal sheet to build up a desired contour for the core of said airfoil structure, diffusion bonding said strips to said first bi-metal sheet and to each other as the buildup of strips progresses, applying a second bi-metal sheet to the resulting diffusion bonded assembly, each of said bi-metal sheets having an inner surface composed of the matrix metal and an outer surface composed of a more erosion resistant metal, bonding the edges of the two bi-metal sheets together about the periphery of said core, and diffusioN bonding the entire structure so produced under heat and pressure.
Claim 9
Dependent Claim
21 words
The method of claim 4 in which said inner surface consists of aluminum and said outer surface consists of stainless steel.
Claim 10
Dependent Claim
23 words
The method of claim 4 in which said inner surface is composed of titanium and said outer surface is composed of stainless steel.
Claim 11
Dependent Claim
33 words
A method as set forth in claim 1 in which the core assembly is constructed by alternately stacking metal foil sheets and filament mats cut and shaped to produce the desired airfoil contour.
Claim 12
Dependent Claim
41 words
A method in accordance with claim 7 in which the filament mats are preformed by bonding together reinforcing filaments in spaced relation by means of a synthetic resin and thereafter cutting and deforming the same to the required size and shape.
Claim 13
Dependent Claim
21 words
The method of claim 8 in which each of said mats is edge-welded to a metal foil sheet prior to stacking.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-06-02 | 1978-12-02 | 1979-06-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-06-02 | 1982-12-02 | 1983-06-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-06-02 | 1986-12-02 | 1987-06-03 | $7700.00 | Window Closed / Lapsed |