US4822248A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Rebuilt shrouded turbine blade and method of rebuilding the same
Assignee: METALLURGICAL INDUSTRIES Inc A CORP OF NJ
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Filing: 1987-04-15
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Granted: 1989-04-18
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Expires: 2007-04-15
Abstract
Abstract The shrouded turbine blade is provided with a wear resistant surface on the seals as well as along the abutment faces including the notched edges. The wear surfaces are characterized in being metallurgically bonded to the base material of the shroud without significant dilution by the base material. This is accomplished by using transparent plasma arc welding at a low amperage and a low temperature. The wear resistant surface can be of a material different from the base material of the shroud proper.
Inventors
- 👤 Timothy A. Wertz
- 👤 Gilbert A. Saltzman
- 👤 Ira L. Friedman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 00:18
CPC Classifications
B; B23; B23P; B23P6/00; B23P6/002; B23P6/007; F; F01; F01D; F01D5/00; F01D5/005; F01D5/12; F01D5/22; F01D5/225; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49316; Y10T29/49318; Y10T29/49718; Y10T29/49721; Y10T29/49723; Y10T29/49725; Y10T29/49726; Y10T29/49728; Y10T29/49746; Y10T29/4998; Y10T29/49993
Claims Analysis
Total Claims: 22
Claim 1
Independent Claim
114 words
A shrouded turbine engine blade comprising a blade root; an airfoil extending form said blade root; a shroud on said airfoil opposite said blade root, said shroud having a notch at each of two opposite ends and a projection on said opposite ends; and a metallurgically bonded wear resistant surface made from powdered metal and applied on at least one of said notches and said projections by a plasma transferred arc generated at a low amperage sufficient to melt and cast the powdered metal while holding the heat imparted to said shroud to a minimum and holding the dilution of the wear resistant surface by the base material of said shroud to a minimum.
Claim 2
Dependent Claim
114 words
A shrouded turbine engine blade comprising a blade root; an airfoil extending form said blade root; a shroud on said airfoil opposite said blade root, said shroud having a notch at each of two opposite ends and a projection on said opposite ends; and a metallurgically bonded wear resistant surface made from powdered metal and applied on at least one of said notches and said projections by a plasma transferred arc generated at a low amperage sufficient to melt and cast the powdered metal while holding the heat imparted to said shroud to a minimum and holding the dilution of the wear resistant surface by the base material of said shroud to a minimum.
Claim 3
Dependent Claim
27 words
A turbine blade as set forth in claim 1 wherein each wear resistant surface is of a thickness in the range of from 0.010 to 0.120 inches.
Claim 4
Dependent Claim
24 words
A turbine blade as set forth in claim 2 wherein each wear resistant surface is of a width of from 0.020 to 0.250 inches.
Claim 5
Dependent Claim
36 words
A turbine blade as set forth in claim 1 wherein each wear surface is formed of a nickel-base or cobalt base material, or of such an alloy with abrasive particles of a hard material distributed throughout.
Claim 6
Dependent Claim
101 words
A restored turbine engine blade comprising a blade root; a curved airfoil extending from said blade root; a shroud on said airfoil at a distal end, said shroud having at least one outwardly extending rib to define a seal, and an abutment face at each of two opposite ends defining a notch and a projection at each of said opposite ends; and a metallurgically bonded wear resistant overlay made from powdered metal and applied on at least one of said rib, said notches and said projections by a plasma transferred arc generated at an amperage of from 3 to 15 amps.
Claim 7
Dependent Claim
101 words
A restored turbine engine blade comprising a blade root; a curved airfoil extending from said blade root; a shroud on said airfoil at a distal end, said shroud having at least one outwardly extending rib to define a seal, and an abutment face at each of two opposite ends defining a notch and a projection at each of said opposite ends; and a metallurgically bonded wear resistant overlay made from powdered metal and applied on at least one of said rib, said notches and said projections by a plasma transferred arc generated at an amperage of from 3 to 15 amps.
Claim 8
Dependent Claim
24 words
A restored turbine blade as set forth in claim 5 wherein said overlay is of a thickness of from 0.010 inches to 0.120 inches.
Claim 9
Dependent Claim
33 words
A restored turbine blade as set forth in claim 5 wherein said airfoil and said shroud are made of a nickel-base alloy and said overlay is characterized in being a cast metal alloy.
Claim 10
Dependent Claim
36 words
A restored turbine blade as set forth in claim 5 wherein said overlay is characterized in being highly resistant to spalling and chipping and in having a minimum of dilution with said alloy of said shroud.
Claim 11
Dependent Claim
19 words
A restored turbine blade as set forth in claim 5 wherein said overlay is made of a nickel-base alloy.
Claim 12
Dependent Claim
22 words
A restored turbine blade as set forth in claim 5 wherein said overlay is made of a material different from said shroud.
Claim 13
Dependent Claim
19 words
A restored turbine blade as set forth in claim 10 wherein said overlay is made of a cobalt-base material.
Claim 14
Dependent Claim
32 words
A restored turbine blade as set forth in claim 5 wherein said airfoil and said shroud are made of cobalt-base alloy and said overlay is characterized in being a cast metal alloy.
Claim 15
Independent Claim
118 words
A method of rebuilding a shroud of an airfoil having at least one outwardly extending rib defining a seal, said method comprising the steps of creating a transferred plasma arc between an electrode and the rib; and feeding powdered metal particles into the arc for depositing a series of overlapping weld deposits on the rib to form a wear resistant layer thereon, said layer being metallurgically bonded to the rib and maintaining the transferred plasma arc at a low amperage sufficient to melt and cast the powdered metal while holding the heat imparted to the rib to a minimum and holding the dilution of the wear resistant layer by the base material of the rib to a minimum.
Claim 16
Independent Claim
118 words
A method of rebuilding a shroud of an airfoil having at least one outwardly extending rib defining a seal, said method comprising the steps of creating a transferred plasma arc between an electrode and the rib; and feeding powdered metal particles into the arc for depositing a series of overlapping weld deposits on the rib to form a wear resistant layer thereon, said layer being metallurgically bonded to the rib and maintaining the transferred plasma arc at a low amperage sufficient to melt and cast the powdered metal while holding the heat imparted to the rib to a minimum and holding the dilution of the wear resistant layer by the base material of the rib to a minimum.
Claim 17
Dependent Claim
24 words
A method as set forth in claim 13 wherein the arc is generated at an amperage of from about 3 amps to 8 amps.
Claim 18
Dependent Claim
23 words
A method as set forth in claim 13 wherein the wear resistant layer is of a thickness of from 0.010 to 0.120 inches.
Claim 19
Independent Claim
115 words
A method of rebuilding a shroud of an air foil having at least one notch thereon, said method comprising the steps of creating a transferred plasma arc between an electrode and the notch; and feeding powdered metal particles into the arc for depositing a series of overlapping weld deposits on the notch to form a wear resistant layer thereon, said layer being metallurgically bonded to the notch and maintaining the transferred plasma arc at a low amperage sufficient to melt and cast the powdered metal while holding the heat imparted to the rib to a minimum and holding the dilutoin of the wear resistant layer by the base material of the notch to a minimum.
Claim 20
Independent Claim
115 words
A method of rebuilding a shroud of an air foil having at least one notch thereon, said method comprising the steps of creating a transferred plasma arc between an electrode and the notch; and feeding powdered metal particles into the arc for depositing a series of overlapping weld deposits on the notch to form a wear resistant layer thereon, said layer being metallurgically bonded to the notch and maintaining the transferred plasma arc at a low amperage sufficient to melt and cast the powdered metal while holding the heat imparted to the rib to a minimum and holding the dilutoin of the wear resistant layer by the base material of the notch to a minimum.
Claim 21
Dependent Claim
23 words
A method as set forth in claim 16 wherein the arc is generated at an amperage of from 5 amps to 15 amps.
Claim 22
Dependent Claim
23 words
A method as set forth in claim 16 wherein the wear resistant layer is of a thickness of from 0.010 to 0.120 inches.
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) | 1992-04-17 | 1992-10-17 | 1993-04-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-04-17 | 1996-10-17 | 1997-04-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-04-17 | 2000-10-17 | 2001-04-18 | $7700.00 | Window Closed / Lapsed |