US20140193664A1 - Recoating process and recoated turbine blade - Google Patents
Recoating process and recoated turbine blade Download PDFInfo
- Publication number
- US20140193664A1 US20140193664A1 US13/735,342 US201313735342A US2014193664A1 US 20140193664 A1 US20140193664 A1 US 20140193664A1 US 201313735342 A US201313735342 A US 201313735342A US 2014193664 A1 US2014193664 A1 US 2014193664A1
- Authority
- US
- United States
- Prior art keywords
- recoat
- thermal barrier
- turbine blade
- bond
- stripped
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Abandoned
Links
Images
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
- F01D5/00—Blades; Blade-carrying members; Heating, heat-insulating, cooling or antivibration means on the blades or the members
- F01D5/12—Blades
- F01D5/28—Selecting particular materials; Particular measures relating thereto; Measures against erosion or corrosion
- F01D5/288—Protective coatings for blades
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
- F01D5/00—Blades; Blade-carrying members; Heating, heat-insulating, cooling or antivibration means on the blades or the members
- F01D5/005—Repairing methods or devices
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
- F05D—INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
- F05D2230/00—Manufacture
- F05D2230/30—Manufacture with deposition of material
- F05D2230/31—Layer deposition
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/12—All metal or with adjacent metals
- Y10T428/12493—Composite; i.e., plural, adjacent, spatially distinct metal components [e.g., layers, joint, etc.]
- Y10T428/12535—Composite; i.e., plural, adjacent, spatially distinct metal components [e.g., layers, joint, etc.] with additional, spatially distinct nonmetal component
- Y10T428/12611—Oxide-containing component
- Y10T428/12618—Plural oxides
Definitions
- the present invention is directed to manufacturing processes and manufactured components. More particularly, the present invention is directed to recoating turbine blades and recoated turbine blades.
- Gas turbine blades are affected by operational use. Extremely high temperatures and long cycle times result in properties that can benefit from repair or replacement. For example, extremely high temperatures and exposure to certain materials, such as fuel, can result in oxidation, can result in fatigue, can result in damage, or other undesirable features. To reduce or eliminate such effects, turbine blades are replaced or repaired at periodic intervals.
- thermal barrier coatings on a turbine blade can be undesirable aesthetically.
- turbine blades with multiple thermal barrier coatings may have regions that look different from other regions. Individuals may improperly perceive that such differences relate to the quality or other properties of the turbine blade. Such improper perceptions can result in decreased use and/or sales of such turbine blades.
- a recoating process includes providing a coated turbine blade, then removing a portion of the thermal barrier coating system to form a partially-stripped turbine blade having a stripped region, then applying a bond recoat to the stripped region of the partially-stripped turbine blade, and then applying a thermal barrier recoat to the bond recoat to form a recoated turbine blade.
- the coated turbine blade has a thermal barrier coating system positioned on a substrate.
- a recoating process includes providing a coated turbine blade having a thermal barrier coating system positioned on a substrate, then removing a portion of the thermal barrier coating system to form a partially-stripped turbine blade having a stripped region, a bond coating portion, a thermal barrier coating portion, and a stepped configuration, then applying a bond recoat to the stripped region of the partially-stripped turbine blade, and then applying a thermal barrier recoat to the bond recoat to form a recoated turbine blade.
- the recoated turbine blade includes the bond coating portion abutting the bond recoat, the thermal barrier coating portion abutting the thermal barrier recoat, and the stepped configuration.
- a recoated turbine blade in another exemplary embodiment, includes a substrate, a bond coat portion abutting a bond recoat, a thermal barrier coating portion abutting a thermal barrier recoat, a stepped configuration of the bond coating portion, the bond coating, the thermal barrier portion, and the thermal barrier coating on the substrate.
- the bond coat portion and the thermal barrier coating portion include post-operational features.
- FIG. 1 is a flow diagram of an exemplary recoating process.
- FIG. 2 is a schematic view of a thermal barrier coating system of a coated turbine blade during a removing step of an exemplary recoating process according to the disclosure.
- FIG. 3 is a schematic view of the coated turbine blade of FIG. 2 .
- FIG. 4 is a schematic view of a thermal barrier coating system of a coated turbine blade during a removing step of an exemplary recoating process according to the disclosure.
- FIG. 5 is a schematic view of the coated turbine blade of FIG. 4 .
- FIG. 6 is a schematic view of a thermal barrier coating system of a coated turbine blade during a recoating step of an exemplary recoating process according to the disclosure.
- FIG. 7 is a schematic view of the coated turbine blade of FIG. 6 .
- FIG. 8 is a schematic view of a thermal barrier coating system of a coated turbine blade during a recoating step of an exemplary recoating process according to the disclosure.
- FIG. 9 is a schematic view of the coated turbine blade of FIG. 8 .
- Embodiments of the present disclosure permit operational downtime to be reduced, permit selective repair and replacement of turbine blades, permit conserved use of materials in recoating turbine blades, permit materials to be inspected after removal of a thermal barrier coating and/or bond coat prior to recoating (for example, permitting inspection of a base material), permit damage from complete stripping to be reduced or eliminated, or a combination thereof.
- FIG. 1 schematically shows a recoating process 100 .
- the recoating process 100 includes providing a coated turbine blade 201 (step 102 ), as is further described in the embodiments shown in FIGS. 2-5 , removing a portion of a thermal barrier coating system 203 (step 104 ), as is further described in the embodiments shown in FIGS. 2-5 , applying a bond recoat 601 (step 106 ), as is further described in the embodiments shown in FIGS. 6-7 , and applying a thermal barrier recoat 801 to the bond recoat 601 (step 108 ), as is further described in the embodiments shown in FIGS. 8-9 .
- the coated turbine blade 201 is any suitable blade, bucket, vane, or air foil. Referring to FIG. 2 , the coated turbine blade 201 has a thermal barrier coating system 203 positioned on a substrate 205 .
- the substrate 205 is any suitable metal material, metallic material, alloy, superalloy, or combination thereof. Suitable alloys include, but are not limited to, nickel-based alloys and cobalt-based alloys.
- the thermal barrier coating system 203 is any suitable material(s) capable of providing thermal resistance for the coated turbine blade 201 .
- the thermal barrier coating system 203 includes a bond coating 202 and a thermal barrier coating 204 .
- the bond coat 202 includes one or more bond coat materials, such as, MCrAlY (where M is a metal element), NiCrAlY, CoNiCrAlY, FeNiCrAlY, or a combination thereof.
- the thermal barrier coating 204 includes ceramics, yttria-stabilized zirconia, gadolinium zirconate, rare earth zirconates, or a combination thereof.
- the removing of the portion of the thermal barrier coating 203 forms a partially-stripped turbine blade 209 having a stripped region 211 , for example, as is shown in FIGS. 2 and 4 .
- the term “partially-stripped” refers to having a portion but not all of the thermal barrier coating system 203 being removed.
- the portion includes part or all of the thermal barrier coating 204 .
- the portion includes part of the bond coating 202 .
- the removing (step 104 ) is by a stripping method, for example, water-jet stripping, grit-blast stripping, acid stripping, or a combination thereof.
- the removing (step 104 ) is a single-step process or a multiple-step process (for example, with an individual step for stripping the all or a portion of thermal barrier coating portion 204 and an individual step for stripping a portion of the bond coating 202 ).
- the removing (step 104 ) is performed without removal of the coated turbine blade 201 from a turbine system (not shown) or after removal of the coated turbine blade 201 , such as, a power generation system or a turbine engine.
- the stripped region 211 extends into the partially-stripped turbine blade 209 , for example, into a thermal barrier coating portion 207 of the partially-stripped turbine blade 209 and a bond coat portion 213 of the partially-stripped turbine blade 209 .
- the stripped region 211 has a stepped configuration, for example, as a plurality of cascading layers arranged in a step-like manner.
- the partially-stripped turbine blade 209 includes the bond coat portion 213 and the thermal barrier coating portion 207 prior to the applying of the bond recoat 601 (step 106 ) (as shown if FIGS. 6-7 ) and the applying of the thermal barrier recoat 801 (step 108 ) (as shown in FIGS. 8-9 ).
- the partially-stripped turbine blade 209 includes the bond coat portion 213 and is substantially devoid of the thermal barrier coating portion 207 (see FIGS. 2-3 ) and/or the thermal barrier coating 204 of the thermal barrier coating system 203 prior to the applying of the bond recoat 601 (step 106 ) and applying of the thermal barrier recoat 801 (step 108 ).
- the method 100 includes one or more inspection steps (not shown).
- the inspection steps are prior to the removing (step 104 ) and/or after the removing (step 104 ) but prior to the applying of the bond recoat 601 (step 106 ).
- the one or more inspection steps are by any suitable inspection techniques. Suitable techniques include, but are not limited to, non-destructive techniques and destructive techniques.
- the one or more inspection steps identify regions to be removed and/or recoated, for example, due to identifiable surface features.
- the bond recoat 601 and the thermal barrier recoat 801 are applied to the partially-stripped turbine blade 209 to predetermined regions by any suitable processes.
- the bond recoat 601 includes material similar to, compatible with, or identical to the bond coating 202 .
- the thermal barrier recoat 801 includes material similar to, compatible with, or identical to the thermal barrier coating 204 .
- Suitable processes for applying the bond recoat 601 and/or the thermal barrier recoat 801 include, but are not limited to, air plasma spray, high-velocity oxy-fuel spray, suspension thermal spray, chemical vapor deposition, electron beam physical vapor deposition, physical vapor deposition, other suitable application processes, or a combination thereof.
- the applying of the bond recoat 601 is to the stripped region 211 of the partially-stripped turbine blade 209 .
- the applying of the bond recoat 601 includes applying a first bond recoat to the substrate and applying a second bond recoat to the first bond recoat. Any suitable number of recoat steps are used.
- the applying of the bond recoat 601 (step 106 ) is devoid of masking.
- the applying of the bond recoat 601 (step 106 ) to the partially-stripped turbine blade 209 does not apply the bond recoat 601 outside of the stripped region 211 of the partially-stripped turbine blade 209 .
- the applying of the bond recoat 601 (step 106 ) to the partially-stripped turbine blade 209 applies the bond recoat 601 outside of the stripped region 211 of the partially-stripped turbine blade 209 .
- the applying of the thermal barrier recoat 801 (step 108 ) forms a recoated turbine blade 901 .
- the applying of the thermal barrier recoat 801 (step 108 ) is devoid of masking.
- the applying of the thermal barrier recoat 801 (step 108 ) to the partially-stripped turbine blade 209 does not apply the thermal barrier recoat 801 outside of the stripped region 211 of the partially-stripped turbine blade 209 .
- the applying of the thermal barrier recoat 801 (step 108 ) to the partially-stripped turbine blade 209 applies the thermal barrier recoat 801 outside of the stripped region 211 of the partially-stripped turbine blade 209 .
- the recoated turbine blade 901 is formed.
- the recoated turbine blade 901 includes the bond recoat 601 (see FIG. 8 ), and the bond recoat 601 abuts the bond coating portion 213 (see FIG. 8 ) of the thermal barrier coating system 203 .
- the bond coating portion 213 differs from the bond recoat 601 by being post-operational, thereby having been oxidized, heat-exposed (for example, to a temperature above 1,500° F.), fuel-exposed, otherwise impacted by operational use, or a combination thereof.
- the recoated turbine blade 901 includes the thermal barrier recoat 801 , and the thermal barrier recoat 801 abuts the thermal barrier coating portion 207 of the thermal barrier coating system 203 .
- the thermal barrier coating portion 207 differs from the thermal barrier recoat 801 by being post-operational, thereby having been oxidized, heat-exposed (for example, to a temperature above 1,500° F.), fuel-exposed, otherwise impacted by operational use, or a combination thereof.
- the arrangement within the recoated turbine blade 901 of the bond coat portion 213 , the bond recoat 601 , the thermal barrier coating portion 207 (if present), and the thermal barrier recoat 801 is any suitable configuration.
- Suitable configurations include, but are not limited to, a stepped configuration as is described above, an overlapping configuration, a tapered configuration with a blending of materials between layers, having mismatched layers (for example, the bond coat portion 213 and the bond recoat 601 being slightly out of relative alignment and/or the thermal barrier coating portion 207 and the thermal barrier recoat 801 being slightly out of relative alignment), any other suitable configuration, or a combination thereof.
Abstract
Recoating process and recoated turbine blade are disclosed. The recoating process includes providing a coated turbine blade, then removing a portion of the thermal barrier coating system to form a partially-stripped turbine blade, then applying a bond recoat to the stripped region of the partially-stripped turbine blade; and then applying a thermal barrier recoat to the bond recoat to form a recoated turbine blade. The recoated turbine blade comprises the bond coating portion abutting the bond recoat, the thermal barrier coating portion abutting the thermal barrier recoat, and the stepped configuration. The coated turbine blade has a thermal barrier coating system positioned on a substrate. The partially-stripped turbine blade has a stripped region, a bond coating portion, a thermal barrier coating portion, and a stepped configuration.
Description
- The present invention is directed to manufacturing processes and manufactured components. More particularly, the present invention is directed to recoating turbine blades and recoated turbine blades.
- Gas turbine blades are affected by operational use. Extremely high temperatures and long cycle times result in properties that can benefit from repair or replacement. For example, extremely high temperatures and exposure to certain materials, such as fuel, can result in oxidation, can result in fatigue, can result in damage, or other undesirable features. To reduce or eliminate such effects, turbine blades are replaced or repaired at periodic intervals.
- Replacement of turbine blades can be expensive. Removal of the turbine blades for replacement from service can result in operational downtime that can reduce overall operational efficiency. As such, any reduction of such downtime can result in substantial improvements in overall operational efficiency of turbine systems utilizing turbine blades. Similarly, full stripping of coatings on turbine blades can be expensive due to time and materials expended in the stripping process and the recoating process.
- Also, using more than one thermal barrier coating on a turbine blade can be undesirable aesthetically. For example, turbine blades with multiple thermal barrier coatings may have regions that look different from other regions. Individuals may improperly perceive that such differences relate to the quality or other properties of the turbine blade. Such improper perceptions can result in decreased use and/or sales of such turbine blades.
- A recoating process and recoated turbine blade that do not suffer from one or more of the above drawbacks would be desirable in the art.
- In an exemplary embodiment, a recoating process includes providing a coated turbine blade, then removing a portion of the thermal barrier coating system to form a partially-stripped turbine blade having a stripped region, then applying a bond recoat to the stripped region of the partially-stripped turbine blade, and then applying a thermal barrier recoat to the bond recoat to form a recoated turbine blade. The coated turbine blade has a thermal barrier coating system positioned on a substrate.
- In another exemplary embodiment, a recoating process includes providing a coated turbine blade having a thermal barrier coating system positioned on a substrate, then removing a portion of the thermal barrier coating system to form a partially-stripped turbine blade having a stripped region, a bond coating portion, a thermal barrier coating portion, and a stepped configuration, then applying a bond recoat to the stripped region of the partially-stripped turbine blade, and then applying a thermal barrier recoat to the bond recoat to form a recoated turbine blade. The recoated turbine blade includes the bond coating portion abutting the bond recoat, the thermal barrier coating portion abutting the thermal barrier recoat, and the stepped configuration.
- In another exemplary embodiment, a recoated turbine blade includes a substrate, a bond coat portion abutting a bond recoat, a thermal barrier coating portion abutting a thermal barrier recoat, a stepped configuration of the bond coating portion, the bond coating, the thermal barrier portion, and the thermal barrier coating on the substrate. The bond coat portion and the thermal barrier coating portion include post-operational features.
- Other features and advantages of the present invention will be apparent from the following more detailed description of the preferred embodiment, taken in conjunction with the accompanying drawings which illustrate, by way of example, the principles of the invention.
-
FIG. 1 is a flow diagram of an exemplary recoating process. -
FIG. 2 is a schematic view of a thermal barrier coating system of a coated turbine blade during a removing step of an exemplary recoating process according to the disclosure. -
FIG. 3 is a schematic view of the coated turbine blade ofFIG. 2 . -
FIG. 4 is a schematic view of a thermal barrier coating system of a coated turbine blade during a removing step of an exemplary recoating process according to the disclosure. -
FIG. 5 is a schematic view of the coated turbine blade ofFIG. 4 . -
FIG. 6 is a schematic view of a thermal barrier coating system of a coated turbine blade during a recoating step of an exemplary recoating process according to the disclosure. -
FIG. 7 is a schematic view of the coated turbine blade ofFIG. 6 . -
FIG. 8 is a schematic view of a thermal barrier coating system of a coated turbine blade during a recoating step of an exemplary recoating process according to the disclosure. -
FIG. 9 is a schematic view of the coated turbine blade ofFIG. 8 . - Wherever possible, the same reference numbers will be used throughout the drawings to represent the same parts.
- Provided is an exemplary recoating process and recoated turbine blade. Embodiments of the present disclosure, for example, in comparison to processes and coated articles without partial stripping and partial recoating, permit operational downtime to be reduced, permit selective repair and replacement of turbine blades, permit conserved use of materials in recoating turbine blades, permit materials to be inspected after removal of a thermal barrier coating and/or bond coat prior to recoating (for example, permitting inspection of a base material), permit damage from complete stripping to be reduced or eliminated, or a combination thereof.
-
FIG. 1 schematically shows arecoating process 100. Therecoating process 100 includes providing a coated turbine blade 201 (step 102), as is further described in the embodiments shown inFIGS. 2-5 , removing a portion of a thermal barrier coating system 203 (step 104), as is further described in the embodiments shown inFIGS. 2-5 , applying a bond recoat 601 (step 106), as is further described in the embodiments shown inFIGS. 6-7 , and applying a thermal barrier recoat 801 to the bond recoat 601 (step 108), as is further described in the embodiments shown inFIGS. 8-9 . - The coated
turbine blade 201 is any suitable blade, bucket, vane, or air foil. Referring toFIG. 2 , the coatedturbine blade 201 has a thermalbarrier coating system 203 positioned on asubstrate 205. Thesubstrate 205 is any suitable metal material, metallic material, alloy, superalloy, or combination thereof. Suitable alloys include, but are not limited to, nickel-based alloys and cobalt-based alloys. - The thermal
barrier coating system 203 is any suitable material(s) capable of providing thermal resistance for the coatedturbine blade 201. In one embodiment, the thermalbarrier coating system 203 includes abond coating 202 and athermal barrier coating 204. Thebond coat 202 includes one or more bond coat materials, such as, MCrAlY (where M is a metal element), NiCrAlY, CoNiCrAlY, FeNiCrAlY, or a combination thereof. Thethermal barrier coating 204 includes ceramics, yttria-stabilized zirconia, gadolinium zirconate, rare earth zirconates, or a combination thereof. - The removing of the portion of the thermal barrier coating 203 (step 104) forms a partially-stripped
turbine blade 209 having a strippedregion 211, for example, as is shown inFIGS. 2 and 4 . As used herein, the term “partially-stripped” refers to having a portion but not all of the thermalbarrier coating system 203 being removed. The portion includes part or all of thethermal barrier coating 204. In one embodiment, the portion includes part of thebond coating 202. In one embodiment, the removing (step 104) is by a stripping method, for example, water-jet stripping, grit-blast stripping, acid stripping, or a combination thereof. The removing (step 104) is a single-step process or a multiple-step process (for example, with an individual step for stripping the all or a portion of thermalbarrier coating portion 204 and an individual step for stripping a portion of the bond coating 202). In one embodiment, the removing (step 104) is performed without removal of the coatedturbine blade 201 from a turbine system (not shown) or after removal of the coatedturbine blade 201, such as, a power generation system or a turbine engine. - The stripped
region 211 extends into the partially-strippedturbine blade 209, for example, into a thermalbarrier coating portion 207 of the partially-strippedturbine blade 209 and abond coat portion 213 of the partially-strippedturbine blade 209. In one embodiment, the strippedregion 211 has a stepped configuration, for example, as a plurality of cascading layers arranged in a step-like manner. - As shown in
FIGS. 2-3 , in one embodiment, the partially-strippedturbine blade 209 includes thebond coat portion 213 and the thermalbarrier coating portion 207 prior to the applying of the bond recoat 601 (step 106) (as shown ifFIGS. 6-7 ) and the applying of the thermal barrier recoat 801 (step 108) (as shown inFIGS. 8-9 ). As is shown inFIGS. 4-5 , in one embodiment, the partially-strippedturbine blade 209 includes thebond coat portion 213 and is substantially devoid of the thermal barrier coating portion 207 (seeFIGS. 2-3 ) and/or thethermal barrier coating 204 of the thermalbarrier coating system 203 prior to the applying of the bond recoat 601 (step 106) and applying of the thermal barrier recoat 801 (step 108). - In one embodiment, the
method 100 includes one or more inspection steps (not shown). The inspection steps are prior to the removing (step 104) and/or after the removing (step 104) but prior to the applying of the bond recoat 601 (step 106). The one or more inspection steps are by any suitable inspection techniques. Suitable techniques include, but are not limited to, non-destructive techniques and destructive techniques. The one or more inspection steps identify regions to be removed and/or recoated, for example, due to identifiable surface features. - The
bond recoat 601 and the thermal barrier recoat 801 are applied to the partially-strippedturbine blade 209 to predetermined regions by any suitable processes. The bond recoat 601 includes material similar to, compatible with, or identical to thebond coating 202. The thermal barrier recoat 801 includes material similar to, compatible with, or identical to thethermal barrier coating 204. Suitable processes for applying thebond recoat 601 and/or the thermal barrier recoat 801 include, but are not limited to, air plasma spray, high-velocity oxy-fuel spray, suspension thermal spray, chemical vapor deposition, electron beam physical vapor deposition, physical vapor deposition, other suitable application processes, or a combination thereof. - As shown in
FIGS. 6-7 , the applying of the bond recoat 601 (step 106) is to the strippedregion 211 of the partially-strippedturbine blade 209. In one embodiment, the applying of the bond recoat 601 (step 106) includes applying a first bond recoat to the substrate and applying a second bond recoat to the first bond recoat. Any suitable number of recoat steps are used. In one embodiment, the applying of the bond recoat 601 (step 106) is devoid of masking. In one embodiment, the applying of the bond recoat 601 (step 106) to the partially-strippedturbine blade 209 does not apply thebond recoat 601 outside of the strippedregion 211 of the partially-strippedturbine blade 209. In another embodiment, the applying of the bond recoat 601 (step 106) to the partially-strippedturbine blade 209 applies thebond recoat 601 outside of the strippedregion 211 of the partially-strippedturbine blade 209. - As shown in
FIGS. 8-9 , the applying of the thermal barrier recoat 801 (step 108) forms a recoatedturbine blade 901. In one embodiment, the applying of the thermal barrier recoat 801 (step 108) is devoid of masking. In one embodiment, the applying of the thermal barrier recoat 801 (step 108) to the partially-strippedturbine blade 209 does not apply the thermal barrier recoat 801 outside of the strippedregion 211 of the partially-strippedturbine blade 209. In another embodiment, the applying of the thermal barrier recoat 801 (step 108) to the partially-strippedturbine blade 209 applies the thermal barrier recoat 801 outside of the strippedregion 211 of the partially-strippedturbine blade 209. - After the applying of the bond recoat 601 (step 106) and the applying of the thermal barrier recoat 801 (step 108), the recoated
turbine blade 901 is formed. In one embodiment, the recoatedturbine blade 901 includes the bond recoat 601 (seeFIG. 8 ), and thebond recoat 601 abuts the bond coating portion 213 (seeFIG. 8 ) of the thermalbarrier coating system 203. In a further embodiment, thebond coating portion 213 differs from thebond recoat 601 by being post-operational, thereby having been oxidized, heat-exposed (for example, to a temperature above 1,500° F.), fuel-exposed, otherwise impacted by operational use, or a combination thereof. - In one embodiment, the recoated
turbine blade 901 includes the thermal barrier recoat 801, and the thermal barrier recoat 801 abuts the thermalbarrier coating portion 207 of the thermalbarrier coating system 203. In a further embodiment, the thermalbarrier coating portion 207 differs from the thermal barrier recoat 801 by being post-operational, thereby having been oxidized, heat-exposed (for example, to a temperature above 1,500° F.), fuel-exposed, otherwise impacted by operational use, or a combination thereof. - The arrangement within the recoated
turbine blade 901 of thebond coat portion 213, thebond recoat 601, the thermal barrier coating portion 207 (if present), and the thermal barrier recoat 801 is any suitable configuration. Suitable configurations include, but are not limited to, a stepped configuration as is described above, an overlapping configuration, a tapered configuration with a blending of materials between layers, having mismatched layers (for example, thebond coat portion 213 and thebond recoat 601 being slightly out of relative alignment and/or the thermalbarrier coating portion 207 and the thermal barrier recoat 801 being slightly out of relative alignment), any other suitable configuration, or a combination thereof. - While the invention has been described with reference to a preferred embodiment, it will be understood by those skilled in the art that various changes may be made and equivalents may be substituted for elements thereof without departing from the scope of the invention. In addition, many modifications may be made to adapt a particular situation or material to the teachings of the invention without departing from the essential scope thereof. Therefore, it is intended that the invention not be limited to the particular embodiment disclosed as the best mode contemplated for carrying out this invention, but that the invention will include all embodiments falling within the scope of the appended claims.
Claims (20)
1. A recoating process, comprising:
providing a coated turbine blade, the coated turbine blade having a thermal barrier coating system positioned on a substrate; then
removing a portion of the thermal barrier coating system to form a partially-stripped turbine blade having a stripped region; then
applying a bond recoat to the stripped region of the partially-stripped turbine blade; and then
applying a thermal barrier recoat to the bond recoat to form a recoated turbine blade.
2. The recoating process of claim 1 , wherein the thermal barrier coating system includes a thermal barrier coating and a bond coat.
3. The recoating process of claim 1 , wherein the removing is by water-jet stripping.
4. The recoating process of claim 1 , wherein the partially-stripped turbine blade comprises a bond coat portion and a thermal barrier coating portion prior to the applying of the bond recoat and the applying of the thermal barrier recoat.
5. The recoating process of claim 1 , wherein the partially-stripped turbine blade comprises a bond coat portion and is substantially devoid of a thermal barrier coating of the thermal barrier coating system prior to the applying of the bond recoat and applying of the thermal barrier recoat.
6. The recoating process of claim 1 , wherein the partially-stripped turbine blade has a stepped configuration.
7. The recoating process of claim 1 , comprising inspecting the partially-stripped turbine blade prior to applying the bond recoat.
8. The recoating process of claim 1 , wherein the applying of the bond recoat to the partially-stripped turbine blade includes applying a first bond recoat to the substrate and applying a second bond recoat to the first bond recoat.
9. The recoating process of claim 1 , wherein the applying of the bond recoat is devoid of masking.
10. The recoating process of claim 1 , wherein the applying of the bond recoat to the partially-stripped turbine blade does not apply the bond recoat outside of the stripped region of the partially-stripped turbine blade.
11. The recoating process of claim 1 , wherein the applying of the bond recoat to the partially-stripped turbine blade applies the bond recoat outside of the stripped region of the partially-stripped turbine blade.
12. The recoating process of claim 1 , wherein the applying of the thermal barrier recoat is devoid of masking.
13. The recoating process of claim 1 , wherein the applying of the thermal barrier recoat to the partially-stripped turbine blade does not apply the thermal barrier recoat outside of the stripped region of the partially-stripped turbine blade.
14. The recoating process of claim 1 , wherein the applying of the thermal barrier recoat to the partially-stripped turbine blade applies the thermal barrier recoat outside of the stripped region of the partially-stripped turbine blade.
15. The recoating process of claim 1 , wherein the recoated turbine blade comprises the bond recoat, and the bond recoat abuts a bond coating portion of the thermal barrier coating system.
16. The recoating process of claim 1 , wherein the recoated turbine blade comprises the thermal barrier recoat, and the thermal barrier recoat abuts a thermal barrier coating portion of the thermal barrier coating system.
17. The recoating process of claim 1 , wherein the recoated turbine blade has a stepped configuration.
18. The recoating process of claim 1 , wherein the removing of the portion of the thermal barrier coating system from the coated turbine blade is performed without removal of the coated turbine blade from a turbine system.
19. A recoating process, comprising:
providing a coated turbine blade, the coated turbine blade having a thermal barrier coating system positioned on a substrate; then
removing a portion of the thermal barrier coating system to form a partially-stripped turbine blade having a stripped region, a bond coating portion, a thermal barrier coating portion, and a stepped configuration; then
applying a bond recoat to the stripped region of the partially-stripped turbine blade; and then
applying a thermal barrier recoat to the bond recoat to form a recoated turbine blade;
wherein the recoated turbine blade comprises the bond coating portion abutting the bond recoat, the thermal barrier coating portion abutting the thermal barrier recoat, and the stepped configuration.
20. A recoated turbine blade, comprising:
a substrate;
a bond coat portion abutting a bond recoat;
a thermal barrier coating portion abutting a thermal barrier recoat; and
a stepped configuration of the bond coating portion, the bond coating, the thermal barrier portion, and the thermal barrier coating on the substrate;
wherein the bond coat portion and the thermal barrier coating portion include post-operational features.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US13/735,342 US20140193664A1 (en) | 2013-01-07 | 2013-01-07 | Recoating process and recoated turbine blade |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US13/735,342 US20140193664A1 (en) | 2013-01-07 | 2013-01-07 | Recoating process and recoated turbine blade |
Publications (1)
Publication Number | Publication Date |
---|---|
US20140193664A1 true US20140193664A1 (en) | 2014-07-10 |
Family
ID=51061175
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US13/735,342 Abandoned US20140193664A1 (en) | 2013-01-07 | 2013-01-07 | Recoating process and recoated turbine blade |
Country Status (1)
Country | Link |
---|---|
US (1) | US20140193664A1 (en) |
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20160298467A1 (en) * | 2013-11-18 | 2016-10-13 | United Technologies Corporation | Article having variable coating |
EP3162917A1 (en) * | 2015-10-28 | 2017-05-03 | General Electric Company | Methods of repairing a thermal barrier coating of a gas turbine component and the resulting components |
US20180154490A1 (en) * | 2016-12-02 | 2018-06-07 | General Electric Company | Motorized apparatus for use with rotary machines |
US10494926B2 (en) | 2017-08-28 | 2019-12-03 | General Electric Company | System and method for maintaining machines |
US10858725B2 (en) | 2017-06-26 | 2020-12-08 | Rolls-Royce Corporation | High density bond coat for ceramic or ceramic matrix composites |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6827969B1 (en) * | 2003-12-12 | 2004-12-07 | General Electric Company | Field repairable high temperature smooth wear coating |
US20040256504A1 (en) * | 2003-06-23 | 2004-12-23 | General Electric Company | Process of selectively removing layers of a thermal barrier coating system |
US20050241148A1 (en) * | 2004-04-28 | 2005-11-03 | Siemens Westinghouse Power Corporation | Thermally insulating layer incorporating a distinguishing agent and method for inspecting the same |
US7309512B2 (en) * | 2006-04-04 | 2007-12-18 | Siemens Power Generation, Inc. | Method of repairing an article having a bondcoat and a topcoat |
US20080085395A1 (en) * | 2005-04-07 | 2008-04-10 | Alstom Technology Ltd | Method for repairing or renewing cooling holes of a coated component of a gas turbine |
-
2013
- 2013-01-07 US US13/735,342 patent/US20140193664A1/en not_active Abandoned
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20040256504A1 (en) * | 2003-06-23 | 2004-12-23 | General Electric Company | Process of selectively removing layers of a thermal barrier coating system |
US6827969B1 (en) * | 2003-12-12 | 2004-12-07 | General Electric Company | Field repairable high temperature smooth wear coating |
US20050241148A1 (en) * | 2004-04-28 | 2005-11-03 | Siemens Westinghouse Power Corporation | Thermally insulating layer incorporating a distinguishing agent and method for inspecting the same |
US20080085395A1 (en) * | 2005-04-07 | 2008-04-10 | Alstom Technology Ltd | Method for repairing or renewing cooling holes of a coated component of a gas turbine |
US7309512B2 (en) * | 2006-04-04 | 2007-12-18 | Siemens Power Generation, Inc. | Method of repairing an article having a bondcoat and a topcoat |
Cited By (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20160298467A1 (en) * | 2013-11-18 | 2016-10-13 | United Technologies Corporation | Article having variable coating |
EP3162917A1 (en) * | 2015-10-28 | 2017-05-03 | General Electric Company | Methods of repairing a thermal barrier coating of a gas turbine component and the resulting components |
US20170122561A1 (en) * | 2015-10-28 | 2017-05-04 | General Electric Company | Methods of repairing a thermal barrier coating of a gas turbine component and the resulting components |
CN107043935A (en) * | 2015-10-28 | 2017-08-15 | 通用电气公司 | Repair the method and the component of gained of the thermal shield coating of gas turbine components |
US20180154490A1 (en) * | 2016-12-02 | 2018-06-07 | General Electric Company | Motorized apparatus for use with rotary machines |
US10717166B2 (en) * | 2016-12-02 | 2020-07-21 | General Electric Company | Motorized apparatus for use with rotary machines |
US10858725B2 (en) | 2017-06-26 | 2020-12-08 | Rolls-Royce Corporation | High density bond coat for ceramic or ceramic matrix composites |
US10494926B2 (en) | 2017-08-28 | 2019-12-03 | General Electric Company | System and method for maintaining machines |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
JP4667714B2 (en) | Removal method of ceramic film | |
US20080028605A1 (en) | Weld repair of metallic components | |
EP1118695B1 (en) | Method of removing a thermal barrier coating | |
US20120167389A1 (en) | Method for providing a film cooled article | |
US20100126014A1 (en) | Repair method for tbc coated turbine components | |
US20100236067A1 (en) | Hybrid welding repair of gas turbine superalloy components | |
US20140193664A1 (en) | Recoating process and recoated turbine blade | |
US20030082297A1 (en) | Combustion turbine blade tip restoration by metal build-up using thermal spray techniques | |
US20070202269A1 (en) | Local repair process of thermal barrier coatings in turbine engine components | |
CN100510153C (en) | Method of repairing a Ni-based alloy part | |
US20100028711A1 (en) | Thermal barrier coatings and methods of producing same | |
US20160281204A1 (en) | Thermal barrier coating repair | |
US9574447B2 (en) | Modification process and modified article | |
EP2547488B1 (en) | Method for reconditioning a turbine blade with at least one platform | |
US20160186626A1 (en) | Engine component and methods for an engine component | |
US20100136247A1 (en) | Method for hvof or lpps restoration coating repair of a nickel-base superalloy article | |
US7309512B2 (en) | Method of repairing an article having a bondcoat and a topcoat | |
US10052724B2 (en) | Braze composition, brazing process, and brazed article | |
JP2008240563A (en) | Gas turbine high-temperature component repairing method, and gas turbine high-temperature component | |
JP4509085B2 (en) | Coating method and apparatus | |
EP3351652B1 (en) | Apparatus and method for masking under platform areas of airfoil components | |
US20170369981A1 (en) | Treated gas turbine components and processes of treating gas turbine systems and gas turbine components | |
US20220288653A1 (en) | Method of removing contaminants from a diffusion-coated component | |
US20130323066A1 (en) | Maskant for fluoride ion cleaning | |
EP3054028A1 (en) | Hot section repair of metallic coatings |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
AS | Assignment |
Owner name: GENERAL ELECTRIC COMPANY, NEW YORK Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:THOMPSON, CHRISTOPHER EDWARD;WARD, JOHN D., JR;HUNT, MARK LAWRENCE;AND OTHERS;REEL/FRAME:029577/0637 Effective date: 20130102 |
|
STCB | Information on status: application discontinuation |
Free format text: ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION |