CN115961248A - Single crystal blade thermal barrier coating repairing method - Google Patents
Single crystal blade thermal barrier coating repairing method Download PDFInfo
- Publication number
- CN115961248A CN115961248A CN202211567023.1A CN202211567023A CN115961248A CN 115961248 A CN115961248 A CN 115961248A CN 202211567023 A CN202211567023 A CN 202211567023A CN 115961248 A CN115961248 A CN 115961248A
- Authority
- CN
- China
- Prior art keywords
- single crystal
- crystal blade
- sand
- temperature
- furnace
- 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.)
- Pending
Links
- 239000013078 crystal Substances 0.000 title claims abstract description 62
- 238000000034 method Methods 0.000 title claims abstract description 57
- 239000012720 thermal barrier coating Substances 0.000 title claims abstract description 20
- 239000004576 sand Substances 0.000 claims abstract description 77
- 238000007664 blowing Methods 0.000 claims abstract description 31
- 239000000919 ceramic Substances 0.000 claims abstract description 29
- 239000002344 surface layer Substances 0.000 claims abstract description 25
- 238000009792 diffusion process Methods 0.000 claims abstract description 22
- 238000010894 electron beam technology Methods 0.000 claims abstract description 22
- 238000007740 vapor deposition Methods 0.000 claims abstract description 22
- 239000010410 layer Substances 0.000 claims abstract description 18
- 239000011248 coating agent Substances 0.000 claims abstract description 15
- 238000000576 coating method Methods 0.000 claims abstract description 15
- 238000009835 boiling Methods 0.000 claims abstract description 12
- 238000005269 aluminizing Methods 0.000 claims description 36
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims description 28
- 238000001816 cooling Methods 0.000 claims description 22
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 21
- 230000008569 process Effects 0.000 claims description 20
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims description 14
- 229910052786 argon Inorganic materials 0.000 claims description 14
- 238000000151 deposition Methods 0.000 claims description 14
- 230000008021 deposition Effects 0.000 claims description 14
- 238000010438 heat treatment Methods 0.000 claims description 11
- 229910015372 FeAl Inorganic materials 0.000 claims description 7
- 238000004140 cleaning Methods 0.000 claims description 7
- 238000011049 filling Methods 0.000 claims description 7
- 238000011068 loading method Methods 0.000 claims description 7
- 239000000843 powder Substances 0.000 claims description 7
- 238000004506 ultrasonic cleaning Methods 0.000 claims description 7
- 238000005488 sandblasting Methods 0.000 claims description 3
- 238000005422 blasting Methods 0.000 claims description 2
- 238000010411 cooking Methods 0.000 claims description 2
- 239000005002 finish coating Substances 0.000 claims description 2
- 238000012423 maintenance Methods 0.000 abstract description 2
- 238000011017 operating method Methods 0.000 abstract description 2
- 230000009467 reduction Effects 0.000 abstract description 2
- 238000005406 washing Methods 0.000 abstract description 2
- 239000000463 material Substances 0.000 description 12
- 230000008439 repair process Effects 0.000 description 6
- 238000001000 micrograph Methods 0.000 description 4
- 239000003513 alkali Substances 0.000 description 2
- 229910045601 alloy Inorganic materials 0.000 description 2
- 239000000956 alloy Substances 0.000 description 2
- 238000005266 casting Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000011148 porous material Substances 0.000 description 2
- 238000004321 preservation Methods 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 229910018072 Al 2 O 3 Inorganic materials 0.000 description 1
- 229910001030 Iron–nickel alloy Inorganic materials 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 238000002679 ablation Methods 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000012459 cleaning agent Substances 0.000 description 1
- 238000007713 directional crystallization Methods 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 description 1
- 229910052702 rhenium Inorganic materials 0.000 description 1
- WUAPFZMCVAUBPE-UHFFFAOYSA-N rhenium atom Chemical compound [Re] WUAPFZMCVAUBPE-UHFFFAOYSA-N 0.000 description 1
- 230000035939 shock Effects 0.000 description 1
- 238000004901 spalling Methods 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
Images
Classifications
-
- 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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T50/00—Aeronautics or air transport
- Y02T50/60—Efficient propulsion technologies, e.g. for aircraft
Landscapes
- Turbine Rotor Nozzle Sealing (AREA)
Abstract
The invention provides a method for repairing a thermal barrier coating of a single crystal blade, which comprises the steps of carrying out high-pressure alkaline boiling on the damaged single crystal blade to remove a YSZ ceramic surface layer, and removing an aluminized layer by adopting automatic blow-dry sand to obtain the single crystal blade with a clean surface; carry out calorization and calorization diffusion in proper order to the clean single crystal blade surface in surface to carry out the wet sand blowing and handle, adopt electron beam vapor deposition method to scribble YSZ ceramic surface course after the washing, accomplish the restoration, this application operating procedure is simple, it is effectual to restore efficient, detect the single crystal stator after the restoration, the wall thickness of stator, the throat area, the influence of gas film hole is very little, mend behind the calorization degree of depth, the concentration all satisfies the designing requirement, carry out the coating cohesion after the ceramic surface course coating again and satisfy the designing requirement, cost of maintenance after the reduction single crystal blade that can be very big damages.
Description
Technical Field
The invention belongs to the field of repair of a thermal barrier coating of a single crystal blade of an aeroengine, and particularly relates to a repair method of a thermal barrier coating of a single crystal blade.
Background
The single crystal blade is a casting blade with only one crystal grain, and the directional crystallization blade eliminates transverse crystal boundaries sensitive to cavities and cracks, so that all the crystal boundaries are parallel to the stress axis direction, and the service performance of the alloy is improved.
At present, the rhenium-containing single crystal hollow blade is the first choice and trend of a turbine engine, the blade material of the turbine is required to be a nickel-iron alloy, namely, a strong directional magnetic field is generated by using an electromagnet while normal casting is carried out, unset high-temperature alloy is diffusely solidified in the same direction under the action of the directional magnetic field, and finally, single crystals with all atomic arrangements consistent are formed, but common steel and the like are polycrystal, so that the orderly arranged material can bear high temperature.
As shown in figure 1, a high-guide vane structure of a certain type of aeroengine is made of DD5 materials, the surface of the vane is an aluminized and YSZ-sprayed ceramic surface layer, and after long-time use, aluminized/YSZ thermal barrier coating spalling and ablation phenomena of different degrees appear on the surface of a single-crystal vane body, so that continuous normal use is influenced, and the conventional operation is to replace a new single-crystal vane, but the economy is poor.
Disclosure of Invention
Aiming at the problems in the prior art, the invention provides a method for repairing a thermal barrier coating of a single crystal blade, which is simple to operate and good in economy.
The invention is realized by the following technical scheme:
a method for repairing a thermal barrier coating of a single crystal blade comprises the following steps:
carrying out high-pressure alkaline boiling on the damaged single crystal blade to remove a YSZ ceramic surface layer, and removing an aluminized layer by adopting automatic blow-dry sand to obtain a single crystal blade with a clean surface;
and sequentially carrying out aluminizing and aluminizing diffusion on the surface of the single crystal blade with a clean surface, carrying out wet sand blasting treatment, and coating a YSZ ceramic surface layer by adopting an electron beam vapor deposition method after cleaning to finish repairing.
Further, the high-pressure alkali cooking adopts high-temperature boiling of a sodium hydroxide solution.
Furthermore, the sand blowing method adopts a press-in type sand blowing machine with a sand nozzle diameter of 6-10mm, sand adopts 60-mesh alumina sand, the wind pressure is 0.15-0.25MPa, and the sand blowing distance is 200-350mm.
Further, the aluminizing process includes the following steps:
placing the single crystal blade with clean surface into 50 parts of FeAl powder, and adding 1 part of NH 4 Cl, and the charging temperature is less than or equal to 50 ℃;
heating the furnace to 1020-1060 ℃, keeping the temperature for 4-5h, cooling the furnace to below 800 ℃ and then cooling the furnace by air to finish aluminizing, wherein the pressure is 0.06-0.08 MPa.
Further, the aluminizing diffusion is completed in the process of raising the temperature in the furnace to 1020-1060 ℃ in the aluminizing process, wherein the temperature is kept at 1000-1020 ℃ for 1-1.25h, the temperature is kept at 1020-1040 ℃ for 2-2.25h, and the temperature is kept at 1040-1060 ℃ for 1-1.25h.
Further, after the furnace is cooled to below 800 ℃, argon is filled into the furnace to 0.8-1.0bar, and a fan is turned on to cool the furnace to below 80 ℃.
Furthermore, the wet sand blowing treatment adopts 120-220 mesh alumina sand as a sand mold, the wind pressure is less than or equal to 0.2MPa, and the sand blowing time is 30-60 minutes.
Further, ultrasonic cleaning is adopted for cleaning for 15-25 minutes after the wet sand blowing treatment.
Furthermore, when the YSZ ceramic surface layer is coated by the electron beam vapor deposition method, zrO is adopted 2 ·Y 2 O 3 As the ingot, the vacuum degree of the deposition chamber and the loading chamber was 2X 10 -4 Keeping the electron beam vapor deposition temperature at 920-940 ℃ for 25-28min at the torr, the diffusion temperature at 1040-1060 ℃ and the heat preservation time at 2-2.25h; and filling argon into the deposition chamber to 0.8-1.0bar, opening a fan, and cooling to below 80 ℃ to finish coating the YSZ ceramic surface layer by the electron beam vapor deposition method.
Further, the material ingot ZrO 2 ·Y 2 O 3 The supply rate of (B) is 0.5 to 1.5mm/min, and the consumption amount thereof is set to 26 to 28mm.
Compared with the prior art, the invention has the following beneficial technical effects:
the invention provides a method for repairing a thermal barrier coating of a single crystal blade, which comprises the steps of carrying out high-pressure alkaline boiling on the damaged single crystal blade to remove a YSZ ceramic surface layer, and removing an aluminized layer by adopting automatic blow-dry sand to obtain the single crystal blade with a clean surface; carry out calorization and calorization diffusion in proper order to the clean single crystal blade surface in surface to carry out the wet sand blowing and handle, adopt electron beam vapor deposition method to scribble YSZ ceramic surface course after the washing, accomplish the restoration, this application operating procedure is simple, it is effectual to restore efficient, detect the single crystal stator after the restoration, the wall thickness of stator, the throat area, the influence of gas film hole is very little, mend behind the calorization degree of depth, the concentration all satisfies the designing requirement, carry out the coating cohesion after the ceramic surface course coating again and satisfy the designing requirement, cost of maintenance after the reduction single crystal blade that can be very big damages.
Drawings
FIG. 1 is a flow chart of a method for repairing a thermal barrier coating of a single crystal blade according to the present invention;
FIG. 2 is a schematic view of a prior art single crystal blade configuration;
FIG. 3 is a diagram showing a comparison of the pore diameters of the front and rear air films in example 1 of the present invention;
FIG. 4 is a diagram showing a comparison between the pore sizes of the front and rear air films in the embodiment 4 of the present invention;
FIG. 5 is a depth electron microscope image of the aluminized layer on the outer surface in example 1 of the present invention;
FIG. 6 is a depth electron microscope image of the aluminized layer of the inner cavity in embodiment 1 of the present invention.
Detailed Description
The present invention will now be described in further detail with reference to specific examples, which are intended to be illustrative, but not limiting, of the invention.
In order to make the technical solutions of the present invention better understood, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that the terms "first," "second," and the like in the description and claims of the present invention and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the invention described herein are capable of operation in other sequences than those illustrated or described herein. Moreover, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
The invention provides a method for repairing a thermal barrier coating of a single crystal blade, which comprises the following steps as shown in figure 1:
carrying out high-pressure alkaline boiling on the damaged single crystal blade to remove a YSZ ceramic surface layer, and removing an aluminized layer by adopting automatic blow-dry sand to obtain a single crystal blade with a clean surface;
and sequentially carrying out aluminizing and aluminizing diffusion on the surface of the single crystal blade with a clean surface, carrying out wet sand blasting treatment, and coating a YSZ ceramic surface layer by adopting an electron beam vapor deposition method after cleaning to finish repairing.
Preferably, the high-pressure alkali boiling adopts a sodium hydroxide solution to boil at high temperature, and aims to eliminate the aluminum oxide on the surface of the single crystal blade, and the reaction formula is as follows:
Al 2 O 3 +2NaOH＝2NaAlO 2 +H 2 O。
preferably, the sand drying method adopts a press-in type sand blower with a sand nozzle diameter of 6-10mm, sand adopts 60-mesh alumina sand, the wind pressure is 0.15-0.25MPa, the sand blowing distance is 200-350mm, and preferably, the removal amount of the seeping layer is controlled by adjusting the sand blowing time of the seeping layers in different states, generally 10-15 seconds.
Preferably, the aluminizing process includes the steps of:
placing the single crystal blade with clean surface into 50 parts of FeAl powder, and adding 1 part of NH 4 Cl, and the charging temperature is less than or equal to 50 ℃;
heating the furnace to 1020-1060 ℃, keeping the temperature for 4-5h, cooling the furnace to below 800 ℃ and then cooling the furnace by air to finish aluminizing, wherein the pressure is 0.06-0.08 MPa.
Further, the aluminizing diffusion is finished in the process of heating the furnace to 1020-1060 ℃ in the aluminizing process, wherein the temperature is kept at 1000-1020 ℃ for 1-1.25h, the temperature is kept at 1020-1040 ℃ for 2-2.25h, and the temperature is kept at 1040-1060 ℃ for 1-1.25h; specifically, after the furnace is cooled to below 800 ℃, argon is filled into the furnace to 0.8-1.0bar, and a fan is turned on to cool the furnace to below 80 ℃.
Furthermore, the wet sand blowing treatment adopts 120-220 mesh alumina sand as a sand mold, the wind pressure is less than or equal to 0.2MPa, and the sand blowing time is 30-60 minutes.
Further, the cleaning after the wet blasting treatment was carried out by ultrasonic cleaning in a solution of a water-based cleaning agent solution at a ratio of 3% to 5% by weight for 15 to 25 minutes.
Preferably, zrO is adopted when the YSZ ceramic surface layer is coated by the electron beam vapor deposition method 2 ·Y 2 O 3 As a material ingot, the vacuum degree of the deposition chamber and the loading chamber is 2X 10 -4 Keeping the electron beam vapor deposition temperature at 920-940 ℃ for 25-28min at the torr, the diffusion temperature at 1040-1060 ℃ and the heat preservation time at 2-2.25h; filling argon into the deposition chamber to 0.8-1.0bar, opening a fan, cooling to below 80 ℃, and finishing coating a YSZ ceramic surface layer by an electron beam vapor deposition method; further, the material ingot ZrO 2 ·Y 2 O 3 The supply rate of (B) is 0.5 to 1.5mm/min, and the consumption amount thereof is set to 26 to 28mm.
Example 1:
removing a YSZ ceramic surface layer of the damaged monocrystalline blade 1HA-05 by adopting sodium hydroxide solution high-pressure alkaline boiling, and removing an aluminized layer by adopting a press-in type sand blower with a sand nozzle diameter of 6mm, wherein the sand is 60-mesh alumina sand, the air pressure is 0.15MPa, and the sand blowing distance is 200mm to obtain a monocrystalline blade with a clean surface;
placing the single crystal blade with clean surface into 50 parts of FeAl powder, and adding 1 part of NH 4 Cl, and the charging temperature is less than or equal to 50 ℃; heating the furnace to 1020-1060 ℃, keeping the temperature for 4h, keeping the pressure at 0.06MPa, cooling the furnace to below 800 ℃, and then cooling in the air;
in the aluminizing process, aluminizing diffusion is completed in the process of heating the furnace to 1020-1060 ℃, wherein the temperature is kept at 1000-1020 ℃ for 1h, the temperature is kept at 1020-1040 ℃ for 2h, the temperature is kept at 1040-1060 ℃ for 1h, then the furnace is cooled to 800 ℃, argon is filled into the furnace to 0.8bar, a fan is opened, and the furnace is cooled to 80 ℃ to complete aluminizing and aluminizing diffusion;
adopting 120-220 mesh alumina sand as sand mold, air pressure of 0.2MPa, sand blowing time of 30 min, wet sand blowing treatment, ultrasonic cleaning for 15 min, and ZrO 2 ·Y 2 O 3 As a material ingot, the vacuum degree of the deposition chamber and the loading chamber is 2X 10 -4 Keeping the temperature for 25min at the temperature of 920-940 ℃ in the range of the electron beam vapor deposition temperature at the torr, keeping the diffusion temperature at 1040-1060 ℃ and keeping the temperature for 2h; filling argon into the deposition chamber to 0.8bar, opening a fan, cooling to 80 ℃, and finishing coating a YSZ ceramic surface layer by an electron beam vapor deposition method, wherein the material ingot is ZrO 2 ·Y 2 O 3 The supply rate of (2) was 0.5mm/min, and the consumption thereof was set to 26mm, thereby completing the repair of the single crystal blade。
Example 2:
removing a YSZ ceramic surface layer of the damaged monocrystalline blade 1HA-05 by adopting sodium hydroxide solution high-pressure alkaline boiling, and removing an aluminized layer by adopting a press-in type sand blower with a sand nozzle diameter of 10mm, wherein the sand is 60-mesh alumina sand, the air pressure is 0.2MPa, and the sand blowing distance is 275mm to obtain a monocrystalline blade with a clean surface;
placing the single crystal blade with clean surface into 50 parts of FeAl powder, and adding 1 part of NH 4 Cl, and the charging temperature is less than or equal to 50 ℃; heating the furnace to 1020-1060 ℃, keeping the temperature for 5.5h under the pressure of 0.07MPa, cooling the furnace to below 800 ℃, and then cooling the furnace by air;
in the aluminizing process, aluminizing diffusion is completed in the process that the temperature of the furnace is raised to 1020-1060 ℃, wherein the temperature is kept at 1000-1020 ℃ for 1.13h, the temperature is kept at 1020-1040 ℃ for 2.13h, and the temperature is kept at 1040-1060 ℃ for 1.14h, then the furnace is cooled to 800 ℃, argon is filled into the furnace to 0.9bar, a fan is opened, and the furnace is cooled to 80 ℃, so that aluminizing and aluminizing diffusion are completed;
adopting 120-220 mesh alumina sand as sand mold, air pressure of 0.2MPa, sand blowing time of 45 min, wet sand blowing, ultrasonic cleaning for 20 min, and ZrO 2 ·Y 2 O 3 As the ingot, the vacuum degree of the deposition chamber and the loading chamber was 2X 10 -4 Keeping the temperature for 27min at the temperature of 920-940 ℃ in the range of the electron beam vapor deposition temperature at the torr, keeping the diffusion temperature at 1040-1060 ℃ and keeping the temperature for 2.13h; filling argon into the deposition chamber to 0.9bar, opening a fan, cooling to 80 ℃, and finishing coating a YSZ ceramic surface layer by an electron beam vapor deposition method, wherein a material ingot ZrO is 2 ·Y 2 O 3 The feeding rate of (1.0 mm/min) and the consumption amount thereof was set to 27mm, and the repair of the single crystal blade was completed.
Example 3:
removing a YSZ ceramic surface layer of the damaged monocrystalline blade 1HA-05 by adopting sodium hydroxide solution high-pressure alkaline boiling, and removing an aluminized layer by adopting a press-in type sand blower with a sand nozzle diameter of 10mm, wherein the sand is 60-mesh alumina sand, the air pressure is 0.25MPa, and the sand blowing distance is 350mm to obtain a monocrystalline blade with a clean surface;
cleaning single crystal bladeAdding the mixture into 50 parts of FeAl powder, and adding 1 part of NH 4 Cl, and the charging temperature is less than or equal to 50 ℃; heating the furnace to 1020-1060 ℃, keeping the temperature for 5h, keeping the pressure at 0.08MPa, cooling the furnace to below 800 ℃, and then cooling the furnace by air;
in the aluminizing process, aluminizing diffusion is completed in the process of heating the furnace to 1020-1060 ℃, wherein the temperature is kept at 1000-1020 ℃ for 1.25h, the temperature is kept at 1020-1040 ℃ for 2.25h, the temperature is kept at 1040-1060 ℃ for 1.25h, then the furnace is cooled to 800 ℃, argon is filled into the furnace to 1.0bar, a fan is turned on, and the furnace is cooled to 80 ℃ to complete aluminizing and aluminizing diffusion;
adopting 120-220 mesh alumina sand as sand mold, air pressure of 0.2MPa, sand blowing time of 60 min, wet sand blowing, ultrasonic cleaning for 25min, and ZrO 2 ·Y 2 O 3 As a material ingot, the vacuum degree of the deposition chamber and the loading chamber is 2X 10 -4 Keeping the temperature for 28min at the temperature of 920-940 ℃ in the range of the electron beam vapor deposition temperature at the torr, keeping the diffusion temperature at 1040-1060 ℃ and keeping the temperature for 2.25h; filling argon into the deposition chamber to 1.0bar, opening a fan, cooling to 80 ℃, and finishing coating a YSZ ceramic surface layer by an electron beam vapor deposition method, wherein the material ingot is ZrO 2 ·Y 2 O 3 The feeding rate of (1.5 mm/min) and the consumption amount thereof was set to 28mm, and the repair of the single crystal blade was completed.
Example 4:
removing the YSZ ceramic surface layer of the damaged single crystal blade 1GA-24 by adopting sodium hydroxide solution high-pressure alkaline boiling, and removing an aluminized layer by adopting a press-in type sand blower with a sand nozzle diameter of 10mm, 60-mesh alumina sand as sand, the wind pressure of 0.25MPa and the sand blowing distance of 350mm to obtain a single crystal blade with a clean surface;
placing the single crystal blade with clean surface into 50 parts of FeAl powder, and adding 1 part of NH 4 Cl, and the charging temperature is less than or equal to 50 ℃; heating the furnace to 1020-1060 ℃, keeping the temperature for 5h under the pressure of 0.08MPa, cooling the furnace to below 800 ℃, and then cooling the furnace by air;
in the aluminizing process, aluminizing diffusion is completed in the process of heating the furnace to 1020-1060 ℃, wherein the temperature is kept at 1000-1020 ℃ for 1.25h, the temperature is kept at 1020-1040 ℃ for 2.25h, the temperature is kept at 1040-1060 ℃ for 1.25h, then the furnace is cooled to 800 ℃, argon is filled into the furnace to 1.0bar, a fan is turned on, and the furnace is cooled to 80 ℃ to complete aluminizing and aluminizing diffusion;
adopting 120-220 mesh alumina sand as sand mold, air pressure of 0.2MPa, sand blowing time of 60 min, wet sand blowing, ultrasonic cleaning for 25min, and ZrO 2 ·Y 2 O 3 As the ingot, the vacuum degree of the deposition chamber and the loading chamber was 2X 10 -4 Keeping the temperature for 28min at the temperature of 920-940 ℃ in the range of the electron beam vapor deposition temperature at the torr, keeping the diffusion temperature at 1040-1060 ℃ and keeping the temperature for 2.25h; filling argon into the deposition chamber to 1.0bar, opening a fan, cooling to 80 ℃, and finishing coating a YSZ ceramic surface layer by an electron beam vapor deposition method, wherein the material ingot is ZrO 2 ·Y 2 O 3 The feed rate of (2) was 1.5mm/min, and the consumption thereof was set to 28mm, thereby completing the repair of the single crystal blade.
The comparison of the wall thickness of the permeability-removing layer and the throat area in the sand blowing process in the specific examples 1 to 4 of the application is shown in the following table 1, the wall thickness is not changed, and the throat area is increased by 0.004 to mm.
TABLE 1
Meanwhile, the influence of aluminized layer removal on the air film aperture is small, only a small amount of air film aperture is increased, the increased amount is 0.01mm, the air film aperture meets the size requirement, the air film aperture ratio before and after sand blowing of the embodiment 1 and the embodiment 4 is selected, for example, as shown in fig. 3 and 4, and the comparison chart of the air film aperture before and after sand blowing of the other embodiments is omitted.
As shown in table 2 before and after re-aluminizing, after complete removal and partial removal of the aluminized layer and re-aluminizing, the depth of the aluminized layer on the inner cavity and the outer surface of the blade both meet the requirements, i.e., the concentration of the aluminum element is not less than 20%, the depth of the aluminized layer is 0.03-0.06 mm, and the outer surface is 0.040-0.060 mm, wherein the aluminized depth of the outer surface and the inner cavity of the repaired single crystal blade in the specific embodiment 1 is shown in fig. 5 and 6, and the electron microscope images of the outer surface and the aluminized depth of the inner cavity of the other embodiments are very similar to that of the embodiment 1 in the electron microscope image, and are omitted here.
TABLE 2
And (3) testing the thermal shock effect after coating the YSZ ceramic surface layer, keeping the temperature at 1100 ℃ for 5min, and cooling with water for 1min for 1 cycle, wherein the cycle times are 120. The result is that the surface state of the part is intact, and the coating does not fall off, so the coating performance of the single crystal blade after Al + is added and the YSZ ceramic surface layer is recoated can meet the requirements of the part.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (10)
1. The method for repairing the thermal barrier coating of the single crystal blade is characterized by comprising the following steps of:
carrying out high-pressure alkaline boiling on the damaged single crystal blade to remove a YSZ ceramic surface layer, and removing an aluminized layer by adopting automatic blow-dry sand to obtain a single crystal blade with a clean surface;
and sequentially carrying out aluminizing and aluminizing diffusion on the surface of the single crystal blade with a clean surface, carrying out wet sand blasting treatment, and coating a YSZ ceramic surface layer by adopting an electron beam vapor deposition method after cleaning to finish repairing.
2. The method for repairing a thermal barrier coating of a single crystal blade of claim 1, wherein the high pressure alkaline cooking is performed by high temperature boiling with a sodium hydroxide solution.
3. The method for repairing a thermal barrier coating of a single crystal blade of claim 1, wherein a press-in type sand blower with a sand nozzle diameter of 6-10mm is adopted as the sand blowing method, 60-mesh alumina oxide sand is adopted as the sand, the air pressure is 0.15-0.25MPa, and the sand blowing distance is 200-350mm.
4. The method of claim 1, wherein the aluminizing process comprises the steps of:
placing the single crystal blade with clean surface into 50 parts of FeAl powder, and adding 1 part of NH 4 Cl, and the charging temperature is less than or equal to 50 ℃;
heating the furnace to 1020-1060 ℃, keeping the temperature for 4-5h, cooling the furnace to below 800 ℃ and then cooling the furnace by air to finish aluminizing, wherein the pressure is 0.06-0.08 MPa.
5. The method for repairing the thermal barrier coating of the monocrystalline blade according to claim 4, wherein the aluminizing diffusion is completed in a process of raising the temperature of the furnace to 1020-1060 ℃ in the aluminizing process, wherein the temperature is kept between 1000-1020 ℃ for 1-1.25h, the temperature is kept between 1020-1040 ℃ for 2-2.25h, and the temperature is kept between 1040-1060 ℃ for 1-1.25h.
6. The method for repairing a thermal barrier coating of a single crystal blade of claim 4, wherein the furnace is cooled to below 800 ℃, argon is filled into the furnace to 0.8-1.0bar, and a fan is turned on to cool the furnace to below 80 ℃.
7. The method for repairing the thermal barrier coating of the single crystal blade according to claim 1, wherein the wet sand blowing treatment adopts 120-220 mesh alumina oxide sand, the wind pressure is less than or equal to 0.2MPa, and the sand blowing time is 30-60 minutes.
8. The method for repairing the thermal barrier coating of the single-crystal blade as claimed in claim 1, wherein the cleaning after the wet blasting treatment is ultrasonic cleaning for 15-25 minutes.
9. The method for repairing a thermal barrier coating of a single crystal blade of claim 1, wherein the YSZ ceramic surface layer is applied by electron beam vapor deposition using ZrO 2 ·Y 2 O 3 As the ingot, the vacuum degree of the deposition chamber and the loading chamber was 2X 10 -4 Keeping the temperature at 920-940 deg.C for 25-28min at the temperature of electron beam vapor deposition in the range of from 1040-1060 deg.C for 2-2.25h; and filling argon into the deposition chamber to 0.8-1.0bar, opening a fan, and cooling to below 80 ℃ to finish coating the YSZ ceramic surface layer by the electron beam vapor deposition method.
10. The method for repairing the thermal barrier coating of the single-crystal blade of claim 9, wherein the ingot ZrO 2 2 ·Y 2 O 3 The supply rate of (B) is 0.5 to 1.5mm/min, and the consumption amount thereof is set to 26 to 28mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211567023.1A CN115961248A (en) | 2022-12-07 | 2022-12-07 | Single crystal blade thermal barrier coating repairing method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211567023.1A CN115961248A (en) | 2022-12-07 | 2022-12-07 | Single crystal blade thermal barrier coating repairing method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN115961248A true CN115961248A (en) | 2023-04-14 |
Family
ID=87359371
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202211567023.1A Pending CN115961248A (en) | 2022-12-07 | 2022-12-07 | Single crystal blade thermal barrier coating repairing method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN115961248A (en) |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20050106316A1 (en) * | 2003-11-13 | 2005-05-19 | General Electric Company | Method for repairing coated components |
| CN105463453A (en) * | 2015-11-25 | 2016-04-06 | 沈阳黎明航空发动机(集团)有限责任公司 | Thermal barrier coating with stable interface and manufacturing method of thermal barrier coating |
| CN108130515A (en) * | 2017-12-08 | 2018-06-08 | 中国航发动力股份有限公司 | A kind of preparation method of long-life thermal barrier coating |
| CN109161911A (en) * | 2018-09-11 | 2019-01-08 | 北京航空航天大学 | A kind of removal device and method of thermal barrier coating |
| CN109576720A (en) * | 2019-01-31 | 2019-04-05 | 中国航发动力股份有限公司 | A kind of pressurization soda boiling method of ceramic layer in removal thermal barrier coating |
| CN111254377A (en) * | 2020-01-22 | 2020-06-09 | 中国人民解放军第五七一九工厂 | Repair method for long-life thermal barrier coating of F-grade ground heavy gas turbine blade |
-
2022
- 2022-12-07 CN CN202211567023.1A patent/CN115961248A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20050106316A1 (en) * | 2003-11-13 | 2005-05-19 | General Electric Company | Method for repairing coated components |
| CN105463453A (en) * | 2015-11-25 | 2016-04-06 | 沈阳黎明航空发动机(集团)有限责任公司 | Thermal barrier coating with stable interface and manufacturing method of thermal barrier coating |
| CN108130515A (en) * | 2017-12-08 | 2018-06-08 | 中国航发动力股份有限公司 | A kind of preparation method of long-life thermal barrier coating |
| CN109161911A (en) * | 2018-09-11 | 2019-01-08 | 北京航空航天大学 | A kind of removal device and method of thermal barrier coating |
| CN109576720A (en) * | 2019-01-31 | 2019-04-05 | 中国航发动力股份有限公司 | A kind of pressurization soda boiling method of ceramic layer in removal thermal barrier coating |
| CN111254377A (en) * | 2020-01-22 | 2020-06-09 | 中国人民解放军第五七一九工厂 | Repair method for long-life thermal barrier coating of F-grade ground heavy gas turbine blade |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US7882884B2 (en) | Method for casting core removal | |
| EP1013798B1 (en) | Thermal barrier coating removal process | |
| RU2405070C2 (en) | Method of electrochemical removal of coat from structural part | |
| US7240718B2 (en) | Method for casting core removal | |
| CN104550731B (en) | The preparation technology that the anti-surface stray crystal of single crystal hollow turbo blade is formed with recrystallization | |
| US20100276103A1 (en) | Metallic Coated Cores to Facilitate Thin Wall Casting | |
| JPH09177501A (en) | Method for removing overlaid excessive coating form inside of cooling hole of alminide coated gas turbine engine parts and gas turbine parts processed thereby | |
| CN107243601B (en) | It reduces high temperature alloy single crystal casting and recrystallizes tendentious composite form preparation method | |
| CN104384449B (en) | A kind of method controlling essence casting turbo blade grain size | |
| CN112813399A (en) | High-entropy metal glass protective coating and preparation method thereof | |
| US20050241797A1 (en) | Method for producing a hollow cast component having an inner coating | |
| CN105478672A (en) | Investment centrifugal casting method and device used for formwork dewaxing port and having plugging device | |
| CN115961248A (en) | Single crystal blade thermal barrier coating repairing method | |
| US8252376B2 (en) | Method for restoring the microstructure of a textured article and for refurbishing a gas turbine blade or vane | |
| JP2003245857A (en) | Method of removing metal layer of layer system | |
| US20110214603A1 (en) | Method of manufacturing silicon single crystal | |
| CN108330483A (en) | The laser cladding forming method of monocrystalline MCrAlY coatings on single crystal super alloy matrix | |
| CN103834896A (en) | Continuous casting crystallizer long-side copper plate coating thermal spraying method | |
| CN108286036A (en) | A kind of original position oxygenating type scanning electron beam vapor deposition (IOC-SEVD) devices and methods therefor | |
| US7429174B2 (en) | Clean atmosphere heat treat for coated turbine components | |
| US20030062099A1 (en) | Method for restoring the microstructure of a textured article and for refurbishing a gas turbine blade or vane | |
| CN116200726A (en) | Method for chemical vapor deposition of AlCr coating on surface of nickel-based superalloy | |
| US11319257B2 (en) | Ceramic heat shields having surface infiltration for preventing corrosion and erosion attacks | |
| TW201742686A (en) | Ceramic shell dewaxing method and device | |
| CN107190261B (en) | A kind of High-temperature antioxidant niobium alloy surface recombination silicide coating and preparation method |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |