CN108220953B - Laser surface treatment method for improving heat corrosion resistance of thermal barrier coating - Google Patents

Laser surface treatment method for improving heat corrosion resistance of thermal barrier coating Download PDF

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CN108220953B
CN108220953B CN201711447029.4A CN201711447029A CN108220953B CN 108220953 B CN108220953 B CN 108220953B CN 201711447029 A CN201711447029 A CN 201711447029A CN 108220953 B CN108220953 B CN 108220953B
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thermal barrier
barrier coating
laser
density
energy
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CN108220953A (en
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伊鹏
战祥华
尹晓丽
贾德龙
肖培发
王志远
桂文波
刘衍聪
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China University of Petroleum East China
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    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C24/00—Coating starting from inorganic powder
    • C23C24/08—Coating starting from inorganic powder by application of heat or pressure and heat
    • C23C24/10—Coating starting from inorganic powder by application of heat or pressure and heat with intermediate formation of a liquid phase in the layer
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C4/00—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge
    • C23C4/04—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge characterised by the coating material
    • C23C4/10—Oxides, borides, carbides, nitrides or silicides; Mixtures thereof
    • C23C4/11—Oxides
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C4/00—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge
    • C23C4/18—After-treatment

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
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  • Other Surface Treatments For Metallic Materials (AREA)
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Abstract

The invention discloses a laser surface treatment method for improving the heat corrosion resistance of a thermal barrier coating, and belongs to the technical field of thermal barrier coating treatment. The processing method comprises the following steps: step S1: carrying out ultrasonic cleaning on the surface of the thermal barrier coating, and adjusting the shape of a light spot of a laser to be rectangular; step S2: adjusting the laser in the step S1 to emit low-energy-density laser, and performing self-preheating scanning on the thermal barrier coating processed in the step S1; step S3: adjusting the laser in the step S1 to emit high-energy-density laser, and carrying out remelting scanning on the thermal barrier coating processed in the step S2; step S4: adjusting the laser in the step S1 to emit laser with medium energy density, and performing slow cooling scanning on the thermal barrier coating processed in the step S3; step S5: and naturally cooling the thermal barrier coating processed in the step S4 to room temperature, and then removing impurities on the surface of the coating cooled to room temperature by using compressed air. The treated coating is smooth and compact, inhibits the hot corrosion of corrosive salt and prolongs the service life of the coating.

Description

Laser surface treatment method for improving heat corrosion resistance of thermal barrier coating
Technical Field
The invention relates to the technical field of thermal barrier coating treatment, in particular to a laser surface treatment method for improving the heat corrosion resistance of a thermal barrier coating.
Background
The thermal barrier coating has the comprehensive properties of high melting point, low heat conduction coefficient, high fracture toughness, high thermal expansion coefficient and the like, and is widely applied to the manufacturing of turbine blades of aeroengines and gas turbines at present. Thermal barrier coating materials are diverse, of which YSZ (Y)2O3StabilizationZrO2) Thermal barrier coating materials are the most mature and widely applied, and are usually obtained by a thermal spraying method. As one of important applications, YSZ thermal barrier coating in a gas turbine is often used in severe working conditions of hot corrosion, and Na and V impurities in fuel form Na under high-temperature gas environment2SO4-V2O5Molten salt and thermal barrier coating stabilizer Y attached to the surface of the coating2O3Generate chemical reaction to generate YVO4Rendering tetragonal phase ZrO2Phase change to monoclinic phase ZrO2Accompanied by 3-5% volume expansion and simultaneous corrosion of the product YVO4And also has destructive effect on the thermal barrier coating, resulting in cracking and debonding failure of the thermal barrier coating.
At present, surface laser remelting is an important method for improving the heat corrosion resistance of a thermal barrier coating, and a compact columnar crystal structure is formed by eliminating the defects of pores, unmelted particles and the like in the thermal barrier coating, so that the invasion of corrosive molten salt is prevented. However, the existing laser remelting technology has simpler process links, and the inhibition effect on surface hot corrosion and infiltration hot corrosion is not obvious. Therefore, finding a treatment method capable of improving the hot corrosion resistance of the thermal barrier coating is a problem to be solved in the art.
Disclosure of Invention
In view of the above, the present invention provides a laser surface treatment method for improving the thermal corrosion resistance of a thermal barrier coating, which makes full use of the flexible and controllable process advantages of a laser, introduces a multiple scanning process including self-heating, remelting and slow cooling, can significantly improve the thermal corrosion resistance of the thermal barrier coating, and prolongs the service life of the thermal barrier coating.
Based on the above purpose, the invention provides a laser surface treatment method for improving the heat corrosion resistance of a thermal barrier coating, which comprises the following steps:
step S1: carrying out ultrasonic cleaning on the surface of the thermal barrier coating, and adjusting the shape of a light spot of a laser to be rectangular;
step S2: adjusting a laser to emit low-energy-density laser, and performing self-preheating scanning on the thermal barrier coating processed in the step S1;
step S3: adjusting a laser to emit high-energy-density laser, and performing remelting scanning on the thermal barrier coating processed in the step S2;
step S4: adjusting a laser to emit medium-energy-density laser, and performing slow cooling scanning on the thermal barrier coating processed in the step S3;
step S5: and naturally cooling the thermal barrier coating processed in the step S4 to room temperature, and then removing impurities on the surface of the thermal barrier coating cooled to room temperature by using compressed air.
Preferably, the laser in step S1 is a continuous semiconductor laser.
Preferably, the spot size of the laser in the step S1 is 12mm × 2 mm.
Preferably, the energy density of the low-energy-density laser in the step S2 is 7.2-7.5J/mm2. The energy density of the laser is adjusted to be 7.2-7.5J/mm by adjusting the laser power and the scanning speed of the laser2Within the range of (1); when the low-energy-density laser self-preheating scanning thermal barrier coating is adopted, a lower temperature field distribution is applied to the surface of the thermal barrier coating in advance, and the local preheating of the surface of the thermal barrier coating is realized, so that the extremely high temperature gradient caused by the low thermal conductivity of the thermal barrier coating material is reduced, and the subsequent remelting cracking and even falling off problems are avoided.
Preferably, the energy density of the high-energy density laser in the step S3 is 12.0-12.9J/mm2. The energy density of the laser is adjusted to be 12.0-12.9J/mm by adjusting the laser power and the scanning speed of the laser2Within the range of (1); when the self-preheated thermal barrier coating is remelted and scanned by adopting high-energy density laser, a molten pool is formed in a region reaching the melting point of a thermal barrier coating material and moves along with a light source, so that the local dynamic melting of the surface of the thermal barrier coating is realized.
Preferably, the medium energy density laser in the step S4The energy density is 10.0-10.8J/mm2. The energy density of the laser is adjusted to be 10.0-10.8J/mm by adjusting the laser power and the scanning speed of the laser2Within the range of (1); when the medium-energy-density laser is used for slow cooling scanning of the thermal barrier coating after remelting scanning, under the process condition, residual thermal stress concentration inside the remelting surface layer formed in the step S3 and in the remelting-heat affected zone is timely and effectively released, and stress cracking failure between the remelting layer and the unmelted material under the thermal cycle working condition in the subsequent service process of the thermal barrier coating is avoided.
The principle of the laser surface treatment method for improving the heat corrosion resistance of the thermal barrier coating provided by the invention is as follows: preparing a compact remelted layer on the surface of the thermal-sprayed thermal barrier coating by utilizing highly concentrated laser energy, wherein the thickness of the prepared remelted layer is 100-200 mu m, and the remelted layer can effectively reduce the thermal corrosion degree of the surface of the thermal barrier coating and can further prevent the infiltration of thermal corrosion molten salt; the compact degree is improved by adding a laser self-preheating process link with low energy density before remelting and adding a laser slow cooling process link with medium energy density after remelting, so that the corrosion resistance of the remelted layer is improved.
The thermal barrier coating treated by the method is subjected to a hot corrosion experiment, namely the corrosive is blended into paste and then uniformly coated on the surface of the thermal barrier coating, wherein the coating density is 25-30 mg/cm2And the coating density of the corrosive agent for the conventional hot corrosion test is generally 20mg/cm2Namely, when the hot corrosion test is carried out by the invention, the coating density of the corrosive agent is obviously higher than that of the conventional hot corrosion test.
The corrosive agent adopted when the hot corrosion experiment is carried out is configured as follows: mixing 55 mass percent of vanadium pentoxide and 45 mass percent of sodium sulfate, and adding deionized water to prepare pasty corrosive molten salt with the mass percent concentration of 40-50%.
The hot corrosion experimental process comprises the following steps: and (3) placing the thermal barrier coating coated with the uniform corrosive in a high-temperature furnace, heating to 1100 ℃ from 23 ℃ at the speed of 3 ℃/min, preserving heat for 25 hours, and then cooling to room temperature from 1100 ℃ at the speed of 5 ℃/min to complete the hot corrosion experiment.
From the above, it can be seen that the advantages and benefits of the present invention are:
the laser surface treatment method for improving the heat corrosion resistance of the thermal barrier coating provided by the invention fully utilizes the flexible and controllable process advantages of a laser, introduces a scanning process comprising self-preheating, remelting and slow cooling, then naturally cools the thermal barrier coating to room temperature, and finally the obtained thermal barrier coating has the advantages that the surface corrosion degree is reduced under the action of excessive corrosion molten salt, the infiltration of the corrosion molten salt is obviously inhibited through tissue densification, the heat corrosion resistance of the thermal barrier coating is further improved, and the service life of the thermal barrier coating is prolonged.
Drawings
FIG. 1 is a surface microtopography of an untreated YSZ thermal barrier coating;
FIG. 2 is a cross-sectional microtopography of an untreated YSZ thermal barrier coating;
FIG. 3 is a surface microtopography of a YSZ thermal barrier coating after treatment in example 1 of the present invention;
FIG. 4 is a cross-sectional microtopography of a treated YSZ thermal barrier coating of example 1 of the present invention;
FIG. 5 is a surface microtopography of a YSZ thermal barrier coating after treatment in example 2 of the present invention;
FIG. 6 is a cross-sectional microtopography of a treated YSZ thermal barrier coating of example 2 of the present invention;
FIG. 7 is a surface 3D topography of an untreated YSZ thermal barrier coating;
FIG. 8 is a surface 3D topography of a YSZ thermal barrier coating after treatment in example 1 of the present invention;
FIG. 9 is a surface 3D topography of a YSZ thermal barrier coating after treatment in example 2 of the present invention;
FIG. 10 is a surface topography of an untreated YSZ thermal barrier coating after hot erosion;
FIG. 11 is a surface topography of a treated YSZ thermal barrier coating after hot corrosion in example 1 of the present invention;
fig. 12 is a surface topography map of the treated YSZ thermal barrier coating after hot corrosion in example 2 of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to specific embodiments and the accompanying drawings.
It should be noted that all expressions using "first" and "second" in the embodiments of the present invention are used for distinguishing two entities with the same name but different names or different parameters, and it should be noted that "first" and "second" are merely for convenience of description and should not be construed as limitations of the embodiments of the present invention, and they are not described in any more detail in the following embodiments.
In the invention, the YSZ thermal barrier coating is taken as an example, and the treatment for improving the thermal corrosion resistance of the thermal barrier coating is carried out on the YSZ thermal barrier coating. The YSZ thermal barrier coating is obtained by using yttria-stabilized zirconia with the mass fraction of 7-8% as a thermal barrier coating material and adopting a thermal spraying method.
First, an embodiment
Example 1
A laser surface treatment method for improving the heat corrosion resistance of a YSZ thermal barrier coating comprises the following steps:
step S1: ultrasonically cleaning the surface of the YSZ thermal barrier coating by adopting an ultrasonic instrument, and adjusting the shape of a light spot of the semiconductor laser to be a rectangle, wherein the size of the light spot is 12mm multiplied by 2 mm;
step S2: the laser power of the semiconductor laser was adjusted to 400W, the scanning speed of the semiconductor laser was adjusted to 10mm/s, and the energy density was 7.2J/mm2The low-energy-density laser is adopted to perform self-preheating scanning on the YSZ thermal barrier coating processed in the step S1;
step S3: the laser power of the semiconductor laser was adjusted to 1800W, the scanning speed of the semiconductor laser was adjusted to 20mm/s, and the energy density was 12J/mm2The high-energy-density laser is adopted to carry out remelting scanning on the YSZ thermal barrier coating processed in the step S2;
step S4: the laser power of the semiconductor laser was adjusted to 600W, the scanning speed of the semiconductor laser was adjusted to 10mm/s,the energy density is 10.8J/mm2The YSZ thermal barrier coating processed in the step S3 is slowly cooled and scanned by the medium energy density laser;
step S5: and naturally cooling the thermal barrier coating processed in the step S4 to room temperature, and then removing impurities on the surface of the thermal barrier coating cooled to room temperature by using compressed air to complete the processing of the YSZ thermal barrier coating.
Observing the surface of the processed YSZ thermal barrier coating by using a microscope, wherein the surface microscopic topography of the processed YSZ thermal barrier coating is shown in figure 3, and the section microscopic topography of the processed YSZ thermal barrier coating is observed by using a Hitachi SU3500 scanning electron microscope, which is shown in figure 4. The surface 3D topography of the processed YSZ thermal barrier coating was observed using a keyence VHX5000 confocal optical microscope, as shown in fig. 8.
The YSZ thermal barrier coating surface processed in the step S5 is evenly coated with the corrosive, and the coating density is 30mg/cm2The YSZ thermal barrier coating evenly coated with the corrosive is placed in a high-temperature furnace, the temperature of the high-temperature furnace is increased from 23 ℃ to 1100 ℃ at the speed of 3 ℃/min, the temperature is kept for 25 hours, then the temperature is decreased from 1100 ℃ to room temperature at the speed of 5 ℃/min, a hot corrosion experiment is completed, the corrosion morphology of the YSZ thermal barrier coating after the hot corrosion experiment is observed by a microscope, and the experimental result is shown in figure 11.
Example 2
A laser surface treatment method for improving the heat corrosion resistance of a YSZ thermal barrier coating comprises the following steps:
step S1: ultrasonically cleaning the surface of the YSZ thermal barrier coating by adopting an ultrasonic instrument, and adjusting the shape of a light spot of the semiconductor laser to be a rectangle, wherein the size of the light spot is 12mm multiplied by 2 mm;
step S2: the laser power of the semiconductor laser was adjusted to 300W, the scanning speed of the semiconductor laser was adjusted to 8mm/s, and the energy density was 7.7J/mm2The low-energy-density laser is adopted to perform self-preheating scanning on the YSZ thermal barrier coating processed in the step S1;
step S3: the laser power of the semiconductor laser was adjusted to 1500W, and the semiconductor laser was excitedThe scanning speed of the optical device was adjusted to 15mm/s to obtain an energy density of 12.9J/mm2The high-energy-density laser is adopted to carry out remelting scanning on the YSZ thermal barrier coating processed in the step S2;
step S4: the laser power of the semiconductor laser was adjusted to 500W, the scanning speed of the semiconductor laser was adjusted to 9mm/s, and the energy density was 10J/mm2The YSZ thermal barrier coating processed in the step S3 is slowly cooled and scanned by the medium energy density laser;
step S5: and naturally cooling the thermal barrier coating processed in the step S4 to room temperature, and then removing impurities on the surface of the thermal barrier coating cooled to room temperature by using compressed air to complete the processing of the YSZ thermal barrier coating.
Observing the surface of the processed YSZ thermal barrier coating by using a microscope, wherein the surface microscopic topography of the processed YSZ thermal barrier coating is shown in fig. 5, observing the cross-section microscopic topography of the processed YSZ thermal barrier coating by using a Hitachi SU3500 scanning electron microscope, and observing the surface 3D topography of the processed YSZ thermal barrier coating by using a Kinzhi VHX5000 confocal optical microscope, as shown in fig. 6, as shown in fig. 9.
The YSZ thermal barrier coating surface processed in the step S5 is evenly coated with the corrosive, and the coating density is 25mg/cm2The YSZ thermal barrier coating evenly coated with the corrosive is placed in a high-temperature furnace, the temperature of the high-temperature furnace is increased from 23 ℃ to 1100 ℃ at the speed of 3 ℃/min, the temperature is kept for 25 hours, then the temperature is decreased from 1100 ℃ to room temperature at the speed of 5 ℃/min, a hot corrosion experiment is completed, the corrosion morphology of the YSZ thermal barrier coating after the hot corrosion experiment is observed by a microscope, and the experimental result is shown in figure 12.
Example 3
A laser surface treatment method for improving the heat corrosion resistance of a YSZ thermal barrier coating comprises the following steps:
step S1: ultrasonically cleaning the surface of the YSZ thermal barrier coating by adopting an ultrasonic instrument, and adjusting the shape of a light spot of the semiconductor laser to be a rectangle, wherein the size of the light spot is 12mm multiplied by 2 mm;
step S2: the laser power of a semiconductor laserThe ratio was adjusted to 500W, the scanning speed of the semiconductor laser was adjusted to 12mm/s, and the energy density was 7.5J/mm2The low-energy-density laser is adopted to perform self-preheating scanning on the YSZ thermal barrier coating processed in the step S1;
step S3: the laser power of the semiconductor laser was adjusted to 2000W, the scanning speed of the semiconductor laser was adjusted to 28mm/s, and an energy density of 12.8J/mm was obtained2The high-energy-density laser is adopted to carry out remelting scanning on the YSZ thermal barrier coating processed in the step S2;
step S4: the laser power of the semiconductor laser was adjusted to 700W, the scanning speed of the semiconductor laser was adjusted to 12mm/s, and the energy density was 10.5J/mm2The YSZ thermal barrier coating processed in the step S3 is slowly cooled and scanned by the medium energy density laser;
step S5: and naturally cooling the thermal barrier coating processed in the step S4 to room temperature, and then removing impurities on the surface of the thermal barrier coating cooled to room temperature by using compressed air to complete the processing of the YSZ thermal barrier coating.
Comparative example 1
Observing the surface of the untreated YSZ thermal barrier coating by using a microscope, wherein the surface microscopic topography of the untreated YSZ thermal barrier coating is shown in figure 1, and the section microscopic topography of the untreated YSZ thermal barrier coating is observed by using a Hitachi SU3500 scanning electron microscope, which is shown in figure 2. The surface 3D topography of the untreated YSZ thermal barrier coating was observed using a keyston VHX5000 confocal optical microscope, as shown in fig. 7.
Uniformly coating the surface of the untreated YSZ thermal barrier coating with corrosive agent, wherein the coating density is 25mg/cm2The YSZ thermal barrier coating evenly coated with the corrosive is placed in a high-temperature furnace, the temperature of the high-temperature furnace is increased from 23 ℃ to 1100 ℃ at the speed of 3 ℃/min, the temperature is kept for 25 hours, then the temperature is decreased from 1100 ℃ to room temperature at the speed of 5 ℃/min, a hot corrosion experiment is completed, the corrosion morphology of the YSZ thermal barrier coating after the hot corrosion experiment is observed by a microscope, and the experimental result is shown in figure 10.
Comparing fig. 3 and 5 with fig. 1, it can be seen that the treated YSZ thermal barrier coating of example 1 and the treated YSZ thermal barrier coating of example 2 eliminate the rough surface layer of the untreated YSZ thermal barrier coating, and the surface of the treated YSZ thermal barrier coating is very smooth.
Comparing fig. 4 and 6 with fig. 1, it can be seen that the treated YSZ thermal barrier coating of example 1 and the treated YSZ thermal barrier coating of example 2 of the present invention eliminate the inherent porosity and defects in the untreated YSZ thermal barrier coating, and the treated YSZ thermal barrier coating is very dense in the interior.
Comparing fig. 8, fig. 9 and fig. 7, it can be seen that the surfaces of the YSZ thermal barrier coating after treatment in example 1 and the YSZ thermal barrier coating after treatment in example 2 of the present invention are very smooth, the average roughness value of the YSZ thermal barrier coating without treatment is 6-9 μm, and the average roughness value of the YSZ thermal barrier coating after treatment is reduced to 1-3 μm, so that the contact surface area between the corrosive agent and the YSZ material is greatly reduced by the YSZ thermal barrier coating after treatment.
Comparing fig. 11, fig. 12 and fig. 10, the strip-shaped structures in fig. 11, fig. 12 and fig. 10 are corrosion product pure yttrium vanadate crystals, the untreated YSZ thermal barrier coating is severely corroded after a hot corrosion experiment, and the corrosion products are more, disordered and cross-covered; after the treated YSZ thermal barrier coating in the embodiment 1 and the treated YSZ thermal barrier coating in the embodiment 2 are subjected to a hot corrosion experiment, corrosion products are greatly reduced, and the hot corrosion reaction is limited to an extremely shallow surface layer.
From the above results, it can be seen that: the laser surface treatment method for improving the heat corrosion resistance of the thermal barrier coating provided by the invention fully utilizes the flexible and controllable process advantages of a laser, introduces a scanning process comprising self-preheating, remelting and slow cooling, then naturally cools the thermal barrier coating to room temperature, and finally, the surface corrosion degree of the obtained thermal barrier coating is reduced under the action of excessive corrosion molten salt, and the infiltration and erosion of the thermal corrosion molten salt to the interior of the coating are inhibited while the corrosion reaction of the thermal corrosion molten salt on the surface of the YSZ coating is effectively prevented through tissue densification, so that the heat corrosion resistance of the thermal barrier coating is further improved, and the service life of the thermal barrier coating is prolonged.
Those of ordinary skill in the art will understand that: the discussion of any embodiment above is meant to be exemplary only, and is not intended to intimate that the scope of the disclosure, including the claims, is limited to these examples; within the idea of the invention, also technical features in the above embodiments or in different embodiments may be combined and there are many other variations of the different aspects of the invention as described above, which are not provided in detail for the sake of brevity. Therefore, any omissions, modifications, substitutions, improvements and the like that may be made without departing from the spirit and principles of the invention are intended to be included within the scope of the invention.

Claims (3)

1. A laser surface treatment method for improving the heat corrosion resistance of a thermal barrier coating is characterized by comprising the following steps:
step S1: carrying out ultrasonic cleaning on the surface of the thermal barrier coating, and adjusting the shape of a light spot of a laser to be rectangular;
step S2: adjusting a laser to emit low-energy-density laser, and performing self-preheating scanning on the thermal barrier coating processed in the step S1;
step S3: adjusting a laser to emit high-energy-density laser, and performing remelting scanning on the thermal barrier coating processed in the step S2;
step S4: adjusting a laser to emit medium-energy-density laser, and performing slow cooling scanning on the thermal barrier coating processed in the step S3;
step S5: naturally cooling the thermal barrier coating processed in the step S4 to room temperature, and then removing impurities on the surface of the thermal barrier coating cooled to room temperature by using compressed air;
wherein the energy density of the low-energy-density laser in the step S2 is 7.2-7.5J/mm2(ii) a The energy density of the high-energy-density laser in the step S3 is 12.0-12.9J/mm2(ii) a The energy density of the medium-energy-density laser in the step S4 is 10.0-10.8J/mm2。
2. The laser surface treatment method for improving the hot corrosion resistance of a thermal barrier coating according to claim 1, wherein the laser in step S1 is a continuous semiconductor laser.
3. The laser surface treatment method for improving the hot corrosion resistance of a thermal barrier coating according to claim 1, wherein the spot size of the laser in the step S1 is 12mm x 2 mm.
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CN110284095A (en) * 2019-07-15 2019-09-27 马鞍山市智新纳米材料有限公司 A kind of preparation method of ceramics creping doctor
CN111099893B (en) * 2019-12-04 2022-03-22 天津大学 Method for improving melting resistance CMAS corrosion of thermal barrier coating by laser surface treatment

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Publication number Priority date Publication date Assignee Title
CN102352509A (en) * 2011-11-17 2012-02-15 铜陵学院 Method for preparing nano-thick ceramic coating by laser multilayer cladding
CN103266295A (en) * 2013-05-23 2013-08-28 广州有色金属研究院 Laser surfacing modification method for thermal barrier coating
CN107326318A (en) * 2017-06-28 2017-11-07 西安交通大学 A kind of laser remolten thermal barrier coating preparation technology for suppressing single crystal substrate recrystallization

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102352509A (en) * 2011-11-17 2012-02-15 铜陵学院 Method for preparing nano-thick ceramic coating by laser multilayer cladding
CN103266295A (en) * 2013-05-23 2013-08-28 广州有色金属研究院 Laser surfacing modification method for thermal barrier coating
CN107326318A (en) * 2017-06-28 2017-11-07 西安交通大学 A kind of laser remolten thermal barrier coating preparation technology for suppressing single crystal substrate recrystallization

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