CN108220953A - A kind of Laser Surface Treatment method for improving thermal barrier coating heat and corrosion resistant performance - Google Patents

A kind of Laser Surface Treatment method for improving thermal barrier coating heat and corrosion resistant performance Download PDF

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CN108220953A
CN108220953A CN201711447029.4A CN201711447029A CN108220953A CN 108220953 A CN108220953 A CN 108220953A CN 201711447029 A CN201711447029 A CN 201711447029A CN 108220953 A CN108220953 A CN 108220953A
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thermal barrier
laser
barrier coating
energy density
treated
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CN108220953B (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)
  • Organic Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Plasma & Fusion (AREA)
  • Turbine Rotor Nozzle Sealing (AREA)
  • Other Surface Treatments For Metallic Materials (AREA)

Abstract

The invention discloses a kind of Laser Surface Treatment methods for improving thermal barrier coating heat and corrosion resistant performance, belong to the processing technology field of thermal barrier coating.The processing method includes the following steps：Step S1：Thermal barrier coating surface is cleaned by ultrasonic, the light spot shape of laser is adjusted to rectangle；Step S2：Laser transmitting low energy densities laser in set-up procedure S1, carries out from pre-heating scan step S1 treated thermal barrier coatings；Step S3：Laser transmitting high energy density laser in set-up procedure S1, remelting scanning is carried out to step S2 treated thermal barrier coatings；Step S4：Laser transmitting modest energy density laser in set-up procedure S1, slow cooling scanning is carried out to step S3 treated thermal barrier coatings；Step S5：By step S4 treated thermal barrier coating cooled to room temperatures, the impurity of coating surface being then cooled to room temperature using compressed air removing.The smooth densification of coating after treatment inhibits the heat erosion of corrosive salt, extends coating service life.

Description

A kind of Laser Surface Treatment method for improving thermal barrier coating heat and corrosion resistant performance
Technical field
The present invention relates to the processing technology fields of thermal barrier coating, particularly relate to a kind of raising thermal barrier coating heat and corrosion resistant performance Laser Surface Treatment method.
Background technology
Thermal barrier coating has the comprehensive performances such as high-melting-point, low heat conduction coefficient, high-fracture toughness and high thermal expansion coefficient, mesh Before be widely used in aero-engine and gas turbine turbo blade manufacture.Heat barrier coat material huge number, wherein YSZ (Y2O3Stablize ZrO2) heat barrier coat material is the most ripe, is most widely used, often obtained by heat spraying method.It is answered as important One of with, the YSZ thermal barrier coatings in gas turbine are often served in the bad working environments of heat erosion, Na and V impurity is in height in fuel Na is formed under warm combustion gas environment2SO4-V2O5Fused salt, and coating surface is attached to, the fused salt and thermal barrier coating stabilizer Y2O3Occur Chemical reaction generation YVO4, cause tetragonal phase ZrO2Mutually become monoclinic phase ZrO2, with the volume expansion of 3-5%, while corrode production Object YVO4Destruction also mutually is generated to thermal barrier coating, leads to thermal barrier coating cracking and unsticking failure.
At present, surface laser remelting is to improve the important method of thermal barrier coating heat and corrosion resistant, by eliminating in thermal barrier coating The defects of hole, no cofusing particle, forms fine and close columanar structure, so as to prevent the intrusion of corrosivity fused salt.However, existing swash Light Technology For Remelting process procedure is relatively simple, and surface layer heat erosion and the inhibiting effect for penetrating into heat erosion are not obvious.Therefore, it looks for The problem of to a kind of processing method that can improve thermal barrier coating heat/corrosion resistance being this field urgent need to resolve.
Invention content
In view of this, it is an object of the invention to propose at a kind of laser surface for improving thermal barrier coating heat and corrosion resistant performance Reason method, the processing method make full use of the flexible controllable process advantage of laser, introduce and include from heat, remelting and slow cooling Multiple-Scan technique can significantly improve the heat and corrosion resistant performance of thermal barrier coating, extend the service life of thermal barrier coating.
Based on a kind of above-mentioned purpose Laser Surface Treatment side for improving thermal barrier coating heat and corrosion resistant performance provided by the invention Method includes the following steps：
Step S1：Thermal barrier coating surface is cleaned by ultrasonic, the light spot shape of laser is adjusted to rectangle；
Step S2：Laser transmitting low energy densities laser is adjusted, step S1 treated thermal barrier coatings are carried out from pre- Heat scan；
Step S3：Laser transmitting high energy density laser is adjusted, remelting is carried out to step S2 treated thermal barrier coatings Scanning；
Step S4：Laser transmitting modest energy density laser is adjusted, treated that thermal barrier coating delays to step S3 Cold scanning；
Step S5：By step S4 treated thermal barrier coating cooled to room temperatures, then removed using compressed air cold But to the impurity on the thermal barrier coating surface of room temperature.
Preferably, the laser in the step S1 is continuous semiconductor laser.
Preferably, the spot size of laser is 12mm × 2mm in the step S1.
Preferably, the energy density of the low energy densities laser in the step S2 is 7.2~7.5J/mm2.Pass through adjusting The laser power and sweep speed of laser adjust the energy density of laser in 7.2~7.5J/mm2In the range of；Work as use Low energy densities laser from pre-heating scan thermal barrier coating when, be equivalent in advance thermal barrier coating surface apply a relatively low temperature The local preheating on thermal barrier coating surface is realized in field distribution, high caused by heat barrier coat material lower thermal conductivity so as to reduce Temperature gradient, the problem of avoiding the occurrence of subsequent remelting cracking or even come off.
Preferably, the energy density of the high energy density laser in the step S3 is 12.0~12.9J/mm2.Pass through tune The laser power and sweep speed of whole laser adjust the energy density of laser in 12.0~12.9J/mm2In the range of；When When carrying out remelting scanning to the thermal barrier coating from after preheating using high energy density laser, reach the area of heat barrier coat material fusing point Domain forms molten bath, and is moved with light source, realizes that the local dynamic station on thermal barrier coating surface melts, under the process conditions, is melted in molten bath Stream verify fully and stablizes, pool side trailing edge temperature gradient is reduced due to being formed in step S2 from preheating temperature field, it can be with Fine and close remelting surface layer is effectively formed, and at the same time inhibiting the generation of melt tank edge fire check defect.
Preferably, the energy density of the modest energy density laser in the step S4 is 10.0~10.8J/mm2.Pass through The laser power and sweep speed of laser are adjusted, adjusts the energy density of laser in 10.0~10.8J/mm2In the range of； When the thermal barrier coating after being scanned using modest energy density laser to remelting carries out slow cooling scanning, under the process conditions, step Residual thermal stress inside the remelting surface layer formed in S3 and between remelting-heat affected area is concentrated to obtain timely, effective release, Avoid stress cracking failure of the thermal barrier coating under thermal cycle operating mode during follow-up be on active service between remelted layer and non-melt material.
It is provided by the invention improve thermal barrier coating heat and corrosion resistant performance the principle of Laser Surface Treatment method be：Utilize height It spends the laser energy concentrated and prepares a fine and close remelted layer on thermal spraying thermal barrier coating surface, the thickness of the remelted layer of preparation is 100~200 μm, remelted layer can effectively reduce the heat erosion degree on thermal barrier coating surface, can more prevent heat erosion fused salt It penetrates into；By the laser of the increase low energy densities before remelting from pre-heating technique link, and it is close to increase medium energy after reflow The laser retarded cooling process link of degree improves compactness extent and then improves the corrosion resistance of remelted layer.
The present invention treated thermal barrier coating carries out heat erosion experiment, i.e., after corrosive agent being deployed into paste, uniformly coats In thermal barrier coating surface, coating density is 25~30mg/cm2, and the corrosive agent coating density of conventional heat erosion experiment is generally 20mg/cm2, i.e., when the present invention carries out heat erosion experiment, the coating density of corrosive agent is significantly higher than the painting of conventional heat erosion experiment Cover density.
It is as follows that the present invention carries out the corrosive agent used during heat erosion experiment configuration：By five oxidations that mass percent is 55% The sodium sulphate that two vanadium and mass percent are 45% mixes, and then adds in deionized water, be made into mass percent concentration for 40~ 50% paste corrosion fused salt.
Heat erosion experimentation of the present invention is：The thermal barrier coating for coating homogeneous corrosion agent is placed in high temperature furnace, by 23 DEG C 1100 DEG C are warming up to the speed of 3 DEG C/min, 25 hours is kept the temperature, room temperature is then cooled to by 1100 DEG C of speed with 5 DEG C/min, Complete heat erosion experiment.
From the above it can be seen that the advantages of the present invention are：
The Laser Surface Treatment method provided by the invention for improving thermal barrier coating heat and corrosion resistant performance, makes full use of laser Flexibly controllable process advantage introduces the scanning process included from preheating, remelting and slow cooling, then by thermal barrier coating natural cooling To room temperature, under the action of excess corrodes fused salt, surface layer extent of corrosion reduces the thermal barrier coating finally obtained, and passes through tissue Densification significantly inhibits the infiltration of corrosion fused salt, further improves the heat and corrosion resistant performance of thermal barrier coating, extends thermal barrier coating Service life.
Description of the drawings
Fig. 1 is the surface microstructure figure of untreated YSZ thermal barrier coatings；
Fig. 2 is the section microstructure figure of untreated YSZ thermal barrier coatings；
Fig. 3 is the surface microstructure figure of treated YSZ thermal barrier coatings in the embodiment of the present invention 1；
Fig. 4 is the section microstructure figure of treated YSZ thermal barrier coatings in the embodiment of the present invention 1；
Fig. 5 is the surface microstructure figure of treated YSZ thermal barrier coatings in the embodiment of the present invention 2；
Fig. 6 is the section microstructure figure of treated YSZ thermal barrier coatings in the embodiment of the present invention 2；
Fig. 7 is the surface 3D shape appearance figures of untreated YSZ thermal barrier coatings；
Fig. 8 is the surface 3D shape appearance figures of treated YSZ thermal barrier coatings in the embodiment of the present invention 1；
Fig. 9 is the surface 3D shape appearance figures of treated YSZ thermal barrier coatings in the embodiment of the present invention 2；
Figure 10 is untreated YSZ thermal barrier coatings heat erosion rear surface shape appearance figure；
Figure 11 is treated YSZ thermal barrier coating heat erosion rear surface shape appearance figures in the embodiment of the present invention 1；
Figure 12 is treated YSZ thermal barrier coating heat erosion rear surface shape appearance figures in the embodiment of the present invention 2.
Specific embodiment
To make the objectives, technical solutions, and advantages of the present invention clearer, below in conjunction with specific embodiment, and reference Attached drawing, the present invention is described in more detail.
It should be noted that all statements for using " first " and " second " are for differentiation two in the embodiment of the present invention The non-equal entity of a same names or non-equal parameter, it is seen that " first " " second " should not only for the convenience of statement The restriction to the embodiment of the present invention is interpreted as, subsequent embodiment no longer illustrates this one by one.
In the present invention by taking YSZ thermal barrier coatings as an example, to YSZ thermal barrier coatings improve the place of thermal barrier coating heat/corrosion resistance Reason.It using mass fraction is 7~8% Yttria stabilized zirconia as heat barrier coat material that YSZ thermal barrier coatings, which are, using heat Spraying method obtains.
First, embodiment
Embodiment 1
A kind of Laser Surface Treatment method for improving YSZ thermal barrier coating heat and corrosion resistant performances, includes the following steps：
Step S1：YSZ thermal barrier coatings surface is cleaned by ultrasonic using Ultrasound Instrument, and by the hot spot of semiconductor laser Adjusting Shape is rectangle, and spot size is 12mm × 2mm；
Step S2：The laser power of semiconductor laser is adjusted to 400W, by the sweep speed tune of semiconductor laser Whole is 10mm/s, and acquisition energy density is 7.2J/mm2Low energy densities laser, using the low energy densities laser to step S1 treated YSZ thermal barrier coatings are carried out from pre-heating scan；
Step S3：The laser power of semiconductor laser is adjusted to 1800W, by the sweep speed tune of semiconductor laser Whole is 20mm/s, and acquisition energy density is 12J/mm2High energy density laser, using the high energy density laser to step S2 Treated, and YSZ thermal barrier coatings carry out remelting scanning；
Step S4：The laser power of semiconductor laser is adjusted to 600W, by the sweep speed tune of semiconductor laser Whole is 10mm/s, and acquisition energy density is 10.8J/mm2Modest energy density laser, using the modest energy density laser pair Step S3 treated YSZ thermal barrier coatings carry out slow cooling scanning；
Step S5：By step S4 treated thermal barrier coating cooled to room temperatures, then gone out using compressed air cold But to the impurity on the thermal barrier coating surface of room temperature, the processing of YSZ thermal barrier coatings is completed.
Using the surface of microscopic treated YSZ thermal barrier coatings, the surface of treated YSZ thermal barrier coatings is micro- Shape appearance figure is as shown in figure 3, using Hitachi's SU3500 scanning electron microscope to the micro- shape in section of treated YSZ thermal barrier coatings Looks are observed, as shown in Figure 4.Using 5000 confocal optics microscopes of Keyemce VHX to treated YSZ thermal barrier coatings Surface 3D patterns observed, as shown in Figure 8.
In step S5 treated YSZ thermal barrier coatings surface uniformly coats corrosive agent, coating density is 30mg/cm2, will be equal The YSZ thermal barrier coatings of even coating corrosive agent are positioned in high temperature furnace, and high temperature furnace is warming up to 1100 by 23 DEG C of speed with 3 DEG C/min DEG C, 25 hours are kept the temperature, room temperature is then cooled to by 1100 DEG C of speed with 5 DEG C/min, completes heat erosion experiment, and use microscope The erosion profile of the YSZ thermal barrier coatings after heat erosion experiment is observed, experimental result is as shown in figure 11.
Embodiment 2
A kind of Laser Surface Treatment method for improving YSZ thermal barrier coating heat and corrosion resistant performances, includes the following steps：
Step S1：YSZ thermal barrier coatings surface is cleaned by ultrasonic using Ultrasound Instrument, and by the hot spot of semiconductor laser Adjusting Shape is rectangle, and spot size is 12mm × 2mm；
Step S2：The laser power of semiconductor laser is adjusted to 300W, by the sweep speed tune of semiconductor laser Whole is 8mm/s, and acquisition energy density is 7.7J/mm2Low energy densities laser, using the low energy densities laser to step S1 Treated, and YSZ thermal barrier coatings are carried out from pre-heating scan；
Step S3：The laser power of semiconductor laser is adjusted to 1500W, by the sweep speed tune of semiconductor laser Whole is 15mm/s, and acquisition energy density is 12.9J/mm2High energy density laser, using the high energy density laser to step S2 treated YSZ thermal barrier coatings carry out remelting scanning；
Step S4：The laser power of semiconductor laser is adjusted to 500W, by the sweep speed tune of semiconductor laser Whole is 9mm/s, and acquisition energy density is 10J/mm2Modest energy density laser, using the modest energy density laser to step Treated that YSZ thermal barrier coatings carry out slow cooling scanning by rapid S3；
Step S5：By step S4 treated thermal barrier coating cooled to room temperatures, then gone out using compressed air cold But to the impurity on the thermal barrier coating surface of room temperature, the processing of YSZ thermal barrier coatings is completed.
Using the surface of microscopic treated YSZ thermal barrier coatings, the surface of treated YSZ thermal barrier coatings is micro- Shape appearance figure is as shown in figure 5, using Hitachi's SU3500 scanning electron microscope to the micro- shape in section of treated YSZ thermal barrier coatings Looks are observed, as shown in fig. 6, using 5000 confocal optics microscopes of Keyemce VHX to treated YSZ thermal barrier coatings Surface 3D patterns observed, as shown in Figure 9.
In step S5 treated YSZ thermal barrier coatings surface uniformly coats corrosive agent, coating density is 25mg/cm2, will be equal The YSZ thermal barrier coatings of even coating corrosive agent are positioned in high temperature furnace, and high temperature furnace is warming up to 1100 by 23 DEG C of speed with 3 DEG C/min DEG C, 25 hours are kept the temperature, room temperature is then cooled to by 1100 DEG C of speed with 5 DEG C/min, completes heat erosion experiment, and use microscope The erosion profile of the YSZ thermal barrier coatings after heat erosion experiment is observed, experimental result is as shown in figure 12.
Embodiment 3
A kind of Laser Surface Treatment method for improving YSZ thermal barrier coating heat and corrosion resistant performances, includes the following steps：
Step S1：YSZ thermal barrier coatings surface is cleaned by ultrasonic using Ultrasound Instrument, and by the hot spot of semiconductor laser Adjusting Shape is rectangle, and spot size is 12mm × 2mm；
Step S2：The laser power of semiconductor laser is adjusted to 500W, by the sweep speed tune of semiconductor laser Whole is 12mm/s, and acquisition energy density is 7.5J/mm2Low energy densities laser, using the low energy densities laser to step S1 treated YSZ thermal barrier coatings are carried out from pre-heating scan；
Step S3：The laser power of semiconductor laser is adjusted to 2000W, by the sweep speed tune of semiconductor laser Whole is 28mm/s, and acquisition energy density is 12.8J/mm2High energy density laser, using the high energy density laser to step S2 treated YSZ thermal barrier coatings carry out remelting scanning；
Step S4：The laser power of semiconductor laser is adjusted to 700W, by the sweep speed tune of semiconductor laser Whole is 12mm/s, and acquisition energy density is 10.5J/mm2Modest energy density laser, using the modest energy density laser pair Step S3 treated YSZ thermal barrier coatings carry out slow cooling scanning；
Step S5：By step S4 treated thermal barrier coating cooled to room temperatures, then gone out using compressed air cold But to the impurity on the thermal barrier coating surface of room temperature, the processing of YSZ thermal barrier coatings is completed.
Comparative example 1
Using the surface of the untreated YSZ thermal barrier coatings of microscopic, the surface of untreated YSZ thermal barrier coatings is shown Micromorphology figure is as shown in Figure 1, show the section of untreated YSZ thermal barrier coatings using Hitachi's SU3500 scanning electron microscope Micromorphology is observed, as shown in Figure 2.Using Keyemce VHX5000 confocal optics microscope to untreated YSZ thermal boundarys The surface 3D patterns of coating are observed, as shown in Figure 7.
Untreated YSZ thermal barrier coatings surface is uniformly coated into corrosive agent, coating density is 25mg/cm2, will uniformly apply The YSZ thermal barrier coatings for covering corrosive agent are positioned in high temperature furnace, and high temperature furnace is warming up to 1100 DEG C by 23 DEG C of speed with 3 DEG C/min, Then heat preservation 25 hours is cooled to room temperature by 1100 DEG C of speed with 5 DEG C/min, complete heat erosion experiment, and seen with microscope The erosion profile of YSZ thermal barrier coatings after calorimetric corrosion experiment, experimental result are as shown in Figure 10.
Fig. 3, Fig. 5 and Fig. 1 are compared to the YSZ thermal barrier coatings as can be seen that in the embodiment of the present invention 1 after treatment The roughened finish of untreated YSZ thermal barrier coatings is eliminated with the YSZ thermal barrier coatings in embodiment 2 after treatment, is passed through The surface of treated YSZ thermal barrier coatings is very smooth.
Fig. 4, Fig. 6 and Fig. 1 are compared to the YSZ thermal barrier coatings as can be seen that in the embodiment of the present invention 1 after treatment The intrinsic hole inside untreated YSZ thermal barrier coatings is eliminated with the YSZ thermal barrier coatings in embodiment 2 after treatment And defect, the inside of YSZ thermal barrier coatings after treatment are very fine and close.
By Fig. 8, Fig. 9 as can be seen that YSZ thermal barrier coatings after treatment and reality in the embodiment of the present invention 1 compared with Fig. 7 The surface for applying the YSZ thermal barrier coatings in example 2 after treatment is very smooth, the average roughness of untreated YSZ thermal barrier coatings Angle value is 6~9 μm, and the average roughness value of YSZ thermal barrier coatings after treatment is reduced to 1~3 μm, so as to by place YSZ thermal barrier coatings after reason greatly reduce the contact surface area of corrosive agent and YSZ materials.
Figure 11, Figure 12 and Figure 10 are compared, the strip structure in Figure 11, Figure 12, Figure 10 is the pure vanadium of corrosion product Sour yttrium crystal, untreated YSZ thermal barrier coatings are serious by heat erosion experiment post-etching, and corrosion product is more and mixed and disorderly, hands over Fork covering；And the YSZ thermal boundarys in the YSZ thermal barrier coatings and embodiment 2 in the embodiment of the present invention 1 after treatment after treatment After heat erosion is tested, corrosion product is greatly reduced coating, and heat erosion reaction is limited in extremely shallow surface layer.
By the above results it can be seen that：The Laser Surface Treatment provided by the invention for improving thermal barrier coating heat and corrosion resistant performance Method makes full use of the flexible controllable process advantage of laser, introduces the scanning process included from preheating, remelting and slow cooling, so Afterwards by thermal barrier coating cooled to room temperature, for the thermal barrier coating finally obtained under the action of excess corrodes fused salt, surface layer is rotten Degree of corrosion reduces, and passes through dense structure and heat erosion fused salt is effectively prevented to inhibit while YSZ coating surface corrosion reactions Its infiltration to coat inside is corroded, and further improves the heat and corrosion resistant performance of thermal barrier coating, extends the use of thermal barrier coating Service life.
Those of ordinary skills in the art should understand that：The discussion of any of the above embodiment is exemplary only, not It is intended to imply that the scope of the present disclosure is limited to these examples (including claim)；Under the thinking of the present invention, above example Or it can also be combined between the technical characteristic in different embodiments, and there is different aspect present invention as described above Many other variations, in order to it is concise they do not provided in details.Therefore, all within the spirits and principles of the present invention, Any omission for being made, modification, equivalent replacement, improvement etc., should all be included in the protection scope of the present invention.

Claims (6)

  1. A kind of 1. Laser Surface Treatment method for improving thermal barrier coating heat and corrosion resistant performance, which is characterized in that include the following steps：
    Step S1：Thermal barrier coating surface is cleaned by ultrasonic, the light spot shape of laser is adjusted to rectangle；
    Step S2：Laser transmitting low energy densities laser is adjusted, step S1 treated thermal barrier coatings swept from preheating It retouches；
    Step S3：Laser transmitting high energy density laser is adjusted, remelting scanning is carried out to step S2 treated thermal barrier coatings；
    Step S4：Laser transmitting modest energy density laser is adjusted, carrying out slow cooling to step S3 treated thermal barrier coatings sweeps It retouches；
    Step S5：By step S4 treated thermal barrier coating cooled to room temperatures, then it is cooled to using compressed air removing The impurity on the thermal barrier coating surface of room temperature.
  2. 2. the Laser Surface Treatment method according to claim 1 for improving thermal barrier coating heat and corrosion resistant performance, feature exist In the laser in the step S1 is continuous semiconductor laser.
  3. 3. the Laser Surface Treatment method according to claim 1 for improving thermal barrier coating heat and corrosion resistant performance, feature exist In the spot size of laser is 12mm × 2mm in the step S1.
  4. 4. the Laser Surface Treatment method according to claim 1 for improving thermal barrier coating heat and corrosion resistant performance, feature exist In the energy density of the low energy densities laser in the step S2 is 7.2~7.5J/mm2。
  5. 5. the Laser Surface Treatment method according to claim 1 for improving thermal barrier coating heat and corrosion resistant performance, feature exist In the energy density of the high energy density laser in the step S3 is 12.0~12.9J/mm2。
  6. 6. the Laser Surface Treatment method according to claim 1 for improving thermal barrier coating heat and corrosion resistant performance, feature exist In the energy density of the modest energy density laser in the step S4 is 10.0~10.8J/mm2。
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Cited By (3)

* Cited by examiner, † Cited by third party
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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
CN111099893A (en) * 2019-12-04 2020-05-05 天津大学 Method for improving melting resistance CMAS corrosion of thermal barrier coating by laser surface treatment
CN115945465A (en) * 2023-02-01 2023-04-11 南昌航空大学 Method for removing zirconia thermal barrier coating

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CN102352509B (en) * 2011-11-17 2013-06-26 铜陵学院 Method for preparing nano-thick ceramic coating by laser multilayer cladding
CN103266295B (en) * 2013-05-23 2015-10-07 广州有色金属研究院 A kind of thermal barrier coating by laser surface modifying method
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

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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
CN111099893A (en) * 2019-12-04 2020-05-05 天津大学 Method for improving melting resistance CMAS corrosion of thermal barrier coating by laser surface treatment
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
CN115945465A (en) * 2023-02-01 2023-04-11 南昌航空大学 Method for removing zirconia thermal barrier coating

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