CN115627438A - Method for improving oxidation resistance of metal bonding layer of thermal barrier coating - Google Patents

Method for improving oxidation resistance of metal bonding layer of thermal barrier coating Download PDF

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Publication number
CN115627438A
CN115627438A CN202211350147.4A CN202211350147A CN115627438A CN 115627438 A CN115627438 A CN 115627438A CN 202211350147 A CN202211350147 A CN 202211350147A CN 115627438 A CN115627438 A CN 115627438A
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bonding layer
oxidation resistance
thermal barrier
barrier coating
laser
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李长久
张从杨
雒晓涛
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Xian Jiaotong University
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Xian Jiaotong University
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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
    • C23C4/00—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge
    • C23C4/12—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge characterised by the method of spraying
    • C23C4/134—Plasma spraying
    • 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
    • C23C4/02—Pretreatment of the material to be coated, e.g. for coating on selected surface areas
    • 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
    • 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
    • C23C4/12—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge characterised by the method of spraying
    • C23C4/129—Flame spraying

Abstract

The invention discloses a method for improving the oxidation resistance of a metal bonding layer of a thermal barrier coating, which comprises the steps of firstly preparing the bonding layer on the surface of a high-temperature alloy substrate, then adopting pulse laser to treat the bonding layer, remelting splash particles on the surface of the bonding layer, solving the problem of poor contact between the splash particles and the bonding layer substrate, and finally preparing a ceramic heat-insulating layer on the surface of the bonding layer, thereby realizing the formation of single and uniform alpha-Al on the surface of the bonding layer in the subsequent service process 2 O 3 The purpose of effectively improving the oxidation resistance of the bonding layer and the service life of the thermal barrier coating is achieved.

Description

Method for improving oxidation resistance of metal bonding layer of thermal barrier coating
Technical Field
The invention belongs to the technical field of preparation of metal thermal barrier coatings, and particularly relates to a method for improving the oxidation resistance of a metal bonding layer of a thermal barrier coating.
Background
As gas turbine technology continues to evolve, higher and higher turbine inlet temperatures present greater challenges to the thermal endurance limit of the turbine blade material. Thermal barrier coatings are thermal barrier coatings for gas turbine blades that, in cooperation with film cooling techniques on the turbine blade surface, effectively reduce the turbine blade surface temperature. Thermal barrier coatings typically include a metallic bond coat and a ceramic thermal barrier layer, where the ceramic layer serves as a thermal barrier and the bond coat serves as a high temperature oxidation resistance. In addition, during the high-temperature service of the thermal barrier coating, because the porous ceramic heat-insulating layer cannot block the oxygen, an oxide film called Thermal Growth Oxide (TGO) is generated on the surface of the metal bonding layer.
Studies have shown that the growth rate of TGO is an important reason for controlling the lifetime of thermal barrier coatings for gas turbines. Using the commonly used bond coat material MCrAlY as an example, TGO is usually of two types, one being dense, slow growing alpha-Al 2 O 3 (ii) a The other is a loose porous mixed oxide with a high growth rate. If the service life of the gas turbine is obviously prolonged, the TGO needs to be controlled to be a single alumina film, so that the growth speed of the TGO is slowed down, and the service life of the thermal barrier coating is prolonged.
At present, the thermal spraying preparation method of the MCrAlY bonding layer mainly comprises low-pressure plasma spraying and supersonic flame spraying, the surfaces of the bonding layers prepared by the two spraying methods are both composed of semi-molten particles, and the method has important significance for improving the surface roughness of the bonding layer and enhancing the mechanical locking function between the bonding layer and a ceramic layer; simultaneously again because the mode of hot spraying can make MCrAlY particle melt or semi-molten, when the molten drop collided the base member, the inevitable phenomenon of splashing produced, the granule that splashes can deposit on tie coat surface around, this kind of granule that splashes is the weak bonding with the tie coat base member, this can lead to in subsequent high temperature service process, after the Al element in the granule that splashes preferentially consumes totally, the Al element of granule below splashes can't be transmitted through the weak bonding interface, then just can generate mixed oxide, mixed oxide of rapid growth can make the premature inefficacy of thermal barrier coating. Therefore, on the premise of not damaging the integral surface roughness of the bonding layer, how to effectively solve the problem of weak bonding between the splashing particles and the bonding layer substrate is a key factor for effectively improving the oxidation resistance of the bonding layer and prolonging the service life of the thermal barrier coating.
In the prior art, the oxidation resistance of the bonding layer is improved by promoting the selective oxidation of an oxide film on the surface of the bonding layer by mainly using methods such as mixing the components of the powder material of the bonding layer, increasing the Al/Ni ratio, plating an Al film on the surface of the bonding layer and the like, and the method has high cost and complex operation. Therefore, a method for improving the oxidation resistance of the bonding layer, which is simple to operate and low in cost, aiming at commercial powder is needed.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention aims to provide a method for improving the oxidation resistance of a metal bonding layer of a thermal barrier coating, which can effectively solve the problem of weak bonding between splashing particles and a bonding layer substrate, thereby effectively improving the oxidation resistance of the bonding layer and the service life of the thermal barrier coating.
In order to achieve the purpose, the invention adopts the following technical scheme to realize the purpose:
the invention discloses a method for improving the oxidation resistance of a metal bonding layer of a thermal barrier coating, which comprises the following steps:
s1: preparing a nickel-based or cobalt-based metal bonding layer on the surface of a nickel-based superalloy substrate by adopting a thermal spraying method;
s2: carrying out laser scanning treatment on the surface of the bonding layer, remelting splashed particles on the surface of the bonding layer, and eliminating weak combination of the splashed particles and the surface of the bonding layer;
s3: and (3) preparing a ceramic heat insulation layer on the surface of the test piece obtained through the S2 treatment.
Preferably, in S1, the thermal spray method for preparing the metal bonding layer employs a low pressure plasma spray method or a supersonic flame spray method.
Preferably, in S1, the powder component elements of the prepared metal bonding layer include Co, cr, ni, al, and Y.
Preferably, in S1, the nickel-based or cobalt-based metal bonding layer is prepared to have a thickness of 80 to 150 μm.
Preferably, in S2, a pulsed laser is used for laser scanning treatment, the power of the laser is between 50W and 200W, the peak power is more than 10kW, and the pulse width is less than 10 mus.
Further preferably, the horizontal angle between the laser and the sample is set to 45-60 °.
Preferably, in S2, the laser frequency is 100-200K, the scanning speed is 5-15mm/S, the laser is scanned three times, and the sample surface normal direction is taken as an axis, and the laser rotates 120 degrees along the axis each time.
Preferably, in S2, the laser scanning process is performed under an argon atmosphere.
Preferably, in S2, the remelting depth is 1 to 3 μm.
Preferably, in S2, the thickness of the prepared ceramic heat-insulating layer is 100-350 μm.
Compared with the prior art, the invention has the following beneficial effects:
the invention discloses a method for improving the oxidation resistance of a metal bonding layer of a thermal barrier coating, which comprises the steps of firstly preparing the bonding layer on the surface of a high-temperature alloy substrate, then adopting pulse laser to treat the bonding layer, remelting splash particles on the surface of the bonding layer, solving the problem of poor contact between the splash particles and the bonding layer substrate, and finally preparing a ceramic thermal insulation layer on the surface of the bonding layer, thereby realizing the formation of single and uniform alpha-Al on the surface of the bonding layer in the subsequent service process 2 O 3 The purpose of the method is to effectively improve the oxidation resistance of the bonding layer and the service life of the thermal barrier coating. Experiments prove that an oxidation weight gain experiment is carried out on two types of samples (the bonding layer after laser treatment and the bonding layer without laser treatment) for 200 hours at 1100 ℃ in an atmospheric environment, and compared with the bonding layer without laser treatment, the oxidation resistance of the bonding layer after laser treatment is improved by more than 40%.
Further, in order to avoid the vertical reflection of the laser from damaging the lens of the laser, the horizontal angle between the laser and the sample is set to be 45-60 degrees.
Further, in order to ensure that all the spattered particles on the surface of the bonding layer can be remelted, the laser frequency is selected to be 100-200K, the scanning speed is 5-15mm/s, the laser scanning is carried out three times, the normal direction of the surface of the sample is taken as an axis, and the laser is rotated by 120 degrees along the axis every time in order to completely remelt the spattered particles on the surface of the sample into the bonding layer matrix as far as possible.
Further, in order to avoid the secondary oxidation problem during the laser processing, it is necessary to perform the argon gas protection while the laser processing is performed, so as to reduce or eliminate the secondary oxidation problem caused by the laser processing.
Drawings
FIG. 1 is a process flow diagram of the present invention
FIG. 2 is an SEM image of the bonding surface before and after laser treatment; wherein (a) is a picture of the surface of the bonding layer which is not subjected to laser treatment, and the surface has more splashing particles; (b) Remelting surface spattering particles of a picture on the surface of the bonding layer subjected to laser treatment;
FIG. 3 is a SEM image of a cross-section of the bonding layer after pre-oxidation treatment before and after laser treatment; wherein, (a) is the cross section of the bonding layer after direct oxidation without laser treatment, the oxidation condition is serious, and obvious composite oxide is generated; (b) The cross section of the bonding layer is oxidized after laser treatment, the oxidation condition is better, and no obvious composite oxide is found.
Detailed Description
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 sequences other than those illustrated or described herein. Furthermore, 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 is described in further detail below with reference to the accompanying drawings:
referring to fig. 1, the preparation process of the present invention comprises:
firstly, preparing a nickel-based or cobalt-based metal bonding layer with the thickness of 80-150 mu m on the surface of a high-temperature alloy substrate by adopting a thermal spraying technology;
then, a pulse laser is adopted to carry out laser scanning treatment on the surface of the bonding layer, and the splashing particles on the surface of the bonding layer are remelted to eliminate the weak combination of the splashing particles and the surface of the bonding layer;
finally, preparing a ceramic heat-insulating layer with the thickness of 100-350um on the surface of the test piece by adopting one of an atmospheric plasma spraying technology, a plasma spraying-physical vapor deposition technology or an electron beam physical vapor deposition technology;
example 1
The nickel-based high-temperature alloy IN718 with the diameter of 25.4mm and the thickness of 2.5mm is selected as a high-temperature alloy substrate, sand blasting is carried out on the surface of the substrate, the surface roughness is improved, and the binding force between the bonding layer and the substrate is improved. And preparing a NiCoCrAlY metal bonding layer with the thickness of 120 mu m on the surface of the high-temperature alloy substrate by adopting a low-pressure plasma spraying technology. The technical parameters of the low-pressure plasma spraying are as follows: the working pressure is 5000Pa-8000Pa, the spraying power is 40KW, the argon flow is 40SLPM, the hydrogen flow is 4.5SLPM, and the spraying distance is 250mm.
The bonding layer surface is processed by adopting a pulse laser with the average power of 100W, the frequency of the laser is 100K, the scanning speed is 10mm/s, and the laser is scanned three times and rotates 120 degrees at each time. And observing the surface morphology of the bonding layer before and after laser treatment under a scanning electron microscope. Two samples with only bonding layer were subjected to an oxidation weight gain test at 1100 ℃ for 200 hours. The experimental results obtainedThe average weight gain rate was: the control group (sample not subjected to laser treatment) was 0.2017g/m 2 h, the experimental group (laser surface treatment remelted sample) is 0.1105g/m 2 h, the oxidation resistance is improved by 45 percent.
And finally, preparing the 8YSZ ceramic heat insulation layer with the thickness of 250 mu m on the surface of the rest test piece by utilizing atmospheric plasma spraying. The parameters of the atmospheric plasma spraying were as follows: the spraying power is 42KW, the argon flow is 60SLPM, the hydrogen flow is 4SLPM, the powder feeding flow is 7.5SLPM, and the spraying distance is 80mm.
Example 2
The nickel-based high-temperature alloy IN718 with the diameter of 25.4mm and the thickness of 2.5mm is selected as a high-temperature alloy substrate, and sand blasting treatment is performed on the surface of the substrate, so that the surface roughness is improved, and the binding force between the bonding layer and the substrate is improved. And (3) preparing a CoNiCrAlY metal bonding layer with the thickness of 150 mu m on the surface of the high-temperature alloy by adopting supersonic flame spraying. The technical parameters of the supersonic flame spraying are as follows: oxygen flow 1950SCFH, kerosene flow 6GPH, spraying distance 380mm, powder feeder rotation speed 5RPM.
The bonding layer surface was treated with a pulsed laser with an average power of 80W, the frequency of the laser was 150K, the scanning speed was 10mm/s, and the rotation was 120 ° for three scans. And observing the surface morphology of the bonding layer before and after laser treatment under a scanning electron microscope. Two samples with only bonding layer were subjected to oxidation weight gain test at 1100 deg.C for 200 hr. The average weight gain rate obtained by the experimental result is as follows: the control group (sample not subjected to laser treatment) was 0.1986g/m 2 h, the experimental group (laser surface treatment remelted specimen) is 0.0978g/m 2 h, the oxidation resistance is improved by 50 percent.
Finally, an 8YSZ ceramic heat-insulating layer with the thickness of about 250 mu m is prepared on the surface of the rest sample by utilizing the atmospheric plasma spraying technology. The specific spraying parameters are as follows: the spraying power is 42KW, the argon flow is 60SLPM, the hydrogen flow is 4SLPM, the powder feeding flow is 7.5SLPM, and the spraying distance is 80mm.
As can be seen from FIG. 2, the bonding layer prepared by supersonic flame spraying has more splashing particles on the surface of the bonding layer without laser treatment, and the splashing particles on the surface of the bonding layer after laser treatment are remelted. Fig. 3 is a cross-sectional view of the adhesive layer after heat treatment, in which (a) is a photograph of a cross-section of the adhesive layer after heat treatment without laser treatment, and the formation of a complex oxide is observed, and (b) is a photograph of a cross-section of the adhesive layer after laser treatment and heat treatment, and the formation of a significant complex oxide is not observed.
Example 3
The nickel-based high-temperature alloy IN718 with the diameter of 25.4mm and the thickness of 2.5mm is selected as a high-temperature alloy substrate, sand blasting is carried out on the surface of the substrate, the surface roughness is improved, and the binding force between the bonding layer and the substrate is improved. And preparing a NiCoCrAlY metal bonding layer with the thickness of 120 mu m on the surface of the high-temperature alloy substrate by adopting a low-pressure plasma spraying technology. The technical parameters of the low-pressure plasma spraying are as follows: the spraying power is 40KW, the argon flow is 40SLPM, the hydrogen flow is 4.5SLPM, and the spraying distance is 250mm.
The adhesive layer surface was treated with a pulsed laser having an average power of 100W, a laser frequency of 150K, a scanning speed of 10mm/s, three scans and a rotation of 120 ℃ each. And observing the surface morphology of the bonding layer before and after laser treatment under a scanning electron microscope. Two samples with only bonding layer were subjected to an oxidation weight gain test at 1100 ℃ for 200 hours. The average weight gain rate obtained by the experimental result is as follows: the control (sample not subjected to laser treatment) was 0.2234g/m 2 h, the experimental group (laser surface treatment remelted coupon) was 0.1026g/m 2 h, the oxidation resistance is improved by 54 percent.
Finally, an 8YSZ ceramic thermal insulation layer with the thickness of about 250 mu m is prepared on the surface of the rest of the sample by utilizing an atmospheric plasma spraying technology. The specific spraying parameters are as follows: the spraying power is 42KW, the argon flow is 60SLPM, the hydrogen flow is 4SLPM, the powder feeding flow is 7.5SLPM, and the spraying distance is 80mm.
Example 4
The nickel-based high-temperature alloy IN718 with the diameter of 25.4mm and the thickness of 2.5mm is selected as a high-temperature alloy substrate, sand blasting is carried out on the surface of the substrate, the surface roughness is improved, and the binding force between the bonding layer and the substrate is improved. And (3) preparing a CoNiCrAlY metal bonding layer with the thickness of 150 mu m on the surface of the high-temperature alloy by adopting supersonic flame spraying. The technical parameters of the supersonic flame spraying are as follows: oxygen flow 1950SCFH, kerosene flow 6GPH, spraying distance 380mm, powder feeder rotation speed 5RPM.
The adhesive layer surface was treated with a pulsed laser having an average power of 80W, a laser frequency of 100K, a scanning speed of 10mm/s, three scans and a rotation of 120 ° each. The surface morphology of the bonding layer before and after laser treatment was observed under a scanning electron microscope. Two samples with only bonding layer were subjected to an oxidation weight gain test at 1100 ℃ for 200 hours. The average weight gain rate obtained by the experimental result is as follows: the control (laser-untreated sample) was 0.2021g/m 2 h, the experimental group (laser surface treatment remelted specimen) is 0.1006g/m 2 h, the oxidation resistance is improved by 50 percent.
And finally, preparing an 8YSZ ceramic heat-insulating layer with the thickness of about 250um on the surface of the rest sample by utilizing an atmospheric plasma spraying technology. The specific spraying parameters are as follows: the spraying power is 42KW, the argon flow is 60SLPM, the hydrogen flow is 4SLPM, the powder feeding flow is 7.5SLPM, and the spraying distance is 80mm.
In conclusion, the invention is based on the characteristics of short single pulse duration, low average power and high peak power of the pulse laser, and the adoption of the pulse laser to treat the surface of the bonding layer can effectively remelt the splashing particles into the bonding layer matrix and can ensure that the surface roughness of the bonding layer is not greatly changed. Therefore, the scheme of the invention adopts the pulse laser to treat the surface of the bonding layer for remelting the splash particles, solves the problem of weak combination of the splash particles and the bonding layer matrix, and realizes the formation of single and uniform alpha-Al on the surface of the bonding layer in the subsequent service process 2 O 3 And the oxidation resistance of the bonding layer and the service life of the thermal barrier coating are improved.
The above-mentioned contents are only for illustrating the technical idea of the present invention, and the protection scope of the present invention is not limited thereby, and any modification made on the basis of the technical idea of the present invention falls within the protection scope of the claims of the present invention.

Claims (10)

1. A method for improving the oxidation resistance of a metal bonding layer of a thermal barrier coating is characterized by comprising the following steps:
s1: preparing a nickel-based or cobalt-based metal bonding layer on the surface of a nickel-based superalloy substrate by adopting a thermal spraying method;
s2: carrying out laser scanning treatment on the surface of the bonding layer, remelting splashed particles on the surface of the bonding layer, and eliminating weak combination of the splashed particles and the surface of the bonding layer;
s3: and (3) preparing a ceramic heat insulation layer on the surface of the test piece obtained by the S2 treatment.
2. The method for improving the oxidation resistance of the metallic bonding layer of the thermal barrier coating according to claim 1, wherein in S1, the thermal spraying method for preparing the metallic bonding layer is a low pressure plasma spraying method or a supersonic flame spraying method.
3. The method for improving the oxidation resistance of the metallic bonding layer of the thermal barrier coating as claimed in claim 1, wherein in S1, the powder component elements of the metallic bonding layer are prepared to include Co, cr, ni, al and Y.
4. The method for improving the oxidation resistance of the metallic bonding layer of the thermal barrier coating as claimed in claim 1, wherein the thickness of the nickel-based or cobalt-based metallic bonding layer prepared in S1 is 80-150 μm.
5. The method for improving the oxidation resistance of the metal bonding layer of the thermal barrier coating according to claim 1, wherein in S2, a pulsed laser is used for laser scanning, the power of the laser is 50W-200W, the peak power is greater than 10kW, and the pulse width is less than 10 μ S.
6. The method for improving the oxidation resistance of the metallic bonding layer of the thermal barrier coating according to claim 5, wherein the horizontal angle between the laser and the sample is set to be 45 ° to 60 °.
7. The method for improving the oxidation resistance of the metallic bonding layer of the thermal barrier coating according to claim 1, wherein in S2, the laser frequency is 100-200K, the scanning speed is 5-15mm/S, the laser is scanned three times, and the normal direction of the surface of the sample is taken as an axis, and the laser is rotated 120 degrees along the axis each time.
8. The method for improving the oxidation resistance of the metallic bonding layer of the thermal barrier coating according to claim 1, wherein in S2, argon atmosphere protection is performed during laser scanning treatment.
9. The method for improving the oxidation resistance of the metallic bond layer of the thermal barrier coating as claimed in claim 1, wherein in S2, the remelting depth is 1 to 3 μm.
10. The method for improving the oxidation resistance of the metallic bond layer of the thermal barrier coating as claimed in claim 1, wherein the thickness of the ceramic thermal insulation layer prepared in S2 is 100-350 μm.
CN202211350147.4A 2022-10-31 2022-10-31 Method for improving oxidation resistance of metal bonding layer of thermal barrier coating Pending CN115627438A (en)

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