CN112981330A - Modified NiCrAlYSi bonding layer and preparation method and application thereof - Google Patents

Modified NiCrAlYSi bonding layer and preparation method and application thereof Download PDF

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CN112981330A
CN112981330A CN202110154254.9A CN202110154254A CN112981330A CN 112981330 A CN112981330 A CN 112981330A CN 202110154254 A CN202110154254 A CN 202110154254A CN 112981330 A CN112981330 A CN 112981330A
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nicralysi
layer
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bonding layer
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CN112981330B (en
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张恒
康杰
刘原
宫声凯
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Beihang University Sichuan International Center For Innovation In Western China Co ltd
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Beihang University Sichuan International Center For Innovation In Western China Co ltd
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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
    • C23C14/00—Coating by vacuum evaporation, by sputtering or by ion implantation of the coating forming material
    • C23C14/22—Coating by vacuum evaporation, by sputtering or by ion implantation of the coating forming material characterised by the process of coating
    • C23C14/24—Vacuum evaporation
    • C23C14/32—Vacuum evaporation by explosion; by evaporation and subsequent ionisation of the vapours, e.g. ion-plating
    • C23C14/325—Electric arc evaporation
    • 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
    • C23C14/00—Coating by vacuum evaporation, by sputtering or by ion implantation of the coating forming material
    • C23C14/06—Coating by vacuum evaporation, by sputtering or by ion implantation of the coating forming material characterised by the coating material
    • C23C14/14—Metallic material, boron or silicon
    • C23C14/16—Metallic material, boron or silicon on metallic substrates or on substrates of boron or silicon
    • 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
    • C23C14/00—Coating by vacuum evaporation, by sputtering or by ion implantation of the coating forming material
    • C23C14/58—After-treatment
    • C23C14/5846—Reactive treatment

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Abstract

The invention provides a modified NiCrAlYSi bonding layer and a preparation method and application thereof, belonging to the technical field of thermal barrier coatings. Firstly, preparing a NiCrAlYSi layer on a nickel-based high-temperature alloy substrate by utilizing multi-arc ion plating, then aluminizing the NiCrAlYSi layer by utilizing a chemical vapor deposition method, forming a double-layer structure modified NiCrAlYSi bonding layer with an NiAl layer as the outermost layer and a NiCrAlYSi layer as the inner layer due to mutual diffusion of elements when the chemical vapor aluminizing is carried out at 1050 ℃, and forming a flat and compact oxide film outside the coating when the coating is circularly oxidized at 1200 ℃ due to the addition of Cr, Y and Si elements in the oxidation process after the modified NiCrAlYSi bonding layer is used for a thermal barrier coating; when the aluminum element in the oxide film is consumed, the internal aluminum element can be continuously supplemented outwards, so that the Al content in the coating can be increased, and the phenomenon of the mechanical property deterioration of the coating can be weakened.

Description

Modified NiCrAlYSi bonding layer and preparation method and application thereof
Technical Field
The invention relates to the technical field of thermal barrier coatings, in particular to a modified NiCrAlYSi bonding layer and a preparation method and application thereof.
Background
The nickel-based single crystal superalloy blade is widely applied to gas turbines and aero-engines, and the thermal barrier coating has excellent heat insulation, high temperature resistance, oxidation corrosion resistance, abrasion resistance and other properties, so that the thermal barrier coating plays a role in heat insulation protection on the surface of the nickel-based single crystal superalloy blade. The typical structure of the thermal barrier coating of the turbine blade in practical application adopts a double-layer structure, namely a ceramic layer and a metal bonding layer. The bonding layer is used for relieving the thermal mismatch between the ceramic layer and the alloy substrate and improving the high-temperature oxidation corrosion resistance of the substrate. The advanced single crystal high temperature alloy of the new generation of aeroengine has urgent requirements on the thermal barrier coating with ultrahigh temperature and long service life, so that the research on novel thermal barrier coating materials to improve the service life of the thermal barrier coating is particularly important.
Al is formed between the ceramic layer and the metal bonding layer in the service process of the engine2O3Oxide layer, Al due to bonding layer composition2O3Factors such as growth speed, composition, integrity and bonding force with a substrate of the oxide layer have a determining function, and the factors directly influence the service life of the thermal barrier coating, so that optimization and selection of the bonding layer composition are very critical to prolonging the service life of the thermal barrier coating.
The life and performance of MCrAlY coatings are greatly influenced by the amount of Al content in the coating, and the MCrAlY coatings are mainly based on Al formed on the surface2O3To resist high-temperature oxidation and high-temperature hot corrosion, and the long-term service can cause the oxide film to crack and fall off. The Al element is consumed in a large amount due to the formation, exfoliation, regeneration of an oxide film, and interdiffusion of elements with the substrate. Therefore, increasing the content of a1 in the MCrAlY coating is an effective way to extend its service life. However, directly increasing the Al content causes the MCrAlY coating itself to become more brittle and to deteriorate the mechanical properties.
Disclosure of Invention
The invention aims to provide a modified NiCrAlYSi bonding layer, and a preparation method and application thereof.
In order to achieve the above object, the present invention provides the following technical solutions:
the invention provides a preparation method of a modified NiCrAlYSi bonding layer, which comprises the following steps:
providing a pretreated nickel-base superalloy substrate;
taking NiCrAlYSi alloy as a target material, and performing multi-arc ion plating on the surface of the pretreated nickel-based high-temperature alloy substrate to form a NiCrAlYSi layer;
performing chemical vapor phase aluminizing on the surface of the NiCrAlYSi layer to form a NiAl layer to obtain a modified NiCrAlYSi bonding layer; the temperature of the chemical vapor aluminizing is 1020-1060 ℃.
Preferably, the pretreatment comprises grinding, rounding, sand blasting, cleaning and drying which are carried out in sequence.
Preferably, the NiCrAlYSi alloy comprises the following elements in mass percent: 15-20% of Cr, 10-15% of Al, 0.2-1.0% of Y, 0.6-1.2% of Si and the balance of Ni.
Preferably, the arc current of the multi-arc ion plating is 160-200A, the bias voltage is 10-30V, and the background vacuum degree is 1 multiplied by 10-3～9×10-3Pa。
Preferably, the temperature of the pretreated nickel-based superalloy substrate is 300-500 ℃ during the multi-arc ion plating.
Preferably, the vacuum degree of the chemical vapor aluminizing is (1-9) multiplied by 10-3Pa, and the aluminizing time is 2-5 h.
The invention provides a modified NiCrAlYSi bonding layer prepared by the preparation method in the technical scheme, and the modified NiCrAlYSi bonding layer comprises a NiCrAlYSi layer and a NiAl layer which is laminated on the surface of the NiCrAlYSi layer.
Preferably, the thickness of the NiAl layer is 15-20 μm, the content of Al in the NiAl layer is 40-60 at%, and the balance is Ni.
Preferably, the thickness of the NiCrAlYSi layer is 20-60 mu m; in the NiCrAlYSi layer, the content of Cr is 20-25 at%, the content of Al is 25-30 at%, the content of Y is 0.2-1.0 at%, the content of Si is 0.5-1.0 at%, and the balance is Ni.
The invention provides application of the modified NiCrAlYSi bonding layer in a thermal barrier coating.
The invention provides a preparation method of a modified NiCrAlYSi bonding layer, which comprises the following steps: providing a pretreated nickel-base superalloy substrate; taking NiCrAlYSi alloy as a target material, and performing multi-arc ion plating on the surface of the pretreated nickel-based high-temperature alloy substrate to form a NiCrAlYSi layer; performing chemical vapor phase aluminizing on the surface of the NiCrAlYSi layer to form a NiAl layer to obtain a modified NiCrAlYSi bonding layer; the temperature of the chemical vapor aluminizing is 1020-1060 ℃. Firstly, preparing a NiCrAlYSi layer on a nickel-based high-temperature alloy substrate by utilizing multi-arc ion plating, then aluminizing the NiCrAlYSi layer by utilizing a chemical vapor deposition method, forming a double-layer structure modified NiCrAlYSi bonding layer with an NiAl layer as the outermost layer and a NiCrAlYSi layer as the inner layer due to mutual diffusion of elements when the chemical vapor aluminizing is carried out at 1050 ℃, and forming a flat and compact oxide film outside the coating when the coating is circularly oxidized at 1200 ℃ due to the addition of Cr, Y and Si elements in the oxidation process after the modified NiCrAlYSi bonding layer is used for a thermal barrier coating; when the aluminum element in the oxide film is consumed, the internal aluminum element can be continuously supplemented outwards, so that the Al content in the coating can be increased, and the phenomenon of the mechanical property deterioration of the coating can be weakened.
The results of the examples show that the modified NiCrAlYSi bonding layer prepared by the invention has no flaking phenomenon on the coating surface and the oxidation weight gain is lower than 0.467mg/cm after being subjected to cyclic oxidation at 1200 ℃ for 100 hours2The modified NiCrAlYSi bonding layer prepared by the invention can achieve complete oxidation resistance in air at 1200 ℃ and has excellent oxidation resistance.
The preparation method is simple and feasible, the high-temperature oxidation resistance of the prepared modified NiCrAlYSi bonding layer is far higher than that of a common NiCrAlY coating, and the service life of the coating is obviously prolonged in the environment of 1200 ℃.
Drawings
FIG. 1 is a schematic cross-sectional view of a modified NiCrAlYSi bond coat made in example 1;
FIG. 2 is a as-deposited cross-sectional profile of a modified NiCrAlYSi bond coat made in accordance with example 1;
FIG. 3 is a graph of the as-deposited cross-sectional elemental distribution of a modified NiCrAlYSi bond coat prepared in example 1;
FIG. 4 is a graph of the weight gain of a 100 hour cyclic oxidation sample of a modified NiCrAlYSi bondcoat made according to example 1;
FIG. 5 is a surface topography of the modified NiCrAlYSi bonding layer prepared in example 1 after 100h cyclic oxidation at 1200 ℃ in an atmospheric environment.
FIG. 6 is a surface topography diagram of the NiCrAlY bonding layer prepared in comparative example 1 after cyclic oxidation at 1200 ℃ for 10h in an atmospheric environment.
Detailed Description
The invention provides a preparation method of a modified NiCrAlYSi bonding layer, which comprises the following steps:
providing a pretreated nickel-base superalloy substrate;
taking NiCrAlYSi alloy as a target material, and performing multi-arc ion plating on the surface of the pretreated nickel-based high-temperature alloy substrate to form a NiCrAlYSi layer;
performing chemical vapor phase aluminizing on the surface of the NiCrAlYSi layer to form a NiAl layer to obtain a modified NiCrAlYSi bonding layer; the temperature of the chemical vapor aluminizing is 1020-1060 ℃.
In the present invention, unless otherwise specified, all the necessary production equipment or starting materials are commercially available products well known to those skilled in the art.
The invention provides a pretreated nickel-base superalloy substrate. The source and specific composition of the nickel-base superalloy substrate are not particularly limited in the present invention, and any commercially available nickel-base superalloy substrate known in the art may be used; in an embodiment of the invention, the nickel-based superalloy substrate is specifically an IC21 superalloy, and the IC21 superalloy comprises the following components in percentage by mass: 8-9% of Al, 12-14% of Mo, 1-3% of Re, 2-3% of Ta, 1-3% of Cr and the balance of Ni.
In the invention, the pretreatment preferably comprises the steps of grinding, rounding, sand blasting, cleaning and drying which are sequentially carried out, and in the invention, the steps of grinding, rounding, sand blasting, cleaning and drying are preferably carried out on each surface of the nickel-base superalloy substrate sequentially. In the present invention, the polishing process preferably uses 200#, 600#, 800# water abrasive paper to polish each surface of the substrate. The invention preferably performs the polishing until the roughness Ra of each surface of the substrate is less than 0.8; the mesh number of the fine sand for blasting is preferably 20 meshes, and the pressure of the blasting is preferably 0.2 MPa. The process of rounding, washing and drying is not particularly limited in the present invention and may be performed according to a process well known in the art. In the embodiment of the present invention, the cleaning is preferably performed by sequentially performing ultrasonic cleaning with absolute ethanol and acetone for 15 min.
In the embodiment of the present invention, before the pretreatment, the nickel-based superalloy substrate is preferably cut into a size of 10 × 8 × 3mm by wire cutting3A hole having a diameter of 1mm was cut at each end of the sample to facilitate the suspension of the sample on a holder during the preparation of the coating.
After the pretreated nickel-based high-temperature alloy matrix is obtained, the invention takes the NiCrAlYSi alloy as the target material, and carries out multi-arc ion plating on the surface of the pretreated nickel-based high-temperature alloy matrix to form a NiCrAlYSi layer.
In the present invention, the NiCrAlYSi alloy preferably comprises the following elements in mass percent: 15-20% of Cr, 10-15% of Al, 0.2-1.0% of Y, 0.6-1.2% of Si and the balance of Ni; the content of Cr is more preferably 16-19%, and further preferably 17-18%; the content of the Al is more preferably 11-14%, and further preferably 12-13%; the content of Y is more preferably 0.3-0.8%, and even more preferably 0.5-0.6%; the content of Si is more preferably 0.8 to 1.0%, and still more preferably 0.85 to 0.95%. In the present invention, the NiCrAlYSi alloy preferably comprises the following elements: the source of the NiCrAlYSi alloy is not particularly limited in the present invention and can be obtained in a manner well known in the art.
The equipment and the specific process for the multi-arc ion plating are not particularly limited in the invention, and the equipment and the process for the multi-arc ion plating are well known in the field. In the invention, the arc current of the multi-arc ion plating is preferably 160-200A, and more preferably 170 to 190A, more preferably 175 to 185A; the bias voltage is preferably 10-30V, more preferably 15-25V; the background vacuum degree is preferably 1X 10-3～9×10-3Pa, more preferably 3X 10-3～8×10-3Pa, more preferably 5X 10-3～6×10-3Pa。
In the invention, when the multi-arc ion plating is carried out, the temperature of the pretreated nickel-based superalloy substrate is preferably 300-500 ℃, and more preferably 350-450 ℃.
During the multi-arc ion plating process, the metal on the NiCrAlYSi alloy evaporates, forming a layer of NiCrAlYSi.
After the NiCrAlYSi layer is formed, the chemical vapor phase aluminizing is carried out on the surface of the NiCrAlYSi layer to form a NiAl layer, so that the modified NiCrAlYSi bonding layer is obtained. The equipment and the specific process for the chemical vapor aluminizing are not particularly limited, and the equipment and the process for the chemical vapor aluminizing are well known in the field.
In the invention, the temperature of the chemical vapor aluminizing is 1020-1060 ℃, and 1050 ℃ is preferred; the preferred vacuum degree of the chemical vapor aluminizing is (1-9) multiplied by 10-3Pa, more preferably 5X 10-3Pa, the aluminizing time is preferably 2-5 h, and more preferably 3-4 h. In the chemical vapor aluminizing process, elements in the NiCrAlYSi layer and Al elements are diffused mutually to form a double-layer structure, the outermost layer forms a NiAl layer, and the inner layer is still a NiCrAlYSi layer, so that the modified NiCrAlYSi bonding layer is obtained.
The invention provides a modified NiCrAlYSi bonding layer prepared by the preparation method in the technical scheme, and the modified NiCrAlYSi bonding layer comprises a NiCrAlYSi layer and a NiAl layer which is laminated on the surface of the NiCrAlYSi layer.
The prepared modified NiCrAlYSi bonding layer comprises a NiCrAlYSi layer, wherein the thickness of the NiCrAlYSi layer is preferably 20-60 mu m, and more preferably 30-50 mu m.
In the NiCrAlYSi layer, the content of Cr is preferably 20-25 at%, and more preferably 22-24 at%; the content of Al is preferably 25 to 30 at%, more preferably 26 to 28 at%; the content of Y is preferably 0.2 to 1.0 at%, more preferably 0.5 to 0.8 at%; the Si content is preferably 0.5 to 1.0 at%, more preferably 0.6 to 0.8 at%, and the balance Ni.
The prepared modified NiCrAlYSi bonding layer comprises a NiAl layer arranged on the surface of the NiCrAlYSi layer in a laminated mode, and the thickness of the NiAl layer is preferably 15-20 micrometers, and more preferably 16-18 micrometers.
In the invention, the NiAl layer preferably contains 40 to 60 at%, more preferably 45 to 50 at%, and the balance of Ni.
The invention provides application of the modified NiCrAlYSi bonding layer in a thermal barrier coating. The method for applying the modified NiCrAlYSi bonding layer to the thermal barrier coating is not particularly limited, and the modified NiCrAlYSi bonding layer can be used as the bonding layer of the thermal barrier coating according to the process well known in the art.
The technical solution of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. It is to be understood that the described embodiments are merely exemplary of the invention, and not restrictive of the full scope of the invention. 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.
Example 1
The NiCrAlYSi alloy used in this example includes the following elements in mass percent: 19.3% of Cr, 12.12% of Al, 0.41% of Y, 0.85% of Si and the balance of Ni;
using commercial IC21 nickel-based single crystal superalloy as a base material, cutting the base alloy into pieces with the specification of 10 × 8 × 3mm by a wire cutting method3Cutting a hole with the diameter of 1mm at the two ends of the sample respectively so as to be convenient for hanging the sample on a bracket when preparing the coating; sequentially grinding six surfaces of the cut matrix sample by using No. 200, No. 600 and No. 800 water grinding sandpaper until the surface roughness Ra of the matrix is<0.8, then, all 12 edges are chamfered into round corners, the obtained sample is subjected to sand blasting (the mesh number of the used fine sand is 20 meshes, the pressure is 0.2MPa), the obtained matrix sample is sequentially subjected to ultrasonic cleaning for 15min by using absolute ethyl alcohol and acetone, and drying is carried out, so as to obtain the pretreated nickelA base superalloy substrate;
taking the NiCrAlYSi alloy as a target material, and carrying out multi-arc ion plating on the surface of the pretreated nickel-based high-temperature alloy substrate, wherein the arc current of the multi-arc ion plating is 180A, the bias voltage is 30V, and the background vacuum degree is 2 multiplied by 10-3Pa; the temperature of the pretreated nickel-based superalloy substrate is 400 ℃, and a NiCrAlYSi layer is formed;
performing chemical vapor infiltration on the surface of the NiCrAlYSi layer, wherein the vacuum degree of the chemical vapor infiltration method is 5 multiplied by 10- 3Pa, the aluminizing temperature is 1050 ℃, and the aluminizing time is 2 hours, so that a NiAl layer is formed, and a modified NiCrAlYSi bonding layer is obtained; in the modified NiCrAlYSi bonding layer, the content of Al in the NiAl layer is 46.34 at%, and the balance is Ni; the thickness of the NiAl layer is 20 mu m; in the NiCrAlYSi layer, the content of Cr is 23.38 at%, and the content of Al is 28.9 at%; the content of Y is 0.39 at%; si content of 0.88 at%, and the balance Ni; the thickness of the NiCrAlYSi layer is 25 μm.
Example 2
The NiCrAlYSi alloy used in this example includes the following elements in mass percent: 19.3% of Cr, 12.12% of Al, 0.41% of Y, 0.85% of Si and the balance of Ni;
a commercially available IC21 nickel-based single crystal superalloy (having the same composition as in example 1) was used as a base material, and the base alloy was cut into pieces having a size of 10X 8X 3mm by wire cutting3Cutting a hole with the diameter of 1mm at the two ends of the sample respectively so as to be convenient for hanging the sample on a bracket when preparing the coating; sequentially grinding six surfaces of the cut matrix sample by using No. 200, No. 600 and No. 800 water grinding sandpaper until the surface roughness Ra of the matrix is<0.8, then, chamfering all 12 edges into a fillet, carrying out sand blasting on the obtained sample (the mesh number of the used fine sand is 20 meshes, the pressure is 0.2MPa), carrying out ultrasonic cleaning on the obtained substrate sample for 15min by using absolute ethyl alcohol and acetone in sequence, and drying to obtain a pretreated nickel-based high-temperature alloy substrate;
taking the NiCrAlYSi alloy as a target material, performing multi-arc ion plating on the surface of the pretreated nickel-based high-temperature alloy substrate, wherein the arc current of the multi-arc ion plating is 170A, the bias voltage is 15V, and the background vacuum degree is 2 multiplied by 10-3Pa; the pretreatmentThe temperature of the nickel-based superalloy substrate is 350 ℃, and a NiCrAlYSi layer is formed;
performing chemical vapor infiltration on the surface of the NiCrAlYSi layer, wherein the vacuum degree of the chemical vapor infiltration method is 5 multiplied by 10- 3Pa, the aluminizing temperature is 1050 ℃, and the aluminizing time is 3 hours, so that a NiAl layer is formed, and a modified NiCrAlYSi bonding layer is obtained; in the modified NiCrAlYSi bonding layer, the content of Al in the NiAl layer is 45.45 at%, and the balance is Ni; the thickness of the NiAl layer is 20 mu m; in the NiCrAlYSi layer, the content of Cr is 22.38at percent, and the content of Al is 29.1at percent; the content of Y is 0.32 at%; si content of 1.0 at%, and the balance Ni; the thickness of the NiCrAlYSi layer is 25 μm.
Example 3
The NiCrAlYSi alloy used in this example includes the following elements in mass percent: 19.3% of Cr, 12.12% of Al, 0.41% of Y, 0.85% of Si and the balance of Ni;
a commercially available IC21 nickel-based single crystal superalloy (having the same composition as in example 1) was used as a base material, and the base alloy was cut into pieces having a size of 10X 8X 3mm by wire cutting3Cutting a hole with the diameter of 1mm at the two ends of the sample respectively so as to be convenient for hanging the sample on a bracket when preparing the coating; sequentially grinding six surfaces of the cut matrix sample by using No. 200, No. 600 and No. 800 water grinding sandpaper until the surface roughness Ra of the matrix is<0.8, then, chamfering all 12 edges into a fillet, carrying out sand blasting on the obtained sample (the mesh number of the used fine sand is 20 meshes, the pressure is 0.2MPa), carrying out ultrasonic cleaning on the obtained substrate sample for 15min by using absolute ethyl alcohol and acetone in sequence, and drying to obtain a pretreated nickel-based high-temperature alloy substrate;
taking the NiCrAlYSi alloy as a target material, performing multi-arc ion plating on the surface of the pretreated nickel-based high-temperature alloy substrate, wherein the arc current of the multi-arc ion plating is 175A, the bias voltage is 30V, and the background vacuum degree is 2 multiplied by 10-3Pa; the temperature of the pretreated nickel-based superalloy substrate is 450 ℃, and a NiCrAlYSi layer is formed;
performing chemical vapor infiltration on the surface of the NiCrAlYSi layer, wherein the vacuum degree of the chemical vapor infiltration method is 5 multiplied by 10- 3Pa, aluminizing temperature 1020 ℃, aluminizing time 4h, formingThe NiAl layer is used for obtaining a modified NiCrAlYSi bonding layer, wherein in the modified NiCrAlYSi bonding layer, the content of Al is 49.73 at%, and the balance is Ni; the thickness of the NiAl layer is 20 mu m; in the NiCrAlYSi layer, the content of Cr is 20.3 at%, and the content of Al is 28.44 at%; the Y content is 0.37 at%; si content of 0.8 at%, and the balance Ni; the thickness of the NiCrAlYSi layer is 25 μm.
Comparative example 1
Polishing an IC21 high-temperature alloy substrate by using 800-mesh sand paper, performing sand blasting by using a sand blasting machine (the mesh number of used fine sand is 20 meshes, and the pressure is 0.2MPa), then respectively cleaning for 30min by using alcohol and acetone, and drying to obtain the surface of a pretreated substrate;
taking NiCrAlY alloy (the alloy composition is Cr 16.5%, Al 12.5%, Y0.7% and the balance of Ni) as a target material, and carrying out multi-arc ion plating on the surface of the pretreated substrate, wherein the specific parameters of the multi-arc ion plating are as follows: arc current 180A; bias voltage is 30V; the temperature of the matrix is 400 ℃; background vacuum degree: 5X 10-3Pa; the rotation mode is revolution; the rotating speed of the workpiece is 1rpm, and the NiCrAlY bonding layer is obtained.
Characterization and Performance testing
1) The structural schematic diagram of the modified NiCrAlYSi bonding layer prepared in this example is shown in fig. 1, the modified NiCrAlYSi bonding layer is a bilayer structure, and the NiCrAlYSi layer is located between the NiAl layer and the substrate.
2) SEM testing of the sample prepared in example 1 resulted in the structure shown in fig. 2, and the modified NiCrAlYSi bond coat prepared as shown in fig. 2 had a distinct two-layer structure with the uppermost NiAl layer and the NiCrAlYSi layer as the intermediate layer.
3) FIG. 3 is a distribution diagram of the as-deposited cross-sectional elements of the modified NiCrAlYSi bond coat prepared in example 1. As can be seen from FIG. 3, the outermost layer farthest from the surface of the substrate is mainly composed of a NiAl layer, and the second outermost layer is mainly a NiCrAlYSi layer, and the Al content is distributed in a gradient manner from the outside to the inside.
4) Placing the sample prepared in example 1 in an atmospheric environment at 1200 ℃, performing an oxidation experiment by adopting an isothermal oxidation weight increasing method, setting the experiment temperature at 1200 ℃, setting the total time of the experiment at 100h, taking out the sample 10h before the oxidation experiment, air-cooling and weighing the sample every hour, and 1After 0h, samples were taken out at intervals of 10h and air-cooled and weighed, and the weight gain curve was measured as shown in FIG. 4. As can be seen from FIG. 4, the sample prepared in example 1 had an oxidative weight gain of less than 0.467mg/cm2And the complete oxidation resistance level is achieved.
5) Fig. 5 is a real image of the coating obtained after cyclic oxidation at 1200 ℃ in the atmospheric environment for 100 hours in step 3), and as can be seen from fig. 5, the oxide film generated on the surface of the bonding layer is flat, no peeling occurs on the surface, and the complete oxidation resistance level is achieved.
6) FIG. 6 is a diagram of a NiCrAlY bonding layer prepared in comparative example 1, which is subjected to cyclic oxidation at 1200 ℃ for 10 hours in an atmospheric environment, and it can be seen from FIG. 6 that an oxidized scale falls off from the surface of the NiCrAlY bonding layer prepared in comparative example 1, and oxidation resistance cannot be achieved.
7) The cycle oxidation experiment is carried out on the modified NiCrAlYSi bonding layer prepared in the embodiment 2-3, and the experimental result is similar to that of the embodiment 1.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.

Claims (10)

1. A preparation method of a modified NiCrAlYSi bonding layer is characterized by comprising the following steps:
providing a pretreated nickel-base superalloy substrate;
taking NiCrAlYSi alloy as a target material, and performing multi-arc ion plating on the surface of the pretreated nickel-based high-temperature alloy substrate to form a NiCrAlYSi layer;
performing chemical vapor phase aluminizing on the surface of the NiCrAlYSi layer to form a NiAl layer to obtain a modified NiCrAlYSi bonding layer; the temperature of the chemical vapor aluminizing is 1020-1060 ℃.
2. The method of claim 1, wherein the pre-treatment comprises grinding, rounding, blasting, cleaning, and drying, which are performed sequentially.
3. The method of claim 1, wherein the NiCrAlYSi alloy comprises, in mass percent: 15-20% of Cr, 10-15% of Al, 0.2-1.0% of Y, 0.6-1.2% of Si and the balance of Ni.
4. The method according to claim 1, wherein the arc current of the multi-arc ion plating is 160-200A, the bias voltage is 10-30V, and the background vacuum degree is 1 x 10-3～9×10-3Pa。
5. The method according to claim 1 or 4, wherein the temperature of the pretreated nickel-base superalloy substrate is 300 to 500 ℃ when the multi-arc ion plating is performed.
6. The method according to claim 1, wherein the degree of vacuum of the chemical vapor aluminizing is (1 to 9) x 10-3Pa, and the aluminizing time is 2-5 h.
7. The modified NiCrAlYSi bonding layer prepared by the preparation method of any one of claims 1 to 6, which is characterized by comprising a NiCrAlYSi layer and a NiAl layer laminated on the surface of the NiCrAlYSi layer.
8. The modified NiCrAlYSi bonding layer of claim 7, wherein the thickness of the NiAl layer is 15-20 μm, the content of Al in the NiAl layer is 40-60 at%, and the balance is Ni.
9. The method of claim 7, wherein the NiCrAlYSi layer has a thickness of 20 to 60 μm; in the NiCrAlYSi layer, the content of Cr is 20-25 at%, the content of Al is 25-30 at%, the content of Y is 0.2-1.0 at%, the content of Si is 0.5-1.0 at%, and the balance is Ni.
10. Use of a modified NiCrAlYSi bond coat according to any of the claims 7 to 9 in thermal barrier coatings.
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