CN115110024A - MCrAlY coating containing active element modification Re-based diffusion barrier and preparation method thereof - Google Patents
MCrAlY coating containing active element modification Re-based diffusion barrier and preparation method thereof Download PDFInfo
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- 238000000576 coating method Methods 0.000 title claims abstract description 105
- 238000009792 diffusion process Methods 0.000 title claims abstract description 66
- 230000004888 barrier function Effects 0.000 title claims abstract description 53
- 230000004048 modification Effects 0.000 title claims abstract description 17
- 238000012986 modification Methods 0.000 title claims abstract description 17
- 238000002360 preparation method Methods 0.000 title claims abstract description 9
- 239000000758 substrate Substances 0.000 claims abstract description 35
- 238000000034 method Methods 0.000 claims abstract description 27
- 238000009713 electroplating Methods 0.000 claims abstract description 16
- 238000000137 annealing Methods 0.000 claims abstract description 12
- 229910045601 alloy Inorganic materials 0.000 claims abstract description 11
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- 238000007733 ion plating Methods 0.000 claims abstract description 11
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- PXHVJJICTQNCMI-UHFFFAOYSA-N nickel Substances [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 claims description 35
- 238000000151 deposition Methods 0.000 claims description 14
- 238000010438 heat treatment Methods 0.000 claims description 12
- 238000007747 plating Methods 0.000 claims description 12
- 230000008021 deposition Effects 0.000 claims description 10
- KRKNYBCHXYNGOX-UHFFFAOYSA-N citric acid Chemical compound OC(=O)CC(O)(C(O)=O)CC(O)=O KRKNYBCHXYNGOX-UHFFFAOYSA-N 0.000 claims description 9
- 238000000227 grinding Methods 0.000 claims description 9
- 230000004913 activation Effects 0.000 claims description 8
- 239000008367 deionised water Substances 0.000 claims description 7
- 229910021641 deionized water Inorganic materials 0.000 claims description 7
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 7
- CSCPPACGZOOCGX-UHFFFAOYSA-N Acetone Chemical compound CC(C)=O CSCPPACGZOOCGX-UHFFFAOYSA-N 0.000 claims description 6
- 239000002184 metal Substances 0.000 claims description 6
- 229910052751 metal Inorganic materials 0.000 claims description 6
- 229910052759 nickel Inorganic materials 0.000 claims description 6
- 229910000601 superalloy Inorganic materials 0.000 claims description 5
- 238000004381 surface treatment Methods 0.000 claims description 5
- 238000004321 preservation Methods 0.000 claims description 4
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- VHUUQVKOLVNVRT-UHFFFAOYSA-N Ammonium hydroxide Chemical compound [NH4+].[OH-] VHUUQVKOLVNVRT-UHFFFAOYSA-N 0.000 claims description 3
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- 244000137852 Petrea volubilis Species 0.000 claims description 2
- 239000010405 anode material Substances 0.000 claims description 2
- 229910052804 chromium Inorganic materials 0.000 claims description 2
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- 238000005137 deposition process Methods 0.000 claims 1
- 230000003647 oxidation Effects 0.000 abstract description 10
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- 239000000919 ceramic Substances 0.000 description 3
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- WUAPFZMCVAUBPE-UHFFFAOYSA-N rhenium atom Chemical compound [Re] WUAPFZMCVAUBPE-UHFFFAOYSA-N 0.000 description 1
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- 229910052726 zirconium Inorganic materials 0.000 description 1
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Classifications
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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
- C23C14/02—Pretreatment of the material to be coated
- C23C14/024—Deposition of sublayers, e.g. to promote adhesion of the coating
- C23C14/025—Metallic sublayers
-
- 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
- C23C14/22—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
- C23C14/58—After-treatment
- C23C14/5806—Thermal treatment
-
- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
- C25D3/00—Electroplating: Baths therefor
- C25D3/02—Electroplating: Baths therefor from solutions
- C25D3/56—Electroplating: Baths therefor from solutions of alloys
-
- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
- C25D5/00—Electroplating characterised by the process; Pretreatment or after-treatment of workpieces
- C25D5/48—After-treatment of electroplated surfaces
- C25D5/50—After-treatment of electroplated surfaces by heat-treatment
Abstract
The invention discloses an MCrAlY coating containing an active element modification Re-based diffusion barrier and a preparation method thereof, belonging to the technical field of high-temperature protective coatings. An MCrAlY coating containing an active element modification Re-based diffusion barrier is prepared on a high-temperature alloy matrix by an electroplating technology, an arc ion plating technology and a vacuum diffusion annealing method. Compared to conventional diffusion barriers, the diffusion barrier serves a dual role: firstly, refractory elements in a substrate are prevented from diffusing into the coating, and mutual diffusion between the coating and the substrate is inhibited; secondly, in the high-temperature oxidation process, Re in the Re-based diffusion barrier can diffuse into the MCrAlY coating, so that the thermal expansion coefficient between the coating and the oxide film is reduced, the adhesion of the oxide film is improved, and the modification effect of active elements is achieved. Under the dual action of the Re-based diffusion barrier, the high-temperature oxidation resistance of the coating is improved.
Description
Technical Field
The invention relates to the field of high-temperature protective coatings, in particular to an MCrAlY coating containing an active element modification Re-based diffusion barrier and a preparation method thereof.
Background
The high-temperature alloy is generally used for turbine blades of aeroengines, and has good oxidation resistance in addition to specific excellent high-temperature mechanical properties under high-temperature service conditions. The coating deposited on the surface of the high-temperature alloy can effectively improve the high-temperature oxidation resistance of the high-temperature alloy, and simultaneously maintain the mechanical property of the high-temperature alloy.
The MCrAlY (M ═ Ni, Co or NiCo) coating has excellent high-temperature oxidation resistance and thermal corrosion resistance, and the components and the thickness of the MCrAlY coating can be accurately regulated and controlled to meet the requirements of different working conditions, so the MCrAlY coating is widely used in high-temperature alloys, however, the MCrAlY coating often has serious interdiffusion between the coating and a substrate to accelerate the degradation of the coating, thereby causing negative influence on the oxidation resistance of the coating. The problem of mutual diffusion of the coating and the substrate interface can be effectively solved by adding a diffusion barrier between the coating and the substrate.
Diffusion barriers are generally classified into metal type diffusion barriers and ceramic type diffusion barriers. The ceramic type diffusion barrier can effectively prevent interdiffusion, and then the ceramic layer is for example Al-O-N or Al 2 O 3 And the bonding force of the substrate coating interface can be damaged; the metal type diffusion barrier is metallurgically bonded with the substrate and the coating, so that the metal type diffusion barrier has good bonding force with the substrate and the coating. Rhenium (Re) has a high melting point and good stability at high temperatures and is therefore considered to be an ideal material for diffusion barriers.
For high temperature protective coated parts, the oxidation resistance is mainly dependent on the surface oxide film, Al 2 O 3 The film has good stability at high temperature, and a layer of continuous Al is generated on the surface of the hot end part at high temperature 2 O 3 The film can effectively prolong the service life of hot end parts, the oxide film of the common MCrAlY coating is easy to peel off when the common MCrAlY coating is in service at high temperature for a long time, and elements such as Hf, Zr, Re and the like are generally added into the MCrAlY coating, so that the MCrAlY coating can play a role in activatingThe modification of the element improves the adhesion of the oxide film. Therefore, the research of the MCrAlY coating containing the Re-based diffusion barrier with the active element modification effect and the preparation method thereof are significant by combining the dual functions of the Re in preventing the element diffusion barrier and the active element modification effect.
Disclosure of Invention
The invention aims to provide an MCrAlY coating containing an active element modified Re-based diffusion barrier and a preparation method thereof, wherein the uniform and continuous Re-based diffusion barrier is formed at the interface of the coating and a substrate, and the Re-based diffusion barrier can prevent the mutual diffusion of the substrate and the coating in the high-temperature service process.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows:
a method for preparing MCrAlY coating containing active element modification Re-based diffusion barrier, which comprises the steps of firstly plating a Re-Ni layer on a high-temperature alloy substrate; then depositing an MCrAlY coating on the surface of the Re-Ni layer by using an arc ion plating technology; then, carrying out vacuum heat treatment to diffuse the Re-Ni layer, the matrix and the MCrAlY coating and make the coating structure more uniform, thereby forming the MCrAlY coating of the Re-based diffusion barrier with excellent binding force on the matrix; the method specifically comprises the following steps:
(1) pretreatment before electroplating: the pretreatment before electroplating comprises electrochemical oil removal and activation treatment which are sequentially carried out, and an oxide layer on the surface of the substrate is removed through the pretreatment, so that the binding force of the Re-Ni layer and the substrate is improved;
(2) and (3) composite plating of a Re-Ni layer: the plating solution comprises the following components: citric acid 0.1-0.4mol/L, NiSO 4 ·6H 2 O is 0.1-0.5mol/L, KReO 4 0.005-0.025mol/L, and the balance of deionized water; adjusting pH of the plating solution to 8-10 with ammonia water, heating the prepared solution to 45-60 deg.C at 0.5-10A/dm 2 After electrifying, electroplating the high-temperature alloy matrix at the cathode, wherein the anode material is a nickel plate; the electroplating time is determined according to the thickness of a required plating layer and the current density, and the thickness of the Re-Ni plating layer is 1-5 mu m;
(3) depositing an MCrAlY coating on the Re-Ni coating by adopting an arc ion plating technology, wherein the deposition time is 3-6 h;
(4) after the MCrAlY coating is deposited by arc ion plating, the matrix containing the two layers of films is subjected to vacuum annealing treatment under the vacuum condition, and the MCrAlY coating containing the Re-based diffusion barrier with the active element modification effect can be obtained through the steps.
The substrate in the step (1) is Ni-based high-temperature alloy.
In the step (1), firstly, carrying out surface treatment on the substrate, and then carrying out pretreatment; the surface treatment process comprises the following steps: the method comprises the following steps of grinding a sample by using 150#, 240#, 400#, 600#, and 800# SiC sand paper on a pre-grinding machine in sequence, grinding out a fresh surface of metal, then carrying out wet sand blasting on the sample, and then carrying out ultrasonic treatment on the sample by using tap water, deionized water and acetone in sequence to remove residual oil stains and the like on the surface of the sample.
The electroplating in the step (2) adopts double anodes, the centers of two anode surfaces are respectively opposite to the centers of two cathode surfaces, the relative distance between a cathode and an anode is 30-60mm, and the area ratio of the anode to the cathode single surface is (2-5): 1.
The Re-Ni layer in step (2) is a pre-formed layer of diffusion barrier, and the thickness is preferably 1-5 μm.
In the step (3), during the deposition of the MCrAlY coating: the target base distance is 200-250 mm, the arc voltage is 20-25V, the arc current is 70-90A, the pulse bias is-150-300V, the duty ratio is 20-40%, the deposition temperature is 100-300 ℃, the deposition time is 3-6h, and the coating thickness is 30-60 mu m.
In the step (3), a MCrAlY target is adopted when the MCrAlY coating is deposited, and the chemical components of the target are as follows according to the weight percentage: 16 to 24 percent of Cr, 8 to 16 percent of Al, 0.1 to 1 percent of Y, 0.5 to 2 percent of Si and the balance of Ni.
And (4) carrying out vacuum heat treatment, namely vacuum diffusion annealing, on the MCrAlY coating deposited in the step (3), wherein the temperature is 900-1000 ℃ during the vacuum diffusion annealing, the heat preservation time is 3-5 h, the heating rate is less than or equal to 20 ℃/min, and the MCrAlY coating is cooled to the room temperature along with the furnace after the heat preservation is finished.
The invention has the following advantages:
1. the invention firstly plates a Re-Ni layer on a substrate, then deposits a MCrAlY coating with high Cr content by an arc ion plating technology and carries out vacuum heat treatment, and forms a uniform and continuous Re-based diffusion barrier at the interface of the coating and the substrate, wherein the diffusion barrier, the MCrAlY coating and the substrate are metallurgically bonded.
2. In the high-temperature service process, the Re-based diffusion barrier can prevent the mutual diffusion of the substrate and the coating, so that the degradation of the coating is slowed down, and the service life of the coating is prolonged.
3. Re in the Re-based diffusion barrier can be diffused into the MCrAlY coating in the high-temperature service process, so that the adhesion of the oxide film is improved, and the modification effect of active elements is achieved.
Drawings
FIG. 1 is a cross-sectional SEM topography of an annealed Re-based diffusion barrier containing MCrAlY coating.
FIG. 2 is a surface SEM topography of the annealed Re-based diffusion barrier containing MCrAlY coating.
FIG. 3 is an XRD diffraction pattern of an MCrAlY coating containing a Re-based diffusion barrier after annealing.
FIG. 4 is a sectional SEM appearance of the Re-based diffusion barrier-containing MCrAlY coating after being oxidized at the constant temperature of 1100 ℃ for 200 h.
Detailed Description
The present invention will be described in detail with reference to the following embodiments and accompanying drawings.
The invention firstly plates a Re-Ni layer on a substrate, then deposits a MCrAlY coating with high Cr content by an arc ion plating technology and carries out vacuum heat treatment, and forms a uniform and continuous Re-based diffusion barrier at the interface of the coating and the substrate, wherein the diffusion barrier, the MCrAlY coating and the substrate are metallurgically bonded. The diffusion of elements can be prevented during the high-temperature oxidation process. Because the solid solubility of Re in Cr is high, and the Cr content of the MCrAlY coating is high, Re in a diffusion barrier can be promoted to diffuse into the MCrAlY coating by taking Cr as a medium at high temperature in the high-temperature service process, and the modification effect of active elements is achieved.
Example 1:
in this example, an MCrAlY coating containing an active element modification Re-based diffusion barrier is prepared on a nickel-based superalloy substrate, and the nickel-based superalloy used has the following chemical components (by mass percent): cr: 16%, Co: 8.5%, Al: 3.5%, Ti: 3.2%, Mo: 1.8%, W: 2.5%, Nb: 0.6%, C: small amount, Ni: and (4) the balance. The sample size was 15X 10X 2mm and a hole of 1.5mm diameter was wire cut 1mm from the edge to facilitate suspension of the sample during electroplating and arc ion plating.
Carrying out surface treatment and pretreatment on the sample: the method comprises the steps of grinding a sample to 800# abrasive paper on a pre-grinding machine by using SiC abrasive paper, grinding a fresh surface of metal, then carrying out wet sand blasting on the sample by using a mixture of 200-mesh corundum sand and glass sand and 1-2atm, and then carrying out ultrasonic treatment on the sand blasting sample by sequentially selecting tap water, deionized water and acetone to remove residual oil stains and the like on the surface. And (3) pretreatment before electroplating, which comprises electrochemical degreasing and activation treatment to remove an oxide layer on the surface of the sample. The specific electrochemical degreasing process comprises the following steps: electrochemically removing oil in 5g/L sodium hydroxide solution, using substrate as cathode, stainless steel plate as anode, and current density of 5A/dm 2 The treatment time is 1 min. The activation solution used in the activation treatment is prepared by mixing concentrated hydrochloric acid and deionized water according to the volume ratio of 20:80, wherein the concentrated hydrochloric acid is analytically pure (the concentration of the concentrated hydrochloric acid is 37%); in the process of activation treatment, the activation solution is kept at room temperature, and the sample is placed into the activation solution to be soaked for 1 min.
Suspending the pretreated high-temperature alloy matrix as a cathode in a plating solution, and electroplating according to the following steps: the plating solution comprises the following components: citric acid 0.3mol/L, NiSO 4 ·6H 2 O0.2 mol/L, KReO40.01mol/L and the balance of deionized water, adjusting pH to 9 with ammonia water, electroplating temperature of 55 deg.C, and current density of 1A/dm 2 Electroplating for 30 minutes.
After the Re-Ni layer is electroplated, an MCrAlY coating is deposited by adopting electric arc ion plating equipment, and after a sample is loaded into a furnace, the MCrAlY coating can be deposited after being subjected to pre-sputtering bombardment cleaning. Vacuum pre-pumping to 7X 10 -3 Pa, introducing argon gas during bombardment and deposition, wherein the vacuum degree is 2.3 multiplied by 10 -1 Pa。
When the coating is deposited, the target base distance is 250mm, the arc voltage is 20V, the arc current is 90A, the pulse bias is-150V, the duty ratio is 30%, the deposition temperature is 200 ℃, and the deposition time is 4.5 h.
And putting the obtained coating sample into a quartz glass tube, vacuumizing, introducing argon for protection, heating to 900 ℃ in a muffle furnace, keeping the temperature for 4 hours at the heating rate of 10 ℃/min, and cooling to room temperature along with the furnace after the temperature is kept.
The cross-sectional morphology of the Re-based diffusion barrier-containing MCrAlY coating after annealing is shown in figure 1. As can be seen from fig. 1, a continuous, uniform, dense Re-based diffusion barrier was formed between the substrate and the MCrAlY coating after annealing, the thickness of the coating being about 40 μm.
The surface topography of the coating after diffusion annealing is shown in fig. 2, and it can be seen from fig. 1 that the surface of the deposited coating is relatively rough, and some particles with different sizes are distributed on the surface of the coating.
The XRD pattern after diffusion annealing is shown in FIG. 3, and it can be seen from FIG. 3 that after vacuum diffusion annealing, the Re-based diffusion barrier MCrAlY coating mainly consists of beta-NiAl, gamma'/gamma and alpha-Cr phases.
The cross-section SEM appearance of the Re-based diffusion barrier-containing MCrAlY coating after being oxidized at the constant temperature of 1100 ℃ for 200h is shown in figure 4, and as can be seen from figure 4, Re in the diffusion barrier is diffused into the coating after being oxidized at the temperature of 1100 ℃ for 200h, and the Re can reduce the thermal expansion coefficient between an oxide film and the coating, thereby playing a role in modifying active elements.
Compared with the conventional diffusion barrier, the diffusion barrier of the invention plays a dual role: firstly, refractory elements in a substrate are prevented from diffusing into the coating, and mutual diffusion between the coating and the substrate is inhibited; secondly, in the high-temperature oxidation process, Re in the Re-based diffusion barrier can diffuse into the MCrAlY coating, the thermal expansion coefficient between the coating and the oxide film is reduced, the adhesion of the oxide film is improved, and the modification effect of active elements is achieved. Under the dual action of the Re-based diffusion barrier, the high-temperature oxidation resistance of the coating is improved. The MCrAlY coating containing the Re-based diffusion barrier modified by the active elements and the preparation method thereof can be applied to the protection of the nickel-based superalloy.
Claims (10)
1. A preparation method of an MCrAlY coating containing active element modification Re-based diffusion barrier is characterized by comprising the following steps: firstly, electroplating a Re-Ni layer on a high-temperature alloy substrate; then depositing an MCrAlY coating on the surface of the Re-Ni layer by using an arc ion plating technology; and then carrying out vacuum heat treatment to diffuse the Re-Ni layer with the substrate and the MCrAlY coating and make the coating structure more uniform, thereby forming the MCrAlY coating with the Re-based diffusion barrier with excellent bonding force on the substrate.
2. The method of claim 1, wherein the coating comprises an active element-modified Re-based diffusion barrier, and wherein the method comprises: the method specifically comprises the following steps:
(1) pretreatment before electroplating: the pretreatment before electroplating comprises electrochemical degreasing and activation treatment which are sequentially carried out, and an oxide layer on the surface of the substrate is removed through the pretreatment so as to improve the binding force of the Re-Ni layer and the substrate;
(2) composite plating of a Re-Ni layer: the plating solution comprises the following components: citric acid 0.1-0.4mol/L, NiSO 4 ·6H 2 O is 0.1-0.5mol/L, KReO 4 0.005-0.025mol/L, and the balance of deionized water; adjusting pH of the plating solution to 8-10 with ammonia water, heating the prepared plating solution to 45-60 deg.C at 0.5-10A/dm 2 Electroplating the substrate positioned at the cathode after electrifying under the current density of the anode, wherein the anode material is a nickel plate;
(3) depositing an MCrAlY coating on the Re-Ni coating by adopting an arc ion plating technology, wherein the deposition time is 3-6 h;
(4) after the MCrAlY coating is deposited by arc ion plating, the matrix prepared with the Re-Ni layer and the MCrAlY coating is subjected to vacuum annealing treatment under the vacuum condition, and then the MCrAlY coating containing the Re-based diffusion barrier with the active element modification effect is obtained.
3. The method of claim 1, wherein the superalloy substrate is a Ni-based superalloy.
4. The method of preparing a coating according to claim 2, characterized in that: in the step (1), firstly, carrying out surface treatment on a substrate, and then carrying out pretreatment; the surface treatment process comprises the following steps: the method comprises the following steps of grinding a matrix by using SiC sand paper of 150#, 240#, 400#, 600#, and 800# on a pre-grinding machine in sequence, grinding out a fresh surface of metal, then carrying out wet sand blasting on a sample, and then carrying out ultrasonic treatment on the sample by using tap water, deionized water and acetone in sequence to remove residual oil stains and the like on the surface of the sample.
5. The method of preparing a coating according to claim 2, characterized in that: the electroplating in the step (2) adopts double anodes, the centers of two anode surfaces are respectively opposite to the centers of two cathode surfaces, the relative distance between a cathode and an anode is 30-60mm, and the area ratio of the anode to the cathode single surface is (2-5): 1.
6. The method of preparing a coating according to claim 2, characterized in that: the thickness of the Re-Ni layer in the step (2) is 1-5 μm.
7. The method of preparing a coating according to claim 2, characterized in that: in the step (3), during the deposition process of the MCrAlY coating: the target base distance is 200-250 mm, the arc voltage is 20-25V, the arc current is 70-90A, the pulse bias is-150-300V, the duty ratio is 20-40%, the deposition temperature is 100-300 ℃, the deposition time is 3-6h, and the coating thickness is 30-60 mu m.
8. The coating preparation method according to claim 2 or 7, characterized in that: in the step (3), a MCrAlY target is adopted when the MCrAlY coating is deposited, and the chemical components of the target are as follows according to the weight percentage: 16 to 24 percent of Cr, 8 to 16 percent of Al, 0.1 to 1 percent of Y, 0.5 to 2 percent of Si and the balance of Ni.
9. The method of preparing a coating according to claim 2, characterized in that: and (4) carrying out vacuum heat treatment, namely vacuum diffusion annealing, on the MCrAlY coating deposited in the step (3), wherein the temperature is 900-1000 ℃, the heat preservation time is 3-5 h, the heating rate is less than or equal to 20 ℃/min, and the MCrAlY coating is cooled to room temperature along with the furnace after the heat preservation is finished.
10. An MCrAlY coating containing an active element modified Re-based diffusion barrier prepared by the method of claim 1.
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6143141A (en) * | 1997-09-12 | 2000-11-07 | Southwest Research Institute | Method of forming a diffusion barrier for overlay coatings |
| CN101709470A (en) * | 2009-11-30 | 2010-05-19 | 中国科学院金属研究所 | Preparation method of composite coating containing diffusion barrier generated in situ |
| CN108998794A (en) * | 2018-08-21 | 2018-12-14 | 中国科学院金属研究所 | A kind of Re-Si is total to modified aluminide coating and preparation method thereof |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6143141A (en) * | 1997-09-12 | 2000-11-07 | Southwest Research Institute | Method of forming a diffusion barrier for overlay coatings |
| CN101709470A (en) * | 2009-11-30 | 2010-05-19 | 中国科学院金属研究所 | Preparation method of composite coating containing diffusion barrier generated in situ |
| CN108998794A (en) * | 2018-08-21 | 2018-12-14 | 中国科学院金属研究所 | A kind of Re-Si is total to modified aluminide coating and preparation method thereof |
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