CN109763089B - Treatment method for improving Al content and high-temperature service performance of MCrAlY protective coating surface - Google Patents
Treatment method for improving Al content and high-temperature service performance of MCrAlY protective coating surface Download PDFInfo
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Abstract
A processing method for improving the Al content and the high-temperature service performance of the surface of an MCrAlY protective coating is characterized in that a high-performance MCrAlY protective coating with an Al-rich surface layer is prepared by combining a combined process of laser impact, electron beam vapor deposition and atmospheric plasma spraying, a nanoscale Al film which is subjected to vacuum evaporation on the surface of the MCrAlY protective coating in advance is embedded into the surface of a coating strengthening layer through laser-induced ultrahigh-pressure impact force to form the Al-rich layer, and meanwhile, the laser impact effect is utilized to improve the surface density of the coating, realize grain refinement and residual stress adjustment. The Al on the surface of the protective coating prepared by the method is uniformly enriched, so that the rapid formation and the chemical stability of a protective oxide film can be effectively improved; in addition, the laser impact technology can also improve the surface density of the coating, refine crystal grains and adjust residual stress, thereby improving the high-temperature service life of the protective coating.
Description
Technical Field
The invention relates to a material technology, in particular to a method for improving the surface performance of a material by utilizing a laser shock technology, and specifically relates to a processing method for improving the Al content and the high-temperature service performance of the surface of an MCrAlY protective coating.
Background
MCrAlY (M = Co, Ni or Co + Ni and the like) high-temperature protective coating is a series of coating systems developed in recent years, has higher plasticity and excellent high-temperature oxidation resistance and heat corrosion resistance, can be selected according to different working conditions, can be used independently, can also be used as a metal bonding layer in a Thermal Barrier Coating (TBCs) system, and has been widely used in aviation and shipsThe hot-end parts of various gas engines, turbine engines, cannon barrels and the like for ground power generation, the heat corrosion resistance and the high-temperature oxidation resistance of the MCrAlY high-temperature protective coating are mainly determined by a protective oxide film α -Al formed on the surface of the coating2O3Early fast formation of continuous, dense α -Al2O3The film is a diffusion barrier layer, and when the film exists stably, the further oxidation failure of the coating can be effectively avoided. The formation of the oxide film is closely related to factors such as the micro-morphology, the grain size, the element distribution and the like of the MCrAlY coating. At present, the preparation method of the MCrAlY protective coating is mainly a plasma spraying technology. The prepared coatings by Low Pressure Plasma Spraying (LPPS) and Vacuum Plasma Spraying (VPS) have high compactness, can effectively avoid the oxidation of the coatings caused by high temperature sputtering, and have high temperature oxidation resistance. But the size of the workpiece is limited by the volume of the vacuum chamber and the spraying cost is expensive, thereby limiting the industrial popularization thereof. In contrast, the Atmospheric Plasma Spraying (APS) technology is the mainstream of the preparation and application of hot end components of engines in the fields of aviation, even ships, automobiles, energy sources and the like due to the advantages of simple operation, low cost, good heat insulation performance and the like. However, some spraying defects, such as rough surface, holes, micro-cracks, metal inclusions and the like, are inevitably introduced in the thermal spraying process, so that the oxide film is easy to be locally damaged in a high-temperature environment, which is very unfavorable for improving the high-temperature service performance.
At present, many researchers firstly aim to reduce the porosity of the MCrAlY protective coating sprayed by the atmospheric plasma and improve the compactness of the MCrAlY protective coating, and the most common method is to carry out shot blasting treatment on the surface of the alloy coating. The patent "a method and a device for preparing a coating by combining laser impact and thermal spraying" (patent No. CN 101760719B) "proposes a method for preparing a coating by combining laser impact and thermal spraying, namely, the surface of a metal coating is strengthened by using a shock wave effect to form a coating with low porosity, high bonding strength and compressive stress. Although the high-temperature oxidation resistance of the coating can be improved to a certain extent by reducing the surface roughness of the coating, the problems of uneven distribution of surface components of the coating, insufficient Al element and the like can not ensure the rapid formation of a continuous and compact protective oxide film, so the improvement degree is limited. From the viewpoint of coating composition, the higher the Al content of the MCrAlY protective coating, the better the high-temperature oxidation resistance, but the corresponding brittleness of the coating is also enhanced, and obviously, the Al content in the coating is inconsistent with the Al content on the surface. Korean Shi Yong et Al (Korean Shi Yong, Han Jian, etc., the microcosmic appearance and element distribution of a CoCrAlY deposited aluminum film under the action of a high-current pulse electron beam, academic journal of North and Hebei university, 2017 (41) 134-138.) provides a method for improving the surface microstructure and Al content of an atmospheric plasma spraying MCrAlY coating by using a technology of combining high-current pulse electron beam (HCPEB) and physical vapor deposition, and improves the high-temperature oxidation resistance of the coating to a certain extent. The HCPEB is mainly characterized in that a surface layer material is melted by electron beams with high energy density under a vacuum environment, and a strengthening layer is obtained by utilizing a self-quenching effect, but the melting point of the MCrAlY alloy is far higher than that of pure Al and even higher than that of pure Al, so that a large amount of Al element is consumed due to evaporation in the electron beam remelting process, the expected effect cannot be achieved, and the roughness of the surface of a coating after treatment is increased from 18.9 mu m to 42.1 mu m, which is unfavorable for the improvement of high-temperature oxidation resistance. In addition, the pulsed electron beam remelting technique requires a very high vacuum, which undoubtedly further limits the workpiece size, especially for workpieces with complex shapes and large structural dimensions.
Disclosure of Invention
The invention aims to provide a treatment method for improving the Al content and the high-temperature service performance of the surface of an MCrAlY (M = Co, Ni or Co + Ni and the like) protective coating, aiming at the problem that the porosity and the Al content of the existing MCrAlY high-temperature protective coating are difficult to balance. The method is characterized in that a nanoscale Al film which is pre-vacuum-evaporated on the surface of the MCrAlY protective coating is embedded into the surface of the coating under the action of high-pressure impact force, and the surface texture structure of the coating is adjusted through a laser shock wave effect, such as density improvement, grain refinement, surface roughness improvement, high-amplitude residual compressive stress generation and the like, so that an Al-rich surface strengthening layer is obtained.
The technical scheme of the invention is as follows:
a processing method for improving the Al content and the high-temperature service performance of the surface of an MCrAlY protective coating is characterized in that a high-performance MCrAlY protective coating with an Al-rich surface layer is prepared by combining a combined process of laser impact, electron beam vapor deposition and atmospheric plasma spraying, a nanoscale Al film which is subjected to vacuum evaporation on the surface of the MCrAlY protective coating in advance is embedded into the surface of a coating strengthening layer through laser-induced ultrahigh-pressure impact force to form the Al-rich layer, and meanwhile, the laser impact effect is utilized to improve the surface density of the coating, realize grain refinement and residual stress adjustment.
The method specifically comprises the following steps:
(1) depositing an MCrAlY protective coating on the surface of the high-temperature alloy substrate by adopting an atmospheric plasma spraying technology;
(2) depositing a nano-scale Al film on the surface of the MCrAlY protective coating by adopting an electron beam evaporation coating technology;
(3) arranging black paint or aluminum foil as an absorption layer and K9 glass or flowing water as a restraint layer on the MCrAlY protective coating deposited with the nano-scale Al film; carrying out laser shock treatment on the MCrAlY protective coating with the preset Al film by using a nanosecond laser, embedding Al nano-particles into the surface of the MCrAlY protective coating by using a laser shock wave effect to form an Al-rich surface strengthening layer, and regulating and controlling the surface microstructure and the stress state of the MCrAlY protective coating;
(4) and soaking the high-temperature alloy matrix subjected to laser shock treatment by using acetone to remove the residual constraint layer on the surface, thereby obtaining the MCrAlY strengthened coating with the Al-rich surface.
The MCrAlY protective coating in the step (1) is NiCrAlY, CoCrAlY, NiCoCrAlY or CoNiCrAlY.
The technical parameters of the atmospheric plasma spraying are as follows: the voltage is 30-50V, the current is 700-900A, the powder feeding rate is 2-10 r/min, the spraying speed is 300-500 mm/s, and the spraying distance is 70-100 mm.
The parameters of the electron beam evaporation coating in the step (2) are as follows: the filament voltage is 100-150V, the filament current is 0.5-1A, the beam current is 100-300 mA, the evaporation time is 20-100 min, and the thickness of the aluminum plating film is 200-1200 nm.
The laser shock peening technical parameters of the step (4) are as follows: the laser pulse energy is 2-10J, the spot diameter is 2-5 mm, and the lap joint rate is 30-80%.
The invention has the beneficial effects that:
the invention provides a processing method for improving the surface Al of the MCrAlY protective coating, starting from the preparation process, aiming at the problems of the existing method, namely, the combined process combining plasma spraying, electron beam evaporation coating and laser impact is adopted to prepare the high-performance MCrAlY protective coating, the combined process not only optimizes the microstructure of the surface of the plasma spraying coating, but also effectively improves the Al-rich strengthening phase on the surface of the coating on the basis of meeting the overall mechanical performance of the coating, and has very important significance for improving the high-temperature oxidation resistance of the coating.
The invention utilizes a combined process of plasma spraying, electron beam evaporation coating and laser impact to prepare the high-performance MCrAlY protective coating, namely, a layer of nanoscale Al film is obtained on the surface of the MCrAlY protective coating prepared by atmospheric plasma spraying by utilizing an electron beam evaporation coating technology, the Al content of the surface of the coating is improved, but the bonding strength of the film-substrate interface is relatively weak, and the coating is easy to peel off particularly under the action of thermal stress, the subsequent laser impact treatment is utilized, Al nanoparticles are completely embedded into the surface of the coating by utilizing the high-pressure laser impact wave effect to obtain an Al-rich strengthening layer, and meanwhile, the gaps and microcracks on the surface of the coating can be sealed and filled, the density of the coating is improved, the roughness of the surface of the coating is effectively reduced, the grains of the coating are refined, and residual pressure stress is preset in the coating, the formation of the Al-rich strengthening layer and the adjustment of the microstructure and the stress state can provide protection α -Al in the2O3The formation and steady-state growth of the oxide film provide good conditions, the growth stress of the oxide film is effectively adjusted, and the high-temperature service life of the coating is prolonged.
The Al on the surface of the protective coating prepared by the method is uniformly enriched, so that the rapid formation and the chemical stability of a protective oxide film can be effectively improved; in addition, the laser impact technology can also improve the surface density of the coating, refine crystal grains and adjust residual stress, thereby improving the high-temperature service life of the protective coating.
Drawings
FIG. 1 is a surface topography map of MCrAlY protective coating prepared by the atmospheric plasma spraying (a) and three combined processes (b) of the invention.
FIG. 2 is a distribution diagram of Al content on the surface of the MCrAlY protective coating prepared by three combined processes.
FIG. 3 is a sectional view of an oxide film of an MCrAlY coating prepared by the atmospheric plasma spraying (a) and the three combined processes (b) in the early oxidation stage.
Detailed Description
The invention is further described below with reference to the figures and examples.
The first embodiment.
As shown in fig. 1-3.
A treatment method for improving the Al content and the high-temperature service performance of the surface of a CoCrAlY protective coating comprises the following steps:
1) after the high-temperature alloy matrix is subjected to pre-grinding, cleaning and sand blasting roughening treatment, a CoCrAlY coating (Cr Wt.23%, Al Wt.13%, Y0.5 Wt%, Co Bal.) is deposited on the surface of the high-temperature alloy matrix by using an atmospheric plasma spraying technology, and the thickness of the CoCrAlY coating is 160 mu m; according to the technical requirements of atmospheric plasma spraying equipment, the voltage is 38V, the current is 750A, the powder feeding rate is controlled to be 6r/min, the speed of a spray gun is 450mm/s, and the spraying distance is 85 mm.
2) Selecting high-purity Al particles (the purity is 99.999%) with the diameter of 3mm as an electron beam vacuum coating material; according to the technical requirements of electron beam evaporation coating equipment, the filament voltage is 120V, the filament current is 0.7A, the beam current is 200mA, the evaporation time is 1h, and the thickness of an aluminum film is 600 nm.
3) Presetting an aluminum foil as an absorption layer on the surface of the CoCrAlY protective coating which is evaporated with the Al film, and adopting flowing water as a restraint layer;
4) a nanosecond pulse laser is used for carrying out laser shock treatment, the diameter of a light spot is 3mm, the pulse energy is 5J, the pulse width is 10ns, and the lap joint rate is 50%. The laser shock wave effect is utilized to enable the nanoscale Al film to be completely embedded into the surface layer of the CoCrAlY protective coating, and the Al-rich strengthening layer is prepared on the surface of the CoCrAlY protective coating.
Observing the surface morphology of the coating prepared by the atmospheric plasma spraying process and the three combined processes by adopting a JSM-IT300 type scanning electron microscope, wherein the surface of the coating prepared by the atmospheric plasma spraying process is loose and porous and is dispersed with a large amount of unmelted or semi-melted small particles as shown in figure 1; the MCrAlY coating obtained by three combined processes of atmospheric plasma spraying, electron beam evaporation coating and laser impact has a very compact surface and does not have obvious holes; in addition, according to the original component proportion, the Al content of the coating surface prepared by the atmospheric plasma spraying is less than 13% of the total content, but the Al content of the coating surface prepared by the three combined processes reaches 29% of the total content, and the Al content of the coating surface is greatly improved, as shown in FIG. 2. 1050oThe results of the high-temperature oxidation resistance experiments show that, as shown in fig. 3, in the initial stage of high-temperature oxidation (5h), a protective oxide film on the surface of the coating prepared by atmospheric plasma spraying is not formed, the oxide film mainly consists of mixed oxides, and the internal oxidation phenomenon even occurs in a local area; in contrast, the protective coating surface prepared by the three combined processes can quickly form a layer of continuous and compact Al with a thin thickness2O3Protective layer, early formed Al2O3The structure of the oxide film has important influence on the high-temperature oxidation resistance of the coating, thereby showing that the high-temperature oxidation resistance of the coating prepared by the three combined processes is obviously improved.
Example two.
A treatment method for improving the Al content and the high-temperature service performance of the surface of a NiCrAlY protective coating comprises the following steps:
1) after the high-temperature alloy matrix is subjected to pre-grinding, cleaning and sand blasting roughening treatment, an NiCrAlY coating (Cr Wt.23%, Al Wt.13%, Y0.5 Wt% and NiBal.) is deposited on the surface of the high-temperature alloy matrix by using an atmospheric plasma spraying technology, and the thickness of the high-temperature alloy matrix is 120 mu m; according to the technical requirements of the atmospheric plasma spraying equipment, the voltage is 45V, the current is 700A, the powder feeding rate is controlled to be 10r/min, the speed of a spray gun is 300mm/s, and the spraying distance is 100 mm.
2) Selecting high-purity Al particles (with the purity of 99.999%) with the diameter of 5mm as an electron beam vacuum coating material; according to the technical requirements of electron beam evaporation coating equipment, the filament voltage is 100V, the filament current is 1A, the beam current is 300mA, the evaporation time is 80 minutes, and the thickness of an aluminum film is 800 nm.
3) Presetting an aluminum foil as an absorption layer on the surface of the NiCrAlY protective coating which is plated with the Al film by vaporization, and adopting flowing water as a restraint layer;
4) the nanosecond pulse laser is used for carrying out laser shock treatment, the diameter of a light spot is selected to be 5mm, the pulse energy is 3J, the pulse width is 10ns, and the lap joint rate is 35%. The nano-scale Al film is completely embedded into the surface layer of the NiCrAlY protective coating by utilizing the laser shock wave effect, and the Al-rich strengthening layer is prepared on the surface of the NiCrAlY protective coating.
Observing the surface appearance of the coating prepared by the atmospheric plasma spraying process and the three combined processes by adopting a JSM-IT300 type scanning electron microscope, wherein the surface of the coating prepared by the atmospheric plasma spraying process is loose and porous, and a large amount of unmelted or semi-melted small particles are dispersed and distributed; the MCrAlY coating obtained by three combined processes of atmospheric plasma spraying, electron beam evaporation coating and laser impact has a very compact surface and does not have obvious holes; in addition, according to the original component proportion, the Al content of the surface of the coating prepared by the atmospheric plasma spraying is less than 13% of the total content, but the Al content of the surface of the coating prepared by the three combined processes reaches 35% of the total content, and the Al content of the surface of the coating is greatly improved. 1050oC, the result of the high-temperature oxidation resistant experiment shows that in the initial stage (5h) of high-temperature oxidation, a protective oxide film on the surface of the coating prepared by atmospheric plasma spraying is not formed, the oxide film mainly consists of mixed oxides, and the local area even has an internal oxidation phenomenon; in contrast, the protective coating surface prepared by the three combined processes can quickly form a layer of continuous and compact Al with a thin thickness2O3Protective layer, early formed Al2O3The structure of the oxide film has important influence on the high-temperature oxidation resistance of the coating, thereby showing that the high-temperature oxidation resistance of the coating prepared by the three combined processes is obviously improved.
Example three.
A treatment method for improving the Al content and the high-temperature service performance of the surface of a CoCrAlY protective coating comprises the following steps:
1) after the high-temperature alloy matrix is subjected to pre-grinding, cleaning and sand blasting roughening treatment, a CoCrAlY coating (Cr Wt.23%, Al Wt.13%, Y0.5 Wt%, Co Bal.) is deposited on the surface of the high-temperature alloy matrix by using an atmospheric plasma spraying technology, and the thickness of the CoCrAlY coating is 200 mu m; according to the technical requirements of the atmospheric plasma spraying equipment, the voltage is selected to be 30V, the current is 900A, the powder feeding rate is controlled to be 2r/min, the speed of a spray gun is 500mm/s, and the spraying distance is 70 mm.
2) Selecting high-purity Al particles (the purity is 99.999%) with the diameter of 2mm as an electron beam vacuum coating material; according to the technical requirements of electron beam evaporation coating equipment, filament voltage of 150V, filament current of 0.5A, beam current of 100mA, evaporation time of 100 minutes and aluminum film thickness of 1200nm are selected.
3) Pre-arranging black paint on the surface of the CoCrAlY protective coating which is evaporated with the Al film to be used as an absorption layer, and adopting K9 glass as a constraint layer;
4) a nanosecond pulse laser is used for carrying out laser shock treatment, the diameter of a light spot is 2mm, the pulse energy is 10J, the pulse width is 10ns, and the lap joint rate is 30%. The laser shock wave effect is utilized to enable the nanoscale Al film to be completely embedded into the surface layer of the CoCrAlY protective coating, and the Al-rich strengthening layer is prepared on the surface of the CoCrAlY protective coating.
Observing the surface appearance of the coating prepared by the atmospheric plasma spraying process and the three combined processes by adopting a JSM-IT300 type scanning electron microscope, wherein the surface of the coating prepared by the atmospheric plasma spraying process is loose and porous, and a large amount of unmelted or semi-melted small particles are dispersed and distributed; the MCrAlY coating obtained by three combined processes of atmospheric plasma spraying, electron beam evaporation coating and laser impact has a very compact surface and does not have obvious holes; in addition, according to the original component proportion, the Al content of the surface of the coating prepared by the atmospheric plasma spraying is less than 13 percent of the total content, but the Al content of the surface of the coating prepared by the three combined processes reaches 45 percent of the total content, and the Al content of the surface of the coating is greatly improved. 1050oThe results of the C high temperature oxidation resistance experiment show that, in the initial period (5h) of high temperature oxidation, the protective oxide film on the surface of the coating prepared by atmospheric plasma spraying is not formed, and the oxide film is mainly composed of mixed oxidesAnd local areas even have internal oxidation phenomena; in contrast, the protective coating surface prepared by the three combined processes can quickly form a layer of continuous and compact Al with a thin thickness2O3Protective layer, early formed Al2O3The structure of the oxide film has important influence on the high-temperature oxidation resistance of the coating, thereby showing that the high-temperature oxidation resistance of the coating prepared by the three combined processes is obviously improved.
Example four.
A treatment method for improving the Al content and the high-temperature service performance of the surface of a NiCrAlY protective coating comprises the following steps:
1) after the high-temperature alloy matrix is subjected to pre-grinding, cleaning and sand blasting roughening treatment, an NiCrAlY coating (Cr Wt.23%, Al Wt.13%, Y0.5 Wt% and Ni Bal.) is deposited on the surface of the high-temperature alloy matrix by using an atmospheric plasma spraying technology, and the thickness of the high-temperature alloy matrix is 100 mu m; according to the technical requirements of atmospheric plasma spraying equipment, the voltage is selected to be 50V, the current is 700A, the powder feeding rate is controlled to be 10r/min, the speed of a spray gun is 300mm/s, and the spraying distance is 100 mm.
2) Selecting high-purity Al particles (with the purity of 99.999%) with the diameter of 5mm as an electron beam vacuum coating material; according to the technical requirements of electron beam evaporation coating equipment, the filament voltage is 100V, the filament current is 1A, the beam current is 300mA, the evaporation time is 20 minutes, and the thickness of an aluminum film is 200 nm.
3) Presetting an aluminum foil as an absorption layer on the surface of the NiCrAlY protective coating which is plated with the Al film by vaporization, and adopting flowing water as a restraint layer;
4) a nanosecond pulse laser is used for carrying out laser shock treatment, the diameter of a light spot is 10mm, the pulse energy is 2J, the pulse width is 10ns, and the lap joint rate is 80%. The nano-scale Al film is completely embedded into the surface layer of the NiCrAlY protective coating by utilizing the laser shock wave effect, and the Al-rich strengthening layer is prepared on the surface of the NiCrAlY protective coating.
Observing the surface appearance of the coating prepared by the atmospheric plasma spraying process and the three combined processes by adopting a JSM-IT300 type scanning electron microscope, wherein the surface of the coating prepared by the atmospheric plasma spraying process is loose and porous, and a large amount of unmelted or semi-melted small particles are dispersed and distributed; by atmospheric plasma sprayingThe MCrAlY coating obtained by the three combined processes of electron beam evaporation coating and laser impact has very compact surface and no obvious holes; in addition, according to the original component proportion, the Al content of the surface of the coating prepared by the atmospheric plasma spraying is less than 13% of the total content, but the Al content of the surface of the coating prepared by the three combined processes reaches 20% of the total content, and the Al content of the surface of the coating is greatly improved. 1050oC, the result of the high-temperature oxidation resistant experiment shows that in the initial stage (5h) of high-temperature oxidation, a protective oxide film on the surface of the coating prepared by atmospheric plasma spraying is not formed, the oxide film mainly consists of mixed oxides, and the local area even has an internal oxidation phenomenon; in contrast, the protective coating surface prepared by the three combined processes can quickly form a layer of continuous and compact Al with a thin thickness2O3Protective layer, early formed Al2O3The structure of the oxide film has important influence on the high-temperature oxidation resistance of the coating, thereby showing that the high-temperature oxidation resistance of the coating prepared by the three combined processes is obviously improved.
Example five.
The difference between the embodiment and the first embodiment is that the protective coating adopts CoNiCrAlY, and the other parameters are the same as those of the first embodiment, and the performance is similar.
Example six.
The difference between the embodiment and the second embodiment is that NiCoCrAlY is adopted as the protective coating, the other parameters are the same as those of the second embodiment, and the performance is similar.
The parts not involved in the present invention are the same as or can be implemented using the prior art.
Claims (6)
1. A processing method for improving the Al content and the high-temperature service performance of the surface of an MCrAlY protective coating is characterized in that a high-performance MCrAlY protective coating with an Al-rich surface layer is prepared by combining a combined process of laser impact, electron beam vapor deposition and atmospheric plasma spraying, a nanoscale Al film which is subjected to vacuum evaporation on the surface of the MCrAlY protective coating in advance is embedded into the surface of a coating strengthening layer through laser-induced ultrahigh-pressure impact force to form the Al-rich layer, and meanwhile, the laser impact effect is utilized to improve the surface density of the coating, realize grain refinement and residual stress adjustment.
2. The method according to claim 1, characterized in that it comprises the steps of:
(1) depositing an MCrAlY protective coating on the surface of the high-temperature alloy substrate by adopting an atmospheric plasma spraying technology;
(2) depositing a nano-scale Al film on the surface of the MCrAlY protective coating by adopting an electron beam evaporation coating technology;
(3) arranging black paint or aluminum foil as an absorption layer and K9 glass or flowing water as a restraint layer on the MCrAlY protective coating deposited with the nano-scale Al film; carrying out laser shock treatment on the MCrAlY protective coating with the preset Al film by using a nanosecond laser, embedding Al nano-particles into the surface of the MCrAlY protective coating by using a laser shock wave effect to form an Al-rich surface strengthening layer, and regulating and controlling the surface microstructure and the stress state of the MCrAlY protective coating;
(4) and soaking the high-temperature alloy matrix subjected to laser shock treatment by using acetone to remove the residual constraint layer on the surface, thereby obtaining the MCrAlY strengthened coating with the Al-rich surface.
3. The method of claim 2, wherein: the MCrAlY protective coating in the step (1) is NiCrAlY, CoCrAlY, NiCoCrAlY or CoNiCrAlY.
4. The method of claim 2, wherein: the technical parameters of the atmospheric plasma spraying are as follows: the voltage is 30-50V, the current is 700-900A, the powder feeding rate is 2-10 r/min, the spraying speed is 300-500 mm/s, and the spraying distance is 70-100 mm.
5. The method of claim 2, wherein: the parameters of the electron beam evaporation coating in the step (2) are as follows: the filament voltage is 100-150V, the filament current is 0.5-1A, the beam current is 100-300 mA, the evaporation time is 20-100 min, and the thickness of the aluminum plating film is 200-1200 nm.
6. The method of claim 2, wherein: the laser shock peening technical parameters of the step (4) are as follows: the laser pulse energy is 2-10J, the spot diameter is 2-5 mm, and the lap joint rate is 30-80%.
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