Processing technology of dispersion micropore / oxide reinforced AlCoCrFeNi2.1 high-entropy alloy bonding layer

Abstract

The invention provides a processing technology of a dispersion micropore / oxide reinforced AlCoCrFeNi2.1 high-entropy alloy bonding layer, and relates to the technical field of processing of high-entropy alloy bonding layers. According to the processing technology, carbon is easy to oxidize in a high-speed laser cladding molten pool to form gaseous CO and CO2, and after escaping, a dispersion micropore bonding layer bottom layer easy to release stress is obtained; preparing a nano RE3TaO7 reinforced bonding layer top layer by adopting high-speed laser cladding according to the principle that an oxide obstructs Al diffusion; a pretreatment method is combined and comprises heat treatment and surface laser remelting, and finally the novel composite coating is obtained. The method is simple in process, high in controllability, good in operability, low in energy consumption, controllable in cost, environmentally friendly, free of pollution and beneficial to industrial large-scale production and popularization. The anti-falling capability of the obtained composite coating on the surface YSZ ceramic heat insulation layer is obviously superior to that of a single high-speed laser cladding AlCoCrFeNi2.1 high-entropy alloy bonding layer.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of high-entropy alloy adhesive layer processing, and particularly relates to a dispersed micropore / oxide reinforced AlCoCrFeNi 2.1 The application relates to the technical field of high-entropy alloy adhesive layer processing, and particularly relates to a dispersed micropore / oxide reinforced AlCoCrFeNi BACKGROUND

[0002] The adhesive layer is considered to be a layer that is crucial in a thermal barrier coating system, has the function of connecting the upper and lower layers, and even determines the thermal stability and service life of the whole coating system. At present, the more advanced MCrAlY (M=Ni, Co) adhesive layer material mainly has problems of insufficient oxidation resistance, serious interdiffusion between the adhesive layer and the substrate, and insufficient high-temperature strength, so that the service temperature is less than 1100 DEG C, and the application temperature requirement of the next generation of super-high-temperature thermal barrier coating cannot be met, and therefore a new type of high-temperature-resistant adhesive layer material needs to be developed.

[0003] In recent years, high-entropy alloys are expected to become candidate materials for the next generation of thermal barrier coating adhesive layers due to their excellent high-temperature stability, oxidation resistance and relatively low thermal expansion coefficient, especially AlCoCrFeNi 2.1 High-entropy alloys are most expected to be applied.

[0004] Chinese patent CN112195463A discloses a laser cladding AlCoCrFeNi / NbC gradient high-entropy alloy coating material and a method, which is used for synergistically enhancing the hardness and wear resistance of the coating, and reducing the residual stress and crack driving force through niobium carbide and gradient structure; however, laser cladding can make the microstructure of the subsequently prepared coating and the microstructure of the vicinity of the interface of the previously prepared coating be repeatedly melted, so that the content distribution of the niobium carbide is not strictly increased in gradient, and some parts may appear first increase and then decrease or first decrease and then increase, and the performance distribution of the prepared coating is uneven.

[0005] The adhesive layer is usually prepared by a thermal spraying method, but the high porosity and low substrate-coating bonding strength limit the full play of the oxidation resistance, the high-speed laser cladding coating has dense microstructure, low coating dilution rate and excellent coating-substrate bonding strength, and is expected to replace the traditional thermal spraying adhesive layer preparation method; however, the AlCoCrFeNi 2.1 Although the high-entropy alloy adhesive layer has excellent high-temperature oxidation resistance, during high-temperature service, the internal stress of the high-entropy alloy adhesive layer cannot be effectively released due to the dense structure, so that the top ceramic coating will be quickly peeled off.

[0006] Chinese patent CN112323024A discloses a high-strength antioxidant coating and its preparation method and application. The high-strength antioxidant coating has a multilayer structure of periodically arranged AlCoCrFeNi layers and Cr2AlC layers, and the thickness ratio of the AlCoCrFeNi layers to the Cr2AlC layers is (1-3):1. The AlCoCrFeNi layers ensure the high oxidation resistance of the coating, and the Cr2AlC layers help to reduce the stress of the coating and enhance the strength of the coating. The thickness uniformity of the alternating coating prepared by magnetron sputtering is poor, the performance distribution is uneven, the bonding strength between the layers is not high, and it is not suitable for attaching a zirconia ceramic layer on the surface as a bonding layer. It is even more difficult to expect that it can reduce the probability of zirconia ceramic layer falling off.

[0007] Chinese patent CN117684163A discloses a wear-resistant and impact-resistant bionic structure composite coating and a preparation method thereof. The wear-resistant and impact-resistant bionic structure composite coating includes at least one bionic structure layer composed of a first strip made of soft material and a second strip made of hard material. The bionic structure layers are arranged perpendicular to each other, and the width surface and the length surface of the bionic structure layer on the upper end surface and / or the lower end surface are located in the same plane. Obviously, this method can reduce stress concentration at the bonding site of the coating and the substrate, thereby avoiding defects such as cracking. However, it is difficult to attach a zirconia ceramic layer on the surface. Moreover, the preparation process is complex and not suitable for large-scale industrial production.

[0008] Chinese patent CN120041828A discloses a PVD composite coating and a preparation method thereof. The PVD composite coating is formed by using a composite target to deposit on a pretreated substrate surface by magnetron sputtering, multiple plasma spraying, and laser texturing, and repeating the above process to form a composite coating containing a third rare earth doped high-entropy alloy coating. The composite coating is obtained by post-treatment of the composite coating. Therefore, the multiple preparation and treatment processes of the composite coating are difficult to effectively control the quality of each layer, and the addition of the third rare earth increases the preparation cost, and the gradient content change operation is difficult.

[0009] Therefore, it is necessary to develop a new coating structure and a processing method to release the internal stress of the adhesive layer during service while ensuring the oxidation resistance of the adhesive layer. SUMMARY

[0010] The purpose of the present application is to provide a dispersion micropore / oxide reinforced AlCoCrFeNi 2.1 high-entropy alloy adhesive layer processing technology to solve the problem of rapid falling off of the top ceramic layer during service of the AlCoCrFeNi 2.1 high-entropy alloy adhesive layer due to the dense microstructure which cannot release the internal stress.

[0011] A dispersion micro-hole / oxide reinforced AlCoCrFeNi 2.1 A processing procedure of high-entropy alloy adhesive layer, the dispersion micro-hole / oxide reinforced AlCoCrFeNi 2.1 The processing procedure of high-entropy alloy adhesive layer comprises the following steps:

[0012] S1, preparation of oxide nanoparticle mixed high-entropy alloy composite powder:

[0013] Preparation of RE3TaO7 nano-oxide particle dispersion strengthened composite powder: by means of ball milling powder mixing, RE3TaO7 nano-oxide particles are added into AlCoCrFeNi 2.1 RE3TaO7 nano-oxide particles are added into high-entropy alloy spherical pre-alloy powder, and the high-entropy alloy spherical pre-alloy powder is pretreated, ball-mixed and sieved in an argon protective atmosphere to obtain the dispersion micro-hole / oxide reinforced AlCoCrFeNi

[0014] Preparation of diamond micro-powder dispersion strengthened composite powder: by means of ball milling powder mixing, diamond micro-powder is added into AlCoCrFeNi 2.1 The diamond micro-powder is added into high-entropy alloy pre-alloy powder, and the high-entropy alloy pre-alloy powder is ball-mixed and sieved in an argon protective atmosphere to obtain the dispersion micro-hole / oxide reinforced AlCoCrFeNi

[0015] S2, preparation of dispersion micro-hole / oxide reinforced AlCoCrFeNi 2.1 Preparation of high-entropy alloy adhesive layer:

[0016] Preparation of dispersion micro-hole adhesive layer bottom layer: the dispersion micro-hole adhesive layer bottom layer is prepared by means of high-speed laser cladding technology, diamond micro-powder dispersion strengthened composite powder is cladded on a GH4169 substrate to obtain the dispersion micro-hole adhesive layer bottom layer;

[0017] Preparation of oxide dispersion strengthened adhesive layer top layer: the oxide dispersion strengthened adhesive layer top layer is prepared by means of high-speed laser cladding technology, oxide dispersion strengthened composite powder is cladded on the dispersion micro-hole adhesive layer bottom layer to obtain the oxide dispersion strengthened adhesive layer top layer;

[0018] S3, pretreatment of high-entropy alloy adhesive layer:

[0019] A heat treatment: the prepared dispersion micro-hole / oxide reinforced AlCoCrFeNi 2.1 The high-entropy alloy adhesive layer sample is placed in a muffle furnace, and after temperature rising and holding, the sample is taken out and air-cooled;

[0020] Surface laser remelting treatment: high-speed laser cladding is adopted to slightly melt the surface of the coating, so as to reduce the surface roughness, and realize spraying of a ceramic heat insulation layer thereon.

[0021] Optionally, in S1, the AlCoCrFeNi 2.1The high-entropy alloy spherical pre-alloyed powder is prepared by a vacuum induction melting gas atomization method and is screened to obtain; the vacuum induction melting gas atomization powder preparation process is that: the atomization gas is argon, the atomization pressure is 4 MPa, and the melting temperature is 1490-1500 ℃.

[0022] Optionally, the AlCoCrFeNi 2.1 The high-entropy alloy spherical pre-alloyed powder is pretreated by placing the pre-alloyed powder in the 15-53 μm interval segment obtained by screening in a vacuum oven, closing the cabin door, using a vacuum pump to vacuum the pressure in the oven to 10 -1 Pa, then heating the oven to 80 ℃ and keeping for 3 h to remove the residual moisture in the pre-alloyed powder.

[0023] Optionally, the RE3TaO7 nano-oxide particle dispersion strengthened composite powder is prepared in S1, and the AlCoCrFeNi 2.1 The size of the high-entropy alloy spherical pre-alloyed powder is 15-53 μm, the doping amount of the RE3TaO7 nano-oxide particle is 1-5%, and the ball-milling and mixing of the powder is carried out in an argon protective atmosphere, at a rotation speed of 100-150 rmp, an intermittent ratio of 5:1, a ball-to-material ratio of 5:1, and the ball mill tank and the grinding ball are both made of stainless steel.

[0024] Optionally, the diamond micro-powder dispersion strengthened composite powder is prepared in S1, and the AlCoCrFeNi 2.1 The size of the high-entropy alloy pre-alloyed powder is 15-53 μm, the addition amount of the 5-10 μm diamond micro-powder is 5-10%, and the ball-milling and mixing of the powder is carried out in an argon protective atmosphere, at a rotation speed of 150-250 rmp, an intermittent ratio of 10:1, a ball-to-material ratio of 8:1, and the ball mill tank and the grinding ball are both made of stainless steel.

[0025] Optionally, the screening treatment in S1 is that the ball-milling and mixing of the powder raw materials are separated by a screen to obtain the high-entropy alloy composite powder mixed with RE3TaO7 nano-particles.

[0026] Optionally, the dispersion micropore adhesive layer bottom layer is prepared in S2, and the diamond micro-powder will react as follows during the molten pool metallurgy process: C+½O2→CO △G ○ =-275 kJ / mol (T=1600 ℃); CO+½O2→CO2 △G ○ =-120 kJ / mol (T=1600 ℃), a large amount of gaseous CO and CO2 are formed, resulting in the dispersion micropore AlCoCrFeNi 2.1High-entropy alloy composite coating; coating thickness in the range of 50-200 μm, cladding line speed in the range of 15-25 m / min, laser power in the range of 1.5-2.1 kW, powder feeding flow rate of 20-25 g / min.

[0027] Optionally, in S2, high-speed laser cladding technology is adopted, cladding line speed in the range of 35-50 m / min, cladding power in the range of 1.5-2.8 kW, powder feeding flow rate in the range of 35-45 g / min, oxide dispersion strengthened composite powder is cladded on the dispersion microporous adhesive layer bottom layer to prepare RE3TaO7 nano-oxide particle dispersion strengthened AlCoCrFeNi 2.1 High-entropy alloy top layer.

[0028] Optionally, the hardness of the dispersion microporous adhesive layer bottom layer is 260-300 HV, the porosity is 2-6%, and the oxidation weight gain after 200 h of high-temperature holding at 1100℃ is 2.5-4 mg / cm 2 , AlCoCrFeNi 2.1 The adhesion between the high-entropy alloy bottom layer and the substrate is 250-300 MPa.

[0029] Optionally, the RE3TaO7 nano-oxide particle dispersion strengthened AlCoCrFeNi 2.1 The hardness of the high-entropy alloy top layer is 330-350 HV, the porosity is 0.3-0.5%, and the oxidation weight gain after 200 h of high-temperature holding at 1100℃ is 0.5-0.6 mg / cm 2 , AlCoCrFeNi 2.1 The adhesion between the high-entropy alloy top layer and the bottom layer is 260-310 MPa.

[0030] Optionally, in S3, the heating rate of one kind of heat treatment is 5-10℃ / min, the furnace is raised from room temperature to 1050℃ and held for 0.5-1.0 h before being taken out for air cooling treatment.

[0031] Optionally, in S3, the remelting treatment process of the surface laser remelting treatment is: laser power in the range of 0.5-1.0 kW, line speed in the range of 35-45 m / min.

[0032] Optionally, the RE3TaO7 nano-oxide particle dispersion strengthened AlCoCrFeNi 2.1 The hardness of the high-entropy alloy top layer is 380-400 HV, the porosity is 0.3-0.4%, and the oxidation weight gain after 200 h of high-temperature holding at 1100℃ is 0.3-0.4 mg / cm 2 , AlCoCrFeNi 2.1The adhesion between the high-entropy alloy top layer and the bottom layer is 260-310 MPa.

[0033] Optionally, S4 is further included, and the RE3TaO7 nano-oxide particle dispersion strengthened AlCoCrFeNi 2.1 A ceramic thermal barrier layer of 100-200 microns is sprayed on the high-entropy alloy top layer.

[0034] Optionally, the composition of the ceramic thermal barrier layer is at least one of YSZ ceramic, fully stabilized zirconia, and partially stabilized zirconia.

[0035] Technical principle of the application: high-speed laser cladding RE3TaO7 nano-oxide particle dispersion strengthened AlCoCrFeNi 2.1 The high-entropy alloy top layer has excellent oxidation resistance combined with high-speed cladding dispersion micro-pore strengthened AlCoCrFeNi 2.1 The high-entropy alloy bottom layer has stress release characteristics during cyclic high-temperature oxidation, ensuring that the YSZ ceramic top layer does not fall off due to thermal expansion stress mismatch during service.

[0036] Compared with the prior art, the above technical solution has at least the following beneficial effects:

[0037] The above scheme proposes a dispersion micro-pore / oxide strengthened AlCoCrFeNi 2.1 The processing technology of the high-entropy alloy adhesive layer can solve the problem of high-speed laser cladding AlCoCrFeNi 2.1 During service, the high-entropy alloy adhesive layer has dense microstructure, which causes internal stress to be unable to be released, resulting in rapid falling off of the top ceramic layer.

[0038] The application can make the dense RE3TaO7 nano-oxide particle dispersion strengthened AlCoCrFeNi 2.1 The high-entropy alloy coating top layer has excellent oxidation resistance; at the same time, the dispersion micro-pore strengthened AlCoCrFeNi 2.1 The high-entropy alloy bottom layer provides sufficient stress release space for the cyclic oxidation process, avoiding falling off of the YSZ ceramic top layer under thermal expansion stress mismatch.

[0039] The application can make the metal adhesive layer have dense microstructure characteristics to ensure excellent oxidation resistance, and the porous coating top layer ensures stress release during oxidation, avoiding falling off of the YSZ ceramic top layer.

[0040] The application can make the RE3TaO7 nano-oxide particles of the AlCoCrFeNi 2.1 The high-entropy alloy coating top has a finer grain size, further improving the oxidation resistance of the top layer; at the same time, the laser surface remelting optimizes the surface roughness of the high-speed cladding coating, and improves the bonding performance of the YSZ coating and the metal bonding layer.

[0041] The preparation method has simple process, high controllability, good operability, low energy consumption, controllable cost, environmental protection, no pollutant emission, and potential for industrial application.

[0042] In summary, compared with other traditional methods, the method can prepare the high-entropy alloy composite powder mixed with polyoxide nanoparticles, disperse the microporous / oxide reinforced AlCoCrFeNi 2.1 The prepared bonding layer will not obviously fall off the surface ceramic thermal insulation layer after high-temperature thermal cycle oxidation; the preparation method has simple process, high controllability, good operability, low energy consumption, controllable cost, environmental protection, no pollution, and is beneficial to industrial large-scale production and promotion. BRIEF DESCRIPTION OF DRAWINGS

[0043] In order to more clearly illustrate the technical solutions in the embodiments of the application, the drawings needed in the embodiment description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the application, and other drawings can be obtained by those skilled in the art without creative labor.

[0044] Figure 1 is a microporous / oxide reinforced AlCoCrFeNi 2.1 Partial microstructure diagram of the microporous bonding layer bottom layer in the high-entropy alloy bonding layer

[0045] Figure 2 is a microporous / oxide reinforced AlCoCrFeNi 2.1 Partial microstructure diagram of the oxide reinforced bonding layer top layer in the high-entropy alloy bonding layer

[0046] Figure 3 is a microporous / oxide reinforced AlCoCrFeNi 2.1 The thermal expansion coefficient of the coating after pretreatment of the high-entropy alloy bonding layer changes with temperature

[0047] Figure 4is a dispersion micropore / oxide reinforced AlCoCrFeNi 2.1 The surface morphology diagram of the high-entropy alloy adhesive layer after spraying YSZ ceramic barrier on the surface and then being subjected to thermal measurement cycle oxidation at 1200 DEG C;

[0048] Figure 5 is a high-speed cladding AlCoCrFeNi of the present application comparative example 1 2.1 The surface morphology diagram of the high-entropy alloy adhesive layer after spraying YSZ ceramic barrier on the surface and then being subjected to thermal measurement cycle oxidation at 1200 DEG C;

[0049] Figure 6 is a dispersion micropore / oxide reinforced AlCoCrFeNi 2.1 The surface morphology diagram of the high-entropy alloy adhesive layer after spraying YSZ ceramic barrier on the surface and then being subjected to thermal measurement cycle oxidation at 1200 DEG C;

[0050] Figure 7 is a dispersion micropore / oxide reinforced AlCoCrFeNi 2.1 The surface morphology diagram of the high-entropy alloy adhesive layer after spraying YSZ ceramic barrier on the surface and then being subjected to thermal measurement cycle oxidation at 1200 DEG C. DETAILED DESCRIPTION

[0051] The technical solutions in the present application will be described below with reference to the drawings.

[0052] In the embodiments of the present application, the words such as "example", "for example" are used to represent as an example, illustration or description. Any embodiment or design scheme described as "example" in the present application should not be interpreted as more preferred or more advantageous than other embodiments or design schemes. Rather, the word "example" is intended to present the concept in a specific manner. In addition, in the embodiments of the present application, the meaning expressed by "and / or" can be both, or can be one of the two.

[0053] In the embodiments of the present application, "image" and "picture" can be used interchangeably at times. It should be pointed out that when the distinction is not emphasized, the meanings expressed are consistent.

[0054] In the embodiments of the present application, sometimes the subscript such as W1 can be written in the form of non-subscript such as W1. When the distinction is not emphasized, the meanings expressed are consistent.

[0055] In order to make the technical problems, technical solutions and advantages of the present application more clear, the following will be described in detail with reference to the drawings and specific embodiments.

[0056] A dispersion micropore / oxide reinforced AlCoCrFeNi 2.1Processing technology of high-entropy alloy adhesive layer, the dispersed micropore / oxide reinforced AlCoCrFeNi 2.1 The processing technology of high-entropy alloy adhesive layer comprises the following steps:

[0057] S1, preparation of oxide nanoparticle mixed high-entropy alloy composite powder:

[0058] Preparation of RE3TaO7 nano-oxide particle dispersion strengthened composite powder: using ball milling powder mixing method, adding diamond micro-powder into AlCoCrFeNi 2.1 High-entropy alloy spherical pre-alloyed powder, and in an argon atmosphere, using high-entropy alloy spherical pre-alloyed powder pretreatment, ball milling, and screening treatment to obtain;

[0059] Preparation of diamond micro-powder dispersion strengthened composite powder: using ball milling powder mixing method, adding diamond micro-powder into AlCoCrFeNi 2.1 High-entropy alloy pre-alloyed powder, and in an argon atmosphere, using ball milling, and screening treatment to obtain;

[0060] S2, preparation of dispersed micropore / oxide reinforced AlCoCrFeNi 2.1 High-entropy alloy adhesive layer:

[0061] Preparation of dispersed micropore adhesive layer bottom layer: using high-speed laser cladding technology, diamond micro-powder dispersion strengthened composite powder is cladded on GH4169 substrate to obtain the dispersed micropore adhesive layer bottom layer; the local microstructure of the dispersed micropore adhesive layer bottom layer is shown in Figure 1 The uniformly dispersed nano-scale to micron-scale irregular pores are uniformly dispersed in the coating;

[0062] Preparation of oxide dispersion strengthened adhesive layer top layer: using high-speed laser cladding technology, oxide dispersion strengthened composite powder is cladded on the dispersed micropore adhesive layer bottom layer to obtain the oxide dispersion strengthened adhesive layer top layer; the local microstructure of the oxide dispersion strengthened adhesive layer top layer is shown in Figure 2 The overall coating shows a dual-phase structure, and the nano-sized RE3TaO7 oxide is uniformly and dispersedly distributed in the phase interface region;

[0063] S3, high-entropy alloy adhesive layer pretreatment:

[0064] A kind of heat treatment: the dispersed micropore / oxide reinforced AlCoCrFeNi 2.1 High-entropy alloy adhesive layer sample is placed in a muffle furnace, and after temperature rising and holding, it is taken out and air-cooled;

[0065] Surface laser remelting treatment: using high-speed laser cladding, the surface of the coating is slightly melted to reduce the surface roughness, so as to realize the spraying of ceramic thermal barrier layer thereon.

[0066] The thermal expansion coefficient of the high-entropy alloy adhesive layer pretreated coating changes with temperature as shown in the figure Figure 3 As the temperature increases, the thermal expansion coefficient first decreases and then increases.

[0067] In particular, in S1, AlCoCrFeNi 2.1 The high-entropy alloy spherical pre-alloyed powder is prepared by a vacuum induction melting gas atomization method and is sieved to obtain; the vacuum induction melting gas atomization powder preparation process is: the atomizing gas is argon, the atomizing pressure is 4 MPa, and the melting temperature is 1490-1500℃.

[0068] In particular, in S1, AlCoCrFeNi 2.1 The high-entropy alloy spherical pre-alloyed powder pretreatment is to place the sieved 15-53μm interval pre-alloyed powder in a vacuum oven, close the hatch, and use a vacuum pump to vacuum the pressure in the oven to 10 -1 Pa, then heat the oven to 80℃ and keep for 3h to remove the residual moisture in the pre-alloyed powder.

[0069] In particular, in S1, RE3TaO7 nano-oxide particle dispersion strengthened composite powder is prepared, AlCoCrFeNi 2.1 The size of the high-entropy alloy spherical pre-alloyed powder is 15-53μm, the doping amount of RE3TaO7 nano-oxide particles is 1-5%, and the ball-milling and mixing of the powder is carried out in an argon protective atmosphere, at a rotation speed of 100-150rmp, an intermittent ratio of 5:1, a ball-to-material ratio of 5:1, and the ball mill tank and grinding balls are made of stainless steel.

[0070] In particular, in S1, diamond micro-powder dispersion strengthened composite powder is prepared, AlCoCrFeNi 2.1 The size of the high-entropy alloy pre-alloyed powder is 15-53μm, the addition amount of 5-10μm diamond micro-powder is 5-10%, and the ball-milling and mixing of the powder is carried out in an argon protective atmosphere, at a rotation speed of 150-250rmp, an intermittent ratio of 10:1, a ball-to-material ratio of 8:1, and the ball mill tank and grinding balls are made of stainless steel.

[0071] In particular, in S1, the sieving treatment is to separate the powder material from the grinding balls by using a sieve to obtain RE3TaO7 nano-particle mixed high-entropy alloy composite powder.

[0072] In particular, in S2, the dispersion microporous adhesive layer bottom layer is prepared, and the diamond micro-powder will react as follows during the molten pool metallurgy process: C+½O2→CO △G ○ =-275kJ / mol (T=1600℃); CO+½O2→CO2 △G ○= -120 kJ / mol (T = 1600 °C), forming a large amount of gaseous CO and CO2, resulting in a diffuse microporous AlCoCrFeNi 2.1 High-entropy alloy composite coating; coating thickness in the range of 50-200 pm, cladding line speed in the range of 15-25 m / min, laser power in the range of 1.5-2.1 kW, powder feeding flow rate of 20-25 g / min.

[0073] In particular, in S2, high-speed laser cladding technology is adopted, the cladding line speed is in the range of 35-50 m / min, the cladding power is in the range of 1.5-2.8 kW, the powder feeding flow rate is in the range of 35-45 g / min, and the RE3TaO7 nano-oxide particle dispersed reinforced AlCoCrFeNi 2.1 High-entropy alloy top layer.

[0074] In particular, the hardness of the diffuse microporous adhesive layer bottom layer is 260-300 HV, the porosity is more than 2-6%, and the oxidation weight gain after 200 h of high-temperature holding at 1100 °C is 2.5-4 mg / cm 2 AlCoCrFeNi 2.1 The adhesion between the high-entropy alloy bottom layer and the substrate is 250-300 MPa.

[0075] In particular, the RE3TaO7 nano-oxide particle dispersed reinforced AlCoCrFeNi 2.1 The hardness of the high-entropy alloy top layer is 330-350 HV, the porosity is 0.3-0.5%, and the oxidation weight gain after 200 h of high-temperature holding at 1100 °C is 0.5-0.6 mg / cm 2 AlCoCrFeNi 2.1 The adhesion between the high-entropy alloy top layer and the bottom layer is 260-310 MPa.

[0076] In particular, in S3, the heating rate of one kind of heat treatment is 5-10 °C / min, and the sample is taken out after being heated to 1050 °C at a constant rate and holding for 0.5-1.0 h and then air-cooled.

[0077] In particular, in S3, the remelting treatment process of the surface laser remelting treatment is that the laser power is in the range of 0.5-1.0 kW, and the line speed is in the range of 35-45 m / min.

[0078] In particular, the RE3TaO7 nano-oxide particle dispersed reinforced AlCoCrFeNi 2.1The hardness of the high-entropy alloy top layer is 380-400HV, the porosity is 0.3-0.4%, and the oxidation weight gain after 200h of high-temperature holding at 1100℃ is 0.3-0.4mg / cm 2 , AlCoCrFeNi 2.1 The adhesion between the high-entropy alloy top layer and the bottom layer is 260-310MPa.

[0079] In particular, S4 is also included, and the RE3TaO7 nano-oxide particle dispersion strengthened AlCoCrFeNi 2.1 A ceramic thermal barrier layer of 100-200μm is sprayed on the high-entropy alloy top layer.

[0080] In particular, the composition of the ceramic thermal barrier layer is at least one of YSZ ceramic, fully stabilized zirconia and partially stabilized zirconia.

[0081] Embodiment 1

[0082] One dispersion micro-pore / oxide strengthened AlCoCrFeNi 2.1 The processing technology of the high-entropy alloy adhesive layer is as follows: 2.1 The processing technology of the high-entropy alloy adhesive layer is as follows:

[0083] S1, preparation of high-entropy alloy composite powder mixed with oxide nano-particles:

[0084] Preparation of RE3TaO7 nano-oxide particle dispersion strengthened composite powder:

[0085] First, Al, Co, Cr, Fe and Ni block materials with a purity higher than 99.9% are selected, and 50kg of mixed raw materials are weighed according to the ratio of 38.88%-Ni, 18.59%-Co, 17.62%Fe, 16.40%-Cr and 8.51%-Al. The mixed materials are alloyed and atomized into spherical pre-alloyed powder materials by using the preferred vacuum induction melting gas atomization powdering process, and the pre-alloyed powder in the interval of 15-53μm is obtained by using the air separation equipment for screening;

[0086] The preferred vacuum induction melting gas atomization powdering process is divided into an alloying melting process and a high-temperature melt atomization process.

[0087] The alloying melting process is as follows: after closing the melting chamber door, vacuum is first extracted to 10 -1 Pa, 99.9% high-purity argon gas is introduced to 10kPa pressure, and the mixed raw materials are heated to 1500℃ by using the melting crucible under the induction heating power of 250kW, and then held for 15min to start preparation for casting;

[0088] The high-temperature melt atomization process is: after the heat preservation crucible is heated for 30 min under a power of 15 kW, the heating power is turned off, the alloy melt cast by a smelting crucible is started to be received, the high-temperature melt is atomized and broken by using 99.9% high-purity argon, a boron nitride flow guide pipe with an inner diameter of 4 mm, and a gas pressure of 4.0 MPa;

[0089] The AlCoCrFeNi 2.1 high-entropy alloy powder is obtained by screening;

[0090] Secondly, the 15-53 μm interval section pre-alloy powder obtained by screening is placed in a vacuum oven, the cabin door is closed, the pressure in the oven is vacuumized to 10 -1 Pa by using a vacuum pump, and then the oven is heated to 80℃ and kept for 3 h to remove the residual moisture in the pre-alloy powder;

[0091] Thirdly, 3% of 50 nm RE3TaO7 particles are put into the stainless steel ball mill tank together with 3 kg of the pretreated 15-53 μm high-entropy alloy powder, the ball-to-material ratio is 5:1, the vacuum is extracted to 10 -1 Pa after the cover is closed, micro-positive pressure argon is introduced, the rotation speed is 150 rpm, the intermittent ratio is 5:1, and the 24 h ball milling powder mixing treatment is performed;

[0092] Finally, the ball milling powder raw material is used to separate the powder material from the grinding balls by using a screen to obtain the RE3TaO7 nanoparticle mixed high-entropy alloy composite powder;

[0093] S2, dispersion micropore / oxide reinforced AlCoCrFeNi 2.1 high-entropy alloy adhesive layer preparation:

[0094] dispersion micropore adhesive layer bottom preparation: the diamond micro-powder mixed high-entropy alloy composite powder is melted and covered on the surface of the surface polished GH4169 cylinder (Φ60 mm) by using a high-speed laser cladding technology;

[0095] The preferred high-speed laser cladding process is: the cladding line speed is 25 m / min, the laser power is 1.8 kW, and the powder feeding flow is 20 g / min;

[0096] The thickness of the dispersion micropore adhesive layer bottom prepared by the preferred high-speed cladding process is 150 μm;

[0097] oxide dispersion reinforced adhesive layer top preparation: the oxide dispersion reinforced composite powder is melted and covered on the dispersion micropore adhesive layer bottom by using a high-speed laser cladding technology to obtain;

[0098] The RE3TaO7 nanoparticle mixed high-entropy alloy composite powder is melted and covered on the surface of the dispersion micropore adhesive layer bottom by using a high-speed laser cladding technology;

[0099] The preferred high-speed laser cladding process is: cladding line speed 50 m / min, laser power 2.8 kW, powder feeding flow 35 g / min;

[0100] The thickness of the top layer of the oxide dispersion strengthened adhesive layer is 30 μm;

[0101] S3, high-entropy alloy adhesive layer pretreatment:

[0102] A heat treatment: the prepared dispersion microporous / oxide reinforced AlCoCrFeNi 2.1 The high-entropy alloy adhesive layer sample is placed in a muffle furnace, and the furnace is heated from room temperature and then taken out for air cooling treatment after heat preservation;

[0103] By preparing the dispersion microporous / oxide reinforced AlCoCrFeNi 2.1 The high-entropy alloy adhesive layer sample is placed in a muffle furnace, and the furnace is heated from room temperature and then taken out for air cooling treatment after heat preservation at a heating rate of 5 ℃ / min and heat preservation at 1050 ℃ for 1.0 h;

[0104] Surface laser remelting treatment: high-speed laser cladding is used to slightly melt the surface of the coating, reduce the surface roughness, and realize the spraying of the ceramic thermal barrier layer thereon.

[0105] By high-speed laser cladding equipment, the surface of the heat treated coating is laser surface remelted to realize better combination with the ceramic thermal barrier layer;

[0106] The optimized surface remelting process is: laser power is 0.5 kW, line speed is 35 m / min, and lap rate is 60%.

[0107] In this embodiment, the hardness of the dispersion microporous adhesive layer bottom layer before the high-entropy alloy adhesive layer pretreatment is 270 HV, the porosity is 4%, and the oxidation weight gain after 1100 ℃ high temperature heat preservation for 200 h is 3.5 mg / cm 2 , AlCoCrFeNi 2.1 The adhesion between the high-entropy alloy bottom layer and the substrate is 290 MPa.

[0108] In this embodiment, the hardness of the RE3TaO7 nano-oxide particle dispersion strengthened AlCoCrFeNi 2.1 High-entropy alloy top layer before high-entropy alloy adhesive layer pretreatment is 330 HV, porosity is 0.3%, and oxidation weight gain after 1100 ℃ high temperature heat preservation for 200 h is 0.5 mg / cm 2 , AlCoCrFeNi 2.1 The adhesion between the high-entropy alloy top layer and the bottom layer is 270 MPa.

[0109] In this embodiment, the high-entropy alloy adhesive layer is pretreated with RE3TaO7 nano-oxide particles dispersed in AlCoCrFeNi 2.1 The hardness of the high-entropy alloy top layer is 390 HV, the porosity is 0.3%, and the oxidation weight gain after 200 h of high-temperature holding at 1100℃ is 0.4 mg / cm 2 , AlCoCrFeNi 2.1 The adhesion between the high-entropy alloy top layer and the bottom layer is 270 MPa.

[0110] In this embodiment, the high-entropy alloy adhesive layer is pretreated with RE3TaO7 nano-oxide particles dispersed in AlCoCrFeNi 2.1 A 100 μm YSZ ceramic thermal barrier layer is sprayed on the high-entropy alloy top layer. The surface morphology after 100 cycles of cyclic oxidation at 1200℃ is shown in Figure 4 The surface YSZ ceramic layer of the high-entropy alloy top layer is basically unchanged after cyclic oxidation.

[0111] After 100 cycles of cyclic oxidation at 1200℃, the experimental results show that the YSZ thermal barrier layer on the surface of the adhesive layer prepared in this embodiment is basically unchanged.

[0112] Comparative Example 1

[0113] In this comparative embodiment, an AlCoCrFeNi 2.1 The high-entropy alloy adhesive layer is processed as follows: 2.1 The high-entropy alloy adhesive layer is processed as follows:

[0114] S1, AlCoCrFeNi 2.1 High-entropy alloy powder preparation:

[0115] First, Al, Co, Cr, Fe and Ni block materials with a purity higher than 99.9% are selected, and 50 kg of mixed raw materials are weighed according to the ratio of 38.88%-Ni, 18.59%-Co, 17.62% Fe, 16.40%-Cr and 8.51%-Al. The mixed materials are alloyed and atomized into spherical pre-alloy powder materials using the preferred vacuum induction melting gas atomization powdering process, and the pre-alloy powder in the interval of 15-53 μm is obtained by using a wind selection device for screening.

[0116] The preferred vacuum induction melting gas atomization powdering process is divided into an alloying melting process and a high-temperature melt atomization process.

[0117] The alloying melting process is as follows: after closing the melting chamber door, vacuum is first extracted to 10 -1After Pa, 99.9% high-purity argon gas is introduced to 10 kPa pressure, and the mixed raw materials are further heated to 1500 DEG C under the induction heating power of 250 kW, and then the temperature is maintained for 15 min, and the pouring is started;

[0118] The high-temperature melt atomization process is that the holding crucible is heated for 30 min under the power of 15 kW, the heating power is turned off, the alloy melt poured from the smelting crucible is started to be received, the high-temperature melt is atomized and broken by using 99.9% high-purity argon gas, a boron nitride flow guide pipe with an inner diameter of 4 mm, and a gas pressure of 4.0 MPa;

[0119] The AlCoCrFeNi 2.1 high-entropy alloy powder is obtained by re-screening;

[0120] Secondly, the 15-53 mu interval section of the pre-alloy powder obtained by screening is placed in a vacuum oven, the cabin door is closed, the pressure in the oven is vacuumized to 10 -1 Pa by using a vacuum pump, and then the oven is heated to 80 DEG C and maintained for 3 h to remove the residual moisture in the pre-alloy powder;

[0121] Finally, the RAlCoCrFeNi2.1 high-entropy alloy powder is obtained;

[0122] S2, AlCoCrFeNi 2.1 high-entropy alloy adhesive layer preparation:

[0123] By using the high-speed laser cladding technology, the AlCoCrFeNi 2.1 high-entropy alloy powder is cladded on the surface of the surface-polished GH4169 cylinder (Φ200 mm);

[0124] The preferred high-speed laser cladding process is that the cladding line speed is 15 m / min, the laser power is 1.8 kW, and the powder feeding flow is 35 g / min;

[0125] The thickness of the oxide dispersion strengthened adhesive layer is 300 mu;

[0126] S3, high-entropy alloy adhesive layer pretreatment:

[0127] A kind of heat treatment: the prepared AlCoCrFeNi 2.1 high-entropy alloy adhesive layer sample is placed in a muffle furnace, and the furnace is heated from room temperature and then taken out for air cooling treatment after maintaining;

[0128] By using the prepared AlCoCrFeNi 2.1 high-entropy alloy adhesive layer sample is placed in a muffle furnace, and the furnace is heated from room temperature to 1050 DEG C at a heating rate of 10 DEG C / min and then taken out for air cooling treatment after maintaining for 0.5 h;

[0129] Surface laser remelting treatment: high-speed laser cladding is used to micro-melt the surface of the coating, reduce the surface roughness, and realize the spraying of the ceramic thermal barrier layer thereon.

[0130] By means of high-speed laser cladding equipment, the surface of the heat-treated coating is micro-re-melted by laser to realize better combination with the ceramic thermal barrier layer.

[0131] The optimized surface laser remelting process is that the laser power is 1.0 kW, the line speed is 45 m / min, and the overlap rate is 60%.

[0132] In this embodiment, the AlCoCrFeNi 2.1 The hardness of the high-entropy alloy layer is 320 HV, the porosity is 0.3%, and the oxidation weight gain after 200 h of high-temperature holding at 1100°C is 1.0 mg / cm 2 , AlCoCrFeNi 2.1 The adhesion between the high-entropy alloy top layer and the substrate is 300 MPa.

[0133] In this embodiment, the AlCoCrFeNi 2.1 The hardness of the high-entropy alloy layer is 350 HV, the porosity is 0.3%, and the oxidation weight gain after 200 h of high-temperature holding at 1100°C is 0.8 mg / cm 2 , AlCoCrFeNi 2.1 The adhesion between the high-entropy alloy top layer and the substrate is 300 MPa.

[0134] On the AlCoCrFeNi 2.1 High-entropy alloy top layer after pretreatment of high-entropy alloy bonding layer, 200 μm YSZ ceramic ceramic thermal barrier layer is sprayed. The surface morphology after 100 times of cyclic oxidation at 1200°C is shown in Figure 5 , and the surface YSZ ceramic layer after cyclic oxidation is obviously peeled off.

[0135] After 100 times of cyclic oxidation at 1200°C, the experimental results show that the YSZ thermal barrier layer on the surface of the bonding layer prepared in this embodiment is obviously peeled off.

[0136] Example 2

[0137] In this embodiment, a dispersion micropore / oxide reinforced AlCoCrFeNi 2.1 High-entropy alloy bonding layer, the dispersion micropore / oxide reinforced AlCoCrFeNi 2.1 High-entropy alloy bonding layer is processed by the following steps:

[0138] S1, preparation of oxide nanoparticle mixed high-entropy alloy composite powder:

[0139] RE3TaO7 nano-oxide particle dispersion strengthened composite powder preparation:

[0140] First, the purity of more than 99.9% Al, Co, Cr, Fe and Ni block material, according to the ratio of 38.88%-Ni, 18.59%-Co, 17.62% Fe, 16.40%-Cr and 8.51%-Al, 50kg mixed raw materials, using the preferred vacuum induction melting gas atomization powder technology, alloying and atomizing into spherical pre-alloy powder material, and then using the air separation equipment to obtain 15-53μm interval pre-alloy powder;

[0141] Among them, the preferred vacuum induction melting gas atomization powder technology is divided into alloying melting process and high temperature melt atomization process;

[0142] The alloying melting process is: after closing the melting chamber door, first vacuum to 10 -1 Pa, then 99.9% high-purity argon is introduced to 10kPa pressure, and further using the melting crucible is heated to 1490℃ under the induction heating power of 250kW, and then the mixed raw materials are heated to 1490℃ and kept for 18min, and then the casting is started;

[0143] The high temperature melt atomization process is: after the heat preservation crucible is heated for 30min under the power of 15kW, the heating power is turned off, and the alloy melt of the melting crucible is started to be received, and the high-purity argon of 99.9% is used to atomize and break the high-temperature melt under the gas pressure of 4.0MPa through the 4mm inner diameter boron nitride flow guide pipe;

[0144] Then, the 15-53μm interval AlCoCrFeNi 2.1 high-entropy alloy powder is obtained by screening;

[0145] Secondly, the 15-53μm interval pre-alloy powder obtained by screening is placed in a vacuum oven, the door is closed, the pressure in the oven is vacuumed to 10 -1 Pa by using a vacuum pump, and then the oven is heated to 80℃ and kept for 3h to remove the residual moisture in the pre-alloy powder;

[0146] Thirdly, 5% of 50nm RE3TaO7 particles and 3kg of pretreated 15-53μm high-entropy alloy powder are put into a stainless steel ball mill tank, the ball-to-material ratio is 5:1, the door is closed after vacuuming to 10 -1 Pa, then a micro-positive pressure of argon is introduced, and the intermittent ratio is 5:1 at a speed of 150rmp for 24h ball milling powder treatment;

[0147] Finally, the ball-milled powder material is separated from the milling balls by using a screen to obtain a high-entropy alloy composite powder mixed with RE3TaO7 nanoparticles;

[0148] S2, dispersion micropore / oxide reinforced AlCoCrFeNi 2.1 High-entropy alloy adhesive layer preparation:

[0149] Dispersion micropore adhesive layer bottom preparation: a high-speed laser cladding technology is used to clad the high-entropy alloy composite powder mixed with diamond powder on the surface of the surface-polished GH4169 cylinder (Φ200 mm);

[0150] The preferred high-speed laser cladding process is: cladding line speed 25 m / min, laser power 2.1 kW, powder feeding flow 25 g / min;

[0151] The thickness of the dispersion micropore adhesive layer bottom prepared by the preferred high-speed cladding process is 200 μm;

[0152] Oxide dispersion reinforced adhesive layer top preparation: a high-speed laser cladding technology is used to clad the oxide dispersion reinforced composite powder on the dispersion micropore adhesive layer bottom to obtain;

[0153] A high-speed laser cladding technology is used to clad the high-entropy alloy composite powder mixed with RE3TaO7 nanoparticles on the surface of the dispersion micropore adhesive layer bottom;

[0154] The preferred high-speed laser cladding process is: cladding line speed 35 m / min, laser power 1.5 kW, powder feeding flow 45 g / min;

[0155] The thickness of the oxide dispersion reinforced adhesive layer top is 40 μm;

[0156] S3, high-entropy alloy adhesive layer pretreatment:

[0157] A heat treatment: the prepared dispersion micropore / oxide reinforced AlCoCrFeNi 2.1 The high-entropy alloy adhesive layer sample is placed in a muffle furnace, and after heating and holding at room temperature, it is taken out for air cooling treatment;

[0158] The prepared dispersion micropore / oxide reinforced AlCoCrFeNi 2.1 The high-entropy alloy adhesive layer sample is placed in a muffle furnace, and according to a heating rate of 10℃ / min, it is heated from room temperature to 1050℃ and held for 0.5 h, and then taken out for air cooling treatment;

[0159] Surface laser remelting treatment: a high-speed laser cladding is used to slightly melt the surface of the coating to reduce the surface roughness, so as to realize the spraying of a ceramic thermal barrier layer thereon.

[0160] The surface of the heat-treated coating is micro-re-melted by a high-speed laser cladding device to realize better combination with the ceramic thermal barrier layer.

[0161] The optimized surface re-melting process is as follows: laser power is 1.0 kW, linear velocity is 45 m / min, and overlap rate is 60%.

[0162] In this embodiment, the hardness of the dispersed microporous adhesive layer of the high-entropy alloy adhesive layer before pretreatment is 260 HV, the porosity is 6%, and the oxidation weight gain after 200 h of high-temperature holding at 1100 DEG C is 4.0 mg / cm 2 , AlCoCrFeNi 2.1 The adhesion between the high-entropy alloy bottom layer and the substrate is 300 MPa.

[0163] In this embodiment, the RE3TaO7 nano-oxide particle dispersion strengthened AlCoCrFeNi 2.1 The hardness of the high-entropy alloy top layer is 330 HV, the porosity is 0.4%, and the oxidation weight gain after 200 h of high-temperature holding at 1100 DEG C is 0.6 mg / cm 2 , AlCoCrFeNi 2.1 The adhesion between the high-entropy alloy top layer and the bottom layer is 310 MPa.

[0164] In this embodiment, the RE3TaO7 nano-oxide particle dispersion strengthened AlCoCrFeNi 2.1 The hardness of the high-entropy alloy top layer is 400 HV, the porosity is 0.5%, and the oxidation weight gain after 200 h of high-temperature holding at 1100 DEG C is 0.3 mg / cm 2 , AlCoCrFeNi 2.1 The adhesion between the high-entropy alloy top layer and the bottom layer is 310 MPa.

[0165] In this embodiment, the RE3TaO7 nano-oxide particle dispersion strengthened AlCoCrFeNi 2.1 A 100-micron YSZ ceramic thermal barrier layer is sprayed on the high-entropy alloy top layer after pretreatment. The surface morphology after 100 cycles of oxidation at 1200 DEG C is shown in Figure 6 , and the surface YSZ ceramic layer after cyclic oxidation has not changed.

[0166] According to the experimental results after 100 cycles of oxidation at 1200 DEG C, the YSZ thermal barrier layer on the surface of the adhesive layer prepared in this embodiment has not changed.

[0167] Example 3

[0168] The dispersed microporous / oxide reinforced AlCoCrFeNi2.1 A processing procedure of high-entropy alloy adhesive layer, the dispersion micropore / oxide reinforced AlCoCrFeNi 2.1 The processing procedure of high-entropy alloy adhesive layer comprises the following steps:

[0169] S1, preparation of oxide nanoparticle mixed high-entropy alloy composite powder:

[0170] Preparation of RE3TaO7 nano-oxide particle dispersion strengthened composite powder:

[0171] Firstly, Al, Co, Cr, Fe and Ni block materials with purity higher than 99.99% are screened, 100 kg of mixed raw materials are weighed according to the proportion of 38.88%-Ni, 18.59%-Co, 17.62% Fe, 16.40%-Cr and 8.51%-Al, and the mixed materials are alloyed and atomized into spherical pre-alloy powder materials by using the preferred vacuum induction melting gas atomization powder preparation process, and the pre-alloy powder in the interval of 15-53 μm is obtained by using the air separation equipment for screening;

[0172] The preferred vacuum induction melting gas atomization powder preparation process comprises an alloying melting process and a high-temperature melt atomization process.

[0173] The alloying melting process is as follows: after closing the melting chamber door, the vacuum is first extracted to 0.5 Pa, then 99.9% high-purity argon gas is introduced to a pressure of 13 kPa, the mixed raw materials are heated to 1500 ℃ under the induction heating power of 250 kW, and then the temperature is maintained for 15 min, and the pouring is started;

[0174] The high-temperature melt atomization process is as follows: after the holding crucible is heated for 35 min under the power of 14 kW, the heating power is turned off, the alloy melt poured from the melting crucible is received, the high-purity argon gas with a purity of 99.9% is used, the boron nitride flow guide pipe with an inner diameter of 4.5 mm is used, and the high-temperature melt is atomized and broken under the gas pressure of 4.0 MPa;

[0175] The pre-alloy powder in the interval of 15-53 μm is screened again to obtain AlCoCrFeNi 2.1 High-entropy alloy powder;

[0176] Secondly, the pre-alloy powder in the interval of 15-53 μm obtained by screening is placed in a vacuum oven, the cabin door is closed, the pressure in the oven is extracted to 10 -1 Pa by using a vacuum pump, the oven is heated to 80 ℃ and maintained for 3 h, and the residual moisture in the pre-alloy powder is removed;

[0177] Thirdly, 50 nm RE3TaO7 particles with a mass ratio of 3% are put into a stainless steel ball mill tank together with 2 kg of pretreated 15-53 μm high-entropy alloy powder, the ball-to-material ratio is 5:1, the vacuum is extracted to 10-1 Pa, and then the micro-positive pressure argon was introduced again, the ball milling was carried out for 28 h at a rotating speed of 120 rpm and an intermittent ratio of 5:1;

[0178] Finally, the ball-milled powder material was separated from the milling balls by using a screen to obtain the RE3TaO7 nanoparticle mixed high-entropy alloy composite powder;

[0179] S2, dispersion micropore / oxide reinforced AlCoCrFeNi 2.1 Preparation of high-entropy alloy adhesive layer:

[0180] Preparation of dispersion micropore adhesive layer bottom layer: the diamond powder mixed high-entropy alloy composite powder was cladded on the surface of the surface-polished GH4169 cylinder (Φ200 mm) by high-speed laser cladding technology;

[0181] The preferred high-speed laser cladding process is: cladding line speed 20 m / min, laser power 1.8 kW, powder feeding flow 22 g / min;

[0182] The thickness of the dispersion micropore adhesive layer bottom layer prepared by the preferred high-speed cladding process is 150 μm;

[0183] Preparation of oxide dispersion reinforced adhesive layer top layer: the oxide dispersion reinforced composite powder was cladded on the dispersion micropore adhesive layer bottom layer by high-speed laser cladding technology to obtain the oxide dispersion reinforced adhesive layer top layer;

[0184] The RE3TaO7 nanoparticle mixed high-entropy alloy composite powder was cladded on the surface of the dispersion micropore adhesive layer bottom layer by high-speed laser cladding technology;

[0185] The preferred high-speed laser cladding process is: cladding line speed 30 m / min, laser power 2.2 kW, powder feeding flow 40 g / min;

[0186] The thickness of the oxide dispersion reinforced adhesive layer top layer is 35 μm;

[0187] S3, high-entropy alloy adhesive layer pretreatment:

[0188] A kind of heat treatment: the dispersion micropore / oxide reinforced AlCoCrFeNi 2.1 The high-entropy alloy adhesive layer sample was placed in a muffle furnace, and was taken out after being heated and kept at room temperature;

[0189] The dispersion micropore / oxide reinforced AlCoCrFeNi 2.1 The high-entropy alloy adhesive layer sample was placed in a muffle furnace, and was taken out after being heated and kept at room temperature;

[0190] Surface laser remelting treatment: high-speed laser cladding is used to micro-melt the surface of the coating, so as to reduce the surface roughness and realize the spraying of the ceramic thermal barrier layer thereon.

[0191] By means of high-speed laser cladding equipment, the surface of the heat-treated coating is micro-re-melted by laser to realize better combination with the ceramic thermal barrier layer.

[0192] The optimized surface laser remelting process is that the laser power is 0.85 kW, the linear velocity is 40 m / min, and the overlap rate is 60%.

[0193] In this embodiment, the hardness of the dispersed microporous adhesive layer of the high-entropy alloy adhesive layer before pretreatment is 280 HV, the porosity is 4%, and the oxidation weight gain after 1100 DEG C high-temperature holding for 200 h is 3.0 mg / cm 2 , AlCoCrFeNi 2.1 The adhesion between the high-entropy alloy bottom layer and the substrate is 275 MPa.

[0194] In this embodiment, the RE3TaO7 nano-oxide particle dispersion strengthened AlCoCrFeNi 2.1 The hardness of the high-entropy alloy top layer is 330 HV, the porosity is 0.5%, and the oxidation weight gain after 1100 DEG C high-temperature holding for 200 h is 0.6 mg / cm 2 , AlCoCrFeNi 2.1 The adhesion between the high-entropy alloy top layer and the bottom layer is 310 MPa.

[0195] In this embodiment, the RE3TaO7 nano-oxide particle dispersion strengthened AlCoCrFeNi 2.1 The hardness of the high-entropy alloy top layer is 390 HV, the porosity is 0.38%, and the oxidation weight gain after 1100 DEG C high-temperature holding for 200 h is 0.35 mg / cm 2 , AlCoCrFeNi 2.1 The adhesion between the high-entropy alloy top layer and the bottom layer is 280 MPa.

[0196] In this embodiment, the RE3TaO7 nano-oxide particle dispersion strengthened AlCoCrFeNi 2.1 The YSZ ceramic thermal barrier layer of 150 microns is sprayed on the high-entropy alloy top layer. The surface morphology after 120 times of cyclic oxidation at 1200 DEG C is shown in Figure 7 , and the surface YSZ ceramic layer after cyclic oxidation is basically unchanged.

[0197] According to the experimental results after 120 times of cyclic oxidation at 1200 DEG C, the YSZ thermal barrier layer on the surface of the adhesive layer prepared in this embodiment is basically unchanged.

[0198] The scheme, the application provides a dispersion micropore / oxide reinforced AlCoCrFeNi 2.1 The processing technology of the high-entropy alloy adhesive layer can solve the problem of rapid peeling of the top ceramic layer caused by the internal stress of the dense microstructure during the service process of the high-entropy alloy adhesive layer. 2.1 The high-entropy alloy adhesive layer has a dense microstructure, so that the internal stress cannot be released during the service process, and the problem of rapid peeling of the top ceramic layer is caused.

[0199] The application can make the AlCoCrFeNi 2.1 The top of the high-entropy alloy coating has excellent oxidation resistance; at the same time, the AlCoCrFeNi 2.1 The bottom of the high-entropy alloy layer provides sufficient stress release space for the cyclic oxidation process, and avoids the peeling of the YSZ ceramic top layer caused by the thermal expansion mismatch stress.

[0200] The application can make the metal adhesive layer have the dense microstructure characteristics to ensure excellent oxidation resistance, and the porous coating top ensures stress release during the oxidation process, thereby avoiding the peeling of the YSZ ceramic top layer.

[0201] The application can make the AlCoCrFeNi 2.1 The top of the high-entropy alloy coating has a finer grain size, which further improves the oxidation resistance of the top layer; at the same time, the laser surface remelting optimizes the surface roughness of the high-speed cladding coating, and improves the bonding performance of the YSZ coating and the metal adhesive layer.

[0202] The preparation method has simple process, high controllability, good operability, low energy consumption, controllable cost, meets environmental protection requirements, has no pollutant emission, and has the potential for industrial application.

[0203] In summary, compared with other traditional methods, the method of the application can make the AlCoCrFeNi 2.1 The preparation of the high-entropy alloy adhesive layer and the pretreatment of the high-entropy alloy adhesive layer can obtain the adhesive layer, and the prepared adhesive layer will not obviously peel off the surface ceramic thermal insulation layer after high-temperature thermal cycle oxidation; the preparation method has simple process, high controllability, good operability, low energy consumption, controllable cost, environmental protection and no pollution, and is beneficial to industrial large-scale production and promotion.

[0204] It should be understood that the term "and / or" in this document is only used to describe the association relationship of the associated objects, which means that there can be three relationships, for example, A and / or B, which can represent the following three cases: A exists alone, A and B exist together, and B exists alone, where A and B can be singular or plural. In addition, the character " / " in this document generally represents an "or" relationship between the associated objects before and after it, but it can also represent an "and / or" relationship, which can be understood in the context before and after it.

[0205] In this application, "at least one" means one or more, and "multiple" means two or more. "At least one of the following" or the like means any combination of these items, including any combination of single or multiple items. For example, at least one of a, b, or c can mean a, b, c, a-b, a-c, b-c, or a-b-c, where a, b, and c can be single or multiple.

[0206] It should be understood that in various embodiments of the present application, the size of the sequence number of the above-mentioned processes does not mean the order of execution, and the execution order of the processes should be determined according to its function and inherent logic, and should not constitute any limitation on the implementation process of the embodiments of the present application.

[0207] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto, and any person skilled in the art can easily think of changes or replacements within the technical scope disclosed by the present application, which should be covered within the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. A dispersed microporous / oxide-reinforced AlCoCrFeNi 2.1 The processing technology of the high-entropy alloy adhesive layer, wherein the dispersed micropore / oxide-reinforced AlCoCrFeNi 2.1 The processing steps for the high-entropy alloy adhesive layer are as follows: Preparation of high-entropy alloy composite powder containing S1 oxide nanoparticles: Preparation of RE3TaO7 nano-oxide particle dispersion-reinforced composite powder: The powder was prepared by ball milling in AlCoCrFeNi... 2.1 RE3TaO7 nano-oxide particles were doped into high-entropy alloy spherical pre-alloyed powder and prepared by high-entropy alloy spherical pre-alloyed powder pretreatment, ball milling and mixing, and sieving under an argon protective atmosphere. Preparation of diamond micron powder dispersion-reinforced composite powder: Diamond micron powder was added to AlCoCrFeNi using a ball milling method. 2.1 It is prepared by ball milling and sieving in high-entropy alloy pre-alloyed powder under an argon protective atmosphere; S2, Dispersed micropores / oxide-reinforced AlCoCrFeNi 2.1 Preparation of high-entropy alloy adhesive layer: Preparation of the bottom layer of the dispersed microporous adhesive layer: The bottom layer of the dispersed microporous adhesive layer was prepared by high-speed laser cladding technology, which was used to clad diamond micropowder dispersion-reinforced composite powder on GH4169 substrate. Preparation of the top layer of the oxide dispersion-reinforced adhesive layer: The top layer of the adhesive layer is prepared by fusing oxide dispersion-reinforced composite powder onto the bottom layer of the dispersion microporous adhesive layer using high-speed laser cladding technology. S3. Pretreatment of high-entropy alloy adhesive layer: A heat treatment: strengthening AlCoCrFeNi with prepared dispersed microporous / oxide material 2.1 The high-entropy alloy bonding layer sample was placed in a muffle furnace, heated from room temperature and held at that temperature before being taken out and air-cooled. Surface laser remelting treatment: High-speed laser cladding is used to micro-melt the coating surface, reduce the surface roughness, and enable the spraying of a ceramic heat insulation layer on it.

2. The dispersed microporous / oxide-reinforced AlCoCrFeNi according to claim 1 2.1 The processing technology of the high-entropy alloy adhesive layer is characterized by, S1 AlCoCrFeNi 2.1 The high-entropy alloy spherical pre-alloyed powder was prepared and sieved by vacuum induction melting gas atomization method; the vacuum induction melting gas atomization powder preparation process is as follows: the atomizing gas is argon, the atomization pressure is 4MPa, and the melting temperature is 1490-1500℃.

3. The dispersed microporous / oxide-reinforced AlCoCrFeNi according to claim 1 2.1 The processing technology of the high-entropy alloy adhesive layer is characterized by, S1 AlCoCrFeNi 2.1 The pretreatment of high-entropy alloy spherical pre-alloyed powder involves placing the 15-53 μm pre-alloyed powder obtained by sieving into a vacuum oven, closing the door, and using a vacuum pump to evacuate the pressure inside the oven to 10. -1 Pa, then heat the oven to 80℃ and keep it at that temperature for 3 hours to remove residual moisture from the pre-alloyed powder.

4. The dispersed microporous / oxide-reinforced AlCoCrFeNi according to claim 1 2.1 The processing technology of the high-entropy alloy adhesive layer is characterized by, Preparation of S1 RE3TaO7 nano-oxide particle dispersion-reinforced composite powder, AlCoCrFeNi 2.1 The high-entropy alloy spherical pre-alloyed powder has a size of 15-53μm, and the doping amount of RE3TaO7 nano-oxide particles is 1-5%. The spherical-to-grind powder mixing process is carried out in an argon-protected atmosphere at a rotation speed of 100-150rpm, an intermittent ratio of 5:1, and a ball-to-material ratio of 5:

1. Both the grinding jar and the grinding balls are made of stainless steel.

5. The dispersed microporous / oxide-reinforced AlCoCrFeNi according to claim 1 2.1 The processing technology of the high-entropy alloy adhesive layer is characterized by, Preparation of diamond micron powder dispersion-reinforced composite powder in S1, AlCoCrFeNi 2.1 The high-entropy alloy pre-alloyed powder has a size of 15-53μm, and the addition amount of 5-10μm diamond micro powder is 5-10%. The ductile iron powder mixing process is carried out in an argon-protected atmosphere using a rotation speed of 150-250rpm, an intermittent ratio of 10:1, and a ball-to-material ratio of 8:

1. Both the grinding jar and the grinding balls are made of stainless steel.

6. The dispersed microporous / oxide-reinforced AlCoCrFeNi according to claim 1 2.1 The processing technology of the high-entropy alloy adhesive layer is characterized by, The sieving process in S1 involves ball milling and mixing the raw materials, then using a sieve to separate the powder material from the grinding balls to obtain a high-entropy alloy composite powder containing RE3TaO7 nanoparticles.

7. The dispersed microporous / oxide-reinforced AlCoCrFeNi according to claim 1 2.1 The processing technology of the high-entropy alloy adhesive layer is characterized by, In the preparation of the bottom layer of the dispersed microporous adhesive layer in S2, during the molten pool metallurgical process, diamond micropowder will undergo the following reaction: C + ½O2 → CO △G ○ =-275kJ / mol (T=1600℃); CO+½O2→CO2 △G ○ =-120kJ / mol (T=1600℃), forming a large amount of gaseous CO and CO2, resulting in a dispersed microporous AlCoCrFeNi with a large number of pores. 2.1 High-entropy alloy composite coating; coating thickness in the range of 50-200μm, cladding linear velocity in the range of 15-25m / min, laser power in the range of 1.5-2.1kW, and powder feed rate in the range of 20-25g / min.

8. The dispersed microporous / oxide-reinforced AlCoCrFeNi according to claim 1 2.1 The processing technology of the high-entropy alloy adhesive layer is characterized by, S2 employs high-speed laser cladding technology with a cladding linear velocity ranging from 35-50 m / min, a cladding power ranging from 1.5-2.8 kW, and a powder feed rate ranging from 35-45 g / min. This process involves cladding oxide dispersion-reinforced composite powder onto a dispersed microporous adhesive layer, preparing AlCoCrFeNi composites with a thickness of 30-40 μm and dispersion-reinforced by RE3TaO7 nano-oxide particles. 2.1 The top layer of the high-entropy alloy.

9. The dispersed microporous / oxide-reinforced AlCoCrFeNi according to claim 1 2.1 The processing technology of the high-entropy alloy adhesive layer is characterized by, In S3, the heating rate of one type of heat treatment is 5-10℃ / min. The furnace is heated from room temperature to 1050℃ and held for 0.5-1.0h before being taken out and air-cooled.

10. The dispersed microporous / oxide-reinforced AlCoCrFeNi according to claim 1 2.1 The processing technology of the high-entropy alloy adhesive layer is characterized by, The surface laser remelting process in S3 is as follows: laser power in the range of 0.5-1.0kW, and linear speed in the range of 35-45m / min.

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