High-temperature corrosion-resistant nickel alloy spraying material and preparation method thereof

Abstract

The invention belongs to the field of metal material processing, and particularly relates to a high-temperature corrosion-resistant nickel alloy spraying material and a preparation method thereof. The spraying material comprises an inner layer material and an outer layer material, the inner-layer material and the outer-layer material are matched for use; the inner layer material comprises a mixture of a component A and a component B; the outer layer material comprises a mixture of a component A and a component B; the component A is a ceramic material; and the component B is nickel-chromium-based powder. The composite coating prepared by compounding a high-temperature ceramic material and a Ni / Cr alloy material according to different proportions and then carrying out secondary coating by using a plasma spraying method has excellent bonding strength and high-temperature corrosion resistance; the method is simple and efficient to operate and suitable for industrial production.

Description

Technical Field

[0001] The present invention belongs to the field of metal materials, and particularly relates to a high-temperature corrosion-resistant nickel alloy spraying material and a preparation method thereof. Background Art

[0002] The problems of wear and corrosion of metal materials are issues that cannot be ignored in the current field of materials science and engineering. Nickel-based superalloys are rare alloy materials that can simultaneously take into account the strength and plasticity of alloy materials, and have extremely excellent high-temperature resistance, oxidation resistance, and corrosion resistance. However, nickel-based superalloys also have obvious defects: such as easy oxidation corrosion at high temperatures, poor wear resistance, etc., resulting in deformation and failure. Research on the failure of metal materials caused by wear, corrosion, etc. shows that most of these failures occur on the surface of the materials, thus seriously affecting the service life of the materials. Therefore, to improve the wear resistance and corrosion resistance of metal materials, mainly to improve the surface properties of metal materials.

[0003] Ceramic coatings have the performance characteristics of wear resistance, corrosion resistance, and high-temperature oxidation resistance, and are widely used in many fields such as aerospace, mechanical engineering, and chemical engineering. However, their corrosion resistance is for corrosion or erosion in conventional chemical environments, but their corrosion resistance performance is not excellent in strong acid environments. While Ni / Cr alloy coatings can exhibit excellent corrosion resistance characteristics in strong acid environments, their wear resistance and high-temperature oxidation resistance are not as good as ceramic coatings. Therefore, the corrosion resistance of the coating in strong acid environments can be increased by adding Ni / Cr to the ceramic coating, and at the same time, the bonding strength of the coating can be improved.

[0004] Conventional operating means use Ni / Cr alloy coatings as the inner layer to increase the bonding force between the ceramic coating and the nickel alloy substrate, which can effectively improve the bonding force of the ceramic coating, but there is no obvious improvement in the mechanical properties of the coating, and it does not play a role in enhancing the corrosion resistance of the alumina coating; if the ceramic coating is used as the inner layer structure and the Ni / Cr alloy coating is used as the outer layer structure, there is also a problem of reduced bonding strength. For this reason, some scientific research workers use the supersonic spraying method instead of the conventional plasma spraying method, which can effectively solve the problem of the bonding strength between the ceramic coating and the nickel alloy substrate, and for pure ceramic coatings, their porosity is low, and the coating structure is dense and crack-free. However, the process cost of supersonic spraying is high, which is suitable for high-tech fields such as aerospace, and is not suitable for the surface modification of ordinary mechanical materials.

[0005] In addition, ceramic materials also have high ceramic processing costs, are not conducive to fine grinding, and the high melting point of ceramics also makes the porosity of their coatings higher than that of metal coatings, and abrasive particles and carbon black are easily embedded in the coating pores; moreover, the high hardness of ceramic abrasive grains will, to a certain extent, exacerbate the wear of the materials. Summary of the Invention

[0006] The object of the present invention is to provide a novel high-temperature corrosion-resistant nickel alloy spraying material and its preparation method in view of the problems of low bonding strength and poor high-temperature corrosion resistance of the existing high-temperature corrosion-resistant nickel alloy spraying materials. After compounding high-temperature ceramic materials and Ni / Cr alloy materials in different proportions and then using the plasma spraying method for secondary coating, the obtained composite coating has excellent bonding strength and high-temperature corrosion resistance; at the same time, the operation is simple and efficient, which is suitable for industrial production.

[0007] To achieve the above object, the technical solution adopted by the present invention to solve its technical problems is as follows:

[0008] A high-temperature corrosion-resistant nickel alloy spraying material, comprising an inner layer material and an outer layer material; the inner layer material and the outer layer material are used in combination; the inner layer material comprises a mixture of component A and component B; the outer layer material comprises a mixture of component A and component B; the component A is a ceramic material; the component B is a nickel-chromium-based powder.

[0009] Preferably, the ceramic material is selected from one or more of alumina, zirconia, molybdenum boride, and chromium boride.

[0010] Preferably, the nickel-chromium-based powder comprises the following raw materials in parts by weight:

[0011] Cr: 30.0 - 35.0%, Ti: 0.6 - 3.0%, Al: 3.0 - 5.0%, Fe: 0.3 - 0.5%, Nb: 1.0 - 3.0%, Mn: <0.2%, RE: <0.35%, S: <0.015%, P: <0.02%, C: <0.10%, and the balance is Ni.

[0012] Preferably, the RE is selected from Y, Ce, Gd, or Sm.

[0013] Preferably, the content of the RE is not less than 0.25%.

[0014] Preferably, the particle size of the component A is 0.05 - 1.0 μm; the particle size of the component B is 5 - 30 μm.

[0015] A preparation method of a high-temperature corrosion-resistant nickel alloy spraying material, adding component A and component B into absolute ethanol respectively, magnetically stirring at 500 - 2000 r / min for 2 - 5 h, then placing it under ultrasonic treatment at 50 KHz for 2 h to obtain an absolute ethanol suspension; filtering, taking the insoluble matter, and placing it in an 80°C drying oven for drying treatment for 2 h to obtain the high-temperature corrosion-resistant nickel alloy spraying material.

[0016] Preferably, the dosage ratio of the component A, the component B, and the absolute ethanol is 30 - 80 g: 20 - 70 g: 500 mL; wherein, the total weight of the component A and the component B is 100 g.

[0017] Preferably, the dosage ratio of component A, component B, and absolute ethanol is 60 - 80 g : 20 - 40 g : 500 mL; among them, the total weight of component A and component B is 100 g, which constitutes the inner layer material of the high-temperature corrosion-resistant nickel alloy spray coating.

[0018] Preferably, the dosage ratio of component A, component B, and absolute ethanol is 30 - 50 g : 50 - 70 g : 500 mL; among them, the total weight of component A and component B is 100 g, which constitutes the outer layer material of the high-temperature corrosion-resistant nickel alloy spray coating.

[0019] A coating prepared from a high-temperature corrosion-resistant nickel alloy spray material comprises the following steps:

[0020] S1: Surface pretreatment of the nickel alloy substrate: Place the substrate in a beaker containing degreasing solution and degrease it in an ultrasonic field; then put it into a sandblaster for roughening; then put it into the ultrasonic field again for cleaning;

[0021] S2: Spraying: Preheat the pretreated nickel alloy substrate, and use an atmospheric plasma spraying device for spraying. First, spray the inner layer material on the surface of the nickel alloy substrate, then heat it, and spray the outer layer material to obtain a coating prepared from a high-temperature corrosion-resistant nickel alloy spray material;

[0022] S3: Heat treatment: Perform vacuum heat treatment on the sprayed nickel alloy and air quench it.

[0023] Preferably, in S2, the pretreated nickel alloy substrate is preheated to 150 - 200 °C, after spraying the inner layer material, it is heated to 250 - 350 °C, then the outer layer material is sprayed, and it is heated to 450 - 550 °C and cooled to room temperature to obtain a coating prepared from a high-temperature corrosion-resistant nickel alloy spray material.

[0024] Preferably, in S2, the spraying thickness of the inner layer material is 100 - 150 μm; the spraying thickness of the outer layer material is 150 - 200 μm.

[0025] The present invention has the following beneficial effects:

[0026] (1) The present invention provides a high-temperature corrosion-resistant nickel alloy spraying material, including an inner layer material and an outer layer material. First, the element types of the inner layer material and the outer layer material are the same, having excellent interfacial bonding strength; second, a large amount of nano-ceramic materials in the inner layer material can fill the voids of the substrate to eliminate bubbles and, at the same time, play an anchoring role to enhance the interfacial bonding strength; the Ni / Cr alloy material in the inner layer material can form a good atomic structure stacking with the substrate, also having excellent interfacial bonding strength; at the same time, a relatively large amount of ceramic materials can increase the surface roughness of the inner layer coating, effectively improving the bonding strength with the outer layer coating; third, the ceramic materials in the outer layer material can effectively enhance the high-temperature oxidation resistance and wear resistance of the coating material; the Ni / Cr alloy material improves the acid corrosion resistance at high temperatures; and a relatively large amount of Ni / Cr alloy material, on the one hand, has better fluidity, can fill the pores of the ceramic materials, making the coating more dense; on the other hand, it can effectively wrap the ceramic materials to reduce mechanical wear.

[0027] (2) The present invention provides a high-temperature corrosion-resistant nickel alloy spraying material, in which the Ni / Cr alloy in the material. First, a structure mainly composed of compounds between Ni and Cr is formed, which has corrosion resistance and antioxidant properties in a high-temperature strong acid environment; second, a certain amount of Nb is added. On the one hand, Nb can reduce the tendency of strain cracks. By utilizing the characteristic that Nb can form the precipitation strengthening phase γ" of Ni3Nb in the alloy, the high-temperature strength, corrosion resistance and other properties of the alloy are improved; on the other hand, Nb has a good affinity with O and S, can form stable oxides and sulfides, and forms Cr-Nb oxides with Cr in the system, improving the stability of the oxides and having the effect of delaying corrosion; third, a certain amount of rare earth element RE is added to the alloy. On the one hand, RE and Nb act synergistically, and can improve the adhesion of the oxide film, refine the oxide grains, reduce the pores between the oxides, and reduce the diffusion rate of Cr ions to the outer layer at high temperatures, having good high-temperature oxidation resistance; on the other hand, by forming coordination with O at high temperatures, rare earth oxide nanoparticles can be preferentially formed, improving the high-temperature oxidation performance of the material, and having a higher number density at the γ, γ′, γ" phase interfaces, grain boundaries and dislocations, enhancing the high-temperature strength and antioxidant ability; fourth, a certain amount of Al and Ti are added to the alloy. On the one hand, it can form a dispersed γ′ phase to improve the high-temperature strength of the alloy; on the other hand, they are active elements, improving the weldability of the alloy material.

[0028] (3) The present invention provides a preparation method of a high-temperature corrosion-resistant nickel alloy spraying material, which reduces the impurity content by alcohol washing; and is freely suspended and dispersed in ethanol, improving the purity and precision of the spraying material.

[0029] (4) The present invention provides a coating prepared from a high-temperature corrosion-resistant nickel alloy spraying material. Through a two-step spraying process, it is beneficial to the release of stress between coatings, has excellent interfacial bonding strength and high-temperature corrosion resistance, and is also simple to operate and suitable for industrial promotion. Specific embodiments:

[0030] The present invention will be described in detail below in conjunction with embodiments. However, it should be understood that the following embodiments are only illustrative examples of the embodiments of the present invention, rather than limiting the scope of the present invention.

[0031] Example 1

[0032] A high-temperature corrosion-resistant nickel alloy spraying material, comprising an inner layer material and an outer layer material; the inner layer material and the outer layer material are used in combination; the inner layer material comprises a mixture of component A and component B; the outer layer material comprises a mixture of component A and component B; component A is a ceramic material (particle size 0.05 - 1.0 μm); component B is a nickel-chromium-based powder (particle size 5 - 30 μm).

[0033] The ceramic material is alumina.

[0034] The nickel-chromium-based powder comprises the following raw materials in parts by weight:

[0035] Cr: 34.0%, Ti: 2.0%, Al: 3.0%, Fe: 0.4%, Nb: 2.2%, Mn: 0.1%, RE: 0.25%, S: 0.01%, P: 0.01%, C: 0.08%, balance Ni.

[0036] The above RE is Y.

[0037] A preparation method of a high-temperature corrosion-resistant nickel alloy spraying material, adding component A and component B into absolute ethanol respectively, magnetically stirring at 1500 r / min for 3 h, then placing it in an ultrasonic treatment at 50 KHz for 2 h to obtain an absolute ethanol suspension; filtering, taking the insoluble matter, and placing it in a drying oven at 80 °C for drying treatment for 2 h to obtain a high-temperature corrosion-resistant nickel alloy spraying material.

[0038] The dosage ratio of the above component A, component B, and absolute ethanol is 70 g: 30 g: 500 mL; it constitutes the inner layer material of the high-temperature corrosion-resistant nickel alloy spraying.

[0039] The dosage ratio of the above component A, component B, and absolute ethanol is 40 g: 60 g: 500 mL; it constitutes the outer layer material of the high-temperature corrosion-resistant nickel alloy spraying.

[0040] A coating prepared from a high-temperature corrosion-resistant nickel alloy spraying material, comprising the following steps:

[0041] S1: Surface pretreatment of the nickel alloy substrate: Place the substrate in a beaker containing degreasing liquid and degrease it for 2 h in a 50 KHz ultrasonic field; then put it into a sandblaster for roughening to make the surface roughness 20 μm; then put it into a 50 KHz ultrasonic field again for cleaning for 1 h.

[0042] S2: Spraying: Preheat the pretreated nickel alloy substrate to 150 °C and spray it using an atmospheric plasma spraying device. First, spray the inner layer material on the surface of the nickel alloy substrate, then heat it to 300 °C and spray the outer layer material, heat it to 550 °C, and cool it to room temperature to obtain a coating prepared from a high-temperature corrosion-resistant nickel alloy spraying material.

[0043] The inner layer spraying process is as follows: powder feeding rate 42 g / min, spraying distance 100 mm, arc voltage 60 V, arc current 560 A, spray gun moving speed 80 cm / s, carrier powder gas rate 8 slpm.

[0044] The outer layer spraying process is as follows: powder feeding rate 40 g / min, spraying distance 180 mm, arc voltage 60 V, arc current 560 A, spray gun moving speed 80 cm / s, carrier powder gas rate 8 slpm.

[0045] In S2, the spraying thickness of the inner layer material is 120 μm; the spraying thickness of the outer layer material is 180 μm.

[0046] S3: Heat treatment: Perform vacuum heat treatment on the sprayed nickel alloy and air quench it.

[0047] The heat treatment process is as follows: In a vacuum heating furnace, heat it to 640 °C at a heating rate of 10 °C / min and hold for 90 min; then heat it to 840 °C at a heating rate of 9 °C / min and hold for 80 min; finally, heat it to 1025 °C at a heating rate of 8 °C / min and hold for 90 min.

[0048] The air quenching process is as follows: Cool it with nitrogen for 60 min, and the nitrogen pressure is 0.45 MPa.

[0049] Example 2

[0050] A high-temperature corrosion-resistant nickel alloy spraying material, including an inner layer material and an outer layer material; the inner layer material and the outer layer material are used in combination; the inner layer material includes a mixture of component A and component B; the outer layer material includes a mixture of component A and component B; component A is a ceramic material (particle size 0.05 - 1.0 μm); component B is a nickel-chromium-based powder (particle size 5 - 30 μm).

[0051] The ceramic material is zirconia.

[0052] The nickel-chromium-based powder includes the following raw materials in parts by weight:

[0053] Cr: 35.0%, Ti: 0.6%, Al: 5.0%, Fe: 0.5%, Nb: 3.0%, Mn: 0.1%, RE: 0.3%, S: 0.014%, P: 0.01%, C: 0.08%, balance Ni.

[0054] The above RE is Ce.

[0055] A preparation method of a high-temperature corrosion-resistant nickel alloy spraying material, adding component A and component B into absolute ethanol respectively, after magnetic stirring at 2000 r / min for 2 h, placing it in an ultrasonic treatment at 50 KHz for 2 h to obtain an absolute ethanol suspension; filtering, taking the insoluble matter, placing it in a drying oven at 80 °C for drying treatment for 2 h to obtain the high-temperature corrosion-resistant nickel alloy spraying material.

[0056] The dosage ratio of the above component A, component B and absolute ethanol is 75 g: 25 g: 500 mL; it constitutes the inner layer material of the high-temperature corrosion-resistant nickel alloy spraying.

[0057] The dosage ratio of the above component A, component B and absolute ethanol is 35 g: 65 g: 500 mL; it constitutes the outer layer material of the high-temperature corrosion-resistant nickel alloy spraying.

[0058] A coating prepared from a high-temperature corrosion-resistant nickel alloy spraying material, comprising the following steps:

[0059] S1: Surface pretreatment of the nickel alloy substrate: placing the substrate in a beaker filled with degreasing liquid, degreasing in a 50 KHz ultrasonic field for 2 h; then putting it into a sandblaster for roughening to make the surface roughness 20 μm; then putting it into a 50 KHz ultrasonic field for cleaning again for 1 h;

[0060] S2: Spraying: preheating the pretreated nickel alloy substrate to 200 °C, using an atmospheric plasma spraying device for spraying, first spraying the inner layer material on the surface of the nickel alloy substrate, then heating to 350 °C, spraying the outer layer material, heating to 550 °C, and cooling to room temperature to obtain a coating prepared from the high-temperature corrosion-resistant nickel alloy spraying material;

[0061] The inner layer spraying process is: powder feeding rate 42 g / min, spraying distance 100 mm, arc voltage 60 V, arc current 560 A, spray gun moving speed 80 cm / s, carrier powder gas rate 8 slpm.

[0062] The outer layer spraying process is: powder feeding rate 40 g / min, spraying distance 180 mm, arc voltage 60 V, arc current 560 A, spray gun moving speed 80 cm / s, carrier powder gas rate 8 slpm.

[0063] In the above S2, the spraying thickness of the inner layer material is 100 μm; the spraying thickness of the outer layer material is 200 μm.

[0064] S3: Heat treatment: The sprayed nickel alloy is subjected to vacuum heat treatment and gas quenching.

[0065] The heat treatment process is as follows: In a vacuum heating furnace, the temperature is raised to 640 °C at a heating rate of 10 °C / min and held for 90 min; then the temperature is raised to 840 °C at a heating rate of 9 °C / min and held for 80 min; finally, the temperature is raised to 1025 °C at a heating rate of 8 °C / min and held for 90 min.

[0066] The gas quenching process is as follows: Nitrogen cooling for 60 min with a nitrogen pressure of 0.45 MPa.

[0067] Example 3

[0068] A high-temperature corrosion-resistant nickel alloy spraying material, including an inner layer material and an outer layer material; the inner layer material and the outer layer material are used in combination; the inner layer material includes a mixture of component A and component B; the outer layer material includes a mixture of component A and component B; component A is a ceramic material (particle size 0.05 - 1.0 μm); component B is a nickel-chromium-based powder (particle size 5 - 30 μm).

[0069] The ceramic material is selected from molybdenum boride and chromium boride mixed in a mass ratio of 3 / 1.

[0070] The nickel-chromium-based powder includes the following raw materials in parts by weight:

[0071] Cr: 32.0%, Ti: 2.5%, Al: 4.0%, Fe: 0.4%, Nb: 1.0%, Mn: 0.1%, RE: 0.34%, S: 0.014%, P: 0.01%, C: 0.08%, with the balance being Ni.

[0072] The above RE is selected from Gd.

[0073] A preparation method of a high-temperature corrosion-resistant nickel alloy spraying material, adding component A and component B into absolute ethanol respectively, magnetically stirring at 500 r / min for 5 h, then placing it in an ultrasonic treatment at 50 KHz for 2 h to obtain an absolute ethanol suspension; filtering, taking the insoluble matter, and placing it in a drying oven at 80 °C for drying treatment for 2 h to obtain a high-temperature corrosion-resistant nickel alloy spraying material.

[0074] The dosage ratio of the above component A, component B, and absolute ethanol is 65 g: 35 g: 500 mL; it constitutes the inner layer material of the high-temperature corrosion-resistant nickel alloy spraying.

[0075] The dosage ratio of the above component A, component B, and absolute ethanol is 40 g: 60 g: 500 mL; it constitutes the outer layer material of the high-temperature corrosion-resistant nickel alloy spraying.

[0076] A coating prepared from a high-temperature corrosion-resistant nickel alloy spraying material, comprising the following steps:

[0077] S1: Surface pretreatment of the nickel alloy substrate: Place the substrate in a beaker containing degreasing liquid and degrease it in a 50 KHz ultrasonic field for 2 h; then put it into a sandblaster for roughening to make the surface roughness 20 μm; then put it into a 50 KHz ultrasonic field again for cleaning for 1 h;

[0078] S2: Spraying: Preheat the pretreated nickel alloy substrate to 180 °C, and use an atmospheric plasma spraying device for spraying. First, spray the inner layer material on the surface of the nickel alloy substrate, then heat it to 280 °C and spray the outer layer material, heat it to 480 °C, and cool it to room temperature to obtain a coating prepared from a high-temperature corrosion-resistant nickel alloy spraying material;

[0079] The inner layer spraying process is as follows: powder feeding rate 42 g / min, spraying distance 100 mm, arc voltage 60 V, arc current 560 A, gun moving speed 80 cm / s, carrier powder gas rate 8 slpm.

[0080] The outer layer spraying process is as follows: powder feeding rate 40 g / min, spraying distance 180 mm, arc voltage 60 V, arc current 560 A, gun moving speed 80 cm / s, carrier powder gas rate 8 slpm.

[0081] In S2, the spraying thickness of the inner layer material is 100 μm; the spraying thickness of the outer layer material is 200 μm.

[0082] S3: Heat treatment: Perform vacuum heat treatment on the sprayed nickel alloy and air quench it.

[0083] The heat treatment process is as follows: In a vacuum heating furnace, heat it to 640 °C at a heating rate of 10 °C / min, hold for 90 min; then heat it to 840 °C at a heating rate of 9 °C / min, hold for 80 min; finally heat it to 1025 °C at a heating rate of 8 °C / min, hold for 90 min.

[0084] The air quenching process is as follows: Cool with nitrogen for 60 min, and the nitrogen pressure is 0.45 MPa.

[0085] Example 4

[0086] A high-temperature corrosion-resistant nickel alloy spraying material, comprising an inner layer material and an outer layer material; the inner layer material and the outer layer material are used in combination; the inner layer material comprises a mixture of component A and component B; the outer layer material comprises a mixture of component A and component B; component A is a ceramic material (particle size 0.05 - 1.0 μm); component B is a nickel-chromium-based powder (particle size 5 - 30 μm).

[0087] The ceramic material is a mixture of molybdenum boride and chromium boride with a mass ratio of 2 / 1.

[0088] The nickel-chromium-based powder comprises the following raw materials in parts by weight:

[0089] Cr: 31.0%, Ti: 2.5%, Al: 4.0%, Fe: 0.4%, Nb: 1.5%, Mn: 0.1%, RE: 0.34%, S: 0.014%, P: 0.01%, C: 0.08%, with the balance being Ni.

[0090] The above RE is Sm.

[0091] A preparation method of a high-temperature corrosion-resistant nickel alloy spraying material is as follows: Component A and Component B are respectively added into absolute ethanol, magnetically stirred at 1000 r / min for 4 h, and then placed in an ultrasonic treatment at 50 KHz for 2 h to obtain an absolute ethanol suspension; filtered, the insoluble matter is taken and placed in a drying oven at 80 °C for drying treatment for 2 h to obtain the high-temperature corrosion-resistant nickel alloy spraying material.

[0092] The dosage ratio of the above Component A, Component B, and absolute ethanol is 60 g: 40 g: 500 mL; it constitutes the inner layer material of the high-temperature corrosion-resistant nickel alloy spraying.

[0093] The dosage ratio of the above Component A, Component B, and absolute ethanol is 30 g: 70 g: 500 mL; it constitutes the outer layer material of the high-temperature corrosion-resistant nickel alloy spraying.

[0094] A coating prepared from a high-temperature corrosion-resistant nickel alloy spraying material comprises the following steps:

[0095] S1: Surface pretreatment of the nickel alloy substrate: The substrate is placed in a beaker containing degreasing liquid and degreased in a 50 KHz ultrasonic field for 2 h; then it is put into a sandblaster for roughening so that the surface roughness is 20 μm; then it is put into a 50 KHz ultrasonic field again for cleaning for 1 h;

[0096] S2: Spraying: The pretreated nickel alloy substrate is preheated to 180 °C, and sprayed using an atmospheric plasma spraying device. First, the inner layer material is sprayed on the surface of the nickel alloy substrate, then heated to 250 °C, the outer layer material is sprayed, heated to 450 °C, and cooled to room temperature to obtain the coating prepared from the high-temperature corrosion-resistant nickel alloy spraying material;

[0097] The inner layer spraying process is as follows: powder feeding rate 42 g / min, spraying distance 100 mm, arc voltage 60 V, arc current 560 A, gun moving speed 80 cm / s, carrier powder gas rate 8 slpm.

[0098] The outer layer spraying process is as follows: powder feeding rate is 40 g / min, spraying distance is 180 mm, arc voltage is 60 V, arc current is 560 A, spray gun moving speed is 80 cm / s, and powder-carrying gas rate is 8 slpm.

[0099] In S2, the spraying thickness of the inner layer material is 100 μm; the spraying thickness of the outer layer material is 200 μm.

[0100] S3: Heat treatment: The sprayed nickel alloy is subjected to vacuum heat treatment and gas quenching.

[0101] The heat treatment process is as follows: In a vacuum heating furnace, heat up to 640 °C at a heating rate of 10 °C / min and hold for 90 min; then heat up to 840 °C at a heating rate of 9 °C / min and hold for 80 min; finally heat up to 1025 °C at a heating rate of 8 °C / min and hold for 90 min.

[0102] The gas quenching process is as follows: Cool with nitrogen for 60 min, and the nitrogen pressure is 0.45 MPa.

[0103] Example 5

[0104] A high-temperature corrosion-resistant nickel alloy spraying material, including an inner layer material and an outer layer material; the inner layer material and the outer layer material are used in combination; the inner layer material includes a mixture of component A and component B; the outer layer material includes a mixture of component A and component B; component A is a ceramic material (particle size is 0.05 - 1.0 μm); component B is a nickel-chromium-based powder (particle size is 5 - 30 μm).

[0105] The ceramic material is molybdenum boride.

[0106] The nickel-chromium-based powder includes the following raw materials in parts by weight:

[0107] Cr: 33.0%, Ti: 3.0%, Al: 5.0%, Fe: 0.3%, Nb: 2.5%, Mn: 0.1%, RE: 0.25%, S: 0.012%, P: 0.01%, C: 0.08%, with the balance being Ni.

[0108] The above RE is Y.

[0109] A preparation method of a high-temperature corrosion-resistant nickel alloy spraying material, adding component A and component B into absolute ethanol respectively, magnetically stirring at 500 r / min for 5 h, then placing it in an ultrasonic treatment at 50 KHz for 2 h to obtain an absolute ethanol suspension; filtering, taking the insoluble matter, and placing it in a drying oven at 80 °C for drying treatment for 2 h to obtain the high-temperature corrosion-resistant nickel alloy spraying material.

[0110] The dosage ratio of the above-mentioned component A, component B, and absolute ethanol is 80 g: 20 g: 500 mL; it constitutes the inner layer material of the high-temperature corrosion-resistant nickel alloy spray coating.

[0111] The dosage ratio of the above-mentioned component A, component B, and absolute ethanol is 30 g: 70 g: 500 mL; it constitutes the outer layer material of the high-temperature corrosion-resistant nickel alloy spray coating.

[0112] A coating prepared from a high-temperature corrosion-resistant nickel alloy spray material includes the following steps:

[0113] S1: Surface pretreatment of the nickel alloy substrate: Place the substrate in a beaker containing degreasing solution and degrease it in a 50 KHz ultrasonic field for 2 h; then put it into a sandblaster for roughening to make the surface roughness 20 μm; then put it into a 50 KHz ultrasonic field again for cleaning for 1 h;

[0114] S2: Spraying: Preheat the pretreated nickel alloy substrate to 180 °C, and use an atmospheric plasma spraying device for spraying. First, spray the inner layer material on the surface of the nickel alloy substrate, then heat it to 280 °C, spray the outer layer material, heat it to 480 °C, and cool it to room temperature to obtain a coating prepared from a high-temperature corrosion-resistant nickel alloy spray material;

[0115] The inner layer spraying process is as follows: powder feeding rate 42 g / min, spraying distance 100 mm, arc voltage 60 V, arc current 560 A, spray gun moving speed 80 cm / s, carrier powder gas rate 8 slpm.

[0116] The outer layer spraying process is as follows: powder feeding rate 40 g / min, spraying distance 180 mm, arc voltage 60 V, arc current 560 A, spray gun moving speed 80 cm / s, carrier powder gas rate 8 slpm.

[0117] In the above S2, the spraying thickness of the inner layer material is 150 μm; the spraying thickness of the outer layer material is 150 μm.

[0118] S3: Heat treatment: Perform vacuum heat treatment on the sprayed nickel alloy and air quench it.

[0119] The heat treatment process is as follows: In a vacuum heating furnace, heat it to 640 °C at a heating rate of 10 °C / min and hold for 90 min; then heat it to 840 °C at a heating rate of 9 °C / min and hold for 80 min; finally heat it to 1025 °C at a heating rate of 8 °C / min and hold for 90 min.

[0120] The air quenching process is as follows: Cool with nitrogen for 60 min, and the nitrogen pressure is 0.45 MPa.

[0121] Example 6

[0122] A high-temperature corrosion-resistant nickel alloy spraying material, comprising an inner layer material and an outer layer material; the inner layer material and the outer layer material are used in combination; the inner layer material comprises a mixture of component A and component B; the outer layer material comprises a mixture of component A and component B; component A is a ceramic material (particle size 0.05 - 1.0 μm); component B is a nickel-chromium-based powder (particle size 5 - 30 μm).

[0123] The ceramic material is chromium boride.

[0124] The nickel-chromium-based powder comprises the following raw materials in parts by weight:

[0125] Cr: 30.0%, Ti: 3.0%, Al: 5.0%, Fe: 0.3%, Nb: 2.5%, Mn: 0.1%, RE: 0.25%, S: 0.012%, P: 0.01%, C: 0.08%, with the balance being Ni.

[0126] The above RE is Y.

[0127] A preparation method of a high-temperature corrosion-resistant nickel alloy spraying material, adding component A and component B into absolute ethanol respectively, magnetically stirring at 1000 r / min for 4 h, then placing it in an ultrasonic treatment at 50 KHz for 2 h to obtain an absolute ethanol suspension; filtering, taking the insoluble matter, placing it in a drying oven at 80 °C for drying treatment for 2 h to obtain a high-temperature corrosion-resistant nickel alloy spraying material.

[0128] The dosage ratio of the above component A, component B, and absolute ethanol is 70 g: 30 g: 500 mL; it constitutes the inner layer material of the high-temperature corrosion-resistant nickel alloy spraying.

[0129] The dosage ratio of the above component A, component B, and absolute ethanol is 40 g: 60 g: 500 mL; it constitutes the outer layer material of the high-temperature corrosion-resistant nickel alloy spraying.

[0130] A coating prepared from a high-temperature corrosion-resistant nickel alloy spraying material, comprising the following steps:

[0131] S1: Surface pretreatment of the nickel alloy substrate: placing the substrate in a beaker containing degreasing liquid, degreasing in a 50 KHz ultrasonic field for 2 h; then putting it into a sandblaster for roughening to make the surface roughness 20 μm; then putting it into a 50 KHz ultrasonic field again for cleaning for 1 h;

[0132] S2: Spraying: preheating the pretreated nickel alloy substrate to 180 °C, using an atmospheric plasma spraying device for spraying, first spraying the inner layer material on the surface of the nickel alloy substrate, then heating to 280 °C, spraying the outer layer material, heating to 480 °C, and cooling to room temperature to obtain a coating prepared from a high-temperature corrosion-resistant nickel alloy spraying material;

[0133] The inner layer spraying process is as follows: powder feeding rate is 42 g / min, spraying distance is 100 mm, arc voltage is 60 V, arc current is 560 A, gun moving speed is 80 cm / s, and carrier powder gas rate is 8 slpm.

[0134] The outer layer spraying process is as follows: powder feeding rate is 40 g / min, spraying distance is 180 mm, arc voltage is 60 V, arc current is 560 A, gun moving speed is 80 cm / s, and carrier powder gas rate is 8 slpm.

[0135] In S2, the spraying thickness of the inner layer material is 150 μm; the spraying thickness of the outer layer material is 150 μm.

[0136] S3: Heat treatment: The sprayed nickel alloy is subjected to vacuum heat treatment and gas quenching.

[0137] The heat treatment process is as follows: In a vacuum heating furnace, heat up to 640 °C at a heating rate of 10 °C / min and hold for 90 min; then heat up to 840 °C at a heating rate of 9 °C / min and hold for 80 min; finally heat up to 1025 °C at a heating rate of 8 °C / min and hold for 90 min.

[0138] The gas quenching process is as follows: Cool with nitrogen for 60 min, and the nitrogen pressure is 0.45 MPa.

[0139] Example 7

[0140] A high-temperature corrosion-resistant nickel alloy spraying material includes an inner layer material and an outer layer material; the inner layer material and the outer layer material are used in combination; the inner layer material includes a mixture of component A and component B; the outer layer material includes a mixture of component A and component B; component A is a ceramic material (particle size is 0.05 - 1.0 μm); component B is a nickel-chromium-based powder (particle size is 5 - 30 μm).

[0141] The ceramic material is alumina.

[0142] The nickel-chromium-based powder includes the following raw materials by weight:

[0143] Cr: 34.0%, Ti: 2.0%, Al: 3.0%, Fe: 0.4%, Nb: 2.2%, Mn: 0.1%, RE: 0.25%, S: 0.01%, P: 0.01%, C: 0.08%, with the balance being Ni.

[0144] The above RE is Y.

[0145] A preparation method of a high-temperature corrosion-resistant nickel alloy spraying material. Respectively add component A and component B into absolute ethanol, magnetically stir at 1500 r / min for 3 h, then place it in an ultrasonic treatment at 50 KHz for 2 h to obtain an absolute ethanol suspension; filter, take the insoluble matter, place it in a drying oven at 80 °C for drying treatment for 2 h to obtain the high-temperature corrosion-resistant nickel alloy spraying material.

[0146] The dosage ratio of the above-mentioned component A, component B, and absolute ethanol is 60 g : 40 g : 500 mL; it constitutes the inner layer material of the high-temperature corrosion-resistant nickel alloy spraying.

[0147] The dosage ratio of the above-mentioned component A, component B, and absolute ethanol is 50 g : 50 g : 500 mL; it constitutes the outer layer material of the high-temperature corrosion-resistant nickel alloy spraying.

[0148] A coating prepared from a high-temperature corrosion-resistant nickel alloy spraying material, including the following steps:

[0149] S1: Surface pretreatment of the nickel alloy substrate: Place the substrate in a beaker containing degreasing liquid, degrease in a 50 KHz ultrasonic field for 2 h; then put it into a sandblaster to roughen the surface to a roughness of 20 μm; then put it into a 50 KHz ultrasonic field again for cleaning for 1 h;

[0150] S2: Spraying: Preheat the pretreated nickel alloy substrate to 150 °C, and use an atmospheric plasma spraying device for spraying. First, spray the inner layer material on the surface of the nickel alloy substrate, then heat it to 250 °C, spray the outer layer material, heat it to 450 °C, and cool it to room temperature to obtain a coating prepared from the high-temperature corrosion-resistant nickel alloy spraying material;

[0151] The inner layer spraying process is: powder feeding rate 42 g / min, spraying distance 100 mm, arc voltage 60 V, arc current 560 A, gun moving speed 80 cm / s, carrier powder gas rate 8 slpm.

[0152] The outer layer spraying process is: powder feeding rate 40 g / min, spraying distance 180 mm, arc voltage 60 V, arc current 560 A, gun moving speed 80 cm / s, carrier powder gas rate 8 slpm.

[0153] In the above S2, the spraying thickness of the inner layer material is 120 μm; the spraying thickness of the outer layer material is 180 μm.

[0154] S3: Heat treatment: Perform vacuum heat treatment on the sprayed nickel alloy and air quench.

[0155] The heat treatment process is as follows: In a vacuum heating furnace, heat up to 640°C at a heating rate of 10°C / min and hold for 90 min; then heat up to 840°C at a heating rate of 9°C / min and hold for 80 min; finally, heat up to 1025°C at a heating rate of 8°C / min and hold for 90 min.

[0156] The gas quenching process is as follows: Cool with nitrogen for 60 min, and the nitrogen pressure is 0.45 MPa.

[0157] Example 8

[0158] A high-temperature corrosion-resistant nickel alloy spraying material includes an inner layer material and an outer layer material; the inner layer material and the outer layer material are used in combination; the inner layer material includes a mixture of component A and component B; the outer layer material includes a mixture of component A and component B; component A is a ceramic material (particle size 0.05 - 1.0 μm); component B is a nickel-chromium-based powder (particle size 5 - 30 μm).

[0159] The ceramic material is alumina.

[0160] The nickel-chromium-based powder includes the following raw materials in parts by weight:

[0161] Cr: 34.0%, Ti: 2.0%, Al: 3.0%, Fe: 0.4%, Nb: 2.2%, Mn: 0.1%, RE: 0.25%, S: 0.01%, P: 0.01%, C: 0.08%, with the balance being Ni.

[0162] The above RE is Y.

[0163] A preparation method of a high-temperature corrosion-resistant nickel alloy spraying material is as follows: Add component A and component B into absolute ethanol respectively. After magnetic stirring at 1500 r / min for 3 h, place it in an ultrasonic treatment at 50 KHz for 2 h to obtain an absolute ethanol suspension; filter, take the insoluble matter, and place it in a drying oven at 80°C for drying treatment for 2 h to obtain a high-temperature corrosion-resistant nickel alloy spraying material.

[0164] The dosage ratio of the above component A, component B, and absolute ethanol is 80 g: 20 g: 500 mL; it constitutes the inner layer material of the high-temperature corrosion-resistant nickel alloy spraying.

[0165] The dosage ratio of the above component A, component B, and absolute ethanol is 30 g: 70 g: 500 mL; it constitutes the outer layer material of the high-temperature corrosion-resistant nickel alloy spraying.

[0166] A coating prepared from a high-temperature corrosion-resistant nickel alloy spraying material includes the following steps:

[0167] S1: Surface pretreatment of nickel alloy substrate: Place the substrate in a beaker filled with degreasing solution and degrease it for 2 h in a 50 KHz ultrasonic field; then put it into a sandblaster to roughen the surface to a roughness of 20 μm; then put it into a 50 KHz ultrasonic field again for cleaning for 1 h.

[0168] S2: Spraying: Preheat the pretreated nickel alloy substrate to 200 °C and spray it using an atmospheric plasma spraying device. First, spray the inner layer material on the surface of the nickel alloy substrate, then heat it to 350 °C and spray the outer layer material, heat it to 550 °C, and cool it to room temperature to obtain a coating prepared from a high-temperature corrosion-resistant nickel alloy spraying material.

[0169] The inner layer spraying process is as follows: powder feeding rate 42 g / min, spraying distance 100 mm, arc voltage 60 V, arc current 560 A, gun moving speed 80 cm / s, carrier powder gas rate 8 slpm.

[0170] The outer layer spraying process is as follows: powder feeding rate 40 g / min, spraying distance 180 mm, arc voltage 60 V, arc current 560 A, gun moving speed 80 cm / s, carrier powder gas rate 8 slpm.

[0171] In S2, the spraying thickness of the inner layer material is 120 μm; the spraying thickness of the outer layer material is 180 μm.

[0172] S3: Heat treatment: Perform vacuum heat treatment and gas quenching on the sprayed nickel alloy.

[0173] The heat treatment process is as follows: In a vacuum heating furnace, heat it to 640 °C at a heating rate of 10 °C / min and hold for 90 min; then heat it to 840 °C at a heating rate of 9 °C / min and hold for 80 min; finally heat it to 1025 °C at a heating rate of 8 °C / min and hold for 90 min.

[0174] The gas quenching process is as follows: Cool with nitrogen for 60 min, and the nitrogen pressure is 0.45 MPa.

[0175] Examples of comparative examples 1 - 12 are all compared with example 1:

[0176] Example of comparative example 1

[0177] A high-temperature corrosion-resistant nickel alloy spraying material, the difference in its components from specific example 1 is that component A is not added.

[0178] A preparation method of a high-temperature corrosion-resistant nickel alloy spraying material is the same as that of specific example 1, the difference being that component A is not added.

[0179] A coating prepared from a high-temperature corrosion-resistant nickel alloy spraying material, and its preparation method is the same as that of specific example 1.

[0180] Example of Comparative Implementation 2

[0181] A high-temperature corrosion-resistant nickel alloy spraying material, the difference in its components from those of Specific Example 1 is that the particle size of component A < 0.05 μm.

[0182] The preparation method of a high-temperature corrosion-resistant nickel alloy spraying material is the same as that of Specific Example 1.

[0183] A coating prepared from a high-temperature corrosion-resistant nickel alloy spraying material, the preparation method of which is the same as that of Specific Example 1.

[0184] Example of Comparative Implementation 3

[0185] A high-temperature corrosion-resistant nickel alloy spraying material, the difference in its components from those of Specific Example 1 is that the particle size of component A > 1.0 μm.

[0186] The preparation method of a high-temperature corrosion-resistant nickel alloy spraying material is the same as that of Specific Example 1.

[0187] A coating prepared from a high-temperature corrosion-resistant nickel alloy spraying material, the preparation method of which is the same as that of Specific Example 1.

[0188] Example of Comparative Implementation 4

[0189] A high-temperature corrosion-resistant nickel alloy spraying material, the difference in its components from those of Specific Example 1 is that component B is not added.

[0190] The preparation method of a high-temperature corrosion-resistant nickel alloy spraying material is the same as that of Specific Example 1, except that component B is not added.

[0191] A coating prepared from a high-temperature corrosion-resistant nickel alloy spraying material, the preparation method of which is the same as that of Specific Example 1.

[0192] Example of Comparative Implementation 5

[0193] A high-temperature corrosion-resistant nickel alloy spraying material, the difference in its components from those of Specific Example 1 is that Ti and Al are not added to component B.

[0194] The preparation method of a high-temperature corrosion-resistant nickel alloy spraying material is the same as that of Specific Example 1.

[0195] A coating prepared from a high-temperature corrosion-resistant nickel alloy spraying material, the preparation method of which is the same as that of Specific Example 1.

[0196] Example of Comparative Implementation 6

[0197] A high-temperature corrosion-resistant nickel alloy spraying material, the difference in its components from those of Specific Example 1 is that Nb is not added to component B.

[0198] The preparation method of a high-temperature corrosion-resistant nickel alloy spraying material is the same as that in Specific Example 1.

[0199] A coating prepared from a high-temperature corrosion-resistant nickel alloy spraying material, and its preparation method is the same as that in Specific Example 1.

[0200] Implement Comparative Example 7

[0201] A high-temperature corrosion-resistant nickel alloy spraying material, the difference in its components from Specific Example 1 is that RE is not added in component B.

[0202] The preparation method of a high-temperature corrosion-resistant nickel alloy spraying material is the same as that in Specific Example 1.

[0203] A coating prepared from a high-temperature corrosion-resistant nickel alloy spraying material, and its preparation method is the same as that in Specific Example 1.

[0204] Implement Comparative Example 8

[0205] A high-temperature corrosion-resistant nickel alloy spraying material, and its components are the same as those in Specific Example 1.

[0206] A preparation method of a high-temperature corrosion-resistant nickel alloy spraying material, mixing component A and component B by mass ratio respectively to obtain the high-temperature corrosion-resistant nickel alloy spraying material.

[0207] The dosage ratio of the above-mentioned component A and component B is 70 g: 30 g; it constitutes the inner layer material of the high-temperature corrosion-resistant nickel alloy spraying.

[0208] The dosage ratio of the above-mentioned component A and component B is 40 g: 60 g; it constitutes the outer layer material of the high-temperature corrosion-resistant nickel alloy spraying.

[0209] A coating prepared from a high-temperature corrosion-resistant nickel alloy spraying material, and its preparation method is the same as that in Specific Example 1.

[0210] Implement Comparative Example 9

[0211] A high-temperature corrosion-resistant nickel alloy spraying material, and its components are the same as those in Specific Example 1.

[0212] A preparation method of a high-temperature corrosion-resistant nickel alloy spraying material, adding component A and component B into absolute ethanol respectively, magnetically stirring at 1500 r / min for 3 h, then placing it in an ultrasonic treatment at 50 KHz for 2 h to obtain an absolute ethanol suspension; filtering, taking the insoluble matter, and placing it in a drying oven at 80 °C for drying treatment for 2 h to obtain the high-temperature corrosion-resistant nickel alloy spraying material.

[0213] The dosage ratio of the above-mentioned component A, component B and absolute ethanol is 70 g: 30 g: 500 mL; it constitutes the outer layer material of the high-temperature corrosion-resistant nickel alloy spraying.

[0214] The dosage ratio of the above A component, B component and absolute ethanol is 40 g: 60 g: 500 mL; it constitutes the inner layer material of the high-temperature corrosion-resistant nickel alloy spray coating.

[0215] A coating prepared from a high-temperature corrosion-resistant nickel alloy spraying material, and its preparation method is the same as that of Specific Example 1.

[0216] Implement Comparative Example 10

[0217] A high-temperature corrosion-resistant nickel alloy spraying material, comprising a mixture of A component and B component; the A component is a ceramic material (particle size 0.05 - 1.0 μm); the B component is a nickel-chromium-based powder (particle size 5 - 30 μm).

[0218] The ceramic material is alumina.

[0219] The nickel-chromium-based powder comprises the following raw materials in parts by weight:

[0220] Cr: 34.0%, Ti: 2.0%, Al: 3.0%, Fe: 0.4%, Nb: 2.2%, Mn: 0.1%, RE: 0.25%, S: 0.01%, P: 0.01%, C: 0.08%, with the balance being Ni.

[0221] The above RE is Y.

[0222] A preparation method of a high-temperature corrosion-resistant nickel alloy spraying material, adding the A component and B component into absolute ethanol, magnetically stirring at 1500 r / min for 3 h, then placing it in an ultrasonic treatment at 50 KHz for 2 h to obtain an absolute ethanol suspension; filtering, taking the insoluble matter, and placing it in a drying oven at 80 °C for drying treatment for 2 h to obtain the high-temperature corrosion-resistant nickel alloy spraying material.

[0223] The dosage ratio of the above A component, B component and absolute ethanol is 70 g: 30 g: 500 mL.

[0224] A coating prepared from a high-temperature corrosion-resistant nickel alloy spraying material, comprising the following steps:

[0225] S1: Surface pretreatment of the nickel alloy substrate: placing the substrate in a beaker filled with degreasing solution, degreasing in a 50 KHz ultrasonic field for 2 h; then putting it into a sandblaster for roughening to make the surface roughness 20 μm; then putting it into a 50 KHz ultrasonic field again for cleaning for 1 h;

[0226] S2: Spraying: preheating the pretreated nickel alloy substrate to 150 °C, spraying with an atmospheric plasma spraying device, spraying on the surface of the nickel alloy substrate, then heating to 550 °C and cooling to room temperature to obtain a coating prepared from a high-temperature corrosion-resistant nickel alloy spraying material;

[0227] The spraying process is as follows: powder feeding rate is 42 g / min, spraying distance is 100 mm, arc voltage is 60 V, arc current is 560 A, gun moving speed is 80 cm / s, and carrier powder gas rate is 8 slpm.

[0228] In S2, the coating thickness is 300 μm.

[0229] S3: Heat treatment: The sprayed nickel alloy is subjected to vacuum heat treatment and gas quenching.

[0230] The heat treatment process is as follows: In a vacuum heating furnace, it is heated to 640 °C at a heating rate of 10 °C / min and held for 90 min; then heated to 840 °C at a heating rate of 9 °C / min and held for 80 min; finally heated to 1025 °C at a heating rate of 8 °C / min and held for 90 min.

[0231] The gas quenching process is as follows: Nitrogen cooling for 60 min, and nitrogen pressure is 0.45 MPa.

[0232] Implement Comparative Example 11

[0233] A high-temperature corrosion-resistant nickel alloy spraying material, including a mixture of component A and component B; Component A is a ceramic material (particle size is 0.05 - 1.0 μm); Component B is a nickel-chromium-based powder (particle size is 5 - 30 μm).

[0234] The ceramic material is alumina.

[0235] The nickel-chromium-based powder includes the following raw materials in parts by weight:

[0236] Cr: 34.0%, Ti: 2.0%, Al: 3.0%, Fe: 0.4%, Nb: 2.2%, Mn: 0.1%, RE: 0.25%, S: 0.01%, P: 0.01%, C: 0.08%, with the balance being Ni.

[0237] The above RE is Y.

[0238] A preparation method of a high-temperature corrosion-resistant nickel alloy spraying material, adding component A and component B into absolute ethanol, magnetically stirring at 1500 r / min for 3 h, then placing it in an ultrasonic treatment at 50 KHz for 2 h to obtain an absolute ethanol suspension; filtering, taking the insoluble matter, and placing it in a drying oven at 80 °C for drying treatment for 2 h to obtain the high-temperature corrosion-resistant nickel alloy spraying material.

[0239] The dosage ratio of the above component A, component B, and absolute ethanol is 40 g: 60 g: 500 mL.

[0240] A coating prepared from a high-temperature corrosion-resistant nickel alloy spraying material, including the following steps:

[0241] S1: Surface pretreatment of nickel alloy substrate: Place the substrate in a beaker containing degreasing solution and degrease it in a 50 KHz ultrasonic field for 2 h; then put it into a sandblaster for roughening to make the surface roughness 20 μm; then put it into a 50 KHz ultrasonic field again for cleaning for 1 h;

[0242] S2: Spraying: Preheat the pretreated nickel alloy substrate to 150 °C, and use an atmospheric plasma spraying device for spraying. Spray on the surface of the nickel alloy substrate, heat it to 550 °C, and cool it to room temperature to obtain a coating prepared from a high-temperature corrosion-resistant nickel alloy spraying material;

[0243] The spraying process is as follows: powder feeding rate 40 g / min, spraying distance 180 mm, arc voltage 60 V, arc current 560 A, gun moving speed 80 cm / s, carrier powder gas rate 8 slpm.

[0244] In the above S2, the coating thickness is 300 μm.

[0245] S3: Heat treatment: Perform vacuum heat treatment on the sprayed nickel alloy and air quench it.

[0246] The heat treatment process is as follows: In a vacuum heating furnace, heat it up to 640 °C at a heating rate of 10 °C / min and hold for 90 min; then heat it up to 840 °C at a heating rate of 9 °C / min and hold for 80 min; finally heat it up to 1025 °C at a heating rate of 8 °C / min and hold for 90 min.

[0247] The air quenching process is as follows: Cool with nitrogen for 60 min, and the nitrogen pressure is 0.45 MPa.

[0248] Implement Comparative Example 12

[0249] A high-temperature corrosion-resistant nickel alloy spraying material, including an inner layer material and an outer layer material; the inner layer material and the outer layer material are used in combination; the inner layer material is a ceramic material (particle size 0.05 - 1.0 μm); the outer layer material is a nickel-chromium-based powder (particle size 5 - 30 μm).

[0250] The ceramic material is alumina.

[0251] The nickel-chromium-based powder includes the following raw materials in parts by weight:

[0252] Cr: 34.0%, Ti: 2.0%, Al: 3.0%, Fe: 0.4%, Nb: 2.2%, Mn: 0.1%, RE: 0.25%, S: 0.01%, P: 0.01%, C: 0.08%, and the balance is Ni.

[0253] The above RE is Y.

[0254] A preparation method of a high-temperature corrosion-resistant nickel alloy spraying material. The inner-layer material and the outer-layer material are respectively added to absolute ethanol. After magnetic stirring at 1500 r / min for 3 h, it is placed in an ultrasonic treatment at 50 KHz for 2 h to obtain an absolute ethanol suspension; it is filtered, the insoluble matter is taken, and it is placed in a drying oven at 80 °C for drying treatment for 2 h to obtain a high-temperature corrosion-resistant nickel alloy spraying material.

[0255] A coating prepared from a high-temperature corrosion-resistant nickel alloy spraying material, comprising the following steps:

[0256] S1: Surface pretreatment of the nickel alloy substrate: The substrate is placed in a beaker containing degreasing liquid and degreased in a 50 KHz ultrasonic field for 2 h; then it is put into a sandblaster for roughening so that the surface roughness is 20 μm; then it is put into a 50 KHz ultrasonic field again for cleaning for 1 h;

[0257] S2: Spraying: The pretreated nickel alloy substrate is preheated to 150 °C, and atmospheric plasma spraying equipment is used for spraying. First, the inner-layer material is sprayed on the surface of the nickel alloy substrate, then it is heated to 300 °C, the outer-layer material is sprayed, heated to 550 °C, and cooled to room temperature to obtain a coating prepared from a high-temperature corrosion-resistant nickel alloy spraying material;

[0258] The inner-layer spraying process is as follows: powder feeding rate 42 g / min, spraying distance 100 mm, arc voltage 60 V, arc current 560 A, spray gun moving speed 80 cm / s, carrier powder gas rate 8 slpm.

[0259] The outer-layer spraying process is as follows: powder feeding rate 40 g / min, spraying distance 180 mm, arc voltage 60 V, arc current 560 A, spray gun moving speed 80 cm / s, carrier powder gas rate 8 slpm.

[0260] In the above S2, the spraying thickness of the inner-layer material is 120 μm; the spraying thickness of the outer-layer material is 180 μm.

[0261] S3: Heat treatment: The sprayed nickel alloy is subjected to vacuum heat treatment and gas quenching.

[0262] The heat treatment process is as follows: In a vacuum heating furnace, it is heated to 640 °C at a heating rate of 10 °C / min and held for 90 min; then it is heated to 840 °C at a heating rate of 9 °C / min and held for 80 min; finally, it is heated to 1025 °C at a heating rate of 8 °C / min and held for 90 min.

[0263] The gas quenching process is as follows: nitrogen cooling for 60 min, nitrogen pressure 0.45 MPa.

[0264] The physical properties of the coatings prepared from the high-temperature corrosion-resistant nickel alloy spraying materials of Examples 1-8 and Comparative Examples 1-12 of the present invention were measured separately, and the results are shown in Table 1.

[0265] Table 1 Physical Test Properties of Each Example

[0266]

[0267]

[0268] It can be observed from Examples 1-12 that the high-temperature corrosion-resistant nickel alloy spraying material of the present invention has high hardness and low wear; meanwhile, it has excellent high-temperature oxidation resistance and high-temperature corrosion resistance.

[0269] It can be observed from Example 1 and Comparative Examples 1-3 that adding ceramic materials and selecting appropriate particle sizes to the high-temperature corrosion-resistant nickel alloy spraying material of the present invention have important effects on the properties of the material, specifically, it is superior in hardness, fracture toughness and wear;

[0270] It can be observed from Example 1 and Comparative Examples 4-7 that adding nickel-chromium alloy and regulating the components of the nickel-chromium alloy are beneficial to giving full play to the best performance advantages of the material, specifically, in high-temperature corrosion resistance and high-temperature oxidation resistance; in Example 1 and Comparative Example 4, since it is a pure ceramic material coating, there are great deficiencies in toughness and mechanical wear; it can be observed from Example 1 and Comparative Examples 5-7 that the trace elements existing in the nickel-chromium alloy have a positive effect on the high-temperature corrosion resistance and high-temperature oxidation resistance of the alloy;

[0271] It can be observed from Example 1 and Comparative Example 8 that the influence of the alcohol washing process on the material properties;

[0272] It can be observed from Example 1 and Comparative Examples 9-11 that the coatings after two sprayings have better properties due to partial release of stress; at the same time, the greater role of the inner layer material is to anchor the substrate and the outer layer material, improving the interlayer bonding strength; the main role of the outer layer material is to resist high-temperature oxidation and high-temperature corrosion, and it has both high hardness and low wear.

[0273] It can be observed from Example 1 and Comparative Example 12 that there is a delamination problem in the pure ceramic coating spraying.

[0274] In summary, the high-temperature corrosion-resistant nickel alloy spraying material of the present invention has excellent interlayer bonding strength and high-temperature corrosion resistance, and at the same time, the operation is simple and suitable for industrial promotion.

[0275] The test methods are as follows:

[0276] (1) Hardness. The hardness of the coating was measured using a microhardness tester (HXS-1000A) with a load of 30 kgf and a loading time of 15 s. Five points were tested for each specimen, and the arithmetic mean was taken to obtain the hardness value (HV30).

[0277] (2) Fracture toughness. The indentation method was used to determine the fracture toughness K IC of the coating. The fracture toughness K IC was calculated according to the following formula:

[0278]

[0279] where: HV30 represents the hardness value with the unit of MPa;

[0280] ∑l is the total crack length with the unit of mm.

[0281] (3) Wear loss weight. The friction and wear test was carried out using a UMT-TriboLab multi-functional friction and wear tester. The friction pair was a spherical Si3N4 with a hardness of 2200 HV 0.5 . The friction load was 100 N, the swing frequency of the friction pair was 5 Hz. After 1 h of wear, the sample was weighed on an electronic balance with a sensitivity of 0.1 mg, and the average value of the three weighings was taken.

[0282] (4) Thermal oxidation test: Refer to HB5258-83 "Determination Method for Oxidation Resistance of Steels and Alloys". The specimen was placed in a porcelain boat pre-burned to constant weight, making it in line contact with the wall of the porcelain boat. The oxidation test was carried out in a box-type electric furnace at a temperature of 800 °C. The static weight gain method was used for determination. After 100 h of oxidation, the porcelain boat was taken out and weighed on an electronic analytical balance (sensitivity 0.1 mg) to measure the weight change respectively.

[0283] (5) Hot corrosion test: The specimen was coated with a saturated mixed solution of NaCl and Na2SO4 with a mass ratio of 1:3. The salt coating amount was determined by weighing before and after, and the salt amount was controlled at about 3.0 mg / cm 2 . Then it was placed in a high-temperature furnace and corroded under the same temperature conditions. One or several specimens were taken out at different times, cooled and weighed. The experimental time was 20 h and the temperature was 800 °C. The porcelain boat was taken out and weighed using an electronic analytical balance (sensitivity 0.1 mg) respectively to measure the mass change of the specimen during oxidation.

[0284] (6) Interlayer bonding strength: The cross-section delamination of the sample after the hot corrosion test was observed by SEM.

[0285] Taking the ideal embodiments of the present invention described above as inspiration, through the above description, relevant staff can completely make various changes and modifications without departing from the technical idea of this invention. The technical scope of this invention is not limited to the content in the specification, and its technical scope must be determined according to the scope of the claims.

Claims

1. A high-temperature corrosion-resistant nickel alloy spraying material, characterized in that: It includes an inner layer material and an outer layer material; the inner layer material and the outer layer material are used in combination; the inner layer material includes a mixture of component A and component B; the outer layer material includes a mixture of component A and component B; component A is a ceramic material; component B is a nickel-chromium-based powder.

2. The high-temperature corrosion-resistant nickel alloy spraying material according to claim 1, characterized in that: The ceramic material is selected from one or more of alumina, zirconia, molybdenum boride, and chromium boride.

3. The high-temperature corrosion-resistant nickel alloy spraying material according to claim 1, characterized in that: The nickel-chromium-based powder includes the following raw materials in parts by weight: Cr: 30.0 - 35.0%, Ti: 0.6 - 3.0%, Al: 3.0 - 5.0%, Fe: 0.3 - 0.5%, Nb: 1.0 - 3.0%, Mn: <0.2%, RE: <0.35%, S: <0.015%, P: <0.02%, C: <0.10%, with the balance being Ni.

4. The high-temperature corrosion-resistant nickel alloy spraying material according to claim 3, characterized in that: The RE is selected from Y, Ce, Gd, or Sm.

5. The high-temperature corrosion-resistant nickel alloy spraying material according to claim 3 or 4, characterized in that: The content of the RE is not less than 0.25%.

6. The high-temperature corrosion-resistant nickel alloy spraying material according to claim 1, characterized in that: The particle size of component A is 0.05 - 1.0 μm; the particle size of component B is 5 - 30 μm.

7. A preparation method of a high-temperature corrosion-resistant nickel alloy spraying material, characterized in that: Component A and component B are respectively added to absolute ethanol, magnetically stirred at 500 - 2000 r / min for 2 - 5 h, then placed in an ultrasonic treatment at 50 KHz for 2 h to obtain an absolute ethanol suspension; filtered, the insoluble matter is taken and placed in a drying oven at 80 °C for drying treatment for 2 h to obtain a high-temperature corrosion-resistant nickel alloy spraying material.

8. The preparation method of a high-temperature corrosion-resistant nickel alloy spraying material according to claim 7, characterized in that: The dosage ratio of component A, component B, and absolute ethanol is 30 - 80 g: 20 - 70 g: 500 mL; among them, the total weight of component A and component B is 100 g.

9. The preparation method of a high-temperature corrosion-resistant nickel alloy spraying material according to claim 7 or 8, characterized in that: The dosage ratio of component A, component B, and absolute ethanol is 60 - 80 g: 20 - 40 g: 500 mL; among them, the total weight of component A and component B is 100 g, which constitutes the inner layer material of the high-temperature corrosion-resistant nickel alloy spraying.

10. The preparation method of a high-temperature corrosion-resistant nickel alloy spraying material according to claim 7 or 8, characterized in that: The dosage ratio of component A, component B, and absolute ethanol is 30 - 50 g: 50 - 70 g: 500 mL; among them, the total weight of component A and component B is 100 g, which constitutes the outer layer material of the high-temperature corrosion-resistant nickel alloy spraying.

11. A coating prepared from a high-temperature corrosion-resistant nickel alloy spraying material, characterized in that: It includes the following steps: S1: Surface pretreatment of the nickel alloy substrate: Place the substrate in a beaker containing degreasing liquid and degrease it in an ultrasonic field; then put it into a sandblaster for roughening; then put it into the ultrasonic field again for cleaning. S2: Spraying: Preheat the pretreated nickel alloy substrate, and use an atmospheric plasma spraying device for spraying. First, spray the inner layer material on the surface of the nickel alloy substrate, then heat it, and spray the outer layer material to obtain a coating prepared from the high-temperature corrosion-resistant nickel alloy spraying material. S3: Heat treatment: Vacuum heat-treat the sprayed nickel alloy and perform gas quenching.

12. The coating prepared from a high-temperature corrosion-resistant nickel alloy spraying material according to claim 11, characterized in that: In S2, the pretreated nickel alloy substrate is preheated to 150 - 200 °C, after spraying the inner layer material, it is heated to 250 - 350 °C, then the outer layer material is sprayed, and it is heated to 450 - 550 °C and cooled to room temperature to obtain a coating prepared from the high-temperature corrosion-resistant nickel alloy spraying material.

13. The coating prepared from a high-temperature corrosion-resistant nickel alloy spraying material according to claim 11, characterized in that: In S2, the spraying thickness of the inner layer material is 100 - 150 μm; the spraying thickness of the outer layer material is 150 - 200 μm.

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