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CN-121976145-A - High-temperature-resistant and oxidation-resistant AlCoFeCr0.8Ni2Coating and preparation method thereof

CN121976145ACN 121976145 ACN121976145 ACN 121976145ACN-121976145-A

Abstract

The invention discloses a high-temperature-resistant and oxidation-resistant AlCoFeCr 0.8 Ni 2 coating and a preparation method thereof, belonging to the technical field of high-entropy alloy coatings. The preparation method comprises the steps of 1) spraying AlCoFeCr 0.8 Ni 2 alloy powder on the surface of a substrate plate subjected to sand blasting coarsening by adopting a plasma spraying process to obtain a AlCoFeCr 0.8 Ni 2 high-entropy alloy coating, 2) carrying out ultrasonic shot blasting on the surface of the obtained coating to obtain a compact and flat nanocrystallization layer on the surface, 3) carrying out heat treatment on the AlCoFeCr 0.8 Ni 2 coating subjected to treatment in the step 2) at 780-880 ℃, carrying out phase transition on the coating to convert the coating into a single-phase FCC structure, and pre-oxidizing the surface of the coating to generate theta-Al 2 O 3 to obtain the high-temperature-resistant and oxidation-resistant high-entropy alloy coating. The coating obtained by the invention has good surface compactness and interface bonding performance, excellent high-temperature resistance and oxidation resistance, low cost and low energy consumption, and has important application prospect.

Inventors

  • ZHAO ZONGHE
  • WANG CHAO
  • HUANG YAOHE
  • MO ZHILIN
  • BAI XIAOLIANG
  • WU YONGGANG
  • SUN JIANJUN
  • ZHU QIANG
  • ZHU TONG

Assignees

  • 武汉一冶钢结构有限责任公司

Dates

Publication Date
20260505
Application Date
20260115

Claims (10)

  1. 1. The preparation method of the high-temperature-resistant and oxidation-resistant AlCoFeCr 0.8 Ni 2 coating is characterized by comprising the following steps of: 1) Spraying AlCoFeCr 0.8 Ni 2 alloy powder on the surface of the substrate plate subjected to sand blasting roughening by adopting a plasma spraying process to obtain a AlCoFeCr 0.8 Ni 2 high-entropy alloy coating, wherein the molar ratio of Al, co, fe, cr to Ni in the AlCoFeCr 0.8 Ni 2 alloy powder is 1:0.98-1.02:0.98-1.02:0.78-0.82:1.98-2.02; 2) Carrying out ultrasonic shot blasting on the surface of the coating obtained in the step 1); 3) And (3) carrying out heat treatment on the coating subjected to the treatment in the step (2) at 780-880 ℃ to obtain the high-temperature-resistant and oxidation-resistant AlCoFeCr 0.8 Ni 2 coating.
  2. 2. The method according to claim 1, wherein in the step 1), the metal base plate is any one of nickel-base superalloy, iron-base superalloy, cobalt-base superalloy, iron-base structural steel and nickel-base structural steel.
  3. 3. The method according to claim 1, wherein in the step 1), the sand blasting roughening is specifically performed by alkali washing the surface of the metal base plate, and then performing surface sand blasting treatment until the surface has rough metallic luster.
  4. 4. The method according to claim 1, wherein in the step 1), the AlCoFeCr 0.8 Ni 2 alloy powder has a particle size of 14-43 μm, the spherical treatment is performed to obtain a spherical powder for spraying, and the surface roughness of the base plate after sand blasting roughening is Ra5.0 μm to Ra6.2 μm.
  5. 5. The method according to claim 1, wherein AlCoFeCr 0.8 Ni 2 and Jin Fencai in step 1) are obtained by vacuum gas atomization pulverizing of AlCoFeCr 0.8 Ni 2 bulk material obtained by arc melting.
  6. 6. The preparation method of the plasma spraying device according to claim 1, wherein in the step 1), the plasma spraying process parameters are 39-41V of working voltage, 510-580A of working current, 410-480mm/min of spraying speed, 160-220 mm of spraying distance, 7-10 mg/s of powder output quantity of a powder feeding pipe, 0.52-0.68 rad/min of powder feeding speed, 39-43 psi of powder feeding gas flow, 41-45 psi of protective gas flow, 7-10 psi of combustion supporting gas and 7-45 psi of gas flow.
  7. 7. The method according to claim 1, wherein in the step 2), the surface of the coating material is subjected to ultrasonic shot peening treatment by using 100-150 mesh stainless steel shot to shot peen the surface of the coating.
  8. 8. The method according to claim 1, wherein in the step 3), the heat-treatment holding time is 8-12 h, and the air cooling is performed after the heat treatment.
  9. 9. A high temperature resistant and oxidation resistant AlCoFeCr 0.8 Ni 2 coating prepared by the method of any one of claims 1-8.
  10. 10. The coating of claim 9, wherein the coating is resistant to failure at 900 ℃ to 1000 ℃ for 180h to 220 h.

Description

High-temperature-resistant and oxidation-resistant AlCoFeCr 0.8Ni2 coating and preparation method thereof Technical Field The invention belongs to the technical field of high-entropy alloy coatings, and particularly relates to a high-temperature-resistant and oxidation-resistant AlCoFeCr 0.8Ni2 coating and a preparation method thereof. Background The high-temperature alloy is commonly used in high-temperature gas environments such as aero-engine blades, ship engine combustion chambers, smelting furnace fan blades and the like. Aero-engine blades, marine engine combustors are also typically used at temperatures of 1000-1100 ℃. The maximum service temperature of the fan blade of the smelting furnace can reach 900 ℃. The service temperature of 900-1100 ℃ is higher than the long-term service temperature of most of the prior high-temperature alloys. At high temperatures, conventional iron-based and nickel-based superalloys have limited service temperatures that are insufficient to operate for long periods of time in such high temperature environments. The development of aerospace, marine and metallurgical industries has increasingly demanded materials with high temperature resistance, especially high temperature resistant coating materials. The thermal spraying high-temperature resistant coating can provide protection for the high-temperature use of the material on the premise of not affecting the mechanical property of the material, so that the mechanical part can stably operate at a higher temperature. Under the high-temperature environment, the oxidation is carried out from the surface to the inside, so that the surface of the high-temperature alloy material is protected, and the high-temperature performance of the high-temperature alloy can be effectively improved, so that the service temperature and the service time of the high-temperature alloy are improved. The preparation of the coating on the surface of the high-temperature alloy also has good economical efficiency, and compared with the development of new materials with both structural strength and high temperature resistance, the preparation of the coating directly on the surface of the existing mature high-temperature alloy can save a great deal of cost. It is known from the prior art that, in order to improve the high-temperature service performance of the material, the MCrAlY coating is mostly prepared by adopting thermal spraying, but the MCrAlY coating is promoted by Y to block oxidation by oxide, so that spinel oxide is easy to form to cause the coating to fail. And the substrate is partially protected by adopting a multilayer coating, the multilayer coating is mechanically combined, the self-combination property is poor, and the porosity is high. The increased porosity results in easier oxygen ingress, internal oxidation, spalling of the coating at high temperatures, and coating failure. Double-layer or multi-layer coating has certain difficulty in preparation and high cost. At present, how to improve the high-temperature resistant and oxidation resistance of the high-temperature alloy, reduce the manufacturing cost of the protective layer, and simultaneously ensure that the protective layer has better bonding strength, a denser surface layer and better high-temperature service performance. Disclosure of Invention In order to solve the technical problems, the invention provides the high-temperature-resistant and oxidation-resistant AlCoFeCr 0.8Ni2 coating and the preparation method thereof, and the obtained coating has good surface compactness and interface bonding performance, excellent high-temperature-resistant and oxidation-resistant performance, low cost and low energy consumption. In order to achieve the above purpose, the present invention is realized by the following technical scheme: The invention aims at providing a preparation method of a high-temperature-resistant and oxidation-resistant AlCoFeCr 0.8Ni2 coating, which comprises the following steps of: 1) Spraying AlCoFeCr 0.8Ni2 alloy powder on the surface of the substrate plate subjected to sand blasting roughening by adopting a plasma spraying process to obtain a AlCoFeCr 0.8Ni2 high-entropy alloy coating, wherein the molar ratio of Al, co, fe, cr to Ni in the AlCoFeCr 0.8Ni2 alloy powder is 1:0.98-1.02:0.98-1.02:0.78-0.82:1.98-2.02; 2) Carrying out ultrasonic shot blasting on the surface of the coating prepared by the plasma spraying obtained in the step 1) to obtain a compact and flat nanocrystallization layer on the surface; 3) And (3) carrying out heat treatment on the coating subjected to the treatment in the step (2) at 780-880 ℃, converting the phase of the coating into a single-phase FCC structure, and pre-oxidizing the surface of the coating to form theta-Al 2O3 to obtain the high-temperature-resistant and oxidation-resistant AlCoFeCr 0.8Ni2 coating. According to the above scheme, in the step 1), the metal matrix sheet material is any one of nickel-based superalloy, iron-