CN114075665A - NiSiAlY coating on surface of titanium alloy and preparation method thereof - Google Patents
NiSiAlY coating on surface of titanium alloy and preparation method thereof Download PDFInfo
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- 238000000576 coating method Methods 0.000 title claims abstract description 106
- 239000011248 coating agent Substances 0.000 title claims abstract description 105
- 229910001069 Ti alloy Inorganic materials 0.000 title claims abstract description 34
- 238000002360 preparation method Methods 0.000 title claims abstract description 11
- 238000000034 method Methods 0.000 claims abstract description 31
- 230000003647 oxidation Effects 0.000 claims abstract description 27
- 238000007254 oxidation reaction Methods 0.000 claims abstract description 27
- 238000010288 cold spraying Methods 0.000 claims abstract description 25
- 238000005507 spraying Methods 0.000 claims abstract description 22
- 238000000137 annealing Methods 0.000 claims abstract description 21
- 239000011159 matrix material Substances 0.000 claims abstract description 13
- 239000011812 mixed powder Substances 0.000 claims abstract description 6
- 239000000843 powder Substances 0.000 claims description 77
- 229910052751 metal Inorganic materials 0.000 claims description 27
- 239000002184 metal Substances 0.000 claims description 27
- 239000007789 gas Substances 0.000 claims description 21
- 238000010438 heat treatment Methods 0.000 claims description 21
- 239000000758 substrate Substances 0.000 claims description 17
- 239000011863 silicon-based powder Substances 0.000 claims description 12
- 239000002245 particle Substances 0.000 claims description 8
- 229910052782 aluminium Inorganic materials 0.000 claims description 7
- 238000001035 drying Methods 0.000 claims description 7
- 229910052759 nickel Inorganic materials 0.000 claims description 7
- 230000001788 irregular Effects 0.000 claims description 6
- 229910052710 silicon Inorganic materials 0.000 claims description 6
- 239000007921 spray Substances 0.000 claims description 6
- 239000012159 carrier gas Substances 0.000 claims description 4
- 238000001291 vacuum drying Methods 0.000 claims description 4
- 229910052727 yttrium Inorganic materials 0.000 claims description 4
- 238000002156 mixing Methods 0.000 claims description 3
- 239000000203 mixture Substances 0.000 claims description 2
- 238000007781 pre-processing Methods 0.000 claims 1
- 229910001151 AlNi Inorganic materials 0.000 abstract description 2
- 230000001590 oxidative effect Effects 0.000 abstract 1
- 239000002131 composite material Substances 0.000 description 8
- 238000001816 cooling Methods 0.000 description 7
- 229910045601 alloy Inorganic materials 0.000 description 6
- 239000000956 alloy Substances 0.000 description 6
- 239000000463 material Substances 0.000 description 6
- 230000004584 weight gain Effects 0.000 description 6
- 235000019786 weight gain Nutrition 0.000 description 6
- 238000002441 X-ray diffraction Methods 0.000 description 5
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 description 4
- 125000004122 cyclic group Chemical group 0.000 description 4
- 230000007797 corrosion Effects 0.000 description 3
- 238000005260 corrosion Methods 0.000 description 3
- 230000001681 protective effect Effects 0.000 description 3
- 150000003839 salts Chemical class 0.000 description 3
- 230000015572 biosynthetic process Effects 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 238000005488 sandblasting Methods 0.000 description 2
- 239000011780 sodium chloride Substances 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 238000002083 X-ray spectrum Methods 0.000 description 1
- 238000005275 alloying Methods 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000003889 chemical engineering Methods 0.000 description 1
- QDOXWKRWXJOMAK-UHFFFAOYSA-N chromium(III) oxide Inorganic materials O=[Cr]O[Cr]=O QDOXWKRWXJOMAK-UHFFFAOYSA-N 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 238000005272 metallurgy Methods 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 125000004430 oxygen atom Chemical group O* 0.000 description 1
- 238000004806 packaging method and process Methods 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 238000004321 preservation Methods 0.000 description 1
- 239000006104 solid solution Substances 0.000 description 1
- 239000012720 thermal barrier coating Substances 0.000 description 1
- 238000012876 topography Methods 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C24/00—Coating starting from inorganic powder
- C23C24/02—Coating starting from inorganic powder by application of pressure only
- C23C24/04—Impact or kinetic deposition of particles
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C19/00—Alloys based on nickel or cobalt
- C22C19/03—Alloys based on nickel or cobalt based on nickel
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22F—CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
- C22F1/00—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
- C22F1/10—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of nickel or cobalt or alloys based thereon
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22F—CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
- C22F1/00—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
- C22F1/16—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of other metals or alloys based thereon
- C22F1/18—High-melting or refractory metals or alloys based thereon
- C22F1/183—High-melting or refractory metals or alloys based thereon of titanium or alloys based thereon
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Other Surface Treatments For Metallic Materials (AREA)
- Coating By Spraying Or Casting (AREA)
Abstract
The invention belongs to the technical field of surfaces, and particularly relates to a NiSiAlY coating on a titanium alloy surface and a preparation method thereof. And spraying the uniformly mixed powder on the surface of the matrix by adopting a low-pressure cold spraying method to prepare the NiSiAlY coating with the thickness of 500-900 microns. Finally, annealing the prepared sample, and after annealing, the bonding force is good, the porosity is reduced, and Al is generated3Ni2AlNi and Ni17Si3An intermediate phase; after oxidizing for 200h at 1150 ℃, the coating is not completely oxidized and is only generated on the surface of the coatingA thinner layer of oxide. Compared with a titanium alloy matrix, the NiSiAlY coating has better high-temperature oxidation resistance, and can well solve the high-temperature oxidation problem of the titanium alloy.
Description
Technical Field
The invention belongs to the technical field of surfaces, and particularly relates to a NiSiAlY coating on the surface of a titanium alloy and a preparation method thereof.
Background
Titanium alloy is an important structural metal developed in the last 50 th century, has very excellent physical and mechanical properties such as low density, high specific strength and corrosion resistance, and has been widely applied to the fields of aviation, aerospace, petroleum, chemical engineering, metallurgy and the like. However, titanium alloy has certain disadvantages, such as rapid decrease of oxidation resistance and corrosion resistance at high temperature, formation of oxides without protective effect on the surface of the alloy, formation of a brittle oxygen-rich layer due to solid solution of a large number of oxygen atoms in a matrix below the oxide layer, serious damage to the mechanical properties of the alloy, and influence on the use of the titanium alloy.
NiCrAlY alloys have good ductility, high temperature strength, and excellent high temperature oxidation and corrosion resistance, and are commonly used as tie layer materials in thermal barrier coatings for hot end components of aircraft or turbine engines. The coating surface can generate continuous and compact Al in a high-temperature environment2O3And Cr2O3And (4) an oxide protective film. With the rapid development of ocean engineering, more and more materials need to be used in severe ocean salt fog environment. Al (Al)2O3Gibbs free energy of reaction with NaCl and water is positive, so that the reaction is difficult to occur, and the integrity of an oxide film can be maintained; and Cr of the surface2O3The oxide protective film can react with NaCl and water within the temperature range of 400-700 ℃, and is peeled off in a high-temperature salt spray environment, so that parts of the aircraft engine fail. In order to improve the service life of the coating in the ocean salt spray environment, the replacement of Cr by other alloying elements (such as Si, Mo, Cu and the like) is one of effective methods.
Disclosure of Invention
The invention provides a NiSiAlY coating prepared by cold spraying on the surface of a titanium alloy, and the coating has better high-temperature oxidation resistance.
The invention adopts the following technical scheme:
the preparation method of the Ni-based alloy coating for the high-surface high-temperature protection of the titanium alloy comprises the steps of firstly carrying out sand blasting pretreatment on the surface of a matrix, then uniformly mixing Ni powder, Si powder, Al powder and Y powder according to the mass ratio, then placing the mixture in a vacuum drying box for drying, then spraying the mixed powder on the surface of the titanium alloy matrix by adopting a cold spraying method, and then carrying out annealing heat treatment on the sprayed sample.
Wherein the cold spraying powder comprises the following components in percentage by mass: 64.4-79.4% of Ni powder, 10-20% of Si powder, 10-15% of Al powder and 0.6% of Y powder.
Mixing Ni, Si, Al and Y metal powder, drying in a vacuum drying oven, and vacuumizing to 10%-1～10- 2Pa, setting the drying temperature to be 60 ℃ and setting the drying time to be 3-4 hours.
The particle size of the Ni and Al metal powder is 20-30 mu m, and the shape of the Ni and Al metal powder is spherical or irregular; the particle size of the Si and Y metal powder is 50-60 μm, and the shape is spherical or irregular.
When the mixed powder is sprayed on the surface of the titanium alloy substrate by adopting a cold spraying method, the working gas is compressed air, the carrier gas temperature is 400-600 ℃, the powder feeding speed is 40-60 g/min, the carrier gas pressure is 0.8-1.2 MPa, the spraying distance is 12-15 mm, and the relative moving speed of the spray gun and the substrate is 8-10 mm/s.
Annealing the sprayed coating at 500 ℃ for 12-120 hours, and air-cooling to generate Al3Ni2AlNi and Ni17Si3An intermediate phase.
The Ni-based alloy coating for titanium alloy high-temperature protection prepared by the method has the thickness of 500-900 microns.
The NiAlSiY coating prepared by the cold spraying process method has better high-temperature oxidation resistance compared with the existing coating. Compared with the existing preparation process, the cold spraying process can not generate the conditions of melting, phase change, oxidation and the like, and the prepared coating keeps the properties of the original material. And the preparation temperature is far lower than the phase transition temperature of the titanium alloy, and the original matrix cannot be influenced. The properties of the coating can be enhanced by controlling the subsequent annealing heat treatment parameters (different temperatures and times) to produce the desired phase structure. Compared with the coating prepared by the prior art, the coating prepared by the invention has longer service life.
The matrix which can be processed by the cold spraying process is not limited by the size of the coating preparation equipment, and the coating can be prepared by performing the spraying process on the surface of the equipment with large area and large volume. The thickness of the prepared coating can be controlled by adjusting parameters, the thickness is selected to be the common thickness of the coating, and the thickness can be controlled to reach the millimeter level if necessary. The cold spraying process is simple to operate and has no potential safety hazard problem. In the coating preparation process, the base material is not required to be chemically treated, and environmental pollution and potential safety hazard are avoided.
Compared with the prior art, the invention has the following beneficial effects:
(1) the coating designed by the invention has better high-temperature oxidation resistance.
(2) The invention adopts the cold spraying process method to prepare the target coating, and the process is simple.
(3) The heat treatment of the coating at the temperature generates a mesophase, the performance of the coating is enhanced, and the performance of the matrix is not influenced.
Description of the drawings:
FIG. 1 is a cross-sectional profile of a NiSiAlY coating of example 2 without an annealing heat treatment.
FIG. 2 is a cross-sectional profile of the NiSiAlY coating after heat treatment, wherein, a-g are cross-sectional profiles of the coatings of example 1, example 3 and example 8.
Fig. 3 is an X-ray diffraction pattern of the coating surface, wherein a is an X-ray diffraction pattern of the non-annealed coating surface of example 2, and b is an X-ray diffraction pattern of the annealed coating surface of example 1.
FIG. 4 is a cross-sectional topography of the NiSiAlY coating after the cyclic oxidation behavior of the coating of example 1.
FIG. 5 is an X-ray spectrum of the NiSiAlY coating surface after the cyclic oxidation behavior of the coating of example 1.
FIG. 6 is a graph of 200 hour oxidation kinetics at 1150 ℃ for the NiSiAlY coating of example 1.
Detailed Description
In a specific embodiment, the invention selects the following raw powder materials: the purity of the Ni and Al metal powder with the particle size of 20-30 mu m is 99.9 percent, and the shape of the powder particles is spherical or irregular; the purity of the Si and Y metal powder with the powder particle size of 50-60 mu m is 99.9%, and the shape of the powder particles is spherical or irregular.
The metal powders were mixed uniformly according to the proportions in table 1, mechanically, for 60 minutes. Then putting the uniformly mixed powder into a vacuum drying oven for drying, and vacuumizing to 10 DEG-1Pa above, the drying temperature is set to 60 ℃, and the time is set to 3-4 hours.
The titanium alloy substrate is pretreated by sand blasting before cold spraying, oil stains and oxide scales on the surface of the substrate are removed, and the roughness of the surface of the substrate is enhanced to improve the binding force between the coating and the substrate.
And putting the dried powder into a powder conveying barrel of a cold spraying system, wherein the powder conveying amount is set to be 40-60 g/min. The high-pressure gas for cold spraying adopts compressed air, the gas pressure is 0.8-1.2 MPa, and the gas heating temperature is 500 ℃. The distance between the spray gun and the surface of the substrate is set to be 12-15 mm, and the relative movement speed of the spray gun is 8-10 mm/s. The coating prepared by adopting the powder and the process parameters is a NiSiAlY coating, and the thickness of the coating is 600-900 mu m.
And (3) placing the prepared sample into a tube furnace in a packaging vacuum mode for annealing heat treatment, wherein the temperature is set to be 500 ℃, and the heat preservation time is set to be 12-120 hours. Then taking out and cooling to room temperature.
Example 1
The mixed metal powder comprises the following components in percentage by weight: 79.4% of Ni powder, 10% of Si powder, 10% of Al powder and 0.6% of Y powder. Compressed air is selected as working gas, the gas pressure is 0.99MPa, the powder feeding amount is 50g/min, the spraying temperature is 500 ℃, the spraying distance is 12mm, and the relative moving speed is 10 mm/s. And preparing the NiSiAlY composite metal coating on the surface of the TC4 titanium alloy substrate by adopting a cold spraying process. Then placed in 5Annealing heat treatment is carried out at 00 ℃ for 12 hours, and then the coating is taken out and air-cooled to room temperature, as shown in fig. 2(a), the porosity of the coating after annealing heat treatment is low, and the binding force is good. As shown in FIG. 4, the coating is not completely oxidized after being oxidized for 200h at 1150 ℃, only a thin layer of oxide is generated on the surface of the coating, and the coating still has the oxidation resistance. As shown in fig. 6, the TC4 matrix oxidation weight gain rate was faster, indicating that the matrix alloy did not resist oxidation attack well during high temperature oxidation; the weight gain rate of the NiSiAlY coating is much slower than that of the TC4 titanium alloy, and the coating can greatly slow down the oxidation process of the TC4 titanium alloy matrix, which shows that the coating has better high-temperature oxidation resistance. The weight gain of the coating prepared in the embodiment after isothermal cyclic oxidation at 1150 ℃ for 200 hours is 1.84mg/cm2。
TABLE 1 original powder materials proportioning Table
Example 2
The mixed metal powder comprises the following components in percentage by weight: 79.4% of Ni powder, 10% of Si powder, 10% of Al powder and 0.6% of Y powder. Compressed air is selected as working gas, the gas pressure is 0.99MPa, the powder feeding amount is 50g/min, the spraying temperature is 500 ℃, the spraying distance is 12mm, and the relative moving speed is 10 mm/s. And preparing the NiSiAlY composite metal coating on the surface of the TC4 titanium alloy substrate by adopting a cold spraying process. As shown in fig. 1, the cohesion of the coating is good and the coating can be seen to be formed entirely by powder impact stacking. As shown in FIG. 3(a), the XRD pattern of the coating contains only three single elements of Ni, Al and Si (the content of Y is too small, the peak value of the XRD pattern is too low), and the coating does not contain a phase structure with high-temperature oxidation resistance. The weight gain of the coating prepared in the embodiment after isothermal cyclic oxidation at 1150 ℃ for 200 hours is 2.57mg/cm2。
Example 3
The mixed metal powder comprises the following components in percentage by weight: 79.4% of Ni powder, 10% of Si powder, 10% of Al powder and 0.6% of Y powder. Compressed air is selected as working gas, the gas pressure is 0.99MPa, and the powder feeding amount is 60g/min, the spraying temperature is 400 ℃, the spraying distance is 12mm, and the relative moving speed is 10 mm/s. And preparing the NiSiAlY composite metal coating on the surface of the TC4 titanium alloy substrate by adopting a cold spraying process. Then the coating is placed at 500 ℃ for annealing heat treatment for 12 hours, and then the coating is taken out for air cooling to room temperature, as shown in fig. 2(b), the porosity of the coating after annealing heat treatment is high, and the binding force is good. Experimental results show that the coating prepared by the embodiment has better high-temperature oxidation resistance. The weight of the coating is increased to 1.96mg/cm after the coating is oxidized for 200 hours at 1150 ℃ in an isothermal circulation manner2。
Example 4
The mixed metal powder comprises the following components in percentage by weight: 79.4% of Ni powder, 10% of Si powder, 10% of Al powder and 0.6% of Y powder. Compressed air is selected as working gas, the gas pressure is 0.99MPa, the powder feeding amount is 50g/min, the spraying temperature is 600 ℃, the spraying distance is 15mm, and the relative moving speed is 10 mm/s. And preparing the NiSiAlY composite metal coating on the surface of the TC4 titanium alloy substrate by adopting a cold spraying process. Then, the coating is placed at 500 ℃ for annealing heat treatment for 12 hours, and then the coating is taken out for air cooling to room temperature, as shown in fig. 2(c), the porosity of the coating after annealing heat treatment is low, and the binding force is poor. Experimental results show that the coating prepared by the embodiment has better high-temperature oxidation resistance. The weight of the coating is increased to 1.93mg/cm after the coating is oxidized for 200 hours at the temperature of 1150 ℃ in an isothermal circulation manner2。
Example 5
The mixed metal powder comprises the following components in percentage by weight: 74.4% of Ni powder, 10% of Si powder, 15% of Al powder and 0.6% of Y powder. Compressed air is selected as working gas, the gas pressure is 0.99MPa, the powder feeding amount is 50g/min, the spraying temperature is 500 ℃, the spraying distance is 12mm, and the relative moving speed is 10 mm/s. And preparing the NiSiAlY composite metal coating on the surface of the TC4 titanium alloy substrate by adopting a cold spraying process. Then the coating is placed at 500 ℃ for annealing heat treatment for 12 hours, and then the coating is taken out for air cooling to room temperature, as shown in fig. 2(d), the porosity of the coating after annealing heat treatment is low, and the binding force is good. Experimental results show that the coating prepared by the embodiment has better high-temperature oxidation resistance. The weight of the coating is increased to 1.92mg/cm after the coating is oxidized for 200 hours at 1150 ℃ in an isothermal cycle2。
Example 6
The mixed metal powder comprises the following components in percentage by weight: 74.4% of Ni powder, 10% of Si powder, 15% of Al powder and 0.6% of Y powder. Compressed air is selected as working gas, the gas pressure is 0.99MPa, the powder feeding amount is 50g/min, the spraying temperature is 500 ℃, the spraying distance is 12mm, and the relative moving speed is 10 mm/s. And preparing the NiSiAlY composite metal coating on the surface of the TC4 titanium alloy substrate by adopting a cold spraying process. Then, the coating is placed at 500 ℃ for annealing heat treatment for 120 hours, and then the coating is taken out for air cooling to room temperature, as shown in fig. 2(e), the porosity of the coating after annealing heat treatment is high, and the binding force is general. Phase experiment results show that the coating prepared by the embodiment has better high-temperature oxidation resistance. The weight of the coating is increased to 1.98mg/cm after the coating is oxidized for 200 hours at 1150 ℃ in an isothermal circulation manner2。
Example 7
The mixed metal powder comprises the following components in percentage by weight: 69.4% of Ni powder, 20% of Si powder, 10% of Al powder and 0.6% of Y powder. Compressed air is selected as working gas, the gas pressure is 0.99MPa, the powder feeding amount is 50g/min, the spraying temperature is 500 ℃, the spraying distance is 12mm, and the relative moving speed is 10 mm/s. And preparing the NiSiAlY composite metal coating on the surface of the TC4 titanium alloy substrate by adopting a cold spraying process. Then the coating is placed at 500 ℃ for annealing heat treatment for 12 hours, and then the coating is taken out for air cooling to room temperature, as shown in fig. 2(f), the porosity of the coating after annealing heat treatment is low, and the binding force is good. Experimental results show that the coating prepared by the embodiment has better high-temperature oxidation resistance. The weight gain of the coating after being oxidized for 200 hours in an isothermal cycle at 1150 ℃ is 1.89mg/cm2。
Example 8
The mixed metal powder comprises the following components in percentage by weight: 64.4% of Ni powder, 20% of Si powder, 15% of Al powder and 0.6% of Y powder. Compressed air is selected as working gas, the gas pressure is 0.99MPa, the powder feeding amount is 50g/min, the spraying temperature is 500 ℃, the spraying distance is 12mm, and the relative moving speed is 10 mm/s. And preparing the NiSiAlY composite metal coating on the surface of the TC4 titanium alloy substrate by adopting a cold spraying process. Then, the resultant was left at 500 ℃ for annealing heat treatment for 12 hours, and then, taken out and air-cooled to room temperature, as shown in FIG. 2(g), to anneal the heat-treated coatingThe porosity is low and the binding force is good. Experimental results show that the coating prepared by the embodiment has better high-temperature oxidation resistance. The weight gain of the coating after being oxidized for 200 hours at the temperature of 1150 ℃ in an isothermal circulation way is 2.07mg/cm2。
Claims (6)
1. A preparation method of a NiSiAlY coating on the surface of a titanium alloy is characterized by comprising the following steps: the preparation method comprises the following steps: firstly, preprocessing the surface of a matrix, uniformly mixing Ni powder, Si powder, Al powder and Y powder according to the mass ratio, drying the mixture in a vacuum drying oven, and spraying the mixed powder on the surface of a titanium alloy matrix by adopting a cold spraying method to obtain a NiSiAlY coating; and then, carrying out annealing treatment on the prepared sample to obtain a coating with lower porosity and better high-temperature oxidation resistance.
2. The method for preparing the NiSiAlY coating on the surface of the titanium alloy according to claim 1, which is characterized in that: the cold spraying powder comprises the following components in percentage by mass: 64.4-79.4% of Ni powder, 10-20% of Si powder, 10-15% of Al powder and 0.6% of Y powder.
3. The method for preparing the NiSiAlY coating on the surface of the titanium alloy according to claim 1, which is characterized in that: cold spraying powder: the particle size of the Ni and Al metal powder is 20-30 mu m, and the shape of the Ni and Al metal powder is spherical or irregular; the particle size of the Si and Y metal powder is 50-60 μm, and the shape is spherical or irregular.
4. The method for preparing the NiSiAlY coating on the surface of the titanium alloy according to claim 1, which is characterized in that: when the mixed powder is sprayed on the surface of the titanium alloy substrate by adopting a cold spraying method, the working gas is compressed air, the carrier gas temperature is 400-600 ℃, the powder feeding speed is 40-60 g/min, the carrier gas pressure is 0.8-1.2 MPa, the spraying distance is 12-15 mm, and the relative moving speed of the spray gun and the substrate is 8-10 mm/s.
5. The method for preparing the NiSiAlY coating on the surface of the titanium alloy according to claim 1, which is characterized in that: and carrying out annealing heat treatment on the prepared sample at 500 ℃ for 12-120 hours.
6. A titanium alloy surface NiSiAlY coating prepared by the method of claim 1, wherein: the thickness of the NiSiAlY coating is 500-900 mu m.
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| CN114686871A (en) * | 2022-03-30 | 2022-07-01 | 中国兵器科学研究院宁波分院 | Preparation method of biological porous coating based on powder oxygenation design |
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| CN101724301A (en) * | 2008-10-15 | 2010-06-09 | 中国科学院金属研究所 | MCrAlY+AlSiY composite coating and preparation technique thereof |
| EP2298962A1 (en) * | 2009-07-17 | 2011-03-23 | MTU Aero Engines AG | Cold spraying of oxide containing protective coatings |
| CN102179613A (en) * | 2011-03-08 | 2011-09-14 | 张昆 | Method for preparing welding layer and coating layer on surface of steel rail and soldering flux thereof |
| CN102828137A (en) * | 2012-08-31 | 2012-12-19 | 华南理工大学 | High-temperature alloy surface nanometer composite coating and preparation method thereof |
| CN111334759A (en) * | 2020-03-05 | 2020-06-26 | 广东省新材料研究所 | Application of diffusion barrier material, high-temperature coating, preparation method and application of high-temperature coating, and hot-end part of gas turbine |
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| CN114686871A (en) * | 2022-03-30 | 2022-07-01 | 中国兵器科学研究院宁波分院 | Preparation method of biological porous coating based on powder oxygenation design |
| CN114686871B (en) * | 2022-03-30 | 2023-07-25 | 中国兵器科学研究院宁波分院 | Preparation method of biological porous coating based on powder oxygenation design |
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