CN111270187B - Titanium-nickel alloy cavitation-resistant thermal spraying powder and method for preparing thermal spraying coating by using same - Google Patents
Titanium-nickel alloy cavitation-resistant thermal spraying powder and method for preparing thermal spraying coating by using same Download PDFInfo
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- CN111270187B CN111270187B CN202010176745.9A CN202010176745A CN111270187B CN 111270187 B CN111270187 B CN 111270187B CN 202010176745 A CN202010176745 A CN 202010176745A CN 111270187 B CN111270187 B CN 111270187B
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- 239000000843 powder Substances 0.000 title claims abstract description 67
- 238000007751 thermal spraying Methods 0.000 title claims abstract description 40
- 229910000990 Ni alloy Inorganic materials 0.000 title claims abstract description 35
- HZEWFHLRYVTOIW-UHFFFAOYSA-N [Ti].[Ni] Chemical compound [Ti].[Ni] HZEWFHLRYVTOIW-UHFFFAOYSA-N 0.000 title claims abstract description 35
- 239000011248 coating agent Substances 0.000 title claims abstract description 34
- 238000000576 coating method Methods 0.000 title claims abstract description 34
- 238000000034 method Methods 0.000 title claims abstract description 33
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 claims abstract description 60
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 claims abstract description 48
- 239000010936 titanium Substances 0.000 claims abstract description 39
- 229910052719 titanium Inorganic materials 0.000 claims abstract description 39
- 229910045601 alloy Inorganic materials 0.000 claims abstract description 37
- 239000000956 alloy Substances 0.000 claims abstract description 37
- 229910001000 nickel titanium Inorganic materials 0.000 claims abstract description 35
- 239000011159 matrix material Substances 0.000 claims abstract description 29
- 230000007704 transition Effects 0.000 claims abstract description 24
- 239000013078 crystal Substances 0.000 claims abstract description 13
- 239000002245 particle Substances 0.000 claims abstract description 10
- 230000032683 aging Effects 0.000 claims description 15
- 238000004372 laser cladding Methods 0.000 claims description 15
- 238000005516 engineering process Methods 0.000 claims description 13
- 230000035882 stress Effects 0.000 claims description 12
- 238000005728 strengthening Methods 0.000 claims description 9
- 238000010438 heat treatment Methods 0.000 claims description 7
- 238000005496 tempering Methods 0.000 claims description 7
- 238000005422 blasting Methods 0.000 claims description 6
- 239000002131 composite material Substances 0.000 claims description 6
- 239000007921 spray Substances 0.000 claims description 6
- 238000004381 surface treatment Methods 0.000 claims description 6
- 229910001566 austenite Inorganic materials 0.000 claims description 5
- 238000007254 oxidation reaction Methods 0.000 claims description 4
- UFGZSIPAQKLCGR-UHFFFAOYSA-N chromium carbide Chemical compound [Cr]#C[Cr]C#[Cr] UFGZSIPAQKLCGR-UHFFFAOYSA-N 0.000 claims description 3
- 238000004140 cleaning Methods 0.000 claims description 3
- 239000011261 inert gas Substances 0.000 claims description 3
- 230000003647 oxidation Effects 0.000 claims description 3
- 238000005488 sandblasting Methods 0.000 claims description 3
- 229910003470 tongbaite Inorganic materials 0.000 claims description 3
- 229910000734 martensite Inorganic materials 0.000 claims description 2
- 239000010410 layer Substances 0.000 description 37
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 13
- 239000000463 material Substances 0.000 description 8
- 230000003628 erosive effect Effects 0.000 description 6
- 238000005299 abrasion Methods 0.000 description 5
- 230000007797 corrosion Effects 0.000 description 5
- 238000005260 corrosion Methods 0.000 description 5
- 239000000758 substrate Substances 0.000 description 5
- 229910052759 nickel Inorganic materials 0.000 description 4
- 238000005507 spraying Methods 0.000 description 4
- 238000012986 modification Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 230000006378 damage Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000013049 sediment Substances 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 238000003466 welding Methods 0.000 description 2
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 description 1
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 238000005275 alloying Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000005253 cladding Methods 0.000 description 1
- 230000001427 coherent effect Effects 0.000 description 1
- 238000013016 damping Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 239000012895 dilution Substances 0.000 description 1
- 238000010790 dilution Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000013505 freshwater Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000008239 natural water Substances 0.000 description 1
- 230000007935 neutral effect Effects 0.000 description 1
- 238000002161 passivation Methods 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 239000002244 precipitate Substances 0.000 description 1
- 239000011253 protective coating Substances 0.000 description 1
- 239000011241 protective layer Substances 0.000 description 1
- 238000007712 rapid solidification Methods 0.000 description 1
- 230000035939 shock Effects 0.000 description 1
- 238000005480 shot peening Methods 0.000 description 1
- OGIDPMRJRNCKJF-UHFFFAOYSA-N titanium oxide Inorganic materials [Ti]=O OGIDPMRJRNCKJF-UHFFFAOYSA-N 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
- 230000003313 weakening effect Effects 0.000 description 1
Classifications
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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
- C23C4/00—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge
- C23C4/12—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge characterised by the method of spraying
-
- B22F1/0003—
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F1/00—Metallic powder; Treatment of metallic powder, e.g. to facilitate working or to improve properties
- B22F1/17—Metallic particles coated with metal
-
- 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
- C23C24/08—Coating starting from inorganic powder by application of heat or pressure and heat
- C23C24/10—Coating starting from inorganic powder by application of heat or pressure and heat with intermediate formation of a liquid phase in the layer
- C23C24/103—Coating with metallic material, i.e. metals or metal alloys, optionally comprising hard particles, e.g. oxides, carbides or nitrides
- C23C24/106—Coating with metal alloys or metal elements only
-
- 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
- C23C4/00—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge
- C23C4/04—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge characterised by the coating material
- C23C4/06—Metallic material
- C23C4/08—Metallic material containing only metal elements
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/25—Process efficiency
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Physics & Mathematics (AREA)
- Plasma & Fusion (AREA)
- Coating By Spraying Or Casting (AREA)
Abstract
The application discloses titanium-nickel alloy cavitation-resistant thermal spraying powder and a method for preparing a thermal spraying coating, which belong to the technical field of surface engineering, 58% of nickel-titanium alloy powder and 42% of titanium-coated nickel powder are adopted to prepare a titanium-nickel alloy cavitation-resistant thermal spraying powder working layer, a layer of titanium-coated nickel powder transition layer with the thickness of 10 mu m-2mm is arranged between the working layer and a matrix, so that the bonding strength between the working layer and the matrix is enhanced, beta-phase structures in the nickel-titanium alloy powder are of a body-centered cubic structure, particle structures of the nickel-titanium alloy powder and the titanium-coated nickel powder are of spherical structures, slip systems in crystals are reduced by using the NiTi alloy beta-phase structures of the body-centered cubic structure, the stress level of slip is improved, the alloy surface has good wear resistance, and the formed coating has high cavitation resistance and high bonding strength and is suitable for large-area use of hydraulic machinery.
Description
Technical Field
The application relates to the technical field of surface engineering, in particular to titanium-nickel alloy cavitation-resistant thermal spraying powder and a method for preparing a thermal spraying coating by using the same.
Background
In the running process of hydraulic machinery such as a water turbine, a water pump and the like, cavitation bubbles generated by rotation can cause serious cavitation abrasion phenomenon, damage is generated on the surface of mechanical materials, and then the efficiency of the hydraulic machinery is reduced and the power is reduced. Besides cavitation erosion caused by cavitation, sediment erosion also causes abrasion failure of an overcurrent part, so that the machine set is forced to be stopped for overhaul after running for a period of time, and huge waste of resources and energy sources and economic loss are brought.
In order to improve the capability of the water turbine flow passage component for resisting the abrasion of sediment, a layer of protective layer is formed on the surface of the water turbine by adopting a spray welding technology, and a certain effect is achieved, but a plurality of difficulties are brought to the technology for enhancing the abrasion resistance of the water turbine flow passage surface due to the complex curve of the water turbine flow passage surface and the various abrasion damage factors of the water turbine; because of the complexity of the blade shape of the water turbine, the thickness of the workpiece and the like, the blade heating process is difficult; and the stress distribution condition of the blades is complex, so that the blades deform after the water turbine is subjected to temperature rise and fall. Therefore, the adoption of the spray welding technology for carrying out protective coating on the water turbine (particularly the large and medium-sized water turbine) has a plurality of technical difficulties which cannot be overcome.
The laser cladding technology is a brand new surface strengthening technology, and is a technological method for placing a selected coating material on the surface of a coated substrate, carrying out laser irradiation to enable the selected coating material and a thin layer on the surface of the substrate to be melted simultaneously, and forming a surface coating which has extremely low dilution and is metallurgically bonded with the substrate material after rapid solidification, thereby obviously improving the wear resistance, corrosion resistance and the like of the surface of the substrate material.
Disclosure of Invention
The application provides titanium-nickel alloy cavitation-resistant thermal spraying powder and a method for preparing a thermal spraying coating by using a NiTi alloy beta-phase structure with a body-centered cubic structure, so that a sliding system in a crystal is reduced, the stress level of sliding is improved, the surface of the alloy has good wear resistance, and the formed coating has high cavitation resistance, high erosion resistance and high bonding strength and is suitable for large-area use of hydraulic machinery.
The specific technical scheme provided by the application is as follows:
in one aspect, the titanium-nickel alloy cavitation-resistant thermal spraying powder provided by the application comprises 58% of nickel-titanium alloy powder and 42% of titanium-coated nickel powder, wherein the ratio of nickel atoms to titanium atoms in the nickel-titanium alloy powder is 1:1, the ratio of titanium atoms to nickel atoms in the titanium-coated nickel powder is 2:1, the beta phase structure in the nickel-titanium alloy powder is in a body-centered cubic structure, and the particle structures of the nickel-titanium alloy powder and the titanium-coated nickel powder are both in spherical structures.
Optionally, the nickel powder particle size in the nickel-titanium alloy powder is smaller than 48 microns, the titanium powder particle size is smaller than 147 microns, and the water content of the nickel-titanium alloy powder is lower than 10%.
Optionally, the titanium-coated nickel powder has a cubic crystal structure, the ratio of the austenite phase in the coating formed by the titanium-nickel alloy anti-cavitation thermal spraying powder is more than 80%, the elongation of the titanium-nickel alloy anti-cavitation thermal spraying powder is more than 40%, and the yield strength of the titanium-nickel alloy anti-cavitation thermal spraying powder is more than 500MPa.
In another aspect, the application provides a method for preparing a thermal spray coating from titanium-nickel alloy anti-cavitation thermal spray powder, comprising:
(1) Pretreating the surface of an alloy matrix to be treated, wherein the pretreatment comprises cleaning and sand blasting surface treatment, and performing mechanical shot blasting treatment after the surface treatment is finished so as to refine the crystal phase of the surface of the alloy matrix to be treated;
(2) Carrying out heat treatment on the surface of the alloy matrix to be treated, wherein the heat treatment comprises tempering and aging treatment, and the tempering and aging treatment reduces the surface stress of the alloy matrix to be treated and improves the bonding strength between the alloy matrix to be treated and the coating;
(3) Preparing a titanium-coated nickel powder transition layer with the thickness of 10 mu m-2mm on the surface of an alloy matrix to be treated by adopting an ultra-high speed laser cladding technology;
(4) Aging and shot blasting are carried out on the titanium-coated nickel powder transition layer; inert gas is adopted for protection in the aging treatment process to prevent oxidation of the titanium-coated nickel powder transition layer;
(5) And preparing a titanium-nickel alloy cavitation-resistant thermal spraying powder working layer on the surface of the titanium-coated nickel powder transition layer by adopting an ultra-high speed laser cladding technology.
Alternatively, a conical nozzle is used in the ultra-high speed laser cladding process, and the taper of the conical nozzle is 30 degrees.
Optionally, the method further comprises forming a surface composite strengthening layer with the thickness of 0.2mm on the surface of the titanium-nickel alloy cavitation-resistant thermal spraying powder working layer, wherein the surface composite strengthening layer is formed by coating chromium carbide hard alloy with nickel powder.
Optionally, the thickness ratio between the titanium-coated nickel powder transition layer and the titanium-nickel alloy cavitation-resistant thermal spraying powder working layer is 1:3.
The beneficial effects of the application are as follows:
the embodiment of the application provides titanium-nickel alloy cavitation-resistant thermal spraying powder and a method for preparing a thermal spraying coating by adopting 58% of nickel-titanium alloy powder and 42% of titanium-coated nickel powder to prepare a titanium-nickel alloy cavitation-resistant thermal spraying powder working layer, and arranging a 10-2 mm titanium-coated nickel powder transition layer between the working layer and a matrix, so that the bonding strength between the working layer and the matrix is enhanced, the beta phase structure in the nickel-titanium alloy powder is of a body-centered cubic structure, the particle structures of the nickel-titanium alloy powder and the titanium-coated nickel powder are of spherical structures, the sliding system in crystals is reduced by using the NiTi alloy beta phase structure of the body-centered cubic structure, the stress level of sliding is improved, the alloy surface has good wear resistance, and the formed coating has high cavitation resistance, high erosion resistance and high bonding strength and is suitable for large-area use of hydraulic machinery.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for the description of the embodiments will be briefly described below, and it is apparent that the drawings in the following description are only some embodiments of the present application, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic diagram of a powder feeding head used in a method for preparing a thermal spray coating by using titanium-nickel alloy anti-cavitation thermal spray powder according to an embodiment of the application.
Fig. 2 is a schematic diagram of an isometric structure of a powder delivery head used in a method for preparing a thermal spray coating using titanium-nickel alloy anti-cavitation thermal spray powder according to an embodiment of the present application.
Detailed Description
The present application will be described in further detail below in order to make the objects, technical solutions and advantages of the present application more apparent, and it is apparent that the described embodiments are only some embodiments of the present application, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.
The titanium-nickel alloy cavitation-resistant thermal spraying powder provided by the embodiment of the application comprises 58% of nickel-titanium alloy powder and 42% of titanium-coated nickel powder, wherein the ratio of nickel atoms to titanium atoms in the nickel-titanium alloy powder is 1:1, the ratio of titanium atoms to nickel atoms in the titanium-coated nickel powder is 2:1, the beta phase structure in the nickel-titanium alloy powder is of a body-centered cubic structure, the particle structures of the nickel-titanium alloy powder and the titanium-coated nickel powder are of spherical structures, the nickel-titanium alloy powder and the titanium-coated nickel powder of the spherical structures have good fluidity, the resistance in the powder flowing process can be reduced, the powder is prevented from being excessively heated and oxidized, and good coating surface quality can be realized by matching with an ultra-high-speed laser cladding technology. The particle size of nickel powder in the nickel-titanium alloy powder is less than 48 microns, the particle size of titanium powder is less than 147 microns, and the water content of the nickel-titanium alloy powder is less than 10%.
Further, the titanium-coated nickel powder in the titanium-nickel alloy anti-cavitation thermal spraying powder provided by the embodiment of the application has a cubic crystal structure, the ratio of austenite phase in a coating formed by the titanium-nickel alloy anti-cavitation thermal spraying powder is more than 80%, the extensibility of the titanium-nickel alloy anti-cavitation thermal spraying powder is more than 40%, and the yield strength of the titanium-nickel alloy anti-cavitation thermal spraying powder is more than 500MPa.
The nickel adopted in the titanium-nickel alloy cavitation-resistant thermal spraying powder provided by the embodiment of the application is a corrosion-resistant material, and the nickel can be used as an alloying element to be metallurgically melted with other metal elements in a quite large component range; the nickel can form a passivation film on the surface of the matrix, so that the corrosion resistance of the matrix in neutral, reducing and alkaline environments is improved, the chloride ion resistance and stress corrosion resistance of the matrix material are improved, and the coating formed by the nickel has strong corrosion resistance in natural water and fresh water; the beta phase structure in the nickel-titanium alloy powder is in a body-centered cubic structure, the slippage system in the body-centered cubic structure crystal is less, and the stress level of starting slippage is higher, so that the formed coating has good wear resistance; the nickel-titanium alloy powder precipitates a dispersed strengthening phase in the process of forming the coating, so that the matrix and the coating alloy keep a coherent relation and are not easy to peel off; the stress induced phase transition of the nickel-titanium alloy has reversibility, so that the ultimate elastic strain of the NiTi alloy is obviously improved, compared with the common alloy, the nickel-titanium alloy has high deformation capacity and high damping and shock absorption characteristics, and can effectively reduce vibration, impact resistance, cavitation resistance and fatigue resistance in the friction process.
On the other hand, the embodiment of the application also provides a method for preparing a thermal spraying coating by adopting the titanium-nickel alloy cavitation-resistant thermal spraying powder, which comprises the following steps:
(1) Pretreating the surface of an alloy matrix to be treated, wherein the pretreatment comprises cleaning and sand blasting surface treatment, and performing mechanical shot blasting treatment after the surface treatment is finished so as to refine the crystal phase of the surface of the alloy matrix to be treated; research shows that the finer the crystal grain of the material to be protected, the better the cavitation erosion resistance is, and the better the combination between the material and the coating is, so that the coating can be further prevented from falling off in the use process.
(2) Carrying out heat treatment on the surface of the alloy matrix to be treated, wherein the heat treatment comprises tempering and aging treatment, and the tempering and aging treatment reduces the surface stress of the alloy matrix to be treated and improves the bonding strength between the alloy matrix to be treated and the coating; tempering and aging can reduce the surface stress of the treated alloy matrix, and if the surface stress is too concentrated or too large, the coating is more likely to fall off in the later use process.
(3) Preparing a titanium-coated nickel powder transition layer with the thickness of 10 mu m-2mm on the surface of an alloy matrix to be treated by adopting an ultra-high speed laser cladding technology; a conical nozzle is adopted in the ultra-high speed laser cladding process, and the taper of the conical nozzle is 30 degrees. Wherein, the titanium-coated nickel powder can fully utilize the easy oxidization property of the titanium powder in the spraying process, and form a firm titanium oxide layer on the surface of the nickel powder, thereby improving the structural strength and the bonding property of the coating.
Through a great number of experiments and practices, the inventor of the application discovers that the coating prepared by the ultra-high-speed laser cladding technology of the embodiment of the application has better coating quality only when the taper of the conical nozzle of the embodiment of the application is 30 degrees after a plurality of failures. Applicants pay creative effort to find that no matter the included angle range is larger or smaller than the included angle range, the ultra-high-speed laser cladding process of the embodiment of the application can not ensure that the coating with better quality can be obtained.
(4) Aging and shot blasting are carried out on the titanium-coated nickel powder transition layer; inert gas is adopted for protection in the aging treatment process to prevent oxidation of the titanium-coated nickel powder transition layer; the aging treatment is carried out on the titanium-coated nickel powder transition layer, so that martensite in the titanium-coated nickel powder transition layer is gradually converted into austenite, and the higher the content of austenite in the transition layer is, the better the super-elasticity of the transition layer is, and further the working layer can be firmly fixed on the surface of a substrate to be treated. In addition, the shot peening strengthening treatment effectively eliminates the defects of the internal structure of the alloy, promotes the spheroidization process of the structure, refines alloy grains, improves fatigue strength, improves the mechanical property of the alloy, blocks the unlimited epitaxial growth of columnar crystals penetrating through the cladding layer along the forming height direction, and enables the interior of the alloy forming part to obtain a uniformly refined near equiaxed crystal structure, thereby weakening anisotropy.
(5) Preparing a titanium-nickel alloy cavitation-resistant thermal spraying powder working layer on the surface of the titanium-coated nickel powder transition layer by adopting an ultra-high speed laser cladding technology, wherein a conical nozzle is adopted in the ultra-high speed laser cladding process, and the taper of the conical nozzle is 30 degrees. Wherein, the thickness ratio between the titanium-coated nickel powder transition layer and the titanium-nickel alloy anti-cavitation thermal spraying powder working layer is 1:3.
(6) And forming a surface composite strengthening layer with the thickness of 0.2mm on the surface of the titanium-nickel alloy cavitation-resistant thermal spraying powder working layer, wherein the surface composite strengthening layer adopts nickel powder to coat chromium carbide hard alloy.
The embodiment of the application provides titanium-nickel alloy cavitation-resistant thermal spraying powder and a method for preparing a thermal spraying coating by adopting 58% of nickel-titanium alloy powder and 42% of titanium-coated nickel powder to prepare a titanium-nickel alloy cavitation-resistant thermal spraying powder working layer, and arranging a 10-2 mm titanium-coated nickel powder transition layer between the working layer and a matrix, so that the bonding strength between the working layer and the matrix is enhanced, the beta phase structure in the nickel-titanium alloy powder is of a body-centered cubic structure, the particle structures of the nickel-titanium alloy powder and the titanium-coated nickel powder are of spherical structures, the sliding system in crystals is reduced by using the NiTi alloy beta phase structure of the body-centered cubic structure, the stress level of sliding is improved, the alloy surface has good wear resistance, and the formed coating has high cavitation resistance, high erosion resistance and high bonding strength and is suitable for large-area use of hydraulic machinery.
It will be apparent to those skilled in the art that various modifications and variations can be made to the embodiments of the present application without departing from the spirit or scope of the embodiments of the application. Thus, if such modifications and variations of the embodiments of the present application fall within the scope of the claims and the equivalents thereof, the present application is also intended to include such modifications and variations.
Claims (2)
1. A method for preparing a thermal spraying coating by adopting titanium-nickel alloy anti-cavitation thermal spraying powder is characterized in that the titanium-nickel alloy anti-cavitation thermal spraying powder comprises 58% of nickel-titanium alloy powder and 42% of titanium-coated nickel powder, wherein the ratio of nickel atoms to titanium atoms in the nickel-titanium alloy powder is 1:1, the ratio of titanium atoms to nickel atoms in the titanium-coated nickel powder is 2:1, the beta-phase structure in the nickel-titanium alloy powder is of a body-centered cubic structure, and the particle structures of the nickel-titanium alloy powder and the titanium-coated nickel powder are of spherical structures;
the method comprises the following steps:
(1) Pretreating the surface of an alloy matrix to be treated, wherein the pretreatment comprises cleaning and sand blasting surface treatment, and performing mechanical shot blasting treatment after the surface treatment is finished so as to refine the crystal phase of the surface of the alloy matrix to be treated;
(2) Carrying out heat treatment on the surface of the alloy matrix to be treated, wherein the heat treatment comprises tempering and aging treatment, and the surface stress of the alloy matrix to be treated is reduced through tempering and aging treatment, so that the bonding strength between the alloy matrix to be treated and the coating is improved;
(3) Preparing a titanium-coated nickel powder transition layer with the thickness of 10 mu m-2mm on the surface of an alloy matrix to be treated by adopting an ultra-high speed laser cladding technology; wherein, a conical nozzle is adopted in the ultra-high speed laser cladding process, and the taper of the conical nozzle is 30 degrees;
(4) Aging and shot blasting are carried out on the titanium-coated nickel powder transition layer; the martensite in the titanium-coated nickel powder transition layer is gradually transformed into austenite through ageing treatment, and inert gas is adopted for protection in the ageing treatment process to prevent the oxidation of the titanium-coated nickel powder transition layer;
(5) Preparing a titanium-nickel alloy cavitation-resistant thermal spraying powder working layer on the surface of the titanium-coated nickel powder transition layer by adopting an ultra-high speed laser cladding technology; wherein, a conical nozzle is adopted in the ultra-high speed laser cladding process, and the taper of the conical nozzle is 30 degrees;
(6) And forming a surface composite strengthening layer with the thickness of 0.2mm on the surface of the titanium-nickel alloy cavitation-resistant thermal spraying powder working layer, wherein the surface composite strengthening layer adopts nickel powder to coat chromium carbide hard alloy.
2. The method of claim 1, wherein a thickness ratio between the titanium-clad nickel powder transition layer and the titanium-nickel alloy cavitation-resistant thermal spray powder working layer is 1:3.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010176745.9A CN111270187B (en) | 2020-03-13 | 2020-03-13 | Titanium-nickel alloy cavitation-resistant thermal spraying powder and method for preparing thermal spraying coating by using same |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010176745.9A CN111270187B (en) | 2020-03-13 | 2020-03-13 | Titanium-nickel alloy cavitation-resistant thermal spraying powder and method for preparing thermal spraying coating by using same |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN111270187A CN111270187A (en) | 2020-06-12 |
| CN111270187B true CN111270187B (en) | 2023-09-12 |
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