CN117328060A - High-entropy alloy coating for middle groove of coal mine scraper conveyor and preparation method - Google Patents
High-entropy alloy coating for middle groove of coal mine scraper conveyor and preparation method Download PDFInfo
- Publication number
- CN117328060A CN117328060A CN202311575058.4A CN202311575058A CN117328060A CN 117328060 A CN117328060 A CN 117328060A CN 202311575058 A CN202311575058 A CN 202311575058A CN 117328060 A CN117328060 A CN 117328060A
- Authority
- CN
- China
- Prior art keywords
- entropy alloy
- scraper conveyor
- alloy coating
- coal mine
- middle groove
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 229910045601 alloy Inorganic materials 0.000 title claims abstract description 109
- 239000000956 alloy Substances 0.000 title claims abstract description 109
- 238000000576 coating method Methods 0.000 title claims abstract description 81
- 239000011248 coating agent Substances 0.000 title claims abstract description 79
- 239000003245 coal Substances 0.000 title claims abstract description 52
- 238000002360 preparation method Methods 0.000 title claims abstract description 16
- 229910000617 Mangalloy Inorganic materials 0.000 claims abstract description 31
- 239000000758 substrate Substances 0.000 claims abstract description 31
- 230000032683 aging Effects 0.000 claims abstract description 20
- 239000002994 raw material Substances 0.000 claims abstract description 20
- 238000000034 method Methods 0.000 claims abstract description 19
- 238000004372 laser cladding Methods 0.000 claims abstract description 16
- 239000004372 Polyvinyl alcohol Substances 0.000 claims abstract description 12
- 229920002451 polyvinyl alcohol Polymers 0.000 claims abstract description 12
- 239000000843 powder Substances 0.000 claims description 46
- 238000005253 cladding Methods 0.000 claims description 34
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 26
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims description 20
- 238000000498 ball milling Methods 0.000 claims description 12
- 230000008878 coupling Effects 0.000 claims description 11
- 238000010168 coupling process Methods 0.000 claims description 11
- 238000005859 coupling reaction Methods 0.000 claims description 11
- 239000011159 matrix material Substances 0.000 claims description 11
- 239000013307 optical fiber Substances 0.000 claims description 11
- 239000004065 semiconductor Substances 0.000 claims description 11
- 229910052786 argon Inorganic materials 0.000 claims description 10
- 239000007789 gas Substances 0.000 claims description 10
- 238000010438 heat treatment Methods 0.000 claims description 10
- 238000001035 drying Methods 0.000 claims description 7
- 235000019441 ethanol Nutrition 0.000 claims description 7
- 239000012535 impurity Substances 0.000 claims description 7
- 238000004381 surface treatment Methods 0.000 claims description 7
- 244000137852 Petrea volubilis Species 0.000 claims description 5
- 238000004140 cleaning Methods 0.000 claims description 5
- 238000001816 cooling Methods 0.000 claims description 5
- 238000005498 polishing Methods 0.000 claims description 5
- 238000003756 stirring Methods 0.000 claims description 5
- 238000004506 ultrasonic cleaning Methods 0.000 claims description 5
- 238000001291 vacuum drying Methods 0.000 claims description 5
- 238000009489 vacuum treatment Methods 0.000 claims description 5
- 238000005406 washing Methods 0.000 claims description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 5
- 238000002156 mixing Methods 0.000 claims description 2
- 238000005516 engineering process Methods 0.000 abstract description 8
- 238000012986 modification Methods 0.000 abstract description 6
- 230000004048 modification Effects 0.000 abstract description 6
- 239000011230 binding agent Substances 0.000 abstract description 2
- 239000000853 adhesive Substances 0.000 description 10
- 230000001070 adhesive effect Effects 0.000 description 10
- 238000005299 abrasion Methods 0.000 description 9
- 239000000243 solution Substances 0.000 description 9
- 239000002245 particle Substances 0.000 description 8
- 230000001681 protective effect Effects 0.000 description 8
- 230000000052 comparative effect Effects 0.000 description 7
- 238000012360 testing method Methods 0.000 description 7
- 239000000463 material Substances 0.000 description 4
- 229910000831 Steel Inorganic materials 0.000 description 3
- 239000013078 crystal Substances 0.000 description 3
- 230000002431 foraging effect Effects 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- 229910052758 niobium Inorganic materials 0.000 description 3
- 239000010959 steel Substances 0.000 description 3
- 229910052804 chromium Inorganic materials 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 210000001787 dendrite Anatomy 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 229910052742 iron Inorganic materials 0.000 description 2
- 238000011068 loading method Methods 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 238000005065 mining Methods 0.000 description 2
- 229910052750 molybdenum Inorganic materials 0.000 description 2
- 229910052759 nickel Inorganic materials 0.000 description 2
- 230000006911 nucleation Effects 0.000 description 2
- 238000010899 nucleation Methods 0.000 description 2
- 238000011056 performance test Methods 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 238000005728 strengthening Methods 0.000 description 2
- 238000004458 analytical method Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 229910003460 diamond Inorganic materials 0.000 description 1
- 239000010432 diamond Substances 0.000 description 1
- 238000010790 dilution Methods 0.000 description 1
- 239000012895 dilution Substances 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 238000009837 dry grinding Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000007542 hardness measurement Methods 0.000 description 1
- 238000005542 laser surface treatment Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 238000004626 scanning electron microscopy Methods 0.000 description 1
- 238000005482 strain hardening Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000007751 thermal spraying Methods 0.000 description 1
Classifications
-
- 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
-
- 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
- B22F1/10—Metallic powder containing lubricating or binding agents; Metallic powder containing organic material
-
- 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
- B22F9/00—Making metallic powder or suspensions thereof
- B22F9/02—Making metallic powder or suspensions thereof using physical processes
- B22F9/04—Making metallic powder or suspensions thereof using physical processes starting from solid material, e.g. by crushing, grinding or milling
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C30/00—Alloys containing less than 50% by weight of each constituent
-
- 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
-
- 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
- B22F9/00—Making metallic powder or suspensions thereof
- B22F9/02—Making metallic powder or suspensions thereof using physical processes
- B22F9/04—Making metallic powder or suspensions thereof using physical processes starting from solid material, e.g. by crushing, grinding or milling
- B22F2009/043—Making metallic powder or suspensions thereof using physical processes starting from solid material, e.g. by crushing, grinding or milling by ball milling
-
- 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
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Other Surface Treatments For Metallic Materials (AREA)
Abstract
The application relates to the technical field of surface coating modification, and particularly discloses a high-entropy alloy coating for a middle groove of a coal mine scraper conveyor and a preparation method thereof. The high-entropy alloy coating for the middle groove of the coal mine scraper conveyor is prepared by taking CoCrFeNiMoNbTi high-entropy alloy as a raw material, taking polyvinyl alcohol solution as a binder, carrying out coating modification on the surface of a 16 manganese steel substrate by a laser cladding technology, and adopting a gradient aging treatment process. The high-entropy alloy coating for the middle groove of the coal mine scraper conveyor has the characteristics of high hardness, high wear resistance and high impact toughness, is used for the middle groove of the coal mine scraper conveyor, and prolongs the service life of a base body of the middle groove of the coal mine scraper conveyor.
Description
Technical Field
The application relates to the technical field of surface coating modification, in particular to a high-entropy alloy coating for a middle groove of a coal mine scraper conveyor and a preparation method thereof.
Background
The scraper conveyor is core equipment for mechanized coal mining and bears important tasks of coal transportation, coal mining machine operation guiding and hydraulic support pushing and supporting. The central trough is a critical component of the scraper conveyor, which is subject to intense frictional wear by the scraper, scraper chain, coal, etc. during operation, which results in the central trough being the most worn component of the scraper conveyor. And the abrasion failure of the middle groove often causes the defects of multiple faults, shortened service life and incapability of normal operation of other matched equipment of the scraper conveyor, thereby reducing the production efficiency and the safety condition of a coal mine.
At present, most of the materials of the middle groove of the scraper conveyor in China are 16 manganese steel, and under the abrasive particle abrasion working condition, the abrasive particle abrasion working condition is more obvious because the abrasive particle abrasion working condition is caused by the fact that the abrasive particle abrasion working condition is not enough high in surface impact energy and cannot achieve sufficient work hardening, so that the high manganese steel cannot show higher abrasion resistance, the service life of the high manganese steel is influenced.
Therefore, the surface strengthening treatment of the middle groove of the scraper conveyor is a good choice for improving the surface performance of the middle groove of the 16 manganese steel.
The surface strengthening technology is a method for enabling the product to meet the requirements of various working condition environments and prolonging the service life of the product through physical, chemical, mechanical and other means. In recent years, with the development and application of lasers, the laser cladding technology is a novel technology developed after traditional technologies such as thermal spraying, overlaying, plasma cladding and the like, and has the advantages of high efficiency, small heat input, high processing precision, high performance of machined mechanical parts and the like. The laser surface treatment can improve the surface property of the material on the premise of not affecting the overall property of the steel, and has great potential in improving the mechanical property of the steel. In addition, the short processing time, flexible operation and accuracy are also important advantages of the laser surface modification technology relative to the traditional technology.
Disclosure of Invention
In order to further improve the surface property of a middle groove of the scraper conveyor and prolong the service life, the application provides a high-entropy alloy coating for the middle groove of the scraper conveyor for a coal mine and a preparation method thereof, and the surface property of the middle groove is improved by adopting a laser cladding method to clad a layer of high-entropy alloy on the surface of the middle groove through the design of a cladding material system for the middle groove of 16 manganese steel.
In a first aspect, the application provides a preparation method of a high-entropy alloy coating for a middle groove of a coal mine scraper conveyor, which comprises the following steps:
the preparation method of the high-entropy alloy coating for the middle groove of the coal mine scraper conveyor comprises the following steps:
s1, preparing high-entropy alloy powder: measuring the raw material powder according to the atomic ratio, mixing the measured powder, ball milling to 200-300 meshes by using a ball mill, and then vacuum drying for 2 hours at 80 ℃ to obtain high-entropy alloy powder;
s2, surface treatment of a substrate: removing an oxide layer and impurities on the surface of the 16 manganese steel matrix, and drying for later use;
s3, laser cladding: adding 8-10% by mass of polyvinyl alcohol solution into the high-entropy alloy powder obtained in the step S1, stirring to be sticky, uniformly adhering the sticky to the surface of the 16 manganese steel substrate treated in the step S2, and cladding the high-entropy alloy powder on the surface of the substrate by using a high-energy light beam of an optical fiber coupling semiconductor laser to form a high-entropy alloy coating to obtain the high-entropy alloy coating;
s4, heat treatment after cladding: placing the high-entropy alloy coating obtained by laser cladding into a vacuum treatment furnace for ageing treatment, placing into ethanol at the temperature of minus 50 ℃ for cooling for 30min after ageing, and naturally heating to room temperature to obtain the high-entropy alloy coating for the middle groove of the coal mine scraper conveyor; and (4) aging treatment in the step (S4) is as follows: firstly, the temperature is kept at 700 ℃ for 2 hours, then the temperature is kept at 500 ℃ for 1 hour, and then the temperature is kept at 300 ℃ for 0.5 hour.
By adopting the technical scheme, the high-entropy alloy coating for the middle groove of the coal mine scraper conveyor, which has high surface hardness, high wear resistance and good toughness, can be accurately prepared by taking the polyvinyl alcohol solution as an adhesive, adopting laser cladding and performing gradient aging treatment.
Preferably, the ball milling time in the step S1 is 1-2h, the rotating speed of the ball mill is 300-600r/min, and the ball milling tank is filled with argon for protection.
By adopting the technical scheme, the high-entropy alloy powder is kept from being oxidized in the preparation process, and the particle size is moderate, which is a key for ensuring the performance of the high-entropy alloy coating.
Preferably, the surface treatment process of the substrate in S2 is as follows: polishing the surface of the 16 manganese steel substrate by using 200-1000 mesh sand paper to remove an oxide film, washing the surface by running water, then carrying out ultrasonic cleaning in absolute ethyl alcohol to remove surface impurities, and drying for later use after the cleaning is finished.
By adopting the technical scheme, the surface of the 16 manganese steel substrate can be fully combined with the high-entropy alloy coating.
Preferably, the laser focal length of the optical fiber coupling semiconductor laser in the step S3 is 13-16mm, the laser power is 1600-2000W, the scanning speed is 5-7mm/S, the spot diameter is 3-4 mm, the overlapping cladding is performed in a plurality of ways, the overlapping rate is 32-35%, argon is used as a protective gas in the cladding process, and the protective gas flow is 12-18L/min.
By adopting the technical scheme, the laser focal length, the power, the scanning speed, the light spot diameter and the lap joint mode are selected and limited, and the obtained high-entropy alloy coating has uniform and compact cladding layer structure and no air holes, cracks, inclusions and the like.
Preferably, the addition amount of the polyvinyl alcohol solution in the step S3 is 1.2-1.5 times of the mass of the high-entropy alloy powder.
By adopting the technical scheme, the high-entropy alloy powder is uniformly dispersed, and has good adhesion effect with the surface of the 16 manganese steel matrix.
Preferably, the adhesion thickness of the high-entropy alloy powder in the step S3 is 0.8mm-1.5mm.
By adopting the technical scheme, the dilution rate is moderate under the adhesion thickness, and the laser can thoroughly melt the high-entropy alloy coating without excessively damaging the 16 manganese steel matrix.
In a second aspect, the present application provides a high entropy alloy coating for a middle trough of a coal mine scraper conveyor prepared by the method described above:
the high-entropy alloy coating for the middle groove of the coal mine scraper conveyor is prepared from the following raw materials: the raw materials and the atomic fraction thereof are as follows: 17-20% of Co, 17-20% of Cr, 17-20% of Fe, 17-20% of Ni, 8.5-10% of Mo, 5-10.5% of Nb and 5-13% of Ti, wherein the total atomic fraction of all components is 100%, and the purity of each raw material is greater than or equal to 99.9%.
By adopting the technical scheme, the surface hardness, the wear resistance and the toughness of the middle groove matrix of the coal mine scraper conveyor are improved.
Preferably, the raw materials and the atomic fractions thereof are as follows: 18% of Co, 18% of Cr, 18% of Fe, 18% of Ni, 9% of Mo, 8% of Nb and 11% of Ti.
By adopting the technical scheme, the surface performance of the middle groove matrix of the coal mine scraper conveyor is integrally optimal.
In summary, the present application has the following beneficial effects:
1. the invention adopts a laser cladding technology, takes CoCrFeNiMoNbTi high-entropy alloy as cladding coating material, takes polyvinyl alcohol solution as binder, carries out coating modification on the surface of a 16 manganese steel matrix, adopts a gradient aging treatment process, prepares the high-entropy alloy coating with high hardness, high wear resistance and high impact toughness, and improves the surface hardness and wear resistance of the middle groove matrix of the coal mine scraper conveyor.
2. The high-entropy alloy coating obtained by the preparation method has good combination with the 16 manganese steel matrix, and the cladding layer has uniform and compact structure and no pores, cracks, inclusions and the like.
3. The high-entropy alloy coating obtained by the preparation method has obvious microstructure, is of a body-centered cubic (BCC) structure, and has the crystal of a cladding region of equiaxed crystal.
4. The high-entropy alloy coating obtained by the preparation method is 2.26 times of the hardness of the 16 manganese steel substrate, the abrasion loss is reduced by 84%, the elongation at break is improved by 77%, the overall performance is obviously improved compared with that of the 16 manganese steel substrate, and the 16 manganese steel substrate is fully protected, so that the service life of a middle groove of the 16 manganese steel is prolonged, and the high-entropy alloy coating can be better used for a coal mine scraper conveyor.
5. In CoCrFeNiMo 0.5 Nb and Ti elements are added on the basis of the high-entropy alloy coating, and a proper amount of Nb is used as a heterogeneous nucleation core in the high-entropy alloy, so that nucleation is promoted, grains are refined, and the wear resistance is improved; proper amount of Ti can increase lattice distortion in the high-entropy alloy, promote the high-entropy alloy to generate a body-centered cubic (BCC) structure, and improve the hardness of the high-entropy alloy; the gradient aging treatment shows that the high-entropy alloy components after cladding are more uniformly dispersed, and the toughness is further enhanced.
Drawings
Fig. 1: phase analysis diagram of high-entropy alloy coating obtained in example 2 of the application.
Fig. 2: 100 μm microstructure of the cross section of the high entropy alloy coating obtained in example 2 of the present application.
Fig. 3: 10 μm microstructure of cross section of the high entropy alloy coating obtained in example 2 of the present application.
Fig. 4: the high-entropy alloy coating obtained in example 2 of the application has a cross-sectional microhardness distribution curve.
Detailed Description
The present application is described in further detail below with reference to examples.
The raw materials of the examples and comparative examples are all commercially available in general except for the specific descriptions, and the purity of each raw material is 99.9% or more. The laser device adopted in the laser experiment is an LDF4000-100 type optical fiber coupling semiconductor laser.
Examples
Example 1
High-entropy alloy coating for middle groove of coal mine scraper conveyor:
the raw materials and the atomic fraction thereof are as follows: 17% of Co, 17% of Cr, 17% of Fe, 17% of Ni, 8.5% of Mo, 10.5% of Nb and 13% of Ti, and the total atomic fraction of all the components is 100%.
The preparation process comprises the following steps:
s1, preparing high-entropy alloy powder: respectively measuring the raw material powder according to the atomic ratio, putting the measured powder mixture into a ball milling tank filled with argon in a ball mill, ball milling for 2 hours at the rotating speed of 300r/min, changing the particle size of the powder into 300 meshes, and then vacuum drying for 2 hours at 80 ℃ to obtain high-entropy alloy powder;
s2, surface treatment of a substrate: sequentially polishing the surface of the 16 manganese steel substrate by using 220, 400, 600, 800 and 1000-mesh sand paper to remove an oxide film, washing the surface by running water, then carrying out ultrasonic cleaning in absolute ethyl alcohol to remove surface impurities, and drying for later use after the cleaning is finished;
s3, laser cladding: adding an adhesive into the high-entropy alloy powder obtained in the step S1, stirring to be sticky, uniformly adhering the high-entropy alloy powder to the surface of the 16 manganese steel substrate treated in the step S2, wherein the adhering thickness is 0.8mm, and cladding the high-entropy alloy powder on the surface of the substrate by using a high-energy light beam of an optical fiber coupling semiconductor laser to form a high-entropy alloy coating, so as to obtain the high-entropy alloy coating; the adhesive is a polyvinyl alcohol solution with the mass fraction of 8%, and the addition amount is 1.2 times of the mass of the high-entropy alloy powder; the laser focal length of the optical fiber coupling semiconductor laser is 16mm, the laser power is 1600W, the scanning speed is 7mm/s, the spot diameter is 3mm, the multi-channel lap joint cladding is carried out, the lap joint rate is 32%, argon is used as a protective gas in the cladding process, and the protective gas flow is 12L/min;
s4, heat treatment after cladding: placing the sample obtained by laser cladding into a vacuum treatment furnace for aging treatment, placing into ethanol at the temperature of minus 50 ℃ for cooling for 30min after aging, and naturally heating to room temperature to obtain the high-entropy alloy coating for the middle groove of the coal mine scraper conveyor; the aging treatment is as follows: firstly, the temperature is kept at 700 ℃ for 2 hours, then the temperature is kept at 500 ℃ for 1 hour, and then the temperature is kept at 300 ℃ for 0.5 hour.
Example 2
High-entropy alloy coating for middle groove of coal mine scraper conveyor:
the raw materials and the atomic fraction thereof are as follows: 18% Co, 18% Cr, 18% Fe, 18% Ni, 9% Mo, 8% Nb, 11% Ti, and the total atomic fraction of all components is 100%.
The preparation process comprises the following steps:
s1, preparing high-entropy alloy powder: respectively measuring the raw material powder according to the atomic ratio, putting the measured powder mixture into a ball milling tank filled with argon in a ball mill, ball milling for 1.5 hours at the rotating speed of 450r/min, changing the particle size of the powder into 250 meshes, and then vacuum drying for 2 hours at 80 ℃ to obtain high-entropy alloy powder;
s2, surface treatment of a substrate: sequentially polishing the surface of the 16 manganese steel substrate by using 220, 400, 600, 800 and 1000-mesh sand paper to remove an oxide film, washing the surface by running water, then carrying out ultrasonic cleaning in absolute ethyl alcohol to remove surface impurities, and drying for later use after the cleaning is finished;
s3, laser cladding: adding an adhesive into the high-entropy alloy powder obtained in the step S1, stirring to be sticky, uniformly adhering the high-entropy alloy powder to the surface of the 16 manganese steel substrate treated in the step S2, wherein the adhering thickness is 1.2mm, and cladding the high-entropy alloy powder on the surface of the substrate by using a high-energy light beam of an optical fiber coupling semiconductor laser to form a high-entropy alloy coating, so as to obtain the high-entropy alloy coating; the adhesive is polyvinyl alcohol solution with the mass fraction of 9%, and the addition amount is 1.3 times of the mass of the high-entropy alloy powder; the laser focal length of the optical fiber coupling semiconductor laser is 15mm, the laser power is 1800W, the scanning speed is 6mm/s, the spot diameter is 4mm, the multi-channel lap joint cladding is performed, the lap joint rate is 33%, argon is used as a protective gas in the cladding process, and the protective gas flow is 15L/min;
s4, heat treatment after cladding: placing the sample obtained by laser cladding into a vacuum treatment furnace for aging treatment, placing into ethanol at the temperature of minus 50 ℃ for cooling for 30min after aging, and naturally heating to room temperature to obtain the high-entropy alloy coating for the middle groove of the coal mine scraper conveyor; the aging treatment is as follows: firstly, the temperature is kept at 700 ℃ for 2 hours, then the temperature is kept at 500 ℃ for 1 hour, and then the temperature is kept at 300 ℃ for 0.5 hour.
The phase structure of the high entropy alloy coating was examined using an X-ray diffractometer, as shown in fig. 1, and it can be seen that the coating consisted mainly of a Body Centered Cubic (BCC) phase.
The cross-sectional morphology and tissue of the coating were observed and analyzed by scanning electron microscopy at different microscopic magnification, as shown in figures 2 and 3 for the morphology and tissue of 100 μm and 10 μm respectively. As can be seen from FIG. 2, the coating after cladding has good bonding with the 16Mn substrate, the cross section of the coating is compact, and defects such as holes, cracks and the like are not generated; as can be seen from fig. 3, the bonding region is coarse columnar dendrites which appear to grow perpendicular to the interface, the cladding region is equiaxed grains which are coarse from the bottom to fine on the surface.
Microhardness on the coating section was measured using a vickers microhardness tester, with a standard vickers diamond rectangular pyramid indenter, load of 300g, and loading time set at 12s. Hardness measurements were made along the cross section of the sample to the substrate with 50 μm spacing between hardness points, the results are shown in FIG. 4. As can be seen from fig. 4, the hardness value of the coating cladding area is the greatest, and the hardness drop is remarkable in the bonding area, probably because fine equiaxed crystals are gradually coarse from top to bottom in the cladding area, so that the hardness curve of the cladding area is in a slow drop trend, and coarse columnar dendrites are in the bonding area, and the hardness drop is remarkable.
Example 3
High-entropy alloy coating for middle groove of coal mine scraper conveyor:
the raw materials and the atomic fraction thereof are as follows: 20% Co, 20% Cr, 20% Fe, 20% Ni, 10% Mo, 5% Nb, 5% Ti, and the total of the atomic fractions of all components is 100%.
The preparation process comprises the following steps:
s1, preparing high-entropy alloy powder: respectively measuring the raw material powder according to the atomic ratio, putting the measured powder mixture into a ball milling tank filled with argon in a ball mill, ball milling for 1h at the rotating speed of 600r/min, changing the particle size of the powder into 200 meshes, and then vacuum drying for 2h at 80 ℃ to obtain high-entropy alloy powder;
s2, surface treatment of a substrate: sequentially polishing the surface of the 16 manganese steel substrate by using 220, 400, 600, 800 and 1000-mesh sand paper to remove an oxide film, washing the surface by running water, then carrying out ultrasonic cleaning in absolute ethyl alcohol to remove surface impurities, and drying for later use after the cleaning is finished;
s3, laser cladding: adding an adhesive into the high-entropy alloy powder obtained in the step S1, stirring to be sticky, uniformly adhering the high-entropy alloy powder to the surface of the 16 manganese steel substrate treated in the step S2, wherein the adhering thickness is 1.5mm, and cladding the high-entropy alloy powder on the surface of the substrate by using a high-energy light beam of an optical fiber coupling semiconductor laser to form a high-entropy alloy coating, so as to obtain the high-entropy alloy coating; the adhesive is a 10% polyvinyl alcohol solution, and the addition amount of the adhesive is 1.2-1.5 times of the mass of the high-entropy alloy powder; the laser focal length of the optical fiber coupling semiconductor laser is 13mm, the laser power is 2000W, the scanning speed is 5mm/s, the spot diameter is 4mm, the multi-channel lap joint cladding is carried out, the lap joint rate is 35%, argon is used as a protective gas in the cladding process, and the protective gas flow is 18L/min;
s4, heat treatment after cladding: placing the sample obtained by laser cladding into a vacuum treatment furnace for aging treatment, placing into ethanol at the temperature of minus 50 ℃ for cooling for 30min after aging, and naturally heating to room temperature to obtain the high-entropy alloy coating for the middle groove of the coal mine scraper conveyor; the aging treatment is as follows: firstly, the temperature is kept at 700 ℃ for 2 hours, then the temperature is kept at 500 ℃ for 1 hour, and then the temperature is kept at 300 ℃ for 0.5 hour.
Comparative example
Comparative example 1
The same as in example 2, except that the atomic fraction of Nb was 0, 4% and 11%, respectively, and the total atomic fraction was 100% by scaling of other metal elements, the high-entropy alloy coatings a1 to a3 for the middle tank of the scraper conveyor for coal mine were sequentially produced.
Comparative example 2
The same as in example 2, except that the atomic fraction of Ti was 0%, 4% and 14%, respectively, and the total atomic fraction was 100% by scaling of other metal elements, the high-entropy alloy coatings b1 to b3 for the middle grooves of the scraper conveyor for coal mine were sequentially prepared.
Comparative example 3
The same as in example 2, except that: equipotential aging treatment is adopted, and the aging is respectively as follows: preserving heat for 2h at 700 ℃; preserving heat for 1h at 500 ℃; and (3) preserving heat for 0.5h at 300 ℃ to sequentially prepare the high-entropy alloy coating c1-c3 for the middle groove of the coal mine scraper conveyor.
Comparative example 4
The same as in example 2, except that: and the polyvinyl alcohol solution with the concentration of 9% of the adhesive is replaced by ethanol with the same mass, so that the high-entropy alloy coating d1 for the middle groove of the coal mine scraper conveyor is prepared.
The surface of the high-entropy alloy coating d1 for the middle groove of the coal mine scraper conveyor is provided with pits and protrusions, and the pits and the protrusions are uneven, which means that compared with ethanol, the adhesive polyvinyl alcohol solution is used for dispersing the high-entropy alloy powder more uniformly, the adhesion effect on a 16 manganese steel substrate is better, the deviation is not easy to occur in the laser cladding process, and the thickness of the coating is uneven.
Performance test
The high-entropy alloy coating for the middle tank of the coal mine scraper conveyor obtained in examples 1 to 3 and the high-entropy alloy coating a1 to a3, b1 to b3, c1 to c3 for the middle tank of the coal mine scraper conveyor obtained in comparative examples 1 to 3 were used as samples for testing according to the following methods:
the sample microhardness was measured as described in example 2 and the average hardness of the cladding area was calculated.
The wear resistance of the steel is measured by an MM-200 type wear testing machine, the sample size is 4 multiplied by 25MM, the friction working condition is dry grinding sliding friction, the loading is 10kg, the rotating speed is 300r/min, and the experimental time is 1h.
The toughness of the samples was characterized by testing the elongation at break of the samples. The sample was axially stretched using a MTS-4500 stretching device. The working parameters of the test are as follows: the load threshold was 4500N and the test speed was 0.6mm/min. The calculation formula is as follows: elongation at break= (length after test-length before test)/length after test %.
The results are shown in Table 1.
TABLE 1 Performance test results
As can be seen from Table 1, the high-entropy alloy coating for the middle groove of the coal mine scraper conveyor prepared in examples 1-3 of the application has excellent performance, high average hardness, good wear performance and good toughness, the average hardness of a cladding area is up to 600HV, 2.26 times that of a 16 manganese steel substrate, and the wear amount is as low as 0.0004mm 3 Compared with a 16 manganese steel matrix, the elongation at break is reduced by 84 percent and is up to 15 percent, and compared with the 16 manganese steel matrix, the elongation at break is improved by 77 percent. As can be seen by combining the embodiment 2 and the embodiment a1-a3, the abrasion performance of the high-entropy alloy coating for the middle groove of the coal mine scraper conveyor is influenced the most by the Nb element, and the abrasion loss can be reduced by adding a proper amount of Nb element; as can be seen by combining the embodiment 2 and the embodiment b1-b3, the hardness of the high-entropy alloy coating for the middle groove of the coal mine scraper conveyor is influenced the most by the Ti element, and the hardness can be increased by adding a proper amount of Ti element; as can be seen by combining the embodiment 2 and the embodiment c1-c3, the aging treatment has the greatest influence on the elongation at break of the high-entropy alloy coating for the middle groove of the coal mine scraper conveyor, and the gradient aging treatment can be adopted to increase the elongation at break and improve the toughness.
The present embodiment is merely illustrative of the present application and is not intended to be limiting, and those skilled in the art, after having read the present specification, may make modifications to the present embodiment without creative contribution as required, but is protected by patent laws within the scope of the claims of the present application.
Claims (9)
1. The preparation method of the high-entropy alloy coating for the middle groove of the coal mine scraper conveyor is characterized by comprising the following steps of:
s1, preparing high-entropy alloy powder: measuring the raw material powder according to the atomic ratio, mixing the measured powder, ball milling to 200-300 meshes by using a ball mill, and then vacuum drying for 2 hours at 80 ℃ to obtain high-entropy alloy powder;
s2, surface treatment of a substrate: removing an oxide layer and impurities on the surface of the 16 manganese steel matrix, and drying for later use;
s3, laser cladding: adding 8-10% by mass of polyvinyl alcohol solution into the high-entropy alloy powder obtained in the step S1, stirring to be sticky, uniformly adhering the sticky to the surface of the 16 manganese steel substrate treated in the step S2, and cladding the high-entropy alloy powder on the surface of the substrate by using a high-energy light beam of an optical fiber coupling semiconductor laser to form a high-entropy alloy coating to obtain the high-entropy alloy coating;
s4, heat treatment after cladding: placing the high-entropy alloy coating obtained by laser cladding into a vacuum treatment furnace for ageing treatment, placing into ethanol at the temperature of minus 50 ℃ for cooling for 30min after ageing, and naturally heating to room temperature to obtain the high-entropy alloy coating for the middle groove of the coal mine scraper conveyor; the aging treatment is as follows: firstly, the temperature is kept at 700 ℃ for 2 hours, then the temperature is kept at 500 ℃ for 1 hour, and then the temperature is kept at 300 ℃ for 0.5 hour.
2. The method for preparing the high-entropy alloy coating for the middle groove of the coal mine scraper conveyor according to claim 1, wherein the ball milling time in the step S1 is 1-2h, the rotating speed of the ball mill is 300-600r/min, and the ball milling tank is filled with argon for protection.
3. The method for preparing the high-entropy alloy coating for the middle trough of the scraper conveyor for the coal mine according to claim 2, wherein the surface treatment process of the substrate in the step S2 is as follows: polishing the surface of the 16 manganese steel substrate by using 200-1000 mesh sand paper to remove an oxide film, washing the surface by running water, then carrying out ultrasonic cleaning in absolute ethyl alcohol to remove surface impurities, and drying for later use after the cleaning is finished.
4. The method for preparing the high-entropy alloy coating for the middle groove of the scraper conveyor for the coal mine, as claimed in claim 3, wherein the laser focal length of the optical fiber coupling semiconductor laser in the step S3 is 13-16mm, the laser power is 1600-2000W, the scanning speed is 5-7mm/S, the spot diameter is 3-4 mm, the overlapping cladding is carried out in a plurality of steps, the overlapping rate is 32-35%, argon is used as a shielding gas in the cladding process, and the shielding gas flow is 12-18L/min.
5. The method for preparing the high-entropy alloy coating for the middle trough of the scraper conveyor of the coal mine, according to claim 4, wherein the addition amount of the polyvinyl alcohol solution in the step S3 is 1.2-1.5 times of the mass of the high-entropy alloy powder.
6. The method for preparing the high-entropy alloy coating for the middle trough of the scraper conveyor of the coal mine according to claim 5, wherein the adhesion thickness of the high-entropy alloy powder in the step S3 is 0.8mm-1.5mm.
7. The high-entropy alloy coating for the middle trough of the coal mine scraper conveyor, which is prepared by the preparation method of the high-entropy alloy coating for the middle trough of the coal mine scraper conveyor according to any one of claims 1 to 6, is characterized by being prepared from the following raw materials: the raw materials and the atomic fraction thereof are as follows: 17-20% of Co, 17-20% of Cr, 17-20% of Fe, 17-20% of Ni, 8.5-10% of Mo, 5-10.5% of Nb and 5-13% of Ti, and the total atomic fraction of all components is 100%.
8. The high-entropy alloy coating for the middle trough of the scraper conveyor of the coal mine according to claim 7, wherein the coating is prepared from the following raw materials: the raw materials and the atomic fraction thereof are as follows: 18% of Co, 18% of Cr, 18% of Fe, 18% of Ni, 9% of Mo, 7% of Nb and 12% of Ti.
9. The high-entropy alloy coating for a middle trough of a scraper conveyor for coal mines according to claim 7, wherein the purity of each raw material is 99.9% or more.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311575058.4A CN117328060B (en) | 2023-11-24 | 2023-11-24 | High-entropy alloy coating for middle groove of coal mine scraper conveyor and preparation method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311575058.4A CN117328060B (en) | 2023-11-24 | 2023-11-24 | High-entropy alloy coating for middle groove of coal mine scraper conveyor and preparation method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN117328060A true CN117328060A (en) | 2024-01-02 |
| CN117328060B CN117328060B (en) | 2024-02-13 |
Family
ID=89279533
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202311575058.4A Active CN117328060B (en) | 2023-11-24 | 2023-11-24 | High-entropy alloy coating for middle groove of coal mine scraper conveyor and preparation method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN117328060B (en) |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106086580A (en) * | 2016-07-29 | 2016-11-09 | 昆明理工大学 | Laser melting coating high-entropy alloy powder and cladding layer preparation method |
| CN109252162A (en) * | 2018-11-09 | 2019-01-22 | 中国石油大学(华东) | A kind of high-entropy alloy with properties of antifriction and wear resistance |
| CN109797390A (en) * | 2017-11-17 | 2019-05-24 | 天津大学 | A kind of iron-based high-entropy alloy powder of wind power bearing and its cladding layer preparation method |
| CN109797391A (en) * | 2017-11-17 | 2019-05-24 | 天津大学 | A kind of preparation method of wind power bearing low dilution rate FeCrCoNiMoTi high-entropy alloy powder and its cladding layer |
| US20200158123A1 (en) * | 2017-10-31 | 2020-05-21 | Hitachi Metals, Ltd. | Alloy article, method for manufacturing said alloy article, product formed of said alloy article, and fluid machine having said product |
| US20220016705A1 (en) * | 2019-04-12 | 2022-01-20 | Soochow University | FeCrCuTiV High-entropy Alloy Powder for Laser Melting Deposition Manufacturing and Preparation Method Thereof |
| CN115555569A (en) * | 2022-09-30 | 2023-01-03 | 瓮福（集团）有限责任公司 | Preparation method of high-entropy alloy coating material with high wear resistance and corrosion resistance |
| CN116368250A (en) * | 2020-11-04 | 2023-06-30 | 株式会社博迈立铖 | Method for producing alloy member, and article produced using alloy member |
-
2023
- 2023-11-24 CN CN202311575058.4A patent/CN117328060B/en active Active
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106086580A (en) * | 2016-07-29 | 2016-11-09 | 昆明理工大学 | Laser melting coating high-entropy alloy powder and cladding layer preparation method |
| US20200158123A1 (en) * | 2017-10-31 | 2020-05-21 | Hitachi Metals, Ltd. | Alloy article, method for manufacturing said alloy article, product formed of said alloy article, and fluid machine having said product |
| CN109797390A (en) * | 2017-11-17 | 2019-05-24 | 天津大学 | A kind of iron-based high-entropy alloy powder of wind power bearing and its cladding layer preparation method |
| CN109797391A (en) * | 2017-11-17 | 2019-05-24 | 天津大学 | A kind of preparation method of wind power bearing low dilution rate FeCrCoNiMoTi high-entropy alloy powder and its cladding layer |
| CN109252162A (en) * | 2018-11-09 | 2019-01-22 | 中国石油大学(华东) | A kind of high-entropy alloy with properties of antifriction and wear resistance |
| US20220016705A1 (en) * | 2019-04-12 | 2022-01-20 | Soochow University | FeCrCuTiV High-entropy Alloy Powder for Laser Melting Deposition Manufacturing and Preparation Method Thereof |
| CN116368250A (en) * | 2020-11-04 | 2023-06-30 | 株式会社博迈立铖 | Method for producing alloy member, and article produced using alloy member |
| CN115555569A (en) * | 2022-09-30 | 2023-01-03 | 瓮福（集团）有限责任公司 | Preparation method of high-entropy alloy coating material with high wear resistance and corrosion resistance |
Non-Patent Citations (2)
| Title |
|---|
| JIANG XU、SHUANG PENG等: "Remarkable cavitation erosion–corrosion resistance of CoCrFeNiTiMo high-entropy alloy coatings", CORROSION SCIENCE, vol. 190, pages 1 - 16 * |
| RUI FAN、LIPING WANG: "Synergistic effect of Nb and Mo alloying on the microstructure and mechanical properties of CoCrFeNi high entropy alloy", MATERIALS SCIENCE & ENGINEERING A, vol. 829, pages 1 - 9 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN117328060B (en) | 2024-02-13 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| Inasaki | Grinding of hard and brittle materials | |
| CN1934620A (en) | Glass substrate for magnetic disk | |
| CN111235565B (en) | Mo-like high-entropy alloy and application method thereof as cutter coating material | |
| CN109848821A (en) | A kind of environmentally protective cmp method of nickel alloy | |
| CN111118493A (en) | Titanium-based wear-resistant laser cladding layer containing copper on titanium alloy surface and preparation method thereof | |
| CN109722664B (en) | Novel alloy powder for repairing steel rail and method for repairing surface damage of steel rail | |
| CN107267979A (en) | The intensifying method and high intensity shield machine cutter head of a kind of shield machine cutter head | |
| CN113832461A (en) | Nickel-based alloy powder for laser cladding, ceramic particle reinforced composite powder and application | |
| CN111719147B (en) | Material suitable for reproducing 35CrMnSiA and 42CrMo cutting teeth and laser cladding method | |
| CN104313365B (en) | A kind of preparation method of nickel-aluminum bronze | |
| CN111139467A (en) | Laser repair layer containing rare earth oxide on titanium alloy surface and preparation method thereof | |
| Wang et al. | Comparison of the electrochemical dissolution behavior of extruded and casted Ti-48Al-2Cr-2Nb alloys in NaNO3 solution | |
| CN117328060B (en) | High-entropy alloy coating for middle groove of coal mine scraper conveyor and preparation method | |
| Jiang et al. | Effect of applied angle on the microstructure evolution and mechanical properties of laser clad 3540 Fe/CeO2 coating assisted by in-situ ultrasonic vibration | |
| Ding et al. | Microstructure and properties of Mo-Si-B-Y2O3 composite coating on nickel-based alloy by laser cladding | |
| CN112626515A (en) | Method for improving performance of Inconel625 nickel-based powder laser cladding layer | |
| CN114134426B (en) | Iron-based laser cladding layer powder and preparation method of iron-based laser cladding layer | |
| WO2024077654A1 (en) | Wc-ni wear-resistant coating on 316l stainless steel surface and preparation method therefor | |
| CN115874175B (en) | High-performance laser cladding alloy cutter and preparation method thereof | |
| CN113308629B (en) | Nickel-based alloy powder for petroleum plunger laser cladding and application method | |
| CN107190177B (en) | A kind of zirconium Ti-Ni alloy and preparation method thereof | |
| Ji et al. | Surface integrity of quenched steel 1045 machined by CBN grinding wheel and SiC grinding wheel | |
| Changyong et al. | Effect of cerium on microstructure, wetting and mechanical properties of Ag-Cu-Ti filler alloy | |
| CN111693674A (en) | Texture performance analysis method for high-temperature friction and wear of Co-based coating | |
| Zhou et al. | Study on fatigue crack growth behavior of the TA15 titanium alloy repaired by laser deposition |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| TR01 | Transfer of patent right | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20240218 Address after: 714000 Hanjing Town, Pucheng County, Weinan City, Shaanxi Province Patentee after: XI'AN HEAVY EQUIPMENT PUBAI COAL MINING MACHINERY Ltd. Country or region after: China Patentee after: Shaanxi University of Technology Address before: Small and Micro Park, Xiaotunzhuang Village, Huangzhai Town, Yangqu County, Taiyuan City, Shanxi Province, 030100 Patentee before: Shanxi Haicheng Intelligent Manufacturing Co.,Ltd. Country or region before: China Patentee before: XI'AN HEAVY EQUIPMENT PUBAI COAL MINING MACHINERY Ltd. Patentee before: Shaanxi University of Technology |