In-situ synthesis of TiB reinforced wear-resistant composite coating and preparation method thereof

Abstract

The application discloses an in-situ synthesized TiB reinforced phase wear-resistant composite coating and a preparation method thereof. The in-situ synthesized TiB reinforced phase wear-resistant composite coating comprises the following components in mass fraction: 0.1-5% of LaB6 powder, 85-95% of Ni60 powder and 6% of TC4 powder. The in-situ synthesized TiB reinforced phase wear-resistant composite coating has the advantages that the coating has good compactness, no pores and cracks, high hardness, good and stable wear-resistant effect, good metallurgical combination with the base body, and the coating will not fall off in the working process; the coating does not need special and / or expensive equipment, and the process is simple and easy to operate; the material is cheap and low in cost, and will not pollute the environment, and has good application prospect and economic benefits, and is suitable for the repair and maintenance of mine machinery, petroleum pipes, metallurgical equipment and parts.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of wear-resistant coating, in particular to a kind of in-situ synthesis TiB reinforced phase wear-resistant composite coating and preparation method thereof. BACKGROUND

[0002] Coal machinery equipment often works in strong corrosion, high impact, high wear environment, its main failure modes include intermetallic, intermetallic and ore of mining and transportation mechanism, long-term corrosion failure of hydraulic mechanism in the mine and deformation of hydraulic mechanism under long-term stress.

[0003] Taking wear as an example, the jaw plate of jaw crusher, the lining plate of cone crusher, the crushing roller of roller crusher, the hammer head of hammer crusher, the lining plate and the screen plate are seriously worn in the use process; The middle trough, chain and chain wheel parts of the scraper conveyor are more prominent in wear; The teeth of the heading machine directly contact with ore, sand and rock in the use process, which is the most severely worn part in mining operation.

[0004] In addition, the lining plate and steel ball of the ball mill, the cutting tooth and the drum of the coal mining machine, the steel wire rope and the lining plate of the elevator, the screen plate of the vibrating screen, the rake of the rake loader, the blade of the ventilator, the wheel pair and the car body of the mine car all belong to the easily worn failure components.

[0005] The tonnage of the failure parts of coal machinery is very large, and these failure parts account for a large proportion in the cost of coal production, therefore, it is urgent to develop reliable equipment, green remanufacturing technology and cladding material with good wear resistance.

[0006] Laser cladding is a new surface modification technology, which refers to the method of melting the cladding material added on the surface of the substrate and the thin layer of the substrate surface by using high-energy-density laser beam, so that they are solidified together. Compared with traditional repair methods, laser cladding has the advantages of metallurgical bonding between substrate and cladding layer, small heat-affected zone during cladding process, excellent performance of cladding layer and convenience of subsequent processing of repaired parts, etc., which provides a new processing way for improving the repair quality of parts and remanufacturing. SUMMARY

[0007] The purpose of the present application is to provide a kind of in-situ synthesis TiB reinforced phase wear-resistant composite coating and preparation method thereof, to solve the problem of serious wear of coal machinery, large tonnage of failure parts, failure parts cannot be recycled, high cost of coal production.

[0008] To achieve the above object, the application provides an in-situ synthesized TiB reinforced phase wear-resistant composite coating and a preparation method thereof.

[0009] Preferably, the components include 0.5% of LaB6 powder, 93.5% of Ni60 powder and 6% of TC4 powder.

[0010] Preferably, the components include 1.5% of LaB6 powder, 92.5% of Ni60 powder and 6% of TC4 powder.

[0011] Preferably, the components include 2.5% of LaB6 powder, 91.5% of Ni60 powder and 6% of TC4 powder.

[0012] Preferably, the Ni60 powder is a powder passing through a 200-mesh sieve and includes the following mass fractions of chemical components: 61.2% of Ni, 15% of Fe, 15.5% of Cr, 0.8% of C, 4% of Si and 3.5% of B.

[0013] Preferably, the TC4 powder is a Ti6Al4V powder.

[0014] A preparation method of the in-situ synthesized TiB reinforced phase wear-resistant composite coating as described above, comprising the following steps:

[0015] S1, substrate pretreatment, rust removal on the surface of the machined 35CrMoV steel, and then sanding to obtain a smooth surface;

[0016] S2, wear-resistant composite coating powder preparation, uniformly mixing the wear-resistant composite coating powder according to the proportion;

[0017] S3, laser cladding wear-resistant composite coating preparation, prepositioning the wear-resistant composite coating powder obtained in step S2 on the surface of the 35CrMoV steel substrate in a prepositioned powder feeding mode, and performing laser cladding under argon protection.

[0018] Preferably, the laser cladding process parameters in step S3 are as follows: laser power 3000W, spot diameter 3mm, scanning speed 120mm / min, overlap rate 0.4 and protective gas flow rate 15L / min.

[0019] An application of the in-situ synthesized TiB reinforced phase wear-resistant composite coating as described above in the repair and maintenance of mine machinery, petroleum pipes, metallurgical equipment parts.

[0020] Therefore, the application provides a TiB reinforced phase wear-resistant composite coating and a preparation method thereof.

[0021] 1. The wear-resistant composite coating provided by the application is connected through chemical bonds between components, so that the obtained coating has good compactness, no pores and cracks, high hardness, good and stable wear-resistant effect;

[0022] 2. The TC4 powder and the LaB6 powder in the wear-resistant composite coating can form carbides on the surface of the steel during the laser cladding process, and then dissolve into Ni to form a solid solution, so that the prepared wear-resistant composite coating and the base steel material present good metallurgical bonding performance, forming an integral whole and not falling off during the working process of the steel base material;

[0023] 3. The preparation method of the wear-resistant coating provided by the application does not require special and / or expensive equipment, the process is simple and easy to operate, the material price is cheap, the cost is low, and the environment is not polluted, so it has good application prospect and economic benefit, and is suitable for repair and maintenance of mine machinery, petroleum pipes, metallurgical equipment parts.

[0024] The technical solutions of the application will be further described in detail below with the help of the accompanying drawings and examples. BRIEF DESCRIPTION OF DRAWINGS

[0025] In order to more clearly illustrate the technical solutions of the embodiments of the application, the drawings needed to be used in the description of the embodiments of the application will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the application, and other drawings can be obtained by those skilled in the art without creative labor.

[0026] Figure 1 SEM images of the TiB reinforced phase wear-resistant composite coating prepared in the second and third embodiments of the application;

[0027] Figure 2 Three-dimensional surface topography map after dry sliding friction experiment in the third effect example of the application. DETAILED DESCRIPTION

[0028] The technical solutions of the application will be further described in detail below with the help of the accompanying drawings and examples.

[0029] In order to make the purpose, technical solutions and advantages of the application more clear, thorough and complete, the technical solutions of the application will be clearly and completely described below with the help of the accompanying drawings and examples. The following detailed description is the description of the embodiments, which aims to provide further detailed description of the application. Unless otherwise specified, all technical terms used in the application have the same meaning as generally understood by those skilled in the art to which the application belongs.

[0030] The 35CrMoV steel used in the examples was purchased from Mckee Metals Ltd. Co.;

[0031] The industrial absolute ethanol was produced by Taicang Xintai Alcohol Co. Ltd.;

[0032] The LaB6 powder, the Ni60 powder and the TC4 powder were all produced by Wuhan Institute of Material Protection;

[0033] The electronic balance was produced by Shanghai Huachao Electrical Appliance Co. Ltd. with the model of BSM220.3;

[0034] The powder mixing machine was produced by Dongguan KeDe Machinery Co. Ltd.;

[0035] The laser cladding platform was produced by Tianyuan Intelligent Remanufacturing Co. Ltd. with the model of BS-OF-3000-15-4L;

[0036] The metallographic polishing machine was produced by Shanghai Jinxiang Machinery Equipment Co. Ltd. with the model of MP-2B;

[0037] The micro Vickers hardness tester was produced by Shanghai Lanshi Industry Co. Ltd. with the model of HMAS-D1000SZ;

[0038] The electrochemical corrosion friction and wear tester was produced by Lanzhou Huahui Instrument Technology Co. Ltd. with the model of MFT-R4000;

[0039] The non-contact optical profiler was produced by Unicron Technology Co. Ltd. with the model of Microxam-800;

[0040] The DK7745 wire cutting was produced by Dongma CNC Equipment Co. Ltd.

[0041] Example one

[0042] Preparation of a in-situ synthesized TiB reinforced phase wear-resistant composite coating, comprising the following steps:

[0043] S1, substrate pretreatment

[0044] The 35CrMoV steel was selected as the substrate material, first sandblasting treatment was carried out to realize the surface rust removal of the substrate material, then the surface oxide layer of the substrate material was polished off with fine sandpaper to obtain a smooth surface, and then the surface of the substrate material was wiped twice with degreasing cotton dipped in industrial absolute ethanol (ethanol content > 97.7%).

[0045] S2, preparation of wear-resistant composite coating powder

[0046] Accurately take 93.5 mg of 200 mesh Ni60 powder, 0.5 mg of LaB6 powder, and 6 mg of TC4 powder, mix them in a powder mixer at a speed of 200 rpm, and ball mill for 2 hours. Then dry the mixed powder at a temperature of 120°C for 40 minutes.

[0047] S3, preparation of laser cladding wear-resistant composite coating

[0048] Using the preset powder feeding method, the dry treated wear-resistant composite coating powder is prepositioned on the surface of the preheated 35CrMoV steel substrate with a thickness of 1.5 mm. Laser cladding is carried out under argon protection. The laser cladding parameters are set as follows: laser power 3000 W, spot diameter 3 mm, scanning speed 120 mm / min, overlap rate 0.4, and protective gas flow rate 15 L / min. The TiB reinforced wear-resistant composite coating is obtained after the cladding is completed.

[0049] Example Two

[0050] A TiB reinforced wear-resistant composite coating is prepared by in-situ synthesis. The steps are exactly the same as in Example One, except that in step S2, the wear-resistant composite coating powder is composed of 92.5 mg of 200 mesh Ni60 powder, 1.5 mg of LaB6 powder, and 6 mg of TC4 powder, which are mixed in a powder mixer for 2.5 hours.

[0051] Example Three

[0052] A TiB reinforced wear-resistant composite coating is prepared by in-situ synthesis. The steps are exactly the same as in Example One, except that in step S2, the wear-resistant composite coating powder is composed of 91.5 mg of 200 mesh Ni60 powder, 2.5 mg of LaB6 powder, and 6 mg of TC4 powder, which are mixed in a powder mixer for 3 hours.

[0053] Effect Verification

[0054] Effect Example One

[0055] Electron Microscope Results of TiB Reinforced Wear-Resistant Composite Coating Prepared by In-Situ Synthesis

[0056] The TiB reinforced wear-resistant composite coatings prepared by in-situ synthesis in 35CrMoV steel substrate (a), Example Two (b), and Example Three (c) are observed by scanning electron microscope. The results are shown in Figure 1 .

[0057] Effect Example Two

[0058] Hardness Test of TiB Reinforced Wear-Resistant Composite Coating Prepared by In-Situ Synthesis

[0059] The hardness of the original 35CrMoV steel substrate, the in-situ synthesized TiB reinforced wear-resistant composite coating coated on the surface of the 35CrMoV steel substrate in Examples Two and Three was tested by using a HMAS-D1000SZ micro Vickers hardness tester, the loading force was 9.8N, and the duration was 10s.

[0060] In order to ensure the accuracy of the test, three points were tested on the surface of the original 35CrMoV steel substrate, the in-situ synthesized TiB reinforced wear-resistant composite coating coated on the surface of the 35CrMoV steel substrate in Examples Two and Three, and then the average value of the three test points was taken as the final hardness value. Because the 35CrMoV steel substrate coated with the composite coating prepared in Examples Two and Three needed to be cut (completed by DK7745 wire cutting) into a size of 15mmx10mmx10mm to meet the requirements of the machine before the hardness test, the interval in the effect example was selected as 0.5mm, and the test results are shown in Table 1.

[0061] Table 1

[0062] 35CrMoV Example Two Example Three Hardness value (HV) 315 808 843 Increase over steel substrate (%) 256 267

[0063] Effect Example Three

[0064] Testing the friction and wear properties of the in-situ synthesized TiB reinforced wear-resistant composite coating

[0065] The dry sliding friction test was performed on the original 35CrMoV steel substrate, the in-situ synthesized TiB reinforced wear-resistant composite coating coated on the surface of the 35CrMoV steel substrate in Examples Two and Three by using a MFT-R4000 electrochemical corrosion friction and wear tester to test the friction and wear properties of the in-situ synthesized TiB reinforced wear-resistant composite coating.

[0066] The parameter setting was as follows: the high-speed linear reciprocating trajectory was selected, Si3N4(Φ=6mm) ball was used as the friction pair, the loading load was 5N, the wear time was 20min, the friction stroke was 10mm, and the fixed frequency was 2Hz. The three-dimensional surface morphology was characterized by using a Microxam-800 non-contact optical profiler (see Figure 2 ), so as to quantitatively analyze the wear volume and wear depth of the cladding layer. The friction and wear property test results are shown in Table 2.

[0067] Table 2

[0068] 35CrMoV Example Two Example Three wear amount (pm 3 )]]> 17430 8943 10347 Wear reduction (%) 48.7 40.6

[0069] Result Analysis

[0070] From Figure 1It can be seen that the components of the in-situ synthesized TiB reinforced wear-resistant composite coating prepared in Example 2 and Example 3 are uniformly distributed and closely combined together, the coating surface is smooth, and there is no pore and crack.

[0071] As shown in Table 1, the hardness of the 35CrMoV steel substrate is 315HV, the hardness of the in-situ synthesized TiB reinforced wear-resistant composite coating prepared in Example 2 is 808HV, which is increased by 256% compared with the hardness of the 35CrMoV steel substrate; the hardness of the in-situ synthesized TiB reinforced wear-resistant composite coating prepared in Example 3 is 843HV, which is increased by 267% compared with the hardness of the 35CrMoV steel substrate.

[0072] As shown in Table 1, the hardness of the 35CrMoV steel substrate is 315HV, the hardness of the in-situ synthesized TiB reinforced wear-resistant composite coating prepared in Example 2 is 808HV, which is increased by 256% compared with the hardness of the 35CrMoV steel substrate; the hardness of the in-situ synthesized TiB reinforced wear-resistant composite coating prepared in Example 3 is 843HV, which is increased by 267% compared with the hardness of the 35CrMoV steel substrate. Figure 2 As shown in Table 2, after being treated by the friction and wear tester for 20min, the wear amount of the 35CrMoV steel substrate is 17430μm 3 , the wear amount of the in-situ synthesized TiB reinforced wear-resistant composite coating prepared in Example 2 is 8943μm 3 , which is reduced by 48.7% compared with the wear amount of the steel substrate; the wear amount of the in-situ synthesized TiB reinforced wear-resistant composite coating prepared in Example 3 is 10347μm 3 , which is reduced by 40.6% compared with the wear amount of the steel substrate.

[0073] Therefore, the preparation method of the in-situ synthesized TiB reinforced wear-resistant composite coating provided by the present application can make the cladding layer and the substrate present good metallurgical combination, and the obtained coating has good compactness, no pore and crack, and high hardness, so that the wear resistance of the steel substrate can be significantly improved; the coating and the substrate have good metallurgical combination, and form an integral whole, so that the coating will not fall off during work; no special and / or expensive equipment is needed, the process is simple and easy to operate, the material price is cheap, the cost is low, and the environment will not be polluted, so that the present application has good application prospect and economic benefit, and is suitable for repair and maintenance of mine machinery, petroleum pipe, and metallurgical equipment parts.

[0074] Finally, it should be noted that the above examples are only used to illustrate the technical solutions of the present application but not to limit the same, and although the present application has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that the technical solutions of the present application can be modified or replaced equivalently, and these modifications or equivalent replacements will not make the modified technical solutions deviate from the spirit and scope of the technical solutions of the present application.

Claims

1. A wear resistant composite coating in-situ synthesized with TiB reinforcing phase, characterized in that, comprise the following components in mass fraction: 1.5% of LaB6 powder, 92.5% of Ni60 powder and 6% of TC4 powder; or 2.5% of LaB6 powder, 91.5% of Ni60 powder and 6% of TC4 powder; The application discloses a preparation method of a wear-resistant composite coating in-situ synthesized with a TiB reinforcing phase, and comprises the following steps: S1, pretreatment of the substrate, rust removal is performed on the surface of the processed 35CrMoV steel, and then sandpaper polishing is performed to obtain a smooth surface; S2, preparation of the wear-resistant composite coating powder, the wear-resistant composite coating powder is uniformly mixed according to the proportion; S3, preparation of the laser cladding wear-resistant composite coating, the wear-resistant composite coating powder obtained in the step S2 is prepositioned on the surface of the 35CrMoV steel substrate in a prepositioned powder feeding mode, and laser cladding is performed under the protection of argon gas; The laser cladding process parameters in the step S3 are as follows: the laser power is 3000W, the spot diameter is 3mm, the scanning speed is 120mm / min, the lap rate is 0.4, and the protective gas flow rate is 15L / min.

2. The in-situ synthesized TiB reinforced wear resistant composite coating according to claim 1, characterized in that, The Ni60 powder is a powder passing through a 200-mesh screen, and comprises the following chemical components in mass fraction: 61.2% of Ni, 15% of Fe, 15.5% of Cr, 0.8% of C, 4% of Si and 3.5% of B.

3. The in-situ synthesized TiB reinforced wear resistant composite coating according to claim 1, characterized in that: The TC4 powder is a Ti6A14V powder.

4. Application of the wear-resistant composite coating in-situ synthesized with a TiB reinforcing phase according to any one of claims 1-3 to the repair and maintenance of mine machinery, petroleum pipes, metallurgical equipment parts.

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