A current-carrying friction and wear protective coating with good electrical conductivity, a preparation method and applications thereof

Abstract

This invention relates to the field of coating preparation technology, specifically to a current-carrying friction and wear protective coating with good electrical conductivity, its preparation method, and its application. The coating is prepared by granulation, sintering, and sieving of Ti2AlC powder. The coating raw materials are Ti2AlC powder and metallic Cu powder, with the Ti2AlC phase ratio being 10%~40%. A composite coating is prepared on the surface of boiler steel using supersonic flame spraying technology. The spraying process parameters are: kerosene flow rate 23~29 L / h, oxygen flow rate 53 m³ / h. 3 With a powder feed rate of 30 g / min, a step size of 3 mm, a spraying distance of 320 mm, and a spray gun moving speed of 800 mm / min, the application of Ti2AlC phase-reinforced Cu-based composite coating under current-carrying friction and wear conditions is realized. This provides a method to improve the current-carrying friction protection performance of Cu alloy surfaces without affecting the coating conductivity, which helps to improve the reliability, efficiency, lifespan, and safety of related equipment.

Description

Technical Field

[0001] This invention relates to the field of coating preparation technology, specifically to a current-carrying tribological wear protective coating with good electrical conductivity, its preparation method, and its application. Background Technology

[0002] Electromagnetic rails possess revolutionary potential to overcome the limits of chemical energy propulsion by utilizing electromagnetic force, bringing disruptive advantages to future weapon systems (especially naval long-range precision strikes and air defense / missile defense). However, their technological realization faces extremely harsh multi-physics coupling environments (electric-magnetic-thermal-mechanical-plasma), among which the reliability and lifespan of the rails and armatures under ultra-high current density, strong magnetic fields, and high-speed sliding / arc conditions are currently the most significant engineering bottlenecks. Although the technical difficulty is extremely high, its strategic value drives continuous research investment from many countries, particularly breakthroughs in high-performance ablation-resistant materials (composite materials, gradient materials, advanced coatings) and novel armature designs. Future practical deployment depends on effectively overcoming these core bottlenecks.

[0003] Copper alloys, with their unparalleled electrical and thermal conductivity, are the cornerstone of electromagnetic rail materials (especially rails). High-strength precipitation-strengthened copper alloys and copper-based composites are currently the focus of engineering applications and research. The core challenge: Under extreme coupling conditions of megaampere-level currents, sliding speeds of several kilometers per second, and arc temperatures in the tens of thousands of degrees Celsius range, the ablation resistance, high-temperature strength, and wear resistance of copper alloys remain insufficient, resulting in extremely short rail lifespans (possibly only a few launches), which is one of the biggest bottlenecks restricting the practical application of electromagnetic rails.

[0004] Surface coating construction technology based on thermal spraying is advantageous due to its high controllability of process parameters, fast deposition rate, and excellent interfacial bonding strength. For electromagnetic rails facing wear-arc ablation coupled damage during operation, an ideal protective coating must simultaneously meet the following requirements: high conductivity; resistance to arc ablation; and strong adhesion. While traditional Cu coatings possess good conductivity, their low hardness makes them unsuitable for long-term operation under current-carrying frictional wear environments.

[0005] In view of the above-mentioned defects, the inventors of this invention have finally obtained this invention after a long period of research and practice. Summary of the Invention

[0006] The purpose of this invention is to solve the problem that although traditional Cu coatings have good electrical conductivity, their low hardness makes them difficult to operate for a long time in a current-carrying friction and wear environment. The invention provides a current-carrying friction and wear protective coating with good electrical conductivity, its preparation method, and its application.

[0007] To achieve the above objectives, this invention discloses a method for preparing a current-carrying tribological wear protective coating with good electrical conductivity, comprising the following steps:

[0008] S1, mix Ti2AlC with 4% polyvinyl alcohol by weight of Ti2AlC, 0.4% 1-octanol by weight of Ti2AlC and deionized water, and add the mixture to an alumina ball mill jar;

[0009] S2, spray granulation is performed on the slurry obtained in step S1 to obtain agglomerated powder. Then, the agglomerated powder is sintered. After vacuum sintering, the agglomerated powder is sieved and classified to finally obtain Ti2AlC powder.

[0010] S3, mix the Ti2AlC powder sieved in step S2 with Cu powder to obtain a mixed powder;

[0011] S4, roughen the substrate by sandblasting;

[0012] S5, a composite coating is prepared by spraying mixed powder onto the substrate after roughening in step S4 using supersonic flame spraying technology.

[0013] In step S1, the weight ratio of Ti2AlC to deionized water is 2:3.

[0014] In step S1, Ti2AlC is in the form of flake powder with a purity greater than 99.5%.

[0015] In step S1, the ball milling time is 4 hours and the rotation speed is 360 r / min.

[0016] In step S2, the sintering temperature of vacuum sintering is 1300 ℃.

[0017] In step S2, the Ti2AlC powder obtained by sieving and grading has a particle size of 25~71 μm.

[0018] In step S3, the mass ratio of Ti2AlC powder is 10%~40%.

[0019] In step S5, the process parameters for supersonic flame spraying technology are: kerosene volume 23~29 L / h, oxygen flow rate 53 m³ / h. 3 / h, powder feed rate 30 g / min, step distance 3 mm, spraying distance 320 mm, spray gun moving speed 800 mm / min.

[0020] This invention also discloses a highly conductive current-carrying tribological wear protective coating prepared by the above-described method, and its application in current-carrying tribological wear environments. Current-carrying tribological wear is essentially a synergistic destructive process involving multiple coupled fields of heat, electricity, and mechanics. The introduction of additional energy input by the current, converted into heat energy through Joule heating and the arc effect, becomes the fundamental cause of accelerated material failure. In this process, arc erosion and melt transfer typically replace adhesive wear and abrasive wear in purely mechanical wear, becoming the dominant wear mechanism. Simultaneously, contact resistance, surface morphology, and material composition are constantly undergoing drastic dynamic changes, making them highly susceptible to instability and further exacerbating material degradation and failure.

[0021] The purpose of this invention is to use inexpensive flake-shaped Ti2AlC powder as a raw material, granulate and sinter it into spherical particles, and control the ratio of Ti2AlC to Cu powder. Using supersonic flame spraying technology, a cermet coating with excellent adhesion, electrical conductivity, and resistance to current-carrying tribological wear is obtained. This method effectively suppresses the decomposition of Ti2AlC during the spraying process, and by controlling the composition of the Cu metal phase, a strongly bonded coating is prepared by supersonic flame spraying. Ultimately, the coating performance leverages the advantages of both Ti2AlC and Cu phases.

[0022] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0023] 1. This invention introduces Ti2AlC, a MAX phase ceramic material, as a reinforcing phase. This material exhibits metal-ceramic composite characteristics, possessing advantages such as low density (4.11 g / cm³), excellent high-temperature oxidation resistance (>1200℃), good thermal conductivity (>25 W / (m·K)), and outstanding microcrack self-healing function. By preparing a Ti2AlC-reinforced Cu composite coating, while maintaining high-temperature oxidation resistance and good electrical conductivity, the coating hardness can be increased, significantly improving its current-carrying tribological wear performance. This provides a cost-effective and performance-advantageous surface engineering solution for the design of novel current-carrying friction materials.

[0024] 2. The Ti2AlC phase in this invention, as a ceramic coating, is generally prepared using plasma spraying technology. However, the Ti2AlC phase is prone to decomposition during preparation. By combining Cu with the Ti2AlC phase and selecting low-cost flake-shaped Ti2AlC particles, and through processes such as granulation and mixing, a low-cost Cu-Ti2AlC coating was successfully prepared using a supersonic spraying process. The resulting Cu-Ti2AlC composite coating is dense, tightly bonded to the substrate, and free of defects such as pores. During the coating preparation process, the Ti2AlC phase is well preserved, and no obvious decomposition was observed. The small amount of TiC reinforcing phase formed also has good wear resistance. The addition of these reinforcing phases provides a guarantee for the application of Cu-based composite coatings in current-carrying friction and wear environments without affecting the conductivity of the coating, thus enabling the coating to be used in current-carrying friction and wear environments. Attached Figure Description

[0025] Figure 1 The XRD patterns of the composite coatings obtained in Examples 1 and 2 (Comparative Example 0) are shown.

[0026] Figure 2 The XRD patterns of the composite coatings obtained in Examples and Comparative Examples 1, 2 and 3 are shown.

[0027] Figure 3 Examples and comparative examples 1, 2 and 3 show the cross-sectional morphology of the coatings;

[0028] Figure 4 The following are bar charts showing the microhardness of the coatings in Examples 1, 2, and 3, and Comparative Examples 2 and 3.

[0029] Figure 5 The above are bar graphs showing the coating adhesion of the embodiments and comparative examples 1, 2 and 3.

[0030] Figure 6 The current-carrying friction coefficient (COF) curves of the coatings in the examples and comparative examples 1, 2 and 3 are shown.

[0031] Figure 7 Bar charts showing wear rates for Examples 1, 2, and 3;

[0032] Figure 8 Bar charts showing the conductivity of the coatings in Examples 4, 5, and 6, and Comparative Examples;

[0033] Figure 9 XRD patterns of coatings in Examples 4, 5, and 6 (comparative examples);

[0034] Figure 10 Examples and comparative examples 4, 5 and 6 show the surface morphology of the coatings.

[0035] Figure 11 The following are bar charts showing the conductivity of the coatings in Examples 4, 5, and 6, and Comparative Examples 6.

[0036] Figure 12 The following are bar charts showing the microhardness of the coatings in Examples 4, 5, and 6, and Comparative Examples 6.

[0037] Figure 13 The above are bar graphs showing the coating adhesion of the embodiments and comparative examples 4, 5, and 6.

[0038] Figure 14 The current-carrying friction coefficient (COF) curves for the coatings in Examples 4, 5, and 6 are shown for both the embodiments and comparative examples.

[0039] Figure 15 The following are bar charts showing the wear rate of the examples and comparative examples 4, 5, and 6. Detailed Implementation

[0040] The above-mentioned and other technical features and advantages of the present invention will be described in more detail below with reference to the accompanying drawings.

[0041] Example

[0042] Step S1: Mix 4% (by weight) of polyvinyl alcohol (PVA) and 10% (by weight) of 1-octanol with the Ti2AlC powder. Add the mixture to an alumina ball mill jar at a Ti2AlC to deionized water weight ratio of 2:3. Ball mill for 4 hours at a speed of 360 r / min to obtain a slurry.

[0043] Step S2: Spray granulation is performed on the slurry obtained in step S1 to obtain agglomerated powder, which is then vacuum sintered at a temperature of 1300 ℃. The agglomerated powder after vacuum sintering needs to be sieved and classified to obtain a particle size in the range of 25~71 μm.

[0044] Step S3: Mix the powder sieved in step S2 with Cu in a ratio of 20% Ti2AlC powder and 80% metallic Cu powder, wherein the Cu powder has a particle size of 15~45 μm.

[0045] Step S4: Roughen the substrate by sandblasting.

[0046] Step S5: Prepare a composite coating on the substrate using high-velocity oxygen flame (HVOF) spraying technology. The process parameters are: kerosene flow rate 27 L / h, oxygen flow rate 53 m³ / h. 3 / h, powder feed rate 30 g / min, step distance 3 mm, spraying distance 320 mm, spray gun moving speed 800 mm / min.

[0047] Comparative Example 0

[0048] Step S1: Mix 4% (by weight) of polyvinyl alcohol (PVA) and 10% (by weight) of 1-octanol with Ti2AlC powder. Add the mixture to an alumina ball mill jar at a Ti2AlC to deionized water weight ratio of 2:3. Ball mill for 4 hours at a speed of 360 r / min to obtain a slurry.

[0049] Step S2: Spray granulation is performed on the slurry obtained in step S1 to obtain agglomerated powder, which is then vacuum sintered at a temperature of 1300 ℃. The agglomerated powder after vacuum sintering needs to be sieved and classified to obtain a particle size in the range of 25~71 μm.

[0050] Step S3: Mix the powder sieved in step S2 with Cu in a ratio of 20% Ti2AlC powder and 80% metallic Cu powder, wherein the Cu powder has a particle size of 15~45 μm.

[0051] Step S4: Roughen the substrate by sandblasting.

[0052] Step S5: Prepare a composite coating on the substrate using atmospheric plasma spraying (APS) technology. The process parameters are: power of 35 kW, current of 600 A, main gas of 35 L / min, powder feed rate of 20 g / min, spraying distance of 120 mm, step distance of 3 mm, and spray gun moving speed of 800 mm / min.

[0053] Comparative Example 1

[0054] Step S1: Mix 4% (by weight) of polyvinyl alcohol (PVA) and 10% (by weight) of 1-octanol with Ti2AlC powder. Add Ti2AlC to an alumina ball mill jar at a weight ratio of 2:3 (by weight of deionized water), and ball mill for 4 hours at a speed of 360 r / min to obtain a slurry.

[0055] Step S2: Spray granulation is performed on the slurry obtained in step S1 to obtain agglomerated powder, which is then vacuum sintered at a temperature of 1300 ℃. The agglomerated powder after vacuum sintering needs to be sieved and classified to obtain a particle size in the range of 25~71 μm.

[0056] Step S3: Mix the powder sieved in step S2 with Cu in a ratio of 20% Ti2AlC powder and 80% metallic Cu powder, wherein the Cu powder has a particle size of 15~45 μm.

[0057] Step S4: Roughen the substrate by sandblasting.

[0058] Step S5: Prepare a composite coating on the substrate using high-velocity oxygen flame (HVOF) spraying technology. The process parameters are: kerosene flow rate 23 L / h, oxygen flow rate 53 m³ / h. 3 / h, powder feed rate 30 g / min, step distance 3 mm, spraying distance 320 mm, spray gun moving speed 800 mm / min.

[0059] Comparative Example 2

[0060] Step S1: Mix 4% (by weight) of polyvinyl alcohol (PVA) and 10% (by weight) of 1-octanol with Ti2AlC powder. Add Ti2AlC to an alumina ball mill jar at a weight ratio of 2:3 (by weight of deionized water), and ball mill for 4 hours at a speed of 360 r / min to obtain a slurry.

[0061] Step S2: Spray granulation is performed on the slurry obtained in step S1 to obtain agglomerated powder, which is then vacuum sintered at a temperature of 1300 ℃. The agglomerated powder after vacuum sintering needs to be sieved and classified to obtain a particle size in the range of 25~71 μm.

[0062] Step S3: Mix the powder sieved in step S2 with Cu in a ratio of 20% Ti2AlC powder and 80% metallic Cu powder, wherein the Cu powder has a particle size of 15~45 μm.

[0063] Step S4: Roughen the substrate by sandblasting.

[0064] Step S5: Prepare a composite coating on the substrate using high-velocity oxygen flame (HVOF) spraying technology. The process parameters are: kerosene flow rate 25 L / h, oxygen flow rate 53 m³ / h. 3 / h, powder feed rate 30 g / min, step distance 3 mm, spraying distance 320 mm, spray gun moving speed 800 mm / min.

[0065] Comparative Example 3

[0066] Step S1: Mix 4% (by weight) of polyvinyl alcohol (PVA) and 10% (by weight) of 1-octanol with the Ti2AlC powder. Add the mixture to an alumina ball mill jar at a Ti2AlC to deionized water weight ratio of 2:3. Ball mill for 4 hours at a speed of 360 r / min to obtain a slurry.

[0067] Step S2: Spray granulation is performed on the slurry obtained in step S1 to obtain agglomerated powder, which is then vacuum sintered at a temperature of 1300 ℃. The agglomerated powder after vacuum sintering needs to be sieved and classified to obtain a particle size in the range of 25~71 μm.

[0068] Step S3: Mix the powder sieved in step S2 with Cu in a ratio of 20% Ti2AlC powder and 80% metallic Cu powder, wherein the Cu powder has a particle size of 15~45 μm.

[0069] Step S4: Roughen the substrate by sandblasting.

[0070] Step S5: Prepare a composite coating on the substrate using high-velocity oxygen flame (HVOF) spraying technology. The process parameters are: kerosene flow rate 29 L / h, oxygen flow rate 53 m³ / h. 3 / h, powder feed rate 30 g / min, step distance 3 mm, spraying distance 320 mm, spray gun moving speed 800 mm / min.

[0071] Comparative Example 4

[0072] Step S1: Mix 4% (by weight) of polyvinyl alcohol (PVA) and 10% (by weight) of 1-octanol with Ti2AlC powder. Add Ti2AlC to an alumina ball mill jar at a weight ratio of 2:3 (by weight of deionized water), and ball mill for 4 hours at a speed of 360 r / min to obtain a slurry.

[0073] Step S2: Spray granulation is performed on the slurry obtained in step S1 to obtain agglomerated powder, which is then vacuum sintered at a temperature of 1300 ℃. The agglomerated powder after vacuum sintering needs to be sieved and classified to obtain a particle size in the range of 25~71 μm.

[0074] Step S3: Mix the powder sieved in step S2 with Cu in a ratio of 10% Ti2AlC powder and 90% metallic Cu powder, wherein the Cu powder has a particle size of 15~45 μm.

[0075] Step S4: Roughen the substrate by sandblasting.

[0076] Step S5: High-velocity oxygen flame (HVOF) spraying technology is used to prepare a composite coating on the substrate. The process parameters are: kerosene flow rate 27 L / h, oxygen flow rate 53 m³ / h. 3 / h, powder feed rate 30 g / min, step distance 3 mm, spraying distance 320 mm, spray gun moving speed 800 mm / min.

[0077] Comparative Example 5

[0078] Step S1: Mix 4% (by weight) of polyvinyl alcohol (PVA) and 10% (by weight) of 1-octanol with Ti2AlC powder. Add Ti2AlC to deionized water in an alumina ball mill jar at a weight ratio of 2:3. Ball mill for 4 hours at a speed of 360 r / min to obtain a slurry.

[0079] Step S2: Spray granulation is performed on the slurry obtained in step S1 to obtain agglomerated powder, which is then vacuum sintered at a temperature of 1300 ℃. The agglomerated powder after vacuum sintering needs to be sieved and classified to obtain a particle size in the range of 25~71 μm.

[0080] Step S3: Mix the powder sieved in step S2 with Cu in a ratio of 30% Ti2AlC powder and 70% metallic Cu powder, wherein the Cu powder has a particle size of 15~45 μm.

[0081] Step S4: Roughen the substrate by sandblasting.

[0082] Step S5: Prepare a composite coating on the substrate using high-velocity oxygen flame (HVOF) spraying technology. The process parameters are: kerosene flow rate 27 L / h, oxygen flow rate 53 m³ / h. 3 / h, powder feed rate 30 g / min, step distance 3 mm, spraying distance 320 mm, spray gun moving speed 800 mm / min.

[0083] Comparative Example 6

[0084] Step S1: Mix 4% (by weight) of polyvinyl alcohol (PVA) and 10% (by weight) of 1-octanol with Ti2AlC powder. Add Ti2AlC to deionized water in an alumina ball mill jar at a weight ratio of 2:3. Ball mill for 4 hours at a speed of 360 r / min to obtain a slurry.

[0085] Step S2: Spray granulation is performed on the slurry obtained in step S1 to obtain agglomerated powder, which is then vacuum sintered at a temperature of 1300 ℃. The agglomerated powder after vacuum sintering needs to be sieved and classified to obtain a particle size in the range of 25~71 μm.

[0086] Step S3: Mix the powder sieved in step S2 with Cu in a ratio of 40% Ti2AlC powder and 60% metallic Cu powder, wherein the Cu powder has a particle size of 15~45 μm.

[0087] Step S4: Roughen the substrate by sandblasting.

[0088] Step S5: Prepare a composite coating on the substrate using high-velocity oxygen flame (HVOF) spraying technology. The process parameters are: kerosene flow rate 27 L / h, oxygen flow rate 53 m³ / h. 3 / h, powder feed rate 30 g / min, step distance 3 mm, spraying distance 320 mm, spray gun moving speed 800 mm / min.

[0089] Figure 1 The XRD patterns of the coatings in the examples and comparative example 0 are shown. In comparative example 0, the Ti2AlC phase is clearly decomposed, while in the examples, no obvious decomposition of the Ti2AlC phase is found.

[0090] Figure 2The XRD patterns of the coatings in the examples and comparative examples 1, 2 and 3 are shown. No obvious decomposition of the Ti2AlC phase was found in the figures, and a small amount of TiC reinforcing phase was formed.

[0091] Figure 3 The images show SEM images of the coating surfaces of Examples 1, 2, and 3. As can be seen from the images, when the kerosene content is low, there are many unmelted particles in the coating, which will have a significant impact on the mechanical properties of the coating. When the kerosene content increases to 29 L / h, the powder is over-melted, and the over-melted powder is deposited as droplets on the substrate. The sputtered powder droplets make the coating surface uneven.

[0092] Figure 4 The images show bar charts of the microhardness of the coatings in Examples 1, 2, and 3, with the highest hardness value (228.2 HV) observed in Examples 1. 0.1 In contrast, the microhardness of the coatings in Comparative Examples 1 and 2 decreased due to the presence of more unmelted particles. In Comparative Example 3, the microhardness increased due to the increased amount of kerosene and the TiC phase generated by the decomposition of Ti2AlC.

[0093] Figure 5 The bar chart shows the adhesion strength of the coatings in Examples 1, 2, and 3. Comparative Examples 1 and 2 contain more unmelted particles, resulting in relatively low adhesion strength. As the amount of kerosene increases, the adhesion strength of the coatings also increases; the adhesion strength of the examples is 53.5 MPa.

[0094] Figure 6 The current-carrying friction coefficient curves of the coatings in the examples and comparative examples 1, 2 and 3 are shown. As the amount of kerosene increases, the friction coefficient of the coating gradually decreases. When the amount of kerosene exceeds 27, the friction coefficient of the coating gradually increases. The friction coefficient of the examples is 0.334.

[0095] Figure 7 The bar chart shows the wear rate of the coatings in the Example and Comparative Examples 1, 2, and 3. The wear rate of the Example is the lowest, at 9.5 × 10⁻⁶. -6 mm 3 (N·m) The coatings of Comparative Example 1 and Comparative Example 2 contained more unmelted particles, while the coating of Comparative Example 3 had a lower Ti2AlC phase content due to the increased kerosene content, and the wear rate was higher than that of the Examples.

[0096] Figure 8 The bar chart shows the conductivity of the coatings in the Examples and Comparative Examples 1, 2, and 3. The conductivity decreases with increasing kerosene content. The conductivity of the Examples is 27% IACS.

[0097] Figure 9The XRD patterns of the coatings in Examples 4, 5 and 6 are shown. As the MAX phase ratio increases, the Ti2AlC peak intensity also increases.

[0098] Figure 10 The SEM images of the coating cross sections of Examples 4, 5 and 6 are shown. The coatings are dense, have obvious layered structures, are free of defects such as pores, and are tightly bonded to the substrate. The gray (Ti2AlC / TiC) and black (Al2O3) content in the coatings increases with the increase of the MAX phase ratio.

[0099] Figure 11 The bar chart shows the conductivity of the coatings in Examples 1 and Comparative Examples 4, 5, and 6. The conductivity increases with increasing Ti2AlC phase ratio, and decreases accordingly. The conductivity of the Examples 1 is 27% IACS.

[0100] Figure 12 The bar charts for the microhardness of the coatings in Examples 4, 5 and 6 are shown. As the proportion of Ti2AlC phase increases, the amount of hard phase such as TiC generated by decomposition increases, and the microhardness of the coating also increases accordingly.

[0101] Figure 13 The bar charts for the coating adhesion of the Example and Comparative Examples 4, 5 and 6 show that the adhesion strength of the coating decreases proportionally with the increase of Ti2AlC. The adhesion strength of the Example is 53.5 MPa, which is not significantly different from that of Comparative Example 6.

[0102] Figure 14 The friction coefficient curves for the coatings in the Example and Comparative Examples 4, 5 and 6 are shown. The friction coefficient of the Example is 0.334.

[0103] Figure 15 The bar charts showing the wear rates of the coatings in Examples 1, 2, 3, and 4 (Comparative Examples 5 and 6) illustrate that the wear rate is significantly affected by the Ti2AlC ratio, with the Example 1 exhibiting the lowest wear rate at 9.5 × 10⁻⁶. -6 mm 3 (N·m).

[0104] The above description is merely a preferred embodiment of the present invention and is illustrative rather than restrictive. Those skilled in the art will understand that many changes, modifications, and even equivalents can be made within the spirit and scope defined by the claims of the present invention, all of which will fall within the protection scope of the present invention.

Claims

1. A method for preparing a current-carrying tribological wear protective coating with good electrical conductivity, characterized in that, Includes the following steps: S1, mix Ti2AlC with 4% polyvinyl alcohol by weight of Ti2AlC, 0.4% 1-octanol by weight of Ti2AlC and deionized water, and add the mixture to an alumina ball mill jar; S2, spray granulation is performed on the slurry obtained in step S1 to obtain agglomerated powder. Then, the agglomerated powder is sintered. After vacuum sintering, the agglomerated powder is sieved and classified to finally obtain Ti2AlC powder. S3, mix the Ti2AlC powder sieved in step S2 with Cu powder to obtain a mixed powder; S4, roughen the substrate by sandblasting; S5, a composite coating is prepared by spraying mixed powder onto the substrate after roughening in step S4 using supersonic flame spraying technology.

2. The method for preparing a current-carrying tribological wear protective coating with good electrical conductivity as described in claim 1, characterized in that, In step S1, the weight ratio of Ti2AlC to deionized water is 2:

3.

3. The method for preparing a current-carrying tribological wear protective coating with good electrical conductivity as described in claim 1, characterized in that, In step S1, Ti2AlC is in the form of flake powder with a purity greater than 99.5%.

4. The method for preparing a current-carrying tribological wear protective coating with good electrical conductivity as described in claim 1, characterized in that, In step S1, the ball milling time is 4 hours and the rotation speed is 360 r / min.

5. The method for preparing a current-carrying tribological wear protective coating with good electrical conductivity as described in claim 1, characterized in that, In step S2, the sintering temperature of vacuum sintering is 1300 ℃.

6. The method for preparing a current-carrying tribological wear protective coating with good electrical conductivity as described in claim 1, characterized in that, In step S2, the Ti2AlC powder obtained by sieving and grading has a particle size of 25~71 μm.

7. The method for preparing a current-carrying tribological wear protective coating with good electrical conductivity as described in claim 1, characterized in that, In step S3, the mass ratio of Ti2AlC powder is 10%~40%.

8. The method for preparing a current-carrying tribological wear protective coating with good electrical conductivity as described in claim 1, characterized in that, In step S5, the process parameters for supersonic flame spraying technology are: kerosene volume 23~29 L / h, oxygen flow rate 53 m³ / h. 3 / h, powder feed rate 30 g / min, step distance 3 mm, spraying distance 300 mm, spray gun moving speed 800 mm / min.

9. A current-carrying tribological wear protective coating with good electrical conductivity, prepared by the preparation method according to any one of claims 1 to 8.

10. The application of a current-carrying tribological protective coating with good electrical conductivity as described in claim 9 in a current-carrying tribological environment.

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