Method for preparing FeCoV coating through laser cladding and coating

Abstract

The invention relates to a method for preparing a FeCoV coating based on laser cladding and the coating, and the method comprises the following steps: preparing spherical FeCoV alloy powder, and mixing 46-51% by mass of Co, 1-5% by mass of V and the balance of Fe metal powder to prepare the spherical FeCoV alloy powder with the particle size of 15-53 [mu] m; the surface of the base body is ground and polished, and absolute ethyl alcohol is used for ultrasonic cleaning; under the argon protective atmosphere, the FeCoV alloy powder is deposited on the surface of the base body through laser cladding, and the laser energy density E is controlled to range from 133 J / mm to 400 J / mm; and after fusion covering is completed, natural cooling is conducted to the room temperature, and the FeCoV alloy coating forming metallurgical bonding with the base body is obtained.

Description

Technical Field

[0001] This invention relates to the field of FeCoV alloy protective technology, and in particular to a method and coating for preparing FeCoV coatings based on laser cladding. Background Technology

[0002] 316L stainless steel, due to its excellent corrosion resistance, good mechanical properties, and biocompatibility, has been widely used in high-tech fields such as electronic equipment, chemical equipment, and marine engineering. However, due to its poor magnetic permeability, 316L stainless steel faces challenges in meeting the electromagnetic interference control requirements of electronic equipment housings and precision instruments. In the field of electronic communication equipment, materials must maintain their inherent mechanical properties while also possessing effective electromagnetic interference (EMI) shielding capabilities to ensure the protection of sensitive components.

[0003] In existing technologies, functional coatings are typically prepared on 316L surfaces using methods such as thermal spraying, magnetron sputtering, or chemical vapor deposition. However, these methods suffer from problems such as weak adhesion between the coating and the substrate, easy cracking or peeling of the coating, and difficulty in simultaneously achieving multiple properties (such as wear resistance and electromagnetic shielding). While laser cladding technology can produce coatings with good adhesion, current research has focused primarily on improving wear resistance or corrosion resistance, with less attention paid to enhancing electromagnetic shielding performance. Furthermore, it often uses soft magnetic materials with poor compatibility with 316L (such as certain Ni-Fe-Mo alloys), resulting in poor bonding performance.

[0004] The information disclosed in the background section is only for enhancing the understanding of the background of this invention, and therefore may contain information that does not constitute prior art known to those skilled in the art. Summary of the Invention

[0005] This invention provides a method and coating for preparing FeCoV coating based on laser cladding, which can significantly improve the electromagnetic shielding effectiveness and wear resistance of 316L stainless steel to meet the stringent requirements of high-tech industrial applications for the comprehensive performance of materials.

[0006] A method for preparing FeCoV coatings based on laser cladding includes:

[0007] Spherical FeCoV alloy powder was prepared by mixing 46-51% Co, 1-5% V and the balance Fe metal powder by mass percentage to prepare spherical FeCoV alloy powder with a particle size of 15-53 μm;

[0008] Substrate pretreatment: The substrate surface is ground and polished and ultrasonically cleaned with anhydrous ethanol;

[0009] Under an argon protective atmosphere, the FeCoV alloy powder was deposited on the substrate surface by laser cladding, and the laser energy density E was controlled to be 133–400 J / mm².

[0010] After cladding, the material is naturally cooled to room temperature to obtain an FeCoV alloy coating that forms a metallurgical bond with the substrate.

[0011] In the method for preparing FeCoV coating based on laser cladding, the laser energy density E=P / (V×d), where P is the laser power (W), V is the scanning speed (mm / s), and d is the spot diameter (mm).

[0012] In the method for preparing FeCoV coating based on laser cladding, the laser power is 800–1200W, the scanning speed is 1.5–3.0mm / s, the spot diameter is 2mm, the overlap rate is 45–55%, and the powder feeding speed is 10–20g / min.

[0013] In the method for preparing FeCoV coating based on laser cladding, the FeCoV alloy powder is prepared by ball milling for 6–8 hours at a speed of 300–500 r / min, with a ball-to-powder mass ratio of 5:1. The environment is a vacuum or inert atmosphere. After ball milling, the powder is dried at 100°C for 3 hours and then passed through a 150-mesh sieve.

[0014] In the method for preparing FeCoV coating based on laser cladding, the substrate is 316L stainless steel.

[0015] An FeCoV coating, prepared according to the method for preparing FeCoV coating based on laser cladding.

[0016] In the FeCoV coating described above, the microstructure of the FeCoV alloy coating exhibits a gradient transition structure from the interface to the surface, evolving from columnar crystals to equiaxed crystals.

[0017] The FeCoV coating described above exhibits an average electromagnetic shielding effectiveness ≥35dB, a microhardness ≥350HV, and a wear rate ≤5.0×10⁻⁶ in the X-band of 8.2–12.4 GHz. -6 mm 3 / N·m.

[0018] In the FeCoV coating described above, the phase composition of the FeCoV coating is α-Fe(Co,V) solid solution, and the average grain size is less than 5μm.

[0019] In the FeCoV coating described above, the highest saturation magnetization of the FeCoV coating is 213 emu / g.

[0020] Compared with existing technologies, this invention has the following advantages: This invention achieves a simultaneous and significant improvement in the electromagnetic shielding effectiveness and wear resistance of 316L stainless steel through a single coating and a single process (laser cladding), resolving the contradiction between functionality and mechanical properties that is difficult to balance in traditional technologies. Excellent interfacial bonding is achieved; both the selected FeCoV alloy and 316L stainless steel are Fe-based systems, with sufficient interdiffusion of elements, forming a gradient transition interface for metallurgical bonding, avoiding the risk of coating peeling. A clearly defined process window is established, confirming that laser energy density is the most critical parameter for controlling the microstructure and performance of the coating. At a relatively low energy density (200 J / mm²), the process achieves optimal performance. 2 Under these conditions, the finest equiaxed crystal structure can be obtained, thereby achieving grain refinement (Hall-Petch) strengthening and simultaneously optimizing magnetic and dielectric loss mechanisms. This is the fundamental reason for achieving superior overall performance. The resulting coating shielding effectiveness (37dB) far exceeds the industrial application threshold (30dB), and wear resistance is improved by an order of magnitude, providing a reliable surface engineering solution for the expanded application of 316L stainless steel in precision electronics, defense, and other fields. The laser cladding process is a near-net-shape forming process with high material utilization, process controllability, and easy automation. Attached Figure Description

[0021] Various other advantages and benefits of the present invention will become apparent to those skilled in the art upon reading the detailed description of the preferred embodiments below. The accompanying drawings are for illustrative purposes only and are not intended to limit the invention. It is obvious that the drawings described below are merely some embodiments of the invention, and those skilled in the art can obtain other drawings based on these drawings without any inventive effort. Furthermore, the same reference numerals denote the same parts throughout the drawings.

[0022] In the attached diagram:

[0023] Figure 1 The images show the SEM morphology (a), particle size distribution (b), XRD pattern (c), and schematic diagram (d) of the laser cladding equipment for FeCoV alloy powder.

[0024] Figure 2 These are the X-ray diffraction patterns of samples prepared in different embodiments;

[0025] Figure 3 The microhardness distribution (a), maximum and average hardness (b), friction coefficient curve (c), average friction coefficient (d), wear morphology (e), and wear volume (f) of the samples prepared in different embodiments are shown.

[0026] Figure 4 The changes in hysteresis loop and coercivity of samples prepared in different embodiments with energy density;

[0027] Figure 5 The absorption shielding effectiveness (a), reflection shielding effectiveness (b), and total shielding effectiveness (c) of the samples prepared in different embodiments are shown.

[0028] The present invention will be further explained below with reference to the accompanying drawings and embodiments. Detailed Implementation

[0029] Specific embodiments of the invention will now be described in more detail with reference to the accompanying drawings. While specific embodiments of the invention are shown in the drawings, it should be understood that the invention may be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this invention will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art.

[0030] It should be noted that certain terms are used in the specification and claims to refer to specific components. Those skilled in the art will understand that different terms may be used to refer to the same component. This specification and claims do not distinguish components based on differences in terminology, but rather on differences in function. The terms "comprising" or "including" used throughout the specification and claims are open-ended and should be interpreted as "comprising but not limited to." The following descriptions are preferred embodiments for carrying out the invention; however, these descriptions are for the purpose of understanding the general principles of the specification and are not intended to limit the scope of the invention. The scope of protection of this invention is determined by the appended claims.

[0031] To facilitate understanding of the embodiments of the present invention, further explanations and descriptions will be provided below with reference to the accompanying drawings and specific embodiments. The accompanying drawings do not constitute a limitation on the embodiments of the present invention.

[0032] like Figures 1 to 5 As shown, the method for preparing FeCoV coatings based on laser cladding includes the following steps:

[0033] Spherical FeCoV alloy powder was prepared by mixing 46-51% Co, 1-5% V and the balance Fe metal powder by mass percentage to prepare spherical FeCoV alloy powder with a particle size of 15-53 μm;

[0034] Substrate pretreatment: The substrate surface is ground and polished and ultrasonically cleaned with anhydrous ethanol;

[0035] Under an argon protective atmosphere, the FeCoV alloy powder was deposited on the substrate surface by laser cladding, and the laser energy density E was controlled to be 133–400 J / mm².

[0036] After cladding, the material is naturally cooled to room temperature to obtain an FeCoV alloy coating that forms a metallurgical bond with the substrate.

[0037] In a preferred embodiment of the method for preparing FeCoV coating based on laser cladding, the laser energy density E=P / (V×d), where P is the laser power (W), V is the scanning speed (mm / s), and d is the spot diameter (mm).

[0038] In a preferred embodiment of the method for preparing FeCoV coating based on laser cladding, the laser power is 800–1200W, the scanning speed is 1.5–3.0mm / s, the spot diameter is 2mm, the overlap rate is 45–55%, and the powder feeding speed is 10–20g / min.

[0039] In a preferred embodiment of the method for preparing FeCoV coating based on laser cladding, the FeCoV alloy powder is prepared by ball milling for 6–8 hours at a speed of 300–500 r / min, with a ball-to-powder mass ratio of 5:1, in a vacuum or inert atmosphere. After ball milling, the powder is dried at 100°C for 3 hours and then passed through a 150-mesh sieve.

[0040] In a preferred embodiment of the method for preparing FeCoV coatings based on laser cladding, the substrate is 316L stainless steel. FeCo alloy, as a soft magnetic material, possesses excellent magnetic properties, high saturation magnetization and coercivity, significant hardness, excellent wear resistance, and superior electromagnetic wave absorption capabilities. Since both FeCo alloy and 316L stainless steel are iron-based metals, they exhibit excellent interfacial compatibility and bonding performance. FeCo alloy can be used to enhance the electromagnetic shielding capability and wear resistance of 316L stainless steel.

[0041] An FeCoV coating, prepared according to the method for preparing FeCoV coating based on laser cladding.

[0042] In a preferred embodiment of the FeCoV coating, the microstructure of the FeCoV alloy coating exhibits a gradient transition structure from the interface to the surface, evolving from columnar crystals to equiaxed crystals.

[0043] In a preferred embodiment of the FeCoV coating, the FeCoV coating exhibits an average electromagnetic shielding effectiveness ≥35dB, a microhardness ≥350HV, and a wear rate ≤5.0×10⁻⁶ in the X-band of 8.2–12.4 GHz. -6 mm 3 / N·m.

[0044] In a preferred embodiment of the FeCoV coating, the phase composition of the FeCoV coating is α-Fe(Co,V) solid solution, and the average grain size is less than 5 μm.

[0045] In a preferred embodiment of the FeCoV coating, the highest saturation magnetization of the FeCoV coating is 213 emu / g.

[0046] In one embodiment, the FeCoV alloy powder is composed of the following raw materials by mass percentage: 46-51% Co, 1-5% V, and the balance Fe. A total of 100g of raw materials is weighed according to the stoichiometric ratio and added to a ball mill jar. 30ml of alcohol is added, and the mixture is then placed in a ball mill for thorough mixing. The ball-to-powder mass ratio is 5:1, the mixing time is 6-8 hours, the ball mill speed is 300-500 r / min, and the environment is vacuum, thereby obtaining FeCoV alloy powder. The composite powder is then dried in a vacuum drying oven at 100°C for 3 hours. The alloy powder is then passed through a 150-mesh powder sieve to obtain alloy powder with a particle size of 0.3-100μm.

[0047] Before laser cladding, the surface of the 316L stainless steel substrate is sanded to remove the surface oxide layer, and then ultrasonically cleaned in anhydrous ethanol to remove oil, water and other contaminants from the surface.

[0048] The laser spot diameter for laser cladding on the surface of 316L stainless steel substrate is 2mm. Both the protective gas and the powder feeding gas are high-purity argon. The flow rate of the protective gas is 10-20L / min, and the flow rate of the powder feeding gas is 1.5-2L / min.

[0049] The laser cladding process parameters for FeCoV alloy powder are as follows: laser power of 800-1200W, scanning speed of 1.5-3mm / s, powder feeding speed of 10.0-20.0g / min, and overlap rate of 45-55%.

[0050] The testing methods used in this embodiment are: microstructure testing, hardness testing, tribological wear performance testing, magnetic performance testing, and electromagnetic shielding performance testing. Microstructure testing: A high-resolution field emission scanning electron microscope (ZEISS-sigma300) equipped with an energy dispersive spectroscopy (Oxford Instruments UltimMax) was used to observe and analyze the microstructure and cross-sectional morphology of the sample. Hardness testing: A microhardness tester (MicroMet-510) was used to measure the cross-sectional hardness of the sample. The load was 200 N, and the holding time was 15 seconds. Measurement points were selected at equal intervals along the longitudinal direction of the coating, with a spacing of 50 μm between each two adjacent test points. Tribological wear performance testing: A reciprocating tribological wear tester (OptimolSRV-IV) was used to evaluate the wear resistance. A 6 mm diameter Si3N4 ball was used as the friction pair, the test load was 2 N, and the wear time was 30 min. An electronic balance (accuracy 0.001 g) was used to measure the mass of the sample before and after the test, and the average wear rate was calculated. Magnetic performance testing: Hysteresis loops were measured using a vibrating sample magnetometer (LakeShore 7404), with the test magnetic field range being -10kOe to 10kOe. Electromagnetic shielding performance testing: Electromagnetic interference shielding performance was tested in the frequency range of 8.2-12.4GHz using a vector network analyzer (N522B / N5244), and electromagnetic parameters (ε′, ε″, μ′, μ″) were simultaneously acquired using the 85071E material testing software.

[0051] Example 1

[0052] 1. Clamp the 316L stainless steel onto the fixing fixture, and use 1200-grit sandpaper to polish the area on the substrate surface to be clad to remove the oxide layer, exposing a bright and clean metal surface. Then, ultrasonically clean it in anhydrous ethanol to remove oil, water and other contaminants from the surface.

[0053] 2. Weigh 50g of Fe, Co, and V powder according to stoichiometry. The raw material composition by mass percentage is: 51% Co, 1% V, and the balance Fe. This is used to prepare FeCoV alloy powder. Add the powder to a ball mill jar and 30ml of alcohol, then place it in a ball mill and mill for 6 hours at a speed of 300r / min.

[0054] 3. After the powder has dried completely, add it to the laser cladding powder feeder. The diameter of the laser spot for laser cladding is 2mm. Both the protective gas and the powder feeding gas are high-purity argon. The flow rate of the protective gas is 20L / min, and the flow rate of the powder feeding gas is 2L / min.

[0055] 4. The laser cladding process parameters for FeCoV alloy powder are: laser power of 1200W, scanning speed of 1.5mm / s, powder feeding speed of 20.0g / min, overlap rate of 45%, and laser energy density of 400J / mm².

[0056] 5. The sample (S1) in Example 1 was subjected to hardness test, friction and wear performance test, magnetic performance test and electromagnetic shielding performance test. The test results are shown in Table 1.

[0057] Table 1

[0058]

[0059] Example 2

[0060] 1. Clamp the 316L stainless steel onto the fixing fixture, and use 1200-grit sandpaper to polish the area on the substrate surface to be clad to remove the oxide layer, exposing a bright and clean metal surface. Then, ultrasonically clean it in anhydrous ethanol to remove oil, water and other contaminants from the surface.

[0061] 2. Weigh 50g of Fe, Co, and V powder according to stoichiometry. The raw material composition by mass percentage is: 49% Co, 3% V, and the balance Fe. This is used to prepare FeCoV alloy powder. Add the powder to a ball mill jar and 30ml of alcohol, then place it in a ball mill and mill for 7 hours at a speed of 400r / min.

[0062] 3. After the powder has dried completely, add it to the laser cladding powder feeder. The diameter of the laser spot for laser cladding is 2mm. Both the protective gas and the powder feeding gas are high-purity argon. The flow rate of the protective gas is 15L / min, and the flow rate of the powder feeding gas is 1.7L / min.

[0063] 4. The laser cladding process parameters for FeCoV alloy powder are: laser power of 1000W, scanning speed of 2.5mm / s, powder feeding speed of 15.0g / min, overlap rate of 50%, and laser energy density of 200 J / mm².

[0064] 5. The sample (S2) in Example 2 was subjected to hardness test, friction and wear performance test, magnetic performance test and electromagnetic shielding performance test. The test results are shown in Table 2.

[0065] Table 2

[0066]

[0067] Example 3

[0068] 1. Clamp the 316L stainless steel onto the fixing fixture, and use 1200-grit sandpaper to polish the area on the substrate surface to be clad to remove the oxide layer, exposing a bright and clean metal surface. Then, ultrasonically clean it in anhydrous ethanol to remove oil, water and other contaminants from the surface.

[0069] 2. Weigh 50g of Fe, Co, and V powder according to stoichiometry. The raw material composition by mass percentage is: 46% Co, 5% V, and the balance Fe. This is used to prepare FeCoV alloy powder. Add the powder to a ball mill jar and 30ml of alcohol, then place it in a ball mill and mill for 8 hours at a speed of 500r / min.

[0070] 3. After the powder has dried completely, add it to the laser cladding powder feeder. The diameter of the laser spot for laser cladding is 2mm. Both the protective gas and the powder feeding gas are high-purity argon. The flow rate of the protective gas is 10L / min, and the flow rate of the powder feeding gas is 1.5L / min.

[0071] 4. The laser cladding process parameters for FeCoV alloy powder are: laser power of 800W, scanning speed of 3mm / s, powder feeding speed of 10.0g / min, overlap rate of 55%, and laser energy density of 133J / mm².

[0072] 5. The sample (S3) in Example 3 was subjected to hardness test, friction and wear performance test, magnetic performance test and electromagnetic shielding performance test. The test results are shown in Table 3.

[0073] Table 3

[0074]

[0075] Comparative Example 1

[0076] 1. Clamp the 316L stainless steel onto the fixing fixture, and use 1200-grit sandpaper to polish the area on the substrate surface to be clad to remove the oxide layer, exposing a bright and clean metal surface. Then, ultrasonically clean it in anhydrous ethanol to remove oil, water and other contaminants from the surface.

[0077] 2. Using uncoated 316L stainless steel as a control, hardness, friction and wear performance, magnetic properties, and electromagnetic shielding performance were tested. The results are shown in Table 4. Its electromagnetic shielding effectiveness was only 10-15 dB, and its wear resistance was far lower than all coated samples.

[0078] Table 4

[0079]

[0080] Figure 3 The images show the microhardness distribution (a), maximum and average hardness (b), friction coefficient curve (c), average friction coefficient (d), wear morphology (e), and wear volume (f) of samples prepared in different embodiments. Sample S2 exhibits the best overall performance: highest hardness (1.82 times that of the matrix), lowest friction coefficient (0.523, 39% lower than the matrix), and lowest wear rate (4.3 × 10⁻⁶). -6mm³ / N·m). Figure 4 The hysteresis loop and coercivity of the samples prepared in different embodiments vary with energy density. Sample S2 exhibits the highest saturation magnetization (213 emu / g). Figure 5 The figures show the absorption shielding effectiveness (a), reflection shielding effectiveness (b), and total shielding effectiveness (c) of the samples prepared in different embodiments. Electromagnetic shielding mechanism analysis indicates that the performance improvement stems from the high-density grain boundaries (enhanced interfacial polarization loss) resulting from the fine-grained structure at low energy density. As can be seen from the above embodiments, Embodiment 2 is the most preferred embodiment of the present invention, fully demonstrating the technical advantages of the present invention in synergistically improving the electromagnetic shielding and wear resistance of 316L stainless steel.

[0081] Furthermore, this invention selects the Fe-(46–51%)Co-(1–5%)V alloy system as the cladding material, which has multiple technical advantages: the introduction of Co element significantly improves the saturation magnetization of the alloy (as shown in Example 2, reaching 213 emu / g), enhances the material's magnetic loss capability against electromagnetic waves, and is the basis for achieving efficient electromagnetic shielding; V element, as a strong carbide forming element and grain refiner, can effectively inhibit grain growth at high temperatures and form dispersed carbonitride precipitates in the matrix, improving the coating's hardness and wear resistance; FeCoV alloy and 316L stainless steel are both iron-based materials, and during the laser cladding process, elements (Fe, Cr, Ni, etc.) can achieve sufficient interdiffusion, eliminate the interface energy barrier, and form a gradient transition layer without obvious defects, ensuring a strong metallurgical bond between the coating and the substrate, and avoiding the cracking and peeling problems common in traditional heterogeneous material coatings.

[0082] This invention discovers and verifies that laser energy density (E = P / (V×d)) is a key parameter for controlling the microstructure and properties of coatings, especially in the lower energy density range of 133–200 J / mm², where optimal overall performance can be obtained. Its technical benefits are manifested in the following ways: lower energy density means less heat input per unit volume and a faster cooling rate, leading to increased supercooling of the molten pool, a significantly increased nucleation rate, suppression of epitaxial growth of columnar crystals, and promotion of the formation of numerous fine equiaxed crystal structures (such as...) on the top of the coating. Figure 3 (as shown in (a)). According to the Hall-Petch relationship, grain refinement directly increases the material hardness (reaching 378 HV in Example 2, an 82% increase compared to the matrix), significantly enhancing resistance to plastic deformation and wear resistance; fine grains bring a large number of high-density grain boundaries, which become interface polarization centers, generating strong dipole relaxation and space charge polarization under the action of alternating electromagnetic fields, significantly enhancing dielectric loss (ε″); at the same time, the high-permeability α-Fe(Co,V) solid solution phase ensures good magnetic loss (μ″), and the synergistic effect of the two allows the coating to dissipate electromagnetic wave energy mainly through absorption and secondarily through reflection (e.g. Figure 5As shown in the figure, the total shielding effectiveness reaches 37 dB, far exceeding the threshold of industrial applications (30 dB); the lower energy density reduces the total heat input, reduces the difference in thermal expansion between the cladding layer and the substrate, effectively alleviates the accumulation of residual stress, prevents the generation of microcracks, and ensures the integrity of the coating and the reliability of long-term service.

[0083] The rational matching of laser power, scanning speed, spot diameter, powder feeding rate, and overlap rate ensures the stability of the cladding process and the uniformity of the coating: an overlap rate of 45–55% ensures that adjacent melt channels fully overlap, eliminates "groove" defects, and improves surface flatness and shielding continuity; argon protection (10–20 L / min) effectively isolates air, prevents oxidation of active elements such as Fe and Co, ensures the purity of the melt pool, and improves the density and magnetic properties of the coating; spherical powder and stable powder feeding (10–20 g / min) improve the stability of powder conveying and the quality of cladding, achieves near-net-shape forming, has high material utilization, and meets the requirements of green manufacturing.

[0084] Although embodiments of the present invention have been described above in conjunction with the accompanying drawings, the present invention is not limited to the specific embodiments and application fields described above. The specific embodiments described above are merely illustrative and instructive, and not restrictive. Those skilled in the art can make many other forms based on the guidance of this specification and without departing from the scope of protection of the claims of the present invention, and all of these are within the scope of protection of the present invention.

Claims

1. A method for producing a FeCoV coating based on laser cladding, characterized in that, The method comprises the following steps: Preparation of spherical FeCoV alloy powder, mixing metal powder of Co, V and the balance of Fe by mass percentage to prepare spherical FeCoV alloy powder; Pre-treatment of the substrate, polishing the surface of the substrate and ultrasonic cleaning with anhydrous ethanol; Under the protection of argon atmosphere, the FeCoV alloy powder is deposited on the surface of the substrate by laser cladding; After the completion of cladding, natural cooling to room temperature to obtain FeCoV alloy coating forming metallurgical bonding with the substrate.

2. The method for preparing FeCoV coating layer based on laser cladding according to claim 1, characterized in that, Preferably, the laser energy density E = P / (V x d), P is the laser power, W; V is the scanning speed, mm / s; d is the spot diameter, mm.

3. The method for preparing FeCoV coating layer based on laser cladding according to claim 1, characterized in that, The laser power is 800-1200 W, the scanning speed is 1.5-3.0 mm / s, the spot diameter is 2 mm, the overlap rate is 45-55%, and the powder feeding speed is 10-20 g / min.

4. The method for preparing FeCoV coating layer based on laser cladding according to claim 1, characterized in that, The FeCoV alloy powder is prepared by ball milling method, the ball milling time is 6-8 h, and the ball milling speed is 300-500 r / min.

5. The method for preparing FeCoV coating layer based on laser cladding according to claim 1, characterized in that, The mass ratio of the ball powder is 5:1, the environment is vacuum or inert atmosphere, the ball milling is dried at 100℃ for 3h and sieved through 150 mesh after ball milling.

6. A FeCoV coating, characterized in that, The FeCoV coating is prepared by the method according to any one of claims 1-5.

7. A FeCoV coating according to claim 6, wherein, The average electromagnetic shielding effectiveness of the FeCoV coating in the X-band of 8.2-12.4 GHz is ≥35 dB.

8. The FeCoV coating of claim 6, wherein, The microhardness of the FeCoV coating is ≥350 HV.

9. The FeCoV coating of claim 6, wherein, The FeCoV coating has a wear rate of ≤ 5.0 x 10 -6 mm 3 / N·m.

10. The FeCoV coating of claim 6, wherein, The maximum saturation magnetization of the FeCoV coating is 213 emu / g.

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