A wear-resistant coating material for frequency conversion rollers, its preparation method and application
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2026-06-30
- Publication Date
- 2026-08-14
AI Technical Summary
但近期因钨金属价格飞涨，含钨材料制造成本急剧攀升，对含钨涂层的生产成本造成极大影响；普通的激光熔覆马氏体不锈钢涂层耐磨性能较差，经其强化的冷床变频辊无法满足产线更换周期需求；高Cr铸铁整体生产成本较高、且废品率高
（1）室温下测试本申请所提供的变频辊耐磨涂层材料的制备方法制备得到的涂层材料耐磨性能，其磨痕截面近似三角形面积平均值相较于高Cr铸铁试样降低56%以上，相较于马氏体不锈钢试样降低54%以上；室温洛氏硬度平均值达到46HRC以上，显著提升了室温耐磨性能。
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Abstract
Description
Technical Field
[0001] This application relates to the field of high-temperature roller wear-resistant coating technology, and more specifically, to a wear-resistant coating material for frequency conversion rollers, its preparation method, and its application. Background Technology
[0002] The variable frequency roller of the cooling bed is a core high-temperature conveying device in the wire rod production line of the steel industry, connecting the exit of the finishing mill and the cooling bed body. It is responsible for the stable conveying of the rolled steel at 900-1000℃ at a speed of tens of meters per second, achieving speed matching with the mill and cooling bed through variable frequency speed regulation, promoting uniform cooling of the steel, and arranging it into neat rows. Its performance directly determines the surface quality of the wire rods, production efficiency, and the operational stability of the entire production line. It operates under extreme conditions of high-temperature impact, high-speed friction, alternating hot and cold temperatures, heavy-load fatigue, and oxidation corrosion. The roller surface temperature fluctuates drastically between 100-950℃, leading to high-temperature wear as the primary failure mode, along with problems such as thermal cracking, fatigue damage, bearing damage, and roller deformation.
[0003] Currently, most cooling bed inverter rollers used in wire rod production lines on the market use high-Cr cast iron, laser-clad tungsten carbide coating, or laser-clad martensitic stainless steel coating. However, due to the recent surge in tungsten metal prices, the manufacturing cost of tungsten-containing materials has risen sharply, significantly impacting the production cost of tungsten-containing coatings. Ordinary laser-clad martensitic stainless steel coatings have poor wear resistance, and the frequency conversion rollers reinforced with them cannot meet the production line's replacement cycle requirements. High-Cr cast iron has a high overall production cost and a high scrap rate. Summary of the Invention
[0004] To address the aforementioned problems, this application provides a method for preparing a wear-resistant coating material for frequency conversion rollers, comprising the following steps: Cobalt-based high-entropy alloy powder was obtained, and then pretreated, crushed, sieved, and dried to prepare cobalt-based high-entropy alloy powder material. Titanium carbide crushed material powder was prepared by batching, drying, powder mixing, high-temperature sintering, three-stage crushing and sieving. Cobalt-based high-entropy alloy powder and titanium carbide crushed material powder were mixed and granulated to prepare intermediate powder. Intermediate powder and martensitic stainless steel powder were dried separately, mixed, and then dried again to obtain the powder raw material for the wear-resistant coating material of frequency conversion roller.
[0005] Optionally, the cobalt-based high-entropy alloy powder comprises the following components in parts by mass: Co: 40-42 portions; Cr: 40-42 parts; Fe: 6-8 parts; Ni: 5-8 parts; Mo: 1-2 parts; W: 1-1.5 portions; C: 0.5-1 part; Total impurity elements: <0.5 parts; The total mass parts of the above components in the cobalt-based high-entropy alloy powder are 100 parts; Titanium carbide crushed powder comprises the following components by weight: Total carbon: 18.8-19.2 parts, of which free carbon: ≥0.2 parts; O: ≥0.2 parts; Ni: 1 portion; Mo: 2 copies; Nb: 2 portions; Fe: 0.5 parts; Titanium: Balance; The total mass fraction of the above components in the titanium carbide crushed material is 100 parts.
[0006] Optionally, the mass percentage of crushed titanium carbide in the intermediate powder is 28-30%; Martensitic stainless steel powder comprises the following components in parts by weight: C: 0.15-0.2 parts; Cr: 15-18 parts; Ni: 1.5-2 parts; Si: 1-1.5 parts; Mn: 0.1-0.3 parts; Mo: 1-1.5 parts; Total impurity elements: <1 part; Iron: Balance; The total mass fraction of the above components in martensitic stainless steel powder is 100 parts.
[0007] Optionally, the intermediate powder accounts for 20%-30% of the mass of the wear-resistant coating powder.
[0008] Optionally, the preparation of cobalt-based high-entropy alloy powder includes: washing with anhydrous ethanol more than 3 times, each time for 5-15 minutes, followed by vacuum drying to complete the pretreatment, and then ball milling for 2-4 hours at a ball-to-powder ratio of 1:1-2 and a rotation speed of 300-500 r / min to complete the crushing, screening the powder to 100-270 mesh, and drying at 90-100℃ for 2-12 hours to complete the preparation.
[0009] Optionally, the preparation of titanium carbide crushed material powder includes: drying the batch at 90-100℃ for 12-48 hours, then dry mixing it using a ball mill, and then firing the powder in a furnace; the fired material is initially crushed and passed through a 10-mesh sieve, and then the sieved powder is crushed a second time to collect 100-270 mesh powder as finished powder, and the powder on the 100-mesh sieve is collected for a third crushing, and the 100-270 mesh powder collected after the third crushing is mixed with the finished powder collected during the second crushing to obtain titanium carbide crushed material powder.
[0010] This application also provides a wear-resistant coating material for frequency conversion rollers, comprising the following components by weight: C: 1.3-1.45 parts; Si: 0.6-0.8 parts; Mo: 1.3-1.7 parts; Cr: 20-22 parts; Ni: 2-3 parts; Nb: 0.15-0.2 parts; Co: 5.5-9.5 parts; Ti: 4-5 portions; W: 0.15-0.25 portions P: ≤0.02 parts S: ≤0.02 parts; Al: ≤0.02 parts; V: ≤0.15 parts; Cu: ≤0.05 parts; Mn: ≤0.3 parts; Iron: Balance; The total mass of all the above ingredients is 100 parts.
[0011] This application also provides an application of a wear-resistant coating material for frequency converter rollers, which is used to prepare a coating on a frequency converter roller base material through a laser cladding process. The base material of the frequency converter roller is 42CrMo, which has been tempered and has a hardness of HB265-280.
[0012] Optionally, laser cladding includes pre-treating the variable frequency roller base material by sandblasting, acetone cleaning and preheating. Preheating includes preheating the variable frequency roller base material to 200-300°C before laser cladding. After the base material pre-treatment, double-layer cladding is performed. After double-layer cladding, the upper surface of the coating is ground by a grinding machine, and the thickness of the ground layer does not exceed 15%.
[0013] Optionally, the double-layer cladding process includes bottom cladding and top cladding. The laser power of the bottom cladding is 3000-3300W, the powder feeding speed is 18-20g / min, the oscillation speed is 70-100mm / s, the pitch is 1.5-2mm, and the cladding layer thickness is 2-3mm. The laser power for top cladding is 3000-3300W, the powder feeding speed is 18-20g / min, the oscillation speed is 70-80mm / s, the pitch is 1.5-2mm, and the cladding layer thickness is 2-3mm.
[0014] The beneficial effects of the wear-resistant coating material, preparation method, and application of the frequency converter roller provided in this application are as follows: (1) The wear resistance of the coating material prepared by the method of preparing the frequency conversion roller wear-resistant coating material provided in this application was tested at room temperature. The average area of the wear track cross section of the approximately triangular sample was reduced by more than 56% compared with the high Cr cast iron sample and by more than 54% compared with the martensitic stainless steel sample. The average Rockwell hardness at room temperature reached more than 46 HRC, which significantly improved the wear resistance at room temperature.
[0015] (2) The wear resistance of the coating material prepared by the method of preparing the variable frequency roller wear-resistant coating material provided in this application was tested at high temperature. The average area of the wear mark cross section of the coating material was reduced by more than 26% compared with the high Cr cast iron sample and by more than 60% compared with the martensitic stainless steel sample. The average room temperature Rockwell hardness reached more than 56 HRC, which significantly improved the high temperature wear resistance and high temperature hardness. Attached Figure Description
[0016] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments or the prior art will be briefly introduced below.
[0017] Figure 1 Metallographic image of the intermediate powder laser cladding coating provided in Embodiment 1 of this application; Figure 2 This is a test diagram of the wear track cross section of high-Cr cast steel at room temperature friction and wear test provided in Comparative Example 1 of this application; Figure 3 This is a test diagram of the wear track cross section of the martensitic stainless steel coating at room temperature friction and wear test provided in Comparative Example 2 of this application; Figure 4 The wear track cross section test diagram of the 10% intermediate powder mixed martensitic stainless steel coating at room temperature friction and wear test provided in Comparative Example 3 of this application; Figure 5 This is a test image of the wear track cross section of the 20% intermediate powder mixed martensitic stainless steel coating at room temperature friction and wear test provided in Example 1 of this application; Figure 6 This is a test image of the wear track cross section of the 30% intermediate powder mixed martensitic stainless steel coating at room temperature friction and wear test provided in Example 2 of this application; Figure 7Comparison diagrams of wear track width and depth of materials and coatings provided in Examples 1-2 and Comparative Examples 1-3 of this application at room temperature; Figure 8 Comparison of wear track cross-sectional area and Rockwell hardness for materials and coatings provided in Examples 1-2 and Comparative Examples 1-3 of this application at room temperature; Figure 9 Metallographic image of high-Cr cast steel provided in Comparative Example 1 of this application; Figure 10 Metallographic image of martensitic stainless steel coating provided in Comparative Example 2 of this application; Figure 11 Metallographic image of a 20% intermediate powder mixed martensitic stainless steel coating provided in Example 1 of this application; Figure 12 Metallographic image of a 30% intermediate powder mixed martensitic stainless steel coating provided in Example 2 of this application; Figure 13 This is a test diagram of the wear track cross section of high-Cr cast steel at 600℃ high temperature friction and wear test provided in Comparative Example 1 of this application; Figure 14 This is a cross-sectional view of the wear track of the martensitic stainless steel coating at 600°C, provided in Comparative Example 2 of this application. Figure 15 The wear track cross section test diagram of the 10% intermediate powder mixed martensitic stainless steel coating at 600℃ high temperature friction and wear test provided in Comparative Example 3 of this application; Figure 16 This is a test diagram of the wear track cross section of the 20% intermediate powder mixed martensitic stainless steel coating at 600°C, provided in Example 1 of this application. Figure 17 This is a test diagram of the wear track cross section of the 30% intermediate powder mixed martensitic stainless steel coating at 600°C, provided in Example 2 of this application. Figure 18 This is a diagram of a high-Cr cast steel sample after high-temperature wear at 600℃, provided in Comparative Example 1 of this application. Figure 19 This is a sample of martensitic stainless steel coating after high-temperature wear at 600℃, provided in Comparative Example 2 of this application. Figure 20 This is a sample of a 10% intermediate powder mixed martensitic stainless steel coating after high-temperature wear at 600℃, provided in Comparative Example 3 of this application. Figure 21 This is a sample image of a 20% intermediate powder mixed martensitic stainless steel coating after high-temperature wear at 600°C, as provided in Example 1 of this application. Figure 22This is a sample image of a 30% intermediate powder mixed martensitic stainless steel coating after high-temperature wear at 600°C, as provided in Example 2 of this application. Figure 23 Comparison diagrams of wear track width and depth of materials and coatings subjected to friction and wear tests at 600°C, provided in Examples 1-2 and Comparative Examples 1-3 of this application; Figure 24 Comparison of wear track cross-sectional area and Rockwell hardness for materials and coatings provided in Examples 1-2 and Comparative Examples 1-3 of this application under 600°C. Detailed Implementation
[0018] To make the technical problems, technical solutions, and beneficial effects to be solved by this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and are not intended to limit the scope of this application.
[0019] Example 1 This embodiment provides a method for preparing a wear-resistant coating material for frequency conversion rollers, including the following steps: Cobalt-based high-entropy alloy powder was obtained, and then pretreated, crushed, sieved and dried to prepare cobalt-based high-entropy alloy powder material. In this embodiment, the cobalt-based high-entropy alloy powder comprises the following components by mass: Co: 40.5 portions; Cr: 41.2 parts; Fe: 7.6 parts; Ni: 7.17 parts; Mo: 1.49 parts; W: 1.05 copies; C: 0.56 parts; The impurity elements are 0.42 parts V and 0.01 parts S.
[0020] The preparation of cobalt-based high-entropy alloy powder includes: washing with anhydrous ethanol 4 times for 5 minutes each time, followed by vacuum drying to complete the pretreatment, and then ball milling for 2 hours at a ball-to-powder ratio of 1:1 and a rotation speed of 300 r / min to complete the crushing, screening the powder to 100-270 mesh, and drying at 90℃ for 2 hours to complete the preparation.
[0021] Titanium carbide crushed powder is prepared through batching, drying, powder mixing, high-temperature sintering, three-stage crushing and screening. Titanium carbide crushed powder comprises the following components by weight: Total carbon: 19 parts, of which free carbon: ≥0.2 parts; O: 0.2 parts; Ni: 1 portion; Mo: 2 copies; Nb: 2 portions; Fe: 0.5 parts; Titanium: 75.3 parts; The total mass fraction of the above components in the titanium carbide crushed material is 100 parts.
[0022] The preparation of titanium carbide crushed material powder includes: after batching, drying at 90℃ for 12 hours, then dry mixing in a ball mill, and then firing the powder in a furnace; the fired material is initially crushed and passed through a 10-mesh sieve, and then the sieved powder is crushed a second time to collect 100-270 mesh powder as finished powder, and the powder on the 100-mesh sieve is collected for a third crushing. After the third crushing, the 100-270 mesh powder is collected and mixed with the finished powder collected during the second crushing to obtain titanium carbide crushed material powder.
[0023] Intermediate powder was prepared by mixing and granulating cobalt-based high-entropy alloy powder with titanium carbide crushed material. The intermediate powder consists of 28.4% titanium carbide crushed powder.
[0024] The intermediate powder and martensitic stainless steel powder are dried separately, then mixed, and then dried again to obtain the powder raw material for the wear-resistant coating material of the frequency converter roller.
[0025] Martensitic stainless steel powder comprises the following components in parts by weight: C: 0.17 parts; Cr: 17.83 parts; Ni: 1.61 parts; Si: 1.16 parts; Mn: 0.26 parts; Mo: 1.43 parts; Impurity elements include: Nb: 0.05 parts; Co: 0.07 parts; Ti: 0.02 parts; W: 0.03 copies; P: 0.02 copies; S: 0.02 parts; Al: 0.04 parts; V: 0.09 copies; Cu: 0.06 parts; Iron: Balance.
[0026] In this embodiment, the intermediate powder accounts for 20 parts by mass of the wear-resistant coating powder (correspondingly, the martensitic stainless steel powder accounts for 80 parts, and the total mass is 100 parts).
[0027] Based on the above method, the material composition of the wear-resistant coating material of the frequency converter roller prepared in this embodiment is shown in Table 4.
[0028] Example 2 The difference between this embodiment and Embodiment 1 is that in this embodiment, the intermediate powder accounts for 30 parts by mass of the wear-resistant coating powder (correspondingly, the martensitic stainless steel powder accounts for 70 parts, and the total mass is 100 parts).
[0029] The preparation of cobalt-based high-entropy alloy powder includes: washing with anhydrous ethanol 4 times for 15 minutes each time, followed by vacuum drying to complete the pretreatment, and then ball milling for 4 hours at a ball-to-powder ratio of 1:2 and a rotation speed of 500 r / min to complete the crushing, screening the powder to 100-270 mesh, and drying at 100℃ for 12 hours to complete the preparation.
[0030] Titanium carbide crushed powder is prepared through batching, drying, powder mixing, high-temperature sintering, three-stage crushing and screening. The preparation of titanium carbide crushed material powder includes: after batching, drying at 100℃ for 48 hours, then dry mixing in a ball mill, and then firing the powder in a furnace; the fired material is initially crushed and passed through a 10-mesh sieve, and then the sieved powder is crushed a second time to collect 100-270 mesh powder as finished powder, and the powder on the 100-mesh sieve is collected for a third crushing, and the 100-270 mesh powder collected after the third crushing is mixed with the finished powder collected during the second crushing to obtain titanium carbide crushed material powder.
[0031] Intermediate powder was prepared by mixing and granulating cobalt-based high-entropy alloy powder with titanium carbide crushed material. The intermediate powder and martensitic stainless steel powder are dried separately, then mixed, and then dried again to obtain the powder raw material for the wear-resistant coating material of the frequency converter roller.
[0032] Based on the above method, the material composition of the wear-resistant coating material of the frequency converter roller prepared in this embodiment is shown in Table 4.
[0033] Comparative Example 1 This comparative example directly used high-chromium cast iron for subsequent experimental testing. The material composition of this high-chromium cast iron is shown in Table 4.
[0034] Comparative Example 2 This comparative example directly uses martensitic stainless steel powder as the raw material for laser cladding to prepare a coating, and then conducts subsequent experimental tests. The material composition of the martensitic stainless steel powder is shown in Table 4.
[0035] Comparative Example 3 This comparative example uses 10% of the intermediate powder provided in Example 1 and 90% of martensitic stainless steel powder. The process and parameters of raw material preparation are consistent with those in Example 1. Laser cladding is used to prepare the coating, and then subsequent experimental tests are conducted. The material composition of the variable frequency roller wear-resistant coating material prepared in this example is shown in Table 4.
[0036] Experimental Test (1) Sample preparation In Examples 1-2 and Comparative Example 3, the intermediate powder and martensitic stainless steel powder were dried separately, mixed with a V-type powder mixer for 24 hours, sieved, and dried again to obtain the powders of Examples 1-2 and Comparative Example 3.
[0037] In Example 2, the martensitic stainless steel powder was subjected to the same treatment process as in Examples 1-2 and Comparative Example 3 to obtain the powder of Example 2.
[0038] The powders provided in Examples 1-2 and Comparative Examples 2-3 were laser-clad onto an 80×80×20mm Q345B steel plate using a circular spot LYR3050 robotic cladding workstation with two layers of 2mm laser cladding according to the process in Table 1. After grinding, the coating was ensured to remain at 3.5mm. The coated parts were then wire-cut and polished together with a high-Cr cast iron sample block that was cast in one piece, and then tested.
[0039] Table 1. Laser Cladding Process Parameters for Examples 1-2 and Comparative Examples 2-3
[0040] (2) Testing equipment The morphology and coating composition were analyzed using SEM and metallographic methods, including a Zeiss Sigma 300 electron microscope and a GX71 metallographic microscope. The material composition was determined using a spectrometer.
[0041] Rockwell hardness and Vickers hardness were tested by a Rockwell hardness tester and an MH-6 Vickers hardness tester, respectively.
[0042] High-temperature wear resistance was tested by creating wear tracks using the Tianrun Jinyu MS-HT1000 high-temperature friction and wear tester, and then performing wear track cross-section testing using the Hommel T8000 profilometer.
[0043] (3) Room temperature test and testing - friction and wear: The prepared samples were subjected to wear testing using a high-temperature friction and wear tester. Wear marks were created under the following conditions: φ4 silicon carbide ball, 2000g load, 6mm friction radius, 300r / min rotation speed, room temperature, and 60min test time. Then, a Holmer T8000 profilometer was used to test the wear mark cross-sections at four points (top, bottom, left, and right). The results are as follows: Figures 2-6 As shown.
[0044] The results of room temperature friction and wear tests and Rockwell hardness tests were statistically analyzed. Since the cross-sectional profile of the wear track is approximately triangular, its cross-sectional area is approximately the area of a triangle. The results are shown in Table 2, and the comparison graph of the results is shown below. Figures 7-8 As shown: Table 2. Results of room temperature wear tests in Examples 1-2 and Comparative Examples 1-3
[0045] It can be observed that, at room temperature, the wear resistance, from highest to lowest, is as follows: L7 (20% intermediate powder) > L12 (30% intermediate powder) > L3 (10% intermediate powder) > L17 (0% intermediate powder) > L0 (high Cr cast iron). The overall trend is that the more intermediate powder, the better the wear resistance. Among them, 20% intermediate powder has the best wear resistance, but its hardness is the lowest. The overall trend of hardness is exactly the opposite of that of wear resistance.
[0046] (4) Room temperature test and measurement - hardness / spectrum: The worn samples were then tested using a spectrometer and a Rockwell hardness tester (average of 5 points). The test results are shown in Tables 3 and 4. Table 3. Hardness test results of samples from Examples 1-2 and Comparative Examples 1-3 after room temperature wear tests.
[0047] Table 4. Spectroscopic material composition test results of Examples 1-2 and Comparative Examples 1-3
[0048] (5) Room temperature test and measurement - metallography Metallographic test results as follows Figure 1 , Figures 9-12 As shown, it can be observed that with the increase of intermediate powder, the amount of gray-black spherical (Ti,W)C solid solution metal ceramic hard phase increases and is dispersed, which improves the wear resistance of pure martensitic stainless steel.
[0049] (6) High temperature test and testing (600℃) - friction and wear The prepared samples were subjected to wear testing using a high-temperature friction and wear tester. The parameters were: φ4 silicon carbide ball, 2000g load, 6mm friction radius, 300r / min rotation speed, 600℃ test temperature, and 60min time to create wear tracks. After furnace cooling to 300℃, the samples were air-cooled to room temperature. Subsequently, a Holmer T8000 profilometer was used to test the wear track cross-sections at four points (top, bottom, left, and right). The results are as follows: Figures 13-17 As shown. The macroscopic morphology of the sample after the high-temperature friction and wear test is as follows. Figures 18-22 As shown.
[0050] The results of high-temperature friction and wear tests and room-temperature Rockwell hardness tests after high-temperature wear were statistically analyzed. Since the cross-sectional profile of the wear track closely resembles a triangle, its cross-sectional area was approximated as the area of a triangle. The results are shown in Table 5, and a comparison graph of the results is shown below. Figures 23-24 As shown.
[0051] Table 5. Results of wear tests at 600℃ for Examples 1-2 and Comparative Examples 1-3
[0052] It can be observed that, at 600℃, the wear resistance, from highest to lowest, is as follows: L7 (20% intermediate powder) > L12 (30% intermediate powder) > L0 (high Cr cast iron) > L3 (10% intermediate powder) > L17 (0% intermediate powder). The overall trend is that the more intermediate powder, the better the wear resistance. Among them, 20% intermediate powder has the best wear resistance and the highest room temperature Rockwell hardness after heat treatment. The overall trend of hardness is the same as that of wear resistance.
[0053] Conclusion: The addition of intermediate powder can enhance the high-temperature wear resistance of martensitic stainless steel coating. The combination of 20% intermediate powder and martensitic stainless steel has the best performance and is superior to the high-Cr cast iron widely used in frequency conversion rollers. The wear resistance at 600℃ is improved by 27.8%.
[0054] (7) High temperature test and testing (600℃) - Hardness The samples after high-temperature wear were tested using a Rockwell hardness tester (average of 6 points), and the test results are shown in Table 6.
[0055] Table 6. Hardness test results after wear tests at 600℃ for Examples 1-2 and Comparative Examples 1-3.
[0056] It can be observed that after heat treatment at 600℃ for 1 hour, the Rockwell hardness at room temperature, from highest to lowest, is as follows: Example 2 (30% intermediate powder) > Example 1 (20% intermediate powder) > Comparative Example 3 (10% intermediate powder) > Comparative Example 1 (high Cr cast iron) > Comparative Example 2 (martensitic stainless steel). The overall trend is that the more intermediate powder, the higher the room temperature Rockwell hardness after heat treatment, which is the opposite of the trend of room temperature hardness.
[0057] Example 6 This application also provides an application of a wear-resistant coating material for frequency converter rollers, which is used to prepare a coating on a frequency converter roller base material through a laser cladding process. The base material of the frequency converter roller is 42CrMo, which has been tempered and has a hardness of HB265-280.
[0058] Laser cladding involves pre-treating the variable frequency roller base material by sandblasting, acetone cleaning, and preheating. Preheating includes preheating the variable frequency roller base material to 200-300℃ before laser cladding. Double-layer cladding is performed after the base material pre-treatment.
[0059] The above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application, and should all be included within the protection scope of this application.
Claims
1. A method for preparing a wear-resistant coating material for a frequency conversion roller, characterized in that, Includes the following steps: Cobalt-based high-entropy alloy powder was obtained, and then pretreated, crushed, sieved, and dried to prepare cobalt-based high-entropy alloy powder material. Titanium carbide crushed material powder was prepared by batching, drying, powder mixing, high-temperature sintering, three-stage crushing and sieving. Cobalt-based high-entropy alloy powder and titanium carbide crushed material powder were mixed and granulated to prepare intermediate powder. Intermediate powder and martensitic stainless steel powder were dried separately, mixed, and then dried again to obtain the powder raw material for the wear-resistant coating material of frequency conversion roller.
2. The method for preparing the wear-resistant coating material for frequency conversion rollers according to claim 1, characterized in that: The cobalt-based high-entropy alloy powder comprises the following components by mass: Co: 40-42 portions; Cr: 40-42 parts; Fe: 6-8 parts; Ni: 5-8 parts; Mo: 1-2 parts; W: 1-1.5 portions; C: 0.5-1 part; Total impurity elements: <0.5 parts; The total mass fraction of the above components in the cobalt-based high-entropy alloy powder is 100 parts; The titanium carbide crushed powder comprises the following components in parts by weight: Total carbon: 18.8-19.2 parts, of which free carbon: ≥0.2 parts; O: ≥0.2 parts; Ni: 1 portion; Mo: 2 copies; Nb: 2 portions; Fe: 0.5 parts; Titanium: Balance; The total mass fraction of the above components in the titanium carbide crushed material is 100 parts.
3. The method for preparing the wear-resistant coating material for frequency conversion rollers according to claim 1, characterized in that: The mass percentage of the titanium carbide crushed material in the intermediate powder is 28-30%. The martensitic stainless steel powder comprises the following components in parts by weight: C: 0.15-0.2 parts; Cr: 15-18 parts; Ni: 1.5-2 parts; Si: 1-1.5 parts; Mn: 0.1-0.3 parts; Mo: 1-1.5 parts; Total impurity elements: <1 part; Iron: Balance; The total mass fraction of the above components in the martensitic stainless steel powder is 100 parts.
4. The method for preparing the wear-resistant coating material for frequency conversion rollers according to claim 1, characterized in that: The intermediate powder accounts for 20%-30% of the mass of the wear-resistant coating powder.
5. The method for preparing the wear-resistant coating material for frequency conversion rollers according to claim 1, characterized in that: The preparation of the cobalt-based high-entropy alloy powder includes: washing with anhydrous ethanol more than 3 times, each time for 5-15 minutes; vacuum drying after washing to complete the pretreatment; then ball milling for 2-4 hours at a ball-to-powder ratio of 1:1-2 and a rotation speed of 300-500 r / min to complete the crushing; screening the powder to 100-270 mesh; and drying at 90-100℃ for 2-12 hours to complete the preparation.
6. The method for preparing the wear-resistant coating material for frequency conversion rollers according to claim 1, characterized in that: The preparation of the titanium carbide crushed material powder includes: after batching, drying at 90-100℃ for 12-48h, then dry mixing in a ball mill, and then firing the powder in a furnace; the fired material is initially crushed and passed through a 10-mesh sieve, and then the sieved powder is crushed a second time to collect 100-270 mesh powder as finished powder, and the powder on the 100-mesh sieve is collected for a third crushing. After the third crushing, the 100-270 mesh powder is collected and mixed with the finished powder collected during the second crushing to obtain titanium carbide crushed material powder.
7. A wear-resistant coating material for frequency conversion rollers, characterized in that, Includes the following components by mass fraction: C: 1.3-1.45 parts; Si: 0.6-0.8 parts; Mo: 1.3-1.7 parts; Cr: 20-22 parts; Ni: 2-3 parts; Nb: 0.15-0.2 parts; Co: 5.5-9.5 parts; Ti: 4-5 portions; W: 0.15-0.25 portions P: ≤0.02 parts S: ≤0.02 parts; Al: ≤0.02 parts; V: ≤0.15 parts; Cu: ≤0.05 parts; Mn: ≤0.3 parts; Iron: Balance; The total mass of all the above ingredients is 100 parts.
8. The application of a wear-resistant coating material for frequency conversion rollers, characterized in that: This material is used to prepare a coating on a variable frequency roller base material through a laser cladding process. The variable frequency roller base material is made of 42CrMo and has been tempered to a hardness of HB265-280.
9. The application of the wear-resistant coating material for frequency conversion rollers according to claim 8, characterized in that: The laser cladding process includes pre-treating the variable frequency roller base material by sandblasting, acetone cleaning, and preheating. The preheating process includes preheating the variable frequency roller base material to 200-300°C before laser cladding. After the base pre-treatment, double-layer cladding is performed. After double-layer cladding, the upper surface of the coating is ground by a grinding machine, and the thickness of the ground layer does not exceed 15%.
10. The application of the wear-resistant coating material for frequency conversion rollers according to claim 9, characterized in that: The double-layer cladding process includes bottom cladding and top cladding. The laser power of the bottom cladding is 3000-3300W, the powder feeding speed is 18-20g / min, the oscillation speed is 70-100mm / s, the pitch is 1.5-2mm, and the cladding layer thickness is 2-3mm. The laser power of the top cladding layer is 3000-3300W, the powder feeding speed is 18-20g / min, the oscillation speed is 70-80mm / s, the pitch is 1.5-2mm, and the cladding layer thickness is 2-3mm.