Wear-resistant material and method for its production and use

Abstract

The application provides a wear-resistant material and a preparation method and use thereof. The wear-resistant material for a TS120A molten iron car wear plate is prepared by mixing lithium base molybdenum disulfide grease with aluminum powder, magnesium aluminum silicate powder and AlSi12 alloy powder in a specific condition in sequence, which not only greatly reduces the cost of purchasing and processing the wear plate, but also realizes the safety of the molten iron car, and is suitable for wide range of popularization and application.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of materials, in particular to a wear-resistant material and a preparation method and use thereof. BACKGROUND

[0002] The TS120A molten iron car is an important molten iron transportation equipment for local steel enterprises. The molten iron car mainly comprises a framework, a wheel set, a spring device of an axle box and an automatic device of a foundation. The car adopts a wedge damping device, which can reduce and avoid strong impact on the spring device of the axle box, the upper center plate and other components during operation, and is an important component for maintaining stable operation of the vehicle. The wear plate on the wedge is installed on the wedge through a positioning boss and a split pin. During operation of the vehicle, the wear plate on the axle box and the inner guide frame moves relative to the wear plate on the wedge to convert vibration into heat energy. Long-term work will cause the wear plate on the axle box, the inner guide frame and the wedge to be worn and have grooves, and even cause the wear plate to fall off, which poses a great hidden danger to the safety of the vehicle.

[0003] In order to reduce the wear of the wear plate, the manufacturer generally adopts the method of replacing the wear plate and applying lubricating grease to reduce the friction coefficient between the wear plate on the inner guide frame and the wear plate on the wedge, thereby reducing the wear of the wear plate.

[0004] When the TS120A molten iron car is in a high-temperature (60-70℃) working environment, the ordinary lubricating grease will gradually liquefy and peel off from the wear plate after more than 30 minutes. The wear plate wear exceeds the limit rate by more than 96% during a section repair period of the TS120A molten iron car.

[0005] CN102050128A discloses a high polymer composite material side bearing wear plate. The plate main body is a double-layer structure. The upper layer is a wear-resistant layer made of wear-resistant material, and the lower layer is a reinforcing layer made of glass steel material. The wear-resistant material is made of the following raw materials in parts by weight: sepiolite fiber 12-22 parts, glass fiber 4-6 parts, kaolin 6-10 parts, aramid fiber 1.5-2.5 parts, graphite particles 5-9 parts, copper fiber 1.5-2.5 parts, titanium stone powder 0.5-1.5 parts, flake graphite 3-5 parts, bauxite 4-8 parts and inorganic composite fiber 0.5-1.5 parts. The friction coefficient of the high polymer composite material side bearing wear plate changes little under the influence of temperature and humidity, and the friction coefficient is stable, which is conducive to improving the stability of the elastic side bearing rotation resistance torque and further improving the stability and reliability of the running performance of heavy-load and speed-increasing freight cars.

[0006] CN101293997A discloses a railway freight car chute wear plate material, which is composed of a plurality of nylon materials blended together, and each component and weight ratio are as follows: nylon 6: 20-25 parts; nylon 66: 70-80 parts; nylon 12: 15-20 parts; nylon 1010: 30-40 parts. The chute wear plate made of the material has strength, stiffness and friction performance that can fully meet the use requirements of the freight car.

[0007] CN110305478A discloses a wear-resistant material, a preparation method thereof and a wear-resistant part. The wear-resistant material comprises the following raw materials in parts by weight: 70-90 parts of polyamide, 10-30 parts of polyether polyurethane, 20-30 parts of toughening agent, 5-15 parts of plant fiber, 1-3 parts of wear-resistant agent, 0.2-0.8 parts of crosslinking agent and 0.1-0.3 parts of antioxidant.

[0008] However, the above-mentioned wear plate material cannot be completely suitable for TS120A hot metal car, and its wear resistance needs to be further improved. SUMMARY

[0009] To solve the above technical problems, the present application provides a wear-resistant material, a preparation method thereof and use thereof. The wear-resistant material for TS120A hot metal car wear plate is prepared by mixing molybdenum disulfide lithium base grease with aluminum powder, magnesium aluminum silicate powder and AlSi12 alloy powder under specific conditions in sequence. The wear-resistant material has high temperature resistance and wear resistance, and has a wide application prospect.

[0010] To achieve this purpose, the present application adopts the following technical solutions:

[0011] In a first aspect, the present application provides a preparation method of a wear-resistant material, which comprises the following steps:

[0012] (1) The molybdenum disulfide lithium base grease and aluminum powder are first mixed to obtain a first mixed grease;

[0013] (2) The first mixed grease of step (1) and magnesium aluminum silicate powder are second mixed to obtain a second mixed grease;

[0014] (3) The second mixed grease of step (2) and AlSi12 alloy powder are third mixed and then cooled to obtain the wear-resistant material;

[0015] The humidity in the mixing process of steps (1)-(3) is 10%RH-20%RH.

[0016] The preparation method of the wear-resistant material is simple in operation, the high-temperature-resistant lithium molybdenum disulfide-based lubricating grease is used as a base, the aluminum powder, the magnesium aluminum silicate powder and the AlSi12 alloy powder are sequentially mixed under the environmental humidity of 10% RH-20% RH, and the wear-resistant material with high-temperature resistance and wear resistance is obtained. When the environmental humidity is low during the mixing process, the powder is prone to caking; when the environmental humidity is high during the mixing process, additional dehumidification equipment needs to be installed to make the environmental humidity meet the requirements, thereby increasing the preparation cost of the wear-resistant material.

[0017] The aluminum powder is used to increase the friction coefficient without wearing the wear plate, the magnesium aluminum silicate powder is used to reduce the tendency of the emulsion body to become thin or be damaged when the temperature is increased, and the AlSi12 alloy powder is used instead of other types of alloy powder because the AlSi12 alloy powder has the advantages of high wear resistance and small thermal expansion coefficient. When any one of the powders is missing, the wear resistance of the prepared wear-resistant material is reduced. The aluminum powder, the magnesium aluminum silicate powder and the AlSi12 alloy powder are sequentially mixed, and the purpose is to make the wear-resistant material have the best wear resistance in a high-temperature environment (60-70 DEG C). When the adding order of the raw materials is adjusted, i.e., the lithium molybdenum disulfide-based lubricating grease and the magnesium aluminum silicate powder are mixed first, then the aluminum powder is added and mixed, and finally the AlSi12 alloy powder is added and mixed, the ductility of the wear-resistant material is reduced.

[0018] In the mixing process of steps (1)-(3), the environmental humidity is 10% RH-20% RH, for example, it can be 10% RH, 12% RH, 14% RH, 15% RH, 18% RH or 20% RH, but it is not limited to the listed values, and other values not listed in the range are also applicable.

[0019] Preferably, the mass ratio of the lithium molybdenum disulfide-based lubricating grease, the aluminum powder, the magnesium aluminum silicate powder and the AlSi12 alloy powder is (55-65):(15-25):(13-23):(1-7), for example, it can be 55:15:13:1, 58:17:14:2, 60:20:18:2, 62:21:20:5, 64:23:21:6 or 65:25:23:7, but it is not limited to the listed values, and other values not listed in the range are also applicable; preferably, it is 60:20:18:2.

[0020] The mass ratio of the molybdenum disulfide lithium-based grease, the aluminum powder, the magnesium aluminum silicate powder and the AlSi12 alloy powder is preferably (55-65):(15-25):(13-23):(1-7), which has the advantage of excellent wear resistance in a high-temperature environment. When the content of the molybdenum disulfide lithium-based grease is low, the adsorption and energy absorption will decrease, and the wear plate will fall off. When the content of the molybdenum disulfide lithium-based grease is high, the film forming performance will decrease.

[0021] Preferably, the particle size of the aluminum powder in step (1) is 30-50 μm, for example, 30 μm, 32 μm, 35 μm, 40 μm, 45 μm or 50 μm, but is not limited to the listed values, and other values not listed in the range are also applicable.

[0022] Preferably, the temperature of the first mixing in step (1) is 90-95°C, for example, 90°C, 90.5°C, 91°C, 92°C, 93°C, 94°C or 95°C, but is not limited to the listed values, and other values not listed in the range are also applicable.

[0023] Preferably, the temperature of the first mixing in step (1) is 90-95°C, which has the effect of improving the ductility. When the temperature of the first mixing is high, the film forming performance will decrease. When the temperature of the first mixing is low, the ductility will decrease. The temperature of the first mixing is 90-95°C, which is higher than the temperature of the second mixing, 70-75°C, because the optimal ductility temperatures of the aluminum powder and the magnesium aluminum silicate powder are different.

[0024] Preferably, the stirring time after the first mixing is 30-60 s, for example, 30 s, 35 s, 40 s, 45 s, 50 s, 55 s or 60 s, but is not limited to the listed values, and other values not listed in the range are also applicable.

[0025] Preferably, the particle size of the magnesium aluminum silicate powder in step (2) is 500-600 mesh, for example, 500 mesh, 510 mesh, 530 mesh, 550 mesh, 580 mesh or 600 mesh, but is not limited to the listed values, and other values not listed in the range are also applicable.

[0026] Preferably, the temperature of the second mixing in step (2) is 70-75°C, for example, 70°C, 72°C, 73°C, 74°C or 75°C, but is not limited to the listed values, and other values not listed in the range are also applicable.

[0027] Preferably, the second mixing is stirred for 90-120s, for example, 90s, 95s, 100s, 105s, 110s or 120s, etc., but not limited to the listed values, and other values not listed in the range are also applicable.

[0028] Preferably, the particle size of the AlSi12 alloy powder in step (3) is 400-500 mesh, for example, 400 mesh, 420 mesh, 450 mesh, 470 mesh, 480 mesh or 500 mesh, etc., but not limited to the listed values, and other values not listed in the range are also applicable.

[0029] Preferably, the temperature of the third mixing is 110-120℃, for example, 110℃, 112℃, 115℃, 118℃ or 120℃, etc., but not limited to the listed values, and other values not listed in the range are also applicable.

[0030] Preferably, the temperature of the third mixing is 110-120℃, which increases the flowability of the anti-wear material. When the temperature of the third mixing is higher, the air tightness is too low and the flowability is too high; when the temperature of the third mixing is lower, the air tightness of the anti-wear material is too high and the flowability is reduced.

[0031] Preferably, the third mixing is stirred for 10-30s, for example, 10s, 15s, 20s, 25s, 28s or 30s, etc., but not limited to the listed values, and other values not listed in the range are also applicable.

[0032] Preferably, the cooling temperature is 26-45℃, for example, 26℃, 28℃, 30℃, 35℃, 40℃ or 45℃, etc., but not limited to the listed values, and other values not listed in the range are also applicable.

[0033] As a preferred technical solution of the present application, the preparation method comprises the following steps:

[0034] (1) The molybdenum disulfide lithium-based grease and the aluminum powder with a particle size of 30-50μm are mixed at a temperature of 90-95℃ and stirred for 30-60s to obtain a first mixed grease;

[0035] (2) The first mixed grease in step (1) and the magnesium aluminum silicate powder with a particle size of 500-600 mesh are mixed at a temperature of 70-75℃ and stirred for 90-120s to obtain a second mixed grease;

[0036] (3) the second mixed grease and the AlSi12 alloy powder with a particle size of 400-500 mesh are mixed at a third temperature of 110-120 DEG C, stirred for 10-30 s, and cooled at a temperature of 26-45 DEG C to obtain the wear-resistant material;

[0037] During the mixing of steps (1)-(3), the ambient humidity is 10-20% RH;

[0038] The mass ratio of the lithium-based molybdenum disulfide grease, the aluminum powder, the magnesium aluminum silicate powder and the AlSi12 alloy powder is (55-65):(15-25):(13-23):(1-7).

[0039] In a second aspect, the present application also provides a wear-resistant material prepared by the method for preparing a wear-resistant material according to the first aspect.

[0040] The wear-resistant material according to the present application can be applied in a high-temperature environment of 60-70 DEG C and has good wear resistance.

[0041] In a third aspect, the present application also provides a use of the wear-resistant material according to the second aspect, wherein the wear-resistant material is used for a TS120A molten iron car wear plate.

[0042] The wear-resistant material according to the present application used for a TS120A molten iron car wear plate has a wear-out rate of less than 2% and a wear plate shedding rate of zero in one segment repair period, which greatly reduces the cost of purchasing and processing the wear plate, solves the traffic hazards of the TS120A molten iron car caused by the wear-out of the wear plate, and realizes the safety of the equipment.

[0043] Compared with the prior art, the present application has at least the following beneficial effects:

[0044] The method for preparing the wear-resistant material according to the present application is simple in operation, and the wear-resistant material prepared by the method has good effects when used for a TS120A molten iron car wear plate, reduces the cost of purchasing the wear plate, realizes the safety of the molten iron car, and is suitable for wide range of popularization and application. DETAILED DESCRIPTION

[0045] In order to facilitate the understanding of the present application, the present application is illustrated by the following embodiments. Those skilled in the art should understand that the embodiments are only used to help understand the present application and should not be regarded as a specific limitation on the present application.

[0046] The present application is further described in detail below. However, the following examples are only simple examples of the present application and do not represent or limit the protection scope of the present application, and the protection scope of the present application is subject to the claims.

[0047] The following are typical but non-limiting examples of the present application:

[0048] Example 1

[0049] The embodiment provides a preparation method of a wear-resistant material, and the preparation method comprises the following steps:

[0050] (1) a lithium base grease of molybdenum disulfide and aluminum powder with a particle size of 50 μm are mixed at a first mixing temperature of 95 ℃ and stirred for 60 s to obtain a first mixed grease;

[0051] (2) the first mixed grease in step (1) and magnesium aluminum silicate powder with a particle size of 500 mesh are mixed at a second mixing temperature of 70 ℃ and stirred for 120 s to obtain a second mixed grease;

[0052] (3) the second mixed grease in step (2) and AlSi12 alloy powder with a particle size of 500 mesh are mixed at a third mixing temperature of 110 ℃ and stirred for 30 s, and then cooled at a temperature of 45 ℃ to obtain the wear-resistant material;

[0053] The environmental humidity in the mixing process of steps (1) to (3) is 20% RH;

[0054] The mass ratio of the lithium base grease of molybdenum disulfide, the aluminum powder, the magnesium aluminum silicate powder and the AlSi12 alloy powder is 60:20:18:2.

[0055] Embodiment 2

[0056] The embodiment provides a preparation method of a wear-resistant material, and the preparation method comprises the following steps:

[0057] (1) a lithium base grease of molybdenum disulfide and aluminum powder with a particle size of 40 μm are mixed at a first mixing temperature of 90 ℃ and stirred for 50 s to obtain a first mixed grease;

[0058] (2) the first mixed grease in step (1) and magnesium aluminum silicate powder with a particle size of 600 mesh are mixed at a second mixing temperature of 75 ℃ and stirred for 90 s to obtain a second mixed grease;

[0059] (3) the second mixed grease in step (2) and AlSi12 alloy powder with a particle size of 400 mesh are mixed at a third mixing temperature of 120 ℃ and stirred for 10 s, and then cooled at a temperature of 26 ℃ to obtain the wear-resistant material;

[0060] The environmental humidity in the mixing process of steps (1) to (3) is 10% RH;

[0061] The mass ratio of the lithium base grease of molybdenum disulfide, the aluminum powder, the magnesium aluminum silicate powder and the AlSi12 alloy powder is 55:25:13:7.

[0062] Embodiment 3

[0063] The embodiment provides a preparation method of a wear-resistant material, and the preparation method comprises the following steps:

[0064] (1) a first mixed lithium-based molybdenum disulfide grease and aluminum powder with a particle size of 30 μm are stirred for 30 s at a temperature of 92 ℃ to obtain a first mixed grease;

[0065] (2) the first mixed grease in step (1) and magnesium aluminum silicate powder with a particle size of 550 mesh are stirred for 100 s at a temperature of 72 ℃ to obtain a second mixed grease;

[0066] (3) the second mixed grease in step (2) and AlSi12 alloy powder with a particle size of 460 mesh are stirred for 20 s at a temperature of 113 ℃, and then cooled at a temperature of 30 ℃ to obtain the wear-resistant material;

[0067] The humidity in the mixing process of steps (1) to (3) is 12% RH;

[0068] The mass ratio of the lithium-based molybdenum disulfide grease, the aluminum powder, the magnesium aluminum silicate powder and the AlSi12 alloy powder is 65:15:19:1.

[0069] Example 4

[0070] The embodiment provides a preparation method of a wear-resistant material, and the preparation method is the same as that in example 1, except that the mass ratio of the lithium-based molybdenum disulfide grease, the aluminum powder, the magnesium aluminum silicate powder and the AlSi12 alloy powder is 50:30:18:2.

[0071] Example 5

[0072] The embodiment provides a preparation method of a wear-resistant material, and the preparation method is the same as that in example 1, except that the mass ratio of the lithium-based molybdenum disulfide grease, the aluminum powder, the magnesium aluminum silicate powder and the AlSi12 alloy powder is 70:10:18:2.

[0073] Example 6

[0074] The embodiment provides a preparation method of a wear-resistant material, and the preparation method is the same as that in example 1, except that the temperature of the first mixing is 80 ℃.

[0075] Example 7

[0076] The embodiment provides a preparation method of a wear-resistant material, and the preparation method is the same as that in example 1, except that the temperature of the first mixing is 100 ℃.

[0077] Comparative example 1

[0078] The comparative example provides a preparation method of the wear-resistant material, which is the same as that of Example 1 except that the order of steps (1) and (2) is changed, i.e., the molybdenum lithium disulfide-based lubricating grease and the magnesium aluminum silicate powder with a particle size of 500 mesh are mixed at a second temperature of 70°C, and then stirred for 120s, and then mixed with the aluminum powder with a particle size of 50μm at a first temperature of 95°C.

[0079] The wear-resistant materials prepared in the above examples and comparative examples are applied on the wear plates of the TS120A molten iron car with a thickness of 2mm, and a wear test is carried out at an environment of 60-70°C, and the results of the wear plate wear overrun rate and the wear plate falling rate in one segment repair period are shown in Table 1.

[0080] Table 1

[0081] Wear plate wear-out overrun rate (%) Wear plate drop-out rate (%) Example 1 0.08％ 0 Example 2 0.05％ 0 Example 3 0.01％ 0 Example 4 6％ 9％ Example 5 0.75％ 11％ Example 6 0.9％ 11％ Example 7 1％ 12％

[0082] From Table 1, it can be seen that:

[0083] (1) It can be seen from Examples 1-3 that the preparation method of the wear-resistant material provided by the present application is simple to operate, and when the wear-resistant material prepared is applied to the wear plate of the TS120A molten iron car, the wear plate wear overrun rate is less than 2%, and the wear plate falling rate is zero;

[0084] (2) It can be seen from Example 1 and Examples 4-5 that in Example 4, the content of the molybdenum lithium disulfide-based lubricating grease is low, which leads to an increase of the wear plate wear overrun rate to 6% and an increase of the wear plate falling rate to 9%; in Example 5, the content of the molybdenum lithium disulfide-based lubricating grease is high, which leads to an increase of the wear plate wear overrun rate to 0.75% and an increase of the wear plate falling rate to 11%;

[0085] (3) It can be seen from Example 1 and Examples 6-7 that in Example 6, the first mixing temperature is low, which leads to an increase of the wear plate wear overrun rate to 0.9% and an increase of the wear plate falling rate to 11%; in Example 7, the first mixing temperature is high, which leads to an increase of the wear plate wear overrun rate to 1% and an increase of the wear plate falling rate to 12%;

[0086] (4) It can be seen from Example 1 and Comparative Example 1 that in Comparative Example 1, the molybdenum lithium disulfide-based lubricating grease and the magnesium aluminum silicate powder are mixed, and then the aluminum powder is added for mixing, and finally the AlSi12 alloy powder is added for mixing, which leads to a decrease of the ductility of the wear-resistant material.

[0087] The applicant declares that the above description is only a specific embodiment of the present application, but the protection scope of the present application is not limited thereto, and those skilled in the art should understand that any changes or replacements within the technical scope disclosed by the present application can be easily thought of by those skilled in the art, and all fall within the protection scope and disclosure scope of the present application.

Claims

1. A method of making a wear resistant material, characterised by, The preparation method comprises the following steps: (1) the molybdenum disulfide lithium base grease and the aluminum powder are mixed for the first time to obtain the first mixed grease; (2) the first mixed grease in step (1) and the magnesium aluminum silicate powder are mixed for the second time to obtain the second mixed grease; (3) the second mixed grease in step (2) and the AlSi12 alloy powder are mixed for the third time and then cooled to obtain the wear-resistant material; The humidity in the mixing process of steps (1)-(3) is 10%RH-20%RH; the mass ratio of the molybdenum disulfide lithium base grease, the aluminum powder, the magnesium aluminum silicate powder and the AlSi12 alloy powder is (55-65):(15-25):(13-23):(1-7).

2. The production method according to claim 1, characterized by, The mass ratio of the molybdenum disulfide lithium base grease, the aluminum powder, the magnesium aluminum silicate powder and the AlSi12 alloy powder is 60:20:18:

2.

3. The preparation method according to claim 1, characterized in that, The particle size of the aluminum powder in step (1) is 30-50 μm.

4. The method of claim 1, wherein, The temperature of the first mixing in step (1) is 90-95°C.

5. The preparation method according to claim 1, characterized in that, The stirring time after the first mixing is 30-60 s.

6. The method of claim 1, wherein, The particle size of the magnesium aluminum silicate powder in step (2) is 500-600 mesh.

7. The preparation method according to claim 1, characterized in that, The temperature of the second mixing in step (2) is 70-75°C.

8. The method of claim 1, wherein, The stirring time after the second mixing is 90-120 s.

9. The method of claim 1, wherein, The particle size of the AlSi12 alloy powder in step (3) is 400-500 mesh.

10. The method of claim 1, wherein, The temperature of the third mixing is 110-120°C.

11. The method of claim 1, wherein, The stirring time after the third mixing is 10-30 s.

12. The method of claim 1, wherein, The cooling temperature is 26-45°C.

13. The method of claim 1, wherein, The preparation method comprises the following steps: (1) the molybdenum disulfide lithium base grease and the aluminum powder with a particle size of 30-50 μm are mixed for the first time at a temperature of 90-95°C and then stirred for 30-60 s to obtain the first mixed grease; (2) the first mixed grease in step (1) and the magnesium aluminum silicate powder with a particle size of 500-600 mesh are mixed for the second time at a temperature of 70-75°C and then stirred for 90-120 s to obtain the second mixed grease; (3) the second mixed grease in step (2) and the AlSi12 alloy powder with a particle size of 400-500 mesh are mixed for the third time at a temperature of 110-120°C and then stirred for 10-30 s, and then cooled at a temperature of 26-45°C to obtain the wear-resistant material; The humidity in the mixing process of steps (1)-(3) is 10%RH-20%RH; The mass ratio of the molybdenum disulfide lithium base grease, the aluminum powder, the magnesium aluminum silicate powder and the AlSi12 alloy powder is (55-65):(15-25):(13-23):(1-7).

14. A wear-resistant material prepared by the preparation method of the wear-resistant material according to any one of claims 1-13.

15. Use of the wear resistant material according to claim 14, characterized in that, The wear-resistant material is used for the wear plate of a TS120A molten iron car.