High-temperature-resistant self-lubricating sliding block material and preparation method thereof

Abstract

The invention discloses a high-temperature-resistant self-lubricating sliding block material and a preparation method thereof. The high-temperature-resistant self-lubricating sliding block material is prepared from polyether-ether-ketone, carbon fibers, glass fibers, brass, graphite powder, polytetrafluoroethylene, nano Al2O3, modified POM and rare earth elements. The preparation method comprises the following steps: step 1, selecting and proportioning materials; step 2, preparing a modified POM material; 3, preparing a composite polyether-ether-ketone material; 4, mixing the materials; step 5, sintering and curing; step 6, surface treatment; according to the high-temperature-resistant self-lubricating sliding block material designed by the invention, the composite polyether-ether-ketone material is used as a base material, so that the high-temperature-resistant self-lubricating sliding block material has outstanding tribological characteristics and excellent sliding wear resistance and fretting wear resistance, particularly can keep relatively high wear resistance and low friction coefficient at 250 DEG C, and has excellent high-temperature resistance; through the carbon fibers embedded in the composite polyether-ether-ketone material, the fibers can be transferred to a dual friction surface in the friction contact process.

Description

Technical Field

[0001] The invention relates to the technical field of slider materials, in particular to a high-temperature resistant self-lubricating slider material and a preparation method thereof. Background Art

[0002] As a key mechanical component, sliders play an important role in many industries and fields. In the field of mechanical manufacturing and automation, sliders are often used in transmission systems, guide systems and positioning systems. For example, in equipment such as CNC machine tools, stamping machines and injection molding machines, sliders are used to support and guide moving parts to ensure precise position control and stable motion trajectory. In addition, sliders are also commonly used in conveyor belts and robot arms on automated production lines to achieve efficient material handling and processing operations. The selection of slider materials is crucial to the performance and life of mechanical components, especially when they need to withstand harsh conditions such as sliding friction, high temperature or high pressure.

[0003] Existing slider materials have the following defects: First, they have poor high temperature resistance. In high temperature environments, they are often prone to deformation, softening, or even failure, which seriously affects their stability and durability under high temperature working conditions. This defect limits the wide application of slider materials in high temperature industrial fields, such as heat treatment, thermoforming and other key application scenarios; second, they lack self-lubricating properties. During the sliding friction process, they need to rely on external lubricants to reduce the friction coefficient and wear, which not only increases operating costs, but may also cause equipment failure and performance degradation due to insufficient or improper use of lubricants. The lack of self-lubricating properties makes slider materials appear incapable in application environments that pursue high efficiency and low maintenance costs; third, the impact resistance and tensile strength need to be improved. When subjected to dynamic loads or sudden impacts, the integrity and stability of the structure may not be maintained, resulting in early damage or a sharp decline in performance. The low tensile strength also limits the application potential of slider materials in environments with large tensile stresses, affecting their reliability and durability as key mechanical components. Summary of the invention

[0004] The object of the present invention is to provide a high temperature resistant self-lubricating slider material and a preparation method thereof, so as to solve the problems raised in the above background technology.

[0005] To achieve the above object, the present invention provides the following technical solution: A high-temperature resistant self-lubricating slider material, the formula of which includes: polyether ether ketone, carbon fiber, glass fiber, brass, graphite powder, polytetrafluoroethylene, nano-Al2O3, modified POM and rare earth elements. The mass percentages of the respective components are: 40% - 50% of polyether ether ketone, 10% - 20% of carbon fiber, 5% - 15% of glass fiber, 1% - 5% of brass, 2% - 10% of graphite powder, 5% - 15% of polytetrafluoroethylene, 1% - 5% of nano-Al2O3, 5% - 15% of modified POM and 0.1% - 0.5% of rare earth elements.

[0006] As a further technical solution of the present invention, the mass percentages of the respective components are: 40% of polyether ether ketone, 10% of carbon fiber, 5% of glass fiber, 5% of brass, 10% of graphite powder, 10% of polytetrafluoroethylene, 5% of nano-Al2O3, 14.5% of modified POM and 0.5% of rare earth elements.

[0007] As a further technical solution of the present invention, the mass percentages of the respective components are: 45% of polyether ether ketone, 15% of carbon fiber, 5% of glass fiber, 1% of brass, 4% of graphite powder, 9.5% of polytetrafluoroethylene, 5% of nano-Al2O3, 15% of modified POM and 0.5% of rare earth elements.

[0008] As a further technical solution of the present invention, the rare earth elements include one or more of cerium, lanthanum, and scandium.

[0009] A preparation method of a high-temperature resistant self-lubricating slider material includes Step 1, material selection and proportioning; Step 2, preparation of modified POM material; Step 3, preparation of composite polyether ether ketone material; Step 4, material mixing; Step 5, sintering and curing; Step 6, surface treatment;

[0010] Among them, in the above Step 1, raw materials are prepared according to the formula proportion and corresponding pretreatment is carried out;

[0011] Among them, in the above Step 2, modified POM is prepared using talcum powder, CaCO3, mica, glass microspheres, nano-SiO2 and TPU;

[0012] Among them, in the above Step 3, a composite polyether ether ketone material is prepared from polyether ether ketone, carbon fiber and glass fiber;

[0013] Among them, in the above Step 4, the modified POM material, the composite polyether ether ketone material and the remaining materials are mixed, and the PTFE and fillers are fully mixed by the air flow pulverization method to ensure uniform dispersion of each component;

[0014] Among them, in the above Step 5, the mixed materials are sintered and polymerized to form a composite material;

[0015] In Step 6 above, surface treatment is carried out to further improve the lubrication performance and wear resistance of the slider material.

[0016] As a further technical solution of the present invention, in Step 2, first, the POM base resin and the selected modifiers are accurately weighed according to a preset ratio. The modifiers include talcum powder, CaCO3, mica, glass microspheres, nano-SiO2, and TPU. The ratio of each raw material is: 65∶7∶7∶4∶4∶2∶10. The raw materials are put into a high-speed mixer, and through high-speed rotation and friction, the two are uniformly mixed at the microscopic level, ensuring that the modifiers can be fully dispersed in the POM resin matrix to form a stable modified premix.

[0017] As a further technical solution of the present invention, in Step 2, next, the prepared modified premix is fed into an extruder. After high-temperature melting, high-pressure shearing, and uniform mixing, it is extruded from the die orifice of the extruder into continuous strips. Subsequently, these molten POM mixtures are rapidly cooled and solidified in cooling water to form regular granular materials, that is, modified POM particles. This process not only completes the plasticizing extrusion of the material but also realizes the tight combination between the modifier and the POM resin matrix.

[0018] As a further technical solution of the present invention, in Step 2, in order to further improve the physical and mechanical properties and chemical stability of the modified POM material, heat treatment operations are required. The heat treatment includes annealing treatment and high-temperature curing treatment steps, which help to eliminate the internal stress generated during the processing, thereby reducing the risk of deformation and cracking of the material during use. At the same time, it can also promote the further reaction or cross-linking between the modifier and the POM resin, enhancing the interfacial interaction force between the two, making the modification effect more lasting and significant.

[0019] As a further technical solution of the present invention, in Step 3, polyetheretherketone is preliminarily mixed with carbon fiber and glass fiber. The premix is put into a melt blending machine and heated and melted in a strictly controlled high-temperature environment. With the help of mechanical stirring force, all components are fully mixed evenly, and finally, a highly uniform and stable molten mixture is formed. After melt blending, the mixture is injected into the mold cavity through a high-precision injection molding machine. The material after injection into the mold is slowly cooled under the action of the cooling system, enabling the material to be fully cured and shaped, and finally obtaining a composite polyetheretherketone material product that meets the performance requirements.

[0020] As a further technical solution of the present invention, in Step 5, the mixed material and the high-strength copper nail plate are molded by compression together to form a preliminary shape. The material after compression molding is sintered and polymerized to make all components tightly combine to form a composite material.

[0021] Compared with the prior art, the beneficial effects of the present invention are as follows: The present invention designs a high-temperature resistant self-lubricating slider material, which uses a composite polyetheretherketone material as the base material, has outstanding tribological properties, excellent sliding wear resistance and fretting wear resistance. In particular, it can maintain high wear resistance and low friction coefficient at 250 °C, and has excellent high-temperature resistance. Through the carbon fibers embedded in the composite polyetheretherketone material, during the friction contact process, these fibers can transfer to the counter friction surface to form a highly efficient self-lubricating transfer film. This mechanism effectively reduces the frictional resistance and improves the overall movement smoothness, realizing the self-lubricating function of the slider material. At the same time, nano-Al2O3 particles are introduced as fillers. These particles act like tiny "anchor points" to effectively inhibit the creep phenomenon of the material, thereby reducing the actual contact area, further reducing the friction coefficient, improving the stability and durability of the material, and by adding modified POM material as a filler, effectively improving the impact resistance and tensile strength of the slider material, ensuring the reliability and durability of the slider material when applied in an environment with large tensile stress. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 is a flowchart of the method of the present invention;

[0023] Figure 2 is a flowchart of the preparation of the modified POM material;

[0024] Figure 3 is a flowchart of the preparation of the composite polyetheretherketone material. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0025] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0026] Please refer to the attached Figure 1 - attached Figure 3 , a technical solution provided by the present invention:

[0027] Example 1

[0028] A high-temperature resistant self-lubricating slider material, the formula includes: polyether ether ketone, carbon fiber, glass fiber, brass, graphite powder, polytetrafluoroethylene, nano-Al2O3, modified POM and rare earth elements. The mass percentages of each component are respectively: 40% of polyether ether ketone, 10% of carbon fiber, 5% of glass fiber, 5% of brass, 10% of graphite powder, 10% of polytetrafluoroethylene, 5% of nano-Al2O3, 14.5% of modified POM and 0.5% of rare earth elements; the rare earth elements include one or more of cerium, lanthanum, and scandium;

[0029] A preparation method of a high-temperature resistant self-lubricating slider material, including Step 1, material selection and proportioning; Step 2, preparation of modified POM material; Step 3, preparation of composite polyether ether ketone material; Step 4, material mixing; Step 5, sintering and curing; Step 6, surface treatment;

[0030] Among them, in the above Step 1, raw materials are prepared according to the formula proportion and corresponding pretreatment is carried out;

[0031] Among them, in the above Step 2, first, the POM base resin and the selected modifier are accurately weighed according to a preset ratio. The modifier includes talcum powder, CaCO3, mica, glass microspheres, nano-SiO2 and TPU. The proportion of each raw material is: 65∶7∶7∶4∶4∶2∶10. The raw materials are put into a high-speed mixer, and through high-speed rotation and friction, the two reach a uniform mixture at the microscopic level, which ensures that the modifier can be fully dispersed in the POM resin matrix to form a stable modified premix. Next, the prepared modified premix is sent into an extruder. After high-temperature melting, high-pressure shearing and uniform mixing, it is extruded from the die orifice of the extruder into continuous strips. Subsequently, these molten POM mixtures are quickly cooled and solidified in cooling water to form regular granular materials, that is, modified POM particles. This process not only completes the plasticizing extrusion of the material, but also realizes the tight combination between the modifier and the POM resin matrix. In order to further improve the physical and mechanical properties and chemical stability of the modified POM material, heat treatment operations are required. The heat treatment includes annealing treatment and high-temperature curing treatment steps, which help to eliminate the internal stress generated during the processing, thereby reducing the risk of deformation and cracking of the material during use. At the same time, it can also promote the further reaction or cross-linking between the modifier and the POM resin, enhancing the interfacial interaction force between the two, making the modification effect more lasting and significant;

[0032] In the above step 3, polyetheretherketone, carbon fiber and glass fiber are preliminarily mixed. The premix is put into a melt blending machine and heated and melted in a strictly controlled high-temperature environment. With the help of mechanical stirring force, all components are fully and evenly mixed to finally form a highly uniform and stable molten mixture. The mixture after melt blending is injected into the mold cavity through a high-precision injection molding machine. The material after injection into the mold is slowly cooled under the action of the cooling system, enabling the material to be fully solidified and shaped, and finally obtaining a composite polyetheretherketone material product that meets the performance requirements;

[0033] In the above step 4, the modified POM material, the composite polyetheretherketone material and the remaining materials are mixed, and the PTFE and the filler are fully mixed by the air flow pulverization method to ensure the uniform dispersion of each component;

[0034] In the above step 5, the mixed materials and the high-strength copper nail plate are molded by pressing to form a preliminary shape, and the material after molding by pressing is sintered and polymerized so that each component is tightly combined to form a composite material;

[0035] In the above step 6, surface treatment is carried out to further improve the lubrication performance and wear resistance of the slider material.

[0036] Example 2

[0037] A high-temperature resistant self-lubricating slider material, the formula includes: polyetheretherketone, carbon fiber, glass fiber, brass, graphite powder, polytetrafluoroethylene, nano-Al2O3, modified POM and rare earth elements. The mass percentages of each component are: 45% of polyetheretherketone, 15% of carbon fiber, 5% of glass fiber, 1% of brass, 4% of graphite powder, 9.5% of polytetrafluoroethylene, 5% of nano-Al2O3, 15% of modified POM and 0.5% of rare earth elements; the rare earth elements include one or more of cerium, lanthanum and scandium, and its preparation method is the same as that of Example 1.

[0038] Example 3

[0039] A high-temperature resistant self-lubricating slider material, the formula includes: polyetheretherketone, carbon fiber, glass fiber, brass, graphite powder, polytetrafluoroethylene, nano-Al2O3, modified POM and rare earth elements. The mass percentages of each component are: 42% of polyetheretherketone, 13% of carbon fiber, 8% of glass fiber, 3% of brass, 7.5% of graphite powder, 13% of polytetrafluoroethylene, 3% of nano-Al2O3, 10% of modified POM and 0.5% of rare earth elements; the rare earth elements include one or more of cerium, lanthanum and scandium, and its preparation method is the same as that of Example 1.

[0040] The specific component ratios of each example are as follows in the table:

[0041] Example 1 Example 2 Example 3 Polyetheretherketone / % 40 45 42 Carbon fiber / % 10 15 13 Glass fiber / % 5 5 8 Brass / % 5 1 3 Graphite powder / % 10 4 7.5 Polytetrafluoroethylene / % 10 9.5 13 <![CDATA[Nanometer Al2O3 / %]]> 5 5 3 Modified POM / % 14.5 15 10 Rare earth element / % 0.5 0.5 0.5

[0042] Based on the above, the advantages of the present invention are as follows: The present invention designs a high-temperature resistant self-lubricating slider material. By using a composite polyetheretherketone material as the base material, it has outstanding tribological properties, excellent sliding wear and fretting wear resistance. Even under the condition of an extremely high temperature of up to 250 °C, it can still maintain a high level of wear resistance and an extremely low coefficient of friction. This characteristic greatly broadens the boundary of its application field, especially its performance in high-temperature working environments is particularly prominent, with excellent high-temperature resistance. Through the carbon fibers embedded in the composite polyetheretherketone material, during the friction contact process, these fibers can transfer to the counter friction surface to form an efficient self-lubricating transfer film. This mechanism effectively reduces the frictional resistance and improves the overall movement smoothness. At the same time, in order to overcome the creep problem that may occur in PEEK materials at high temperatures, the present invention innovatively introduces nano-Al2O3 particles as fillers. These particles, like tiny "anchor points", effectively inhibit the creep phenomenon of the material, thereby reducing the actual contact area, further reducing the coefficient of friction, improving the stability and durability of the material, and by adding modified POM material as a filler, not only significantly enhances the impact resistance of the slider material, but also greatly improves its tensile strength, ensuring the application reliability and durability under the condition of bearing large tensile stresses. In summary, the high-temperature resistant self-lubricating slider material of the present invention, with its unique material composition and excellent performance, provides a more reliable and efficient choice for mechanical components in high-temperature and high-load working environments.

[0043] For those skilled in the art, it is obvious that the present invention is not limited to the details of the above exemplary embodiments, and can be implemented in other specific forms without departing from the spirit or basic characteristics of the present invention. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-restrictive. The scope of the present invention is defined by the appended claims rather than the above description. Therefore, all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be included in the present invention. Any reference signs in the claims should not be regarded as limiting the claims involved.

Claims

1. A high temperature resistant self-lubricating slider material, the formula of which includes: Polyetheretherketone, carbon fiber, glass fiber, brass, graphite powder, polytetrafluoroethylene, nano-Al2O3, modified POM and rare earth elements, characterized in that the mass percentages of the components are: 40% to 50% of polyetheretherketone, 10% to 20% of carbon fiber, 5% to 15% of glass fiber, 1% to 5% of brass, 2% to 10% of graphite powder, 5% to 15% of polytetrafluoroethylene, 1% to 5% of nano-Al2O3, 5% to 15% of modified POM and 0.1% to 0.5% of rare earth elements.

2. A high temperature resistant self-lubricating slider material according to claim 1, characterized in that: The mass percentages of the components are: 40% of polyetheretherketone, 10% of carbon fiber, 5% of glass fiber, 5% of brass, 10% of graphite powder, 10% of polytetrafluoroethylene, 5% of nano-Al2O3, 14.5% of modified POM and 0.5% of rare earth elements.

3. The high temperature resistant self-lubricating slider material according to claim 1, characterized in that: The mass percentages of the components are: 45% of polyetheretherketone, 15% of carbon fiber, 5% of glass fiber, 1% of brass, 4% of graphite powder, 9.5% of polytetrafluoroethylene, 5% of nano-Al2O3, 15% of modified POM and 0.5% of rare earth elements.

4. A high temperature resistant self-lubricating slider material according to claim 3, characterized in that: The rare earth element includes one or more of cerium, lanthanum and scandium.

5. A method for preparing a high temperature resistant self-lubricating slider material, comprising step 1, material selection and proportioning; step 2, preparation of modified POM material; step 3, preparation of composite polyetheretherketone material; step 4, material mixing; step 5, sintering and curing; step 6, surface treatment; characterized in that: In the above step 1, raw materials are prepared according to the formula ratio and corresponding pretreatment is performed; In the above step 2, talcum powder, CaCO3, mica, glass microspheres, nano-SiO2 and TPU are used to prepare modified POM; In the above step 3, a composite polyetheretherketone material is prepared by using polyetheretherketone, carbon fiber and glass fiber; In the above step 4, the modified POM material, the composite polyetheretherketone material and the remaining materials are mixed, and the PTFE and the filler are fully mixed by air flow milling method to ensure that the components are evenly dispersed; In the above step 5, the mixed materials are sintered and polymerized to form a composite material; In the above step six, in order to further improve the lubrication performance and wear resistance of the slider material, surface treatment is performed.

6. The method for preparing a high temperature resistant self-lubricating slider material according to claim 5, characterized in that: In the step 2, the POM base resin and the selected modifier are first accurately weighed according to a preset ratio, the modifier includes talcum powder, CaCO3, mica, glass beads, nano-SiO2 and TPU, and the ratio of each raw material is: 65:7:7:4:4:2:

10. The raw materials are put into a high-speed mixer, and the two are evenly mixed at a microscopic level through high-speed rotation and friction, thereby ensuring that the modifier can be fully dispersed in the POM resin matrix to form a stable modified premix.

7. The method for preparing a high temperature resistant self-lubricating slider material according to claim 6, characterized in that: In the step 2, the prepared modified premix is ​​then fed into an extruder, and after high-temperature melting, high-pressure shearing and uniform mixing, it is extruded from the die orifice of the extruder into continuous strips. Subsequently, the molten POM mixture is rapidly cooled and solidified in cooling water to form regular granular materials, i.e., modified POM particles. This process not only completes the plasticization extrusion of the material, but also realizes the close bonding between the modifier and the POM resin matrix.

8. The method for preparing a high temperature resistant self-lubricating slider material according to claim 7, characterized in that: In the step 2, in order to further improve the physical and mechanical properties and chemical stability of the modified POM material, a heat treatment operation is required. The heat treatment includes annealing and high-temperature curing steps, which helps to eliminate the internal stress generated during the processing, thereby reducing the risk of deformation and cracking of the material during use. At the same time, it can also promote further reaction or cross-linking of the modifier and the POM resin, enhance the interfacial interaction between the two, and make the modification effect more lasting and significant.

9. The method for preparing a high temperature resistant self-lubricating slider material according to claim 5, characterized in that: In the step three, polyetheretherketone is preliminarily mixed with carbon fiber and glass fiber, the premix is ​​placed in a melt blender, heated and melted under a strictly controlled high temperature environment, and all components are fully mixed with the help of mechanical stirring force to finally form a highly uniform and stable molten mixture. The mixture after melt blending is injected into the mold cavity by a high-precision injection molding machine. The material after injection into the mold is slowly cooled under the action of a cooling system so that the material can be fully solidified and shaped, and finally a composite polyetheretherketone material product that meets the performance requirements is obtained.

10. The method for preparing a high temperature resistant self-lubricating slider material according to claim 5, characterized in that: In the step five, the mixed material is molded together with a high-strength copper nail plate to form a preliminary shape, and the molded material is sintered and polymerized to make the components tightly combined to form a composite material.

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