Wide-temperature-range polyether-ether-ketone-based self-lubricating composite material part for LPBF and forming method thereof

Abstract

The invention discloses a wide-temperature-range polyether-ether-ketone-based self-lubricating composite material part for LPBF and a forming method of the wide-temperature-range polyether-ether-ketone-based self-lubricating composite material part, and belongs to the technical field of additive manufacturing. The forming method comprises the steps that polyether-ether-ketone powder and molybdenum disulfide powder are pretreated according to different modes; after pretreatment, the two kinds of powder are mechanically mixed according to a specific proportion, and wide-temperature-range polyether-ether-ketone-based self-lubricating composite material powder is obtained; and carrying out printing forming on the polyether-ether-ketone-based self-lubricating composite material powder by adopting a laser powder bed melting (LPBF) specific process to obtain a wide-temperature-range polyether-ether-ketone-based self-lubricating composite material part. Molybdenum disulfide is adopted to enhance the friction and wear performance of polyether-ether-ketone in a wide temperature range, the printability of powder is improved through special pretreatment, and a high-performance wide-temperature-range polyether-ether-ketone-based self-lubricating composite material part suitable for high and low temperature extreme environments is obtained through forming by adopting specific LPBF processes such as multidirectional cross scanning and the like.

Description

Technical Field

[0001] The present invention belongs to the technical field of additive manufacturing, and in particular relates to a wide-temperature-range polyetheretherketone-based self-lubricating composite material part for LPBF and a forming method thereof. Background Art

[0002] Polyetheretherketone (PEEK) is a specialty engineering plastic with excellent performance, boasting exceptional mechanical strength, high-temperature resistance, corrosion resistance, and good biocompatibility. It is widely used in high-end manufacturing applications such as aerospace, medical devices, and electronics. With the advancement of additive manufacturing technology, the processing of PEEK using laser powder bed fusion (LPBF) has increasingly attracted attention from researchers and engineering applications. LPBF technology enables high-precision fabrication of complex structures, offers excellent process adaptability and design flexibility, and provides a new forming method for high-performance applications of PEEK.

[0003] However, pure PEEK material still faces a series of technical difficulties in the LPBF forming process. On the one hand, PEEK material has a high melting temperature, which places stringent requirements on parameters such as equipment temperature control, laser energy input, and powder laying. It is prone to problems such as insufficient melting, forming warping, and poor interlayer bonding, which restricts its further improvement in forming accuracy and mechanical properties. On the other hand, PEEK material has insufficient tribological performance over a wide temperature range and is prone to adhesive wear under extreme high and low temperature conditions (-150℃~150℃), which limits its application in scenarios such as space environments and moving components with extreme temperatures.

[0004] To improve its tribological properties at high and low temperatures, some studies have attempted to introduce solid lubricants, such as molybdenum disulfide (MoS2), into the PEEK matrix, enhancing the material's self-lubricating properties through physical mixing or co-modification. However, existing technologies often use lubricating phases to reduce powder flowability, particle agglomeration, and reduced forming process stability. Furthermore, this strategy of introducing solid lubricants into the PEEK matrix often lacks systematic optimization of specific powder materials tailored to the LPBF process characteristics. Consequently, achieving both performance and forming quality improvements solely through improved material composition is difficult.

[0005] In addition, existing technologies focus more on the construction of composite formulas, and lack systematic supporting measures for powder pretreatment, mixing uniformity control, LPBF forming process parameter setting and post-processing methods. As a result, the dimensional stability, self-lubricating performance and high and low temperature adaptability of the formed parts are limited, making it difficult to meet long-term service requirements under wide temperature ranges and complex working conditions.

[0006] Therefore, there is an urgent need to provide a wide-temperature range PEEK-based self-lubricating composite material forming method suitable for the LPBF process to achieve the coordinated optimization of part performance, forming quality and processing technology. Summary of the Invention

[0007] In order to overcome the shortcomings of the above-mentioned prior art, the purpose of the present invention is to provide a wide-temperature range PEEK-based self-lubricating composite material part and forming method for LPBF, so as to solve the problems of insufficient tribological performance and unstable forming of PEEK materials in LPBF forming in the prior art under a wide temperature range.

[0008] In order to achieve the above object, the present invention adopts the following technical solutions: The first object of the present invention is to provide a method for forming a wide-temperature-range PEEK-based self-lubricating composite material part for LPBF, characterized by comprising: PEEK powder and MoS2 powder were pretreated and then mixed evenly to obtain a wide temperature range PEEK-based self-lubricating composite material powder; Based on the part model, the wide-temperature-range PEEK-based self-lubricating composite material powder is used as raw material, and LPBF technology is adopted for printing and molding, and a wide-temperature-range PEEK-based self-lubricating composite material part is obtained after cooling.

[0009] Preferably, in the wide temperature range PEEK-based self-lubricating composite material powder, the PEEK powder is 85-95 wt% and the MoS2 powder is 5-15 wt%.

[0010] Preferably, the pretreatment includes: Take PEEK powder and perform high-temperature powder spreading process layer by layer in LPBF equipment (HT-LPBF 300). The powder layer thickness is 0.1mm, the powder spreading speed is 50-100mm / s, and the format temperature is 300-310℃. Take MoS2 powder and dry it in a vacuum drying oven (DZF-6050) at 150~200℃ for 6~8h.

[0011] Further preferably, the pretreated PEEK powder and MoS2 powder are mechanically mixed by a three-dimensional mixer (SYH-20L), the mechanical mixing speed is 200~300r / min, and the mixing time is 2~3h.

[0012] More preferably, the particle size of the PEEK powder is 50-100 μm, and the particle size of the MoS2 powder is 1-10 μm.

[0013] Preferably, during the LPBF printing process, the powder supply cylinder surface temperature is maintained at 240-280° C., the preheating temperature of the forming cylinder is 320-330° C., and the thickness of the pre-laid powder bed is 4-6 mm.

[0014] Preferably, the process parameters for printing using LPBF technology are: laser power of 15-18 W, scanning speed of 2500-3000 mm / s, layer thickness of 0.1 mm, and scanning spacing of 0.1 mm.

[0015] Preferably, the laser scanning in the printing process using the LPBF technology adopts a multi-directional cross scanning strategy, that is, each layer is scanned twice, the angle of the intra-layer scanning path is 60~90°, and the angle of the inter-layer scanning path is 30~60°.

[0016] Preferably, after the LPBF technology is used for printing and molding, the workpiece is subjected to a gradient heat treatment in the cylinder, the powder is continuously spread to bury the workpiece in the powder by 5~10mm, the width temperature is kept at 300~320℃ for 1~2h, and then the temperature is gradually reduced at a rate of 10℃ / min, and the temperature is kept for 0.5h every time the temperature drops by 30~50℃, until it is taken out after it drops to room temperature.

[0017] The second object of the present invention is to disclose a wide-temperature-range PEEK-based self-lubricating composite material part for LPBF produced by the above-mentioned forming method.

[0018] Compared with the prior art, the present invention has the following beneficial effects: The wide-temperature-range PEEK-based self-lubricating composite material parts for LPBF and the forming method thereof disclosed in the present invention have the advantage that the wide-temperature-range PEEK-based self-lubricating composite material parts prepared by the present invention can exhibit stable lubrication effects and low friction and wear performance in the range of extremely low temperatures to high temperatures. Compared with existing self-lubricating materials, MoS2 in the composite material is prone to interlayer slip under the action of shear force due to its unique layered crystal structure, and can form a stable lubricating film on the surface of the material. In addition, MoS2 can still maintain its interlayer structure stability at low temperatures, and has good chemical inertness and thermal stability under high temperature conditions. Therefore, the wide-temperature-range PEEK-based self-lubricating composite material has excellent self-lubricating ability in a wide temperature range, meeting the engineering application requirements of long cycles and no lubrication maintenance under extreme working conditions.

[0019] Furthermore, the powder ratio of the wide-temperature-range PEEK-based self-lubricating composite material of the present invention has the advantage of achieving synergistic optimization of self-lubricating properties and mechanical properties by regulating the mass percentage of the PEEK matrix and the molybdenum disulfide lubricating phase. This ratio design not only ensures the uniform dispersion of MoS2 in the matrix, avoiding forming defects caused by an excessive amount of lubricating phase, but also ensures that the continuous structure of PEEK is maintained, thereby achieving significant friction reduction and wear resistance while maintaining excellent mechanical strength. Compared with traditional composite materials, this ratio range improves the overall performance stability of the composite system, making it suitable for the manufacturing requirements of high-performance mechanical components.

[0020] Furthermore, the PEEK and MoS2 powders were subjected to high-temperature spreading and drying treatments before mixing, significantly improving the powder's fluidity and forming consistency. The high-temperature spreading of the PEEK powder helps eliminate adsorbed moisture and surface charge effects, preventing powder agglomeration, while the drying of the MoS2 effectively removes moisture and inhibits gas evolution during sintering, thereby reducing forming defects. Through this type of pretreatment, the present invention overcomes the problems of uneven forming and porosity that are common in multi-component powder systems used in additive manufacturing.

[0021] Furthermore, the chosen particle size combination of PEEK and MoS2 powders ensures excellent melt compatibility and distribution consistency during the powder spreading and laser melting processes. The PEEK powder's particle size facilitates layer-by-layer spreading, while the MoS2 powder's small particle size facilitates gap filling and uniform distribution within the matrix powder, forming lubrication channels. This optimized particle size ratio effectively reduces the porosity of the powder bed, improves build density, and promotes thermal conductivity stability in the melt pool, resulting in parts with excellent structural integrity and functionality.

[0022] Furthermore, by preheating the forming and powder supply cylinders, thermal stability control of the powder bed is achieved, effectively suppressing thermal deformation and cracking defects caused by temperature differences. Compared with traditional forming processes, this temperature control design significantly improves the thermal stability and structural consistency of composite materials during the selective laser melting process.

[0023] Furthermore, the systematic optimization of the laser power and scanning speed combination enables the composite powder to achieve a uniform and stable melt pool during processing, effectively preventing material ablation or insufficient melting. Appropriate layer thickness and scanning spacing further enhance the bonding strength and overall density between the melt channels. Compared to unoptimized processing parameters, the process combination provided by this invention improves the surface quality and internal structural density of the product, significantly reducing the probability of forming defects.

[0024] Furthermore, a multi-directional interleaved scanning path, with different scanning angles within and between layers, effectively overcomes the structural anisotropy caused by single-directional scanning during the forming process. This staggered path design helps to homogenize stress distribution in all directions, improving the mechanical stability and operational reliability of composite parts in all principal stress directions. Compared to unidirectional or bidirectional scanning methods, this scanning strategy is more suitable for the manufacture of high-precision functional components.

[0025] Furthermore, the finished component is embedded in powder and subjected to high-temperature insulation and gradient cooling. This effectively releases residual stress accumulated during the manufacturing process and prevents cracking or performance degradation caused by thermal stress during later use. The slow, staged cooling process further ensures the thermal stability of the material structure, improving the dimensional accuracy and long-term serviceability of the component. Compared with conventional rapid cooling methods, this post-processing solution can more effectively ensure the integrity and functional durability of the composite structure.

[0026] The wide-temperature-range PEEK-based self-lubricating composite material parts obtained by the preparation and forming methods provided by the present invention can ensure the excellent mechanical properties of PEEK itself while having excellent self-lubricating and tribological properties in a wide temperature range (-150°C~150°C). BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 This is a process flow chart of the method for preparing and forming a wide-temperature-range PEEK-based self-lubricating composite material for LPBF provided by the present invention; Figure 2 This is a process flow chart of a method for preparing and forming a wide-temperature-range PEEK-based self-lubricating composite material for LPBF provided by a specific embodiment of the present invention; Figure 3 It is the wide temperature range friction curve of the friction and wear specimens in the embodiments of the present invention and the comparative examples. DETAILED DESCRIPTION

[0028] In order to enable those skilled in the art to better understand the solutions of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts should fall within the scope of protection of the present invention.

[0029] It should be noted that the terms "first", "second", etc. in the description and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that the numbers used in this way can be interchanged where appropriate, so that the embodiments of the present invention described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions. For example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0030] See also Figure 1 The present invention provides a method for forming a wide-temperature-range PEEK-based self-lubricating composite material part for LPBF, comprising: S1: PEEK powder and MoS2 powder were pretreated in different ways; S2: Mechanically mixing the two powders in a specific ratio to obtain a wide-temperature-range PEEK-based self-lubricating composite powder; S3: The material is printed using a specific LPBF process to obtain a wide-temperature-range PEEK-based self-lubricating composite material part.

[0031] See also Figure 2 The present invention provides a method for forming a wide-temperature-range PEEK-based self-lubricating composite material part for LPBF with improved tribological properties, which specifically comprises the following steps: 1) PEEK powder was subjected to a high-temperature layer-by-layer calendering treatment in a LPBF machine (HT-LPBF 300) with a layer thickness of 0.1 mm, a calendering speed of 50-100 mm / s, and a sheet temperature of 300-310°C. The PEEK powder was recovered after the high-temperature calendering treatment. Prior to mixing, MoS2 powder was dried in a vacuum drying oven (DZF-6050) at 150-200°C for 6-8 hours. The particle size of the PEEK powder used was 50-100 μm, and the particle size of the MoS2 powder was 1-10 μm.

[0032] 2) In the wide-temperature-range PEEK-based self-lubricating composite powder, by mass, PEEK accounts for 85-95% and MoS2 accounts for 5-15%. The PEEK powder treated in step 1) and MoS2 powder are mechanically mixed using a three-dimensional mixer (SYH-20L) at a speed of 200-300 rpm for 2-3 hours.

[0033] 3) Before LPBF forming of wide-temperature-range PEEK self-lubricating composites, the powder bed preheating cylinder temperature was maintained at 320–330°C, the powder feed cylinder surface temperature was maintained at 240–280°C, and the pre-laid powder bed thickness was 4–6 mm. The LPBF forming process parameters were: laser power of 15–18 W, scanning speed of 2500–3000 mm / s, layer thickness of 0.1 mm, and scan spacing of 0.1 mm. The laser scanning strategy during LPBF forming was multi-directional cross-scanning, with two scans within each layer, with an angle of 60–90° between the two scans within the layer, and a scanning path angle of 30–60° between layers.

[0034] 4) After LPBF printing, the part is subjected to in-cylinder gradient heat treatment. Powder is continuously spread to bury the part in the powder by 5-10mm. The temperature of the printing surface is kept at 300-320℃ for 1-2 hours. Then the temperature is gradually reduced at a rate of 10℃ / min, and the temperature is kept for 0.5 hours every time the temperature drops by 30-50℃.

[0035] 5) After step 4) is completed, the temperature is cooled to room temperature, the powder is removed, and the wide-temperature-range PEEK-based self-lubricating composite material is obtained.

[0036] The methods of the present invention are further described below with reference to the accompanying drawings and examples. The following examples utilize conventional instruments and equipment in the art. Unless otherwise specified, the various raw materials and reagents used are conventional commercially available products, with specifications conventional in the art, or can be prepared or formulated by known methods or reagent instructions. Experimental procedures in the following examples, where specific conditions are not specified, generally follow conventional conditions or those recommended by the manufacturer.

[0037] Example In this embodiment, the method for forming a wide-temperature-range PEEK-based self-lubricating composite material part for LPBF includes the following steps: 1) PEEK powder was subjected to a high-temperature layer-by-layer calcination treatment in a LPBF (Low-Body Temperature Flux) machine (HT-LPBF 300) with a layer thickness of 0.1 mm, a calcination speed of 50–100 mm / s, and a sheet temperature of 300–310°C. The PEEK powder was recovered after calcination. MoS2 powder was dried in a vacuum drying oven (DZF-6050) at 150–200°C for 6–8 h before mixing. The particle size of the PEEK powder used was 50–100 μm, and the particle size of the MoS2 powder used was 1–10 μm.

[0038] 2) In the wide-temperature-range PEEK-based self-lubricating composite powder, polyetheretherketone (PEEK) accounts for 88% by mass, and MoS2 accounts for 12% by mass. The PEEK powder treated in step 1) and MoS2 powder were mechanically mixed in a three-dimensional mixer (SYH-20L) at a speed of 200-300 r / min for 2-3 hours.

[0039] 3) Before LPBF forming of wide-temperature-range PEEK-based self-lubricating composites, the powder bed preheating cylinder temperature was maintained at 320–330°C, the powder supply cylinder surface temperature was maintained at 240–280°C, and the pre-laid powder bed thickness was 4–6 mm. The LPBF forming process parameters were: laser power of 15–18 W, scanning speed of 2500–3000 mm / s, layer thickness of 0.1 mm, and scanning pitch of 0.1 mm. The laser scanning strategy during LPBF forming was multi-directional cross-scanning, with two scans within each layer, with an intra-layer angle of 60–90° and an inter-layer scanning path angle of 30–60°.

[0040] 4) After LPBF printing, the part is subjected to in-cylinder gradient heat treatment. Powder is continuously spread to bury the part 5-10 mm in the powder. The temperature is kept at 300-320 °C for 1-2 hours. Then, the temperature is gradually reduced at a rate of 10 °C / min, and the temperature is maintained for 0.5 hours every 30-50 °C drop.

[0041] 5) After step 4) is completed, the temperature is cooled to room temperature, the powder is removed, and the wide-temperature-range PEEK-based self-lubricating composite material is obtained.

[0042] Comparative Example 1 The conventional LPBF process for forming pure PEEK material includes the following steps: 1) Directly dry PEEK powder with a particle size of 50-75 μm at a drying temperature of 120-150 °C for 600-720 min.

[0043] 2) Pure PEEK material was subjected to LPBF forming. During the printing process, the powder bed preheating temperature was 325-335°C, the pre-laid powder bed thickness was 5 mm, the laser power was 14-16 W, the scanning speed was 2000-2500 mm / s, the layer thickness was 0.1 mm, the scanning spacing was 0.1 mm, the intra-layer scanning was once, and the inter-layer scanning angle was the same.

[0044] 3) After printing is completed, let the part cool naturally, clean the powder and remove the part to obtain a pure PEEK material part.

[0045] Comparative Example 2 The wide temperature range PEEK-based self-lubricating composite material powder that is directly mixed without pretreatment is formed using the LPBF process of the present invention, comprising the following steps: 1) PEEK powder with a particle size of 50-75 μm and MoS2 powder with a particle size of 1-10 μm were directly dried at a drying temperature of 120-150 °C for 600-720 min.

[0046] 2) In the wide-temperature-range PEEK-based self-lubricating composite powder, polyetheretherketone (PEEK) accounts for 88% by mass, and MoS2 accounts for 12% by mass. The PEEK powder treated in step 1) and MoS2 powder were mechanically mixed in a three-dimensional mixer (SYH-20L) at a speed of 200-300 r / min for 2-3 hours.

[0047] 3) Before LPBF forming of wide-temperature-range PEEK-based self-lubricating composites, the powder bed preheating cylinder temperature was maintained at 320–330°C, the powder supply cylinder surface temperature was maintained at 240–280°C, and the pre-laid powder bed thickness was 4–6 mm. The LPBF forming process parameters were: laser power of 15–18 W, scanning speed of 2500–3000 mm / s, layer thickness of 0.1 mm, and scanning pitch of 0.1 mm. The laser scanning strategy during LPBF forming was multi-directional cross-scanning, with two scans within each layer, with an intra-layer angle of 60–90° and an inter-layer scanning path angle of 30–60°.

[0048] 4) After LPBF printing, the part is subjected to in-cylinder gradient heat treatment. Powder is continuously spread to bury the part 5-10 mm in the powder. The temperature is kept at 300-320 °C for 1-2 hours. Then, the temperature is gradually reduced at a rate of 10 °C / min, and the temperature is maintained for 0.5 hours every 30-50 °C drop.

[0049] 5) After step 4) is completed, the temperature is cooled to room temperature, the powder is removed, and the wide-temperature-range PEEK-based self-lubricating composite material is obtained.

[0050] Comparative Example 3 The conventional LPBF process is performed on the pre-treated and mixed wide temperature range PEEK-based self-lubricating composite material powder, which includes the following steps: 1) PEEK powder was subjected to a high-temperature layer-by-layer calcination treatment in a LPBF (Low-Body Temperature Flux) machine (HT-LPBF 300) with a layer thickness of 0.1 mm, a calcination speed of 50–100 mm / s, and a sheet temperature of 300–310°C. The PEEK powder was recovered after calcination. MoS2 powder was dried in a vacuum drying oven (DZF-6050) at 150–200°C for 6–8 h before mixing. The particle size of the PEEK powder used was 50–100 μm, and the particle size of the MoS2 powder used was 1–10 μm.

[0051] 2) In the wide-temperature-range PEEK-based self-lubricating composite powder, polyetheretherketone (PEEK) accounts for 88% by mass, and MoS2 accounts for 12% by mass. The PEEK powder treated in step 1) and MoS2 powder were mechanically mixed in a three-dimensional mixer (SYH-20L) at a speed of 200-300 r / min for 2-3 hours.

[0052] 3) LPBF forming of a wide-temperature-range PEEK-based self-lubricating composite material was performed. During the printing process, the powder bed preheating temperature was 320-330°C, the pre-laid powder bed thickness was 5 mm, the laser power was 15-18 W, the scanning speed was 2500-3000 mm / s, the layer thickness was 0.1 mm, the scanning spacing was 0.1 mm, the intra-layer scanning was once, and the inter-layer scanning angle was the same.

[0053] 4) After printing is completed, let the part cool naturally, clean the powder and remove the part to obtain a pure PEEK material part.

[0054] Friction and wear performance test: The parts obtained in the above examples and comparative examples were subjected to friction and wear performance test. The friction curves are shown in Figure 3 , the test results are shown in Table 1: Table 1 Friction and wear performance test results of the examples and comparative examples

[0055] As can be seen from Table 1, the wide-temperature-range PEEK-based self-lubricating composite material obtained by adding MoS2 and pretreating the powder, and the parts prepared by a specific LPBF optimization process have much lower friction coefficients and wear rates in a wide temperature range of -150°C to 150°C than those of pure PEEK material formed by a conventional LPBF process, the self-lubricating composite material powder directly mixed without pretreatment formed by the LPBF process of the present invention, and the self-lubricating composite material powder mixed after pretreatment formed by a conventional LPBF process. The tribological properties of the PEEK material are greatly improved. The parts manufactured by this material and forming process can be used in extreme environments such as space, and have broad application prospects in the manufacture of high and low temperature resistant moving friction components.

[0056] The above content is only for explaining the technical idea of ​​the present invention and cannot be used to limit the protection scope of the present invention. Any changes made on the basis of the technical solution in accordance with the technical idea proposed by the present invention shall fall within the protection scope of the claims of the present invention.

Claims

1. A method for forming a wide-temperature-range polyetheretherketone-based self-lubricating composite material part for LPBF, characterized in that: include: Polyetheretherketone powder and molybdenum disulfide powder are pretreated and then mixed evenly to obtain a wide-temperature-range polyetheretherketone-based self-lubricating composite material powder; Based on the part model, the wide-temperature-range polyetheretherketone-based self-lubricating composite material powder is used as raw material, and laser powder bed melting technology is adopted for printing and molding, and a wide-temperature-range polyetheretherketone-based self-lubricating composite material part is obtained after cooling.

2. The method for forming a wide-temperature-range polyetheretherketone-based self-lubricating composite material part for LPBF according to claim 1, characterized in that: In the wide-temperature-range polyetheretherketone-based self-lubricating composite material powder, the polyetheretherketone powder accounts for 85-95 wt % and the molybdenum disulfide powder accounts for 5-15 wt %.

3. The method for forming a wide-temperature-range polyetheretherketone-based self-lubricating composite material part for LPBF according to claim 1, characterized in that: The pretreatment includes: Take polyetheretherketone powder and carry out high-temperature powder spreading process layer by layer in LPBF equipment, with the powder layer thickness of 0.1mm, the powder spreading speed of 50~100mm / s, and the format temperature of 300~310℃; Take molybdenum disulfide powder and dry it at 150~200℃ for 6~8h.

4. The method for forming a wide-temperature-range polyetheretherketone-based self-lubricating composite material part for LPBF according to claim 1 or 3, characterized in that: The pretreated polyetheretherketone powder is mechanically mixed with molybdenum disulfide powder at a mechanical mixing speed of 200-300 r / min for 2-3 hours.

5. The method for forming a wide-temperature-range polyetheretherketone-based self-lubricating composite material part for LPBF according to claim 1 or 3, characterized in that: The particle size of the polyetheretherketone powder is 50-100 μm, and the particle size of the molybdenum disulfide powder is 1-10 μm.

6. The method for forming a wide-temperature-range polyetheretherketone-based self-lubricating composite material for LPBF according to claim 1, characterized in that: During the laser powder bed fusion printing process, the powder supply cylinder surface temperature is maintained at 240-280°C, the forming cylinder preheating temperature is 320-330°C, and the pre-laid powder bed thickness is 4-6 mm.

7. The method for forming a wide-temperature-range polyetheretherketone-based self-lubricating composite material for LPBF according to claim 1, characterized in that: The process parameters for printing using laser powder bed fusion technology are: laser power of 15-18 W, scanning speed of 2500-3000 mm / s, layer thickness of 0.1 mm, and scanning spacing of 0.1 mm.

8. The method for forming a wide-temperature-range polyetheretherketone-based self-lubricating composite material part for LPBF according to claim 1, characterized in that: During the printing process using the laser powder bed fusion technology, the laser scanning adopts a multi-directional cross scanning strategy, that is, each layer is scanned twice, the intra-layer scanning angle is 60~90°, and the inter-layer scanning path angle is 30~60°.

9. The method for forming a wide-temperature-range polyetheretherketone-based self-lubricating composite material part for LPBF according to claim 1, characterized in that: After the printing and molding using the laser powder bed fusion technology is completed, the workpiece is subjected to a gradient heat treatment in the cylinder, and the powder is continuously spread to bury the workpiece in the powder for 5~10mm, and the width temperature is kept at 300~320℃ for 1~2h, and then the temperature is gradually reduced at a rate of 10℃ / min, and the temperature is kept for 0.5h every time the temperature drops by 30~50℃, until it is taken out after it cools to room temperature.

10. A wide-temperature-range polyetheretherketone-based self-lubricating composite material part for LPBF produced by the forming method according to any one of claims 1 to 9.

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