Spliced self-lubricating polyether ether ketone three-layer composite board and preparation method thereof

Abstract

The application discloses spliced self-lubricating polyether ether ketone three-layer composite plate and a preparation method thereof. The spliced self-lubricating polyether ether ketone three-layer composite plate comprises, from bottom to top, a metal base layer, a copper powder layer and a spliced self-lubricating layer connected in sequence. The spliced self-lubricating layer is composed of a plurality of wear-resistant PEEK pieces with good wear resistance and friction-reducing PEEK pieces with good friction-reducing performance arranged alternately. The friction-reducing PEEK pieces are designed to be arranged at an angle of 30-60 degrees with the horizontal direction, i.e. the friction-reducing PEEK pieces are arranged in an inclined strip shape between the wear-resistant PEEK pieces with good wear resistance. The structure design can form a complete self-lubricating friction-reducing layer during reciprocating movement of the composite plate, reduces the friction coefficient of the plate and a friction pair, and finally improves the wear resistance of the material.

Description

Technical Field

[0001] This invention belongs to the field of self-lubricating three-layer composite boards, specifically relating to a spliced ​​self-lubricating polyether ether ketone three-layer composite board and its preparation method. Background Technology

[0002] Polyetheretherketone (PEEK) is a high-temperature resistant, acid and alkali resistant, and high-strength specialty engineering plastic commonly used in electronics, medical, automotive, and machinery manufacturing industries. However, its application is limited by its relatively high coefficient of friction, poor wear resistance, and difficulty in dissipating frictional heat when used in mechanical equipment such as gears and bearings. To ensure stable performance during long-term use, PEEK is often doped with self-lubricating additives such as polytetrafluoroethylene (PTFE), graphite, and molybdenum disulfide (MoS2), as well as rigid inorganic particles such as titanium dioxide, silica, and copper powder. The introduction of these additives reduces the coefficient of friction and wear to some extent. However, with the increase of self-lubricating additives like PTFE, graphite, and MoS2, the coefficient of friction decreases continuously, while wear initially decreases and then increases. Generally, the amount of self-lubricating additives should not be too high to ensure wear resistance. However, with increasingly demanding operating conditions, the existing materials' wear resistance is no longer sufficient. Summary of the Invention

[0003] To address the problems existing in the prior art, the purpose of this invention is to provide a spliced ​​self-lubricating polyether ether ketone three-layer composite board and its preparation method. This composite board has good wear resistance in addition to good friction performance.

[0004] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0005] A three-layer composite board with spliced ​​self-lubricating polyetheretherketone (PEEK) material comprises, from bottom to top, a metal substrate layer, a copper powder layer, and a spliced ​​self-lubricating layer connected in sequence. The spliced ​​self-lubricating layer is composed of several wear-resistant PEEK sheets with good wear resistance and friction-reducing PEEK sheets with good friction-reducing properties arranged alternately. The area of ​​the friction-reducing PEEK sheets with good friction-reducing properties accounts for 10% to 25% of the total sliding area of ​​the spliced ​​self-lubricating layer. The angle between the friction-reducing PEEK sheets and the horizontal direction is 30° to 60°, that is, the friction-reducing PEEK sheets are evenly distributed in inclined strips among the wear-resistant PEEK sheets with good wear resistance. The width of the strips is between 3mm and 8mm, and the length ratio of the friction-reducing PEEK sheets at various positions in the width direction of the board fluctuates within ±3%.

[0006] In a further embodiment, the metal substrate layer is made of carbon steel with a carbon content of <0.25%; the thickness of the metal substrate layer is 1.0mm to 4.0mm; the copper powder layer is made of tin bronze with a thickness of 0.1mm to 0.4mm and a copper powder particle size of 60 mesh to 140 mesh; and the thickness of the spliced ​​self-lubricating layer is 0.1mm to 0.3mm.

[0007] The wear-resistant PEEK sheet with good wear resistance serves as the matrix, mainly playing a load-bearing role; the friction-reducing PEEK sheet with good friction-reducing properties acts as a friction reducer, mainly playing a friction-reducing role. During continuous reciprocating motion, the friction-reducing PEEK sheet spreads on the surface of the self-lubricating layer, reducing the coefficient of friction between the plate and the friction component, and preventing the wear-resistant PEEK sheet with good wear resistance from contacting the friction component, ultimately achieving the purpose of improving wear resistance. The area of ​​the friction-reducing PEEK sheet with good friction-reducing properties should not be less than 10% of the friction surface area. If the proportion is too small, a complete self-lubricating friction-reducing layer cannot be formed on the entire contact surface, resulting in poor friction-reducing effect. The surface area of ​​the friction-reducing PEEK sheet with good friction-reducing properties should not exceed 25%. If the proportion of the friction-reducing PEEK sheet with good friction-reducing properties is too large, because the wear resistance of the friction-reducing PEEK sheet is poor, after wear, the entire load will be distributed on the wear-resistant PEEK sheet with good wear resistance, resulting in an increase in the specific pressure on its surface of more than 33%. Due to the increase in specific pressure, the material wears more and the wear resistance decreases. PEEK sheets with good friction-reducing properties are elongated strips, forming an angle of 30° to 60° with the long side of the composite board. When the angle is less than 30°, during continuous reciprocating motion of a certain stroke, the friction-reducing material cannot form a complete self-lubricating friction-reducing layer in some locations along the reciprocating direction, resulting in poor friction-reducing effect. When the angle is greater than 60°, the surface area of ​​the PEEK sheet with good friction-reducing performance is too large in some locations, while in others it is too small or even non-existent, resulting in multiple areas with different friction-reducing and wear-resistant effects on a single board, rendering it unusable. The strip width is between 3mm and 8mm. When the strip width is less than 3mm, the strip is too narrow, making it difficult to manufacture, prone to warping, and difficult to place. When the strip width is greater than 8mm, due to the small proportion of the strip and its relatively uneven distribution, it is difficult to form a complete self-lubricating layer on the reciprocating sliding surface, resulting in poor friction-reducing effect. The height of the strip is the same as the width of the board to ensure that a self-lubricating friction-reducing layer is formed throughout the entire width direction.

[0008] The above-mentioned friction-reducing PEEK sheets are prepared from the following raw materials in the following weight percentages:

[0009] 10%–20% polytetrafluoroethylene (1μm–9μm)

[0010] 0.5%–3% layered zirconium phosphate (0.5μm–3μm)

[0011] Other polyetheretherketones (18μm~23μm)

[0012] Adding 10%–20% polytetrafluoroethylene (PTFE) to PEEK sheets with good friction-reducing properties is crucial. To achieve optimal friction-reducing performance, the amount of PTFE cannot be too small, as this would negate its friction-reducing effect; conversely, too much PTFE would result in poor wear resistance. PTFE particle size is 1μm–9μm, more than twice the particle size of polyetheretherketone (PEEK). Since PTFE is a non-stick material and has an interface with PEEK, smaller PTFE particles than PEEK are needed to ensure uniform dispersion of PTFE within the PEEK material and prevent it from fusing together after plasticization. To further improve wear resistance, adding 0.5%–3% layered zirconium phosphate to PEEK sheets with good friction-reducing properties is also beneficial. Zirconium phosphate particles are even smaller than PTFE particles, allowing for uniform distribution within both PTFE and PEEK materials, thus simultaneously improving the wear resistance of both materials.

[0013] The above-mentioned wear-resistant PEEK sheets are prepared from the following raw materials in the following weight percentages:

[0014] 2%–4% polytetrafluoroethylene (1μm–9μm)

[0015] 20-25% carbon fiber (48μm-75μm)

[0016] Other polyetheretherketones (18μm~23μm)

[0017] Adding a small amount of polytetrafluoroethylene (PTFE) to PEEK sheets with good wear resistance reduces the coefficient of friction of polyetheretherketone (PEEK) without significantly reducing its wear resistance. Adding 20%–25% carbon fiber to PEEK sheets with good wear resistance is also beneficial. Too little carbon fiber results in only a slight increase in wear resistance, while too much leads to poor formability, surface roughness, and a sharp decrease in wear resistance. The length of the carbon fiber should be 48μm–75μm. Too short a length makes it easy to be ground into abrasive particles, resulting in poor wear resistance. Currently, the diameter of a single carbon fiber filament is 7μm; too long a length and aspect ratio make the carbon fiber prone to breakage during mixing, making it difficult to control.

[0018] This invention also provides a method for preparing the above-described spliced ​​self-lubricating polyether ether ketone three-layer composite board, comprising the following steps:

[0019] (1) Ingredients: Weigh out polytetrafluoroethylene, layered zirconium phosphate, carbon fiber and polyether ether ketone as raw materials according to the proportions.

[0020] (2) Powder mixing: Polytetrafluoroethylene, layered zirconium phosphate and polyether ether ketone are mixed evenly to obtain friction-reducing PEEK mixed powder; Polytetrafluoroethylene, carbon fiber and polyether ether ketone are mixed evenly to obtain wear-resistant PEEK mixed powder;

[0021] (3) Extrusion molding: The friction-reducing PEEK mixed powder and the wear-resistant PEEK mixed powder are poured into the extruder and extruded to obtain friction-reducing PEEK sheets and wear-resistant PEEK sheets with a thickness of 0.2 mm to 0.5 mm; the width of the friction-reducing PEEK sheet is 3 mm to 8 mm, and the width of the wear-resistant PEEK sheet is 6 mm to 12 mm smaller than the width of the prepared spherical powder plate;

[0022] (4) Sheet cutting: Cut the sheets (friction-reducing PEEK sheets and wear-resistant PEEK sheets) according to the layout design requirements;

[0023] (5) According to the layout design, the friction-reducing PEEK sheets and wear-resistant PEEK sheets are alternately arranged on the ball powder plate. The length of the ball powder plate is between 300mm and 500mm. A gap of 2mm to 5mm is left between adjacent friction-reducing PEEK sheets and wear-resistant PEEK sheets.

[0024] (6) Plasticizing: Place the ball powder board with the sheet material laid on the pad, and put the ball powder board together with the pad into the mesh belt plasticizing furnace under protective gas for plasticizing. The inlet end of the ball powder board is 200mm to 400mm away from the edge of the pad. The protective gas is nitrogen with a purity of more than 99.9%. The plasticizing temperature is 380 to 400℃ and the plasticizing time is 20 to 40 minutes.

[0025] (7) Hot rolling: When the pad is exposed at the exit end, the pad is quickly taken out from the mesh belt plasticizing furnace, the plasticized sheet is quickly picked up from the pad and immediately put into the hot rolling mill for rolling. The temperature of the hot rolling mill rolls is between 160℃ and 200℃.

[0026] In polyetheretherketone (PEEK) three-layer composite sheets, the thickness of the self-lubricating layer is generally between 0.1mm and 0.3mm. When the sheet is laminated with the ball-powder board, the self-lubricating layer is thinned by rolling. To ensure the thickness of the self-lubricating layer in the PEEK three-layer composite material, the PEEK sheet used should be slightly thicker, but not too thick. Otherwise, the excessive rolling amount will cause severe deformation and lead to uncontrolled material distribution. Therefore, the sheet thickness is controlled between 0.2mm and 0.5mm. When the sheet is rolled and laminated with the ball-powder board, most of the material will be rolled to the end of the sheet, but there will also be some overflow on both sides. However, the amount of material overflowing on both sides is relatively small and difficult to remove. To avoid the overflow of material on both sides and the resulting processing work, the width of the wear-resistant PEEK sheet needs to be 6mm to 12mm smaller than the width of the ball-powder board. To ensure that the friction-reducing PEEK sheet and the wear-resistant PEEK sheet do not overlap each other during hot rolling and retain the design structure, a gap of 2mm to 5mm is left between adjacent friction-reducing PEEK sheets and wear-resistant PEEK sheets when laying the sheets. Polyetheretherketone (PEEK) has a high heat distortion temperature. To ensure material dimensional consistency, the length of the ball powder plate in this method should not exceed 500mm. Otherwise, the material will cool down at the tail end, resulting in a smaller rolling amount and a larger difference in the plate wall thickness. The length of the ball powder plate should not be too short, otherwise it will affect production efficiency. Therefore, the length of the ball powder plate should not be less than 300mm. To ensure that the material at the furnace mouth does not cool down, the ball powder plate needs to be placed on a pad, with the inlet end of the ball powder plate 200mm to 400mm from the edge of the pad.

[0027] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0028] The self-lubricating polyether ether ketone (PEEK) three-layer composite board provided by this invention consists of several wear-resistant PEEK sheets with good wear resistance and friction-reducing PEEK sheets with good friction-reducing properties arranged alternately. The friction-reducing PEEK sheets are designed to be positioned at an angle of 30° to 60° with the horizontal direction, that is, the friction-reducing PEEK sheets are evenly distributed in an inclined strip shape between the wear-resistant PEEK sheets with good wear resistance. This structural design can form a complete self-lubricating friction-reducing layer during the reciprocating motion of the composite board, reduce the friction coefficient between the board and the friction components, and ultimately improve the wear resistance of the material. Attached Figure Description

[0029] Figure 1 A top view of the spliced ​​self-lubricating layer of the product prepared in Example 1;

[0030] Figure 2 A top view of the spliced ​​self-lubricating layer of the product prepared in Example 2;

[0031] Figure reference numerals: 1-Abrasion-resistant PEEK sheet, 2-Friction-reducing PEEK sheet. Detailed Implementation

[0032] The present invention will be further described below with reference to embodiments, so that those skilled in the art can better understand and implement the present invention, but the embodiments are not intended to limit the present invention.

[0033] In addition, unless otherwise specified, the preparation processes in the following embodiments are all conventional methods in the prior art, and therefore will not be described in detail; the raw materials used in the following embodiments are all commercially available products.

[0034] A spliced ​​self-lubricating polyetheretherketone (PEEK) three-layer composite board includes a metal substrate layer, a copper powder layer, and a spliced ​​self-lubricating layer; (Reference) Figures 1 to 2 The spliced ​​self-lubricating layer consists of several wear-resistant PEEK sheets 1 with good wear resistance and friction-reducing PEEK sheets 2 arranged alternately. The friction-reducing PEEK sheets account for 10% to 25% of the total reciprocating sliding area. They are evenly distributed among the wear-resistant PEEK sheets in the form of long strips with an inclination angle of 30° to 60°. The width of the strips is between 3mm and 8mm. The proportion of the length of the friction-reducing PEEK sheets with good friction reduction at various positions in the width direction of the plate fluctuates within ±3%. The height of the strips is equal to the width of the plate.

[0035] The composition of the above-mentioned friction-reducing PEEK sheets with good friction-reducing properties is as follows (by weight percentage):

[0036] 10%–20% polytetrafluoroethylene (1μm–9μm)

[0037] 0.5%–3% layered zirconium phosphate (0.5μm–3μm)

[0038] Other polyetheretherketones (18μm~23μm)

[0039] The above-mentioned wear-resistant PEEK sheets with good wear resistance are composed of the following (by weight percentage):

[0040] 2%–4% polytetrafluoroethylene (1μm–9μm)

[0041] 20-25% carbon fiber (48μm-75μm)

[0042] Other polyetheretherketones (18μm~23μm)

[0043] The manufacturing method of the above-mentioned spliced ​​self-lubricating polyetheretherketone three-layer composite board is as follows:

[0044] (1) Ingredients: Weigh out polytetrafluoroethylene, layered zirconium phosphate, carbon fiber and polyether ether ketone as raw materials according to the proportions.

[0045] (2) Powder mixing: Polytetrafluoroethylene, layered zirconium phosphate and polyether ether ketone are mixed evenly to obtain friction-reducing PEEK mixed powder; Polytetrafluoroethylene, carbon fiber and polyether ether ketone are mixed evenly to obtain wear-resistant PEEK mixed powder;

[0046] (3) Extrusion molding: The friction-reducing PEEK mixed powder and the wear-resistant PEEK mixed powder are poured into the extruder and extruded to obtain friction-reducing PEEK sheets and wear-resistant PEEK sheets with a thickness of 0.2 mm to 0.5 mm. The width of the friction-reducing PEEK sheet with better friction-reducing performance is 3 mm to 8 mm, and the width of the wear-resistant PEEK sheet with better wear-resistant performance is 6 mm to 12 mm smaller than that of the prepared three-layer composite board.

[0047] (4) Sheet cutting: Cut the sheet according to the layout design requirements;

[0048] (5) Sheet arrangement: According to the arrangement design, the friction-reducing PEEK sheets and wear-resistant PEEK sheets are alternately arranged on the ball powder plate. The length of the ball powder plate is between 300mm and 500mm. When placing them, leave a gap of 2mm to 5mm between adjacent friction-reducing PEEK sheets and wear-resistant PEEK sheets.

[0049] (6) Plasticizing: Place the ball powder board with the sheet material laid on the pad, and put the ball powder board together with the pad into the mesh belt plasticizing furnace under protective gas for plasticizing. The inlet end of the ball powder board is 200mm to 400mm away from the edge of the pad. The protective gas is nitrogen with a purity of more than 99.9%. The plasticizing temperature is 380 to 400℃ and the plasticizing time is 20 to 40 minutes.

[0050] (7) Hot rolling: When the pad is exposed at the exit end, the pad is quickly taken out of the mesh belt plasticizing furnace, the plasticized sheet is quickly picked up from the pad and immediately put into the hot rolling mill for rolling. The temperature of the hot rolling mill rolls is between 160℃ and 200℃.

[0051] Example 1

[0052] A spliced ​​self-lubricating polyetheretherketone (PEEK) three-layer composite board includes a steel backing layer, a copper powder layer, and a spliced ​​self-lubricating layer; Reference Figure 1 The spliced ​​self-lubricating layer includes wear-resistant PEEK sheets with good wear resistance and friction-reducing PEEK sheets with good friction-reducing properties. The friction-reducing PEEK sheets account for 10% of the total reciprocating sliding area. They are evenly distributed among the wear-resistant PEEK sheets in the form of long strips with an inclination angle of 30°. The strip width is 3mm. The length ratio of the friction-reducing PEEK sheets with good friction-reducing properties at various positions in the width direction of the plate fluctuates within ±3%. The height of the strip is equal to the width of the plate.

[0053] The composition of the above-mentioned friction-reducing PEEK sheets with good friction-reducing properties is as follows (by weight percentage):

[0054] 10% polytetrafluoroethylene

[0055] 0.5% layered zirconium phosphate

[0056] The remaining polyetheretherketone

[0057] The above-mentioned wear-resistant PEEK sheets with good wear resistance are composed of the following (by weight percentage):

[0058] 2% polytetrafluoroethylene

[0059] 20% carbon fiber

[0060] The remaining polyetheretherketone

[0061] The manufacturing method of the above-mentioned spliced ​​self-lubricating polyetheretherketone three-layer composite board is as follows:

[0062] (1) Ingredients: Weigh out polytetrafluoroethylene, layered zirconium phosphate, carbon fiber and polyether ether ketone as raw materials according to the proportions.

[0063] (2) Powder mixing: Polytetrafluoroethylene, layered zirconium phosphate and polyether ether ketone are mixed evenly to obtain friction-reducing PEEK mixed powder; Polytetrafluoroethylene, carbon fiber and polyether ether ketone are mixed evenly to obtain wear-resistant PEEK mixed powder;

[0064] (3) Extrusion molding: The friction-reducing PEEK mixed powder and the wear-resistant PEEK mixed powder are poured into the extruder respectively, and friction-reducing PEEK sheets and wear-resistant PEEK sheets with a thickness of 0.3mm are extruded. The width of the friction-reducing PEEK sheet is 3mm, and the width of the wear-resistant PEEK sheet is 6mm smaller than that of the prepared three-layer composite board.

[0065] (4) Sheet cutting: Cut the sheet according to the layout design requirements;

[0066] (5) Sheet arrangement: According to the arrangement design, the friction-reducing PEEK sheets and wear-resistant PEEK sheets are alternately arranged on the ball powder plate, leaving a 2mm gap between adjacent sheets. The ball powder plate consists of a metal substrate layer and a porous copper powder layer. The length of the ball powder plate is 500mm. The metal substrate layer is copper-plated SPCC low carbon steel with a thickness of 2.5mm. The porous copper powder layer is 80-100 mesh bronze ball powder QFQSn8-3 with a thickness of 0.3mm.

[0067] (6) Plasticizing: Place the ball powder board with the sheet material laid on the pad, and put the ball powder board together with the pad into the mesh belt plasticizing furnace under protective gas protection for plasticizing. The inlet end of the ball powder board is 200mm away from the edge of the pad. The protective gas is nitrogen with a purity of more than 99.9%. The plasticizing temperature is 380℃ and the plasticizing time is 40 minutes.

[0068] (7) Hot rolling: When the pad is exposed at the exit end, the pad is quickly taken out from the mesh belt plasticizing furnace, the plasticized sheet is quickly picked up from the pad and immediately put into the hot rolling mill for rolling. The temperature of the hot rolling mill rolls is 160℃.

[0069] Example 2

[0070] A spliced ​​self-lubricating polyetheretherketone (PEEK) three-layer composite board includes a steel backing layer, a copper powder layer, and a spliced ​​self-lubricating layer; Reference Figure 2 The spliced ​​self-lubricating layer includes wear-resistant PEEK sheets with good wear resistance and friction-reducing PEEK sheets with good friction-reducing properties. The friction-reducing PEEK sheets account for 25% of the total reciprocating sliding area. They are evenly distributed among the wear-resistant PEEK sheets in the form of long strips with an inclination angle of 60°. The strip width is 8mm. The length ratio of the friction-reducing PEEK sheets with good friction-reducing properties at various positions in the width direction of the plate fluctuates within ±3%. The height of the strip is equal to the width of the plate.

[0071] The composition of the above-mentioned friction-reducing PEEK sheets with good friction-reducing properties is as follows (by weight percentage):

[0072] 10% polytetrafluoroethylene

[0073] 0.5% layered zirconium phosphate

[0074] The remaining polyetheretherketone

[0075] The above-mentioned wear-resistant PEEK sheets with good wear resistance are composed of the following (by weight percentage):

[0076] 2% polytetrafluoroethylene

[0077] 20% carbon fiber

[0078] The remaining polyetheretherketone

[0079] The manufacturing method of the above-mentioned spliced ​​self-lubricating polyetheretherketone three-layer composite board is as follows:

[0080] (1) Ingredients: Weigh out polytetrafluoroethylene, layered zirconium phosphate, carbon fiber and polyether ether ketone as raw materials according to the proportions.

[0081] (2) Powder mixing: Polytetrafluoroethylene, layered zirconium phosphate and polyether ether ketone are mixed evenly to obtain friction-reducing PEEK mixed powder; Polytetrafluoroethylene, carbon fiber and polyether ether ketone are mixed evenly to obtain wear-resistant PEEK mixed powder;

[0082] (3) Extrusion molding: The friction-reducing PEEK mixed powder and the wear-resistant PEEK mixed powder are poured into the extruder respectively, and friction-reducing PEEK sheets and wear-resistant PEEK sheets with a thickness of 0.3mm are extruded. The friction-reducing PEEK sheet with better friction-reducing performance has a sheet width of 3mm, and the wear-resistant PEEK sheet with better wear-resistant performance has a sheet width that is 6mm smaller than the prepared three-layer composite board.

[0083] (4) Sheet cutting: Cut the sheet according to the layout design requirements;

[0084] (5) Sheet arrangement: According to the arrangement design, the friction-reducing PEEK sheets and wear-resistant PEEK sheets are alternately arranged on the ball powder plate, leaving a 2mm gap between adjacent sheets. The ball powder plate consists of a metal substrate layer and a porous copper powder layer. The length of the ball powder plate is 500mm. The metal substrate layer is copper-plated SPCC low carbon steel with a thickness of 2.5mm. The porous copper powder layer is 80-100 mesh bronze ball powder QFQSn8-3 with a thickness of 0.3mm.

[0085] (6) Plasticizing: Place the ball powder board with the sheet material laid on the pad, and put the ball powder board together with the pad into the mesh belt plasticizing furnace under protective gas for plasticizing. The inlet end of the ball powder board is 200mm away from the edge of the pad. The protective gas is nitrogen with a purity of more than 99.9%. The plasticizing temperature is 380℃ and the plasticizing time is 40 minutes.

[0086] (7) Hot rolling: When the pad is exposed at the exit end, the pad is quickly taken out from the mesh belt plasticizing furnace, the plasticized sheet is quickly picked up from the pad and immediately put into the hot rolling mill for rolling. The temperature of the hot rolling mill rolls is 160℃.

[0087] Example 3

[0088] A spliced ​​self-lubricating polyetheretherketone (PEEK) three-layer composite board includes a steel backing layer, a copper powder layer, and a spliced ​​self-lubricating layer. The spliced ​​self-lubricating layer includes wear-resistant PEEK sheets with good wear resistance and friction-reducing PEEK sheets with good friction-reducing properties. The friction-reducing PEEK sheets account for 18% of the total reciprocating sliding area and are evenly distributed in the form of long strips with an inclination angle of 45° between the wear-resistant PEEK sheets. The strips are 5.5 mm wide, and the length ratio of the friction-reducing PEEK sheets at various positions along the width of the board fluctuates within ±3%. The height of the strips is equal to the width of the board.

[0089] The composition of the above-mentioned friction-reducing PEEK sheets with good friction-reducing properties is as follows (by weight percentage):

[0090] 10% polytetrafluoroethylene

[0091] 0.5% layered zirconium phosphate

[0092] The remaining polyetheretherketone

[0093] The above-mentioned wear-resistant PEEK sheets with good wear resistance are composed of the following (by weight percentage):

[0094] 2% polytetrafluoroethylene

[0095] 20% carbon fiber

[0096] The remaining polyetheretherketone

[0097] The manufacturing method of the above-mentioned spliced ​​self-lubricating polyetheretherketone three-layer composite board is as follows:

[0098] (1) Ingredients: Weigh out polytetrafluoroethylene, layered zirconium phosphate, carbon fiber and polyether ether ketone as raw materials according to the proportions.

[0099] (2) Powder mixing: Polytetrafluoroethylene, layered zirconium phosphate and polyether ether ketone are mixed evenly to obtain friction-reducing PEEK mixed powder; Polytetrafluoroethylene, carbon fiber and polyether ether ketone are mixed evenly to obtain wear-resistant PEEK mixed powder;

[0100] (3) Extrusion molding: The friction-reducing PEEK mixed powder and the wear-resistant PEEK mixed powder are poured into the extruder respectively, and friction-reducing PEEK sheets and wear-resistant PEEK sheets with a thickness of 0.3mm are extruded. The friction-reducing PEEK sheet with better friction-reducing performance has a sheet width of 3mm, and the wear-resistant PEEK sheet with better wear-resistant performance has a sheet width that is 6mm smaller than the prepared three-layer composite board.

[0101] (4) Sheet cutting: Cut the sheet according to the layout design requirements;

[0102] (5) Sheet arrangement: According to the arrangement design, the friction-reducing PEEK sheets and wear-resistant PEEK sheets are alternately arranged on the ball powder plate, leaving a 2mm gap between adjacent sheets. The ball powder plate consists of a metal substrate layer and a porous copper powder layer. The length of the ball powder plate is 500mm. The metal substrate layer is copper-plated SPCC low carbon steel with a thickness of 2.5mm. The porous copper powder layer is 80-100 mesh bronze ball powder QFQSn8-3 with a thickness of 0.3mm.

[0103] (6) Plasticizing: Place the ball powder board with the sheet material laid on the pad, and put the ball powder board together with the pad into the mesh belt plasticizing furnace under protective gas for plasticizing. The inlet end of the ball powder board is 200mm away from the edge of the pad. The protective gas is nitrogen with a purity of more than 99.9%. The plasticizing temperature is 380℃ and the plasticizing time is 40 minutes.

[0104] (7) Hot rolling: When the pad is exposed at the exit end, the pad is quickly taken out from the mesh belt plasticizing furnace, the plasticized sheet is quickly picked up from the pad and immediately put into the hot rolling mill for rolling. The temperature of the hot rolling mill rolls is 160℃.

[0105] Example 4

[0106] A spliced ​​self-lubricating polyetheretherketone (PEEK) three-layer composite board includes a steel backing layer, a copper powder layer, and a spliced ​​self-lubricating layer. The spliced ​​self-lubricating layer includes wear-resistant PEEK sheets with good wear resistance and friction-reducing PEEK sheets with good friction-reducing properties. The friction-reducing PEEK sheets account for 10% of the total reciprocating sliding area and are evenly distributed in the form of long strips with an inclination angle of 30° between the wear-resistant PEEK sheets. The strips are 3mm wide, and the length ratio of the friction-reducing PEEK sheets at various positions along the width of the board fluctuates within ±3%. The height of the strips is equal to the width of the board.

[0107] The composition of the above-mentioned friction-reducing PEEK sheets with good friction-reducing properties is as follows (by weight percentage):

[0108] 15% polytetrafluoroethylene

[0109] 1% layered zirconium phosphate

[0110] The remaining polyetheretherketone

[0111] The above-mentioned wear-resistant PEEK sheets with good wear resistance are composed of the following (by weight percentage):

[0112] 3% polytetrafluoroethylene

[0113] 22% carbon fiber

[0114] The remaining polyetheretherketone

[0115] The manufacturing method of the above-mentioned spliced ​​self-lubricating polyetheretherketone three-layer composite board is as follows:

[0116] (1) Ingredients: Weigh out polytetrafluoroethylene, layered zirconium phosphate, carbon fiber and polyether ether ketone as raw materials according to the proportions.

[0117] (2) Powder mixing: Polytetrafluoroethylene, layered zirconium phosphate and polyether ether ketone are mixed evenly to obtain friction-reducing PEEK mixed powder; Polytetrafluoroethylene, carbon fiber and polyether ether ketone are mixed evenly to obtain wear-resistant PEEK mixed powder;

[0118] (3) Extrusion molding: The friction-reducing PEEK mixed powder and the wear-resistant PEEK mixed powder are poured into the extruder respectively, and friction-reducing PEEK sheets and wear-resistant PEEK sheets with a thickness of 0.3mm are extruded. The friction-reducing PEEK sheet with better friction-reducing performance has a sheet width of 3mm, and the wear-resistant PEEK sheet with better wear-resistant performance has a sheet width that is 6mm smaller than the prepared three-layer composite board.

[0119] (4) Sheet cutting: Cut the sheet according to the layout design requirements;

[0120] (5) Sheet arrangement: According to the arrangement design, the friction-reducing PEEK sheets and wear-resistant PEEK sheets are alternately arranged on the ball powder plate, leaving a 2mm gap between adjacent sheets. The ball powder plate consists of a metal substrate layer and a porous copper powder layer. The length of the ball powder plate is 500mm. The metal substrate layer is copper-plated SPCC low carbon steel with a thickness of 2.5mm. The porous copper powder layer is 80-100 mesh bronze ball powder QFQSn8-3 with a thickness of 0.3mm.

[0121] (6) Plasticizing: Place the ball powder board with the sheet material laid on the pad, and put the ball powder board together with the pad into the mesh belt plasticizing furnace under protective gas for plasticizing. The inlet end of the ball powder board is 200mm away from the edge of the pad. The protective gas is nitrogen with a purity of more than 99.9%. The plasticizing temperature is 380℃ and the plasticizing time is 40 minutes.

[0122] (7) Hot rolling: When the pad is exposed at the exit end, the pad is quickly taken out from the mesh belt plasticizing furnace, the plasticized sheet is quickly picked up from the pad and immediately put into the hot rolling mill for rolling. The temperature of the hot rolling mill rolls is 160℃.

[0123] Example 5

[0124] A spliced ​​self-lubricating polyetheretherketone (PEEK) three-layer composite board includes a steel backing layer, a copper powder layer, and a spliced ​​self-lubricating layer. The spliced ​​self-lubricating layer includes wear-resistant PEEK sheets with good wear resistance and friction-reducing PEEK sheets with good friction-reducing properties. The friction-reducing PEEK sheets account for 10% of the total reciprocating sliding area and are evenly distributed in the form of long strips with an inclination angle of 30° between the wear-resistant PEEK sheets. The strips are 3mm wide, and the length ratio of the friction-reducing PEEK sheets at various positions along the width of the board fluctuates within ±3%. The height of the strips is equal to the width of the board.

[0125] The composition of the above-mentioned friction-reducing PEEK sheets with good friction-reducing properties is as follows (by weight percentage):

[0126] 18% polytetrafluoroethylene

[0127] 2% layered zirconium phosphate

[0128] The remaining polyetheretherketone

[0129] The above-mentioned wear-resistant PEEK sheets with good wear resistance are composed of the following (by weight percentage):

[0130] 4% polytetrafluoroethylene

[0131] 25% carbon fiber

[0132] The remaining polyetheretherketone

[0133] The manufacturing method of the above-mentioned spliced ​​self-lubricating polyetheretherketone three-layer composite board is as follows:

[0134] (1) Ingredients: Weigh out polytetrafluoroethylene, layered zirconium phosphate, carbon fiber and polyether ether ketone as raw materials according to the proportions.

[0135] (2) Powder mixing: Polytetrafluoroethylene, layered zirconium phosphate and polyether ether ketone are mixed evenly to obtain friction-reducing PEEK mixed powder; Polytetrafluoroethylene, carbon fiber and polyether ether ketone are mixed evenly to obtain wear-resistant PEEK mixed powder;

[0136] (3) Extrusion molding: The friction-reducing PEEK mixed powder and the wear-resistant PEEK mixed powder are poured into the extruder respectively, and friction-reducing PEEK sheets and wear-resistant PEEK sheets with a thickness of 0.3mm are extruded. The friction-reducing PEEK sheet with better friction-reducing performance has a sheet width of 3mm, and the wear-resistant PEEK sheet with better wear-resistant performance has a sheet width that is 6mm smaller than the prepared three-layer composite board.

[0137] (4) Sheet cutting: Cut the sheet according to the layout design requirements;

[0138] (5) Sheet arrangement: According to the arrangement design, the friction-reducing PEEK sheets and wear-resistant PEEK sheets are alternately arranged on the ball powder plate, leaving a 2mm gap between adjacent sheets. The ball powder plate consists of a metal substrate layer and a porous copper powder layer. The length of the ball powder plate is 500mm. The metal substrate layer is copper-plated SPCC low carbon steel with a thickness of 2.5mm. The porous copper powder layer is 80-100 mesh bronze ball powder QFQSn8-3 with a thickness of 0.3mm.

[0139] (6) Plasticizing: Place the ball powder board with the sheet material laid on the pad, and put the ball powder board together with the pad into the mesh belt plasticizing furnace under protective gas for plasticizing. The inlet end of the ball powder board is 200mm away from the edge of the pad. The protective gas is nitrogen with a purity of more than 99.9%. The plasticizing temperature is 380℃ and the plasticizing time is 40 minutes.

[0140] (7) Hot rolling: When the pad is exposed at the exit end, the pad is quickly taken out from the mesh belt plasticizing furnace, the plasticized sheet is quickly picked up from the pad and immediately put into the hot rolling mill for rolling. The temperature of the hot rolling mill rolls is 160℃.

[0141] Example 6

[0142] A spliced ​​self-lubricating polyetheretherketone (PEEK) three-layer composite board includes a steel backing layer, a copper powder layer, and a spliced ​​self-lubricating layer. The spliced ​​self-lubricating layer includes wear-resistant PEEK sheets with good wear resistance and friction-reducing PEEK sheets with good friction-reducing properties. The friction-reducing PEEK sheets account for 10% of the total reciprocating sliding area and are evenly distributed in the form of long strips with an inclination angle of 30° between the wear-resistant PEEK sheets. The strips are 3mm wide, and the length ratio of the friction-reducing PEEK sheets at various positions along the width of the board fluctuates within ±3%. The height of the strips is equal to the width of the board.

[0143] The composition of the above-mentioned friction-reducing PEEK sheets with good friction-reducing properties is as follows (by weight percentage):

[0144] 20% polytetrafluoroethylene

[0145] 3% layered zirconium phosphate

[0146] The remaining polyetheretherketone

[0147] The above-mentioned wear-resistant PEEK sheets with good wear resistance are composed of the following (by weight percentage):

[0148] 4% polytetrafluoroethylene

[0149] 25% carbon fiber

[0150] The remaining polyetheretherketone

[0151] The manufacturing method of the above-mentioned spliced ​​self-lubricating polyetheretherketone three-layer composite board is as follows:

[0152] (1) Ingredients: Weigh out polytetrafluoroethylene, layered zirconium phosphate, carbon fiber and polyether ether ketone as raw materials according to the proportions.

[0153] (2) Powder mixing: Polytetrafluoroethylene, layered zirconium phosphate and polyether ether ketone are mixed evenly to obtain friction-reducing PEEK mixed powder; Polytetrafluoroethylene, carbon fiber and polyether ether ketone are mixed evenly to obtain wear-resistant PEEK mixed powder;

[0154] (3) Extrusion molding: The friction-reducing PEEK mixed powder and the wear-resistant PEEK mixed powder are poured into the extruder respectively, and friction-reducing PEEK sheets and wear-resistant PEEK sheets with a thickness of 0.3mm are extruded. The friction-reducing PEEK sheet with better friction-reducing performance has a sheet width of 3mm, and the wear-resistant PEEK sheet with better wear-resistant performance has a sheet width that is 6mm smaller than the prepared three-layer composite board.

[0155] (4) Sheet cutting: Cut the sheet according to the layout design requirements;

[0156] (5) Sheet arrangement: According to the arrangement design, the friction-reducing PEEK sheets and wear-resistant PEEK sheets are alternately arranged on the ball powder plate, leaving a 2mm gap between adjacent sheets. The ball powder plate consists of a metal substrate layer and a porous copper powder layer. The length of the ball powder plate is 500mm. The metal substrate layer is copper-plated SPCC low carbon steel with a thickness of 2.5mm. The porous copper powder layer is 80-100 mesh bronze ball powder QFQSn8-3 with a thickness of 0.3mm.

[0157] (6) Plasticizing: Place the ball powder board with the sheet material laid on the pad, and put the ball powder board together with the pad into the mesh belt plasticizing furnace under protective gas for plasticizing. The inlet end of the ball powder board is 200mm away from the edge of the pad. The protective gas is nitrogen with a purity of more than 99.9%. The plasticizing temperature is 380℃ and the plasticizing time is 40 minutes.

[0158] (7) Hot rolling: When the pad is exposed at the exit end, the pad is quickly taken out from the mesh belt plasticizing furnace, the plasticized sheet is quickly picked up from the pad and immediately put into the hot rolling mill for rolling. The temperature of the hot rolling mill rolls is 160℃.

[0159] Comparative Example 1

[0160] A self-lubricating polyetheretherketone (PEEK) three-layer composite board includes a steel backing layer, a copper powder layer, and a self-lubricating layer. The self-lubricating layer has the following material composition (by weight percentage):

[0161] 10% polytetrafluoroethylene

[0162] 0.5% layered zirconium phosphate

[0163] The remaining polyetheretherketones;

[0164] The manufacturing method of the above-mentioned self-lubricating polyetheretherketone three-layer composite board is as follows:

[0165] (1) Ingredients: Weigh out polytetrafluoroethylene, layered zirconium phosphate and polyether ether ketone as raw materials according to the proportions;

[0166] (2) Mixing powder: Mix the above powders and stir them to make them into a uniform powder mixture;

[0167] (3) Extrusion molding: Pour the powder mixture into the extruder and extrude a sheet with a thickness of 0.3 mm;

[0168] (4) Sheet laying: The sheet is laid on a ball powder board with a length of 500mm. The ball powder board consists of a metal substrate layer and a porous copper powder layer. The length of the ball powder board is 500mm. The metal substrate layer is copper-plated SPCC low carbon steel with a thickness of 2.5mm. The porous copper powder layer is 80-100 mesh bronze ball powder QFQSn8-3 with a thickness of 0.3mm.

[0169] (5) Plasticizing: Place the ball powder board with the sheet material laid on the pad, and put the ball powder board together with the pad into the mesh belt plasticizing furnace under protective gas protection for plasticizing. The inlet end of the ball powder board is 200mm away from the edge of the pad. The protective gas is nitrogen with a purity of more than 99.9%. The plasticizing temperature is 380℃ and the plasticizing time is 40 minutes.

[0170] (6) Hot rolling: When the pad is exposed at the exit end, the pad is quickly taken out from the mesh belt plasticizing furnace, the plasticized sheet is quickly picked up from the pad and immediately put into the hot rolling mill for rolling. The temperature of the hot rolling mill rolls is 160℃.

[0171] Comparative Example 2

[0172] A self-lubricating polyetheretherketone (PEEK) three-layer composite board includes a steel backing layer, a copper powder layer, and a self-lubricating layer. The self-lubricating layer has the following material composition (by weight percentage):

[0173] 2% polytetrafluoroethylene

[0174] 20% carbon fiber

[0175] The remaining polyetheretherketones;

[0176] The manufacturing method of the above-mentioned self-lubricating polyetheretherketone three-layer composite board is as follows:

[0177] (1) Ingredients: Weigh out polytetrafluoroethylene, carbon fiber and polyetheretherketone as raw materials according to the proportions;

[0178] (2) Mixing powder: Mix the above powders and stir them to make them into a uniform powder mixture;

[0179] (3) Extrusion molding: Pour the powder mixture into the extruder and extrude a sheet with a thickness of 0.3 mm;

[0180] (4) Sheet laying: The sheet is laid on the ball powder board; the ball powder board consists of a metal substrate layer and a porous copper powder layer. The length of the ball powder board is 500mm. The metal substrate layer is copper-plated SPCC low carbon steel with a thickness of 2.5mm. The porous copper powder layer is 80-100 mesh bronze ball powder QFQSn8-3 with a thickness of 0.3mm.

[0181] (5) Plasticizing: Place the ball powder board with the sheet material laid on the pad, and put the ball powder board together with the pad into the mesh belt plasticizing furnace under protective gas protection for plasticizing. The inlet end of the ball powder board is 200mm away from the edge of the pad. The protective gas is nitrogen with a purity of more than 99.9%. The plasticizing temperature is 380℃ and the plasticizing time is 40 minutes.

[0182] (6) Hot rolling: When the pad is exposed at the exit end, the pad is quickly taken out from the mesh belt plasticizing furnace, the plasticized sheet is quickly picked up from the pad and immediately put into the hot rolling mill for rolling. The temperature of the hot rolling mill rolls is 160℃.

[0183] Comparative Example 3

[0184] A self-lubricating polyetheretherketone (PEEK) three-layer composite board includes a steel backing layer, a copper powder layer, and a self-lubricating layer. The self-lubricating layer has the following material composition (by weight percentage):

[0185] 10% polytetrafluoroethylene

[0186] The remaining polyetheretherketones;

[0187] The manufacturing method of the above-mentioned self-lubricating polyetheretherketone three-layer composite board is as follows:

[0188] (1) Ingredients: Weigh out polytetrafluoroethylene and polyetheretherketone as raw materials according to the proportions;

[0189] (2) Mixing powder: Mix the above powders and stir them to make them into a uniform powder mixture;

[0190] (3) Extrusion molding: Pour the powder mixture into the extruder and extrude a sheet with a thickness of 0.3 mm;

[0191] (4) Sheet laying: The sheet is laid on the ball powder board; the ball powder board consists of a metal substrate layer and a porous copper powder layer. The length of the ball powder board is 500mm. The metal substrate layer is copper-plated SPCC low carbon steel with a thickness of 2.5mm. The porous copper powder layer is 80-100 mesh bronze ball powder QFQSn8-3 with a thickness of 0.3mm.

[0192] (5) Plasticizing: Place the ball powder board with the sheet material laid on the pad, and put the ball powder board together with the pad into the mesh belt plasticizing furnace under protective gas protection for plasticizing. The inlet end of the ball powder board is 200mm away from the edge of the pad. The protective gas is nitrogen with a purity of more than 99.9%. The plasticizing temperature is 380℃ and the plasticizing time is 40 minutes.

[0193] (6) Hot rolling: When the pad is exposed at the exit end, the pad is quickly taken out from the mesh belt plasticizing furnace, the plasticized sheet is quickly picked up from the pad and immediately put into the hot rolling mill for rolling. The temperature of the hot rolling mill rolls is 160℃.

[0194] Comparative Example 4

[0195] A self-lubricating polyetheretherketone (PEEK) three-layer composite board includes a steel backing layer, a copper powder layer, and a self-lubricating layer. The self-lubricating layer has the following material composition (by weight percentage):

[0196] 10% polytetrafluoroethylene

[0197] 15% carbon fiber

[0198] The remaining polyetheretherketones;

[0199] The manufacturing method of the above-mentioned self-lubricating polyetheretherketone three-layer composite board is as follows:

[0200] (1) Ingredients: Weigh out polytetrafluoroethylene, carbon fiber and polyetheretherketone as raw materials according to the proportions;

[0201] (2) Mixing powder: Mix the above powders and stir them to make them into a uniform powder mixture;

[0202] (3) Extrusion molding: Pour the powder mixture into the extruder and extrude a sheet with a thickness of 0.3 mm.

[0203] (4) Sheet laying: The sheet is laid on the ball powder board; the ball powder board consists of a metal substrate layer and a porous copper powder layer. The length of the ball powder board is 500mm. The metal substrate layer is copper-plated SPCC low carbon steel with a thickness of 2.5mm. The porous copper powder layer is 80-100 mesh bronze ball powder QFQSn8-3 with a thickness of 0.3mm.

[0204] (5) Plasticizing: The ball powder board with the sheet material laid on it is placed into the mesh belt plasticizing furnace under inert gas protection. The ball powder board inlet end is 200mm away from the edge of the pad. The inert gas is nitrogen with a purity of more than 99.9%. The plasticizing temperature is 380℃ and the plasticizing time is 40 minutes.

[0205] (6) Hot rolling: When the pad is exposed at the exit end, the pad is quickly taken out from the mesh belt plasticizing furnace, the plasticized sheet is quickly picked up from the pad and immediately put into the hot rolling mill for rolling. The temperature of the hot rolling mill rolls is 160℃.

[0206] Comparative Example 5

[0207] Compared with Example 1, the only difference in Comparative Example 5 is that the tilt angle of the anti-friction PEEK sheet is 20°, and all other processes are the same as in Example 1.

[0208] Comparative Example 6

[0209] Compared with Example 1, the only difference in Comparative Example 6 is that the tilt angle of the anti-friction PEEK sheet is 70°, and all other processes are the same as in Example 1.

[0210] Comparative Example 7

[0211] Compared with Example 1, the only difference in Comparative Example 7 is that the area of ​​the friction-reducing PEEK sheet accounts for 8% of the total reciprocating sliding area; all other processes are the same as in Example 1.

[0212] Comparative Example 8

[0213] Compared with Example 1, the only difference in Comparative Example 8 is that the area of ​​the friction-reducing PEEK sheet accounts for 30% of the total reciprocating sliding area; all other processes are the same as in Example 1.

[0214] The tribological properties of the polyetheretherketone (PEEK) three-layer composite sheets prepared in each embodiment and comparative example were compared, and the results are shown in Table 1. The tribological properties were tested using a swing tester. The sample size was 58mm × 52mm × 55mm. The test conditions were: 180KN, swing speed 19.6° / s, swing angle ±45°, fit clearance 0.08mm, and test duration 100h. The friction reduction effect of the materials was compared by the magnitude of the friction coefficient, and the wear resistance effect was compared by measuring the wear of the bushing. (The average of the maximum friction coefficient in each swing cycle within 100h was taken as the friction coefficient of the bushing; the wall thickness before and after wear was measured at 1cm from the edge on both sides of the force points at 0°, 30°, and -30°, and the average of the sum of the wall thickness differences at the three points on both sides was taken as the wear of the bushing.)

[0215] Table 1

[0216] coefficient of friction Wear amount (mm) Example 1 0.075 0.123 Example 2 0.070 0.13 Example 3 0.071 0.128 Example 4 0.075 0.119 Example 5 0.071 0.115 Example 6 0.068 0.120 Comparative Example 1 0.041 0.283 Comparative Example 2 0.085 0.185 Comparative Example 3 0.053 0.346 Comparative Example 4 0.062 0.201 Comparative Example 5 0.083 0.168 Comparative Example 6 0.079 0.172 Comparative Example 7 0.080 0.138 Comparative Example 8 0.053 0.152

[0217] The test results show that (1) compared with the results of Example 1, Comparative Example 1 and Comparative Example 2, the wear of the spliced ​​self-lubricating polyether ether ketone three-layer composite material is reduced by 33.51% compared with the wear of a single material, and the wear resistance is greatly improved; (2) compared with the results of Example 1 and Comparative Examples 5 to 8, the friction and wear performance is poor when the tilt angle of the friction-reducing PEEK sheet exceeds 30° to 60° and the proportion of the friction-reducing PEEK sheet to the total reciprocating sliding area exceeds 8% to 30%; (3) compared with the results of Comparative Example 1 and Comparative Example 3, the friction reduction and wear resistance of the material are improved after adding layered zirconium phosphate; (4) Comparative Example 4 is a commonly used ratio of existing sliding bearing materials. Compared with the results of Example 1, Example 2, Example 3, Example 4, Example 5, Example 6 and Comparative Example 4, the wear of the spliced ​​self-lubricating polyether ether ketone three-layer composite material in this document is reduced by more than 35.32% compared with the wear of commonly used sliding bearing materials.

[0218] Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

Claims

1. A spliced ​​self-lubricating polyetheretherketone three-layer composite board, characterized in that, From bottom to top, it includes a metal substrate layer, a copper powder layer, and a spliced ​​self-lubricating layer connected in sequence. The spliced ​​self-lubricating layer is composed of several wear-resistant PEEK sheets and friction-reducing PEEK sheets arranged alternately. The angle between the friction-reducing PEEK sheets and the horizontal direction is 30° to 60°. The area of ​​the friction-reducing PEEK sheet accounts for 10% to 25% of the total sliding area of ​​the spliced ​​self-lubricating layer; The friction-reducing PEEK sheet is prepared from the following raw materials in weight percentage: 10%~20% polytetrafluoroethylene, 0.5%~3% layered zirconium phosphate, and the balance is polyether ether ketone.

2. The spliced ​​self-lubricating polyetheretherketone three-layer composite board according to claim 1, characterized in that, The particle size of polyetheretherketone (PEEK), polytetrafluoroethylene (PTFE), and layered zirconium phosphate in the raw materials used in the friction-reducing PEEK sheet decreases sequentially; the particle size of PEEK is 18 μm to 23 μm, the particle size of PTFE is 1 μm to 9 μm, and the particle size of layered zirconium phosphate is 0.5 μm to 3 μm; the particle size of PTFE is more than twice the particle size of PEEK.

3. The spliced ​​self-lubricating polyetheretherketone three-layer composite board according to claim 1, characterized in that, The wear-resistant PEEK sheet is prepared from the following raw materials in weight percentage: 2%~4% polytetrafluoroethylene, 20~25% carbon fiber, and the balance is polyetheretherketone.

4. The spliced ​​self-lubricating polyetheretherketone three-layer composite board according to claim 3, characterized in that, The raw materials used in the wear-resistant PEEK sheet have a particle size of 18μm to 23μm for polyether ether ketone and a particle size of 1μm to 9μm for polytetrafluoroethylene, and the particle size of polytetrafluoroethylene is more than twice smaller than that of polyether ether ketone; the length of the carbon fiber is 48μm to 75μm.

5. The method for preparing the spliced ​​self-lubricating polyetheretherketone three-layer composite board according to any one of claims 1 to 4, characterized in that, Includes the following steps: (1) Ingredients: Weigh out polytetrafluoroethylene, layered zirconium phosphate, carbon fiber and polyether ether ketone as raw materials according to the proportions; (2) Powder mixing: Polytetrafluoroethylene, layered zirconium phosphate and polyether ether ketone are mixed evenly to obtain friction-reducing PEEK mixed powder; Polytetrafluoroethylene, carbon fiber and polyether ether ketone are mixed evenly to obtain wear-resistant PEEK mixed powder; (3) Extrusion molding: The friction-reducing PEEK mixed powder and the wear-resistant PEEK mixed powder are poured into the extruder and extruded to obtain friction-reducing PEEK sheets and wear-resistant PEEK sheets with a thickness of 0.2mm-0.5mm; (4) Sheet cutting: Cut the sheet according to the layout design requirements; (5) Arrange the friction-reducing PEEK sheets and wear-resistant PEEK sheets alternately on the ball powder plate according to the layout design, and leave a gap of 2mm-5mm between adjacent friction-reducing PEEK sheets and wear-resistant PEEK sheets; (6) Plasticizing: The ball powder board with the sheet material laid on it is placed into a mesh belt plasticizing furnace under protective gas for plasticizing; (7) Hot rolling: After plasticization, the product is rolled using a hot rolling mill to obtain the final product.

6. The method for preparing the spliced ​​self-lubricating polyetheretherketone three-layer composite board as described in claim 5, characterized in that, The plasticizing temperature is 380–400°C, and the plasticizing time is 20–40 minutes.

7. The method for preparing the spliced ​​self-lubricating polyetheretherketone three-layer composite board as described in claim 5, characterized in that, The roll temperature of the hot rolling mill is 160℃~200℃.

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