A multi-functional sliding bearing with a biomimetic textured gradient coating and a design and preparation method thereof

Abstract

The application discloses a kind of bionic texture gradient coating multifunctional sliding bearing and its design preparation method, bearing shell matrix material is babbitt or aluminum magnesium alloy, bearing shell matrix surface has fan-shaped microtexture of imitating fish scale and alternately distributed laminated coating, the first layer of the laminated coating is ZrO2 layer, the second layer is SbNaB layer, the third layer is AlTeVN layer;Fan-shaped microtexture of imitating fish scale is arranged in the same direction, fan-shaped texture angle θ1 is 18-90 °, texture depth gradually decreases from fan-shaped circle center to edge, gradually depth angle θ2 is 32-72 °, fan-shaped texture radius r is 30-160 μm, fan-shaped texture width d is 15-65 μm, texture transverse array spacing l x 80-320 μm, texture longitudinal array spacing l y 90-360 μm.The bearing can realize multifunctional effect, under fluid lubrication condition, the bearing can play the role of reducing friction to maximum amplitude when positive rotation, can maximum amplitude improve carrying capacity when reverse rotation;ZrO2 layer has self-lubricating effect, when temperature is higher, SbNaB, AlTeVN, ZrO2 can occur in situ reaction, generate Sb2O3, V2O5 lubricant with lubricating effect, realize bearing high temperature lubrication, effectively reduce bearing wear, improve bearing life.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of bearing design and manufacturing, and particularly relates to a bionic texture gradient coating multifunctional sliding bearing and a design and preparation method thereof. BACKGROUND

[0002] The sliding bearing generates friction during work due to the contact between the shaft neck and the bearing shell, which causes the surface to heat, wear and even "seize". Therefore, when designing the bearing, the bearing shell with good friction and load bearing performance should be designed. Generally, the bearing can rotate in both directions during use, but the requirements met by the bearing during bidirectional rotation under complex working conditions may not be the same. Therefore, it is crucial to design and prepare a multifunctional bearing to meet different requirements under complex working conditions.

[0003] Chinese Patent "Application No. 201910511263.1" reports a friction-reducing and wear-resistant self-lubricating coating bearing and a preparation method thereof. The bearing is prepared by a plasma spraying method to form a hard alloy layer, a silicon nitride ceramic layer and a cubic boron nitride layer composite lubricating coating on the surface of the substrate, so as to realize the lubricating effect during work. Chinese Patent "Application No. 202010428627.2" reports a surface texture with friction reduction and oil film load bearing improvement and a preparation method thereof. The bearing surface has a reed-shaped surface texture, and the lubricating liquid forms a hydrodynamic pressure lubrication through the texture, which can improve the oil film load bearing capacity and reduce the friction. Chinese Patent "Application No. 202011477509.7" reports a high-temperature self-lubricating bearing and a preparation method thereof. An AlZnMoN+ZrAgVB nanolayer coating alternately distributed is deposited on the surface of the bearing substrate. At high temperature, AlZnMoN and ZrAgVB will react with O2 in the air to generate a high-temperature lubricant, thereby playing a lubricating role. SUMMARY

[0004] The application provides a bionic texture gradient coating multifunctional sliding bearing and a design and preparation method thereof. The bearing can realize different functions during forward rotation and reverse rotation. The bearing can maximize the reduction of the friction coefficient during forward rotation and maximize the improvement of the load bearing capacity during reverse rotation. Meanwhile, the surface gradient coating of the bearing has good lubricating and corrosion-resistant effects, and can realize self-lubrication during work, thereby reducing the wear of the bearing and improving the service life of the bearing.

[0005] Technical scheme

[0006] The bionic texture gradient coating multifunctional sliding bearing of the application is characterized in that the bearing shell substrate material is a Babbitt alloy or an aluminum-magnesium alloy, the bearing shell substrate surface has a fish scale fan-shaped micro texture (1) and an alternately distributed layer coating (2); the layer coating (2) is characterized in that the first layer is a ZrO2 layer (21), the second layer is a SbNaB layer (22), and the third layer is an AlTeVN layer (23).

[0007] The fan-shaped micro-texture (1) is arranged in the same direction, the fan-shaped texture included angle θ1 (3) is 18-90°, the texture depth gradually decreases from the center to the edge of the fan-shaped, the gradually changing depth included angle θ2 (4) is 32-72°, the fan-shaped texture radius r (5) is 30-160 μm, the fan-shaped texture width d (6) is 15-65 μm, the texture transverse array spacing l x (7) is 80-320 μm, and the texture longitudinal array spacing l y (8) is 90-360 μm. The single-layer thickness of the ZrO2 layer (21) is 10-50 nm, the single-layer thickness of the SbNaB layer (22) is 100-200 nm, and the single-layer thickness of the AlTeVN layer (23) is 100-200 nm.

[0008] The atomic percentage of each element in the SbNaB layer (22) is as follows: Sb 32-46%, Na 12-23%, and B 34-55%; and the atomic percentage of each element in the AlTeVN layer (23) is as follows: Al 26-40%, Te 15-25%, V 18-21%, and N 25-38%.

[0009] The method for manufacturing the bionic texture gradient coating multifunctional sliding bearing provided by the application is as follows:

[0010] (a) based on liquid lubrication conditions, a fan-shaped texture lubrication model is established, the Fluent simulation software is used to study the infiltration characteristics of lubricating liquid along the texture surface, the velocity field and dynamic contact angle change of the liquid in the texture are analyzed, the total work done of the infiltration spreading is calculated, the fan-shaped included angle θ1 (3) of the fan-shaped micro-texture, the texture gradually changing depth included angle θ2 (4), the fan-shaped texture radius r (5) and the fan-shaped texture width d (6) are preliminarily optimized with high infiltration and high total work done as the target;

[0011] (b) the Fluent simulation software is used to study the oil film carrying capacity and friction coefficient of the fan-shaped micro-texture surface with different geometric parameters and array forms under two different rotating directions of the bearing bush (the relative motion direction from the center to the edge of the fan-shaped texture is positive rotation, and the relative motion direction from the edge to the center of the fan-shaped texture is reverse rotation), the fan-shaped included angle θ1 (3) of the fan-shaped micro-texture, the texture gradually changing depth included angle θ2 (4), the fan-shaped texture radius r (5), the fan-shaped texture width d (6), the texture transverse array spacing l x (7) and the texture longitudinal array spacing ly (8);

[0012] (c) Combining steps (a) and (b) to optimize the geometric parameters and array form of the fan-shaped texture, the included angle θ1(3) of the fan-shaped texture is 18-90°, the included angle θ2(4) of the texture gradient depth is 32-62°, the radius r(5) of the fan-shaped texture is 30-160μm, the width d(6) of the fan-shaped texture is 15-65μm, and the transverse array spacing l of the texture is... x (7) is 80-320μm, and the longitudinal array spacing of the texture is l. y (8) is 90-360μm.

[0013] The present invention discloses a method for manufacturing a biomimetic textured gradient-coated multifunctional sliding bearing, the gradient coating design method of which is as follows:

[0014] (d) Using ANSYS simulation software, the interfacial stress of ZrO2 layer (21), SbNaB layer (22), and AlTeVN layer (23) with different thicknesses was analyzed. Combined with the Tsui-Clyne and Stoney formulas, a residual stress model of the coating interface was established. With the goal of minimizing stress, the single layer thickness of ZrO2 layer (21), SbNaB layer (22), and AlTeVN layer (23) and the total number of layers of the stacked coating (2) were optimized.

[0015] (e) By optimizing the method in step (d), a single layer of ZrO2 layer (21) with a thickness of 10-50 nm, a single layer of SbNaB layer (22) with a thickness of 100-200 nm, and a single layer of AlTeVN layer (23) with a thickness of 100-200 nm are obtained; the stacked coating (2) contains 2-5 layers of ZrO2 layer (21), 2-5 layers of SbNaB layer (22) and 2-5 layers of AlTeVN layer (23).

[0016] The present invention discloses a method for manufacturing a biomimetic textured gradient coated multifunctional sliding bearing, the specific preparation steps of which are as follows:

[0017] (f) Preparation of imitation fish scale fan-shaped microtexture: Imitation fish scale fan-shaped microtexture was processed on the surface of the bearing using nanosecond laser processing technology (1). The laser processing power was 10-20W and the scanning speed was 2-100mm / s.

[0018] (g) Preparation of ZrO2 layer (21): Atom layer deposition technology was used to deposit ZrO2 layer (21) on the microtextured surface; ZrCl4 and O3 were used as metal source and oxygen source, the deposition temperature was 300-400℃, the number of cycles was 100-500 times, so that the thickness of ZrO2 layer (21) was 10-50nm.

[0019] (h) SbNaB layer (22) preparation: SbNaB layer (22) is deposited on the surface of ZrO2 layer (21) by magnetron sputtering technology, the deposition temperature is 150-250℃, the working pressure is 1.0-2.2Pa, the bias voltage is 200-350V, the SbNaB composite target current is 80-100A, and the deposition time is 2-10min, so that the single-layer thickness of SbNaB layer (22) is 100-500nm;

[0020] (i) AlTeVN layer (23) preparation: AlTeVN layer (23) is deposited on the surface of SbNaB layer (22) by magnetron sputtering technology, the deposition temperature is 150-250℃, the working pressure is 1.0-2.2Pa, the bias voltage is 200-350V, the N2 flow rate is 60-100sccm, the AlTeV composite target current is 60-80A, so that the single-layer thickness of AlTeVN layer (23) is 100-500nm;

[0021] (j) repeating steps (g), (h), (j), alternately depositing ZrO2 layer (21), SbNaB layer (22) and AlTeVN layer (23), so that the stacked coating (2) contains 2-5 layers of ZrO2 layer (21), 2-5 layers of SbNaB layer (22) and 2-5 layers of AlTeVN layer (23).

[0022] Advantages

[0023] 1. The sliding bearing bush surface texture prepared by the present application can realize different functions in bearing forward rotation and reverse rotation; 2. Under liquid lubrication conditions, when the relative motion direction of the bearing is forward rotation from the center to the edge of the fan-shaped fish scale structure, the maximum amplitude of the friction coefficient can be reduced, and when the relative motion direction of the bearing is reverse rotation from the edge to the center of the fan-shaped fish scale structure, the maximum amplitude of the oil film carrying capacity can be increased; 3. The coating has self-lubricating effect, at low temperature, the ZrO2 layer has self-lubricating effect, at high temperature, SbNaB, AlTeVN and ZrO2 can react in situ to generate Sb2O3 and V2O5 lubricants with lubricating effect, realizing high-temperature lubrication of the bearing, effectively reducing the wear of the bearing and prolonging the service life of the bearing; 4. The SbNaB layer of the present application has good corrosion resistance due to the addition of Na element; the AlTeVN layer has good thermal conductivity due to the addition of Te element, which can reduce friction heat; 5. The coating design method provided by the present application can minimize the internal stress of the coating, and theoretically optimize the coating structure; 6. The ZrO2 layer on the surface of the bush of the present application is prepared by atomic layer deposition technology, which can realize the dense combination of the ZrO2 layer with the substrate and the ZrO2 single layer with the SbNaB and AlTeVN layers, and improve the bonding strength; 7. The bearing can be applied to different use requirement occasions of forward rotation and reverse rotation under complex working conditions. BRIEF DESCRIPTION OF DRAWINGS

[0024] Figure 1 Figure 1 is a schematic diagram of a multifunctional sliding bearing structure of a biomimetic gradient coating of the present application, Figure 2 Figure 2 is a schematic diagram of a single fish scale fan-shaped micro-texture of the present application; Figure 3 Figure 3 is a schematic diagram of an array distribution of fish scale fan-shaped micro-texture of the present application; Figure 4 Figure 4 is a calculation diagram of oil film carrying capacity of fish scale fan-shaped micro-texture, wherein 0 is the base material of the bearing shell, 1 is the micro-texture, 2 is the laminated coating, 21 is the ZrO2 layer, 22 is the SbNaB layer, 23 is the AlTeVN layer, 3 is the fan-shaped texture included angle θ1, 4 is the texture gradient depth included angle θ2, 5 is the fan-shaped texture radius r, 6 is the fan-shaped texture width d, 7 is the texture transverse array spacing l x , and 8 is the texture longitudinal array spacing l y . DETAILED DESCRIPTION

[0025] The technical solutions of the present application will be illustrated below with reference to the accompanying drawings.

[0026] Example 1

[0027] The multifunctional sliding bearing of the biomimetic gradient coating of the present application has a base material of the bearing shell of Babbitt alloy, a fish scale fan-shaped micro-texture (1) on the surface of the base material of the bearing shell, and a laminated coating (2) alternately distributed; the laminated coating (2) has a first layer of ZrO2 layer (21), a second layer of SbNaB layer (22), and a third layer of AlTeVN layer (23). The fish scale fan-shaped micro-textures are arranged in the same direction, the fan-shaped texture included angle θ1 (3) is 22°, the texture depth gradually decreases from the center of the fan-shaped circle to the edge, the gradient depth included angle θ2 (4) is 36°, the fan-shaped texture radius r (5) is 40 μm, the fan-shaped texture width d (6) is 15 μm, the texture transverse array spacing l x (7) is 120 μm, and the texture longitudinal array spacing l y (8) is 120 μm; the single layer thickness of the ZrO2 layer (21) is 10 nm, the single layer thickness of the SbNaB layer (22) is 100 nm, and the single layer thickness of the AlTeVN layer (23) is 100 nm; the laminated coating (2) contains 5 layers of ZrO2 layer (21), 5 layers of SbNaB layer (22), and 5 layers of AlTeVN layer (23).

[0028] In the SbNaB layer (22), the atomic percentage of each element is: Sb 32%, Na 16%, and B 52%; in the AlTeVN layer (23), the atomic percentage of each element is: Al 34%, Te 22%, V 19%, and N 25%.

[0029] The application relates to a method for manufacturing a multifunctional sliding bearing with a biomimetic gradient-coating, and a design method of a fan-shaped micro-texture as follows.

[0030] (a) Based on liquid lubrication conditions, a fan-shaped texture lubrication model is established, the infiltration characteristics of lubricating liquid along the texture surface are studied by using Fluent simulation software, the velocity field and dynamic contact angle change of the liquid in the texture are analyzed, and the total work done of the infiltration spreading is calculated. The fan-shaped included angle θ1(3) of the fan-shaped micro-texture is preliminarily optimized to be 18-28°, the texture gradient depth included angle θ2(4) is 32-45°, the fan-shaped texture radius r(5) is 30-46 μm, and the fan-shaped texture width d(6) is 15-22 μm.

[0031] (b) The oil film carrying capacity and friction coefficient of the fan-shaped micro-texture surface with different geometric parameters and array forms under two different rotating directions (the relative motion direction from the center to the edge of the fan-shaped texture is positive rotation, and the relative motion direction from the edge to the center of the fan-shaped texture is reverse rotation) of the bearing bush are studied by using Fluent simulation software. The fan-shaped included angle θ1(3) of the fan-shaped micro-texture is further optimized to be 20-36°, the texture gradient depth included angle θ2(4) is 32-40°, the fan-shaped texture radius r(5) is 40-55 μm, the fan-shaped texture width d(6) is 10-20 μm, the texture transverse array spacing l x (7) is 120-180 μm, and the texture longitudinal array spacing l y (8) is 90-120 μm.

[0032] (c) The fan-shaped texture geometric parameters and array forms are obtained by comprehensively optimizing steps (a) and (b), the fan-shaped included angle θ1(3) of the fan-shaped micro-texture is 22°, the texture gradient depth included angle θ2(4) is 36°, the fan-shaped texture radius r(5) is 40 μm, the fan-shaped texture width d(6) is 15 μm, the texture transverse array spacing l x (7) is 120 μm, and the texture longitudinal array spacing l y (8) is 90 μm.

[0033] The application relates to a method for manufacturing a multifunctional sliding bearing with a biomimetic gradient-coating, and a design method of a fan-shaped micro-texture as follows.

[0034] (d) The interface stress of ZrO2 layers (21), SbNaB layers (22) and AlTeVN layers (23) with different thicknesses is analyzed by using ANSYS simulation software, a coating interface residual stress model is established by combining Tsui-Clyne and Stoney formula, and the single-layer thickness of the ZrO2 layer (21), the SbNaB layer (22) and the AlTeVN layer (23) and the total number of the stacked coating (2) are optimized with the minimum stress as the target.

[0035] (e) By optimizing the method of step (d), the thickness of the ZrO2 layer (21) is 10 nm, the thickness of the SbNaB layer (22) is 120 nm, and the thickness of the AlTeVN layer (23) is 120 nm; the stack coating (2) contains 5 layers of ZrO2 layer (21), 5 layers of SbNaB layer (22) and 5 layers of AlTeVN layer (23).

[0036] The method for manufacturing a biomimetic textured gradient coating multifunctional sliding bearing of the application has the following specific preparation steps:

[0037] (f) Fish scale fan-shaped micro-texture preparation: nanosecond laser processing technology is used to process fish scale fan-shaped micro-texture (1) on the surface of the bearing shell, the laser processing power is 12 W, and the scanning speed is 2 mm / s;

[0038] (g) ZrO2 layer (21) preparation: atomic layer deposition technology is used to deposit ZrO2 layer (21) on the surface of the micro-texture; ZrCl4 and O3 are used as metal source and oxygen source, the deposition temperature is 300℃, and the cycle number is 100 times, so that the thickness of the ZrO2 layer (21) is 10 nm;

[0039] (h) SbNaB layer (22) preparation: magnetic sputtering technology is used to deposit SbNaB layer (22) on the surface of the ZrO2 layer (21), the deposition temperature is 150℃, the working gas pressure is 1.0 Pa, the bias voltage is 200 V, the SbNaB composite target current is 80 A, and the deposition time is 3 min, so that the thickness of the SbNaB layer (22) is 120 nm;

[0040] (i) AlTeVN layer (23) preparation: magnetic sputtering technology is used to deposit AlTeVN layer (23) on the surface of the SbNaB layer (22), the deposition temperature is 160℃, the working gas pressure is 1.0 Pa, the bias voltage is 200 V, the N2 flow rate is 60 sccm, the AlTeV composite target current is 60 A, and the thickness of the AlTeVN layer (23) is 120 nm;

[0041] (j) Repeat steps (g), (h), (j), and alternately deposit ZrO2 layer (21), SbNaB layer (22) and AlTeVN layer (23), so that the stack coating (2) contains 5 layers of ZrO2 layer (21), 5 layers of SbNaB layer (22) and 5 layers of AlTeVN layer (23).

[0042] Example 2:

[0043] The application discloses a biomimetic texture gradient coating multifunctional sliding bearing, wherein the bearing shell base body material is an aluminum-magnesium alloy, the bearing shell base body surface is provided with fan-shaped micro-texture (1) and alternating distributed laminated coating (2); the laminated coating (2) is provided with ZrO2 layer (21) as the first layer, SbNaB layer (22) as the second layer and AlTeVN layer (23) as the third layer.

[0044] The fan-shaped micro-texture is arranged in the same direction, the fan-shaped texture included angle θ1 (3) is 90°, the texture depth gradually decreases from the fan-shaped center to the edge, the gradual depth included angle θ2 (4) is 62°, the fan-shaped texture radius r (5) is 120 μm, the fan-shaped texture width d (6) is 55 μm, the texture transverse array spacing l x (7) is 300 μm, the texture longitudinal array spacing l y (8) is 320 μm; the single-layer thickness of the ZrO2 layer (21) is 50 nm, the single-layer thickness of the SbNaB layer (22) is 200 nm, and the single-layer thickness of the AlTeVN layer (23) is 200 nm; the laminated coating (2) contains two ZrO2 layers (21), two SbNaB layers (22) and two AlTeVN layers (23).

[0045] The atom percentage of each element in the SbNaB layer (22) is as follows: Sb 46%, Na 18%, and B 36%; the atom percentage of each element in the AlTeVN layer (23) is as follows: Al 40%, Te 15%, V 18%, and N 27%.

[0046] The application discloses a method for manufacturing a biomimetic texture gradient coating multifunctional sliding bearing.

[0047] (a) based on liquid lubrication conditions, a fan-shaped texture lubrication model is established, the Fluent simulation software is adopted to study the wetting characteristics of lubricating liquid along the texture surface, the velocity field and dynamic contact angle change of the liquid in the texture are analyzed, the total work done of wetting and spreading is calculated, the fan-shaped included angle θ1 (3) of the fan-shaped micro-texture is preliminarily optimized to be 80-92°, the texture gradual depth included angle θ2 (4) is preliminarily optimized to be 54-62°, the fan-shaped texture radius r (5) is preliminarily optimized to be 100-120 μm, and the fan-shaped texture width d (6) is preliminarily optimized to be 50-55 μm, with high wetting and high total work done as the target;

[0048] (b) using Fluent simulation software to study the oil film carrying capacity and friction coefficient of the fish scale-shaped micro-textured surface with different geometric parameters and array forms under two different rotation directions (the relative motion direction from the center to the edge of the fan-shaped texture is positive rotation, and the relative motion direction from the edge to the center of the fan-shaped texture is reverse rotation), and taking low friction coefficient in positive rotation and high oil film carrying capacity in reverse rotation as the target, further optimizing the fan-shaped angle θ1(3) of the fish scale-shaped micro-textured fan-shaped angle to 70-90°, the texture gradient depth angle θ2(4) to 60-65°, the fan-shaped texture radius r(5) to 110-130 μm, the fan-shaped texture width d(6) to 45-60 μm, the texture transverse array spacing l x (7) to 250-300 μm, and the texture longitudinal array spacing l y (8) to 320-350 μm.

[0049] (c) comprehensively optimizing the geometric parameters and array forms of the fan-shaped texture according to steps (a) and (b), and taking the fan-shaped angle θ1(3) of the fish scale-shaped micro-textured fan-shaped angle to 90°, the texture gradient depth angle θ2(4) to 62°, the fan-shaped texture radius r(5) to 120 μm, the fan-shaped texture width d(6) to 55 μm, the texture transverse array spacing l x (7) to 300 μm, and the texture longitudinal array spacing l y (8) to 320 μm.

[0050] A method for manufacturing a bionic texture gradient coating multifunctional sliding bearing is provided, and the gradient coating design method is as follows:

[0051] (d) using ANSYS simulation software to analyze the interface stress of ZrO2 layers (21), SbNaB layers (22) and AlTeVN layers (23) with different thicknesses, combining Tsui-Clyne and Stoney formulas, establishing a coating interface residual stress model, and optimizing the single-layer thickness of the ZrO2 layers (21), SbNaB layers (22) and AlTeVN layers (23) and the total number of the stacked coating (2) layers;

[0052] (e) through the optimization method in step (d), the single-layer thickness of the ZrO2 layers (21) is 50 nm, the single-layer thickness of the SbNaB layers (22) is 200 nm, the single-layer thickness of the AlTeVN layers (23) is 200 nm, and the stacked coating (2) contains 2 layers of ZrO2 layers (21), 2 layers of SbNaB layers (22) and 2 layers of AlTeVN layers (23).

[0053] The method for manufacturing a bionic texture gradient coating multifunctional sliding bearing provided by the application has the following specific preparation steps:

[0054] (f) Fish scale-like fan micro-texture preparation: a fish scale-like fan micro-texture (1) is machined on the surface of the bearing bush by using a nanosecond laser processing technology, the laser processing power is 20 W, and the scanning speed is 100 mm / s;

[0055] (g) ZrO2 layer (21) preparation: a ZrO2 layer (21) is deposited on the surface of the micro-texture by using an atomic layer deposition technology; ZrCl4 and O3 are used as the metal source and the oxygen source, the deposition temperature is 400°C, the cycle number is 500, and the single-layer thickness of the ZrO2 layer (21) is 50 nm;

[0056] (h) SbNaB layer (22) preparation: a SbNaB layer (22) is deposited on the surface of the ZrO2 layer (21) by using a magnetron sputtering technology, the deposition temperature is 250°C, the working gas pressure is 2.2 Pa, the bias voltage is 350 V, the SbNaB composite target current is 100 A, the deposition time is 10 min, and the single-layer thickness of the SbNaB layer (22) is 500 nm;

[0057] (i) AlTeVN layer (23) preparation: an AlTeVN layer (23) is deposited on the surface of the SbNaB layer (22) by using a magnetron sputtering technology, the deposition temperature is 250°C, the working gas pressure is 2.2 Pa, the bias voltage is 350 V, the N2 flow rate is 100 sccm, the AlTeV composite target current is 80 A, and the single-layer thickness of the AlTeVN layer (23) is 1500 nm;

[0058] (j) Repeating steps (g), (h), and (j) alternately to deposit the ZrO2 layer (21), the SbNaB layer (22), and the AlTeVN layer (23) to make the laminated coating (2) contain 2 layers of ZrO2 layers (21), 2 layers of SbNaB layers (22), and 2 layers of AlTeVN layers (23).

Claims

1. A multi-functional sliding bearing with a biomimetic textured gradient coating, comprising a bearing shell base (0) made of a Babbitt alloy or an aluminium-magnesium alloy, characterized in that: The surface of the bush base body (0) has fan-shaped micro-texture (1) and alternating distribution of laminated coating (2); the laminated coating (2) comprises a first layer of ZrO2 layer (21), a second layer of SbNaB layer (22) and a third layer of AlTeVN layer (23); The fan-shaped micro-texture (1) has a consistent arrangement direction, the fan-shaped micro-texture (1) has a fan-shaped texture included angle θ1 (3) of 18-90°, the texture depth of the fan-shaped micro-texture (1) gradually decreases from the center to the edge of the fan-shaped circle, the gradient depth included angle θ2 (4) is 32-72°, the fan-shaped texture radius r (5) of the fan-shaped micro-texture (1) is 30-160 μm, and the fan-shaped texture width d (6) of the fan-shaped micro-texture (1) is 15-65 μm; the texture transverse array spacing l x (7) of the fan-shaped micro-texture (1) is 80-320 μm, and the texture longitudinal array spacing l y (8) of the fan-shaped micro-texture (1) is 90-360 μm; the single-layer thickness of the ZrO2 layer (21) is 10-50 nm, the single-layer thickness of the SbNaB layer (22) is 100-200 nm, and the single-layer thickness of the AlTeVN layer (23) is 100-200 nm; the laminated coating (2) contains 2-5 layers of ZrO2 layers (21), 2-5 layers of SbNaB layers (22) and 2-5 layers of AlTeVN layers (23). The atomic percentage of each element in the SbNaB layer (22) is: Sb 32-46%, Na 12-23%, B 34-55%; the atomic percentage of each element in the AlTeVN layer (23) is: Al 26-40%, Te 15-25%, V 18-21%, N 25-38%.

2. A method for manufacturing a biomimetic textured gradient coating multifunctional sliding bearing according to claim 1, the design method of the fan-shaped micro-texture being as follows: 2-1) Based on the liquid lubrication condition, a fan-shaped textured lubrication model is established, the Fluent simulation software is used to study the wetting characteristics of the lubricating liquid along the textured surface, the velocity field and dynamic contact angle change of the liquid in the texture are analyzed, and the total work done of wetting and spreading is calculated, with high wetting and high total work as the target, the fan-shaped micro-texture fan-shaped included angle θ1(3), the texture gradual depth included angle θ2(4), the fan-shaped texture radius r(5) and the fan-shaped texture width d(6) are preliminarily optimized; 2-2) Using Fluent simulation software to study the oil film carrying capacity and friction coefficient of the fan-shaped micro-textured surface with different geometric parameters and array forms under two different rotating directions of the bearing bush, The relative motion direction of the bearing bush and the journal is from the center of the fan-shaped texture to the edge for forward rotation and from the edge to the center for reverse rotation, the fan-shaped angle θ1(3) of the fish scale-like fan-shaped micro-texture is further optimized, the texture gradient depth angle θ2(4), the fan-shaped texture radius r(5), the fan-shaped texture width d(6), the texture transverse array spacing l x (7), and the texture longitudinal array spacing l y (8); 2-3) The fan-shaped texture geometric parameters and array form are obtained by comprehensively optimizing steps 2-1 and 2-2, the fan-shaped texture included angle θ1(3) is 18-90°, the texture gradually deepened depth included angle θ2(4) is 32-62°, the fan-shaped texture radius r(5) is 30-160 μm, the fan-shaped texture width d(6) is 15-65 μm, the texture transverse array spacing l x (7) is 80-320 μm, the texture longitudinal array spacing l y (8) is 90-360 μm.

3. A method for manufacturing a biomimetic textured gradient coating multifunctional sliding bearing according to claim 1, the design method of the gradient coating being as follows: 3-1) The ANSYS simulation software is used to analyze the interface stress of ZrO2 layer (21), SbNaB layer (22) and AlTeVN layer (23) with different thicknesses, the Tsui-Clyne and Stoney formulas are combined to establish a coating interface residual stress model, and the single-layer thickness of ZrO2 layer (21), SbNaB layer (22) and AlTeVN layer (23) and the total number of laminated coating (2) are optimized with the minimum stress as the target; 3-2) Through the optimization method of step 3-1, the single-layer thickness of ZrO2 layer (21) is 10-50 nm, the single-layer thickness of SbNaB layer (22) is 100-200 nm, and the single-layer thickness of AlTeVN layer (23) is 100-200 nm; the laminated coating (2) contains 2-5 layers of ZrO2 layer (21), 2-5 layers of SbNaB layer (22) and 2-5 layers of AlTeVN layer (23).

4. The method according to claim 3, the specific preparation steps being as follows: 4-1) Fan-shaped micro-texture preparation: nanosecond laser processing technology is used to process fan-shaped micro-texture (1) on the surface of the bush; the laser processing power is 10-20 W, and the scanning speed is 2-100 mm / s; 4-2) ZrO2 layer (21) preparation: atomic layer deposition technology is used to deposit ZrO2 layer (21) on the micro-texture surface; ZrCl4 and O3 are used as metal source and oxygen source, the deposition temperature is 300-400 ℃, and the cycle number is 100-500 times, so that the single-layer thickness of ZrO2 layer (21) is 10-50 nm; 4-3) Preparation of SbNaB layer (22): SbNaB layer (22) is deposited on the surface of ZrO2 layer (21) by magnetron sputtering technology, the deposition temperature is 150-250℃, the working pressure is 1.0-2.2Pa, the bias voltage is 200-350V, the current of SbNaB composite target is 80-100A, and the deposition time is 2-10min, so that the single-layer thickness of SbNaB layer (22) is 100-500nm; 4-4) Preparation of AlTeVN layer (23): AlTeVN layer (23) is deposited on the surface of SbNaB layer (22) by magnetron sputtering technology, the deposition temperature is 150-250℃, the working pressure is 1.0-2.2Pa, the bias voltage is 200-350V, the N2 flow rate is 60-100sccm, the current of AlTeV composite target is 60-80A, so that the single-layer thickness of AlTeVN layer (23) is 100-500nm; 4-5) Repeat steps 4-2, 4-3 and 4-4 to alternately deposit ZrO2 layer (21), SbNaB layer (22) and AlTeVN layer (23), so that the stacked coating (2) contains 2-5 layers of ZrO2 layer (21), 2-5 layers of SbNaB layer (22) and 2-5 layers of AlTeVN layer (23).

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