Oil storage type ceramic bearing ring with multi-scale nested texture and processing method thereof

Abstract

The application discloses an oil storage type ceramic bearing ring with a multi-scale nested texture and a processing method thereof. The multi-scale nested texture is composed of a first-order hexagonal honeycomb oil storage cellar and a second-order directional nano stripe formed by laser processing. The first-order hexagonal honeycomb oil storage cellar is formed by densely arranged pressure grids, and the physical storage of lubricating oil is realized by using recessed geometric space to resist centrifugal oil throwing. The second-order directional nano stripe is in-situ nested on the bottom surface and the side wall surface of the honeycomb oil storage cellar, and the texture vector points to the center of the contact track of the groove. The application uses the capillary adsorption force of the nano stripe to lock the lubricating oil on the inner wall and guide the oil to be supplied to the friction interface along the side wall. The multi-scale nested texture protects the microstructure from being worn and improves the dynamic stability of the oil film and the service life of the bearing under extreme working conditions.

Description

Technical Field

[0001] This invention relates to the field of ceramic bearing manufacturing technology, specifically to an oil-storage ceramic bearing ring with a multi-scale nested texture and its processing method. Background Technology

[0002] With the rapid development of aerospace, machine tool spindles, and new energy vehicles, high speed, high temperature, and high reliability have become the development trend of rolling bearings. Ceramic bearings, with their excellent properties such as low density, high hardness, corrosion resistance, and good thermal stability, have become core basic components of high-end equipment. However, under high-speed operating conditions, the lubricating medium on the surface of the ceramic bearing raceway is subjected to enormous centrifugal force, easily being thrown off to both sides of the raceway, leading to insufficient lubrication or even dry friction in the center area of ​​the contact track. This not only exacerbates friction and wear but also generates a large amount of frictional heat, seriously affecting the service life and operating accuracy of the bearing.

[0003] Patent CN110205604A discloses a gradient diamond / graphite composite self-lubricating and friction-reducing engineering ceramic coating and its manufacturing method. This patent involves sequentially applying multi-level diamond coatings and multiple layers of graphite coatings outward from the surface of an engineering ceramic substrate to enhance the self-lubricating performance of the ceramic bearing during use. Patent CN121739018A discloses a deep groove ball bearing cage structure and its manufacturing method. This patent features an arc-shaped boss on the inner side of the semi-circular ball pocket of the cage, utilizing the oil reservoir formed around the arc-shaped boss to improve the lubrication effect during bearing operation.

[0004] These technical solutions mainly utilize the friction-reducing effect of heterogeneous coatings and the oil-storing effect of cages. They cannot effectively prevent the lubricating oil from flowing outward due to centrifugal force, nor can they reverse the oil in the non-contact area of ​​the raceway back to the contact center. As a result, under ultra-high-speed conditions, it is difficult for the friction interface to form and maintain a stable dynamic lubricating oil film, and the bearing is very prone to abnormal wear due to local lack of oil.

[0005] Furthermore, Chinese invention patent CN108571514A discloses a semi-elliptical textured surface for radial sliding bearings, which is based on a circular pit texture arranged in a rectangular grid array, defining a semi-elliptical distribution area for texture arrangement. This scheme improves the hydrodynamic pressure effect by geometrically defining the texture distribution area, but its texture is only a single-scale circular pit morphology, lacking the synergistic function of multi-scale graded oil storage and directional transport, and has limited oil-locking ability under ultra-high-speed centrifugal oil-throwing conditions.

[0006] Chinese invention patent CN118088583A discloses a fish-scale-like biomimetic texture that enhances the wear resistance and drag reduction performance of thrust ball bearings. It employs a scale-like array of grooves to utilize hydrodynamic lubrication to improve oil film load-bearing capacity. However, this design is only a single-scale micron-level texture and does not involve nested nanoscale stripes. Its oil storage and transport capabilities depend on the geometry of the grooves themselves, lacking an active guiding mechanism for directional capillary transport.

[0007] Chinese invention patent CN110645264A discloses a rolling bearing inner ring raceway and a rolling bearing. The raceway surface features a dynamic lubrication texture (micro-dimples) in the central region, an oil storage texture (micro-dimples) on the side regions, and an oil distribution texture (micro-grooves) that partially overlaps with both. This design improves lubrication performance through the synergistic effect of these three texture zones. However, all textures are independent structures at the micrometer scale, and the different textures are in a planar partitioning relationship rather than a longitudinal nesting relationship. Furthermore, it does not involve the capillary adsorption function of nanoscale oriented stripes.

[0008] Chinese invention patent CN118407976A discloses a sliding layer, a rotating shaft for a sliding bearing, and a processing method. The sliding layer is constructed with an oil-distributing textured area (microgrooves) and an oil-storing textured area (micropits) on its surface. In this design, the microgrooves and micropits are independent micron-level textures arranged in planar partitions, without the vertical nesting relationship between primary micron structures and secondary nanostructures. Furthermore, the processing target is a copper alloy sliding layer rather than a ceramic substrate, resulting in fundamental differences in processing technology and material properties compared to ceramic bearings.

[0009] In summary, while existing technologies have improved bearing lubrication performance through methods such as cage oil storage structures, heterogeneous self-lubricating coatings, single-scale surface textures, and multi-texture zoned arrangements, none of them have solved the problem of oil starvation in the contact area caused by centrifugal oil spillage under ultra-high-speed conditions. There is an urgent need in this field for a graded oil control scheme that can simultaneously achieve physical oil storage to resist centrifugal force and directional oil delivery to maintain contact. Summary of the Invention

[0010] To address the aforementioned technical problems, this invention proposes an oil-storing ceramic bearing ring with a multi-scale nested texture and its processing method. The aim is to solve the problem of insufficient oil in the contact area of ​​ceramic bearings under high-speed operating conditions due to centrifugal oil spillage through micro-nano-level geometric morphology reconstruction. This invention not only utilizes the synergistic effect of the micro-nano hierarchical structure to achieve physical storage of lubricating oil to counteract centrifugal oil spillage, but also utilizes directional nanotextures to guide lubricating oil to actively replenish the contact center to maintain dynamic oil film stability.

[0011] The technical means employed in this invention are as follows: An oil-storing ceramic bearing ring with a multi-scale nested texture includes a surface nested texture with graded oil control function and a ceramic substrate. The surface nested texture consists of a primary hexagonal honeycomb oil reservoir and secondary oriented nanostripes nested on its inner surface. The primary hexagonal honeycomb oil reservoir forms interconnected hexagonal sidewalls through dense arrangement, constituting an isotropically compressed grid frame to improve the structural stability and load-bearing capacity of the ring surface; the secondary oriented nanostripes are laser-induced periodic structures distributed on the bottom and inner sidewall surfaces of the hexagonal honeycomb oil reservoir, forming a functional surface with capillary adhesion.

[0012] Furthermore, the common wall top surface between the primary hexagonal honeycomb oil reservoirs is a flat, textureless plane, used to form a smooth geometric contact interface with the rolling elements during bearing operation. The secondary directional nanostripes are completely housed within the recessed space of the primary hexagonal honeycomb oil reservoirs, forming a spatial height difference with the common wall top surface to protect the nanostripes from direct shear wear by the rolling elements. The orientation of the secondary directional nanostripes is controlled by a laser polarization vector, with its texture vector pointing towards the center of the contact trajectory of the raceway groove. Under high-speed rotation conditions, the nanostripes utilize capillary adhesion to lock the lubricating oil onto the inner wall and guide the lubricating oil to the friction interface for directional replenishment.

[0013] Furthermore, the diameter of each individual unit of the primary hexagonal honeycomb oil storage cell is 60-100 μm and the depth is 15-25 μm; the width of the common wall between two adjacent oil storage cells is 10-20 μm; and the period of the secondary directional nano-stripes is 400-800 nm and the depth is 100-300 nm.

[0014] Furthermore, the orientation of the secondary oriented nanostripes is controlled by a laser polarization vector, with the texture vector pointing towards the center of the contact trajectory of the groove. The angle between the orientation of the secondary oriented nanostripes and the circumferential vector of the groove is 5°-15°, forming oil guiding channels that converge toward the center on both sides of the center of the groove contact trajectory.

[0015] Furthermore, the ceramic matrix is ​​selected from any one of silicon nitride, zirconium oxide, or silicon carbide ceramics.

[0016] This invention also discloses a method for processing an oil-retaining ceramic bearing ring with a multi-scale nested texture, comprising the following steps: Step 1: Grind and polish the grooves of the ceramic ring to obtain an arc-shaped base with a preset roughness, and then perform ultrasonic cleaning. Step 2: A femtosecond laser beam is used to perform a preset cellular path scan. By adjusting the energy flux density gradient distribution within the laser spot, a micron-sized oil reservoir is formed at the center of the spot through ablation. Simultaneously, the low-energy induction zone at the edge of the spot is used to induce the formation of secondary directional nanostripes on the inner surface of the reservoir. Step 3: Cleaning removes physical splashes to obtain a lubricated surface with micro-nano composite features.

[0017] Furthermore, in step 2, the femtosecond laser pulse width is 200-500 fs, and the spot overlap rate is 50%-80%. The direction of the nanostripes is controlled by adjusting the laser polarization vector, so that they point towards the center of the channel contact trajectory.

[0018] Thirdly, the present invention also discloses the application of an oil-storage ceramic bearing ring with a multi-scale nested texture in high-speed bearing lubrication replenishment.

[0019] Specifically, under high-speed bearing operation, the primary hexagonal honeycomb oil storage cell physically stores lubricating oil through its concave volume to counteract centrifugal oil spillage. The secondary directional nano-stripes use capillary adsorption to lock the lubricating oil onto the inner wall and guide the lubricating oil to be directionally replenished to the friction interface along the side wall. The multi-scale hierarchical synergistic effect of the primary hexagonal honeycomb oil storage cell and the secondary directional nano-stripes enhances the dynamic stability of the oil film.

[0020] The present invention has the following beneficial effects: (1) This invention achieves physical storage of lubricating oil through the concave geometric space of a primary hexagonal honeycomb oil storage cellar. This concave geometric space provides a large lubricating oil storage volume. Under ultra-high-speed rotation conditions, the physical retention effect of the concave space effectively counteracts the tendency of lubricating oil to flow outwards driven by centrifugal force, solving the problem of rapid oil depletion in traditional planar channels under centrifugal action. The honeycomb continuous grid structure of this invention provides a larger oil storage volume and more uniform mechanical support.

[0021] Simultaneously, this invention incorporates in-situ nested nanoscale directional stripes on the inner surface of the honeycomb oil storage cellar. Capillary adhesion is used to lock the lubricating oil onto the inner wall, guiding it towards the friction interface along the sidewall. The orientation of the nanostripes is precisely controlled by laser polarization vector adjustment, directing them towards the center of the channel contact trajectory. The capillary force exerted by the stripes on the oil points towards the contact center, thus achieving active directional replenishment of lubricating oil from the storage cellar along the sidewall to the friction interface. Utilizing the energy flux density gradient distribution effect during a single femtosecond laser scan, the simultaneous completion of the micron-level honeycomb oil storage cellar ablation and the generation of nanoscale stripes is achieved. Compared to the stepwise preparation of micron-level textures and nanostructures in existing technologies, this integrated processing strategy significantly simplifies the process flow. More importantly, it ensures the spatial positioning accuracy and morphological continuity between the nanostripes and the inner wall of the micron-level oil storage cellar.

[0022] This invention utilizes the synergistic effect of micro-nano hierarchical structures to solve the problem of lean lubrication under ultra-high speed conditions, and significantly improves the stability of dynamic oil film.

[0023] (2) The grid formed by the honeycomb sidewalls ensures the mechanical stability and load-bearing capacity of the raceway surface. The top surface of the honeycomb common wall is a flat, texture-free plane, ensuring the geometric contact accuracy between the rolling elements and the raceway. Since the secondary nano-stripes are completely residing in the recessed oil reservoir space, a physical protective barrier is formed by the height difference, avoiding direct shear wear between the nano-textures and the rolling elements, and greatly extending the self-lubricating life of the raceway under extreme service scenarios. Attached Figure Description

[0024] Figure 1 This refers to the textured area of ​​the ceramic bearing race in an example of the present invention.

[0025] Figure 2 This is a schematic diagram of the primary hexagonal honeycomb oil storage cell of the ceramic bearing ring in an example of the present invention.

[0026] Figure 3 This is a schematic diagram of the secondary oriented nano-stripes on the ceramic bearing ring in an example of the present invention.

[0027] Among them, 1. the textured area of ​​the channel; 2. the inner ring of the ceramic bearing; 3. the contact trajectory center of the channel, i.e. the circumferential vector of the channel; 4. the honeycomb oil storage cellar; 5. the common wall; 6. the nano-stripes at the bottom of the honeycomb oil storage cellar. Detailed Implementation

[0028] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be described in more detail below with reference to embodiments. It should be understood that the specific embodiments described herein are merely illustrative and do not limit the scope of the invention.

[0029] like Figures 1-3 As shown in the figure, this invention discloses an oil-storing ceramic bearing ring with a multi-scale nested texture, comprising a surface nested texture with graded oil control function and a ceramic substrate. The surface nested texture consists of a primary hexagonal honeycomb oil reservoir and secondary oriented nano-stripes nested on its inner surface. The primary hexagonal honeycomb oil reservoir forms interconnected hexagonal sidewalls through dense arrangement, constituting an isotropic compression grid frame to improve the structural stability and load-bearing capacity of the ring surface; the recessed spaces of the primary hexagonal honeycomb oil reservoir form an oil storage volume, used to physically retain lubricating oil under high-speed rotation conditions to counteract lubricating oil loss driven by centrifugal force.

[0030] The secondary directional nanostripes are laser-induced periodic structures distributed on the bottom and inner wall surfaces of the hexagonal honeycomb oil storage cellar, forming a functional surface with capillary adhesion. The texture direction of the secondary directional nanostripes points towards the center of the contact trajectory of the channel. Through capillary action, the secondary directional nanostripes exert a directional transport force towards the center of the contact trajectory on the lubricating oil in the primary hexagonal honeycomb oil storage cellar. The recessed volume of the primary micron-level honeycomb oil storage cellar and the capillary transport of the secondary nano-level directional stripes together constitute a graded lubricating oil management system for storage, locking, and directional replenishment.

[0031] The overall spatial position of the secondary nanoscale oriented stripes is lower than the top surface of the common wall. There is a height difference between the secondary nanoscale oriented stripes and the top surface of the common wall in a direction perpendicular to the surface of the groove. The height difference forms a physical wear protection structure for the secondary nanoscale oriented stripes, so that the secondary nanoscale oriented stripes do not participate in the direct contact friction between the rolling elements and the groove during the operation of the bearing.

[0032] This invention employs a vertical superposition of micron and nano structures, which are functionally interdependent. The micron oil storage cell provides housing space and a protective barrier for the nano stripes, while the nano stripes endow the micron oil storage cell with active oil transport capability. The two form a synergistic relationship of spatial nesting and functional coupling.

[0033] Furthermore, the common wall top surface between the primary hexagonal honeycomb oil reservoirs is a flat, textureless plane, used to form a smooth geometric contact interface with the rolling elements during bearing operation. The secondary directional nanostripes are completely housed within the recessed space of the primary hexagonal honeycomb oil reservoirs, forming a spatial height difference with the common wall top surface to protect the nanostripes from direct shear wear by the rolling elements. The orientation of the secondary directional nanostripes is controlled by a laser polarization vector, with its texture vector pointing towards the center of the contact trajectory of the raceway groove. Under high-speed rotation conditions, the nanostripes utilize capillary adhesion to lock the lubricating oil onto the inner wall and guide the lubricating oil to the friction interface for directional replenishment.

[0034] Furthermore, the diameter of each individual unit of the primary hexagonal honeycomb oil storage cell is 60-100 μm and the depth is 15-25 μm; the width of the common wall between two adjacent oil storage cells is 10-20 μm; and the period of the secondary directional nano-stripes is 400-800 nm and the depth is 100-300 nm.

[0035] Furthermore, the orientation of the secondary directional nanostripes is controlled by a laser polarization vector, with the texture vector pointing towards the center of the contact trajectory of the groove. The angle between the orientation of the secondary directional nanostripes and the circumferential vector of the groove is 5°-15°, forming oil guiding channels converging towards the center on both sides of the contact trajectory center. Setting the angle between the stripe orientation and the circumferential vector of the groove to 5°-15° ensures that the stripes have a directional component pointing towards the contact center, while avoiding an excessively large angle that would cause the oil to flow along the stripes to be too long, thus reducing the replenishment efficiency. When the angle is less than 5°, the directional transport effect is not obvious; when it is greater than 15°, the fluid resistance increases significantly.

[0036] Furthermore, the ceramic matrix is ​​selected from any one of silicon nitride, zirconium oxide, or silicon carbide ceramics.

[0037] This invention also discloses a method for processing an oil-retaining ceramic bearing ring with a multi-scale nested texture, comprising the following steps: Step 1: Grind and polish the grooves of the ceramic ring to obtain an arc-shaped base with a preset roughness, and then perform ultrasonic cleaning. Step 2: A femtosecond laser beam is used to perform a preset honeycomb path scan. By adjusting the energy flux density gradient distribution within the laser spot, a micron-sized oil reservoir is formed at the center of the spot through ablation. Simultaneously, the low-energy induction zone at the edge of the spot induces the formation of secondary directional nanostripes on the inner surface of the reservoir. The primary micron-sized honeycomb oil reservoir and the secondary nano-sized directional stripes are integrally formed in the same laser scanning process, without the need for step-by-step processing or equipment replacement. The integrated processing strategy of ablation and induction relies on the energy flux density difference between the central and edge regions within the same femtosecond laser pulse spot. The high energy flux at the center of the spot achieves ablation and formation, while the low energy flux at the edge of the spot induces the generation of nanostripes, ensuring the spatial positional accuracy and morphological continuity between the nanostripes and the inner wall of the micron-sized oil reservoir.

[0038] Step 3: Cleaning removes physical splashes to obtain a lubricated surface with micro-nano composite features.

[0039] Furthermore, in step 2, the femtosecond laser pulse width is 200-500 fs, and the spot overlap rate is 50%-80%. The direction of the nanostripes is controlled by adjusting the laser polarization vector, so that they point towards the center of the channel contact trajectory.

[0040] Thirdly, the present invention also discloses the application of an oil-storage ceramic bearing ring with a multi-scale nested texture in high-speed bearing lubrication replenishment.

[0041] Specifically, under high-speed bearing operation, the primary hexagonal honeycomb oil reservoir physically stores lubricating oil through its concave volume to counteract centrifugal oil spillage. The secondary directional nanofibers utilize capillary adhesion to lock the lubricating oil onto the inner wall and guide it to be directionally replenished along the sidewalls towards the friction interface. The multi-scale hierarchical synergy between the primary hexagonal honeycomb oil reservoir and the secondary directional nanofibers enhances the dynamic stability of the oil film. The physical constraint of the primary micron-level honeycomb oil reservoir and the capillary transport function of the secondary nanofibers form a spatially nested functional coupling: the oil storage function, capillary locking function, and active replenishment function are spatially integrated within the same multi-scale nested structure and act synchronously on the lubricating oil in time to maintain the stability of the dynamic oil film in the contact area under ultra-high-speed conditions.

[0042] Example 1 This embodiment takes the inner ring 2 of a silicon nitride ceramic ball bearing as an example. The ring has an arc-shaped groove 1 for supporting the rolling elements.

[0043] First, the ceramic ring groove 1 is precision ground and polished to make the surface roughness of the arc base meet the preset requirements. Then, anhydrous ethanol is used for ultrasonic cleaning to remove impurities and oil stains from the groove surface.

[0044] In the specific preparation process, the cleaned ceramic inner ring 2 is clamped on a five-axis linkage laser processing platform, and a femtosecond laser beam with a pulse width of 290 fs is used to perform a preset honeycomb path scan on the channel surface 1. Before processing, a multi-point touch test is performed on the channel arc surface using a contact probe to establish a three-dimensional mathematical model of the channel arc surface. During the scanning process, the control system calculates the motion parameters of each axis in real time according to the mathematical model to ensure that the direction of the laser beam optical axis is always consistent with the normal at the processing point of the channel surface, and the laser focus is always located on the processing surface. By precisely adjusting the energy flux density in the laser spot to a gradient distribution, the high-energy region at the center of the spot is ablated and stripped, thereby forming a first-order hexagonal honeycomb oil reservoir 4 with a single unit diameter of 80 μm and a depth of 20 μm on the ceramic substrate. The common wall 5 between two adjacent oil reservoirs has a width of 15 μm. Simultaneously, utilizing the characteristic that the energy flux density at the edge of the laser spot is lower than the ablation threshold, circumferentially arranged secondary oriented nanostripes 6 are simultaneously induced on the bottom and sidewall surfaces of the pit. The stripe period is set to 600 nm, and the depth to 200 nm. During scanning, the laser polarization vector is programmed to ensure that the direction of the nanostripes always maintains a 10° angle with the circumferential vector 3 of the channel, thereby constructing a figure-eight-shaped oil guiding channel converging towards the center on both sides of the channel contact trajectory center. Furthermore, the overlap rate of the laser spot is controlled at 75% to ensure the integrated forming quality of the micron-level grid framework and the nanoscale texture.

[0045] After processing, ultrasonic cleaning is performed again to remove residual physical splashes. At this point, the primary hexagonal honeycomb oil reservoir 4 forms an interconnected pressure grid through dense arrangement, with its common wall 5 having a flat and textureless top surface, serving as the geometric interface in direct contact with the rolling elements. Since the secondary directional nano-stripes 6 are completely residing within the 20 μm deep reservoir space, the height difference between them and the top surface of the common wall effectively protects the nano-textures from premature wear. Under high-speed bearing rotation conditions, the primary hexagonal honeycomb oil reservoir 4 utilizes its concave volume to physically trap lubricating oil to counteract centrifugal oil spillage; the secondary directional nano-stripes 6 utilize capillary adsorption to lock the lubricating oil onto the inner wall and guide the lubricating oil along the sidewall to directionally replenish the friction interface, thereby maintaining a stable dynamic oil film at the friction interface and significantly improving the service life of the bearing.

[0046] The specific embodiments of the present invention have been described above with reference to the accompanying drawings, but they should not be construed as limiting the scope of the present invention. The scope of protection of the present invention is defined by the appended claims, and any modifications based on the claims of the present invention are within the scope of protection of the present invention.

Claims

1. An oil-retaining ceramic bearing ring with a multi-scale nested texture, characterized in that: It includes a surface-nested textured structure with graded oil control function and a ceramic substrate; the surface-nested textured structure consists of a primary hexagonal honeycomb oil storage cell and secondary oriented nano-stripes nested on its inner surface; the primary hexagonal honeycomb oil storage cell forms interconnected hexagonal sidewalls through dense arrangement, constituting an isotropically compressed grid frame; the secondary oriented nano-stripes are laser-induced periodic structures distributed on the bottom and inner sidewall surfaces of the hexagonal honeycomb oil storage cell.

2. The oil-retaining ceramic bearing ring with multi-scale nested texture according to claim 1, characterized in that, The common top surface of the wall between the primary hexagonal honeycomb oil storage cells is a flat, textureless plane, which is used to form a smooth geometric contact interface with the rolling elements during the operation of the bearing. The secondary directional nanostripes are completely housed within the recessed space of the primary hexagonal honeycomb oil storage cellar, forming a spatial height difference with the top surface of the common wall to protect the nanostripes from direct shear wear by the rolling elements.

3. The oil-retaining ceramic bearing ring with multi-scale nested texture according to claim 1, characterized in that, The orientation of the secondary oriented nanostripes is controlled by the laser polarization vector, and the texture vector points to the center of the contact trajectory of the ring groove; the angle between the orientation of the secondary oriented nanostripes and the circumferential vector of the groove is 5°-15°, forming oil guiding channels that converge toward the center on both sides of the center of the groove contact trajectory.

4. The oil-retaining ceramic bearing ring with multi-scale nested texture according to claim 1, characterized in that, The ceramic matrix is ​​selected from any one of silicon nitride, zirconium oxide, or silicon carbide ceramics.

5. A method for processing an oil-retaining ceramic bearing ring with a multi-scale nested texture as described in any one of claims 1 to 4, characterized in that, Includes the following steps: Step 1: Grind and polish the grooves of the ceramic ring to obtain an arc-shaped base with a preset roughness, and then perform ultrasonic cleaning. Step 2: A femtosecond laser beam is used to perform a preset honeycomb path scan on the channel surface. By adjusting the energy flux density gradient distribution within the laser spot, a micron-sized hexagonal honeycomb oil storage cellar is formed at the center of the spot. At the same time, the low energy density induced region at the edge of the spot is used to induce the formation of secondary directional nanostripes on the inner surface of the cellar. Step 3: Clean to remove physical splashes and obtain a lubricated surface with multi-scale nested features.

6. A method for processing an oil-retaining ceramic bearing ring with a multi-scale nested texture according to claim 5, characterized in that, In step 2, the diameter of a single hexagonal honeycomb oil storage cellar is 60-100 μm, the depth is 15-25 μm, and the width of the common wall between two adjacent oil storage cells is 10-20 μm.

7. A method for processing an oil-retaining ceramic bearing ring with a multi-scale nested texture according to claim 5, characterized in that, The size parameters of the secondary oriented nanostripes in step 2 are: stripe period of 400-800 nm and stripe depth of 100-300 nm.

8. A method for processing an oil-retaining ceramic bearing ring with a multi-scale nested texture according to claim 5, characterized in that, In step 2, the pulse width of the femtosecond laser is 200-500 fs; the laser spot overlap rate is 50%-80%.

9. The application of an oil-storage ceramic bearing ring with a multi-scale nested texture as described in claim 1 in high-speed bearing lubrication replenishment.

10. The application according to claim 9, characterized in that, The application is as follows: Under the condition of high-speed operation of bearings, the primary hexagonal honeycomb oil storage cell physically stores the lubricating oil through the concave volume to resist centrifugal oil slinging. The secondary directional nano-stripes use capillary adsorption force to lock the lubricating oil on the inner wall and guide the lubricating oil to be directionally replenished to the friction interface along the side wall. The multi-scale hierarchical synergistic effect of the primary hexagonal honeycomb oil storage cell and the secondary directional nano-stripes improves the dynamic stability of the oil film.

Images