Programmable self-lubricating reservoir medium, method for its production, method for determining structural parameters

Abstract

The application discloses a programmable self-lubricating liquid storage medium and a preparation method and a structure parameter determination method thereof, and belongs to the field of mechanical engineering and material science. The pores in the porous liquid storage layer are single-layer or multi-layer micropores with adjustable pore diameters and porosities, and the microstructure surface layer is micro-nano texture with adjustable structure morphological parameters and distribution states. The pore distribution and structure parameters can be adjusted according to the expected lubricating effect, so that the purposes of controllable pore structure and controllable lubricating effect are achieved. The porous liquid storage medium is prepared by using an additive manufacturing technology, so that the defects that the existing mold pressing forming process cannot meet the preparation requirements of self-lubricating complex components and limits the application range of the porous liquid storage medium are overcome.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of mechanical engineering and material science, in particular to a programmable self-lubricating liquid storage medium and a preparation method and a structure parameter determination method thereof. BACKGROUND

[0002] The porous liquid storage medium has a certain porosity inside for storing lubricating medium, thereby ensuring good self-lubricating performance. Under the stimulation of external load, the lubricating medium can be separated from the pores and form a fluid dynamic pressure lubricating oil film in the gap between the friction pair, and can also spontaneously realize the back absorption of the surface lubricating oil under the driving of the internal capillary force, thereby forming a circulating intelligent lubricating system. However, it is worth noting that the lubricating medium can also penetrate into the porous matrix under the action of the oil film pressure, thereby reducing the thickness of the lubricating oil film and the load-carrying capacity of the oil film, which means that the self-lubricating performance and the load-carrying capacity of the oil film of the porous liquid storage medium are difficult to balance.

[0003] However, good oil lubrication conditions often require a high porosity, and a high porosity will reduce the mechanical properties of the porous liquid storage medium matrix; the premature and excessive penetration of the lubricating medium, or insufficient recovery will also cause the service life of the porous liquid storage medium to decrease. In addition, the current porous liquid storage medium is mostly prepared by a molding process, which is difficult to meet the preparation requirements of self-lubricating complex components, thereby limiting the application range of the porous liquid storage medium. SUMMARY

[0004] The purpose of the present application is to provide a programmable self-lubricating liquid storage medium and a preparation method and a structure parameter determination method thereof, which can realize the regulation of the pore structure and the lubricating effect.

[0005] To achieve the above-mentioned purpose, the present application provides the following solutions:

[0006] A programmable self-lubricating liquid storage medium, comprising: a porous liquid storage layer and a microstructure surface layer;

[0007] The microstructure surface layer is arranged on the porous liquid storage layer;

[0008] The pores in the porous liquid storage layer are single-layer or multi-layer micropores with adjustable pore diameter and porosity; the pores store lubricating medium;

[0009] The microstructure surface layer is a micro-nano texture with adjustable structure morphology parameters and distribution state, and is used for promoting the pumping circulation and fluid dynamic pressure lubrication effect of the lubricating medium.

[0010] A preparation method of a programmable self-lubricating liquid storage medium, comprising:

[0011] Constructing a digital model of the programmable self-lubricating liquid storage medium;

[0012] According to the digital model, a porous liquid storage layer and a microstructure surface layer are sequentially prepared from bottom to top by using an additive manufacturing technology;

[0013] The lubricating medium is introduced into the pores of the porous liquid storage layer by using a vacuum hot dipping process to form a programmable self-lubricating liquid storage medium.

[0014] A structure parameter determination method of a programmable self-lubricating liquid storage medium comprises:

[0015] Based on the Reynolds equation, a fluid motion equation of the programmable self-lubricating liquid storage medium considering the internal pore structure is established;

[0016] The fluid motion equation is dimensionless processed to obtain a dimensionless Reynolds equation;

[0017] According to the desired lubrication effect, a plurality of groups of structure parameters are preset; the structure parameters include a pore diameter of the porous liquid storage layer, a porosity of the porous liquid storage layer, a pore diameter of the microstructure surface layer, a pore depth of the microstructure surface layer, and a porous layer thickness of the microstructure surface layer;

[0018] According to each group of structure parameters, the dimensionless Reynolds equation is discretely iterated by using a finite difference method to obtain a surface fluid lift distribution of the programmable self-lubricating liquid storage medium corresponding to each group of structure parameters;

[0019] The surface fluid lift distribution of the programmable self-lubricating liquid storage medium corresponding to each group of structure parameters is compared with a surface fluid lift distribution corresponding to the desired lubrication effect to determine an optimal group of structure parameters as the structure parameters of the programmable self-lubricating liquid storage medium.

[0020] According to the specific embodiments provided by the present application, the following technical effects are disclosed:

[0021] The present application discloses a programmable self-lubricating liquid storage medium, a preparation method thereof, and a structure parameter determination method thereof; the pores in the porous liquid storage layer are single-layer or multi-layer micropores with adjustable pore diameters and porosities, and the microstructure surface layer is a micro-nano texture with adjustable structure morphological parameters and distribution states; the pore distribution and structure parameters can be adjusted according to the desired lubrication effect, so as to achieve the purposes of controllable pore structure and controllable lubrication effect.

[0022] In the preparation method of the programmable self-lubricating liquid storage medium, the additive manufacturing technology is used to prepare the porous liquid storage medium, which overcomes the defects that the existing mold pressing process cannot meet the preparation requirements of self-lubricating complex components and limits the application range of the porous liquid storage medium. BRIEF DESCRIPTION OF DRAWINGS

[0023] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed in the embodiments. Obviously, the drawings described below only constitute some of the embodiments of the present application, and for those skilled in the art, other drawings can also be obtained from these drawings without creative labor.

[0024] Figure 1 A structure schematic diagram of a programmable self-lubricating liquid storage medium provided for Embodiment 1 of the present application;

[0025] Figure 2 A flow chart of a preparation method of a programmable self-lubricating liquid storage medium provided for Embodiment 2 of the present application;

[0026] Figure 3 A flow chart of a structure parameter determination method of a programmable self-lubricating liquid storage medium provided for Embodiment 3 of the present application;

[0027] Figure 4 A cross-section optical micrograph provided for Embodiment 4 of the present application;

[0028] Figure 5 SEM diagrams of two samples provided for Embodiment 4 of the present application; Figure 5 (a) in FIG. 1 is a SEM diagram of one sample, Figure 5 (b) in FIG. 1 is a SEM diagram of another sample;

[0029] Figure 6 Surface lubrication lift distribution schematic diagrams of two samples provided for Embodiment 4 of the present application;

[0030] Figure 7 Friction coefficient distribution schematic diagrams of different surface microstructure samples provided for Embodiment 4 of the present application;

[0031] Figure 8 A lubrication mechanism schematic diagram of a programmable self-lubricating liquid storage medium provided for Embodiment 4 of the present application. DETAILED DESCRIPTION

[0032] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments only constitute some of the embodiments of the present application, and for those skilled in the art, all other embodiments obtained based on the embodiments in the present application without creative labor are within the protection scope of the present application.

[0033] The purpose of the present application is to provide a programmable self-lubricating liquid storage medium and a preparation method and a structure parameter determination method thereof, which can realize the regulation of pore structure and lubrication effect.

[0034] In order to make the above objectives, characteristics and advantages of the present application more obvious and easy to understand, the present application will be further described in detail below with reference to the drawings and specific embodiments.

[0035] Embodiment 1

[0036] As shown in Figure 1 , the embodiment of the present application provides a programmable self-lubricating liquid storage medium, which comprises a porous liquid storage layer and a microstructure surface layer. The microstructure surface layer is arranged on the porous liquid storage layer. The pores in the porous liquid storage layer are single-layer or multi-layer micropores with adjustable pore diameter and porosity, and the pores store lubricating medium. The microstructure surface layer is micro-nano texture with adjustable structure morphological parameters and distribution state, and the microstructure surface layer is used to promote the pumping circulation of the lubricating medium and the hydrodynamic lubrication effect.

[0037] The programmable self-lubricating liquid storage medium further comprises a bottom layer. The bottom layer is arranged below the porous liquid storage layer. The bottom layer is used to prevent leakage of the lubricating medium.

[0038] The porous liquid storage layer corresponds to the B layer (the oil-containing porous layer inside the porous liquid storage medium) in Figure 1 , the microstructure surface layer corresponds to the A layer (the structure layer on the surface of the porous liquid storage medium) in Figure 1 , and the bottom layer corresponds to the C layer (the bottom layer of the porous liquid storage medium) in Figure 1 .

[0039] The porous liquid storage layer and the microstructure surface layer can be prepared by using the same series / different series of materials, but can be formed at one time.

[0040] In one example, the micropores of the porous liquid storage layer are multi-layer micropores, and specifically preferably a structure composite of single-layer or double-layer micropores with different porosities and pore diameters. The diameter of the micropores in the porous liquid storage layer ranges from 1 μm to 500 μm, and the porosity is less than 30%.

[0041] The microstructure surface layer can be directly formed on the inner micropore structure by using an additive manufacturing technology. The structure parameters of the microstructure surface layer are subject to a design method, which is beneficial to promoting the hydrodynamic lubrication effect.

[0042] The programmable self-lubricating liquid storage medium provided by the present application has the characteristics of adjustable pore structure and controllable lubricating effect, and the form of the porous liquid storage medium can be designed as needed.

[0043] The programmable self-lubricating liquid storage medium provided by the present application is specifically used for preparing core equipment parts in engineering machinery which are difficult to supply oil and inconvenient to lubricate. The programmable self-lubricating liquid storage medium has the characteristics of low friction coefficient, fixed-point oil supply and controllable lubricating performance, and has a simple preparation process, a wide range of materials and a wide application prospect in the field of mechanical engineering.

[0044] Embodiment 2

[0045] The embodiment of the present application provides a preparation method of programmable self-lubricating liquid storage medium, as shown in the formula, comprising: Figure 2

[0046] Step S1, constructing a digital model of the programmable self-lubricating liquid storage medium.

[0047] The digital model of the programmable self-lubricating liquid storage medium is directly constructed through CAD software, and the overall structure form and the morphology and distribution state of the surface microstructure can be designed as required.

[0048] Step S2, according to the digital model, a porous liquid storage layer and a microstructure surface layer are sequentially prepared from bottom to top by using an additive manufacturing technology.

[0049] The additive manufacturing technology can be one of the following: melting deposition, photocuring, and ink direct writing, that is, the additive manufacturing technology can be one of the following: photocuring 3D printing, melting deposition 3D printing, and direct writing 3D printing. In the preparation process, a material containing a pore-forming agent component is first selected to prepare the inner layer pore structure, and then a material not containing a pore-forming agent component is selected to prepare the surface layer structure. Therefore, the raw material used for preparing the self-lubricating liquid storage medium needs to meet the requirements of one or more of the following: photocuring 3D printing, melting deposition 3D printing, and direct writing 3D printing, and in addition, there is no special requirement for the type of base material.

[0050] The raw material used in the preparation of the porous liquid storage layer contains the same or different content of the pore-forming agent; the content of the pore-forming agent in the raw material is less than 40wt%.

[0051] The material used in the preparation of the microstructure surface layer does not contain a pore-forming agent component.

[0052] Step S3, a vacuum hot-impregnation process is used to introduce a lubricating medium into the pores of the porous liquid storage layer to form the programmable self-lubricating liquid storage medium.

[0053] The vacuum degree of the vacuum hot-impregnation process is less than -75kPa, the impregnation temperature is 25℃-90℃, and the impregnation time is 2h-72h. In one example, the vacuum hot-impregnation process is specifically preferred to have a vacuum degree of -80kPa, an impregnation temperature of 40℃, and an impregnation time of 72h.

[0054] The lubricating medium preferably includes one or more of the following: perfluoropolyether, liquid paraffin, dimethyl silicone oil, and poly-alpha-olefin, and in the embodiment of the present application, the lubricating medium is specifically preferred to be dimethyl silicone oil.

[0055] The prepared programmable self-lubricating liquid storage medium needs to be treated to remove the pore-forming agent, and the pore-forming agent can be removed by water washing or high-temperature treatment, the water washing time is 0h-72h, the high-temperature treatment temperature is 30℃-300℃, and the high-temperature treatment time is 0h-72h. ​

[0056] Embodiment 3

[0057] The embodiment of the present application provides a structural parameter determination method of programmable self-lubricating liquid storage medium, as shown in the formula (I): Figure 3 The embodiment of the present application provides a structural parameter determination method of programmable self-lubricating liquid storage medium, as shown in the formula (I):

[0058] Step 1: based on the Reynolds equation, the fluid motion equation of the programmable self-lubricating liquid storage medium considering the internal pore structure is established.

[0059] The fluid motion equation is as shown in the formula (II):

[0060]

[0061] In the formula, h is a fluid gap, T is a porous layer thickness, p is a fluid pressure, η is a fluid motion viscosity, U is a friction pair moving speed, (x, y) is a coordinate of an arbitrary point between two friction pair surfaces, k p is a dynamic permeability;

[0062]

[0063] In the formula, φ0 is a porosity of a porous liquid storage layer, ε v is a strain, Δp is a pressure difference, Ks is an empirical parameter, and D is an average radius of a skeleton.

[0064] The derivation process of the dynamic permeability k p is as follows:

[0065] It is assumed that an initial solid skeleton volume of the porous liquid storage medium is V s , a dynamic change volume thereof is ΔV s , an initial characterization volume of the porous liquid storage medium is V b , a dynamic change thereof is ΔV b , an initial pore volume of the porous liquid storage medium is V p , a dynamic change volume thereof is ΔV p , an initial porosity of the porous liquid storage medium is φ0, and the porous liquid storage medium is isotropic. According to the definition of the porosity, the following formula (III) is obtained:

[0066]

[0067]

[0068]

[0069]

[0070] Considering that the solid skeleton is elastically deformed, the volume change of the solid skeleton caused by the external pressure is as follows:

[0071] ΔV s / Vs = - Δp / K s (5)

[0072] Substituting equation 5 into equation 4, we have:

[0073]

[0074]

[0075] where φ is the dynamic porosity, φ0 is the initial porosity, E is the elastic compression modulus of the solid skeleton material, ε v is the strain, v is the Poisson's ratio; K s is the particle bulk modulus, which is calculated by equation (7).

[0076] Permeability refers to the ability of the solid structure to allow fluid to pass under a certain pressure difference, which directly determines the medium pumping circulation behavior of the porous liquid storage medium. In fact, the change of porosity will lead to the change of pore structure, and thus often also cause the change of permeability. The existing research commonly used to describe the pore structure and fluid pressure change is the pore model, mainly including Kozeny-Carman equation and Imay equation. Kozeny-Carman equation, also known as sphere equation, is widely used in fluid dynamics calculation under laminar flow state. According to Kozeny-Carman equation, we have:

[0077]

[0078] where φ is the porosity, D is the average radius of the skeleton, K is the empirical parameter, generally 5; considering the dynamic porosity, we have:

[0079]

[0080] Step 2: Dimensionless treatment of the fluid motion equation to obtain the dimensionless Reynolds equation.

[0081] Specifically, it includes:

[0082] The film thickness between any points of the two friction pairs is constructed as where H is the film thickness of any point (x, y) between the two friction pair surfaces, h p is the pore depth of the microstructure surface layer, h0 is the initial gap of the friction pair, Δ is a specific region, (X, Y) is the dimensionless (x, y);

[0083] The dimensionless parameter is defined as where L is the unit area length, p0 is the atmospheric pressure, and ψ is the intermediate function.

[0084] The fluid motion equation is dimensionless processed according to the defined dimensionless parameter, and a dimensionless Reynolds equation is obtained In the formula, ∧ is an intermediate function, ∧ = (6 * u * η' * L) / (p0 * h0 2 ), η' is the viscosity of the lubricant, and u is the relative sliding speed of the friction pair.

[0085] Step 3: According to the desired lubrication effect, a plurality of groups of structure parameters are preset; the structure parameters include the pore diameter of the porous liquid storage layer, the porosity of the porous liquid storage layer, the pore diameter of the microstructure surface layer, the pore depth of the microstructure surface layer, and the thickness of the porous layer of the microstructure surface layer.

[0086] Step 4: According to each group of structure parameters, the dimensionless Reynolds equation is discretely iterated by using the finite difference method, and the surface fluid lifting force distribution corresponding to each group of structure parameters is obtained.

[0087] Step 5: The surface fluid lifting force distribution corresponding to each group of structure parameters is compared with the surface fluid lifting force distribution corresponding to the desired lubrication effect, and the optimal group of structure parameters is determined as the structure parameters of the programmable self-lubricating liquid storage medium.

[0088] Example 4

[0089] The basic ink (BTHT) formula used in this embodiment is shown in Table 1. The preparation raw materials of the programmable self-lubricating liquid storage medium are shown in Table 2, wherein deionized water is used as a porogen in this embodiment, and a light-cured 3D printing technology is used to complete sample preparation from bottom to top, and a model schematic diagram is shown in Figure 1 The ink formula at different printing stages is shown in Table 3. After the model is printed, the sample is taken out, ultrasonically cleaned with ethanol for 10.00 min, and then placed under a UV lamp for curing treatment for 15.00 min. After complete curing, a 3D printed porous liquid storage medium preform sample is obtained. The preformed porous liquid storage medium sample is placed in an oven to remove moisture, and the temperature is 100°C. The entire post-processing process lasts for 48 hours. Dimethyl silicone oil is used as a lubricating medium, and the porous liquid storage medium sample after heat treatment is immersed in a vacuum container filled with dimethyl silicone oil, and the immersion environment temperature is maintained at 40.00°C, and a vacuum environment of-80.00kPa is maintained for 72.00h, so that the internal pores of the porous liquid storage medium are infiltrated with dimethyl silicone oil.

[0090] The prepared cross-sectional optical photographs and SEM photographs of the programmable self-lubricating liquid storage medium are shown in Figure 4 , Figure 5 The basic properties of different samples are shown in Table 4. According to the calculation method, the surface lubrication lifting force distribution of different surface microstructures and internal pore structure samples is shown in Figure 6The friction coefficient distribution of samples with different surface microstructures is shown in FIG. 3, based on the preparation method of Example 3. Figure 7

[0091] The lubrication mechanism of the programmable self-lubricating liquid storage medium is shown in FIG. 4. Figure 8 As shown in FIG. 4, under the action of external load, the pores of the porous liquid storage medium are deformed, and the lubricating medium is extruded and seeped from the internal oil-containing layer to the surface microstructure layer; with the movement of the friction pair, the lubricating medium spreads into a film on the surface of the porous liquid storage medium, and generates a hydrodynamic pressure lubrication effect under the induction of the surface microstructure; the distribution of the surface microstructure is controllable, thereby realizing programmable control of the self-lubricating effect of the liquid storage medium; when the porous liquid storage medium is not subjected to external load, the pores of the inner layer of the porous liquid storage medium expand, and the lubricating medium on the surface of the friction pair flows back and penetrates into the internal pores for storage. Figure 8 In FIG. 4, Surface microstructure layer represents the microstructure surface layer, Internal porous oil-containing layer represents the porous liquid storage layer, Origin no load represents the origin no load; Loading represents additional, Friction pair represents the friction pair, Extrusion represents extrusion, Deformed with load represents load deformation; Lubricating medium represents the lubricating medium, Porous framework represents the porous framework, Surface microstructure represents the surface microstructure; Squeeze effective represents the extrusion effective, Pumping represents pumping; Seepage represents seepage, Recovery without load represents no load recovery, Rubbing with load represents load friction.

[0092] Table 1 Basic ink (BTHT) formula

[0093]

[0094]

[0095] Table 2 Light-cured ink formula

[0096] Number BTHT (wt%) Deionized water (wt%) L-0 100.00 0.00 L-18 82.00 18.00 L-28 72.00 28.00

[0097] Table 3 Ink formula of different samples

[0098] Number Layer A Layer B Layer C Comparative Example 1 L-0 L-0 L-0 Example 1 L-18 L-18 L-18 Example 2 L-28 L-28 L-28 Example 3 L-0 L-28 L-0

[0099] Table 4 Basic performance of different samples ​

[0100] Number Friction coefficient Porosity Oil content Oil retention Comparative Example 1 0.122 0％ 0％ - Example 1 0.108 13.5％ 8.37％ 90.45％ Example 2 0.0943 21.0％ 17.01％ 88.12％

[0101] The beneficial effects of the present application are as follows:

[0102] (1) The microstructure surface layer pores of the programmable self-lubricating liquid storage medium can be designed as needed, which can promote the fluid dynamic pressure lubrication effect; it can better precipitate and recycle the lubricating medium, and also realize on-demand point lubrication, avoiding waste of lubricating medium;

[0103] (2) The porous liquid storage layer pore structure parameters of the programmable self-lubricating liquid storage medium can be dynamically regulated, and the combination of different pore structure parameters can form a gradient structure, which can ensure the oil content rate while avoiding excessive loss of mechanical properties;

[0104] (3) The programmable self-lubricating liquid storage medium can regulate the pore distribution and structure parameters according to the requirements of interfacial lubrication effect, and can realize the integrated forming of complex shape oil-containing self-lubricating devices according to the requirements of service environment and morphological characteristics.

[0105] (4) The porous liquid storage layer and the microstructure surface layer of the programmable self-lubricating liquid storage medium can be prepared by using the same series or different series of materials; the surface layer can be made of materials with high hardness to reduce wear, and the inner layer can be made of materials with small Young's modulus to facilitate the precipitation of lubricating medium.

[0106] Each embodiment in the specification is described in a progressive manner, and each embodiment focuses on the difference from other embodiments. The same or similar parts between each embodiment can be referred to each other. For the system disclosed in the embodiment, since it corresponds to the method disclosed in the embodiment, the description is relatively simple, and the related parts can be referred to the method part.

[0107] In this paper, specific examples are used to illustrate the principles and implementation methods of the present application. The above embodiment description is only used to help understand the method and core idea of the present application; at the same time, for those skilled in the art, according to the idea of the present application, the specific implementation method and application range will be changed. In summary, the content of the specification should not be understood as a limitation of the present application.

Claims

1. A programmable self-lubricating reservoir medium, characterized by, The programmable self-lubricating liquid storage medium is integrally formed, comprising: a porous liquid storage layer and a microstructure surface layer; The microstructure surface layer is arranged on the porous liquid storage layer; The pores in the porous liquid storage layer are single-layer or multi-layer micropores with adjustable pore diameter and porosity; the pores store lubricating medium; deionized water is used as a porogen; The microstructure surface layer is a micro-nano texture with adjustable structure morphological parameters and distribution state, and is used to promote the pumping circulation of the lubricating medium and the hydrodynamic lubrication effect; When the porous liquid storage medium is not subjected to external load, the inner pores of the porous liquid storage medium expand, and the lubricating medium on the surface of the friction pair flows back and seeps into the internal pores for storage; According to the desired lubrication effect, the pore distribution and structure parameters are adjusted.

2. The programmable self-lubricating reservoir medium of claim 1, wherein, Further comprising: a bottom layer; The bottom layer is arranged below the porous liquid storage layer; The bottom layer is used to prevent leakage of the lubricating medium.

3. The programmable self-lubricating reservoir medium of claim 1, wherein, The diameter of the pores in the porous liquid storage layer ranges from 1 μm to 500 μm, and the porosity is less than 30%.

4. A method for the preparation of a programmable self-lubricating reservoir medium according to any one of claims 1 to 3, characterized in that, Comprising: constructing a digital model of the programmable self-lubricating liquid storage medium; According to the digital model, the porous liquid storage layer and the microstructure surface layer are sequentially prepared from bottom to top by using an additive manufacturing technology; The lubricating medium is introduced into the pores of the porous liquid storage layer by using a vacuum hot dipping process to form the programmable self-lubricating liquid storage medium.

5. The method of claim 4, wherein the programmable self-lubricating reservoir medium is prepared by the steps of: The raw materials used in the preparation of the porous liquid storage layer contain the same or different amounts of pore-forming agents; the content of the pore-forming agent in the raw materials is less than 40wt%; Materials without pore-forming agent components are used in the preparation of the microstructure surface layer.

6. The method of claim 5, wherein the programmable self-lubricating reservoir medium is prepared by, The lubricating medium is introduced into the pores of the porous liquid storage layer by using a vacuum hot dipping process to form the programmable self-lubricating liquid storage medium, and then further comprising: The pore-forming agent is removed by water washing or high temperature; the water washing time is 0h-72h, and the high temperature removal temperature is 30℃-300℃.

7. The method of claim 4, wherein the programmable self-lubricating reservoir medium is prepared by the steps of: The vacuum degree of the vacuum hot dipping process is less than -75kPa, the dipping temperature is 25℃-90℃, and the dipping time is 2h-72h.

8. A method of determining the structural parameters of a programmable self-lubricating reservoir medium, characterized in that, Comprising: Based on the Reynolds equation, a fluid motion equation of the programmable self-lubricating liquid storage medium considering the internal pore structure is established; The fluid motion equation is: where h is the fluid gap, T is the porous layer thickness, p is the fluid pressure, η is the fluid motion viscosity, U is the moving speed of the friction pair, (x, y) is the coordinates of any point between the two friction pair surfaces, k p is the dynamic permeability; where φ0 is the porosity of the porous reservoir, ε v is the strain, Δp is the pressure difference, Ks is an empirical parameter, and D is the average radius of the skeleton. The fluid motion equation is dimensionless processed to obtain a dimensionless Reynolds equation; According to the desired lubrication effect, a plurality of groups of structure parameters are preset; the structure parameters include the pore diameter of the porous liquid storage layer, the porosity of the porous liquid storage layer, the pore diameter of the microstructure surface layer, the pore depth of the microstructure surface layer, and the porous layer thickness of the microstructure surface layer; According to each group of structure parameters, the dimensionless Reynolds equation is discretely iterated by using the finite difference method to obtain the surface fluid lift distribution of the programmable self-lubricating liquid storage medium corresponding to each group of structure parameters; The surface fluid lift distribution of the programmable self-lubricating liquid storage medium corresponding to each group of structure parameters is compared with the surface fluid lift distribution corresponding to the desired lubrication effect to determine the optimal group of structure parameters as the structure parameters of the programmable self-lubricating liquid storage medium.

9. The method of determining the structural parameters of a programmable self- lubricating reservoir medium according to claim 8, characterized in that, The fluid motion equation is dimensionless processed to obtain a dimensionless Reynolds equation, specifically comprising: The film thickness of any point between the two friction pair surfaces is constructed as where H is the film thickness of any point (x, y) between the two friction pair surfaces, h p is the pore depth of the microstructure surface layer, h0 is the initial gap of the friction pair, Δ is a specific area, and (X, Y) is the dimensionless (x, y). Defining a dimensionless parameter where L is the length of the unit area, p0is the atmospheric pressure, and ψ is an intermediate function. According to the defined dimensionless parameter, the fluid motion equation is dimensionless processed to obtain a dimensionless Reynolds equation In the formula, ∧ is an intermediate function, ∧ = (6 * u * η' * L) / (p0 * h0 2 ), η' is lubricant viscosity, and u is relative sliding speed of the friction pair.

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