CN115679247A - A preparation method of low-friction and wear-resistant composite coating containing boronizing layer and textured surface - Google Patents

Abstract

The invention discloses a preparation method of a low-friction wear-resistant composite coating containing a boronizing layer and a texture surface, which comprises the following steps: carrying out boronizing strengthening treatment, preparing a boronizing strengthening layer on the surface of a workpiece, and then removing residues on the surface of the workpiece after the boronizing treatment; step (2), carrying out surface texturing treatment on the workpiece subjected to boronizing treatment to form pits on the surface of the workpiece; and (3) coating the two-dimensional material dispersion liquid on the surface of the workpiece, drying, and repeating the coating and drying operation until a solid self-lubricating coating based on the boronizing strengthening layer and the textured surface is obtained. The solid lubricating layer is made of a two-dimensional material, and the wear-resistant and friction-reducing capability of the two-dimensional material is fully exerted depending on the adhesion effect of the boronizing strengthening layer and the storage effect of the textured surface, so that the lubricating behavior of long service life and low friction and wear is realized.

Description

A preparation method of low-friction and wear-resistant composite coating containing boronizing layer and textured surface

technical field

The invention belongs to the technical field of solid lubricating coatings and materials, in particular to a method for preparing a low-friction and wear-resistant composite coating containing a boronized layer and a textured surface.

Background technique

According to reports, the energy loss caused by friction and wear accounts for 1/3 of the global energy loss every year, and the failure of mechanical equipment and parts caused by excessive friction can reach 80% of the total, and the serious accidents of mechanical equipment caused by it exceed 50%. Reducing friction and wear, improving the service life of mechanical components and reducing energy consumption have become problems that need to be solved urgently in the current world. However, with the rapid development of my country's industry and cutting-edge technology, high-end manufacturing such as aviation, aerospace, navigation, and high-speed rail is moving towards "higher, deeper, faster, and safer". Application requirements under extreme environmental conditions such as high temperature and high pressure.

As another important form of lubrication, solid lubrication has the advantages of high load capacity, high wear resistance, low friction and excellent environmental adaptability, and is widely used in space environment, aviation industry and advanced energy equipment and other fields. In recent years, technologies related to solid lubricating coatings have received extensive attention from researchers. CN110064575A discloses a two-dimensional material solid lubricating film and its preparation method. The two-dimensional material dispersion is coated on the surface of the workpiece, and the adhesion is improved by hot pressing, thermal annealing, etc. to prepare a film with high stability and good friction performance. solid lubricating film. CN114000106A discloses a low-friction molybdenum disulfide-based composite solid lubricating coating and a preparation method thereof. A low-friction, wear-resistant MoS2 _- based composite coating is prepared on the surface of a workpiece by magnetron sputtering. However, solid lubricating coating technologies generally have disadvantages such as complex preparation process, harsh preparation conditions, high production cost, poor bonding performance with the substrate, and short service life, which severely limit their research and application.

Contents of the invention

In order to solve the technical problems raised in the above-mentioned background technology, the present invention proposes a method for preparing a low-friction and wear-resistant composite coating containing a boronizing layer and a textured surface. The composite coating involves a boronizing strengthening layer, textured Surface and solid lubricating layer, the solid coating prepared by this method not only has good bonding performance, high stability, long service life and excellent lubricating performance, but also has controllable coating thickness, simple preparation process, low cost, suitable for The advantages of large-area rapid preparation show good prospects in actual industrial production and application.

Specifically, the present invention provides a method for preparing a low-friction and wear-resistant composite coating containing a boronized layer and a textured surface, comprising the following steps:

Step (1) performing boronizing strengthening treatment, preparing a boronizing strengthening layer on the surface of the workpiece, and then removing the residue on the surface of the workpiece after boriding treatment;

Step (2) performing surface texturing treatment on the workpiece after boriding treatment, so that pits are formed on the surface of the workpiece;

Step (3) Coating the two-dimensional material dispersion on the surface of the workpiece, and performing drying treatment, repeating the coating and drying treatment operations until a solid self-lubricating coating based on a boronizing strengthening layer and a textured surface is obtained. layer.

As a further description of the present invention, the workpiece is one of steel, titanium alloy, and multi-principal alloy.

As a further description of the present invention, the boronizing strengthening treatment in step (1) adopts one of solid boronizing process or molten salt electrolytic boronizing process.

As a further illustration of the present invention, the surface of the workpiece needs to be cleaned before the boronizing strengthening treatment in step (1); and ultrasonic cleaning is used to remove the residues on the surface of the workpiece after boronizing treatment.

As a further illustration of the present invention, the surface texturing treatment in step (2) includes one of embossing processing, abrasive gas jet processing, electrolytic processing, reactive ion etching processing, and laser surface texturing. kind.

As a further illustration of the present invention, the pits formed on the surface of the workpiece in step (2) are micro-cylindrical pits, and the pits have a diameter of 20-300 μm, a depth of 20-500 μm, and an area density of 5% -35%.

As a further description of the present invention, the two-dimensional material in step (3) includes one or more of graphene, graphene oxide, molybdenum disulfide, tungsten disulfide, molybdenum diselenide and hexagonal boron nitride.

As a further description of the present invention, the solvent of the two-dimensional material dispersion in step (3) includes one or more of water, alkylamine, polyethyleneimine, polyacrylic acid, and polyethylene glycol.

As a further description of the present invention, the coating method in step (3) includes one of drop coating, spray coating, spin coating, and electrophoretic deposition.

As a further description of the present invention, the coating and drying operations in step (3) are repeated at least three times.

Compared with the prior art, the present invention has the following beneficial technical effects:

The textured surface of the present invention has a good storage capacity for two-dimensional materials, which can significantly improve the service life of the solid lubricating layer;

In the present invention, the boronizing strengthening layer is metallurgically bonded to the surface of the workpiece, the bonding strength is high, and it is not easy to peel off. It has high hardness, good bearing capacity, excellent wear resistance and strong adhesion, and can The textured surface plays a very good protective role and significantly improves the bonding strength between the workpiece and the solid lubricating layer;

In the present invention, the solid lubricating layer is composed of two-dimensional materials, relying on the adhesion of the boronizing strengthening layer and the storage function of the textured surface, fully exerting the anti-wear and friction-reducing capabilities of the two-dimensional materials, and realizing long life and low friction and wear lubrication behavior;

The preparation process of the solid lubricating layer in the present invention is simple, low in cost, and has no special requirements for equipment, and the solid lubricating technology can be realized in an atmospheric environment, which is suitable for rapid and large-area preparation in industrial applications; and the solid lubricating The preparation process of the layer has a wide range of applications, and can be applied to the surfaces of various steel materials, titanium alloys, zirconium alloys and multi-principal alloys.

Description of drawings

FIG. 1 is an SEM image of a boronizing strengthening layer in Example 1 of the present invention.

Figure 2 is an optical picture of the textured surface in Example 1 of the present invention.

Fig. 3 is the friction test result of the solid lubricating layer prepared in Example 1 of the present invention.

Fig. 4 is the friction test result of the solid lubricating layer prepared in Example 2 of the present invention.

Fig. 5 is the friction test result of the solid lubricating layer prepared in Comparative Example 1.

Fig. 6 is the friction test result of the solid lubricating layer prepared in Comparative Example 2.

Fig. 7 is the friction test result of the solid lubricating layer prepared in Comparative Example 3.

Detailed ways

In order to more clearly understand the above objects, features and advantages of the present invention, the present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be noted that, in the case of no conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other.

Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the technical field of the invention. The terms used herein in the description of the present invention are for the purpose of describing specific embodiments only, and are not intended to limit the present invention.

Example 1:

A method for preparing a low-friction and wear-resistant composite coating containing a boronizing layer and a textured surface, the method comprising the following steps:

S1: Preparation of boronizing strengthening layer - put the bearing steel disk workpiece into a molten salt electrolytic furnace, and keep it warm for 30 min at 900 °C and 20 A to complete the preparation of boronizing strengthening layer; after the workpiece is cooled, put Put it into boiling water to remove the residual molten salt on the surface of the workpiece, then ultrasonically clean the workpiece and dry it in an oven to obtain a bearing steel workpiece with a boronizing strengthening layer. The SEM image of the boronizing strengthening layer is shown in Figure 1 shown.

Wherein, the boronizing method may also be solid boronizing or gas boronizing, and the specific boronizing operation is not limited to the method mentioned in this embodiment.

S2: Preparation of textured surface—Place the 30 mm diameter and 5 mm thick bearing steel disk workpiece with boronizing strengthening layer in S1 on the laser marking machine workbench, and control the laser path through Ezcad software. Micro-cylindrical pit texture is obtained on the surface of the workpiece. The pit diameter is 100 microns, the depth is 120 microns, and the area density is 16%. The workpiece with the textured surface was ultrasonically cleaned and dried in an oven to obtain a clean textured surface. The optical picture of the textured surface is shown in Figure 2.

Among them, the surface texture treatment technology can also be embossing processing technology, abrasive gas jet processing technology, electrolytic processing technology or reactive ion etching processing technology, and the specific surface texturing treatment is not limited to the ones mentioned in this embodiment. The way.

S3: Preparation of two-dimensional material dispersion - add 0.2 g graphene oxide and 0.2 g molybdenum disulfide to the reagent bottle respectively, add deionized water to 100 g, and obtain uniformly dispersed 0.2 wt% graphite oxide under the action of ultrasound Alkene and 0.2wt% molybdenum disulfide mixed two-dimensional material dispersion.

Wherein, the two-dimensional material may also be one or more of graphene, graphene oxide, molybdenum disulfide, tungsten disulfide, molybdenum diselenide and hexagonal boron nitride.

S4: Preparation of solid lubricating layer - use the drop coating method to coat the two-dimensional material dispersion in S3 on the surface of the workpiece in S2, and put it in a drying oven at 60°C for drying treatment; after the drying is completed, repeat the above The operation was performed 5 times to obtain a solid lubricating layer based on a boronizing strengthening layer and a textured surface.

S5: Friction test - put the workpiece treated by the above solid lubrication technology on a multi-functional friction and wear testing machine for friction test, apply a load of 10 N, a line speed of 6 mm/s, and obtain a stable ultra-low temperature at 200 °C. Friction state (cof=0.025), friction test results are shown in Figure 3.

Example 2:

A method for preparing a low-friction and wear-resistant composite coating containing a boronizing layer and a textured surface, the method comprising the following steps:

S1: Preparation of boronizing strengthening layer - put the bearing steel disk workpiece into a molten salt electrolytic furnace, and keep it warm for 30 min at 900 °C and 20 A to complete the preparation of boronizing strengthening layer; after the workpiece is cooled, put It is placed in boiling water to remove residual molten salt on the surface of the workpiece, and then the workpiece is ultrasonically cleaned and dried in an oven to obtain a bearing steel workpiece with a boronizing strengthening layer.

Wherein, the boronizing method may also be solid boronizing or gas boronizing, and the specific boronizing operation is not limited to the method mentioned in this embodiment.

S2: Preparation of textured surface—Place the 30 mm diameter and 5 mm thick bearing steel disk workpiece with boronizing strengthening layer in S1 on the laser marking machine workbench, and control the laser path through Ezcad software. Micro-cylindrical pit texture was obtained on the surface of the workpiece. The pit diameter was 100 μm, the depth was 120 μm, and the area density was 16%. The workpiece with the textured surface is ultrasonically cleaned and then dried in an oven to obtain a workpiece to be coated with a boronizing strengthening layer and a textured surface.

Among them, the surface texture treatment technology can also be embossing processing technology, abrasive gas jet processing technology, electrolytic processing technology or reactive ion etching processing technology, and the specific surface texturing treatment is not limited to the ones mentioned in this embodiment. The way.

S3: Preparation of two-dimensional material dispersion - add 0.2 g graphene oxide and 0.2 g molybdenum disulfide to the reagent bottle respectively, add deionized water to 100 g, and obtain uniformly dispersed 0.2 wt% graphene oxide under the action of ultrasound Mix the two-dimensional material dispersion with 0.2 wt% molybdenum disulfide.

Wherein, the two-dimensional material may also be one or more of graphene, graphene oxide, molybdenum disulfide, tungsten disulfide, molybdenum diselenide and hexagonal boron nitride.

S4: Preparation of solid lubricating layer - use the drop coating method to coat the two-dimensional material dispersion in S3 on the surface of the workpiece in S2, and put it in a drying oven at 60°C for drying treatment; after the drying is completed, repeat the above The operation was performed 5 times to obtain a solid lubricating layer based on a boronizing strengthening layer and a textured surface.

S5: Friction test - put the workpiece treated by the above solid lubrication technology on a multi-functional friction and wear testing machine for friction test, apply a load of 10 N, and a line speed of 6 mm/s. At room temperature, a long-term stable low friction is obtained. state, the friction test results are shown in Fig. 4.

Comparative example 1:

A method for testing the tribological behavior of a composite coating not containing a boronizing layer and a textured surface, the method comprising the following steps:

S1: Preparation of two-dimensional material dispersion - add 0.2 g graphene oxide and 0.2 g molybdenum disulfide to the reagent bottle respectively, add deionized water to 100 g, and obtain uniformly dispersed 0.2 wt% graphene oxide under the action of ultrasound Mix the two-dimensional material dispersion with 0.2 wt% molybdenum disulfide.

Wherein, the two-dimensional material may also be one or more of graphene, graphene oxide, molybdenum disulfide, tungsten disulfide, molybdenum diselenide and hexagonal boron nitride.

S2: Preparation of solid lubricating layer - use the drop coating method to coat the two-dimensional material dispersion in S1 on the surface of the original bearing steel workpiece, and put it in a drying oven at 60°C for drying treatment; after the drying is completed, repeat the above The operation was performed 5 times to obtain a bearing steel workpiece coated with a solid lubricating layer.

S3: Friction test - the workpiece coated with a solid lubricant layer was placed on a multi-functional friction and wear testing machine for friction testing, a load of 10 N was applied and a line speed of 6 mm/s was applied, and a stable low friction state was not obtained at room temperature (The friction coefficient fluctuates around 0.4), and the friction test results are shown in Figure 5.

Comparative example 2:

A method of testing the tribological behavior of composite coatings containing only textured surfaces, the method comprising the steps of:

S1: Preparation of textured surface—place a bearing steel disk workpiece with a diameter of 30 mm and a thickness of 5 mm on the workbench of a laser marking machine, and control the laser path through Ezcad software to obtain a micro-cylindrical pit texture on the surface of the workpiece. The diameter of the pit is 100 μm, the depth is 120 μm, and the area density is 16%. After the surface texture treatment, sandpaper with a mesh number of 2000# is used for grinding and polishing to remove residual waste on the surface, and the workpiece with the textured surface is ultrasonically After cleaning, it is placed in an oven to dry to obtain a textured surface with a clean surface.

Among them, the surface texture treatment technology can also be embossing processing technology, abrasive gas jet processing technology, electrolytic processing technology or reactive ion etching processing technology, and the specific surface texturing treatment is not limited to the ones mentioned in this embodiment. The way.

S2: Preparation of two-dimensional material dispersion - add 0.2 g graphene oxide and 0.2 g molybdenum disulfide to the reagent bottle respectively, add deionized water to 100 g, and obtain uniformly dispersed 0.2 wt% graphene oxide under the action of ultrasound Mix the two-dimensional material dispersion with 0.2 wt% molybdenum disulfide.

Wherein, the two-dimensional material may also be one or more of graphene, graphene oxide, molybdenum disulfide, tungsten disulfide, molybdenum diselenide and hexagonal boron nitride.

S3: Preparation of solid lubricating layer - use the drop coating method to coat the two-dimensional material dispersion in S3 on the workpiece with a textured surface, and put it in a drying oven at 60°C for drying treatment; wait for the drying to complete Finally, the above operation was repeated 5 times to obtain a solid lubricating layer based on the textured surface.

S4: Friction test - put the workpiece treated by the above solid lubrication technology on a multi-functional friction and wear testing machine for friction test, apply a load of 10 N, and a line speed of 6 mm/s. At room temperature, the friction coefficient is only maintained at around 0.1 After 100 s, it rises to around 0.4, failing to obtain a stable ultra-low friction state. The friction test results are shown in Figure 6.

Comparative example 3:

A method of testing the tribological behavior of composite coatings based solely on boronizing layers, the method comprising the following steps:

S1: Preparation of boronizing strengthening layer - put a bearing steel disc workpiece with a diameter of 30 mm and a thickness of 5 mm into a molten salt electrolytic furnace, and keep it warm for 30 min at 900 °C and 20 A to complete the boronizing strengthening layer. Preparation: After the workpiece is cooled, put it into boiling water to remove the molten salt remaining on the surface of the workpiece, then ultrasonically clean the workpiece and dry it in an oven to obtain a workpiece to be coated with a boronizing strengthening layer.

Wherein, the boronizing method may also be solid boronizing or gas boronizing, and the specific boronizing operation is not limited to the method mentioned in this embodiment.

S2: Preparation of two-dimensional material dispersion - add 0.2 g graphene oxide and 0.2 g molybdenum disulfide to the reagent bottle respectively, add deionized water to 100 g, and obtain uniformly dispersed 0.2 wt% graphene oxide under the action of ultrasound Mix the two-dimensional material dispersion with 0.2 wt% molybdenum disulfide.

Wherein, the two-dimensional material may also be one or more of graphene, graphene oxide, molybdenum disulfide, tungsten disulfide, molybdenum diselenide and hexagonal boron nitride.

S3: Preparation of solid lubricating layer - use the drop coating method to coat the two-dimensional material dispersion in S2 on the surface of the workpiece with boronizing strengthening layer in S1, and put it in a drying oven at 60°C for drying treatment; After the drying was completed, the above operation was repeated 5 times to obtain a solid lubricating layer based on the boronizing strengthening layer.

S4: Friction test - put the workpiece treated by the above solid lubrication technology on a multi-functional friction and wear testing machine for friction test, apply a load of 10 N, and a line speed of 6 mm/s. At room temperature, stable low friction was not obtained state, the friction test results are shown in Fig. 7.

Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention without limitation. Although the present invention has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that the technical solutions of the present invention can be Modifications or equivalent replacements can be made without departing from the spirit and scope of the technical solutions of the present invention.

Claims (10)

1. a preparation method of a low-friction and wear-resistant composite coating containing a boronized layer and texture surface, is characterized in that, comprises the steps: Step (1) performing boronizing strengthening treatment, preparing a boronizing strengthening layer on the surface of the workpiece, and then removing the residue on the surface of the workpiece after boriding treatment; Step (2) performing surface texturing treatment on the boronized workpiece to form pits on the surface of the workpiece; Step (3) Coating the two-dimensional material dispersion on the surface of the workpiece, and performing drying treatment, repeating the coating and drying treatment operations until a solid self-lubricating coating based on a boronizing strengthening layer and a textured surface is obtained. layer. 2. the preparation method of the low-friction and wear-resistant composite coating containing boronizing layer and textured surface according to claim 1, is characterized in that, described workpiece is a kind of in steel, titanium alloy, multi-principal element alloy . 3. The preparation method of the low-friction and wear-resistant composite coating containing boronizing layer and textured surface according to claim 1, characterized in that, the boronizing strengthening treatment in step (1) adopts solid boronizing process or One of the molten salt electrolytic boronizing processes. 4. The preparation method of the low-friction and wear-resistant composite coating containing boronizing layer and textured surface according to claim 1, characterized in that, before performing the boronizing strengthening treatment in step (1), the workpiece surface needs to be cleaning; and ultrasonic cleaning is used to remove the residues on the surface of the workpiece after boriding treatment. 5. The method for preparing a low-friction and wear-resistant composite coating containing a boronized layer and a textured surface according to claim 1, wherein the surface texturing treatment in step (2) includes embossing processing , abrasive gas jet processing, electrolytic processing, reactive ion etching processing, and laser surface texturing. 6. The method for preparing a low-friction and wear-resistant composite coating containing a boronized layer and a textured surface according to claim 1, wherein the pits formed on the surface of the workpiece in step (2) are microcylindrical pits pits, and the pits have a diameter of 20-300 μm, a depth of 20-500 μm, and an area density of 5%-35%. 7. The method for preparing a low-friction and wear-resistant composite coating containing a boronizing layer and a textured surface according to claim 1, wherein the two-dimensional material in step (3) includes graphene, graphene oxide One or more of , molybdenum disulfide, tungsten disulfide, molybdenum diselenide and hexagonal boron nitride. 8. The method for preparing a low-friction and wear-resistant composite coating containing a boronized layer and a textured surface according to claim 1, wherein the solvent of the two-dimensional material dispersion in step (3) includes water, One or more of alkylamine, polyethyleneimine, polyacrylic acid, polyethylene glycol. 9. The preparation method of the low-friction and wear-resistant composite coating containing boronizing layer and textured surface according to claim 1, characterized in that the coating method in step (3) includes drip coating, spray coating, One of spin coating and electrophoretic deposition. 10. The method for preparing a low-friction and wear-resistant composite coating containing a boronized layer and a textured surface according to claim 1, wherein the coating and drying operations in step (3) are repeated for at least three times.

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