Coating for compressor, coating, compressor and method for forming coating on surface of substrate

Abstract

The invention relates to the technical field of compressors, and discloses a coating for a compressor. The coating comprises graphite, carbon fibers and nanoparticles. The coating is formed by mixing graphite, carbon fibers and nanoparticles, so that the coating has better self-lubricating performance, and the friction resistance of the coating can be effectively improved. The coating is applied to the compressor, and a uniform and compact protective coating can be formed on the surface of a base body. The coating has low friction coefficient and high wear resistance, and can reduce the friction and wear of the surface of the substrate under the working condition of high rotating speed, thereby prolonging the maintenance period and service life of the compressor. The invention further discloses the coating for the compressor, the compressor and a method for forming the coating on the surface of the base body.

Description

Technical Field

[0001] This application relates to the field of compressor technology, and more specifically to a coating, a coating material for a compressor, a compressor, and a method for forming a coating on a substrate surface. Background Technology

[0002] Currently, with fierce cost competition in the air conditioning market, miniaturization and high-speed operation of air conditioning compressors have become the trend. However, compressors suffer from crankshaft wear under high-speed operating conditions.

[0003] Related technologies provide an anti-wear surface coating by applying a precursor powder material to the worn surfaces of metal components of a scroll or rotary compressor via spraying. The precursor powder material comprises a powdered thermoplastic polymer, first lubricant particles, and second lubricant particles. The precursor powder material is heated to form a generally uniform coating covering the underlying metal component with a thickness less than or equal to about 0.006 inches. Scroll compressor components having worn surfaces coated with the anti-wear coating may include hubs or bushings that engage with a flat portion of the crankshaft having the anti-wear coating to improve overall performance and reduce wear.

[0004] In the process of implementing the embodiments of this disclosure, at least the following problems were found in the related art:

[0005] In related technologies, anti-wear coatings are more suitable for low-speed compressors and cannot meet the lubrication and wear resistance requirements of high-speed compressors. After a period of use, the anti-wear coating wears off, which leads to wear on the component substrate and consequently component failure and compressor damage.

[0006] It should be noted that the information disclosed in the background section above is only used to enhance the understanding of the background of this application, and therefore may include information that does not constitute prior art known to those skilled in the art. Summary of the Invention

[0007] To provide a basic understanding of some aspects of the disclosed embodiments, a brief summary is given below. This summary is not intended as a general commentary, nor is it intended to identify key / important components or describe the scope of protection of these embodiments, but rather as a prelude to the detailed description that follows.

[0008] This disclosure provides a coating, a coating layer, a compressor, and a method for forming a coating on a substrate surface to improve the wear resistance of the substrate of a high-speed compressor component.

[0009] According to a first aspect of the present invention, a coating for a compressor is provided, comprising: graphite, carbon fiber, and nanoparticles.

[0010] Optionally, the nanoparticles are organic resins.

[0011] Optionally, the coating may also include a solvent, including N-methyl-2-pyrrolidone.

[0012] Optionally, the concentration of graphite ranges from 8% to 30%, the concentration of carbon fiber ranges from less than or equal to 10%, and the concentration of N-methyl-2-pyrrolidone ranges from 30% to 60%.

[0013] Optionally, the concentration of graphite is 15%, the concentration of carbon fiber is 2%, and the concentration of N-methyl-2-pyrrolidone is 50%.

[0014] According to a second aspect of the present invention, a coating for a compressor is provided, the coating being formed from a coating material as described in any of the above-disclosed embodiments.

[0015] According to a third aspect of the present invention, a compressor is provided, comprising: a substrate, the surface of which is provided with a coating as described in the above-disclosed embodiments; wherein the coating as described in the above-disclosed embodiments forms a first coating on the surface of the substrate.

[0016] Optionally, the thickness of the first coating ranges from 5 μm to 15 μm.

[0017] Optionally, the substrate surface is further provided with a second coating, which is disposed between the substrate surface and the first coating.

[0018] Optionally, the second coating is formed by a phosphating process.

[0019] Optionally, the thickness of the second coating is 2 μm to 5 μm.

[0020] Optionally, the substrate includes a crankshaft, the surface of which is provided with a first coating; and / or, the substrate is made of ductile iron or steel.

[0021] According to a fourth aspect of the present invention, a method for forming a coating on a substrate surface is provided, the method comprising the steps of: spraying a coating as described in the above-disclosed embodiments onto the substrate surface; placing the substrate in an insulated box to allow solvent evaporation; and placing the substrate in a high-temperature oven to cure the coating.

[0022] Optionally, the temperature of the incubator is set to 80°C, and the substrate is placed in the incubator for 30 minutes; and / or, the temperature of the high-temperature oven is set to 210°C, and the substrate is placed in the high-temperature oven for 1 hour.

[0023] Optionally, before the coating is sprayed onto the substrate surface, the substrate surface may also be subjected to sandblasting or phosphating treatment.

[0024] The coating, coating layer, compressor, and method for forming a coating on a substrate surface provided in this disclosure can achieve the following technical effects:

[0025] The coating for compressors provided in this disclosure is a mixture of graphite, carbon fiber, and nanoparticles, giving it good self-lubricating properties and effectively improving its anti-friction properties. When applied to the compressor, the coating forms a uniform and dense protective coating on the substrate surface. The coating has a low coefficient of friction and high wear resistance; under high-speed operating conditions, it reduces friction and wear on the substrate surface, thereby extending the compressor's maintenance cycle and service life.

[0026] The above general description and the description below are exemplary and illustrative only and are not intended to limit this application. Attached Figure Description

[0027] One or more embodiments are illustrated by way of example with reference to the accompanying drawings. These illustrations and drawings do not constitute a limitation on the embodiments. Elements having the same reference numerals in the drawings are shown as similar elements. The drawings are not to be scaled. And wherein:

[0028] Figure 1 This is a cross-sectional schematic diagram of a compressor provided in an embodiment of this disclosure;

[0029] Figure 2 This is a schematic diagram of the structure of a crankshaft provided in an embodiment of this disclosure;

[0030] Figure 3 This is a schematic diagram of a structure in which a first coating is provided on the surface of a substrate, according to an embodiment of the present disclosure;

[0031] Figure 4 This is a schematic diagram of a structure in which a first coating and a second coating are provided on the surface of a substrate, according to an embodiment of the present disclosure.

[0032] Figure label:

[0033] 10: Compressor;

[0034] 20: Matrix; 21: Crankshaft; 211: Long axis; 212: Short axis;

[0035] 30: First coating; 31: Second coating. Detailed Implementation

[0036] To provide a more detailed understanding of the features and technical content of the embodiments of this disclosure, the implementation of the embodiments of this disclosure will be described in detail below with reference to the accompanying drawings. The accompanying drawings are for illustrative purposes only and are not intended to limit the embodiments of this disclosure. In the following technical description, for ease of explanation, several details are used to provide a full understanding of the disclosed embodiments. However, one or more embodiments may still be implemented without these details. In other cases, well-known structures and devices may be simplified in their depiction to simplify the drawings.

[0037] The terms "first," "second," etc., used in the specification, claims, and accompanying drawings of this disclosure are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate for the embodiments of this disclosure described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion.

[0038] In this disclosure, the terms "upper," "lower," "inner," "middle," "outer," "front," and "rear," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. These terms are primarily for better describing the embodiments of this disclosure and their implementations, and are not intended to limit the indicated devices, elements, or components to having a specific orientation, or to require them to be constructed and operated in a specific orientation. Furthermore, some of the aforementioned terms may be used to indicate other meanings besides orientation or positional relationship; for example, the term "upper" may in some cases indicate a dependency or connection relationship. Those skilled in the art can understand the specific meaning of these terms in this disclosure according to the specific circumstances.

[0039] Furthermore, the terms "set up," "connect," and "fix" should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral structure; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, or it can be an internal connection between two devices, components, or parts. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of this disclosure according to the specific circumstances.

[0040] Unless otherwise stated, the term "multiple" means two or more.

[0041] In this embodiment of the disclosure, the character " / " indicates that the objects before and after it are in an "or" relationship. For example, A / B means: A or B.

[0042] The term "and / or" describes an association between objects, indicating that three relationships can exist. For example, A and / or B means: A or B, or A and B.

[0043] It should be noted that, unless otherwise specified, the embodiments and features described in the present disclosure can be combined with each other.

[0044] Currently, with fierce cost competition in the air conditioning market, miniaturization and high-speed operation of air conditioning compressors have become the trend. However, compressors suffer from crankshaft wear under high-speed operating conditions.

[0045] Related technologies provide an anti-wear surface coating by applying a precursor powder material to the worn surface of a metal component of a scroll or rotary compressor via spraying. The precursor powder material comprises a powdered thermoplastic polymer, first lubricant particles, and second lubricant particles. The precursor powder material is heated to form a generally uniform coating covering the underlying metal component with a thickness less than or equal to about 0.006 inches. Scroll compressor components with worn surfaces coated with the anti-wear coating may include hubs or bushings that engage with a flat portion of the crankshaft with the anti-wear coating to improve overall performance and reduce wear. However, the anti-wear coating in this technology is more suitable for low-speed compressors and cannot meet the lubrication and wear resistance requirements of high-speed compressors. After a period of use, the anti-wear coating wears off, leading to wear on the component substrate and ultimately component failure and compressor damage.

[0046] To improve the wear resistance of the component substrate 20 of the high-speed compressor 10, this disclosure provides a coating for the compressor 10, including graphite, carbon fiber and nanoparticles.

[0047] Graphite, as a solid lubricant, can reduce the coefficient of friction and enhance the lubricity of the coating, thereby reducing wear on the substrate surface during operation. Graphite also possesses excellent thermal conductivity, enabling it to form a good heat conduction effect within the coating, aiding in heat dissipation and thus enhancing the thermal stability of the coating. Carbon fiber provides the coating with additional strength and toughness. Nanoparticles, with their ultra-small size and high specific surface area, can form a dense protective layer, further enhancing the coating's wear resistance and corrosion resistance.

[0048] The coating for compressor 10 provided in this embodiment is a mixture of graphite, carbon fiber, and nanoparticles, giving it good self-lubricating properties and effectively improving its anti-friction properties. When applied to compressor 10, the coating forms a uniform and dense protective coating on the surface of substrate 20. The coating has a low coefficient of friction and high wear resistance; under high-speed operating conditions, it reduces friction and wear on the surface of substrate 20, thereby extending the maintenance cycle and service life of compressor 10.

[0049] Optionally, the nanoparticles are organic resins.

[0050] The nanoparticles, made from organic resin, enhance the coating's abrasion resistance while providing better adhesion and chemical stability, thus increasing the bonding strength between the coating and the substrate surface. This improves the coating's durability and extends the service life of the resulting coating layer.

[0051] It is understandable that nanoparticles such as silica nanoparticles and silicon carbide nanoparticles can also improve the wear resistance of coatings.

[0052] Optionally, the coating may also include a solvent, including N-methyl-2-pyrrolidone.

[0053] N-Methyl-2-pyrrolidone exhibits excellent solubility and chemical stability, enabling it to better dissolve nanoparticles and simultaneously dissolve graphite and carbon fibers. This improves the uniformity and leveling properties of the coating, allowing it to be evenly applied to the surface of the substrate 20. Furthermore, N-methyl-2-pyrrolidone has low volatility, preventing excessive evaporation during the coating drying process and contributing to the formation of a uniform coating on the substrate 20. In addition, the solvent's chemical stability helps protect the coating from chemical reactions during the coating process.

[0054] Optionally, the coating may also include an organic binder.

[0055] Organic binders can form strong chemical bonds with graphite, carbon fibers, and nanoparticles, thereby enhancing the cohesiveness of the coating components. Organic binders can also form strong chemical bonds with the surface of the substrate 20, thereby enhancing the adhesion of the coating to the substrate 20 surface. Organic binders can be silicone resins, epoxy resins, or polyurethanes, etc.

[0056] Optionally, the concentration of graphite ranges from 8% to 30%, the concentration of carbon fiber ranges from less than or equal to 10%, and the concentration of N-methyl-2-pyrrolidone ranges from 30% to 60%.

[0057] The concentrations described in the embodiments of this disclosure refer to volume percentage concentrations.

[0058] When the graphite concentration is greater than or equal to 8%, it can reduce the coefficient of friction of the coating, thereby reducing the wear rate of the coating and improving its wear resistance. Graphite particles form a physical barrier in the coating, helping to disperse surface stress. The coating forms a layer on the substrate surface, reducing coating wear. When the graphite concentration is less than or equal to 30%, it can improve the stress dispersion of the coating while preventing excessive graphite concentration from causing the coating to become brittle and reducing its wear resistance.

[0059] When the carbon fiber concentration is less than or equal to 10%, it can improve the mechanical strength and abrasion resistance of the coating while preventing the increased carbon fiber content from causing poor coating flowability and affecting the uniformity of the coating. Controlling the carbon fiber concentration to less than or equal to 10% can also reduce the cost of the coating.

[0060] When the concentration of N-methyl-2-pyrrolidone is greater than or equal to 30%, it enables components such as graphite, carbon fiber, and nanoparticles to dissolve and disperse better within the N-methyl-2-pyrrolidone, forming a homogeneous mixture, thereby improving the leveling and uniformity of the coating. When the concentration of N-methyl-2-pyrrolidone is less than or equal to 60%, it can reduce the viscosity of the coating, avoiding affecting its flowability, and also reducing the cost of the coating.

[0061] The embodiments disclosed herein control the concentrations of graphite, carbon fiber, and N-methyl-2-pyrrolidone in the coating within a suitable range, thereby forming a specific concentration ratio between graphite, carbon fiber, and N-methyl-2-pyrrolidone. This optimizes the rheological properties and mechanical strength of the coating, and improves the uniformity and stability of the coating.

[0062] It is understood that the concentration of graphite can be 8%, 10%, 12%, 15%, 20%, 25%, or 30%, the concentration of carbon fiber can be 1%, 2%, 3%, 4%, 5%, 6%, 7%, 8%, 9%, or 10%, and the concentration of N-methyl-2-pyrrolidone can be 30%, 35%, 40%, 45%, 50%, 55%, or 60%.

[0063] Optionally, the concentration of graphite is 15%, the concentration of carbon fiber is 2%, and the concentration of N-methyl-2-pyrrolidone is 50%.

[0064] The concentration of graphite is 15%, the concentration of carbon fiber is 2%, and the concentration of N-methyl-2-pyrrolidone is 50%, which creates a specific concentration ratio between graphite, carbon fiber and N-methyl-2-pyrrolidone, providing the coating with better wear resistance, adhesion, uniformity and chemical stability.

[0065] This disclosure provides a coating for a compressor 10, the coating being formed from a coating material as described in any of the above-disclosed embodiments.

[0066] The coating for compressor 10 provided in this disclosure embodiment has all the beneficial effects of the coating described in any one of the above-disclosed embodiments because it includes the coating described in any one of the above-disclosed embodiments.

[0067] The layered structure of graphite forms a natural sliding layer in the coating, making the coating surface smoother and effectively reducing energy loss and component wear in the compressor 10. The high strength and high modulus of carbon fiber make the coating less prone to damage under high loads, improving its stability and durability in the high-speed environment of the compressor 10. Nanoparticles, due to their ultra-small size and high specific surface area, can form a dense protective layer in the coating, effectively resisting erosion from external corrosive media, while also improving the coating's hardness and wear resistance.

[0068] The coating provided in this embodiment has the characteristics of low coefficient of friction, extremely high wear resistance, high bonding strength with the metal substrate 20, wide operating temperature range, strong corrosion resistance, and good oil and grease resistance. The coating provided in this embodiment can firmly adhere to the surface of the substrate 20 of the compressor 10 parts, significantly reducing friction and wear between the parts and the substrate 20, reducing the heat generated by friction, thereby extending the maintenance cycle and service life of the compressor 10.

[0069] Combination Figure 1-4 As shown, this disclosure provides a compressor 10, including a substrate 20, the surface of which is provided with a coating as described in the above-disclosed embodiments; wherein, the coating as described in the above-disclosed embodiments forms a first coating 30 on the surface of the substrate 20.

[0070] The substrate 20 has a coating as described in the above-disclosed embodiments. Alternatively, the coating can be directly applied to the surface of the substrate 20, forming a first coating 30 that is in direct contact with the surface of the substrate 20. Or, the coating can be spaced apart on the surface of the substrate 20, forming a first coating 30 that is not in direct contact with the surface of the substrate 20, and a second coating 31 can be disposed between the first coating 30 and the surface of the substrate 20.

[0071] The compressor 10 provided in this embodiment of the disclosure, because it includes the coating described in the above-disclosed embodiments, possesses all the beneficial effects of the coating described in the above-disclosed embodiments. The coating, including graphite, carbon fiber, and nanoparticles, forms a first coating 30 on the surface of the substrate 20, providing direct protection to the substrate 20 and reducing the possibility of direct contact wear and corrosion between substrates 20, thereby improving the wear resistance of the substrate 20 of the high-speed compressor 10. The substrate 20 can be components such as the crankshaft 21, piston, and cylinder in the compressor 10.

[0072] Optionally, the thickness of the first coating 30 ranges from 5 μm to 15 μm.

[0073] When the thickness of the first coating 30 is greater than or equal to 5 μm, the first coating 30 has sufficient thickness to enhance wear resistance and durability, provide sufficient protection for the substrate 20, and thus extend the service life of the first coating 30.

[0074] When the thickness of the first coating 30 is less than or equal to 15 μm, it can maintain the flexibility of the first coating 30, better adapt to the slight deformation of the substrate 20, and reduce cracking of the first coating 30 caused by thermal expansion and contraction of the substrate 20 or mechanical vibration. The thinner thickness can also improve the adhesion between the first coating 30 and the substrate 20, thereby reducing the risk of the first coating 30 falling off.

[0075] The embodiments disclosed herein limit the thickness range of the first coating 30 to 5 μm to 15 μm, which can provide sufficient protection for the substrate 20 of the compressor 10, prevent the substrate 20 from being worn and corroded, and at the same time avoid the first coating 30 being too thick and affecting the motion performance of the substrate 20.

[0076] It is understandable that the thickness of the first coating 30 can be 5μm, 8μm, 10μm, 12μm, or 15μm.

[0077] Optionally, the thickness of the first coating 30 is 8 μm.

[0078] When the thickness of the first coating 30 is 8μm, the wear resistance, adhesion, and flexibility of the first coating 30 can be balanced, forming a better protection for the surface of the substrate.

[0079] Optionally, combined Figure 4 As shown, the surface of the substrate 20 is further provided with a second coating 31, which is disposed between the surface of the substrate 20 and the first coating 30.

[0080] A second coating 31 is first applied to the surface of the substrate 20. Then, based on the second coating 31, the coating described in the above-disclosed embodiment is used to treat the surface of the substrate 20, forming a first coating 30 on the outside of the second coating 31. The second coating 31 is disposed between the surface of the substrate 20 and the first coating 30, providing an additional protective layer for the substrate 20 and enhancing its corrosion resistance and wear resistance. This double-coating structure provides stronger wear protection for the substrate 20, thereby extending its service life.

[0081] It is understood that the surface of the substrate 20 may be provided with only the first coating 30, or it may be provided with both the first coating 30 and the second coating 31.

[0082] Optionally, the second coating 31 is formed by a phosphating process.

[0083] The surface of the substrate 20 is first subjected to phosphating treatment to form a uniform and dense phosphating film, forming the second coating 31. This phosphating film, as the second coating 31, is located between the surface of the substrate 20 and the first coating 30, forming a good chemical bond with both the substrate 20 surface and the second coating 31. This enhances the adhesion between the second coating 31 and the first coating 30, reducing the risk of them peeling off. Simultaneously, the phosphating film has high hardness and good lubricity, effectively reducing wear on the second coating 31 and improving its wear resistance. A manganese phosphate coating agent can be used to phosphate the surface of the substrate 20.

[0084] Optionally, the thickness of the second coating 31 is 2 μm to 5 μm.

[0085] When the thickness of the second coating 31 is greater than or equal to 2 μm, it provides sufficient thickness to lubricate and protect the surface of the substrate 20, enabling it to withstand greater friction and reducing wear on the surface of the second coating 31. A thickness of 2 μm or greater also more effectively isolates the substrate 20 from corrosive media, thereby improving the corrosion resistance of the substrate 20. This extends the service life and effectiveness of the second coating 31, enhancing the wear and corrosion resistance of the substrate 20. Simultaneously, as an intermediate layer between the surface of the substrate 20 and the first coating 30, the porous structure of the phosphating film enhances the adhesion between the second coating 31 and the surface of the substrate 20 and the first coating 30. Sufficient thickness of the second coating 31 also enhances the adhesion and durability of the coating structure.

[0086] When the thickness of the second coating 31 is less than or equal to 5 μm, it avoids the second coating 31 being too thick, making it easier to achieve uniform coating and improving the uniformity of the coating. A thinner second coating 31 can also better accommodate the minute deformations of the substrate 20, reducing coating cracking caused by thermal expansion and contraction of the substrate 20 or mechanical vibration, thereby improving the durability of the second coating 31. At the same time, a thinner second coating 31 can be formed in a shorter time, which helps to improve the efficiency of the substrate 20 surface treatment and speeds up production.

[0087] The embodiments disclosed herein limit the thickness of the second coating 31 to between 2 μm and 5 μm, which can improve the uniformity and consistency of the second coating 31, while also preventing the second coating 31 from being too thick and affecting the performance of the substrate 20.

[0088] It is understandable that the thickness of the second coating 31 can be 2μm, 3μm, 4μm, or 5μm.

[0089] Optionally, the thickness of the second coating 31 is 3 μm.

[0090] When the thickness of the second coating 31 is 3μm, the wear resistance, adhesion, and flexibility of the second coating 31 can be balanced, and it can form better protection for the surface of the substrate 20.

[0091] Optionally, the thickness of the second coating 31 is 2 μm to 5 μm, and the thickness of the first coating 30 is 5 μm to 15 μm.

[0092] This disclosure embodiment also specifies that the thickness of the second coating 31 is 2μm to 5μm, and the thickness of the first coating 30 is 5μm to 15μm, so that the first coating 30 and the second coating 31 can achieve a combination of two coatings with appropriate thicknesses. This can provide better overall performance for the two-layer coating structure, including wear resistance, corrosion resistance, heat resistance, etc., thereby improving the protective effect and service life of the substrate 20.

[0093] The thickness of the first coating 30 is 5 μm to 15 μm. The thicker first coating 30 provides a stronger wear-resistant layer, while the appropriate thickness of the second coating 31 helps to further improve the overall wear resistance, while maintaining the flexibility and adhesion of the overall coating structure. The thicker first coating 30 can serve as the main corrosion-resistant layer, while the second coating 31 can provide an auxiliary protective layer, enhancing the barrier effect against corrosive media. The thickness of the second coating 31 is 2 μm to 5 μm. The second coating 31 serves as an intermediate layer between the substrate 20 and the first coating 30. The thinner second coating 31 compared to the first coating 30 helps to improve the adhesion between the substrate 20 and the first coating 30, and enhances the adhesion stability between the substrate 20 and the first and second coatings 30.

[0094] Optionally, combined Figure 1-4 As shown, the substrate 20 includes a crankshaft 21, and the surface of the crankshaft 21 is provided with a first coating 30.

[0095] In the high-speed compressor 10, the crankshaft 21, as a key rotating component, directly affects the stability and service life of the entire compressor 10. A first coating 30 is applied to the surface of the crankshaft 21. This first coating 30 features a low coefficient of friction, extremely high wear resistance, a wide operating temperature range, strong corrosion resistance, and good oil and grease resistance, thus improving the wear resistance of the crankshaft 21 in the high-speed compressor 10. Alternatively, a first coating 30 and a second coating 31 can be simultaneously applied to the surface of the crankshaft 21. This double-layer coating structure can more effectively improve the lubricity and wear resistance of the crankshaft 21 surface. It also enhances the corrosion resistance of the crankshaft 21 surface, providing more comprehensive protection for the crankshaft 21.

[0096] Optionally, the base 20 may be made of ductile iron or steel.

[0097] The substrate 20 is made of ductile iron or steel, which enhances its strength, toughness, and wear resistance, enabling stable operation under high load and high speed conditions. The first coating 30 also exhibits high bonding strength with the metal substrate 20. Applying the first coating 30 to the surface of the ductile iron or steel substrate 20 ensures a more secure adhesion. When the substrate 20 is a crankshaft 21, the ductile iron or steel material enables long-term stable operation and high-efficiency operation, providing strong support for the overall performance and reliability of the compressor 10.

[0098] This disclosure provides a method for forming a coating on the surface of a substrate 20, the method comprising the following steps: spraying a coating as described in the above-disclosed embodiment onto the surface of the substrate 20; placing the substrate 20 in an insulated box to allow the solvent to evaporate; and placing the substrate 20 in a high-temperature oven to cure the coating.

[0099] The coating described in the above-disclosed embodiments is applied to the surface of the substrate 20 by spraying. This spraying process is not only simple to operate but also enables rapid coating coverage, forming a uniform coating. Here, the coating can be directly sprayed onto the surface of the substrate 20, directly adhering the first coating layer 30 to the substrate 20 surface. The substrate 20 coated with the coating is placed in an insulated box to allow the solvent to fully evaporate, improving the quality of the coating. Then, the substrate 20 is placed in a high-temperature oven for curing. The high-temperature environment causes the polymer chains in the coating to cross-link, forming a strong and stable protective layer. This ensures a tight bond and uniform distribution between the cured coating and the substrate 20, effectively improving the coating's wear resistance, corrosion resistance, and high-temperature resistance, thereby enhancing the protective effect and service life of the first coating layer 30.

[0100] Exemplarily, the method for forming a coating on the surface of substrate 20 includes the following steps: First, the surface of substrate 20 is cleaned and degreased. Then, the coating described in the above embodiment is stirred evenly, and substrate 20 is placed on a special spraying fixture and rotated to spray the stirred coating onto the surface of substrate 20 through the equipment. Rotating substrate 20 ensures that the coating is sprayed evenly and comprehensively onto the surface of substrate 20, forming a first coating 30. This improves spraying efficiency and also enhances the uniformity of the first coating 30. After spraying, substrate 20 is placed in an insulated box to allow the solvent to evaporate, and then substrate 20 is placed in a high-temperature oven to cure the coating. Finally, substrate 20 is removed and allowed to cool naturally to room temperature. This forms a strong first coating 30 on the surface of substrate 20, thereby providing wear-resistant protection to substrate 20 under the high-speed operation of compressor 10.

[0101] Optionally, the temperature of the incubator is set to 80°C, and the substrate 20 is placed in the incubator for 30 minutes.

[0102] At 80℃, the solvent evaporation rate is moderate, allowing sufficient time for uniform distribution within the coating. This results in a uniform film thickness and avoids coating defects such as pinholes and orange peel caused by rapid solvent evaporation. A 30-minute holding time allows for slow solvent evaporation, reducing bubbles and unevenness on the coating surface, thus improving coating quality and appearance. Appropriate solvent evaporation conditions contribute to the adhesion between the coating and the substrate 20, as slow solvent evaporation reduces stress within the coating, thereby enhancing its durability and protective properties.

[0103] Meanwhile, setting the solvent evaporation temperature to 80℃ also avoids structural impacts on graphite, carbon fiber, and nanoparticles in the coating. At lower evaporation temperatures, graphite, carbon fiber, and nanoparticles in the coating are less likely to aggregate or settle, maintaining the uniformity and stability of the coating.

[0104] When N-methyl-2-pyrrolidone is used as the solvent, placing the substrate 20 at 80°C for 30 minutes allows for the complete volatilization of N-methyl-2-pyrrolidone. This operating condition effectively controls the volatilization rate of N-methyl-2-pyrrolidone, achieving a uniform coating while also improving production efficiency.

[0105] Optionally, the temperature of the high-temperature oven is set to 210°C, and the substrate 20 is placed in the high-temperature oven for 1 hour.

[0106] The substrate 20 with the coating, after the solvent has evaporated, is placed in a high-temperature oven at 210°C for 1 hour to cure the coating. The high temperature of 210°C promotes intermolecular forces between the organic binder and the surface of the substrate 20, forming stronger chemical bonds. Therefore, high-temperature curing helps enhance the adhesion between the coating and the substrate 20 surface. High-temperature baking helps to completely evaporate the solvent and other low-molecular-weight components in the coating, reducing porosity and defects in the coating, thereby improving the coating's density and corrosion resistance. Simultaneously, the coating cured in a high-temperature environment exhibits better thermal stability. Furthermore, at 210°C, the organic binder in the coating undergoes a chemical reaction, forming a three-dimensional network structure, achieving complete curing of the coating and improving the hardness and wear resistance of the first coating 30.

[0107] The present invention limits the curing time to 1 hour to ensure uniform curing of all parts of the coating, avoids performance differences caused by uneven curing, and improves the uniformity and consistency of the first coating 30.

[0108] The high-temperature oven is set to 210℃, and the substrate 20 is placed for 1 hour. These process conditions help achieve complete curing of the coating, improving its mechanical properties and adhesion. Simultaneously, they enhance the uniformity and appearance quality of the coating, improve the protective effect on the substrate 20 surface, and extend its service life.

[0109] Optionally, before the coating is sprayed onto the surface of the substrate 20, the surface of the substrate 20 may be subjected to sandblasting or phosphating.

[0110] Before the coating is sprayed onto the surface of the substrate 20, the surface of the substrate 20 is sandblasted. This not only effectively cleans the surface of the substrate 20, but also creates micro-roughness on the surface of the substrate 20 through physical action, thereby enhancing the adhesion between the first coating 30 and the surface of the substrate 20 and improving the durability of the first coating 30.

[0111] Before the coating is sprayed onto the surface of the substrate 20, the surface of the substrate 20 is subjected to a phosphate treatment to form a second coating 31. This process step provides a stronger bond between the first coating 30 and the surface of the substrate 20. The phosphate treatment forms a uniform phosphate film on the surface of the substrate 20, namely the second coating 31. When the coating described in the above embodiment is sprayed onto the surface of the second coating 31, the chemical bonding and physical interlocking between the phosphate film and the coating make the first coating 30 adhere more firmly to the outside of the second coating 31. The phosphate treatment not only improves the adhesion of the first coating 30, but also enhances the corrosion resistance and wear resistance of the overall coating.

[0112] This application involves running the compressor 10 at high speed with a small amount of lubricating oil remaining inside, and conducting comparative tests using a conventional crankshaft and a crankshaft 21 with a first coating 30, respectively, and measuring the wear at the friction pair location of the crankshaft 21. Figure 2 As shown, crankshaft 21 includes a long shaft 211 and a short shaft 212. The wear of the long shaft 211 and the short shaft 212 were measured respectively. The thickness of the first coating 30 is 10 μm. Crankshaft 21 is not phosphated. The compressor 10 operates at a speed of 90 Hz for 500 hours. When the compressor 10 operates at a speed of 90 Hz, crankshaft 21 bears a heavy load. In the verification test, using a speed of 90 Hz can verify the applicability of crankshaft 21 in the high-speed compressor 10 operating environment. Specific comparative test data are shown in Table 1 below.

[0113] Table 1

[0114]

[0115] Crankshafts 1 to 3 are crankshafts with a first coating 30, and the data difference between crankshafts 1 to 3 is the experimental error. Crankshafts 4 to 6 are conventional crankshafts, and the data difference between crankshafts 4 to 6 is the experimental error. According to the test data in Table 1, after multiple tests, the wear of crankshafts 21 with the first coating 30 at both the long shaft 211 and short shaft 212 positions is less than that of conventional crankshafts. The results show that the first coating 30 formed on the surface of the substrate 20 by the coating provided in the embodiments of the present invention has better wear resistance and can improve the wear resistance of crankshaft 21 in the high-speed compressor 10.

[0116] The foregoing description and accompanying drawings fully illustrate embodiments of the present disclosure to enable those skilled in the art to practice them. Other embodiments may include structural and other changes. The embodiments represent only possible variations. Individual components and functions are optional unless explicitly required, and the order of operation may vary. Parts and features of some embodiments may be included or substituted for parts and features of other embodiments. Embodiments of the present disclosure are not limited to the structures described above and shown in the accompanying drawings, and various modifications and changes may be made without departing from its scope. The scope of the present disclosure is limited only by the appended claims.

Claims

1. A coating for a compressor, characterized in that, comprising: graphite, carbon fiber and nano-particles.

2. The coating according to claim 1, wherein, the nano-particles are organic resin.

3. The coating of claim 1, wherein, further comprising: a solvent, the solvent comprising N-methyl-2-pyrrolidone.

4. The coating according to claim 3, wherein, the concentration of graphite ranges from 8% to 30%, the concentration of carbon fiber is less than or equal to 10%, and the concentration of N-methyl-2-pyrrolidone ranges from 30% to 60%.

5. The coating according to claim 3, wherein, the concentration of graphite is 15%, the concentration of carbon fiber is 2%, and the concentration of N-methyl-2-pyrrolidone is 50%.

6. A coating for a compressor, wherein, the coating is formed from the coating according to any one of claims 1 to 5.

7. A compressor characterized by, comprising: a base body, the surface of the base body being provided with the coating according to claim 6; wherein the coating according to claim 6 forms a first coating on the surface of the base body.

8. The compressor according to claim 7, wherein, the thickness of the first coating ranges from 5 μm to 15 μm.

9. The compressor according to claim 7, wherein, the surface of the base body is further provided with a second coating, the second coating being disposed between the surface of the base body and the first coating.

10. The compressor according to claim 9, wherein, the second coating is formed by a phosphating process.

11. The compressor according to claim 9, wherein, the thickness of the second coating ranges from 2 μm to 5 μm.

12. The compressor according to any one of claims 7 to 11, wherein, the base body comprises a crankshaft, the surface of the crankshaft being provided with the first coating; and / or, the base body is made of spheroidal graphite cast iron material or steel material.

13. A method of forming a coating on a substrate surface, characterized by, the method comprising the steps of: spraying the coating according to any one of claims 1 to 5 on the surface of the base body; placing the base body in an incubator to volatilize the solvent; placing the base body in a high-temperature oven to solidify the coating.

14. The method according to claim 13, wherein, the temperature of the incubator is set to 80 °C, and the base body is placed in the incubator for 30 minutes; and / or, the temperature of the high-temperature oven is set to 210 °C, and the base body is placed in the high-temperature oven for 1 hour.

15. The method according to claim 13 or 14, characterized in that, the method further comprising, before the step of spraying the coating on the surface of the base body: sandblasting or phosphating the surface of the base body.

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