CN114703002B - Composite lubricating material, preparation method thereof and application thereof in space lubrication - Google Patents
Composite lubricating material, preparation method thereof and application thereof in space lubrication Download PDFInfo
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- C10M169/00—Lubricating compositions characterised by containing as components a mixture of at least two types of ingredient selected from base-materials, thickeners or additives, covered by the preceding groups, each of these compounds being essential
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- C10M2201/06—Metal compounds
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- C10M2203/00—Organic non-macromolecular hydrocarbon compounds and hydrocarbon fractions as ingredients in lubricant compositions
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- C10M2215/00—Organic non-macromolecular compounds containing nitrogen as ingredients in lubricant compositions
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- C10N2030/00—Specified physical or chemical properties which is improved by the additive characterising the lubricating composition, e.g. multifunctional additives
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- C10N—INDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS
- C10N2050/00—Form in which the lubricant is applied to the material being lubricated
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Abstract
The invention belongs to the technical field of space mechanical lubrication, and particularly relates to a composite lubricating material, a preparation method thereof and application thereof in space lubrication. The composite lubricating material provided by the invention comprises MoS 2 A solid lubricant film and a coating disposed on the MoS 2 The supermolecule gel lubricant on the surface of the solid lubricating film is obtained by gelling N-D-glucosyl-L-leucine hexadecyl ester and polyalkyl cyclopentane. The composite lubricating material provided by the invention passes through MoS 2 The solid lubricating film and the supermolecule gel lubricant cooperate to form a continuous lubricating transfer film on the surface of the friction pair. Therefore, the composite lubricating material provided by the invention has longer effective lubricating life under vacuum or atmospheric conditions. The results of the examples show that the composite lubricating material provided by the invention has the effective lubricating life of more than 5h in a vacuum environment.
Description
Technical Field
The invention belongs to the technical field of space mechanical lubrication, and particularly relates to a composite lubricating material, a preparation method thereof and application thereof in space lubrication.
Background
In the space environment, the space pressure born by the spacecraft in the process of running on the high orbit of the space is 10 -11 Pa, and the space pressure of 10 during its operation on the near-earth orbit -5 ～10 -7 The range of Pa magnitude, the corresponding vacuum degree in the cabin is 10 -4 Pa magnitude, and researches show that in the high vacuum environment, the metal surfaces of two clean mechanical parts which are mutually contacted are very easy to be adhered, and the temperature rise of a contact interface is very high because the frictional heat is difficult to dissipate. High temperature (including ambient temperature rise) and high vacuum (and high contact load) environments are important causes for increased adhesion and frictional wear at the contact interface. It follows that the lubrication requirements for the spatial mechanical friction pair are very strict.
In order to improve the reliability and life of space lubrication, solid-liquid composite lubrication has been used in recent years. The lubricating mode can improve the durability of the sliding friction matching surface, reduce the abrasion of equipment and prolong the service life of the moving machinery. However, because of unstable factors such as volatilization, creep and the like of the liquid lubricant in microgravity and ultrahigh vacuum environment, the solid lubricating film is worn after long-term use, and unfavorable factors such as wear debris and the like are generated, so that lubrication failure is caused.
Disclosure of Invention
In view of this, the invention provides a composite lubricating material, a preparation method thereof and an application thereof in space lubrication. The composite lubricating material provided by the invention has longer effective lubricating life under vacuum or atmospheric conditions.
In order to achieve the above object, the present invention provides the following technical solutions:
the invention provides a composite lubricating material, which comprises MoS 2 A solid lubricant film and a coating disposed on the MoS 2 The supermolecule gel lubricant on the surface of the solid lubricating film is obtained by gelling N-D-glucosyl-L-leucine hexadecyl ester and polyalkyl cyclopentane.
Preferably, the N-D-glucosyl-L-leucine cetyl ester accounts for 0.5-3% of the weight of the supramolecular gel lubricant.
Preferably, the MoS 2 The thickness of the solid lubricating film is 1 to 5 μm.
Preferably, the thickness of the supermolecular gel lubricant is 0.8-2 mm.
Preferably, the preparation method of the supramolecular gel lubricant comprises the following steps:
heating and mixing the N-D-glucosyl-L-leucine hexadecyl ester and polyalkyl cyclopentane to obtain an N-D-glucosyl-L-leucine hexadecyl ester oil solution;
and cooling and gelling the N-D-glucosyl-L-leucine hexadecanoate oil solution to obtain the supermolecular gel lubricant.
Preferably, the heating and mixing temperature is 80-190 ℃, and the heating and mixing heat preservation time is 5-30 min.
The invention provides a preparation method of the composite lubricating material in the technical scheme, which comprises the following steps:
preparing the MoS on the surface of the friction pair by adopting radio frequency sputtering 2 A solid lubricating film;
applying the supramolecular gel lubricant to the MoS 2 And (3) obtaining the composite lubricating material on the surface of the solid lubricating film.
Preferably, MoS is adopted during the radio frequency sputtering 2 The sputtering target material is prepared by using inert gas as working gas, the flow rate of the working gas is 15-30 mL/min, the working pressure is 3-8 Pa, the target power is 80-150W, the modulation period is 35-45, the bias voltage of the friction pair is-65 to-75V, and the radio-frequency sputtering time is 10-15 min.
Preferably, the coating is spin coating, and the glue homogenizing time in the spin coating is 10 s.
The invention provides an application of the composite lubricating material in the technical scheme or the composite lubricating material prepared by the preparation method in the technical scheme in space lubrication.
The invention provides a composite lubricating material, which comprises MoS 2 A solid lubricant film and a coating disposed on the MoS 2 The supermolecule gel lubricant on the surface of the solid lubricating film is obtained by gelling N-D-glucosyl-L-leucine hexadecyl ester and polyalkyl cyclopentane. The composite lubricating material provided by the invention passes through MoS 2 Solid lubricating film andthe synergistic effect of the supermolecule gel lubricant forms a continuous lubrication transfer film on the surface of the friction pair. In the supermolecule gel lubricant, N-D-glucosyl-L-leucine hexadecyl forms a three-dimensional gel network structure through non-covalent interaction, so that the polyalkylcyclopentane is efficiently captured and fixed, the supermolecule gel lubricant has strong creep resistance, the polyalkylcyclopentane lubricating components are prevented from creeping and volatilizing, and the effective lubricating life is prolonged. At the same time, MoS 2 MoS formed by solid lubricating film in friction process 2 The fragments are preserved as additives in the supramolecular gel lubricant as MoS 2 MoS in supramolecular gel lubricants upon depletion of solid lubricant film 2 The fragments can act as a solid lubricating film under the fixation action of the supramolecular gel, so that the effective lubricating life of the composite lubricating material is prolonged. Therefore, the composite lubricating material provided by the invention has longer effective lubricating life under vacuum or atmospheric conditions. The results of the examples show that the composite lubricating material provided by the invention has the effective lubricating life of more than 5h in a vacuum environment.
Drawings
Fig. 1 is a graph of the results of the creeping experiment of the supramolecular gels prepared in examples 2 and 3 under the conditions of ultraviolet irradiation and atomic oxygen irradiation;
FIG. 2 shows MoS prepared on the surface of a friction pair in example 1 of the present invention 2 Electron microscope photomicrograph of solid lubricant film;
FIG. 3 is a diagram showing the gelation evolution of the supramolecular gel in example 1 of the present invention.
Detailed Description
The invention provides a composite lubricating material, which comprises MoS 2 A solid lubricant film and a coating disposed on the MoS 2 The supermolecule gel lubricant on the surface of the solid lubricating film is obtained by gelling N-D-glucosyl-L-leucine hexadecyl ester and polyalkyl cyclopentane.
In the present invention, the starting materials are all commercially available products well known to those skilled in the art, unless otherwise specified.
The composite lubricating material provided by the invention comprises MoS 2 And (3) a solid lubricating film.In the present invention, the MoS 2 The thickness of the solid lubricating film is preferably 1 to 5 μm, more preferably 1.25 to 4 μm, and most preferably 2.5 to 3 μm
The composite lubricating material provided by the invention comprises a lubricating oil layer arranged on the MoS 2 The supermolecule gel lubricant on the surface of the solid lubricating film. In the invention, the thickness of the supramolecular gel lubricant is preferably 0.8-2 mm, and more preferably 1-1.5 mm.
In the present invention, the N-D-glucosyl-L-leucine cetyl ester is preferably 0.5 to 3% by mass of the supramolecular gel lubricant, and in a specific embodiment of the present invention, the N-D-glucosyl-L-leucine cetyl ester is preferably 0.5%, 1% or 3% by mass of the supramolecular gel lubricant.
In the invention, the supermolecular gel lubricant is obtained by gelling N-D-glucosyl-L-leucine cetyl ester and polyalkyl cyclopentane. In the present invention, the preparation method of the supramolecular gel lubricant preferably comprises the steps of:
heating and mixing the N-D-glucosyl-L-leucine hexadecyl ester and polyalkyl cyclopentane to obtain an N-D-glucosyl-L-leucine hexadecyl ester oil solution;
and cooling and gelling the N-D-glucosyl-L-leucine hexadecanoate oil solution to obtain the supermolecular gel lubricant.
The N-D-glucosyl-L-leucine cetyl ester and polyalkylcyclopentane are heated and mixed to obtain N-D-glucosyl-L-leucine cetyl ester oil solution.
In the present invention, the method for preparing N-D-glucosyl-L-leucine hexadecyl ester preferably refers to "Thermoeveribile Gel membranes through Universal superior molecular Assembly of a non-nitrile Surfactant in an a variety of base Lubricating Liquids" (Yu, Q., Fan, M., Li, D., Song, Z., Cai, M., ZHou, F., Liu, W., ACS Applied Materials & Interfaces, 2014,18, 15783-15794).
In a specific embodiment of the present invention, the method for preparing N-D-glucosyl-L-leucine hexadecyl ester is specifically and preferably:
to a 250mL round bottom was added 0.05mol of L-leucine (6.559g), 0.05mol of hexadecanol (12.05g) and 0.06mol of p-toluenesulfonic acid monohydrate (11.4132g), 100mL of toluene was added as a solvent, and the mixture was refluxed overnight using a water separator. After the reaction was completed, the solvent was distilled off under reduced pressure, the oily residue was dissolved in 150mL of chloroform, then saturated sodium carbonate was gradually added dropwise to adjust the pH to neutrality, and the organic phase was collected and dried over anhydrous magnesium sulfate overnight. The organic phase is separated and the solvent is distilled off again, and the residue is dissolved in 200mL of acetone containing 10mL of concentrated hydrochloric acid and frozen to give the corresponding hexadecanol aminoate hydrochloride in white.
The obtained amino acid hexadecanol ester hydrochloride was dissolved again in 200mL of acetone solution, and the solution was frozen again to precipitate a precipitate. The precipitate was then dissolved in 100mL of chloroform, the organic phase was collected by adjusting the pH to 7 with 10% sodium carbonate solution and dried over anhydrous magnesium sulfate overnight, after which the solvent was distilled off under reduced pressure to obtain pure amino acid cetyl esters.
Adding gluconolactone (0.08mol) into 100mL of absolute ethanol solution dissolved with corresponding amino acid cetyl alcohol ester, refluxing for 8 hours, evaporating the solvent to obtain a solid product, dissolving the solid product with hot 1, 4-dioxane, carrying out suction filtration while the solid product is hot, and then adding 1, 4-dioxane and acetonitrile according to the volume ratio of 1: 10 to obtain the final product N-D-glucosyl-L-leucine hexadecyl ester.
In the invention, the heating and mixing temperature is preferably 80-190 ℃, more preferably 120-180 ℃, and most preferably 150-170 ℃. In the invention, the heat preservation time of the heating and mixing is preferably 5-30 min, and more preferably 10-25 min. In the present invention, the heating and mixing are preferably carried out under stirring, and the present invention has no special requirement for the specific implementation process of the stirring.
After obtaining the N-D-glucosyl-L-leucine hexadecane oil solution, the invention cools and gelatinizes the N-D-glucosyl-L-leucine hexadecane oil solution to obtain the supermolecule gel lubricant.
In the present invention, the termination temperature of the cooling gelation is preferably room temperature. In the present invention, the cold gelation may be carried out by allowing the N-D-gluconoyl-L-leucine hexadecanoate oil solution to stand for air cooling. In the invention, at the end of the cooling process of the N-D-glucosyl-L-leucine hexadecanoate oil solution, the N-D-glucosyl-L-leucine hexadecanoate forms a three-dimensional gel network structure through non-covalent interaction, so that the high-efficiency capture and fixation of polyalkylcyclopentane are realized, and the supramolecular gel lubricant is formed.
The composite lubricating material provided by the invention passes through MoS 2 The solid lubricating film and the supermolecule gel lubricant form a continuous lubricating transfer film on the surface of the friction pair under the synergistic action, and have longer effective lubricating life under the vacuum or atmospheric condition.
The invention provides a preparation method of the composite lubricating material in the technical scheme, which comprises the following steps:
preparing the MoS on the surface of the friction pair by adopting radio frequency sputtering 2 A solid lubricating film;
applying the supramolecular gel lubricant to the MoS 2 And (3) obtaining the composite lubricating material on the surface of the solid lubricating film.
The MoS is prepared on the surface of a friction pair by adopting radio frequency sputtering 2 And (3) a solid lubricating film.
In the present invention, the material of the friction pair is preferably a metal or an alloy. The invention has no special requirement on the source of the friction pair.
In a particular embodiment of the invention, said friction pair is particularly preferably an AISI 52100 steel disc.
In the present invention, the friction pair is preferably subjected to a pretreatment, and in the present invention, the pretreatment preferably includes: and washing and surface etching are sequentially carried out. In the invention, the washing solvent is preferably ethanol, the washing is preferably carried out under the condition of ultrasound, and the specific implementation process of the ultrasound is not particularly required. In the invention, the surface etching is preferably carried out by adopting argon plasma, the direct current bias voltage during the surface etching is preferably-500V, and the time for the surface etching is preferably 10-15 min.
In the invention, MoS is preferably adopted in the invention during the radio frequency sputtering 2 As the sputtering target, the working gas is preferably an inert gas, and particularly preferably Ar gas. In the invention, the flow rate of the working gas is preferably 15-30 mL/min, and more preferably 20-25 mL/min. In the invention, the working pressure of the radio frequency sputtering is preferably 3-8 Pa, and more preferably 3.5-6 Pa. In the present invention, the target power is preferably 80 to 150W, more preferably 85 to 120W. In the present invention, the number of modulation cycles is preferably 35 to 45, and more preferably 40. In the invention, the bias voltage of the friction pair is-65V to-75V, and the time of the radio frequency sputtering is 10min to 15 min.
Obtaining the MoS 2 After the solid lubricating film is formed, the supermolecule gel lubricant is coated on the MoS 2 And (3) obtaining the composite lubricating material on the surface of the solid lubricating film.
In the invention, the coating is preferably spin coating, and the glue homogenizing time in the spin coating is preferably 8-15 s, and more preferably 10 s.
The invention provides the application of the composite lubricating material in the technical scheme or the composite lubricating material prepared by the preparation method in the technical scheme in space lubrication.
In the invention, the composite lubricating material is preferably used as a lubricating material of a friction pair in the mechanical lubrication of aerospace.
Compared with a single supramolecular gel lubricant, the composite lubricating material provided by the invention has a lower friction coefficient; compared to MoS alone 2 A solid lubricant film having a longer effective lubricant life; compared with MoS 2 The solid lubricating film-polyalkyl cyclopentane base oil composite material has better radiation resistance under the condition of strong radiation.
The technical solution of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. It is to be understood that the described embodiments are merely exemplary of the invention, and not restrictive of the full scope of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1
To a 250mL round bottom were added 0.05mol of L-leucine (6.559g), 0.05mol of hexadecanol (12.05g) and 0.06mol of p-toluenesulfonic acid monohydrate (11.4132g), 100mL of toluene was added as a solvent, and the mixture was refluxed overnight using a water separator. After the reaction was completed, the solvent was distilled off under reduced pressure, the oily residue was dissolved in 150mL of chloroform, then saturated sodium carbonate was gradually added dropwise to adjust the pH to neutrality, and the organic phase was collected and dried over anhydrous magnesium sulfate overnight. The organic phase was separated and the solvent was again distilled off, the residue was dissolved in 200mL of an acetone solution containing 10mL of concentrated hydrochloric acid and frozen to give the corresponding hexadecanol aminoate hydrochloride in white.
The obtained amino acid hexadecanol ester hydrochloride was dissolved again in 200mL of acetone solution, and the solution was frozen again to precipitate a precipitate. The precipitate was then dissolved in 100mL of chloroform, the organic phase was collected by adjusting the pH to 7 with 10% sodium carbonate solution and dried over anhydrous magnesium sulfate overnight, after which the solvent was distilled off under reduced pressure to obtain pure amino acid cetyl esters.
Adding gluconolactone (0.08mol) into 100mL of anhydrous ethanol solution dissolved with corresponding amino acid hexadecanol ester, refluxing for 8 hours, evaporating the solvent to obtain a solid product, dissolving the solid product with hot 1, 4-dioxane, carrying out suction filtration while the solid product is hot, and then adding 1, 4-dioxane and acetonitrile in a volume ratio of 1: 10 to obtain the final product N-D-glucosyl-L-leucine hexadecyl ester.
Heating N-D-glucosyl-L-leucine cetyl ester and polyalkylcyclopentane to 80 ℃, stirring and mixing for 25min to obtain an N-D-glucosyl-L-leucine cetyl ester oil solution, and cooling to room temperature to obtain the supramolecular gel lubricant, wherein the mass percentage of the N-D-glucosyl-L-leucine cetyl ester in the supramolecular gel lubricant is 0.5%, and the gelation process of the supramolecular gel lubricant is shown in figure 3.
Ultrasonically washing AISI 52100 steel disc with diameter of 24mm with ethanol, placing into a radio frequency sputtering chamber, performing surface etching with argon plasma, wherein the DC bias voltage during surface etching is preferably-500V, and etchingThe time is 10 min. By using MoS 2 As a sputtering target material, Ar gas is working gas, the flow rate is 30mL/min, the working pressure is 8Pa, the target power is 150W, the modulation period is 40, the bias voltage of a friction pair is-65V, the radio-frequency sputtering time is 10min, and MoS is radio-frequency sputtered on the surface of the friction pair 2 Solid lubricating film 2.5 mu m, MoS 2 An electron micrograph of the solid lubricating film is shown in FIG. 2.
Then spin coating is carried out on the MoS 2 Coating a supermolecule gel lubricant on the surface of the solid lubricating film, and homogenizing for 10s to obtain a solid lubricating film arranged on the MoS 2 The thickness of the supermolecule gel lubricant on the surface of the solid lubricating film is 1mm, and the composite lubricating material is obtained.
Example 2
To a 250mL round bottom were added 0.05mol of L-leucine (6.559g), 0.05mol of hexadecanol (12.05g) and 0.06mol of p-toluenesulfonic acid monohydrate (11.4132g), 100mL of toluene was added as a solvent, and the mixture was refluxed overnight using a water separator. After the reaction was completed, the solvent was distilled off under reduced pressure, the oily residue was dissolved in 150mL of chloroform, then saturated sodium carbonate was gradually added dropwise to adjust the pH to neutrality, and the organic phase was collected and dried over anhydrous magnesium sulfate overnight. The organic phase is separated and the solvent is distilled off again, and the residue is dissolved in 200mL of acetone containing 10mL of concentrated hydrochloric acid and frozen to give the corresponding hexadecanol aminoate hydrochloride in white.
The obtained amino acid hexadecanol ester hydrochloride was dissolved again in 200mL of acetone solution, and the solution was frozen again to precipitate a precipitate. The precipitate was then dissolved in 100mL of chloroform, the organic phase was collected by adjusting the pH to 7 with 10% sodium carbonate solution and dried over anhydrous magnesium sulfate overnight, after which the solvent was distilled off under reduced pressure to obtain pure amino acid cetyl esters.
Adding gluconolactone (0.08mol) into 100mL of absolute ethanol solution dissolved with corresponding amino acid cetyl alcohol ester, refluxing for 8 hours, evaporating the solvent to obtain a solid product, dissolving the solid product with hot 1, 4-dioxane, carrying out suction filtration while the solid product is hot, and then adding 1, 4-dioxane and acetonitrile according to the volume ratio of 1: 10 to obtain the final product N-D-glucosyl-L-leucine hexadecyl ester.
Heating N-D-glucosyl-L-leucine cetyl ester and polyalkylcyclopentane to 80 ℃, stirring and mixing for 25min to obtain an N-D-glucosyl-L-leucine cetyl ester oil solution, and cooling to room temperature to obtain the supermolecule gel lubricant, wherein the mass percentage of the N-D-glucosyl-L-leucine cetyl ester in the supermolecule gel lubricant is 1%.
The AISI 52100 steel disc with the diameter of 24mm is ultrasonically washed by ethanol, then is placed into a radio frequency sputtering chamber, argon plasma is adopted for surface etching, the direct current bias voltage during the surface etching is preferably-500V, and the etching time is 10 min. By using MoS 2 As a sputtering target material, Ar gas is working gas, the flow rate is 30mL/min, the working pressure is 8Pa, the target power is 150W, the modulation period is 40, the bias voltage of a friction pair is-65V, the radio-frequency sputtering time is 10min, and MoS is radio-frequency sputtered on the surface of the friction pair 2 Solid lubricant film 5 μm.
Then spin coating is carried out on the MoS 2 Coating a supermolecule gel lubricant on the surface of the solid lubricating film, and homogenizing for 10s to obtain a solid lubricating film arranged on the MoS 2 The thickness of the supermolecule gel lubricant on the surface of the solid lubricating film is 1mm, and the composite lubricating material is obtained.
Example 3
To a 250mL round bottom were added 0.05mol of L-leucine (6.559g), 0.05mol of hexadecanol (12.05g) and 0.06mol of p-toluenesulfonic acid monohydrate (11.4132g), 100mL of toluene was added as a solvent, and the mixture was refluxed overnight using a water separator. After the reaction was completed, the solvent was distilled off under reduced pressure, the oily residue was dissolved in 150mL of chloroform, then saturated sodium carbonate was gradually added dropwise to adjust the pH to neutrality, and the organic phase was collected and dried over anhydrous magnesium sulfate overnight. The organic phase was separated and the solvent was again distilled off, the residue was dissolved in 200mL of an acetone solution containing 10mL of concentrated hydrochloric acid and frozen to give the corresponding hexadecanol aminoate hydrochloride in white.
The obtained amino acid hexadecanol ester hydrochloride was dissolved again in 200mL of acetone solution, and the solution was frozen again to precipitate a precipitate. The precipitate was then dissolved in 100mL of chloroform, the organic phase was collected by adjusting the pH to 7 with 10% sodium carbonate solution and dried over night over anhydrous magnesium sulfate, after which the solvent was distilled off under reduced pressure to obtain the pure amino acid hexadecanol ester.
Adding gluconolactone (0.08mol) into 100mL of absolute ethanol solution dissolved with corresponding amino acid cetyl alcohol ester, refluxing for 8 hours, evaporating the solvent to obtain a solid product, dissolving the solid product with hot 1, 4-dioxane, carrying out suction filtration while the solid product is hot, and then adding 1, 4-dioxane and acetonitrile according to the volume ratio of 1: 10 to obtain the final product N-D-glucosyl-L-leucine hexadecyl ester.
Heating N-D-glucosyl-L-leucine cetyl ester and polyalkylcyclopentane to 80 ℃, stirring and mixing for 25min to obtain an N-D-glucosyl-L-leucine cetyl ester oil solution, and cooling to room temperature to obtain the supramolecular gel lubricant, wherein the mass percent of the N-D-glucosyl-L-leucine cetyl ester in the supramolecular gel lubricant is 3%.
The AISI 52100 steel disc with the diameter of 24mm is ultrasonically washed by ethanol, then is placed into a radio frequency sputtering chamber, argon plasma is adopted for surface etching, the direct current bias voltage during the surface etching is preferably-500V, and the etching time is 10 min. By using MoS 2 As a sputtering target material, Ar gas is working gas, the flow rate is 30mL/min, the working pressure is 8Pa, the target power is 150W, the modulation period is 40, the bias voltage of a friction pair is-65V, the radio-frequency sputtering time is 10min, and MoS is radio-frequency sputtered on the surface of the friction pair 2 The solid lubricating film is 5 mu m.
Then spin coating is carried out on the MoS 2 Coating a supermolecule gel lubricant on the surface of the solid lubricating film, and homogenizing for 10s to obtain a solid lubricating film arranged on the MoS 2 And the thickness of the supramolecular gel lubricant on the surface of the solid lubricating film is 1mm, so that the composite lubricating material is obtained.
Test example 1
The lubricating performance of the composite lubricating material provided by the invention is tested by using a simulated vacuum rotary friction testing machine. Wherein, the friction couple adopts a ball-disk contact form, the material is GCr15 bearing steel, and the diameter of the steel ball is 8 mm; under the condition of applying a certain normal load, the steel ball rotationally slides according to a set frequency, and the lubricating property of the lubricating material is represented by measuring the effective lubricating life in the relative sliding process of the ball and the disc. The specific experimental conditions were as follows, vacuum friction: vacuum degree: 6.3X 10 -3 Pa; rotating speed: 1000 rpm; radius of rotation: 5 mm; the temperature was 20 ℃. Under the atmospheric environment: laboratory air humidity: 30% ± 5% RH; rotating speed: 1000 revolutions per minute; radius of rotation: 5 mm; room temperature 20 ℃. The lubricating materials are respectively MoS 2 Solid films, polyalkylcyclopentanes (MACs oils) and the composite lubricating material provided in example 1 of the present invention.
(1)MoS 2 Friction test of solid film and composite lubricating material provided in example 1 of the present invention under vacuum: vacuum degree: 6.3X 10 -3 Pa; rotating speed: 1000 rpm; loading: 5N; radius of rotation: 5 mm; room temperature 20 ℃. The lubrication life of both is shown in Table 1.
TABLE 1MoS 2 Solid film and service life of composite lubricating material provided by embodiment of the invention under vacuum condition
| Item | MoS 2 Solid film | Example composite lubricating Material |
| Effective lubrication life | 3.6 hours | >5 hours |
(2)MoS 2 Friction experiments of solid films and the composite lubricating material provided in example 1 of the present invention under atmospheric conditions: 30% ± 5% RH; rotating speed: 1000 rpm; load: 5N; radius of rotation: 5 mm; the temperature was 20 ℃. The lubrication life of both is shown in Table 2.
TABLE 2MoS 2 Solid film and service life of composite lubricating material provided by embodiment of the invention under atmospheric conditions
| Item | MoS 2 Solid film | Example composite lubricating Material |
| Effective lubrication life | 2.6 hours | >5 hours |
(3)MoS 2 Friction test of solid film and composite lubricating material provided in example 1 of the present invention under vacuum: 30% ± 5% RH; rotating speed: 1000 rpm; loading: 10N; radius of rotation: 5 mm; room temperature 20 ℃. The lubrication life of both is shown in Table 3.
TABLE 3MoS 2 Solid film and service life of composite lubricating material provided by embodiment of the invention under vacuum condition
| Item | MoS 2 Solid film | Example composite lubricating Material |
| Effective lubrication life | 1.82 hours | >5 hours |
(4)MoS 2 Friction experiments of solid films and the composite lubricating material provided in example 1 of the present invention under atmospheric conditions: 30% ± 5% RH; rotating speed: 1000 rpm; loading: 10N; radius of rotation: 5 mm; room temperature 20 ℃. The lubrication life of both is shown in Table 4.
TABLE 4MoS 2 Solid film and service life of composite lubricating material provided by embodiment of the invention under atmospheric conditions
| Item | MoS 2 Solid film | Example composite lubricating Material |
| Effective lubrication life | 1.145 hours | >5 hours |
Test example 2
The supramolecular gel lubricants prepared in examples 2 and 3 and polyalkylcyclopentanes were applied in equal mass to the sputtered MoS using polyalkylcyclopentanes (MACs oil) as a comparative example 2 The surfaces of the friction pair of the solid lubricating film are irradiated for 4 hours under the conditions of ultraviolet irradiation (UV) and atomic oxygen irradiation (AO) respectively under the vacuum condition, and the supramolecular gel lubricant and polyalkyl cyclopentane prepared in the example 2 and the example 3 are observed in MoS 2 The creeping condition of the surface of the solid lubricant film is shown in FIG. 1, and it can be seen from FIG. 1 that the supramolecular gel lubricants prepared in examples 2 and 3 of the present invention are free of creeping phenomenon compared to polyalkylcyclopentaneThe creeping is small under ultraviolet irradiation or atomic oxygen irradiation, which shows that the supermolecule gel is used for replacing polyalkyl cyclopentane, and the supermolecule gel has better anti-irradiation performance.
From the above test examples, it can be seen that the composite lubricating material provided in embodiment 1 of the present invention has a longer effective lubricating life in aerospace applications.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.
Claims (10)
1. A composite lubricating material is characterized by comprising MoS 2 A solid lubricant film and a coating disposed on the MoS 2 The supermolecule gel lubricant on the surface of the solid lubricating film is obtained by gelling N-D-glucosyl-L-leucine hexadecyl ester and polyalkyl cyclopentane.
2. The composite lubricating material of claim 1, wherein the N-D-glucosyl-L-leucine cetyl ester is present in an amount of 0.5-3% by weight of the supramolecular gel lubricant.
3. The composite lubricating material of claim 1, wherein the MoS is 2 The thickness of the solid lubricating film is 1 to 5 μm.
4. The composite lubricating material according to claim 1 or 3, wherein the supramolecular gel lubricant has a thickness of 0.8 to 2 mm.
5. The composite lubricating material of claim 1, wherein the supramolecular gel lubricant is prepared by a process comprising the steps of:
heating and mixing the N-D-glucosyl-L-leucine cetyl ester and polyalkylcyclopentane to obtain an N-D-glucosyl-L-leucine cetyl ester oil solution;
and cooling and gelling the N-D-glucosyl-L-leucine hexadecanoate oil solution to obtain the supermolecular gel lubricant.
6. The composite lubricating material according to claim 5, wherein the temperature of the heating and mixing is 80 to 190 ℃, and the holding time of the heating and mixing is 5 to 30 min.
7. A method of producing the composite lubricating material of any one of claims 1 to 6, characterized by comprising the steps of:
preparing the MoS on the surface of the friction pair by adopting radio frequency sputtering 2 A solid lubricating film;
applying the supramolecular gel lubricant to the MoS 2 And (3) obtaining the composite lubricating material on the surface of the solid lubricating film.
8. The method according to claim 7, wherein MoS is used for the RF sputtering 2 The sputtering target is made of inert gas as working gas, the flow rate of the working gas is 15-30 mL/min, the working pressure is 3-8 Pa, the target power is 80-150W, the modulation period is 35-45, the bias voltage of the friction pair is-65 to-75V, and the radio frequency sputtering time is 10-15 min.
9. The preparation method according to claim 7, wherein the coating is spin coating, and the time for the spin coating to be uniform is 8-15 s.
10. Use of the composite lubricating material according to any one of claims 1 to 6 or the composite lubricating material prepared by the preparation method according to any one of claims 7 to 9 in space lubrication.
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