CN116254144A - Liquid lubricant for diamond-like carbon film - Google Patents
Liquid lubricant for diamond-like carbon film Download PDFInfo
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- CN116254144A CN116254144A CN202211089609.1A CN202211089609A CN116254144A CN 116254144 A CN116254144 A CN 116254144A CN 202211089609 A CN202211089609 A CN 202211089609A CN 116254144 A CN116254144 A CN 116254144A
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- 239000010687 lubricating oil Substances 0.000 title claims abstract description 42
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 title abstract description 7
- 229910052799 carbon Inorganic materials 0.000 title abstract description 6
- 230000001050 lubricating effect Effects 0.000 claims abstract description 27
- 239000000654 additive Substances 0.000 claims abstract description 21
- 239000000314 lubricant Substances 0.000 claims abstract description 21
- 230000000996 additive effect Effects 0.000 claims abstract description 20
- 125000003178 carboxy group Chemical group [H]OC(*)=O 0.000 claims abstract description 8
- 125000002887 hydroxy group Chemical group [H]O* 0.000 claims abstract description 8
- 238000005461 lubrication Methods 0.000 claims description 19
- 239000000463 material Substances 0.000 claims description 15
- ALRHLSYJTWAHJZ-UHFFFAOYSA-N 3-hydroxypropionic acid Chemical compound OCCC(O)=O ALRHLSYJTWAHJZ-UHFFFAOYSA-N 0.000 claims description 12
- 238000000034 method Methods 0.000 claims description 12
- KRKNYBCHXYNGOX-UHFFFAOYSA-N citric acid Chemical compound OC(=O)CC(O)(C(O)=O)CC(O)=O KRKNYBCHXYNGOX-UHFFFAOYSA-N 0.000 claims description 9
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 9
- 229910000851 Alloy steel Inorganic materials 0.000 claims description 6
- 229910000975 Carbon steel Inorganic materials 0.000 claims description 6
- AEMRFAOFKBGASW-UHFFFAOYSA-N Glycolic acid Chemical compound OCC(O)=O AEMRFAOFKBGASW-UHFFFAOYSA-N 0.000 claims description 6
- 239000010962 carbon steel Substances 0.000 claims description 6
- JVTAAEKCZFNVCJ-UHFFFAOYSA-N lactic acid Chemical compound CC(O)C(O)=O JVTAAEKCZFNVCJ-UHFFFAOYSA-N 0.000 claims description 6
- 229940071264 lithium citrate Drugs 0.000 claims description 6
- WJSIUCDMWSDDCE-UHFFFAOYSA-K lithium citrate (anhydrous) Chemical compound [Li+].[Li+].[Li+].[O-]C(=O)CC(O)(CC([O-])=O)C([O-])=O WJSIUCDMWSDDCE-UHFFFAOYSA-K 0.000 claims description 6
- HQVNEWCFYHHQES-UHFFFAOYSA-N silicon nitride Chemical compound N12[Si]34N5[Si]62N3[Si]51N64 HQVNEWCFYHHQES-UHFFFAOYSA-N 0.000 claims description 6
- 229910052581 Si3N4 Inorganic materials 0.000 claims description 5
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims description 5
- 229910003481 amorphous carbon Inorganic materials 0.000 claims description 5
- 238000000151 deposition Methods 0.000 claims description 5
- 239000010703 silicon Substances 0.000 claims description 5
- 229910052710 silicon Inorganic materials 0.000 claims description 5
- 239000000758 substrate Substances 0.000 claims description 4
- RKTYLMNFRDHKIL-UHFFFAOYSA-N copper;5,10,15,20-tetraphenylporphyrin-22,24-diide Chemical compound [Cu+2].C1=CC(C(=C2C=CC([N-]2)=C(C=2C=CC=CC=2)C=2C=CC(N=2)=C(C=2C=CC=CC=2)C2=CC=C3[N-]2)C=2C=CC=CC=2)=NC1=C3C1=CC=CC=C1 RKTYLMNFRDHKIL-UHFFFAOYSA-N 0.000 claims description 3
- 229910003460 diamond Inorganic materials 0.000 claims description 3
- 239000010432 diamond Substances 0.000 claims description 3
- 239000010408 film Substances 0.000 claims description 3
- 239000004310 lactic acid Substances 0.000 claims description 3
- 235000014655 lactic acid Nutrition 0.000 claims description 3
- 238000006243 chemical reaction Methods 0.000 abstract description 6
- LYCAIKOWRPUZTN-UHFFFAOYSA-N Ethylene glycol Chemical compound OCCO LYCAIKOWRPUZTN-UHFFFAOYSA-N 0.000 description 16
- 230000000052 comparative effect Effects 0.000 description 8
- 239000007864 aqueous solution Substances 0.000 description 4
- 229920013639 polyalphaolefin Polymers 0.000 description 4
- 239000000243 solution Substances 0.000 description 4
- 239000000126 substance Substances 0.000 description 4
- 229910000831 Steel Inorganic materials 0.000 description 3
- 239000010959 steel Substances 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- 238000005299 abrasion Methods 0.000 description 2
- 238000005229 chemical vapour deposition Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- WGCNASOHLSPBMP-UHFFFAOYSA-N hydroxyacetaldehyde Natural products OCC=O WGCNASOHLSPBMP-UHFFFAOYSA-N 0.000 description 2
- -1 lithium citrate-ethylene glycol Chemical compound 0.000 description 2
- 239000003879 lubricant additive Substances 0.000 description 2
- 230000002035 prolonged effect Effects 0.000 description 2
- ZJKIBABOSPFBNO-OWOJBTEDSA-N 3-Hydroxypropenoate Chemical compound O\C=C\C(O)=O ZJKIBABOSPFBNO-OWOJBTEDSA-N 0.000 description 1
- ZOKXTWBITQBERF-UHFFFAOYSA-N Molybdenum Chemical compound [Mo] ZOKXTWBITQBERF-UHFFFAOYSA-N 0.000 description 1
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 description 1
- 229910021389 graphene Inorganic materials 0.000 description 1
- 230000036571 hydration Effects 0.000 description 1
- 238000006703 hydration reaction Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229910052750 molybdenum Inorganic materials 0.000 description 1
- 239000011733 molybdenum Substances 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 239000003921 oil Substances 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
- 239000011701 zinc Substances 0.000 description 1
- 229910052725 zinc Inorganic materials 0.000 description 1
Images
Classifications
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C16/00—Chemical coating by decomposition of gaseous compounds, without leaving reaction products of surface material in the coating, i.e. chemical vapour deposition [CVD] processes
- C23C16/22—Chemical coating by decomposition of gaseous compounds, without leaving reaction products of surface material in the coating, i.e. chemical vapour deposition [CVD] processes characterised by the deposition of inorganic material, other than metallic material
- C23C16/26—Deposition of carbon only
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
- C10M173/00—Lubricating compositions containing more than 10% water
- C10M173/02—Lubricating compositions containing more than 10% water not containing mineral or fatty oils
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C16/00—Chemical coating by decomposition of gaseous compounds, without leaving reaction products of surface material in the coating, i.e. chemical vapour deposition [CVD] processes
- C23C16/56—After-treatment
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
- C10M2201/00—Inorganic compounds or elements as ingredients in lubricant compositions
- C10M2201/02—Water
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
- C10M2207/00—Organic non-macromolecular hydrocarbon compounds containing hydrogen, carbon and oxygen as ingredients in lubricant compositions
- C10M2207/02—Hydroxy compounds
- C10M2207/021—Hydroxy compounds having hydroxy groups bound to acyclic or cycloaliphatic carbon atoms
- C10M2207/022—Hydroxy compounds having hydroxy groups bound to acyclic or cycloaliphatic carbon atoms containing at least two hydroxy groups
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
- C10M2207/00—Organic non-macromolecular hydrocarbon compounds containing hydrogen, carbon and oxygen as ingredients in lubricant compositions
- C10M2207/10—Carboxylix acids; Neutral salts thereof
- C10M2207/12—Carboxylix acids; Neutral salts thereof having carboxyl groups bound to acyclic or cycloaliphatic carbon atoms
- C10M2207/121—Carboxylix acids; Neutral salts thereof having carboxyl groups bound to acyclic or cycloaliphatic carbon atoms having hydrocarbon chains of seven or less carbon atoms
- C10M2207/124—Carboxylix acids; Neutral salts thereof having carboxyl groups bound to acyclic or cycloaliphatic carbon atoms having hydrocarbon chains of seven or less carbon atoms containing hydroxy groups; Ethers thereof
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10N—INDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS
- C10N2030/00—Specified physical or chemical properties which is improved by the additive characterising the lubricating composition, e.g. multifunctional additives
- C10N2030/06—Oiliness; Film-strength; Anti-wear; Resistance to extreme pressure
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- Chemical & Material Sciences (AREA)
- General Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Organic Chemistry (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Inorganic Chemistry (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Lubricants (AREA)
Abstract
The invention belongs to the technical field of lubricants, and particularly relates to a liquid lubricant for a diamond-like carbon film. The invention provides a liquid lubricant for a diamond-like film, which comprises a basic lubricant and a lubricating additive, wherein the lubricating additive contains carboxyl and hydroxyl in the molecule. The lubricating additive containing hydroxyl and carboxyl can be subjected to tribochemical reaction with the diamond-like film to form a friction reaction film, so that the friction coefficient and the wear rate of the diamond-like film are effectively reduced, and the friction coefficient is reduced by more than 90%; the liquid lubricant for the diamond-like film provided by the invention has good lubricating performance and wide application range, and has important significance for advancing the deep application of the diamond-like film in tribology.
Description
Technical Field
The invention belongs to the technical field of lubricants, and particularly relates to a liquid lubricant for a diamond-like carbon film.
Background
Friction and wear are widely present in various types of mechanical systems. It is counted that frictional wear consumes about 1/3 of the primary energy worldwide and results in failure of nearly 80% of the mechanical parts, and that more than 50% of the mechanical equipment incidents result from lubrication failure or excessive wear. At present, the requirements of fields such as machinery, transportation, aerospace and the like on friction control are continuously improved. Therefore, the lubrication antifriction and antifriction technology is studied, the friction state of a mechanical system is improved, friction is reduced, abrasion is controlled, and the lubrication antifriction and antifriction technology has important significance for improving the utilization rate of resources and reducing the consumption of materials.
Disclosure of Invention
The present invention has been made based on the findings and knowledge of the inventors regarding the following facts and problems:
diamond-like carbon (DLC) films have excellent properties such as abrasion resistance, low friction, chemical stability, etc., and are widely used in tribology.
At present, ultra-low friction can be realized on DLC under the vacuum or nitrogen condition, but friction cannot be effectively reduced under the atmospheric environment. In order to solve the above problems, the friction coefficient of DLC can be reduced under atmospheric conditions by using a liquid lubricant, for example, by using a conventional lubricant such as Polyalphaolefin (PAO), and the friction coefficient is reduced compared with the friction coefficient under dry friction conditions, but the absolute value of the friction coefficient is still larger.
At present, when the DLC is lubricated by using the traditional lubricant, the friction coefficient is high, and high-efficiency lubrication is difficult to realize. In a water-based lubrication system, ultra-low friction can be realized by means of two-dimensional materials such as graphene oxide, but the two-dimensional materials have poor dispersibility and an unstable ultra-low friction state; in addition, the two-dimensional material has high preparation cost, and the lubrication technology cost can be increased. Under oil-based lubrication systems, conventional lubricants such as Polyalphaolefins (PAOs) have relatively high coefficients of friction for DLC lubrication, and even with additives such as molybdenum dialkyldithioformate (MoDTC) or zinc dialkyldithiophosphate (ZDDP) they are not effective in reducing the coefficient of friction and wear rate.
The present invention aims to solve at least one of the technical problems in the related art to some extent. To this end, embodiments of the present invention propose a liquid lubricant for diamond-like carbon films, with which lubrication of DLC films can achieve a reduction in friction coefficient of more than 90%.
A liquid lubricant for a diamond-like film according to an embodiment of the present invention includes a base lubricant and a lubricant additive including carboxyl groups and hydroxyl groups in a molecule.
The liquid lubricant for the diamond-like film provided by the embodiment of the invention has the advantages and technical effects that 1, in the embodiment of the invention, the liquid lubricant comprises the basic lubricant and the lubricating additive, and the lubricating additive comprising carboxyl and hydroxyl can be subjected to tribochemical reaction with the diamond-like film to form a friction reaction film, so that the ultra-low friction coefficient and wear rate are realized on the diamond-like film, the lubricating efficiency of the diamond-like film is improved, and the service life of the diamond-like film is prolonged; 2. in the embodiment of the invention, the liquid lubricant has universality and very wide application range, and has important significance for advancing the deep application of the diamond-like film in tribology.
In some embodiments, the lubricating additive is soluble in water.
In some embodiments, the lubricating additive comprises at least one of 3-hydroxypropionic acid, lactic acid, glycolic acid, citric acid, lithium citrate.
In some embodiments, the liquid lubricant has a lubrication additive ratio of 0.1 to 30wt.%.
In some embodiments, the base lubricant is a water-based lubricant.
The embodiment of the invention also provides a lubrication method of the diamond-like film, which comprises the following steps:
(1) Depositing a diamond-like film on a substrate material;
(2) And (3) adopting the liquid lubricant to lubricate the diamond-like film.
The lubricating method of the diamond-like film has the advantages and technical effects that the lubricating method of the diamond-like film is convenient to use and convenient to operate, and the liquid lubricant is directly smeared on the surface of the diamond-like film for lubrication.
In some embodiments, in the step (1), the base material comprises at least one of silicon wafer, carbon steel, alloy steel.
In some embodiments, in the step (1), the diamond-like film includes at least one of an amorphous carbon film, a tetragonal diamond film, a metal-doped diamond-like film, and a non-metal-doped diamond-like film.
In some embodiments, the material paired with the diamond-like film comprises at least one of diamond-like film, carbon steel, alloy steel, silicon nitride.
Drawings
FIG. 1 is a plot of the coefficient of friction of a DLC/bearing steel friction pair over time for dry friction in comparative example 1 and aqueous 3-hydroxy acrylic acid in example 1;
FIG. 2 is a plot of the coefficient of friction of a DLC/silicon nitride friction pair over time for an aqueous solution of lithium citrate-ethylene glycol in example 2 and an aqueous solution of ethylene glycol in comparative example 2.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings. The embodiments described below by referring to the drawings are illustrative and intended to explain the present invention and should not be construed as limiting the invention.
The liquid lubricant for the diamond-like film comprises a base lubricant and a lubricating additive, wherein the lubricating additive comprises carboxyl and hydroxyl in a molecule.
The liquid lubricant for the diamond-like film comprises the basic lubricant and the lubricating additive, wherein the lubricating additive containing carboxyl and hydroxyl can be subjected to a tribochemical reaction with the diamond-like film to form a friction reaction film, so that the ultra-low friction coefficient and the wear rate are realized on the diamond-like film, the lubricating efficiency of the diamond-like film is improved, and the service life of the diamond-like film is prolonged; the liquid lubricant has good lubricating effect and wide application range, and has important significance for promoting the deep application of the diamond-like film in tribology.
In some embodiments, preferably, the lubricating additive is soluble in water. Further preferably, the lubricating additive includes, but is not limited to, 3-hydroxypropionic acid, lactic acid, glycolic acid, citric acid, or lithium citrate. In the embodiment of the invention, the preferable substance can form a chemical adsorption film through carboxyl and a diamond-like film, and the hydroxyl end can be combined with water molecules to form a hydration sheath structure, so that the friction coefficient is effectively reduced.
In some embodiments, preferably, the liquid lubricant has a lubrication additive ratio of 0.1-30wt.%. According to the embodiment of the invention, the proportion of each substance in the liquid lubricant is controlled, so that the comprehensive performance of the liquid lubricant is adjusted, and the relative balance between the price and the lubrication efficiency is achieved.
In some embodiments, preferably, the base lubricant is a water-based lubricant including, but not limited to, water or glycol.
In some embodiments, preferably, the method of preparing the liquid lubricant comprises the steps of: the lubricant additive was dissolved in the base lubricant and sonicated at room temperature for 10 minutes to obtain the liquid lubricant.
The embodiment of the invention also provides a lubrication method of the diamond-like film, which is characterized by comprising the following steps:
(1) Depositing a diamond-like film on a substrate material;
(2) And (3) adopting the liquid lubricant to lubricate the diamond-like film.
In the embodiment of the invention, the liquid lubricant is directly added on the surface of the diamond-like film for lubrication, so that the lubrication method is convenient to use and convenient to operate.
In some embodiments, preferably, in the step (1), the substrate material includes, but is not limited to, silicon wafer, carbon steel or alloy steel. Further preferably, in the step (1), the diamond-like film includes, but is not limited to, an amorphous carbon film, a tetragonal diamond film, a metal-doped diamond-like film, or a non-metal-doped diamond-like film.
In some embodiments, preferably, the material paired with the diamond-like film includes, but is not limited to, diamond-like film, carbon steel, alloy steel, or silicon nitride. The friction pair is a friction system formed by friction generated by two objects in contact, and the matched pair is made of an object which is rubbed with the DLC.
The invention will now be illustrated with reference to specific examples.
Example 1
(1) Depositing an amorphous carbon film (a-C) having a thickness of about 1 μm on a silicon wafer by chemical vapor deposition;
(2) Taking an aqueous solution of 3-hydroxy propionic acid as a liquid lubricant, wherein the content of 3-hydroxy propionic acid in the liquid lubricant is 30wt.%;
(3) And (3) lubricating the DLC by using the liquid lubricant prepared in the step (2), wherein the lubricated DLC and bearing steel form a friction pair.
Example 2
(1) Depositing an amorphous carbon film (a-C) having a thickness of about 1 μm on a silicon wafer by chemical vapor deposition;
(2) Mixing lithium citrate with an aqueous glycol solution to form a liquid lubricant, wherein the content of the lithium citrate in the liquid lubricant is 1wt.%;
(3) And (3) lubricating the DLC by using the liquid lubricant prepared in the step (2), wherein the lubricated DLC and silicon nitride form a friction pair.
Comparative example 1
The same procedure as in example 1 was followed except that the lubricant obtained in step (2) was not used for lubrication.
Comparative example 2
The same procedure as in example 2 was followed except that an aqueous ethylene glycol solution was used alone as a lubricant.
Experimental example
The friction coefficients of the friction pairs in examples 1 to 2 and comparative examples 1 to 2 were tested by a tribological test under the following conditions: tribological tests were carried out at room temperature, using bearing steel balls with a diameter of 10mm, a rotational speed of 200rpm, a rotational radius of 4mm and an applied phase load of 3N in example 1 and comparative example 1; in example 2 and comparative example 2, silicon nitride balls having a diameter of 6mm were used at a rotation speed of 180rpm, a rotation radius of 4mm, and a phase load of 5N was applied; the results are shown in FIGS. 1 to 2.
While DLC was lubricated with an aqueous solution of 3-hydroxypropionic acid in example 1, the coefficient of friction was 0.004, in comparative example 1, the coefficient of friction was 0.15 when dry friction was performed without adding a lubricant, in contrast to the 95% or more reduction in the coefficient of friction with the liquid lubricant of example 1.
In example 2, the DLC was lubricated with a mixture of lithium citrate and an aqueous ethylene glycol solution, the coefficient of friction was 0.001, while the DLC was lubricated with an aqueous ethylene glycol solution alone, the coefficient of friction was 0.015, in contrast to 93% reduction in the coefficient of friction with the liquid lubricant of example 2.
The liquid lubricant can reduce the friction coefficient to 0.001-0.006, and can reduce the friction coefficient by more than 50%.
For purposes of this disclosure, the terms "one embodiment," "some embodiments," "example," "a particular example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, schematic representations of the above terms are not necessarily directed to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, the different embodiments or examples described in this specification and the features of the different embodiments or examples may be combined and combined by those skilled in the art without contradiction.
While the above embodiments have been shown and described, it should be understood that the above embodiments are illustrative and not to be construed as limiting the invention, and that variations, modifications, alternatives, and variations of the above embodiments may be made by those of ordinary skill in the art without departing from the scope of the invention.
Claims (9)
1. A liquid lubricant for a diamond-like film, the liquid lubricant comprising a base lubricant and a lubricating additive, the lubricating additive comprising carboxyl and hydroxyl groups in a molecule.
2. The liquid lubricant for diamond-like films according to claim 1, wherein the lubrication additive is soluble in water.
3. The liquid lubricant for diamond-like film according to claim 2, wherein the lubricating additive comprises at least one of 3-hydroxypropionic acid, lactic acid, glycolic acid, citric acid, and lithium citrate.
4. A liquid lubricant for diamond-like film according to any one of claims 1 to 3, wherein the ratio of the lubricating additive in the liquid lubricant is 0.1 to 30wt%.
5. The liquid lubricant for diamond-like film according to claim 1, wherein the base lubricant is a water-based lubricant.
6. The lubricating method of the diamond-like film is characterized by comprising the following steps of:
(1) Depositing a diamond-like film on a substrate material;
(2) The diamond-like film is lubricated with the liquid lubricant according to any one of claims 1 to 5.
7. The method of lubricating a diamond-like film according to claim 6, wherein in the step (1), the base material comprises at least one of silicon wafer, carbon steel, and alloy steel.
8. The method according to claim 6, wherein in the step (1), the diamond-like film comprises at least one of an amorphous carbon film, a tetragonal diamond film, a metal-doped diamond-like film, and a non-metal-doped diamond-like film.
9. The method of claim 6, wherein the material associated with the diamond-like film comprises at least one of diamond-like film, carbon steel, alloy steel, and silicon nitride.
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