CN114635115B - Antifriction and wear-resistant coating with strong synergistic effect with lubricating oil friction modification additive - Google Patents

Antifriction and wear-resistant coating with strong synergistic effect with lubricating oil friction modification additive Download PDF

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CN114635115B
CN114635115B CN202210278584.3A CN202210278584A CN114635115B CN 114635115 B CN114635115 B CN 114635115B CN 202210278584 A CN202210278584 A CN 202210278584A CN 114635115 B CN114635115 B CN 114635115B
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wear
resistant coating
coating
modtc
antifriction
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CN114635115A (en
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田耘
杨东杰
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Shandong University
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    • 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
    • C23C14/00—Coating by vacuum evaporation, by sputtering or by ion implantation of the coating forming material
    • C23C14/22—Coating by vacuum evaporation, by sputtering or by ion implantation of the coating forming material characterised by the process of coating
    • C23C14/34—Sputtering
    • C23C14/35—Sputtering by application of a magnetic field, e.g. magnetron sputtering
    • 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
    • C23C14/00—Coating by vacuum evaporation, by sputtering or by ion implantation of the coating forming material
    • C23C14/0021—Reactive sputtering or evaporation
    • C23C14/0036—Reactive sputtering
    • 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
    • C23C14/00—Coating by vacuum evaporation, by sputtering or by ion implantation of the coating forming material
    • C23C14/06—Coating by vacuum evaporation, by sputtering or by ion implantation of the coating forming material characterised by the coating material
    • C23C14/0641—Nitrides
    • 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
    • C23C14/00—Coating by vacuum evaporation, by sputtering or by ion implantation of the coating forming material
    • C23C14/06—Coating by vacuum evaporation, by sputtering or by ion implantation of the coating forming material characterised by the coating material
    • C23C14/0676—Oxynitrides
    • 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
    • C23C14/00—Coating by vacuum evaporation, by sputtering or by ion implantation of the coating forming material
    • C23C14/58—After-treatment

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  • Chemical Kinetics & Catalysis (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
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Abstract

The invention discloses a preparation method and application of a wear-resistant coating with strong synergistic effect with a lubricating oil friction modification additive MoDTC. The method comprises the steps of depositing a hard wear-resistant coating on a substrate, or enabling the substrate to meet certain mechanical properties through surface treatment and heat treatment, and then depositing a Ti-O-N coating on the surface of the substrate to obtain the antifriction wear-resistant coating. The Ti-O-N coating provided by the invention has strong synergistic interaction with the friction modifier MoDTC, and promotes MoS in the MoDTC friction film 2 The friction reducing efficiency of the friction modifying additive MoDTC in the lubricating oil is enhanced.

Description

Antifriction and wear-resistant coating with strong synergistic effect with lubricating oil friction modification additive
Technical Field
The invention relates to the technical field of antifriction and wear-resistant coatings, in particular to an antifriction and wear-resistant coating which has strong synergistic interaction with a lubricating oil friction modification additive.
Background
The information in this background section is only for enhancement of understanding of the general background of the invention and is not necessarily to be construed as an admission or any form of suggestion that this information forms the prior art that is already known to a person of ordinary skill in the art.
The friction reducing and wear resisting coating is coated on the surface of the mechanical moving part and the lubricating oil is used to greatly improve the tribological performance of the mechanical part. Molybdenum dialkyldithiocarbamates (MoDTC) are one type of friction modifying additive commonly used in lubricating oils. MoDTC forms friction reducing film on the surface of mechanical moving parts, and the friction reducing efficiency of the friction reducing film is influenced by the components, especially the proportion of Mo-containing compounds in the friction film. MoS in Friction film 2 The increase in content is advantageous for obtaining a lower coefficient of friction, whereas MoO 3 Or FeMoO 4 Is not favorable for reducing the friction coefficient, and MoO 3 Or FeMoO 4 Wear of the mechanically moving parts and of the surface coatings is exacerbated under certain conditions.
The decomposition of the MoDTC and the formation of a friction film thereof can be obviously influenced by the service environment of mechanical moving parts and friction pair materials, and further influence the decomposition degree and the proportion of decomposition products. After the components of the wear-resistant coating are modified, the composition of the MoDTC friction film on the surface of the coating can be optimized, and the friction reducing active component MoS in the friction film is improved 2 Thereby enhancing the synergistic effect between the antifriction wear-resistant coating and the MoDTC and reducing the wear and friction of the surface of the mechanical moving part coated with the coating. Therefore, the component of the antifriction and wear-resistant coating and the synergistic action behavior of the friction modifier MoDTC are regulated to improve the coating of the antifriction and wear-resistant coatingThe mechanical moving parts of (1) oil-lubricate the effective way of tribological performance.
Disclosure of Invention
MoDTC is used as a common lubricating oil friction modification additive, has good antifriction performance for a traditional steel/steel friction pair, and can reduce the friction coefficient of the steel/steel friction pair to 0.04. However, moDTC has a more complicated decomposition process, and is easily affected by the surface hardness of the friction pair and the chemical state of the surface of the friction pair. The plated hard wear-resistant coating can meet the hardness requirement of the surface of a friction pair, reduce surface wear, provide a stable attached surface for a MoDTC friction film, and the high hardness of the surface is favorable for improving the coverage rate of the MoDTC friction film, so that the friction reduction efficiency of the MoDTC is improved. However, the complicated decomposition process of the MoDTC makes the interaction between the MoDTC and the coating uncertain, so that the friction reducing efficiency of the MoDTC is reduced and even the tribological performance of the friction pair is affected, for example, the MoDTC can generate adverse tribochemical reaction with diamond-like carbon coating (DLC), and the abrasion of the DLC coating is remarkably increased. Aiming at the problems, the invention provides an antifriction wear-resistant coating which has strong synergistic effect with MoDTC. According to the experimental result, the MoDTC and the Ti-O-N coating have stronger tribochemical reaction interaction, and the Ti-O-N coating can inhibit MoO in the MoDTC friction film through the tribochemical reaction 3 /FeMoO 4 The generation of the friction reducing active ingredient MoS in the MoDTC friction film is improved 2 In order to enhance the friction reducing efficiency of the friction modifying additive MoDTC in the lubricating oil.
In order to achieve the above technical effects, the present application provides the following technical solutions:
an antifriction and wear resistant coating: the hard coating is deposited on the substrate or the substrate meets certain mechanical properties through surface treatment and heat treatment technology, and then the Ti-O-N coating is deposited on the surface of the substrate.
Further, the hard wear-resistant coating can be a boride coating, a nitride coating, a carbide coating, or other hard wear-resistant coatings, and the like.
Further, the substrate is a mechanical part that requires oil lubrication to reduce frictional wear.
Further, the deposition method in the present application is magnetron sputtering, and preferably, the magnetron sputtering specifically includes: using AlMgB 14 -TiB 2 Depositing an Al-Mg-Ti-B hard layer with high hardness and elastic modulus on a substrate by a target and a direct current magnetron sputtering technology, and then depositing a Ti-O-N active layer on the surface of the hard layer by a reactive magnetron sputtering technology.
Further, the method for depositing the Al-Mg-Ti-B hard layer on the substrate according to the embodiments of the present application is: using AlMgB 14 -TiB 2 Performing direct-current magnetron sputtering on the target in an argon atmosphere; the parameters used for magnetron sputtering are as follows: background vacuum is less than or equal to 3 multiplied by 10 - 4 Pa, the target power is 120W, the sputtering time is 120-180min, the sputtering pressure is 0.3-0.8Pa, and the flow of introduced argon is 35-55sccm.
Further, the method for depositing the Ti-O-N active layer on the Al-Mg-Ti-B hard layer described in the examples of the present application is: carrying out direct-current reactive magnetron sputtering on a high-purity titanium target in a mixed atmosphere of argon, oxygen and nitrogen; the parameters used for magnetron sputtering were: background vacuum is less than or equal to 3 multiplied by 10 -4 Pa, the target power is 120W, the sputtering time is 10-15min, the sputtering pressure is 0.3-0.8Pa, the introduced argon flow is 40-50sccm, the oxygen flow is 0.3-0.8sccm, and the nitrogen flow is 1-3sccm.
Further, alMgB described in the examples of this application 14 -TiB 2 The thickness of the target and the high-purity titanium target is 3-6mm, and the diameter is 40-55mm.
The antifriction and wear-resistant coating is applied to a mechanical moving part which is coated with lubricating oil containing MoDTC.
The workpiece comprises a substrate, the antifriction and wear-resistant coating deposited on the substrate and lubricating oil coated on the antifriction and wear-resistant coating, wherein the lubricating oil contains MoDTC.
Compared with the prior art, the invention achieves the following beneficial results:
(1) The invention provides a wear-resistant coating with strong synergistic effect with a friction modifier MoDTC, which can improve the tribological performance of a friction pair coated with the wear-resistant coating under oil lubrication. The antifriction and wear-resistant coating comprises hard wear-resistant coatingA coating and a Ti-O-N coating, or a friction pair surface hardened by surface technology and heat treatment and a Ti-O-N coating. The hard layer has good mechanical property, ensures the combination with the substrate and the Ti-O-N active layer, plays a role in bearing load, provides a stable attachment surface for the friction film, and is beneficial to improving the decomposition degree of MoDTC on the surface and the thickness of the friction film. The Ti-O-N coating on the surface layer has good friction catalysis effect with MoDTC, and can inhibit MoO in the friction film 3 /FeMoO 4 To increase the friction reducing component MoS 2 The ratio of (a) to (b).
(2) The common single-layer hard coating cannot ensure good compatibility with MoDTC, and the overall tribological performance of the friction pair may be reduced; in the application, a stronger tribochemical action exists between Ti-O-N and MoDTC, the action does not need the high thickness of Ti-O-N, a Ti-O-N coating with the thickness of 200nm can play a corresponding role, and the influence of the thickness on the overall mechanical property of the coating is small (the thickness of the hard wear-resistant coating generally exceeds 1000 nm).
(3) The antifriction wear-resistant coating can obviously improve MoS in the MoDTC friction film on the premise of ensuring the combination and the bearing capacity of the coating and the substrate 2 And the friction reduction efficiency of MoDTC.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the application and, together with the description, serve to explain the application and are not intended to limit the application.
Fig. 1 is a process flow diagram of a wear-resistant coating prepared in example 3 of the present invention.
FIG. 2 is a plot of the coefficient of friction curve of the single-layer wear-resistant coating prepared in example 1 of the present invention lubricated with a base oil PAO containing MoDTC and a characterization of the composition of the tribofilm in the wear scar.
FIG. 3 is a graph of the friction coefficient curve of the wear-resistant coating prepared in example 2 of the present invention lubricated by a PAO base oil containing MoDTC and a characterization of the components of a friction film in a wear scar.
FIG. 4 is a graph of the friction coefficient curve of the wear-resistant coating prepared in example 3 of the invention under lubrication of PAO base oil containing MoDTC and the composition characterization of a friction film in a grinding mark.
Detailed Description
It is to be understood that the following detailed description is exemplary and is intended to provide further explanation of the invention as claimed. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments in accordance with the invention. As used herein, the singular forms "a", "an", and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.
As described above, the relatively complex decomposition mechanism of MoDTC makes it susceptible to the chemical state of the surface of the wear-resistant coating, resulting in significant differences in the components and tribological properties of the formed friction-reducing tribofilm, which limits the widespread use of MoDTC. Meanwhile, based on the decomposition mechanism of MoDTC, the surface chemical state of the wear-resistant coating deposition process can be changed, the components of the MoDTC friction film are optimized, the synergistic effect between the wear-resistant coating and the MoDTC is enhanced, and the friction reduction efficiency of the friction film is improved. The invention provides a preparation method of a wear-resistant coating with strong synergistic effect with a friction modifier MoDTC, and the method is further explained.
As a further technical scheme, the substrate is a mechanical part and a friction pair which need good mechanical properties, particularly surface mechanical properties, and need oil lubrication to reduce friction, and the substrate material can be steel, aluminum alloy or even ceramic material such as GCr15, AISI 52100, 42CrMo and the like.
As a further solution, said substrate may be suitably pretreated to ensure good bonding of the coating.
As a further technical scheme, the method for depositing the multilayer wear-resistant coating on the substrate is magnetron sputtering, and specifically comprises the following steps: using AlMgB 14 -TiB 2 Target and DC magnetThe controlled sputtering technology deposits an Al-Mg-Ti-B hard layer with high hardness and elastic modulus on a substrate, and then a Ti-O-N active layer is deposited on the surface of the hard layer through a reactive magnetron sputtering technology.
Compared with other deposition methods, the magnetron sputtering method has the advantages of good coating compactness and uniformity, high deposition rate and accurate control of the thickness of the deposited coating.
As a further technical scheme, the method for depositing the Al-Mg-Ti-B hard layer on the substrate comprises the following steps: using AlMgB 14 -TiB 2 The target is subjected to direct-current magnetron sputtering in an argon atmosphere. The parameters used for magnetron sputtering are as follows: background vacuum is less than or equal to 3 multiplied by 10 - 4 Pa, the target power is 120W, the sputtering time is 120-180min, the sputtering pressure is 0.3-0.8Pa, and the introduced argon flow is 35-55sccm.
As a further technical scheme, the method for depositing the Ti-O-N active layer on the Al-Mg-Ti-B hard layer comprises the following steps: and (3) carrying out direct-current reactive magnetron sputtering by using a high-purity titanium target under the mixed atmosphere of argon, oxygen and nitrogen. The parameters used for magnetron sputtering were: background vacuum is less than or equal to 3 multiplied by 10 -4 Pa, the target power is 120W, the sputtering time is 10-15min, the sputtering pressure is 0.3-0.8Pa, the introduced argon flow is 40-50sccm, the oxygen flow is 0.3-0.8sccm, and the nitrogen flow is 1-3sccm.
As a further technical scheme, the AlMgB 14 -TiB 2 The thickness of the target and the high-purity titanium target is 3-6mm, and the diameter is 40-55mm.
The antifriction and wear-resistant coating is applied to a mechanical moving part which is coated with lubricating oil containing MoDTC.
The workpiece comprises a substrate, the antifriction and wear-resistant coating deposited on the substrate and lubricating oil coated on the antifriction and wear-resistant coating, wherein the lubricating oil contains MoDTC.
As a further technical scheme, the substrate is a mechanical part and a friction pair which need good mechanical properties, particularly surface mechanical properties, and need oil lubrication to reduce friction, and the substrate material can be steel, aluminum alloy or even ceramic material such as GCr15, AISI 52100, 42CrMo and the like.
As a further technical scheme, the lubricating oil can be lubricating oil containing MoDTC and base oil only or full-component oil containing MoDTC.
As a further technical scheme, the thickness of the antifriction wear-resistant coating is regulated and controlled according to the combination of the hard layer and the substrate and the like for the hard layer, the thickness of the hard layer is about 2 mu m, and the thickness of the hard layer obtained by other surface treatment or heat treatment can reach millimeter level; good tribochemical catalysis can be ensured for the Ti-O-N active layer with the thickness of about 200nm, and the thickness does not generate adverse effect on the overall mechanical property of the coating.
The invention is further illustrated with reference to fig. 1-4.
Example 1
A preparation method of a multi-layer wear-resistant coating with strong synergistic effect with a friction modifier comprises the following steps:
(1) Polishing a GCr15 bearing steel sheet, ultrasonically cleaning the steel sheet by absolute ethyl alcohol for 10min, and drying the ultrasonically cleaned steel sheet by using nitrogen;
(2) Placing the steel sheet after ultrasonic cleaning and blow-drying into a coating chamber of a magnetron sputtering device, and then vacuumizing until the vacuum in the chamber is less than or equal to 3 multiplied by 10 -4 Pa, then the steel sheet substrate is heated to 400 ℃ and this temperature is maintained during the deposition of the coating;
(3) Argon gas with the flow rate of 45sccm is introduced into the chamber to be used as a protective atmosphere and a sputtering atmosphere, and AlMgB is used 14 -TiB 2 And carrying out direct current magnetron sputtering on the target. The sputtering parameters are as follows: the target power is 120W, the sputtering time is 120min, and the air pressure in the chamber during the sputtering period is 0.5Pa. Stopping heating the substrate after sputtering is finished, ventilating the cavity after the temperature is reduced, opening the cavity and taking out the prepared product to obtain the product.
Example 2
A preparation method of a multi-layer wear-resistant coating with strong synergistic effect with a friction modifier comprises the following steps:
(1) Polishing a GCr15 bearing steel sheet, ultrasonically cleaning the steel sheet for 10min by absolute ethyl alcohol, and drying the ultrasonically cleaned steel sheet by using nitrogen;
(2) Ultrasonic cleaning andthe steel sheet after being dried is put into a coating cavity of a magnetron sputtering device, and then is vacuumized until the vacuum in the cavity is less than or equal to 3 multiplied by 10 -4 Pa, then the steel sheet substrate is heated to 400 ℃ and this temperature is maintained during the deposition of the coating;
(3) 45sccm argon gas is introduced into the chamber as a protective and sputtering atmosphere, 0.5sccm oxygen gas and 1sccm nitrogen gas are continuously introduced, and a high-purity titanium target is used for performing direct-current reactive magnetron sputtering in a mixed atmosphere. The sputtering parameters are as follows: the target power is 120W, the sputtering time is 60min, and the air pressure in the chamber is kept at 0.5Pa during the sputtering period. And stopping heating the substrate after sputtering is finished, ventilating the cavity and opening the cavity after the temperature of the substrate is reduced, and taking out the prepared sample to obtain the sample.
Example 3
A preparation method of a multi-layer wear-resistant coating with strong synergistic effect with a friction modifier comprises the following steps:
(1) Polishing a GCr15 bearing steel sheet, ultrasonically cleaning the steel sheet by absolute ethyl alcohol for 10min, and drying the ultrasonically cleaned steel sheet by using nitrogen;
(2) Placing the steel sheet after ultrasonic cleaning and drying into a coating cavity of a magnetron sputtering device, and vacuumizing until the vacuum in the cavity is less than or equal to 3 multiplied by 10 -4 Pa, then the steel sheet substrate is heated to 400 ℃ and this temperature is maintained during the deposition of the coating;
(3) Argon gas with the flow rate of 45sccm is introduced into the chamber to be used as a protective atmosphere and a sputtering atmosphere, and AlMgB is used 14 -TiB 2 And carrying out direct current magnetron sputtering on the target. The sputtering parameters are as follows: the target power is 120W, the sputtering time is 120min, and the air pressure in the chamber during sputtering is 0.5Pa. After the Al-Mg-Ti-B hard layer is sputtered, keeping the temperature of the steel sheet substrate at 400 ℃;
(4) And (4) after the hard layer is sputtered, depositing a Ti-O-N active layer on the hard layer obtained in the process (3) by using a high-purity titanium target through a direct-current reactive magnetron sputtering technology. The sputtering parameters are as follows: the flow rates of the introduced argon, nitrogen and oxygen are respectively 45sccm, 1sccm and 0.5sccm, the target power is 120W, the sputtering time is 12min, the pressure in the chamber during sputtering is 0.5Pa, and the substrate temperature is maintained at 400 ℃. And stopping heating the substrate after sputtering is finished, ventilating the chamber and opening the chamber after the temperature of the substrate is reduced, and taking out the prepared sample to obtain the target product.
Performance testing
The abradable coatings prepared in examples 1-3 were investigated for their tribological properties under lubrication with a lubricating oil containing MoDTC by a UMT-3 friction wear tester. The lubricating oil used for the experiments was a PAO base oil containing 1wt% MoDTC, and the test format used was a ball-and-disk one-way rotational friction wear test, which was performed at room temperature. Fig. 2a and fig. 3a are friction coefficient curves of the single-layer wear-resistant coatings prepared in examples 1 and 2 under oil lubrication, respectively, and it can be seen that the stable friction coefficient of the two coatings is-0.06, which is lower than the friction coefficient of the pure base oil PAO lubrication by-0.12, which indicates that the two coatings and the MoDTC have a certain synergistic effect, so that the friction coefficient of a friction pair is reduced. As shown in FIG. 2b, the surface MoDTC decomposition of the single-layer wear-resistant coating prepared in example 1 was relatively complete, but the MoDTC friction reducing film had MoO therein 3 Or FeMoO 4 The content of (A) is obviously higher than that of MoS 2 Such a composition limits the friction reducing effect of the friction film to some extent. In contrast, the single-layer wear-resistant coating in example 2 has incomplete decomposition of MoDTC on the surface, so that the friction reducing component MoS in the friction film 2 The total amount and the proportion are both low, which is not beneficial to improving the tribological performance under the lubrication of oil. Fig. 4a and fig. 4b are the friction coefficient curve and the friction film component of the wear-resistant coating prepared in example 3 under oil lubrication, respectively, and it can be seen that the synergistic effect of the coating and MoDTC is further enhanced, so that the stable friction coefficient of the friction pair is reduced to-0.04, which is close to the stable friction coefficient of 0.04 of the MoDTC lubricated iron-based friction pair under high temperature condition (80-120 ℃). Meanwhile, moDTC friction film on the surface of the multi-layer wear-resistant coating prepared in example 3 contains MoS 2 The compound with the highest content of Mo is beneficial to obtaining a lower stable friction coefficient. The tribological performance of the wear-resistant coatings with different structures under the lubrication of MoDTC shows that the synergistic effect between the coatings and the MoDTC can be obviously enhanced by firstly obtaining a hard layer on a substrate and depositing a Ti-O-N layer on the surface layer. The hard layer of the bottom layer can provide good mechanical property and bearing capacity, and is beneficial to improving the decomposition degree of MoDTC and the adhesion of the friction film on the surface;the Ti-O-N active layer with low thickness on the surface layer does not have adverse effect on the overall mechanical property of the coating, and MoO can be inhibited through a tribochemical reaction 3 /FeMoO 4 Increase MoS in the tribofilm 2 The content and the ratio of the MoDTC friction reducing film are optimized, so that the MoDTC can play a good friction reducing role at room temperature, the application range of the MoDTC is expanded, the friction reducing efficiency is improved, and the energy utilization efficiency of mechanical equipment is improved.
The above description is only a preferred embodiment of the present application and is not intended to limit the present application, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims (10)

1. An antifriction wear-resistant coating is characterized in that a hard layer is formed by depositing a hard wear-resistant coating on a substrate, performing heat treatment or performing other surface treatment, and then depositing a Ti-O-N coating on the surface of the hard layer to obtain the antifriction wear-resistant coating;
and coating lubricating oil on the antifriction and wear-resistant coating, wherein the lubricating oil contains molybdenum dialkyl dithiocarbamate (MoDTC).
2. An antifriction wear resistant coating in accordance with claim 1 wherein the hard wear resistant coating is a boride coating, a nitride coating, a carbide coating.
3. The antifriction wear coating of claim 1 wherein the substrate is a mechanical component requiring oil lubrication to reduce frictional wear.
4. Antifriction wear resistant coating according to claim 1, characterized in that the substrate is pretreated to ensure bonding of the coating.
5. Antifriction and wear-resistant coating according to claim 1, characterized in that a magnetron sputtering method is usedThe deposition is carried out by a method, preferably, the magnetron sputtering specifically comprises the following steps: using AlMgB 14 -TiB 2 Depositing an Al-Mg-Ti-B hard layer with high hardness and elastic modulus on a substrate by a target and a direct current magnetron sputtering technology, and then depositing a Ti-O-N active layer on the surface of the Al-Mg-Ti-B hard layer by a reactive magnetron sputtering technology.
6. The antifriction wear resistant coating of claim 5 wherein the hard layer of Al-Mg-Ti-B is deposited on the substrate by: using AlMgB 14 -TiB 2 Carrying out direct-current magnetron sputtering on the target in an argon atmosphere; the parameters used for magnetron sputtering are as follows: background vacuum is less than or equal to 3 multiplied by 10 -4 Pa, the target power is 120W, the sputtering time is 120-180min, the sputtering pressure is 0.3-0.8Pa, and the flow of introduced argon is 35-55sccm.
7. The antifriction wear resistant coating of claim 6 wherein the Ti-O-N active layer deposited on the Al-Mg-Ti-B hard layer is deposited by: carrying out direct-current reactive magnetron sputtering on a high-purity titanium target in a mixed atmosphere of argon, oxygen and nitrogen; the parameters used for magnetron sputtering were: background vacuum is less than or equal to 3 multiplied by 10 -4 Pa, the target power is 120W, the sputtering time is 10-15min, the sputtering pressure is 0.3-0.8Pa, the introduced argon flow is 40-50sccm, the oxygen flow is 0.3-0.8sccm, and the nitrogen flow is 1-3sccm.
8. The antifriction wear-resistant coating of claim 7 wherein the thickness of the AlMgB14-TiB2 target and the high purity titanium target are both 3-6mm and the diameter is 40-55mm.
9. A workpiece comprising a substrate, a friction reducing, wear resistant coating according to any one of claims 1 to 8 deposited on the substrate, and a lubricating oil applied to the friction reducing, wear resistant coating, the lubricating oil comprising molybdenum dialkyldithiocarbamate (MoDTC).
10. The workpiece according to claim 9, wherein the lubricating oil is a lubricating oil containing only MoDTC and base oil or a full-component lubricating oil containing MoDTC.
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