CN110079800B - Electric spark deposition preparation method of self-lubricating coating containing molybdenum dioxide - Google Patents
Electric spark deposition preparation method of self-lubricating coating containing molybdenum dioxide Download PDFInfo
- Publication number
- CN110079800B CN110079800B CN201910347989.6A CN201910347989A CN110079800B CN 110079800 B CN110079800 B CN 110079800B CN 201910347989 A CN201910347989 A CN 201910347989A CN 110079800 B CN110079800 B CN 110079800B
- Authority
- CN
- China
- Prior art keywords
- self
- lubricating coating
- electrode
- electric spark
- spark deposition
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Classifications
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C19/00—Alloys based on nickel or cobalt
- C22C19/03—Alloys based on nickel or cobalt based on nickel
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C32/00—Non-ferrous alloys containing at least 5% by weight but less than 50% by weight of oxides, carbides, borides, nitrides, silicides or other metal compounds, e.g. oxynitrides, sulfides, whether added as such or formed in situ
- C22C32/001—Non-ferrous alloys containing at least 5% by weight but less than 50% by weight of oxides, carbides, borides, nitrides, silicides or other metal compounds, e.g. oxynitrides, sulfides, whether added as such or formed in situ with only oxides
- C22C32/0015—Non-ferrous alloys containing at least 5% by weight but less than 50% by weight of oxides, carbides, borides, nitrides, silicides or other metal compounds, e.g. oxynitrides, sulfides, whether added as such or formed in situ with only oxides with only single oxides as main non-metallic constituents
- C22C32/0026—Matrix based on Ni, Co, Cr or alloys thereof
-
- 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
- C23C26/00—Coating not provided for in groups C23C2/00 - C23C24/00
- C23C26/02—Coating not provided for in groups C23C2/00 - C23C24/00 applying molten material to the substrate
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Lubricants (AREA)
- Other Surface Treatments For Metallic Materials (AREA)
Abstract
The invention relates to the field of preparation of wear-resistant coatings on surfaces of steel members, in particular to an electric spark deposition preparation method of a self-lubricating coating containing molybdenum dioxide. The matrix material is steel, the electrode for electric spark deposition is a composite material electrode formed by sintering nickel powder and molybdenum disulfide powder, and the self-lubricating coating containing molybdenum dioxide is deposited on the surface of the steel matrix by adopting an electric spark deposition technology. The nickel powder and the molybdenum disulfide powder are pressed and sintered together to form the composite material electrode, and the mass ratio of the nickel powder to the molybdenum disulfide powder in the composite material electrode is (50-80) to (20-50). The self-lubricating coating and a steel substrate are metallurgically bonded with strong bonding force, and the hardness of the self-lubricating coating is enhanced by molybdenum dioxide, so that the self-lubricating coating has better antifriction and wear-resistant effects, and the problem of abrasion of the surface of a steel member in a friction and wear environment can be solved.
Description
Technical Field
The invention relates to the field of preparation of wear-resistant coatings on surfaces of steel members, in particular to an electric spark deposition preparation method for a sintered electrode containing a solid lubricant to be used for a self-lubricating coating containing a molybdenum dioxide strengthening phase, which can be applied to coating the surfaces of steel parts and has remarkable friction-reducing and wear-resistant effects on the surfaces of the parts.
Background
Surface wear can lead to premature failure of the equipment components, which in turn can affect the proper operation of the entire equipment. In highly industrialized countries, frictional wear results in a large amount of economic loss, which accounts for about 1-2% of GDP. Therefore, the improvement of the frictional wear performance of the material surface of the key component is significant.
The solid lubricant can provide lubrication under dry friction conditions, and can be applied to mechanical components to improve the service life of the components. Molybdenum disulphide is by far one of the two most widely used solid lubricants in the world, its lubricating action being based mainly on a lamellar structure of low shear strength. Although molybdenum disulfide has excellent tribological properties, it is easily oxidized into molybdenum trioxide in the atmospheric environment, resulting in a rapid increase in its coefficient of friction and amount of wear. However, the self-lubricating composite material sintered from molybdenum disulfide and metal can be used in humid environments such as atmosphere and has excellent tribological properties.
Coating techniques have been widely used to improve the surface properties of metal components. The electric spark deposition technology can prepare a coating with excellent metallurgical bonding performance on the surface of a metal substrate, and the coating is formed by instantly discharging electrodes (anodes) and the substrate (cathodes) in a contact manner, forming strengthening points for generating physical and chemical reactions in a micro molten pool, and then connecting and overlapping the strengthening points through the back-and-forth movement of the electrodes on the surface of the substrate. Compared with the traditional coating preparation process, the electric spark surface deposition technology has the following advantages: (1) the equipment is simple and the cost is low; (2) the deposition layer and the matrix are metallurgically bonded, so that the peeling phenomenon cannot occur; (3) the influence on the central temperature of the workpiece is small, the structure and the performance change are avoided, and the workpiece is not annealed and deformed; (4) the energy consumption is low, the material consumption is low, and the electrode material can be widely selected according to the application; (5) the method can be used for repairing a wear part, has no size limitation on the workpiece, and is particularly suitable for local treatment of the oversize workpiece; (6) the operation is simple, convenient and safe, and the technical requirements on operators are not high; (7) the environment is not polluted, and the noise is low; (8) the thickness and the surface roughness of the strengthening layer can obtain different process effects by adjusting electrical parameters, controlling strengthening time and the like; (9) the cost of strengthening and repairing the parts is far lower than the cost of replacing the parts.
Recent research shows that the frictional wear performance of the matrix alloy can be remarkably improved by applying a TiN coating, an AlCoCrFiNi high-entropy alloy coating, a Zr-based amorphous-nanocrystalline coating, a Mo-Si-B coating and a Cr-Al-Si-B coating which are prepared by an electric spark deposition technology.
Disclosure of Invention
The invention aims to provide an electric spark deposition preparation method of a self-lubricating coating containing molybdenum dioxide, and the obtained self-lubricating coating can solve the problem of frictional wear of the surface of a steel matrix material in a frictional wear environment, ensure the safe and effective operation of a steel member and reduce the production and maintenance cost.
The technical scheme of the invention is as follows:
the electric spark deposition process of preparing self-lubricating coating containing molybdenum dioxide includes the steps of depositing self-lubricating coating containing molybdenum dioxide on the surface of steel base with electric spark deposition technology.
The electric spark deposition preparation method of the self-lubricating coating containing molybdenum dioxide comprises the following steps of pressing and sintering nickel powder and molybdenum disulfide powder together to form a composite material electrode, wherein the mass ratio of the nickel powder to the molybdenum disulfide powder in the composite material electrode is (50-80) - (20-50), the pressing pressure is 35-55 MPa, and the sintering temperature of the pressed electrode is as follows: sintering at 1000-1100 deg.c for 20-40 min.
The electric spark deposition preparation method of the self-lubricating coating containing molybdenum dioxide comprises the following specific steps:
(1) firstly, grinding the base material step by step according to abrasive paper of No. 240, No. 400, No. 600 and No. 800 to remove an oxide film on the surface of the base material, then polishing the base material by using grinding paste with the particle size of 2.5 mu m, and then ultrasonically cleaning the base material for 5-15 min by using acetone to remove oil stains on the surface;
(2) firstly, processing a composite material electrode into a shape suitable for electric spark deposition clamping, grinding the electrode by sand paper of 240#, 400#, 600#, and 800# step by step to remove an oxide film on the surface of the electrode, then polishing the electrode by using grinding paste with the particle size of 2.5 mu m, and then ultrasonically cleaning the electrode for 5-15 min by using acetone to remove surface oil stains;
(3) carrying out electric spark deposition under the protection of argon, wherein the specific process parameters are as follows: the output power is 800-1500W, the output voltage is 60-100V, the electrode rotation speed is 2000-4000 rpm, and the deposition rate is 1-3 min/cm2。
The electric spark deposition preparation method of the self-lubricating coating containing molybdenum dioxide adjusts the content of the molybdenum dioxide in the self-lubricating coating by changing the chemical composition of the electrode material or changing the flow of the protective gas or changing the chemical composition and the flow of the protective gas simultaneously.
According to the electric spark deposition preparation method of the self-lubricating coating containing the molybdenum dioxide, the molybdenum dioxide accounts for (5-20)% by mass.
According to the electric spark deposition preparation method of the self-lubricating coating containing molybdenum dioxide, the flow of argon is 8-12L/min.
The design idea of the invention is as follows:
the core idea of the invention is to obtain the self-lubricating coating with excellent antifriction and wear-resistant performances by utilizing the advantages of the spark technology and the synergistic effect of the molybdenum disulfide with strong self-lubricating effect and the molybdenum dioxide dispersion strengthening phase with high hardness. The method comprises the following specific steps: according to the invention, the self-lubricating coating is prepared by the composite material consisting of the nickel and the molybdenum disulfide, so that the self-lubricating coating can be prevented from being oxidized in a humid environment, and the self-lubricating coating still has an extremely low friction coefficient and plays a role in friction reduction and wear resistance. Meanwhile, by utilizing the advantages of the spark deposition technology, namely, ultra-fine grain structures can be generated in the deposition process to enhance the mechanical property of the coating, the binding force of the matrix and the coating metallurgy combination is strong, the matrix elements can generate solid solution strengthening by diffusing in the deposition layer, the equipment price is low, the operation is simple and convenient, the industrial application is convenient, and the like. In addition, the invention has the obvious advantages that the flow of argon is controlled in the electric spark deposition process, partial oxygen in the air is allowed to participate in the reaction in the electric spark deposition process, and the self-lubricating coating generates a certain amount of molybdenum dioxide oxide dispersion strengthening phase in situ, and the reaction formula is as follows:
MoS2+O2＝MoO2+2S
the molybdenum dioxide has excellent characteristics of high melting point (about 2600 ℃), high hardness (about HV1100), high red hardness, good high-temperature stability and the like, and can obviously improve the hardness of the self-lubricating coating and make up for the disadvantage of low hardness of the molybdenum disulfide, so that the wear resistance of the self-lubricating coating is further improved.
The invention has the following advantages and beneficial effects:
1. the self-lubricating coating developed by the invention is metallurgically bonded with a steel substrate with strong bonding force;
2. the self-lubricating coating developed by the invention contains in-situ formed strengthening phase molybdenum dioxide, can offset the deficiency of the mechanical property of molybdenum disulfide, and has high hardness, wherein the hardness is (5-8) GPa;
3. the self-lubricating coating developed by the invention has good antifriction and wear-resistant effects;
4. the self-lubricating coating developed by the invention has simple and convenient preparation process and is easy to realize industrial application.
Drawings
FIG. 1 shows that the surface of CrNi3MoVA steel is spark-deposited with Ni-MoS2The surface appearance of the self-lubricating coating.
FIG. 2 shows that the surface of CrNi3MoVA steel is spark-deposited with Ni-MoS2Surface a region spectrum of the self-lubricating coating. In the figure, the abscissa represents energy (keV) and the ordinate cps/eV is an abbreviation for counts per second/e volts, representing signal intensity.
FIG. 3 shows that the surface of CrNi3MoVA steel is spark-deposited with Ni-MoS2The cross section appearance of self-lubricating coating.
FIG. 4 shows that the surface of CrNi3MoVA steel is spark-deposited with Ni-MoS2Line scanning of the self-lubricating coating. Wherein (a) is Ni element, and (b) is Fe element. In the figure, the abscissa Distance represents the Distance (. mu.m) from the coating surface to the substrate, and the ordinate cps is an abbreviation for counts per second and represents the signal intensity.
FIG. 5 shows that the surface of CrNi3MoVA steel is spark-deposited with Ni-MoS2XRD spectrum of self-lubricating coating. In the figure, the abscissa 2 θ represents the diffraction angle (degree); the ordinate intensity represents the relative intensity (a.u.).
FIG. 6 shows the deposition of Ni-MoS by spark deposition2And comparing the friction coefficients of the CrNi3MoVA steel with the CrNi3MoVA steel of the self-lubricating coating. In the figure, the abscissa Time represents Time (sec); the ordinate frictioncoefficient represents the coefficient of Friction.
FIG. 7 shows the deposition of Ni-MoS by spark deposition2And (3) comparing the abrasion weight loss of the CrNi3MoVA steel with the self-lubricating coating. In the figure, the abscissa represents the wear objects of CrNi3MoVA steel and self-lubricating coating respectively, and the ordinate Weight loss represents the wear Weight loss (mg).
Detailed Description
In the specific implementation process, the nickel powder and the molybdenum disulfide powder are pressed and sintered together to form the electrode, and the mass ratio of the nickel powder to the molybdenum disulfide powder in the electrode is (50-80) to (20-50). And preparing a self-lubricating coating containing the in-situ formed molybdenum dioxide strengthening phase on the surface of the steel matrix by adopting an electric spark deposition technology and controlling the flow of protective gas.
The invention is explained in more detail below with reference to the drawings and examples:
example 1
The matrix material adopts CrNi3MoVA steel, the nickel powder and the molybdenum disulfide powder are pressed and sintered together to form the composite material electrode, the mass ratio of the nickel powder to the molybdenum disulfide powder in the electrode is 50:50, the pressing pressure is 40 MPa, the sintering temperature of the pressed electrode is 1050 ℃, and the sintering time is 20 min.
In this embodiment, the self-lubricating coating is prepared by the following steps:
(1) firstly, grinding the base material by sand paper of No. 240, No. 400, No. 600 and No. 800 step by step to remove the surface oxidation film of the base material, then polishing by using grinding paste with the granularity of 2.5 mu m, and then carrying out ultrasonic cleaning for 10min by using acetone to remove oil stains on the surface;
(2) processing a composite material electrode sintered by nickel and molybdenum disulfide into a column shape of phi 4mm multiplied by 50mm, gradually grinding according to abrasive paper of No. 240, No. 400, No. 600 and No. 800 to remove an oxide film on the surface of a substrate, then polishing by using grinding paste with the granularity of 2.5 mu m, and then ultrasonically cleaning by using acetone for 10min to remove oil stains on the surface;
(3) carrying out electric spark deposition under the protection of argon, wherein the specific process parameters are as follows: the output power is 1200W, the output voltage is 80V, the electrode rotating speed is 3500 r/min, the deposition rate is 2.5min/cm2The flow rate of argon gas was 10L/min.
Wherein, the mass percentage of the molybdenum dioxide in the self-lubricating coating is about 13 percent, and the obtained hardness of the self-lubricating coating is about 5.15 GPa.
As shown in figure 1, the CrNi3MoVA steel surface is subjected to electric spark deposition to form Ni-MoS2The surface appearance of the self-lubricating coating. As can be seen from FIG. 1, the surface of the self-lubricating coating is relatively smooth, and shows the characteristic of metal splash flowing in the process of electric spark deposition.
As shown in figure 2, the CrNi3MoVA steel surface is subjected to electric spark deposition to form Ni-MoS2Self-lubricating coatingThe surface a region of the layer (fig. 1) energy spectrum. As can be seen from fig. 2, the coating contains a small amount of elemental oxygen, indicating that the coating is oxidized during the spark deposition process.
As shown in figure 3, the CrNi3MoVA steel surface is subjected to electric spark deposition to form Ni-MoS2The cross section appearance of self-lubricating coating. As can be seen from FIG. 3, the coating has a dense structure and good bonding with the substrate, and the thickness is more than 50 μm.
As shown in figure 4, the CrNi3MoVA steel surface is spark-deposited with Ni-MoS2Line scanning of the self-lubricating coating. As can be seen from FIG. 4, the Fe element and the Ni element are in gradient transition at the bonding interface of the coating and the substrate, which indicates that the coating is in metallurgical bonding. The Distance in fig. 4 corresponds to the vertical white line in fig. 3, the dot at the top of the white line being the surface of the coating, and the white line passing through the lower end of the coating and being located in the matrix.
As shown in figure 5, the CrNi3MoVA steel surface is subjected to electric spark deposition to form Ni-MoS2XRD spectrum of self-lubricating coating. As can be seen from fig. 5, the coating contains a molybdenum dioxide strengthening phase.
As shown in FIG. 6, the spark deposition of Ni-MoS was applied2And comparing the friction coefficients of the CrNi3MoVA steel with the CrNi3MoVA steel of the self-lubricating coating. An MFT-5000 friction wear testing machine is adopted, wherein the friction wear condition is that the reciprocating distance is 6mm, the reciprocating speed is 5mm/sec, the load is 20N, the friction time is 30min, and the opposite grinding piece is a GCr15 steel ball with the diameter of phi 9.5 mm. As can be seen from FIG. 6, the CrNi3MoVA steel has a stable friction coefficient of 0.73-0.75, and the electric spark is applied to deposit Ni-MoS2The stable friction coefficient of the CrNi3MoVA steel of the self-lubricating coating is only 0.18-0.19.
As shown in FIG. 7, the spark deposition of Ni-MoS was applied2And (3) comparing the abrasion weight loss of the CrNi3MoVA steel with the self-lubricating coating. As can be seen from FIG. 7, the abrasion weight loss of CrNi3MoVA steel is 12.17mg, while the spark deposition of Ni-MoS is applied2The abrasion weight loss of the CrNi3MoVA steel with the self-lubricating coating is only 3.05 mg.
Example 2
The matrix material adopts No. 45 steel, the nickel powder and the molybdenum disulfide powder are pressed and sintered together to form the composite material electrode, the mass ratio of the nickel powder to the molybdenum disulfide powder in the electrode is 60:40, the pressing pressure is 45MPa, the sintering temperature of the pressed electrode is 1000 ℃, and the sintering time is 25 min.
In this embodiment, the self-lubricating coating is prepared by the following steps:
(1) firstly, grinding the base material by sand paper of No. 240, No. 400, No. 600 and No. 800 step by step to remove the surface oxidation film of the base material, then polishing by using grinding paste with the granularity of 2.5 mu m, and then carrying out ultrasonic cleaning for 8min by using acetone to remove oil stains on the surface;
(2) processing a composite material electrode sintered by nickel and molybdenum disulfide into a columnar shape of phi 3mm multiplied by 50mm, gradually grinding according to abrasive paper of No. 240, No. 400, No. 600 and No. 800 to remove an oxide film on the surface of a substrate, then polishing by using grinding paste with the granularity of 2.5 mu m, and then ultrasonically cleaning by using acetone for 8min to remove oil stains on the surface;
(3) carrying out electric spark deposition under the protection of argon, wherein the specific process parameters are as follows: the output power is 1000W, the output voltage is 70V, the electrode rotating speed is 3000 r/min, the deposition rate is 1.5min/cm2The flow rate of argon was 9L/min.
Wherein, the mass percentage of the molybdenum dioxide in the self-lubricating coating is about 11 percent, and the obtained hardness of the self-lubricating coating is about 5.62 GPa. An MFT-5000 friction wear testing machine is adopted, wherein the friction wear condition is that the reciprocating distance is 6mm, the reciprocating speed is 5mm/sec, the load is 20N, the friction time is 30min, and the opposite grinding piece is a GCr15 steel ball with the diameter of phi 9.5 mm. The detection shows that the stable friction coefficient of No. 45 steel is 0.71-0.74, and the electric spark deposition is applied to deposit Ni-MoS2The stable friction coefficient of the No. 45 steel of the self-lubricating coating is only 0.15-0.16. Steel No. 45 had an abrasion loss of 16.37mg, whereas the spark deposition of Ni-MoS was applied2The abrasion loss of steel No. 45 with the self-lubricating coating is only 3.14 mg.
Example 3
The base material is Q235 steel, the nickel powder and the molybdenum disulfide powder are pressed and sintered together to form the composite material electrode, the mass ratio of the nickel powder to the molybdenum disulfide powder in the electrode is 55:45, the pressing pressure is 50MPa, the sintering temperature of the pressed electrode is 1050 ℃, and the sintering time is 30 min.
In this embodiment, the self-lubricating coating is prepared by the following steps:
(1) firstly, grinding the base material by sand paper of No. 240, No. 400, No. 600 and No. 800 step by step to remove the surface oxidation film of the base material, then polishing by using grinding paste with the granularity of 2.5 mu m, and then carrying out ultrasonic cleaning for 9min by using acetone to remove oil stains on the surface;
(2) processing a composite material electrode sintered by nickel and molybdenum disulfide into a column shape of phi 5mm multiplied by 40mm, gradually grinding according to abrasive paper of No. 240, No. 400, No. 600 and No. 800 to remove an oxide film on the surface of a substrate, then polishing by using grinding paste with the granularity of 2.5 mu m, and then ultrasonically cleaning by using acetone for 9min to remove oil stains on the surface;
(3) carrying out electric spark deposition under the protection of argon, wherein the specific process parameters are as follows: the output power is 1100W, the output voltage is 75V, the electrode rotating speed is 3000 r/min, the deposition rate is 2min/cm2The flow rate of argon was 8L/min.
Wherein, the mass percentage of the molybdenum dioxide in the self-lubricating coating is about 14 percent, and the obtained hardness of the self-lubricating coating is about 6.10 GPa. An MFT-5000 friction wear testing machine is adopted, wherein the friction wear condition is that the reciprocating distance is 6mm, the reciprocating speed is 5mm/sec, the load is 20N, the friction time is 30min, and the opposite grinding piece is a GCr15 steel ball with the diameter of phi 9.5 mm. The detection shows that the stable friction coefficient of the Q235 steel is 0.75-0.79, and the electric spark deposition of Ni-MoS is applied2The Q235 steel of the self-lubricating coating has a stable friction coefficient of only 0.19-0.20. The abrasion weight loss of the Q235 steel is 17.62mg, and the electric spark is applied to deposit Ni-MoS2The abrasion weight loss of the self-lubricating coated Q235 steel is only 3.09 mg.
Example 4
The matrix material is 40Cr steel, and the nickel powder and the molybdenum disulfide powder are pressed and sintered together to form the composite material electrode, wherein the mass ratio of the nickel powder to the molybdenum disulfide powder in the electrode is 65:35, the pressing pressure is 50MPa, the sintering temperature of the pressed electrode is 1050 ℃, and the sintering time is 30 min.
In this embodiment, the self-lubricating coating is prepared by the following steps:
(1) firstly, grinding the base material by sand paper of No. 240, No. 400, No. 600 and No. 800 step by step to remove the surface oxidation film of the base material, then polishing by using grinding paste with the granularity of 2.5 mu m, and then carrying out ultrasonic cleaning for 12min by using acetone to remove oil stains on the surface;
(2) processing a composite material electrode sintered by nickel and molybdenum disulfide into a column shape of phi 5mm multiplied by 40mm, gradually grinding according to abrasive paper of No. 240, No. 400, No. 600 and No. 800 to remove an oxide film on the surface of a substrate, then polishing by using grinding paste with the granularity of 2.5 mu m, and then ultrasonically cleaning by using acetone for 12min to remove oil stains on the surface;
(3) carrying out electric spark deposition under the protection of argon, wherein the specific process parameters are as follows: the output power is 1200W, the output voltage is 80V, the electrode rotating speed is 2500 rpm, and the deposition rate is 3min/cm2The flow rate of argon was 11L/min. Wherein, the mass percentage of the molybdenum dioxide in the self-lubricating coating is about 15 percent, and the obtained hardness of the self-lubricating coating is about 6.92 GPa. An MFT-5000 friction wear testing machine is adopted, wherein the friction wear condition is that the reciprocating distance is 6mm, the reciprocating speed is 5mm/sec, the load is 20N, the friction time is 30min, and the opposite grinding piece is a GCr15 steel ball with the diameter of phi 9.5 mm. The detection shows that the stable friction coefficient of the 40Cr steel is 0.78-0.81, and the electric spark is applied to deposit Ni-MoS2The stable friction coefficient of the 40Cr steel of the self-lubricating coating is only 0.15-0.16. The 40Cr steel had an abrasion loss of 16.43mg, whereas the spark-deposited Ni-MoS was applied2The abrasion loss of the 40Cr steel with the self-lubricating coating is only 2.95 mg.
Example 5
The matrix material is H13 steel, the nickel powder and the molybdenum disulfide powder are pressed and sintered together to form the composite material electrode, the mass ratio of the nickel powder to the molybdenum disulfide powder in the electrode is 70:30, the pressing pressure is 50MPa, the sintering temperature of the pressed electrode is 1100 ℃, and the sintering time is 30 min.
In this embodiment, the self-lubricating coating is prepared by the following steps:
(1) firstly, grinding the base material by sand paper of No. 240, No. 400, No. 600 and No. 800 step by step to remove the surface oxidation film of the base material, then polishing by using grinding paste with the granularity of 2.5 mu m, and then carrying out ultrasonic cleaning for 15min by using acetone to remove oil stains on the surface;
(2) processing a composite material electrode sintered by nickel and molybdenum disulfide into a column shape of phi 5mm multiplied by 40mm, gradually grinding according to abrasive paper of No. 240, No. 400, No. 600 and No. 800 to remove an oxide film on the surface of a substrate, then polishing by using grinding paste with the granularity of 2.5 mu m, and then ultrasonically cleaning by using acetone for 15min to remove oil stains on the surface;
(3) carrying out electric spark deposition under the protection of argon, wherein the specific process parameters are as follows: the output power is 1500W, the output voltage is 100V, the electrode rotating speed is 2000 r/min, the deposition rate is 1.5min/cm2The argon flow rate was 12L/min.
Wherein, the mass percentage of the molybdenum dioxide in the self-lubricating coating is about 11 percent, and the obtained hardness of the self-lubricating coating is about 5.52 GPa. An MFT-5000 friction wear testing machine is adopted, wherein the friction wear condition is that the reciprocating distance is 6mm, the reciprocating speed is 5mm/sec, the load is 20N, the friction time is 30min, and the opposite grinding piece is a GCr15 steel ball with the diameter of phi 9.5 mm. Through detection, the stable friction coefficient of the H13 steel is 0.68-0.72, and the electric spark deposition of Ni-MoS is applied2The stable friction coefficient of the H13 steel of the self-lubricating coating is only 0.16-0.17. The abrasion loss of H13 steel was 14.59mg, while applying spark-deposited Ni-MoS2The abrasion loss of the H13 steel with the self-lubricating coating is only 2.98 mg.
The embodiment result shows that the self-lubricating coating and the steel substrate are metallurgically bonded with strong bonding force, the hardness of the self-lubricating coating is enhanced by molybdenum dioxide, and the self-lubricating coating obtained by the process has excellent wear resistance, is easy to control and is suitable for industrial application.
The self-lubricating coating is applied to the surface of a steel member, can obviously improve the wear resistance of the steel member, and can be used in the fields of petroleum, military industry, electric power, aviation and the like. Therefore, other changes and modifications can be made according to the technical scheme and the technical idea of the invention, and the changes and modifications still fall within the protection scope covered by the invention.
Claims (3)
1. The electric spark deposition preparation method of the self-lubricating coating containing the molybdenum dioxide is characterized in that a base material adopts steel, an electrode for electric spark deposition is a composite material electrode formed by sintering nickel powder and molybdenum disulfide powder, and the self-lubricating coating containing the molybdenum dioxide is deposited on the surface of a steel base by adopting an electric spark deposition technology;
the method comprises the following steps of pressing and sintering nickel powder and molybdenum disulfide powder together to form the composite material electrode, wherein the mass ratio of the nickel powder to the molybdenum disulfide powder in the composite material electrode is (50-80) - (20-50), the pressing pressure is 35-55 MPa, and the sintering temperature of the pressed electrode is as follows: sintering at 1000-1100 ℃ for 20-40 min;
the electric spark deposition preparation method of the self-lubricating coating containing molybdenum dioxide comprises the following specific steps:
(1) firstly, grinding the base material step by step according to abrasive paper of No. 240, No. 400, No. 600 and No. 800 to remove an oxide film on the surface of the base material, then polishing the base material by using grinding paste with the particle size of 2.5 mu m, and then ultrasonically cleaning the base material for 5-15 min by using acetone to remove oil stains on the surface;
(2) firstly, processing a composite material electrode into a shape suitable for electric spark deposition clamping, grinding the electrode by sand paper of 240#, 400#, 600#, and 800# step by step to remove an oxide film on the surface of the electrode, then polishing the electrode by using grinding paste with the particle size of 2.5 mu m, and then ultrasonically cleaning the electrode for 5-15 min by using acetone to remove surface oil stains;
(3) carrying out electric spark deposition under the protection of argon, wherein the specific process parameters are as follows: the output power is 800-1500W, the output voltage is 60-100V, the electrode rotation speed is 2000-4000 rpm, and the deposition rate is 1-3 min/cm2The flow rate of argon gas is 8-12L/min.
2. The process for the electro-spark deposition preparation of a self-lubricating coating comprising molybdenum dioxide as claimed in claim 1, wherein the content of molybdenum dioxide in the self-lubricating coating is adjusted by changing the chemical composition of the electrode material or by changing the flow rate of the protective gas, or by both.
3. The method for preparing a self-lubricating coating containing molybdenum dioxide by electric spark deposition according to claim 2, wherein the mass percent of the molybdenum dioxide is (5-20%).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910347989.6A CN110079800B (en) | 2019-04-28 | 2019-04-28 | Electric spark deposition preparation method of self-lubricating coating containing molybdenum dioxide |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910347989.6A CN110079800B (en) | 2019-04-28 | 2019-04-28 | Electric spark deposition preparation method of self-lubricating coating containing molybdenum dioxide |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN110079800A CN110079800A (en) | 2019-08-02 |
| CN110079800B true CN110079800B (en) | 2020-12-04 |
Family
ID=67417225
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910347989.6A Active CN110079800B (en) | 2019-04-28 | 2019-04-28 | Electric spark deposition preparation method of self-lubricating coating containing molybdenum dioxide |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110079800B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113445047B (en) * | 2021-05-31 | 2023-04-14 | 沈阳理工大学 | Electric spark deposition preparation method of self-lubricating coating containing fine-grained tungsten and tungsten disulfide |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS51104447A (en) * | 1975-03-12 | 1976-09-16 | Suwa Seikosha Kk | JUNKATSUSEIHIMAKUOKEISEISASETABUHINOSOCHAKUSHITA TOKEI |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN85107628B (en) * | 1985-10-18 | 1987-09-16 | 冶金工业部钢铁研究总院 | Self-lubricating solid material and its processing |
| CN102400080A (en) * | 2011-11-28 | 2012-04-04 | 镇江中孚复合材料有限公司 | Method for preparing self-lubricating deep groove ball bearing |
| CN103290412B (en) * | 2013-06-25 | 2015-05-06 | 青岛科技大学 | An electro spark deposition process for preparing a self-lubricating coating |
| CN103436883B (en) * | 2013-08-07 | 2016-04-20 | 青岛科技大学 | Based on self-lubricating coat in use cutter prepared by electric spark deposition and preparation method thereof |
-
2019
- 2019-04-28 CN CN201910347989.6A patent/CN110079800B/en active Active
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS51104447A (en) * | 1975-03-12 | 1976-09-16 | Suwa Seikosha Kk | JUNKATSUSEIHIMAKUOKEISEISASETABUHINOSOCHAKUSHITA TOKEI |
Also Published As
| Publication number | Publication date |
|---|---|
| CN110079800A (en) | 2019-08-02 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| RU2296804C1 (en) | Aluminum alloy for application of coats on surfaces subjected to tribological loads | |
| WO2020093784A1 (en) | Multi-component composite sulfide solid lubricating film, preparation method therefor and use thereof | |
| Ling et al. | Microstructure and improved tribological performance of graphite/copper‑zinc composite coatings fabricated by low pressure cold spraying | |
| Cao et al. | The friction and wear behavior of Cu/Cu-MoS2 self-lubricating coating prepared by electrospark deposition | |
| CN114086176B (en) | Electric spark deposition preparation method of self-lubricating coating containing tantalum oxide | |
| EP1231299A1 (en) | Light alloy-based composite protective multifunction coating | |
| WO2008091406A2 (en) | Lubricant-hard-ductile nanocomposite coatings and methods of making | |
| CN110079800B (en) | Electric spark deposition preparation method of self-lubricating coating containing molybdenum dioxide | |
| KR20000005819A (en) | Plain bearing and method for the production thereof | |
| Lin et al. | Conductive and tribological properties of TiN-Ag composite coatings under grease lubrication | |
| Nguyen et al. | Study of the formation of the alloyed surface layer during plasma heating of mixtures of Cu-Sn/CrXCY alloys | |
| FR2474058A1 (en) | POWDER FOR THE PRODUCTION OF A THERMAL PROJECTION PROTECTIVE LAYER | |
| Bin et al. | Effects of graphite content on microstructure and tribological properties of graphite/TiC/Ni-base alloy composite coatings | |
| Penyashki et al. | Improving surface properties of titanium alloys by electrospark deposition with low pulse energy | |
| CN112281105B (en) | Metal ceramic composite coating and preparation method and application thereof | |
| CN113445047B (en) | Electric spark deposition preparation method of self-lubricating coating containing fine-grained tungsten and tungsten disulfide | |
| Güler et al. | The effect of advanced electrodeposited Ni-P-Cu coatings obtained with scrap cu plates on the tribological performance of Al powder metallurgy products | |
| CN110699627A (en) | Corrosion-resistant electric arc spraying powder core wire material and coating preparation method | |
| CN114032546B (en) | Electric spark deposition preparation method of tungsten alloy coating containing aluminum oxide | |
| CN110205628A (en) | A kind of process for electric spark deposition preparation of the self-lubricating coat in use based on non-conductive ceramic | |
| CN117966071A (en) | W-WS2Electric spark deposition preparation method of self-lubricating coating | |
| Manjunatha et al. | The effect of sealing on the wear behaviour of plasma sprayed Mo coating | |
| CN109338266A (en) | A kind of wear resistant self-lubricating coating and preparation method | |
| CN201615140U (en) | Sliding bearing | |
| JPWO2009099239A1 (en) | Discharge coating method and green compact electrode used therefor |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |