CN110079800A - A kind of process for electric spark deposition preparation of the self-lubricating coat in use comprising molybdenum dioxide - Google Patents
A kind of process for electric spark deposition preparation of the self-lubricating coat in use comprising molybdenum dioxide Download PDFInfo
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- CN110079800A CN110079800A CN201910347989.6A CN201910347989A CN110079800A CN 110079800 A CN110079800 A CN 110079800A CN 201910347989 A CN201910347989 A CN 201910347989A CN 110079800 A CN110079800 A CN 110079800A
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- 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
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- 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
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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
- 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
Abstract
The present invention relates to the preparation field of steel member surface abrasion coating, the process for electric spark deposition preparation of specially a kind of self-lubricating coat in use comprising molybdenum dioxide.Basis material uses steel, and composite electrode made of electric spark deposition electricity consumption extremely nickel powder and molybdenum disulfide powder sintering, using electric spark deposition technology, on steel matrix surface, deposition includes the self-lubricating coat in use of molybdenum dioxide.Composite electrode is sintered into using nickel powder is repressed together with molybdenum disulfide powder, and the mass ratio of nickel powder and molybdenum disulphide powder is (50~80): (20~50) in composite electrode.The self-lubricating coat in use and steel matrix are the strong metallurgical bonding of binding force, and molybdenum dioxide enhances the hardness of self-lubricating coat in use, so that self-lubricating coat in use is had better anti-friction wear-resistant effect, are able to solve the wear problem on the steel member surface under fretting wear environment.
Description
Technical field
The present invention relates to the preparation fields of steel member surface abrasion coating, contain solid lubricant more particularly to one kind
Sintered electrode be used for the self-lubricating coat in use containing molybdenum dioxide hardening constituent process for electric spark deposition preparation, can be applied to realize
Coating to steel components surface has significant anti-friction wear-resistant effect to piece surface.
Background technique
Surface abrasion can result in the premature failure of element of installation, and then influence the normal work of whole equipment.In height
In industrialized country, fretting wear leads to a large amount of economic loss, accounts for about 1~2%GDP.Therefore, key member material table is improved
The friction and wear behavior in face is significant.
Solid lubricant is capable of providing lubricating action under dry friction conditions, can be applied in mechanical component to improve structure
The service life of part.Up to the present, molybdenum disulfide is one of most widely used two kinds of solid lubricants in the world, its profit
Sliding effect is mainly based upon the layer structure of low shear strength.Although molybdenum disulfide has excellent tribological property,
It is easily oxidized to molybdenum trioxide in atmospheric environment, is improved rapidly so as to cause its coefficient of friction and abrasion loss.However, by curing
Molybdenum and metal sintering can use in the wet environments such as atmosphere at self-lubricating composite and have excellent tribology
Energy.
Coating technology has been widely used for improving the surface property of metal component.Electric spark deposition technology can be in metallic matrix
Surface preparation has the coating of metallurgical bonding haveing excellent performance, it is put by electrode (anode) and matrix (cathode) instantaneous touch
Electricity, and the strengthening point that physical-chemical reaction occurs is formed in the small molten bath is backhauled by electrode in matrix surface thereafter
It is dynamic, overlapping is connected with each other between strengthening point and forms coating.Compared with traditional preparation technology of coating, electric discharge surface deposits skill
Art has the advantage that (1) equipment is simple, low cost；(2) sedimentary and matrix are metallurgical bonding, and peeling phenomenon will not occur；
(3) workpiece center portion temperature is influenced less, inorganization and performance change, workpiece will not be annealed and be deformed；(4) it consumes energy less, material
Consume low, and electrode material can select extensively depending on the application；(5) it can be used to repair wear-out part, workpiece is limited without size
System, is especially suitable for the Local treatment of super-huge workpiece；(6) easy to operate, safety is not high to operator's technical requirements；(7) no
Environment is polluted, noise is small；(8) strengthening layer thickness and surface roughness can be obtained by adjusting electric parameter and control enhanced time etc.
Obtain different technological effects；(9) part strengthens rehabilitation cost far below renewal part cost.
Recent studies suggest that using electric spark deposition technology preparation TiN coating, AlCoCrFiNi high entropy alloy coating,
Zr based amorphous-nano-crystalline coating, Mo-Si-B coating and Cr-Al-Si-B coating, can significantly improve the friction of matrix alloy
Polishing machine.
Summary of the invention
The present invention intends to provide a kind of process for electric spark deposition preparation of self-lubricating coat in use comprising molybdenum dioxide, obtain
Self-lubricating coat in use be able to solve the fretting wear problem on the steel as matrix material surface under fretting wear environment, ensure steel member
It safely, effectively runs, reduces production and maintenance cost.
The technical scheme is that
A kind of process for electric spark deposition preparation of the self-lubricating coat in use comprising molybdenum dioxide, basis material use steel, electrical fire
Composite electrode made of the electricity consumption of flower deposition extremely nickel powder and molybdenum disulfide powder sintering, using electric spark deposition technology, in steel
Matrix surface deposition includes the self-lubricating coat in use of molybdenum dioxide.
The process for electric spark deposition preparation of the self-lubricating coat in use comprising molybdenum dioxide, using nickel powder and molybdenum disulfide
Powder is repressed together to sinter composite electrode into, and the mass ratio of nickel powder and molybdenum disulphide powder is in composite electrode
(50~80): (20~50) suppress 35~55MPa of pressure, the sintering temperature of electrode after compacting are as follows: and 1000~1100 DEG C, sintering
20~40min of time.
The process for electric spark deposition preparation of the self-lubricating coat in use comprising molybdenum dioxide, the specific steps are as follows:
(1) first basis material is polished step by step according to the sand paper of 240#, 400#, 600#, 800#, removal matrix surface oxidation
Then film is polished with the abrasive pastes that granularity is 2.5 μm, then carries out 5~15min of ultrasonic cleaning with acetone to remove surface
Greasy dirt；
(2) composite electrode is first processed into the shape of suitable electric spark deposition clamping, and according to 240#, 400#,
The sand paper of 600#, 800# are polished step by step, remove electrode surface oxidation film, are then polished with the abrasive pastes that granularity is 2.5 μm,
Then 5~15min of ultrasonic cleaning is carried out to remove surface and oil contaminant with acetone；
(3) electric spark deposition, specific process parameter are carried out under protection of argon gas are as follows: output power is 800~1500 W, defeated
Voltage is 60~100V out, and 2000~4000 turns/min of electrode revolving speed, deposition rate is 1~3min/cm2。
The process for electric spark deposition preparation of the self-lubricating coat in use comprising molybdenum dioxide, by changing electrode material
Chemical component changes shield gas flow rate, or both and changes simultaneously, to adjust containing for molybdenum dioxide in self-lubricating coat in use
Amount.
The process for electric spark deposition preparation of the self-lubricating coat in use comprising molybdenum dioxide, the quality percentage of molybdenum dioxide
Content is (5~20) %.
The process for electric spark deposition preparation of the self-lubricating coat in use comprising molybdenum dioxide, argon flow are 8~12L/
min。
Design philosophy of the invention is:
Core concept of the present invention is the advantage using spark technology, by means of the strong molybdenum disulfide of self-lubricating function and firmly
The synergistic effect for spending high molybdenum dioxide dispersion strengthening phase obtains the splendid self-lubricating coat in use of properties of antifriction and wear resistance.It is specific as follows:
Single molybdenum disulfide can only keep extremely low coefficient of friction in dry environment or vacuum, and easily be oxidized in humid air
Forming molybdenum trioxide increased dramatically coefficient of friction, and the present invention forms composite material preparation self-lubricating by nickel and molybdenum disulfide and applies
Layer, can be avoided self-lubricating coat in use and is oxidized in wet environment, to still have extremely low coefficient of friction, play anti-friction wear-resistant
Effect.Meanwhile using the advantage of electric spark deposition technology, i.e., can generate ultrafine-grained (UFG) microstructure during the deposition process makes coating power
Performance enhancement is learned, matrix and the binding force of coating metallurgical bonding are strong, and matrix element is spread in sedimentary can generate solid solution by force
To change, equipment price is low, and it is easy to operate, convenient for industrial applications etc..In addition, significant advantage of the invention is by heavy in electric spark
The flow that argon gas is controlled during product, allows electric spark to have in air partial oxidation to participate in reaction during the deposition process, makes from moistening
Sliding a certain amount of molybdenum dioxide oxide dispersion intensifying phase of coating in-situ preparation, reaction equation are as follows:
MoS2+O2=MoO2+2S
Molybdenum dioxide has high-melting-point (about 2600 DEG C), high rigidity (about HV1100), high red hardness and high-temperature stability good
Equal good characteristics, molybdenum dioxide can be such that the hardness of self-lubricating coat in use significantly improves, make up the low disadvantage of molybdenum disulfide hardness, from
And further increase the wear-resisting property of self-lubricating coat in use.
It advantages of the present invention and has the beneficial effect that:
1, the self-lubricating coat in use and steel matrix that the present invention develops are the strong metallurgical bonding of binding force；
2, the self-lubricating coat in use that the present invention develops contains the hardening constituent molybdenum dioxide being formed in situ, and can offset curing
The deficiency of molybdenum mechanical property, makes coating have high rigidity, and hardness is (5~8) GPa；
3, the self-lubricating coat in use that the present invention develops has good anti-friction wear-resistant effect；
4, the self-lubricating coat in use that the present invention develops, preparation process is easy, industrial applications easy to accomplish.
Detailed description of the invention
Fig. 1 is CrNi3MoVA steel surface electric spark deposition Ni-MoS2The surface topography of self-lubricating coat in use.
Fig. 2 is CrNi3MoVA steel surface electric spark deposition Ni-MoS2The surface A region power spectrum of self-lubricating coat in use.In figure,
Abscissa represents energy (keV), and ordinate cps/eV is the abbreviation of counts per second/e volts, and representation signal is strong
Degree.
Fig. 3 is CrNi3MoVA steel surface electric spark deposition Ni-MoS2The Cross Section Morphology of self-lubricating coat in use.
Fig. 4 is CrNi3MoVA steel surface electric spark deposition Ni-MoS2The line of self-lubricating coat in use scans.Wherein, (a) is Ni
Element (b) is Fe element.In figure, abscissa Distance represents the distance (μm) by coating surface to matrix, ordinate cps
For the abbreviation of counts per second, representation signal intensity.
Fig. 5 is CrNi3MoVA steel surface electric spark deposition Ni-MoS2The XRD of self-lubricating coat in use is composed.In figure, 2 θ of abscissa
Represent the angle of diffraction (degree)；Ordinate intensity represents relative intensity (a.u.).
Fig. 6 is to apply electric spark deposition Ni-MoS2The friction of the CrNi3MoVA steel and CrNi3MoVA steel of self-lubricating coat in use
Index contrast.In figure, abscissa Time represents time (sec)；Ordinate Friction coefficient represents coefficient of friction.
Fig. 7 is to apply electric spark deposition Ni-MoS2The abrasion of the CrNi3MoVA steel and CrNi3MoVA steel of self-lubricating coat in use
Weightlessness comparison.In figure, it is respectively CrNi3MoVA steel and self-lubricating coat in use, ordinate Weight that abscissa, which represents abrasion object,
Loss represents wear weight loss (mg).
Specific embodiment
In the specific implementation process, the present invention sinters electrode, electricity into using nickel powder is repressed together with molybdenum disulfide powder
The mass ratio of extremely middle nickel powder and molybdenum disulphide powder is (50~80): (20~50).Using electric spark deposition technology, pass through control
Shield gas flow rate, on steel matrix surface, preparation includes the self-lubricating coat in use for the molybdenum dioxide hardening constituent being formed in situ.
In the following, in conjunction with accompanying drawings and embodiments, the present invention is described in further detail:
Embodiment 1
Basis material uses CrNi3MoVA steel, sinters composite wood into using nickel powder is repressed together with molybdenum disulfide powder
Expect electrode, the mass ratio of nickel powder and molybdenum disulphide powder is 50:50 in electrode, suppresses 40 MPa of pressure, the burning of electrode after compacting
Junction temperature is 1050 DEG C, sintering time 20min.
In the present embodiment, self-lubricating coat in use preparation step is as follows:
(1) first basis material is polished step by step according to the sand paper of 240#, 400#, 600#, 800#, removal matrix surface oxidation
Then film is polished with the abrasive pastes that granularity is 2.5 μm, then carry out ultrasonic cleaning 10min with acetone to remove surface oil
It is dirty；
(2) nickel and the composite electrode of molybdenum disulfide sintering are processed into Φ 4mm × 50mm column, and according to 240#,
The sand paper of 400#, 600#, 800# are polished step by step, remove matrix surface oxidation film, are then carried out with the abrasive pastes that granularity is 2.5 μm
Polishing then carries out ultrasonic cleaning 10min with acetone to remove surface and oil contaminant；
(3) electric spark deposition, specific process parameter are carried out under protection of argon gas are as follows: output power 1200W, output voltage
For 80V, electrode revolving speed 3500 turns/min, deposition rate 2.5min/cm2, argon flow 10L/min.
Wherein, the mass percentage of molybdenum dioxide is about 13% in self-lubricating coat in use, obtains the hardness of self-lubricating coat in use
About 5.15GPa.
As shown in Figure 1, CrNi3MoVA steel surface electric spark deposition Ni-MoS2The surface topography of self-lubricating coat in use.By Fig. 1
As can be seen that self-lubricating coat in use surface is relatively smooth, metal gushes the feature for splashing flowing during showing electric spark deposition.
As shown in Fig. 2, CrNi3MoVA steel surface electric spark deposition Ni-MoS2The surface A region (Fig. 1) of self-lubricating coat in use
Power spectrum.As seen from Figure 2, a small amount of oxygen element is contained in coating, shows to be oxidized in electric spark deposition process floating coat.
As shown in figure 3, CrNi3MoVA steel surface electric spark deposition Ni-MoS2The Cross Section Morphology of self-lubricating coat in use.By Fig. 3
As can be seen that coating structure is fine and close, it is well combined with matrix, thickness is greater than 50 μm.
As shown in figure 4, CrNi3MoVA steel surface electric spark deposition Ni-MoS2The line of self-lubricating coat in use scans.It can by Fig. 4
To find out, Fe element and Ni element show that coating is metallurgical bonding in coating and the transition in gradient of matrix combination interface.In Fig. 4
Distance (distance) it is corresponding with the vertical white line in Fig. 3, the dot on white line top is coating surface, and white line passes through coating
Lower end be located in matrix.
As shown in figure 5, CrNi3MoVA steel surface electric spark deposition Ni-MoS2The XRD of self-lubricating coat in use is composed.It can be with by Fig. 5
Find out, molybdenum dioxide hardening constituent is contained in coating.
As shown in fig. 6, applying electric spark deposition Ni-MoS2The CrNi3MoVA steel of self-lubricating coat in use and CrNi3MoVA steel
Coefficient of friction comparison.Using MFT-5000 friction wear testing machine, wherein fretting wear condition is reciprocal distance 6mm, toward complex-velocity
5mm/sec, load 20N, fraction time 30min are spent, opposite grinding part is the GCr15 steel ball of Φ 9.5mm.As seen from Figure 6,
The stable coefficient of friction of CrNi3MoVA steel is 0.73~0.75, and applies electric spark deposition Ni-MoS2Self-lubricating coat in use
The stable coefficient of friction of CrNi3MoVA steel is only 0.18~0.19.
As shown in fig. 7, applying electric spark deposition Ni-MoS2The CrNi3MoVA steel of self-lubricating coat in use and CrNi3MoVA steel
Wear weight loss comparison.As seen from Figure 7, the wear weight loss of CrNi3MoVA steel is 12.17mg, and applies electric spark deposition Ni-
MoS2The wear weight loss of the CrNi3MoVA steel of self-lubricating coat in use is only 3.05mg.
Embodiment 2
Basis material uses No. 45 steel, sinters composite material electricity into using nickel powder is repressed together with molybdenum disulfide powder
Pole, the mass ratio of nickel powder and molybdenum disulphide powder is 60:40 in electrode, suppresses pressure 45MPa, the sintering temperature of electrode after compacting
It is 1000 DEG C, sintering time 25min.
In the present embodiment, self-lubricating coat in use preparation step is as follows:
(1) first basis material is polished step by step according to the sand paper of 240#, 400#, 600#, 800#, removal matrix surface oxidation
Then film is polished with the abrasive pastes that granularity is 2.5 μm, then carry out ultrasonic cleaning 8min with acetone to remove surface oil
It is dirty；
(2) nickel and the composite electrode of molybdenum disulfide sintering are processed into Φ 3mm × 50mm column, and according to 240#,
The sand paper of 400#, 600#, 800# are polished step by step, remove matrix surface oxidation film, are then carried out with the abrasive pastes that granularity is 2.5 μm
Polishing then carries out ultrasonic cleaning 8min with acetone to remove surface and oil contaminant；
(3) electric spark deposition, specific process parameter are carried out under protection of argon gas are as follows: output power 1000W, output voltage
For 70V, electrode revolving speed 3000 turns/min, deposition rate 1.5min/cm2, argon flow 9L/min.
Wherein, the mass percentage of molybdenum dioxide is about 11% in self-lubricating coat in use, obtains the hardness of self-lubricating coat in use
About 5.62GPa.Using MFT-5000 friction wear testing machine, wherein fretting wear condition is reciprocal distance 6mm, reciprocating speed
5mm/sec, load 20N, fraction time 30min, opposite grinding part are the GCr15 steel ball of Φ 9.5mm.Through detecting, No. 45 steel are stable
Coefficient of friction is 0.71~0.74, and applies electric spark deposition Ni-MoS2The stable coefficient of friction of No. 45 steel of self-lubricating coat in use
Only 0.15~0.16.The wear weight loss of No. 45 steel is 16.37mg, and applies electric spark deposition Ni-MoS2Self-lubricating coat in use
The wear weight loss of No. 45 steel is only 3.14mg.
Embodiment 3
Basis material uses Q235 steel, sinters composite material electricity into using nickel powder is repressed together with molybdenum disulfide powder
Pole, the mass ratio of nickel powder and molybdenum disulphide powder is 55:45 in electrode, suppresses 50 MPa of pressure, the sintering temperature of electrode after compacting
Degree is 1050 DEG C, sintering time 30min.
In the present embodiment, self-lubricating coat in use preparation step is as follows:
(1) first basis material is polished step by step according to the sand paper of 240#, 400#, 600#, 800#, removal matrix surface oxidation
Then film is polished with the abrasive pastes that granularity is 2.5 μm, then carry out ultrasonic cleaning 9min with acetone to remove surface oil
It is dirty；
(2) nickel and the composite electrode of molybdenum disulfide sintering are processed into Φ 5mm × 40mm column, and according to 240#,
The sand paper of 400#, 600#, 800# are polished step by step, remove matrix surface oxidation film, are then carried out with the abrasive pastes that granularity is 2.5 μm
Polishing then carries out ultrasonic cleaning 9min with acetone to remove surface and oil contaminant；
(3) electric spark deposition, specific process parameter are carried out under protection of argon gas are as follows: output power 1100W, output voltage
For 75V, electrode revolving speed 3000 turns/min, deposition rate 2min/cm2, argon flow 8L/min.
Wherein, the mass percentage of molybdenum dioxide is about 14% in self-lubricating coat in use, obtains the hardness of self-lubricating coat in use
About 6.10GPa.Using MFT-5000 friction wear testing machine, wherein fretting wear condition is reciprocal distance 6mm, reciprocating speed
5mm/sec, load 20N, fraction time 30min, opposite grinding part are the GCr15 steel ball of Φ 9.5mm.Through detecting, Q235 steel is stable
Coefficient of friction is 0.75~0.79, and applies electric spark deposition Ni-MoS2The stable coefficient of friction of the Q235 steel of self-lubricating coat in use
Only 0.19~0.20.The wear weight loss of Q235 steel is 17.62mg, and applies electric spark deposition Ni-MoS2Self-lubricating coat in use
The wear weight loss of Q235 steel is only 3.09mg.
Embodiment 4
Basis material uses 40Cr steel, sinters composite material electricity into using nickel powder is repressed together with molybdenum disulfide powder
Pole, the mass ratio of nickel powder and molybdenum disulphide powder is 65:35 in electrode, suppresses pressure 50MPa, the sintering temperature of electrode after compacting
It is 1050 DEG C, sintering time 30min.
In the present embodiment, self-lubricating coat in use preparation step is as follows:
(1) first basis material is polished step by step according to the sand paper of 240#, 400#, 600#, 800#, removal matrix surface oxidation
Then film is polished with the abrasive pastes that granularity is 2.5 μm, then carry out ultrasonic cleaning 12min with acetone to remove surface oil
It is dirty；
(2) nickel and the composite electrode of molybdenum disulfide sintering are processed into Φ 5mm × 40mm column, and according to 240#,
The sand paper of 400#, 600#, 800# are polished step by step, remove matrix surface oxidation film, are then carried out with the abrasive pastes that granularity is 2.5 μm
Polishing then carries out ultrasonic cleaning 12min with acetone to remove surface and oil contaminant；
(3) electric spark deposition, specific process parameter are carried out under protection of argon gas are as follows: output power 1200W, output voltage
For 80V, electrode revolving speed 2500 turns/min, deposition rate 3min/cm2, argon flow 11L/min.Wherein, self-lubricating coat in use
The mass percentage of middle molybdenum dioxide is about 15%, and the hardness for obtaining self-lubricating coat in use is about 6.92GPa.Using MFT-5000
Friction wear testing machine, wherein fretting wear condition is reciprocal distance 6mm, reciprocating speed 5mm/sec, load 20N, fraction time
30min, opposite grinding part are the GCr15 steel ball of Φ 9.5mm.Through detecting, the stable coefficient of friction of 40Cr steel is 0.78~0.81, and is applied
It is powered on spark deposition Ni-MoS2The coefficient of friction that the 40Cr steel of self-lubricating coat in use is stable is only 0.15~0.16.The mill of 40Cr steel
Weight losses is 16.43mg, and applies electric spark deposition Ni-MoS2The wear weight loss of the 40Cr steel of self-lubricating coat in use is only
2.95mg。
Embodiment 5
Basis material uses H13 steel, sinters composite electrode into using nickel powder is repressed together with molybdenum disulfide powder,
The mass ratio of nickel powder and molybdenum disulphide powder is 70:30 in electrode, suppresses 50 MPa of pressure, the sintering temperature of electrode is after compacting
1100 DEG C, sintering time 30min.
In the present embodiment, self-lubricating coat in use preparation step is as follows:
(1) first basis material is polished step by step according to the sand paper of 240#, 400#, 600#, 800#, removal matrix surface oxidation
Then film is polished with the abrasive pastes that granularity is 2.5 μm, then carry out ultrasonic cleaning 15min with acetone to remove surface oil
It is dirty；
(2) nickel and the composite electrode of molybdenum disulfide sintering are processed into Φ 5mm × 40mm column, and according to 240#,
The sand paper of 400#, 600#, 800# are polished step by step, remove matrix surface oxidation film, are then carried out with the abrasive pastes that granularity is 2.5 μm
Polishing then carries out ultrasonic cleaning 15min with acetone to remove surface and oil contaminant；
(3) electric spark deposition, specific process parameter are carried out under protection of argon gas are as follows: output power 1500W, output voltage
For 100V, electrode revolving speed 2000 turns/min, deposition rate 1.5min/cm2, argon flow 12L/min.
Wherein, the mass percentage of molybdenum dioxide is about 11% in self-lubricating coat in use, obtains the hardness of self-lubricating coat in use
About 5.52GPa.Using MFT-5000 friction wear testing machine, wherein fretting wear condition is reciprocal distance 6mm, reciprocating speed
5mm/sec, load 20N, fraction time 30min, opposite grinding part are the GCr15 steel ball of Φ 9.5mm.Through detecting, H13 steel is stable to rub
Wiping coefficient is 0.68~0.72, and applies electric spark deposition Ni-MoS2The coefficient of friction that the H13 steel of self-lubricating coat in use is stable is only
0.16~0.17.The wear weight loss of H13 steel is 14.59mg, and applies electric spark deposition Ni-MoS2The H13 steel of self-lubricating coat in use
Wear weight loss be only 2.98mg.
Embodiment the result shows that, self-lubricating coat in use of the present invention and steel matrix are the strong metallurgical bonding of binding force, molybdenum dioxide
The hardness for enhancing self-lubricating coat in use has excellent abrasion resistance properties by the self-lubricating coat in use that the technique obtains, easily controllable,
It is suitble to industrial applications.
Described above it is only a preferred and feasible embodiment of the present invention, and the interest field of the present invention cannot be limited to this,
The self-lubricating coat in use is applied to steel member surface, can significantly improve the abrasion resistance properties of steel member, can be used for petroleum, army
The fields such as work, electric power, aviation.Therefore, technical solution and technical thought under this invention make it is various other it is corresponding change and
Deformation still belongs within the protection scope that the present invention is covered.
Claims (6)
1. a kind of process for electric spark deposition preparation of the self-lubricating coat in use comprising molybdenum dioxide, which is characterized in that basis material is adopted
With steel, composite electrode made of electric spark deposition electricity consumption extremely nickel powder and molybdenum disulfide powder sintering, using electric spark deposition
Technology, on steel matrix surface, deposition includes the self-lubricating coat in use of molybdenum dioxide.
2. the process for electric spark deposition preparation of the self-lubricating coat in use described in accordance with the claim 1 comprising molybdenum dioxide, feature
Be, sinter composite electrode into using nickel powder is repressed together with molybdenum disulfide powder, in composite electrode nickel powder with
The mass ratio of molybdenum disulphide powder is (50~80): (20~50), suppresses 35~55MPa of pressure, the sintering temperature of electrode after compacting
Degree are as follows: 1000~1100 DEG C, 20~40min of sintering time.
3. the process for electric spark deposition preparation of the self-lubricating coat in use according to claim 1 or 2 comprising molybdenum dioxide, special
Sign is, the specific steps are as follows:
(1) first basis material is polished step by step according to the sand paper of 240#, 400#, 600#, 800#, removes matrix surface oxidation film,
Then it is polished with the abrasive pastes that granularity is 2.5 μm, then carries out 5~15min of ultrasonic cleaning with acetone to remove surface oil
It is dirty；
(2) composite electrode is first processed into the shape of suitable electric spark deposition clamping, and according to 240#, 400#, 600#,
The sand paper of 800# is polished step by step, removes electrode surface oxidation film, is then polished with the abrasive pastes that granularity is 2.5 μm, then
5~15min of ultrasonic cleaning is carried out with acetone to remove surface and oil contaminant；
(3) electric spark deposition, specific process parameter are carried out under protection of argon gas are as follows: output power is 800~1500W, output electricity
Pressure is 60~100V, and 2000~4000 turns/min of electrode revolving speed, deposition rate is 1~3min/cm2。
4. the process for electric spark deposition preparation of the self-lubricating coat in use described in accordance with the claim 3 comprising molybdenum dioxide, feature
It is, is changed simultaneously by chemical component or the change shield gas flow rate, or both that change electrode material, to adjust certainly
The content of molybdenum dioxide in lubricant coating.
5. the process for electric spark deposition preparation of the self-lubricating coat in use comprising molybdenum dioxide according to claim 4, feature
It is, the mass percentage of molybdenum dioxide is (5~20) %.
6. the process for electric spark deposition preparation of the self-lubricating coat in use described in accordance with the claim 3 comprising molybdenum dioxide, feature
It is, argon flow is 8~12L/min.
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| CN113445047A (en) * | 2021-05-31 | 2021-09-28 | 沈阳理工大学 | Electric spark deposition preparation method of self-lubricating coating containing fine-grained tungsten and tungsten disulfide |
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