CN109136916A - A kind of method that laser melting coating prepares graphene oxide alloys magnesium primary surface wearing layer - Google Patents
A kind of method that laser melting coating prepares graphene oxide alloys magnesium primary surface wearing layer Download PDFInfo
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- CN109136916A CN109136916A CN201811086625.9A CN201811086625A CN109136916A CN 109136916 A CN109136916 A CN 109136916A CN 201811086625 A CN201811086625 A CN 201811086625A CN 109136916 A CN109136916 A CN 109136916A
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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
- C23C24/00—Coating starting from inorganic powder
- C23C24/08—Coating starting from inorganic powder by application of heat or pressure and heat
- C23C24/10—Coating starting from inorganic powder by application of heat or pressure and heat with intermediate formation of a liquid phase in the layer
- C23C24/103—Coating with metallic material, i.e. metals or metal alloys, optionally comprising hard particles, e.g. oxides, carbides or nitrides
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Abstract
A kind of method of the graphene oxide alloys magnesium primary surface wearing layer of laser melting coating preparation, in water-less environment, Ti ion is adsorbed using hydro-thermal high pressure, and in the case where graphene oxide carries functional group's effect, and obtains anatase titanium dioxide GO@TiO2(anatase titanium dioxide in after baking).Gained powder and thin Fe powder, Al2O3 particle, Si powder and glycerine certain proportion adjust the mixed-powder for being mixed to get gluing state.Matrix magnesium alloy plate is polished with sand paper, and gluing state mixed-powder is uniformly applied to matrix face.Again with flame gun Quick uniform presintering powder in matrix surface.Then material is handled using laser melting coating.Magnesium alloy plate surface cladding material abrasion loss is low handled by the present invention and has had both the features such as surface hardness is high, and there are many reinforced phase such as Al2O3, SiC and GO etc., meanwhile, the present invention has many advantages, such as that simple, safety, low cost are easily operated and controllable.
Description
Technical field
The invention belongs to technical field of material.
Background technique
The two-dimensional material for the monoatomic layer thickness that graphene nanometer sheet is made of sp2 hydbridized carbon atoms, shows one
The unusual physical property of series.Graphene nanometer sheet causes physics, chemistry and materialogy because of its special two-dimensional structure
The great interest of boundary researcher, basic research and engineering Application Research in relation to graphene become research hotspot in recent years.
Since graphene has high intensity, tensile strength up to 130GPa, imply graphene have in material application study it is huge
Big application space.
Due to physical characteristics such as graphene intensity extremely outstanding, the increasing of its mechanical property is focused in current research more
By force, its excellent attribute in material abrasiveness and hardness is ignored.A large number of studies show that the correct selection of reinforced phase can be straight
Connect the wear-resisting property and hardness for improving composite material.And graphene oxide (GO) is due to the essential attribute of its carbon material, it is natural after
The speciality that its self-lubricating and preferable thermal diffusivity etc. are different from other reinforcing materials is held.Thus correctly use can be effectively
Reduce the loss of material.
Magnesium alloy is as a kind of light material, the advantages that due to its specific strength height and good earthquake-proof function, increasingly by and
Attention by industrial circle.However its disadvantage is also more prominent, since its surface oxidation is reticular structure, this makes magnesium alloy
Its corrosion resistance and polishing machine are poor, and which prevent further applying for magnesium alloy.To expand application field, magnesium is improved
The soft of alloy, corrosion resistance and wear-resisting property, this patent propose a kind of Laser Surface Modification Technology, pass through matching for alloyed powder
Than adjusting, graphene oxide is added in alloyed powder, cooperateed in technique ultrasound dispersion and ultrasound to the fragmentation of crystal grain with
Improve the hardness and wear-resisting property of Mg alloy surface.
However graphene oxide shows very poor wetability similar to the structure of CNT, this is directly resulted in and alloy-based
Body interface associativity is not strong, is unfavorable for the preparation of composite material.Thus, improve the wetability of itself and matrix and selects correct work
Process becomes the key using graphene oxide enhancing metal base grinding abrasion.
Graphene oxide, which improves wetability method, at present overlay coating etc., and such as chemical nickel plating, this method is mainly by carboxylic
The graphene of base is through sensitization plays, after activation, is put into plating in chemical plating fluid, as the progress of reaction can be in graphene oxide table
Face obtains graininess coating, but expensive, and commonly uses toxic reagent, not environmentally and high production cost, is not suitable for extensive
Production.
In publication CN106148949A, title are as follows: a kind of " laser-induction composite cladding graphene enhancing Ni3Ti
In the method for composite material ".Graphene is pre-processed using chemical plating to obtain the graphene of nickel plating.Powder is mixed again carries out routine
It is laser sintered.In fact this method due to chemical plating limitation, it is larger to human injury, and it also requires individually to graphene
Carboxylated, the production cycle is long, while utilizing is sintering process of dusting, higher for such powder waste degree, has certain office
It is sex-limited.
Therefore, still lack a kind of preparation skill of cost-effective mg-based material surface plating graphene oxide wearing layer at present
Art.
Summary of the invention
In order to overcome conventional oxidation graphene composite material to prepare molding technological difficulties, the object of the present invention is to provide one
The new deposition technology using graphene oxide enhancing mg-based material of kind.It is to add the methods of mixed-powder in substrate surface,
It is acted synergistically using laser melting coating and high-energy ultrasonic so that powder itself forms one layer of basis material protective layer with matrix, to reach
The corrosion resistance of reinforcing material and the process of polishing machine.The conventional surfaces treatment process such as plating are compared to, it has all
More advantages, such as applicable basis material range of choice is wide, cladding layer controllability is high, customization performance is strong, excellent bonding performance.
Laser cladding technology includes selection proportion, the control of environment and the determination of the technological parameter three crucial rings of powder
Section, these three links are all linked with one another, all directly affect the quality of product.
In the present invention, graphene oxide is pre-processed using hydro-thermal method, the rear gluing state for recycling glycerine is protected
The adhesion for holding its dispersibility and material reaches during the mixed powder of reduction due to inhomogeneities caused by different densities.
Concrete principle of the invention is to be increased by introducing titanium oxide or titanium elements in surface of graphene oxide with reaching
Carbon and magnesium alloy wetability, using the self-lubricating and extremely strong thermal conductivity of graphene oxide, so that the surface hardness of material is straight
Line improves, and simultaneously effective reduces the coefficient of friction of material surface and increases the wear stability of material.In addition, oxidation stone
Black alkene has TiO due to surface2Coating has a degree of high temperature protection to graphene oxide.Meanwhile under high temperature, silicon phase (Si)
Micro SiC is generated in situ with graphene oxide, and since it is generated to be internal, thus interfacial cleanliness binding performance is preferable.In addition,
Due to the effect of high-energy ultrasonic, pool depth can be increased to a certain extent, improve the dispersibility of reinforced phase and improve wetting.And
Due to the lasting progress of ultrasound, crystal grain itself is refined and rounding, can directly improve the hardness of material.And the oxidation being added
Then the surface in cladding process forms micro spinelle to alumina particles, further increases the wearability and hardness of material.
The present invention is achieved by the following technical solutions.
The method that a kind of laser melting coating of the present invention prepares graphene oxide alloys magnesium primary surface wearing layer, including with
Lower step.
(1) by graphene oxide in analysis straight alcohol the pre-dispersed 1 ~ 3h of ultrasound, temperature is room temperature, and whole-process control is anhydrous
Vapour.Proportion is strict controlled in 0.2 ~ 0.4g: 50ml.
(2) glycerine and tetraisopropyl titanate composition will be poured into through step (1) pretreated graphene oxide dispersion
Precursor liquid in seal, and again be ultrasonically treated 1 ~ 1.5h.Among these, glycerine and tetraisopropyl titanate volume ratio are 10:0.4
~1.2。
(3) forerunner's suspension through step (2) is imported in hydrothermal reaction kettle, wherein suspension volume accounts for the molten product of reaction kettle
35%~70%.Reaction kettle is integrally put into reacting furnace again and is heated, is warming up to 70~110 DEG C with 1~5 DEG C/min, heat preservation 1~
2h, then after being warming up to 175 ~ 180 DEG C with 1~3 DEG C/min, take out reaction kettle after keeping the temperature 10~15h；Reaction kettle should be air-cooled to room
Warm rear is openable.
(4) being taken out through solution obtained by step (3), centrifugal treating, and be repeatedly centrifuged by pouring into analysis straight alcohol to molten
Body is colourless, and revolving speed is controlled in 9000 ~ 16000rpm.Whole process sealing guarantees without steam.
(5) the mixed-powder vacuum drying that step (4) is obtained, after will be in the powder under protection of argon gas 450 ~ 500 DEG C
Roasting.The graphene oxide that surface has needle-shaped anatase type titanium oxide coating can be obtained in 1 ~ 3h in time control.
(6) powder obtained by step (5) is put into beaker and is added a certain amount of aluminium oxide, fine silica powder, and be added certain
The glycerine of amount, silicon powder control is total powder quality 4 ~ 8% among these, and the mass ratio of graphene oxide is 5 ~ 7.5%, alumina powder
End control is 1.5 ~ 3%, and size Control is 2 ~ 7 μm.Surplus is atomized aluminium, and size Control is 5 ~ 15 μm.Glycerine is total volume ratio
3 ~ 5%, this is crucial for stomata control, then with 1 ~ 3h of ultrasonic treatment, mixes powder process and keeps preferable aridity, finally obtain
The mixed-powder of gluing state.
(7) mg-based material alloy sheets are polished repeatedly with 1500 ~ 2000# sand paper, alcohol is cleaned by ultrasonic and dries.After will be
Gluing state mixed-powder obtained by step (6) is uniformly applied to aluminium material surface, and prefabricated thickness control is 0.5 ~ 1.2mm.Flame is used again
Rifle Quick uniform presintering powder is in matrix surface.
(9) aluminium alloy plate obtained by step (8) is put into argon gas guard box, magnesium plate, which should be fixed on bottom, among these high energy
It is fixed on the titanium alloy plate of ultrasound and with fixture.
(10) step (9) resulting materials are put into argon gas guard box, material is handled using laser melting coating.Its work
Skill state modulator are as follows: laser power is 0.9 ~ 1.2Kw, and scanning speed is 8 ~ 15mm/s, and spot diameter is that 2 ~ 6mm inclines among these
Oblique angle is more crucial, and controlling is 10 ~ 20 °.In cladding process, high-energy ultrasonic collaboration is carried out, and power is controllably under 0.3 ~ 1.0Kw
20 ~ 10 kHz be segmented multiple frequency ultrasonic method, rate of change is about that the variation of 0.5S frequency is primary.
Hydrothermal reaction kettle liner described in step (3) of the present invention is polytetrafluoroethylene (PTFE).
The present invention have following technical effect that (1) the method reduce in conventional blending processes of powders since density variation causes
Lamination.(2) the conventional caused dust pollution that dusts can be reduced using the viscosity of lipid itself, it is more environmentally-friendly.(3)
This method reaction laser power is not high, and danger coefficient is low.(4) there is the graphene oxide of transition zone in mg-based material surface half and base
Body combines, and while having more preferable interface, further reduces graphene oxide reunion probability.(5) method introduces high-energy ultrasonic,
The dispersion and wetability of graphene oxide can further be improved.(6) being introduced into for high-energy ultrasonic can be in melt process of setting
Further rounding magnesium matrix crystal grain, is allowed to more fine uniform, can directly improve material surface hardness.
Specific embodiment
The present invention will be described further by following embodiment.
Embodiment 1.
By graphene oxide in analysis straight alcohol the pre-dispersed 1h of ultrasound, temperature is room temperature, and whole-process control is without steam.Volume
Than being strict controlled in 0.2:50, after that gained dispersion liquid poured into sealing in the precursor liquid of glycerine and tetraisopropyl titanate composition is super
Sonication 1h.Among these, glycerine and tetraisopropyl titanate volume ratio are 10:0.4.Hydro-thermal process is carried out later, wherein suspended
Liquid product accounts for the molten product 50% of reaction kettle.Place into reacting furnace and heat, be warming up to 90 DEG C with 5 DEG C/min, keep the temperature 2h, then with 3 DEG C/
After min is warming up to 180 DEG C, 10h is kept the temperature.It is air-cooled after taking-up reaction kettle.Gained solution takes out, centrifugal treating, and by pouring into point
Analysis straight alcohol is repeatedly centrifuged colourless to solution.Whole process sealing guarantees without steam.It afterwards will be in gained powder under protection of argon gas 450 DEG C
Roasting.Time controls in 2h.The graphene oxide that surface has needle-shaped anatase type titanium oxide coating can be obtained.
Later by gained powder and alumina particle, silicon powder matches in beaker, and a certain amount of glycerine is added.Silicon powder
Control is total powder quality about 5%, and the mass ratio of graphene oxide is 5%, and alumina powder control is 1.5%, about 3 μm of size.It is remaining
Amount is atomized aluminium, and size Control is about 5 μm.Glycerine is the 3% of total volume ratio, and processing whole process is used at ultrasound without steam, and then
Manage 1h.Obtain the mixed-powder of gluing state.AM60 1500 ~ 2000# sand paper is polished, alcohol washes drying.Gained gluing
State mixed-powder is uniformly applied to matrix surface, and prefabricated thickness control is 0.7mm.Flame gun Quick uniform presintering powder is used again
In matrix surface.Material is handled using laser melting coating and ultrasound in argon gas guard box later.Its process parameter control
Are as follows: laser power 0.9Kw, scanning speed 8mm/s, spot diameter 3mm, among these, inclination angle control are 10 °.High energy
Ultrasound is that 0.3Kw and 20 ~ 10 kHz is segmented multifrequency, and rate of change is about that the variation of 0.5S frequency is primary.
Embodiment 2.
By graphene oxide in the analysis straight alcohol clock pre-dispersed 3h of ultrasound, temperature is room temperature, and whole-process control is without steam.Volume
Than being strict controlled in 0.2:50, after that gained dispersion liquid poured into sealing in the precursor liquid of glycerine and tetraisopropyl titanate composition is super
Sonication 1h.Among these, glycerine and tetraisopropyl titanate volume ratio are 10:0.8.Hydro-thermal process is carried out later, wherein suspended
Liquid product accounts for the molten product 50% of reaction kettle.Place into reacting furnace and heat, be warming up to 90 DEG C with 3 DEG C/min, keep the temperature 1h, then with 2 DEG C/
After min is warming up to 180 DEG C, 12h is kept the temperature.It is air-cooled after taking-up reaction kettle.Gained solution takes out, centrifugal treating, and by pouring into point
Analysis straight alcohol is repeatedly centrifuged colourless to solution.Whole process sealing guarantees without steam.It afterwards will be in gained powder under protection of argon gas 450 DEG C
Roasting.Time controls in 1h.The graphene oxide that surface has needle-shaped anatase type titanium oxide coating can be obtained.
Later by gained powder and alumina particle, silicon powder matches in beaker, and a certain amount of glycerine is added.Silicon powder
Control is total powder quality 7%, and the mass ratio of graphene oxide is 6%, and alumina powder control is 2%, about 5 μm of size.Surplus is
Atomized aluminium, size Control are about 7 μm.Glycerine is the 4% of total volume ratio, and processing whole process then uses ultrasonic treatment without steam
2h.Obtain the mixed-powder of gluing state.AZ61 1500 ~ 2000# sand paper is polished, alcohol washes drying.Gained gluing state
Mixed-powder is uniformly applied to matrix surface, and prefabricated thickness control is 0.9mm.Again with flame gun Quick uniform presintering powder in
Matrix surface.Material is handled using laser melting coating and ultrasound in argon gas guard box later.Its process parameter control are as follows:
Laser power is 1.2Kw, scanning speed 10mm/s, spot diameter 4mm, and among these, inclination angle control is 15 °.High energy is super
Sound is that 0.6Kw and 20 ~ 10 kHz is segmented multifrequency, and rate of change is about that the variation of 0.5S frequency is primary.
Claims (1)
1. a kind of method that laser melting coating prepares graphene oxide alloys magnesium primary surface wearing layer, feature the following steps are included:
(1) by graphene oxide in analysis straight alcohol the pre-dispersed 1 ~ 3h of ultrasound, temperature is room temperature, and whole-process control is matched without steam
Than being strict controlled in 0.2 ~ 0.4g: 50ml；
(2) before glycerine and tetraisopropyl titanate composition will be poured into through step (1) pretreated graphene oxide dispersion
It drives in liquid and seals, and be ultrasonically treated 1 ~ 1.5h again, glycerine and tetraisopropyl titanate volume ratio are 10:0.4 ~ 1.2；
(3) forerunner's suspension through step (2) is imported in hydrothermal reaction kettle, wherein suspension volume accounts for the molten product 35% of reaction kettle
~70%；Reaction kettle is integrally put into reacting furnace again and is heated, is warming up to 70~110 DEG C with 1~5 DEG C/min, keeps the temperature 1~2h, then
After being warming up to 175 ~ 180 DEG C with 1~3 DEG C/min, reaction kettle is taken out after keeping the temperature 10~15h, reaction kettle is air-cooled to room temperature；
(4) being taken out through solution obtained by step (3), centrifugal treating, and by pour into analysis straight alcohol be repeatedly centrifuged to solution without
Color, revolving speed are controlled in 9000 ~ 16000rpm；Whole process sealing guarantees without steam；
(5) the mixed-powder vacuum drying that step (4) is obtained, after will be roasted in the powder under protection of argon gas 450 ~ 500 DEG C,
Time controls in 1 ~ 3h；The graphene oxide that surface has needle-shaped anatase type titanium oxide coating can be obtained；
(6) powder obtained by step (5) is put into beaker and an aluminium oxide, fine silica powder is added, and glycerine is added, in which: silicon
Powder control is total powder quality 4 ~ 8%, and the mass ratio of graphene oxide is 5 ~ 7.5%, and alumina powder control is 1.5 ~ 3%, size
Control is 2 ~ 7 μm, and surplus is atomized aluminium, and size Control is 5 ~ 15 μm；Glycerine is the 3 ~ 5% of total volume ratio, this is stomata control
Key mixes powder process and keeps drying, obtain the mixed-powder of gluing state then with 1 ~ 3h of ultrasonic treatment；
(7) mg-based material alloy sheets are polished repeatedly with 1500 ~ 2000# sand paper, alcohol is cleaned by ultrasonic and dries, then will be step
Suddenly gluing state mixed-powder obtained by (6) is uniformly applied to aluminium material surface, and prefabricated thickness control is 0.5 ~ 1.2mm, then uses flame gun
Quick uniform presintering powder is in matrix surface；
(9) aluminium alloy plate obtained by step (8) is put into argon gas guard box, wherein magnesium plate is fixed on the titanium that high-energy ultrasonic is arranged at bottom
It is fixed on sheet alloy and with fixture；
(10) step (9) resulting materials are put into argon gas guard box, material is handled using laser melting coating；Its technique ginseng
Numerical control is made as: laser power is 0.9 ~ 1.2Kw, and scanning speed is 8 ~ 15mm/s, and spot diameter is 2 ~ 6mm, among these, inclination angle
More crucial, controlling is 10 ~ 20 °；In cladding process, high-energy ultrasonic collaboration is carried out, and power is controllably 20 under 0.3 ~ 1.0Kw
~ 10 kHz are segmented multiple frequency ultrasonic method, and rate of change is about that the variation of 0.5S frequency is primary；
Hydrothermal reaction kettle liner described in step (3) is polytetrafluoroethylene (PTFE).
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112063951A (en) * | 2020-08-13 | 2020-12-11 | 张家港润盛科技材料有限公司 | Magnesium-aluminum alloy surface laser cladding self-lubricating coating and construction method thereof |
| CN114086175A (en) * | 2021-11-24 | 2022-02-25 | 上海交通大学 | Method for improving toughness of laser melting deposition aluminum alloy formed part |
| CN114134552A (en) * | 2021-12-07 | 2022-03-04 | 徐州工程学院 | Method for constructing fluorescent gradient coating on surface of magnesium alloy |
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