CN105256306A - Manufacturing method for high-density cold spraying metal sedimentary body based on mixed powder - Google Patents
Manufacturing method for high-density cold spraying metal sedimentary body based on mixed powder Download PDFInfo
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- 229910052751 metal Inorganic materials 0.000 title claims abstract description 94
- 239000002184 metal Substances 0.000 title claims abstract description 94
- 239000011812 mixed powder Substances 0.000 title claims abstract description 47
- 238000010288 cold spraying Methods 0.000 title claims abstract description 27
- 238000004519 manufacturing process Methods 0.000 title abstract description 4
- 239000000843 powder Substances 0.000 claims abstract description 146
- 125000002887 hydroxy group Chemical group [H]O* 0.000 claims abstract description 39
- 238000000576 coating method Methods 0.000 claims abstract description 38
- 239000007921 spray Substances 0.000 claims abstract description 34
- 239000011248 coating agent Substances 0.000 claims abstract description 33
- 238000000034 method Methods 0.000 claims abstract description 21
- 238000005507 spraying Methods 0.000 claims abstract description 5
- 238000002360 preparation method Methods 0.000 claims description 19
- 239000007789 gas Substances 0.000 claims description 18
- 239000011159 matrix material Substances 0.000 claims description 17
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 14
- 239000002245 particle Substances 0.000 claims description 13
- 230000008569 process Effects 0.000 claims description 11
- 239000003570 air Substances 0.000 claims description 7
- 229910052757 nitrogen Inorganic materials 0.000 claims description 7
- 239000001307 helium Substances 0.000 claims description 6
- 229910052734 helium Inorganic materials 0.000 claims description 6
- SWQJXJOGLNCZEY-UHFFFAOYSA-N helium atom Chemical group [He] SWQJXJOGLNCZEY-UHFFFAOYSA-N 0.000 claims description 6
- 239000000203 mixture Substances 0.000 claims description 6
- 238000002203 pretreatment Methods 0.000 claims description 5
- 238000010438 heat treatment Methods 0.000 claims description 4
- 238000007788 roughening Methods 0.000 claims description 4
- 238000005488 sandblasting Methods 0.000 claims description 4
- 239000007787 solid Substances 0.000 claims description 4
- 230000015572 biosynthetic process Effects 0.000 claims description 3
- 238000002156 mixing Methods 0.000 claims description 3
- 239000012459 cleaning agent Substances 0.000 claims description 2
- 238000005202 decontamination Methods 0.000 claims description 2
- 230000003588 decontaminative effect Effects 0.000 claims description 2
- 230000000694 effects Effects 0.000 abstract description 27
- 239000000463 material Substances 0.000 abstract description 13
- 230000008021 deposition Effects 0.000 abstract description 12
- 239000011148 porous material Substances 0.000 abstract description 6
- 230000000903 blocking effect Effects 0.000 abstract description 4
- 230000007547 defect Effects 0.000 abstract 1
- 238000005868 electrolysis reaction Methods 0.000 description 42
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 29
- 239000010949 copper Substances 0.000 description 23
- 238000004062 sedimentation Methods 0.000 description 20
- 238000000151 deposition Methods 0.000 description 13
- 238000012387 aerosolization Methods 0.000 description 11
- 238000000889 atomisation Methods 0.000 description 10
- 241000555268 Dendroides Species 0.000 description 8
- 230000001133 acceleration Effects 0.000 description 8
- 230000001788 irregular Effects 0.000 description 7
- 230000007797 corrosion Effects 0.000 description 5
- 238000005260 corrosion Methods 0.000 description 5
- 238000005516 engineering process Methods 0.000 description 5
- CSCPPACGZOOCGX-UHFFFAOYSA-N Acetone Chemical compound CC(C)=O CSCPPACGZOOCGX-UHFFFAOYSA-N 0.000 description 4
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 3
- 230000008901 benefit Effects 0.000 description 3
- 238000009826 distribution Methods 0.000 description 3
- 239000003792 electrolyte Substances 0.000 description 3
- 238000012360 testing method Methods 0.000 description 3
- 229910052593 corundum Inorganic materials 0.000 description 2
- 239000010431 corundum Substances 0.000 description 2
- 230000003647 oxidation Effects 0.000 description 2
- 238000007254 oxidation reaction Methods 0.000 description 2
- 239000012254 powdered material Substances 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 239000004576 sand Substances 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 229910001220 stainless steel Inorganic materials 0.000 description 2
- 239000011800 void material Substances 0.000 description 2
- 238000010146 3D printing Methods 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 239000000443 aerosol Substances 0.000 description 1
- 230000032683 aging Effects 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000000280 densification Methods 0.000 description 1
- 238000009713 electroplating Methods 0.000 description 1
- 230000003628 erosive effect Effects 0.000 description 1
- 229910001385 heavy metal Inorganic materials 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 239000002923 metal particle Substances 0.000 description 1
- 239000010814 metallic waste Substances 0.000 description 1
- 230000007935 neutral effect Effects 0.000 description 1
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- 230000001737 promoting effect Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 239000012266 salt solution Substances 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 238000005480 shot peening Methods 0.000 description 1
- 230000035882 stress Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
- 238000007751 thermal spraying Methods 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
Classifications
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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
- C23C24/02—Coating starting from inorganic powder by application of pressure only
- C23C24/04—Impact or kinetic deposition of particles
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- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Coating By Spraying Or Casting (AREA)
Abstract
The invention discloses a manufacturing method for a high-density cold spraying metal sedimentary body based on mixed powder and belongs to the technical field of material engineering. The method includes the following steps that firstly, conventional atomized metal powder and ionized metal powder or hydroxyl metal powder are mechanically mixed to manufacture the mixed powder, wherein the conventional atomized metal powder and the ionized metal powder or the hydroxyl metal powder adopt the same metal components; and secondly, the surface of a base body or the surface of a workpiece to be sprayed is pretreated, the mixed powder serves as spraying powder, a coating or a blocky material is deposited through a cold spraying method. By the adoption of the method, the characteristic that the deposition efficiency of the electrolyzed/hydroxyl metal powder is high is maintained, the defects that the electrolyzed/hydroxyl metal powder is pool in fluidity and prone to blocking a spray gun are overcome, pores in the deposited electrolyzed/hydroxyl metal powder are closed through the strong tamping effect generated by impact of conventional atomized powder, and the completely-dense metal sedimentary body is obtained.
Description
Technical field
The invention belongs to field of material engineering technology, be specifically related to a kind of preparation method of the high-compactness cold spraying metal lithosomic body based on mixed powder.
Background technology
Cold spraying (ColdSpraying, CS) is a kind of based on gas dynamical material technology.By being sent into by the particle of micro-meter scale in the high velocity air in spray gun, through accelerating, make it complete solid-state lower high-speed impact matrix (300-1200m/s), the viscous deformation violent by particle/basal body interface and realize deposition of material.Lower depositing temperature makes when oxysensible materials such as depositing metal particles, farthest can avoid the oxidation of particle in accelerator, make the metal of the pure non-oxidation of preparation, alloy coat becomes possibility, especially be suitable for temperature sensitive, oxidizable, the material of easy phase transformation.Under Optimizing Process Parameters condition, high fine and close lithosomic body (porosity <1%) can be obtained by cold spraying.This feature make cold spraying metallic coating heat conduction, conduction, anticorrosion etc. in be with a wide range of applications.In addition, different from the residual tension formed in conventional thermal spraying material, the stress that in cold spraying particle high velocity impact process, shot-peening effect produces makes in coating preparation process unrestricted on thickness direction.Therefore, cold spraying is also one of effective ways increasing material manufacture (3D printing).
For specific spray material, cold spraying deposition existence critical velocity, only has when the speed of particle is higher than critical velocity, and particle could produce effectively deposition, otherwise produces erosion effect to base material.For certain material, critical velocity depends primarily on the mechanical attribute of powder, and powder softer (yield strength is lower), critical velocity is lower, and powder more easily deposits.Sedimentation effect refers to that the powder of deposition accounts for the ratio striking substrate surface powder.The higher powder using efficiency of sedimentation effect is higher.Therefore, improve sedimentation effect to realize mainly through two kinds of modes: improve the speed of powder and/or reduce critical velocity.The speed improving powder needs raising accelerate the pressure and temperature of gas or substitute conventional nitrogen, pressurized air as acceleration gas using helium.By pre-heating powder, the temperature improving powder can make metal-powder that significant softening effect occurs, and therefore significantly can reduce critical velocity.These two kinds of approach are also the methods generally adopted at present for improving sedimentation effect.But significantly improve and accelerate the pressure and temperature of gas and improve the consumption of gas, accelerate the cost intensive (being about nitrogen 40 times) of aging, the helium of equipment; Powder preheating easily makes powder in spray gun inwall deposition, blocking spray gun.Completely above-mentioned requirements is not reached for some portable low pressure cold spraying equipments.Therefore, how the raising realizing metal-powder sedimentation effect of low cost is the key factor promoting cold spray technique industrialization further.
Electrolysis or hydroxy metal powder have the feature of irregular profile and internal porous, and irregular profile makes it obtain the towing force larger than conventional ball powder in air-flow accelerator, thus obtains higher speed; The feature of internal porous makes its hardness significantly lower than solid powder, therefore result in the remarkable reduction of critical velocity.Under same process Parameter Conditions, above two factors make electrolysis or hydroxy metal powder have the sedimentation effect being significantly higher than conventional atomized powder.But study discovery further, the hole of initial electrolysis or hydroxy metal powder inside can remain after deposit, causes there is a large amount of holes in lithosomic body, has had a strong impact on the heat conduction of lithosomic body, conduction and corrosion resistance nature.On the other hand, irregular profile make electrolysis or hydroxy metal powder flowbility poor, have a strong impact on powder conveying homogeneity, cause condensate surface situation poor, spray gun also can be caused simultaneously to block.
Therefore, while guarantee electrolysis or this advantage of hydroxy metal powder height sedimentation effect, how the rate that significantly improves realizing powder flowbility and coating density of low cost waits at present to solve important technological problems.
Summary of the invention
The problem simultaneously being obtained high-compactness lithosomic body and high sedimentation effect by cold spray technique is difficult to for conventional atomized metal pow der, the object of the present invention is to provide a kind of preparation method of the high-compactness cold spraying metal lithosomic body based on mixed powder, the method has the advantage that sedimentation effect is high and lithosomic body density is high concurrently, and with low cost, be applicable to amplifying and produce.
The present invention is achieved through the following technical solutions:
The invention discloses a kind of preparation method of the high-compactness cold spraying metal lithosomic body based on mixed powder, comprise the following steps:
1) conventional atomized metal pow der and ionized metal powder or hydroxy metal powder are carried out mechanically mixing, obtained mixed powder; Wherein, conventional atomized metal pow der and ionized metal powder or hydroxy metal powder adopt same metal composition;
2) pre-treatment is carried out to matrix surface or workpiece surface to be sprayed, then using mixed powder as dusty spray, adopt cold spray process deposited coatings or bulk.
In mixed powder, the volume of conventional atomized metal pow der is 20% ~ 80% of mixed powder quality.
The particle diameter of described conventional atomized metal pow der is 5 ~ 50 μm.
The particle diameter of described ionized metal powder or hydroxy metal powder is 5 ~ 50 μm.
Step 2) pre-treatment is carried out to matrix surface or workpiece surface to be sprayed, concrete operations are: adopt industrial cleaning agent clean the greasy dirt of matrix surface or workpiece surface to be sprayed and pollutent and dry, then carry out sandblasting roughening treatment to the surface after decontamination.
Described cold spray process be by a high speed, mixed powder accelerates by the gas of high pressure, heating, the viscous deformation formation of deposits coating that mixed powder is produced by high-speed impact matrix surface or workpiece surface to be sprayed under solid conditions or bulk.
In spraying process, the gas of high speed used, high pressure is helium, nitrogen or air.
Compared with prior art, the present invention has following useful technique effect:
The present invention is using conventional atomized metal pow der and ionized metal powder or the mixed mixed powder of the hydroxy metal powder dusty spray as cold spraying, compared with conventional ball atomized metal pow der, under identical spray parameters condition, the irregular profile of electrolysis or hydroxy metal powder can make it obtain higher flight velocity, the pore texture of the inside of electrolysis or hydroxy metal powder makes it have lower critical velocity, therefore there is higher sedimentation effect, but the reservation of the part of powder internal void causes lithosomic body porosity higher, have a strong impact on conduction, heat conduction and corrosion resistance nature.But the poor powder feeding homogeneity that causes of the mobility of irregular profile powder (electrolysis or hydroxy metal powder) is difficult to ensure and easily block spray gun.The present invention by adding the conventional atomized metal pow der of certain proportion in electrolysis/hydroxy metal powder, conventional atomized metal pow der in mixed powder is when high-speed impact deposit electrolyte/hydroxy metal powder, existence due to hole makes electrolysis/hydroxy metal powder softer (lower yield strength), therefore, viscous deformation mainly occurs in the electrolysis/hydroxy metal powder side with pore texture, thus make the closing of pores, overcome the shortcoming that when adopting merely electrolysis/hydroxy metal powder, lithosomic body porosity is higher, realize the high-compactness of lithosomic body.The inventive method had both remained the feature that electrolysis/hydroxy metal powder deposition efficiency is higher, solve again the shortcoming of the poor and easy blocking spray gun of electrolysis/hydroxy metal powder flowbility, clashing into by conventional atomized powder the strong compacting effect caused makes the hole in deposit electrolyte/hydroxy metal powder be closed, thus has obtained fully dense metal lithosomic body.
Further, in mixed powder, the volume of conventional atomized metal pow der is 20% ~ 80% of mixed powder quality, and content is relevant with powdered material attribute, particularly mechanical characteristic, can adjust as required.
Further, the particle diameter of conventional atomized metal pow der, ionized metal powder or hydroxy metal powder is 5 ~ 50 μm, can ensure that mixed powder has good mobility and acceleration characteristics concurrently.
Accompanying drawing explanation
Fig. 1 is the pattern of Conventional aerosol Cu powder and dendroid electrolysis Cu powder;
Wherein, (a) is the shape appearance figure of conventional atomization Cu powder; B () is the shape appearance figure of dendroid electrolysis Cu powder;
Fig. 2 is the cold spraying lithosomic body section microstructure of each powder under identical parameters condition;
Wherein, (a) is pure aerosolization Cu powder; B () is for aerosolization Cu powder and dendroid electrolysis Cu powder are according to the mixed C u powder of 1:1; C () is pure electrolysis Cu powder;
Fig. 3 is sedimentation effect and the lithosomic body porosity result of variations with atomized powder content in mixed powder;
Fig. 4 is the result of variations of lithosomic body specific conductivity with atomized powder content in mixed powder;
Fig. 5 is the section of the pattern of the sectional drawing of electrolytic nickel powder and aerosolization nickel powder, (a) electrolytic nickel powder, (b) electrolytic nickel powder, the pattern of (c) aerosolization nickel powder, the section of (d) aerosolization nickel powder;
Fig. 6 is the coating sectional drawing adopting different nickel powder deposition, and (a) prepares coating, the coating of (b) atomization, electrolysis mixed powder deposition, the coating that (c) deposits for pure electrolytic nickel powder for pure aerosolization nickel powder;
Fig. 7 is that powder deposition efficiency and coating porosity are with electrolytic nickel powder quality change figure in powder.
Embodiment
Below in conjunction with specific embodiment, the present invention is described in further detail, and the explanation of the invention is not limited.
The high efficiency preparation method of the high-compactness cold spraying metal lithosomic body based on mixed powder disclosed by the invention, implemented by following steps:
Dusty spray is mixed according to certain ratio (20%-80%) between the atomized metal pow der of the routine of 5-50 μm and the dendroid electrolysis of composition of the same race or hydroxy metal powder size distribution.Using this kind of mixed powder as the dusty spray of cold spraying, compared with conventional ball atomized metal pow der, under identical spray parameters condition, the irregular profile of electrolysis or hydroxy metal powder can make it obtain higher flight velocity; The pore texture of the inside of electrolysis or hydroxy metal powder makes it have lower critical velocity.Therefore there is higher sedimentation effect, but the reservation of the part of powder internal void causes lithosomic body porosity higher, has a strong impact on conduction, heat conduction and corrosion resistance nature.Meanwhile, the poor powder feeding homogeneity that causes of the mobility of irregular profile powder is difficult to ensure and easily block spray gun.
The present invention by adding the method for the conventional atomized metal pow der of certain proportion in electrolysis/hydroxy metal powder, both the feature that electrolysis/hydroxy metal powder deposition efficiency is higher had been remained, solve again the shortcoming of the poor and easy blocking spray gun of electrolysis/hydroxy metal powder flowbility, simultaneously clashing into by conventional atomized powder the strong compacting effect caused makes the hole in deposit electrolyte/hydroxy metal powder be closed, thus obtained fully dense metal lithosomic body, form the present invention thus with undefined high sedimentation effect, low porosity.
Preparation process one, by having identical component, granularity carries out sufficient mechanically mixing, using mixed powder as dusty spray between the conventional atomized metal pow der of 5-50 μm and electrolysis/hydroxy metal powder.
Preparation process two, carries out pre-treatment to matrix surface or workpiece surface to be sprayed.
Preparation process three, using mixed powder as dusty spray, adopts cold spraying deposited coatings or component.
Other advantages also had of the present invention are:
1, the conventional atomized metal pow der in mixed powder is identical with electrolysis/hydroxy metal powder chemistry composition, therefore can not introduce other elements while realizing high sedimentation effect and high-compactness, changes lithosomic body chemical composition.
2, do not need to adopt expensive helium as acceleration gas; Do not need the pressure of raising acceleration gas, temperature to improve sedimentation effect and coating density, the price of electrolysis/hydroxy metal powder is generally lower than congruent atomized metal pow der simultaneously.Therefore present invention achieves the low cost preparation of high-compactness metallic coating.
3, cold spray-coating method be by a high speed, powdered material accelerates by the gas of high pressure, heating, the viscous deformation formation of deposits coating that powder is produced by high-speed impact matrix surface under solid conditions or bulk.Acceleration gas used in spraying process can be high pressure nitrogen or pressurized air.
Embodiment 1
Metal fine copper, owing to having high electric conductivity and thermal conductivity, therefore widely uses as conduction and conducting-heat elements.For Cu system, tumbling ball mill is adopted the size distribution as shown in (a), (b) in Fig. 1 to be spherical atomization Cu powder and the dendroid electrolysis Cu powder of 10-30 μm, fully mix according to the mass ratio of 3:1,1:1,1:3 respectively, the mixed powder needed for acquisition.
As a comparison, pure atomization Cu powder is adopted under identical spray parameters condition, to prepare coating with pure electrolysis Cu powder respectively.Thickness is selected to be that 304 stainless steels of 3mm are as matrix, spray front acetone clean matrix surface and dry, adopt the corundum sand of 40# again, be, under the condition of 0.6MPa, sandblasting roughening treatment is carried out to matrix surface at compressed air pressure, make roughness reach Ra1.0-4.0.Using nitrogen as acceleration gas, be 3MPa at gaseous tension, gas temperature is 450 DEG C, and powder feeding rate is 1g/min, and spray gun translational speed is 80mm/s, and spray distance is deposited coatings under the Parameter Conditions of 20mm.
As shown in Figure 2, wherein, (a) is pure aerosolization Cu powder to typical coating section microstructure; B () is for aerosolization Cu powder and dendroid electrolysis Cu powder are according to the mixed C u powder of 1:1; C () is pure electrolysis Cu powder; Contrast can find, the hole of the coating black of mass ratio prepared by the mixed powder of 1:1 is minimum.Lithosomic body prepared by pure electrolysis Cu powder is owing to remaining the hole in part initial powder, and therefore porosity is the highest.There is the powder interface hole caused due to spherical Cu powder distortion deficiency in lithosomic body prepared by pure atomization Cu powder, therefore porosity is also relatively high.As shown in Figure 3, sedimentation effect raises along with the increase of electrolysis Cu content of powder in mixed powder, and the sedimentation effect of pure spherical powder is 31.6%, and when the ratio of spherical copper powder and dendroid copper powder is 1:1, coating sedimentation effect is brought up to and is about 50%.As shown in Figure 4, porosity test result shows, when the content of electrolysis Cu powder is 20% ~ 80%, coating porosity is in lower level, is about 1%.Coated conductive rate test result and porosity test result height meet.When porosity is in lower level, the electric conductivity of coating is relatively high, is about 63%IACS.
Embodiment 2
Research shows, pure Ni coating has excellent resistance to neutral salt solution, resistance to acid solution and high temperature resistant molten salt corrosion characteristic.With electroplating technology prepare Ni coating produce a large amount of containing heavy metal waste liquid unlike, can not cause the pollution of environment in cold spray process, be a kind of material preparation technology of green.The compactness of coating is most important to corrosive nature.But research shows, adopt conventional atomization Ni powder, only have when adopting expensive helium as acceleration gas, or with special device powder is preheating to more than 600 DEG C under higher velocity of particle (>600m/s) the Ni coating of densification could be obtained.
See Fig. 5, wherein, the pattern of (a) electrolytic nickel powder, the section of (b) electrolytic nickel powder, the pattern of (c) aerosolization nickel powder, d the section of () aerosolization nickel powder, adopts tumbling ball mill size distribution to be the spherical atomization Ni powder of 10-45 μm and dendroid electrolysis Ni powder fully mixes according to the mass ratio of 3:1,1:1,1:3, the mixed powder needed for acquisition.
As a comparison, pure atomization Ni powder is adopted under identical spray parameters condition, to prepare coating with pure electrolysis Ni powder respectively.Thickness is selected to be that 304 stainless steels of 3mm are as matrix, spray front acetone clean matrix surface and dry, adopt the corundum sand of 40# again, be, under the condition of 0.6MPa, sandblasting roughening treatment is carried out to matrix surface at compressed air pressure, make roughness reach Ra1.0-4.0.Using nitrogen as acceleration gas, be 2.5MPa at gaseous tension, gas temperature is 500 DEG C, and powder feeding rate is 22g/min, and spray gun translational speed is 100mm/s, and spray distance is deposited coatings under the Parameter Conditions of 20mm.As shown in Figure 6, wherein, (a) prepares coating for pure aerosolization nickel powder to typical coating section microstructure, the coating of (b) atomization, electrolysis mixed powder deposition, the coating that (c) deposits for pure electrolytic nickel powder.Adopt pure atomization Ni powder with this understanding, particle can not effectively deposit, and does not form coating.There is a large amount of micro-pores in the coating adopting pure electrolysis Ni powder to prepare, and the coat inside adopting mixed powder to prepare does not find obvious hole.Sedimentation effect and coating porosity with electrolysis Ni powder content in mixed powder variation relation as shown in Figure 7, can find, sedimentation effect raises with the increase of electrolysis Ni powder content, and when electrolysis Ni powder content is between 25%-75%, the porosity of coating porosity is all less than 1%, ensures that it has excellent corrosion resistance nature.Therefore, can consider according to concrete Service Environment and comprehensive cost the processing parameter selecting the best.
Claims (7)
1., based on a preparation method for the high-compactness cold spraying metal lithosomic body of mixed powder, it is characterized in that, comprise the following steps:
1) conventional atomized metal pow der and ionized metal powder or hydroxy metal powder are carried out mechanically mixing, obtained mixed powder; Wherein, conventional atomized metal pow der and ionized metal powder or hydroxy metal powder adopt same metal composition;
2) pre-treatment is carried out to matrix surface or workpiece surface to be sprayed, then using mixed powder as dusty spray, adopt cold spray process deposited coatings or bulk.
2. the preparation method of the high-compactness cold spraying metal lithosomic body based on mixed powder according to claim 1, it is characterized in that, in mixed powder, the volume of conventional atomized metal pow der is 20% ~ 80% of mixed powder quality.
3. the preparation method of the high-compactness cold spraying metal lithosomic body based on mixed powder according to claim 1, it is characterized in that, the particle diameter of described conventional atomized metal pow der is 5 ~ 50 μm.
4. the preparation method of the high-compactness cold spraying metal lithosomic body based on mixed powder according to claim 1, it is characterized in that, the particle diameter of described ionized metal powder or hydroxy metal powder is 5 ~ 50 μm.
5. the preparation method of the high-compactness cold spraying metal lithosomic body based on mixed powder according to claim 1, it is characterized in that, step 2) pre-treatment is carried out to matrix surface or workpiece surface to be sprayed, concrete operations are: adopt industrial cleaning agent clean the greasy dirt of matrix surface or workpiece surface to be sprayed and pollutent and dry, then carry out sandblasting roughening treatment to the surface after decontamination.
6. the preparation method of the high-compactness cold spraying metal lithosomic body based on mixed powder according to claim 1, it is characterized in that, described cold spray process be by a high speed, mixed powder accelerates by the gas of high pressure, heating, the viscous deformation formation of deposits coating that mixed powder is produced by high-speed impact matrix surface or workpiece surface to be sprayed under solid conditions or bulk.
7. the preparation method of the high-compactness cold spraying metal lithosomic body based on mixed powder according to claim 6, it is characterized in that, in spraying process, the gas of high speed used, high pressure is helium, nitrogen or air.
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| CN110303163A (en) * | 2019-05-23 | 2019-10-08 | 中国人民解放军第五七一九工厂 | A kind of high-strength high cracking resistance laser gain material reparation composite powder and preparation method |
| CN110303163B (en) * | 2019-05-23 | 2022-03-11 | 中国人民解放军第五七一九工厂 | High-strength and high-crack-resistance composite powder for laser additive repair and preparation method thereof |
| CN111799116A (en) * | 2020-06-22 | 2020-10-20 | 陕西斯瑞新材料股份有限公司 | Preparation method of rapidly-formed copper-chromium composite contact |
| CN111799116B (en) * | 2020-06-22 | 2022-06-07 | 陕西斯瑞新材料股份有限公司 | Preparation method of rapidly-formed copper-chromium composite contact |
| CN113351871A (en) * | 2021-06-07 | 2021-09-07 | 广东省科学院新材料研究所 | Metal composite layer and preparation method thereof, and seamless cathode roller and preparation method thereof |
| CN114277367A (en) * | 2021-12-22 | 2022-04-05 | 亚洲硅业(青海)股份有限公司 | Cold spraying-based coating preparation method, cold spraying device and cold spraying coating |
| CN115229188A (en) * | 2022-06-24 | 2022-10-25 | 广东省科学院新材料研究所 | Porous metal material and manufacturing method and application thereof |
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