CN106947970A - A kind of titanium or titanium alloy surface prepares fine grain Ti3The method and apparatus of Al/TiN gradient coatings - Google Patents
A kind of titanium or titanium alloy surface prepares fine grain Ti3The method and apparatus of Al/TiN gradient coatings Download PDFInfo
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- CN106947970A CN106947970A CN201710178589.8A CN201710178589A CN106947970A CN 106947970 A CN106947970 A CN 106947970A CN 201710178589 A CN201710178589 A CN 201710178589A CN 106947970 A CN106947970 A CN 106947970A
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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
- C23C28/00—Coating for obtaining at least two superposed coatings either by methods not provided for in a single one of groups C23C2/00 - C23C26/00 or by combinations of methods provided for in subclasses C23C and C25C or C25D
- C23C28/30—Coatings combining at least one metallic layer and at least one inorganic non-metallic layer
- C23C28/36—Coatings combining at least one metallic layer and at least one inorganic non-metallic layer including layers graded in composition or physical properties
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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
- C23C24/106—Coating with metal alloys or metal elements only
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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
- C23C8/00—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
- C23C8/06—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using gases
- C23C8/08—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using gases only one element being applied
- C23C8/24—Nitriding
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Abstract
The present invention provides a kind of titanium or titanium alloy surface and prepares fine grain Ti3The method of Al/TiN gradient coatings, methods described is in a nitrogen atmosphere, while aluminium powder and ultrasonic vibration treatment are sent in the progress laser scanning processing of titanium or titanium alloy surface, synchronous original position to workpiece substrate, so as to prepare fine grain Ti on the titanium or titanium alloy surface3Al/TiN gradient coatings.The present invention also provides a kind of titanium or titanium alloy surface that is used for and prepares fine grain Ti3The device of Al/TiN gradient coatings.According to the present invention, this method have it is easy to operate, can with local heating, contactless processing, prepare the time required to short, Ti3The advantages of Al/TiN coating layer depths are controllable, prepared fine grain Ti3Al/TiN gradient coatings have the advantages that low pore-free, flawless, surface roughness, crystal grain refinement compared with prior art, hardness is high, wear and corrosion behavior is good, surface residual stress is reduced.
Description
Technical field
The present invention relates to the field of surface modification of titanium or titanium alloy, relate more specifically to a kind of titanium or titanium alloy surface and prepare
Fine grain Ti3The method and apparatus of Al/TiN gradient coatings.
Background technology
It is well known that titanium or titanium alloy has high specific strength, fatigue strength height, good corrosion resistance and good biocompatibility
The advantages of, mechanical property is good under high temperature and cryogenic conditions, and some titanium alloys also have memory, superconduction, hydrogen storage etc.
Specific function.Wherein, Ti6Al4V alloys have good combination property and excellent mechanical property, have been widely used in boat
The fields such as empty space flight, biomedicine, chemical engineering industry.But, titanium alloy itself also has weak point, and its hardness is low, wearability
Can be poor, these shortcomings seriously limit the application of titanium alloy.In actual engineer applied, the failure of material often originates from
In surface, such as fatigue, corrosion and abrasion of material etc., the influence of the surface property and state of material to material failure is very
Greatly, integrated performance index of the material in engineer applied is directly influenced.Therefore, surface Hardening Treatment is carried out to titanium alloy just to show
Obtain particularly important.
Traditional Ti3Al/TiN coatings are due to higher hardness and preferable high-temperature stability, extensive use
In the wearability and high temperature oxidation resistance that improve titanium alloy.But pass through test, traditional Ti3Al/TiN often preparation technologies
Complicated, consuming time length, cost are higher, disposable completion composite coating synthesis it is also difficult to achieve, especially because at laser
The quick heating of reason process can cause the residual stress on surface very big with fast cooling, can cause coating surface produce stomata with
Crackle.Therefore Applied Physics or the residual stress on the method for chemistry reduction surface have important Research Significance.
The traditional Ti of prior art3Al/TiN preparation methods include Direct Laser facture, surface coated alloy in air
Laser radiation method etc. after layer, still, the shortcoming of previous preparation method is that oxygen is easily doped in coating, influences coating, latter
The shortcoming of preparation method is that coating layering is serious, and bond strength is slightly poor.In addition, the coating prepared by traditional Laser Surface Treatment
Easily there are the phenomenons such as surface is cracked, surface roughness is big, matrix is yielding, nitration case coarse grains.
The content of the invention
Fine grain Ti is prepared it is an object of the invention to provide a kind of titanium or titanium alloy surface3The method of Al/TiN gradient coatings and
Device, so as to solve Ti traditional in the prior art3Al/TiN preparation technologies complexity, consuming time length, cost are higher, Yi Biao
Face is cracked, surface roughness is big, matrix is yielding and the defect of nitration case coarse grains.
In order to solve the above-mentioned technical problem, the present invention uses following technical scheme：
According to the first aspect of the invention fine grain Ti is prepared there is provided a kind of titanium or titanium alloy surface3Al/TiN gradient coatings
Method, methods described be in a nitrogen atmosphere, while the titanium or titanium alloy surface of workpiece substrate is carried out laser scanning processing,
Aluminium powder and ultrasonic vibration treatment are sent in synchronous original position, so as to prepare fine grain Ti on the titanium or titanium alloy surface3Al/TiN gradients
Coating.
The operation principle of method provided by the present invention is：The titanium or titanium alloy table of workpiece substrate is radiated using high energy laser beam
Face, melts surfacing, the dendritic crystalline of titanium elements, aluminium element and high pure nitrogen reaction generation hard in the matrix of molten state
TiN and intergranular solidfied material Ti3Al etc., while dendritic growth is interrupted to the stopping effect of TiN dendritic growths using ultrasonic vibration,
Main reduction surface stress, is then cooled down in the environment of nitrogen, you can the preferable gradient coating of generation.It is so-called that " gradient is applied
Layer ", the coating that as constituent changes with the change of depth.
Methods described is specifically included：1) workpiece substrate is fixed on to the ultrasonic vibration being contained in a seal case to put down
On platform, nitrogen is persistently filled with the seal case；And 2) to the workpiece substrate ultrasonic vibration and laser scanning are applied, together
Shi Liyong coaxial powder feeding devices are synchronous to injection aluminium powder at laser scanning and to supplying nitrogen at laser scanning, so that in the work
The titanium or titanium alloy surface of part matrix forms fine grain Ti3Al/TiN gradient coatings.
Preferably, the power of the ultrasonic vibration is 20-100W, and vibration frequency is 0-40kHz, vibrational waveform be square wave or
Sine wave oscillations；The laser power 1500-3000W of the laser scanning, sweep speed is 300-600mm/min；The nitrogen
Purity be not less than 99.99%, flow is 30-80L/min；The purity of the aluminium powder is not less than 99.99%.
Laser section rectangular dimension is preferably 1mm × 6mm so that the area of processing is bigger in the laser scanning unit interval,
More efficiently.
Methods described is additionally included in fine grain Ti3After Al/TiN gradient coatings are formed, laser is closed, several minutes is crossed and stops ultrasound
Vibration, nitrogen is passed through after several minutes of stoppings.
Methods described also includes the pretreatment on the titanium or titanium alloy surface, and the pretreatment includes：To the titanium and titanium
Alloy surface carries out being cleaned by ultrasonic cleaning and surface roughening processing.
The surface roughening processing is after ultrasonic cleaning, to be sprayed after the titanium or titanium alloy surface is polished smoothly
The processing of sand roughening.
Roughening particle used is Al in the blasted roughization processing2O3Particle.Preferably, whiff pressure is 0.2Mpa, spray
Mouth is apart from titanium or titanium alloy surface 5cm.
According to method provided by the present invention, according to the difference and the different needs of coating layer thickness of workpiece substrate thickness, fit
When the technological parameter for choosing laser, you can make prepared fine grain Ti3Al/TiN gradient coatings layer depth is controlled at 300~800 μm,
Avoid coating too thin, it is impossible to play corresponding protective effect, and coating is too thick, coat inside is easily cracked and hole
Hole, is unfavorable for the defect of coutinuity of coating.
According to the second aspect of the invention, a kind of titanium or titanium alloy surface that is used for also is provided and prepares fine grain Ti3Al/TiN ladders
The device of coating is spent, described device includes：Ultrasonic vibration platform for fixing workpiece substrate；Connect with the ultrasonic vibration platform
The supersonic generator connect；Laser generator above the ultrasonic vibration platform；Sent out by a pipeline to the laser
The exit of raw device conveys the coaxial powder feeding device of aluminium powder；And conveyed by another pipeline to the exit of the laser generator
The nitrogen cylinder of nitrogen；Wherein, the ultrasonic vibration platform and laser generator are contained in a seal case.
Nitrogen is passed through in the seal case in advance.
The outlet of the laser generator is with the surface of the workpiece substrate at a distance of 0.5cm~2cm, most preferably 1.0cm.
Advantages of the present invention and beneficial effect：Method have it is easy to operate, can with local heating, contactless processing, prepare
Required time is short, TiN/Ti3The advantages of Al coating layer depths are controllable.Between the gradient coating and matrix that are formed after laser scanning processing
There is no obvious boundary, coating structure even transition, coating is tightly combined with matrix, coating and matrix binding ability are strong.After testing,
TiN/Ti3The defects such as Al gradient coating crystal grain tiny, no stomata and crackle, coating quality is good.Understood through hardness test,
TiN/Ti3Al gradient coatings hardness improves very big, and hardness is with the change even variation of profile depth.Rubbed wear test is obtained
Go out, TiN/Ti3Al gradient coatings coefficient of friction and Wear track depth are all smaller, and its close structure, with good friction resistant
Polishing machine.Anti-wear performance is improved more than decades of times.After being measured using X-rd residual stress tests instrument, after ultrasonic vibration
Coating surface residual stress reduces many than not applying the coating of ultrasonic vibration.
In a word, the fine grain Ti according to prepared by the method that the present invention is provided3Al/TiN gradient coatings are compared with prior art
Have the following advantages that：
1) defect such as pore-free, crackle；
2) Coating Surface Roughness is low, crystal grain is tiny；
3) hardness has large increase compared with matrix；
4) coating structure and hardness with the change of profile depth even variation；
5) surface abrasion resistance is greatly improved compared with matrix, reduces the degree of skimming wear and adhesive wear；
6) corrosion resistance has large increase compared with matrix, and corrosion resistance is improved；
7) residual stress of the coating surface Jing Guo ultrasonic vibration, which does not apply the coating of ultrasonic vibration, obvious reduction.
Brief description of the drawings
Fig. 1 is the structural representation of device according to a preferred embodiment of the present invention；
Fig. 2 is the surfaces nitrided titanium gradient coating diagrammatic cross-section of titanium or titanium alloy resulting after laser scanning is handled；
Fig. 3 be laser power be 2.5kw when, ultrasonic vibration laser treatment with without after ultrasonic vibration on specimen cross section
Hardness with this apart from surface layer depth change comparison diagram；
Fig. 4 is that ultrasonic vibration Laser Alloying Treatment (left side) is not with applying ultrasonic vibration when laser power is 2.5kw
The nearly top layer light microscopic figure of specimen cross section on (right side)；
Fig. 5 is that under single track laser scanning, specimen surface residual stress is not with applying after ultrasonic vibration Laser Alloying Treatment
Plus ultrasonic vibration specimen surface residual stress test comparison diagram.
Embodiment
Below in conjunction with specific embodiment, the present invention will be further described.It should be understood that following examples are merely to illustrate this
Invention is not for limitation the scope of the present invention.
As shown in figure 1, being according to a preferred embodiment of the present invention for preparing fine grain on titanium or titanium alloy surface
Ti3The device of Al/TiN gradient coatings.The device mainly includes：Ultrasonic vibration platform 1, supersonic generator 2, laser generator
3, coaxial powder feeding device 4, coaxial powder-feeding pipeline 5, nitrogen cylinder 6, nitrogen delivery pipe road 7, seal case 8.Wherein, ultrasonic vibration platform
1 is used to fix workpiece substrate 10, and supersonic generator 2 is connected with the signal of ultrasonic vibration platform 1, provided to ultrasonic vibration platform 1
The vibration signal of certain frequency.Laser generator 3 is located at the top of ultrasonic vibration platform 1, for the surface to workpiece substrate 10
Laser scanning is provided.It can be seen from figure 1 that ultrasonic vibration platform 1 is contained in a seal case 8 with laser generator 3, seal box
Body 8 includes soft silica gel plate shell 9, and the seal case 8 is passed through high-purity in advance before experiment starts by nitrogen delivery pipe road 7
Degree nitrogen is until be full of.Coaxial powder feeding device 4 conveys aluminium powder, nitrogen by a coaxial powder feeding pipe road 5 to the exit of laser generator 3
Gas cylinder 6 by exit supplying nitrogen from a nitrogen delivery pipe road 7 to laser generator 3.
The outlet of the laser generator, at a distance of 0.5cm~2cm, most preferably, is with the surface of the workpiece substrate
1cm。
According to a preferred embodiment of the present invention, the model TS-1004 of supersonic generator 2；Laser generator 3 is
Shanghai unity Puri agate source, laser apparatus has the CP4000 type CO2 laser-processing systems of cigarette company production；Coaxial powder feeding device 4 is coaxial defeated
The aluminium powder purity sent is not less than 99.99%, granularity size be 75 μm~150 μm (100 mesh~200 mesh), ground by Beijing mining and metallurgy
Jiu Zongyuan metal materials research institute produces.
Embodiment 1
Its surface is carried out as workpiece substrate 10 there is provided the titanium alloy substrate (Ti-6Al-4V) that thickness is 6mm first
It is cleaned by ultrasonic, and carries out surface roughening processing, roughening processing uses a kind of surface desertification device, and whiff pressure is
0.2Mpa, roughening particle used is Al2O3Particle, nozzle distance sample surface 5cm.Using device as shown in Figure 1, first, by work
Part matrix 10 is fixed on ultrasonic vibration platform 1, and sealing is put into by opening soft silica gel plate shell 9 by ultrasonic vibration platform 1
In casing 8, vacuumize, after the air in casing 8 to be sealed is completely exhausted out, forms vacuum environment, then pass through nitrogen delivery pipe
Road 7 is constantly passed through high pure nitrogen, inflationtime into seal case 8>5 minutes, make to be full of nitrogen in seal case 8；Then beat
Supersonic generator 2 is driven, treats that the power of supersonic generator 2 reaches 100W, laser generator 3 is opened, while passing through nitrogen
Transfer pipeline 7 injects aluminium powder to being passed through nitrogen around laser beam using coaxial powder feeding device 4 is synchronous at laser scanning, allows sharp
Light beam 11 is at the uniform velocity inswept workpiece substrate 10, make nitrogen in high temperature environments with reacted under the conditions of ultrasonic vibration with Al, Ti, in workpiece
The surface quick in situ generation TiN/Ti of matrix 103Al composite coatings.Laser power is 1.5kw, and sweep speed is 300mm/
Min, nitrogen flow is 50L/min.After laser scanning terminates, continue ultrasonic vibration 1 minute and be passed through 5 points of high pure nitrogen
Clock, until treated workpiece substrate 10 is cooled down, then stops being filled with high pure nitrogen.
Fig. 2 is titanium or titanium alloy surface Ti resulting after laser scanning is handled3Al/TiN gradient coating diagrammatic cross-sections.
Wherein, a represents surface Ti3Al/TiN gradient coatings, b represents heat affected area, is the transition between coating and workpiece substrate 10.
When Fig. 3 represents laser power 2.5kw, ultrasonic vibration laser treatment with without (other after ultrasonic vibration laser treatment
Condition is identical with ultrasonic vibration laser treatment, be only without ultrasonic vibration) specimen cross section hardness with the point apart from surface
The change comparison diagram of layer depth.It follows that by ultrasonic vibration with without ultrasonic vibration after laser treatment specimen cross section it is hard
Degree is reduced with the increase of profile depth, and the specimen cross section hardness after ultrasonic vibration laser treatment is integrally than without super
Sample is high after acoustic vibration.
Fig. 4 be through application ultrasonic vibration after and do not apply ultrasonic vibration optical microscope photograph contrast, can from figure
To see that laser treatment is more smooth flat bright compared to the coating surface not applied prepared by ultrasonic vibration after application ultrasonic vibration, is in
Golden yellow, coating surface and internal pore-free, crackle, are metallurgical binding, even tissue, no smelting between coating and titanium alloy substrate
Golden defect is present, about 800 μm of the thickness of composite coating.
Fig. 5 is under single track laser scanning, to pass through the different positions on face coat after ultrasonic vibration Laser Alloying Treatment
Put and take respectively 5 points of gained specimen surface residual stress and do not apply ultrasonic vibration specimen surface residual stress test comparison diagram, pass through
Cross contrast to understand, the overall coating for not applying ultrasonic vibration of residual stress of the coating surface by ultrasonic vibration has significantly
Reduction.
Embodiment 2
Its surface is carried out as workpiece substrate 10 there is provided the titanium alloy substrate (Ti-6Al-4V) that thickness is 6mm first
Chemistry is cleaned by ultrasonic, and carries out surface roughening processing, and roughening processing uses a kind of surface desertification device, and whiff pressure is
0.2Mpa, roughening particle used is Al2O3Particle, nozzle distance sample surface 5cm.Using device as shown in Figure 1, by workpiece base
Body 10 is fixed on ultrasonic vibration platform 1, and ultrasonic vibration platform 1 is put into seal case 8, vacuumized, in casing 8 to be sealed
Air be completely exhausted out after, formed vacuum environment, be then constantly passed through by nitrogen delivery pipe road 7 into seal case 8 high-purity
Nitrogen, inflationtime>5 minutes, make to be full of nitrogen in seal case 8；Then supersonic generator 2 is opened, ultrasonic wave is treated
The power of device 2 reaches 100W, and laser generator 3 is opened, while being passed through nitrogen to around laser beam by nitrogen delivery pipe road 7
Gas, and aluminium powder is injected at laser scanning using coaxial powder feeding device 4 is synchronous, allows the at the uniform velocity inswept workpiece substrate 10 of laser beam 11, makes
Nitrogen in high temperature environments with reacted under the conditions of ultrasonic vibration with Al, Ti, in the surface quick in situ generation of workpiece substrate 10
TiN/Ti3Al composite coatings.Laser power is 2.5kw, and sweep speed is 400mm/min, and nitrogen flow is 50L/min.Wait to swash
After optical scanning terminates, continue ultrasonic vibration 1 minute and be passed through high pure nitrogen 5 minutes, until treated workpiece substrate 10 is cold
But, then stop being filled with high pure nitrogen.
Embodiment 3
Its surface is carried out as workpiece substrate 10 there is provided the titanium alloy substrate (Ti-6Al-4V) that thickness is 6mm first
Chemistry is cleaned by ultrasonic, and carries out surface roughening processing, and roughening processing uses a kind of surface desertification device, and whiff pressure is
0.2Mpa, roughening particle used is Al2O3Particle, nozzle distance sample surface 5cm.Using device as shown in Figure 1, by workpiece base
Body 10 is fixed on ultrasonic vibration platform 1, and ultrasonic vibration platform 1 is put into seal case 8, vacuumized, in casing 8 to be sealed
Air be completely exhausted out after, formed vacuum environment, be then constantly passed through by nitrogen delivery pipe road 7 into seal case 8 high-purity
Nitrogen, inflationtime>5 minutes, make to be full of nitrogen in seal case 8；Then supersonic generator 2 is opened, ultrasonic wave is treated
The power of device 2 reaches 100W, and laser generator 3 is opened, while being passed through nitrogen to around laser beam by nitrogen delivery pipe road 7
Gas, and aluminium powder is injected at laser scanning using coaxial powder feeding device 4 is synchronous, allows the at the uniform velocity inswept workpiece substrate 10 of laser beam 11, makes
Nitrogen in high temperature environments with reacted under the conditions of ultrasonic vibration with Al, Ti, in the surface quick in situ generation of workpiece substrate 10
TiN/Ti3Al composite coatings.Laser power is 3.0kw, and sweep speed is 500mm/min, and nitrogen flow is 50L/min.Wait to swash
After optical scanning terminates, continue ultrasonic vibration 1 minute and be passed through high pure nitrogen 5 minutes, until treated workpiece substrate 10 is cold
But, then stop being filled with high pure nitrogen.
It can be seen that from embodiment 1-3 result：Using different laser nozzle sweep speeds, microcosmic group of coat inside
Knit and the thickness of coating is changed, but between coating and matrix be metallurgical binding.Therefore, according to matrix thickness not
The need for same and coating layer thickness, appropriate laser technical parameterses of choosing can obtain the coating of different-thickness.
According to the present invention, this method have it is easy to operate, can with local heating, contactless processing, prepare the time required to it is short,
Ti3The advantages of Al/TiN coating layer depths are controllable, prepared fine grain Ti3Al/TiN gradient coatings have nothing compared with prior art
Stomata, flawless, surface roughness are low, crystal grain refinement, hardness high, wear and corrosion behavior is good, surface residual stress is reduced etc.
Advantage.
Above-described, only presently preferred embodiments of the present invention is not limited to the scope of the present invention, of the invention is upper
Stating embodiment can also make a variety of changes.What i.e. every claims and description according to the present patent application were made
Simply, equivalence changes and modification, fall within the claims of patent of the present invention.Of the invention not detailed description is
Routine techniques content.
Claims (10)
1. a kind of titanium or titanium alloy surface prepares fine grain Ti3The method of Al/TiN gradient coatings, it is characterised in that methods described is
In a nitrogen atmosphere, sent while carrying out laser scanning processing, synchronous original position to titanium or titanium alloy surface at aluminium powder and ultrasonic vibration
Reason, so as to prepare fine grain Ti on the titanium or titanium alloy surface3Al/TiN gradient coatings.
2. according to the method described in claim 1, it is characterised in that methods described is specifically included：
1) workpiece substrate is fixed on the ultrasonic vibration platform being contained in a seal case, held in the seal case
It is continuous to be filled with nitrogen；And
2) ultrasonic vibration and laser scanning are applied to the workpiece substrate in nitrogen atmosphere, while same using coaxial powder feeding device
Walk and inject aluminium powder at laser scanning and to supplying nitrogen at laser scanning, so that in the titanium or titanium alloy of the workpiece substrate
Surface forms fine grain Ti3Al/TiN gradient coatings.
3. method according to claim 2, it is characterised in that the power of the ultrasonic vibration is 20-100W, vibration frequency
For 0-40kHz, vibrational waveform is square wave or sine wave oscillations；The laser power 1500-3000W of the laser scanning, scanning speed
Spend for 300-600mm/min；The purity of the nitrogen is not less than 99.99%, and flow is 30-80L/min；The purity of the aluminium powder
Not less than 99.99%.
4. method according to claim 2, it is characterised in that methods described is additionally included in fine grain Ti3Al/TiN gradient coatings
After formation, laser is closed, several minutes of stopping ultrasonic vibrations being crossed, nitrogen is passed through after several minutes of stoppings.
5. method according to claim 2, it is characterised in that methods described is also pre- including the titanium or titanium alloy surface
Processing, the pretreatment includes：The titanium or titanium alloy surface is carried out to be cleaned by ultrasonic cleaning and surface roughening processing.
6. method according to claim 5, it is characterised in that the surface roughening processing is after ultrasonic cleaning, to incite somebody to action
Blasted rough processing is carried out after the titanium or titanium alloy surface polishing is smooth.
7. according to the method described in claim 1, it is characterised in that the fine grain Ti of the preparation3Al/TiN gradient coating thickness is
300-800μm。
8. a kind of device for being used to implement any one methods described in claim 1-7, it is characterised in that described device bag
Include：
Ultrasonic vibration platform for fixing workpiece substrate；
The supersonic generator being connected with the ultrasonic vibration bracket signal；
Laser generator above the ultrasonic vibration platform；
The coaxial powder feeding device of aluminium powder is conveyed to the exit of the laser generator by a pipeline；And
By nitrogen cylinder from another pipeline to the exit supplying nitrogen of the laser generator；
Wherein, the ultrasonic vibration platform and laser generator are contained in a seal case.
9. device according to claim 8, it is characterised in that be passed through nitrogen in advance in the seal case.
10. device according to claim 8, it is characterised in that the outlet of the laser generator and the workpiece substrate
Surface at a distance of 0.5cm~2cm.
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| CN110106484A (en) * | 2019-04-29 | 2019-08-09 | 中国航发北京航空材料研究院 | The preparation method of coating is washed away in a kind of titanium alloy surface heat resistanceheat resistant |
| CN111471954A (en) * | 2020-04-13 | 2020-07-31 | 北京科技大学 | In-situ synthesis coherent Ti on surfaces of pure titanium and titanium alloy2N film method |
| CN111962063A (en) * | 2020-07-24 | 2020-11-20 | 中国航发北京航空材料研究院 | Preparation method of high-temperature protective coating |
| CN112243464A (en) * | 2018-07-11 | 2021-01-19 | 西铁城时计株式会社 | Method for producing golden member and golden member |
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| CN111962063A (en) * | 2020-07-24 | 2020-11-20 | 中国航发北京航空材料研究院 | Preparation method of high-temperature protective coating |
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