CN108130530A - A kind of particle for ultrahigh speed laser melting coating enhances powder metal composition - Google Patents
A kind of particle for ultrahigh speed laser melting coating enhances powder metal composition Download PDFInfo
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- CN108130530A CN108130530A CN201711405739.0A CN201711405739A CN108130530A CN 108130530 A CN108130530 A CN 108130530A CN 201711405739 A CN201711405739 A CN 201711405739A CN 108130530 A CN108130530 A CN 108130530A
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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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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F1/00—Metallic powder; Treatment of metallic powder, e.g. to facilitate working or to improve properties
- B22F1/06—Metallic powder characterised by the shape of the particles
- B22F1/065—Spherical particles
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F9/00—Making metallic powder or suspensions thereof
- B22F9/02—Making metallic powder or suspensions thereof using physical processes
- B22F9/06—Making metallic powder or suspensions thereof using physical processes starting from liquid material
- B22F9/08—Making metallic powder or suspensions thereof using physical processes starting from liquid material by casting, e.g. through sieves or in water, by atomising or spraying
- B22F9/082—Making metallic powder or suspensions thereof using physical processes starting from liquid material by casting, e.g. through sieves or in water, by atomising or spraying atomising using a fluid
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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
- C22C19/07—Alloys based on nickel or cobalt based on cobalt
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C30/00—Alloys containing less than 50% by weight of each constituent
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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
- C22C32/0005—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 at least one oxide and at least one of carbides, nitrides, borides or silicides as the main non-metallic constituents
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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
- 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
- C22C32/0047—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 carbides, nitrides, borides or silicides as the main non-metallic constituents
- C22C32/0052—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 carbides, nitrides, borides or silicides as the main non-metallic constituents only carbides
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Abstract
A kind of particle for ultrahigh speed laser melting coating provided by the invention enhances Co-based alloy powder, is made of cobalt-based body metal powder with oxide or carbide particle, and proportioning is：50 98% cobalt-based body metal powder, 2 50% oxide or carbide particle；Wherein the chemical composition of cobalt-based body and its mass percent are：0.1 2.0%C, 20.0-40.0%Cr, 1.0-20.0%W, 1.0-10.0%Mo, Si≤1.5%, Fe≤3.0%, Ni≤3.0%, Mn≤1.0%, P≤0.030%, S≤0.030%, surplus are Co and inevitable impurity.The metal powder grain size is：10 100 μm, mobility：32‑41 s/100g.Using above-mentioned grain reinforced metal powder, using laser melting and coating technique, different process of arranging in pairs or groups is strengthened matrix surface and is repaired.
Description
Technical field
The invention belongs to metal material fields, and in particular to a kind of particle enhancing cobalt-based gold for ultrahigh speed laser melting coating
Belong to powder.
Background technology
Laser melting and coating technique is a kind of surface hardening process technology, refers to and is added in substrate surface by different filler modes
Selected coating material, using the laser beam of high power density be allowed to the consolidation simultaneously of substrate surface thin layer, and coagulate rapidly
After Gu formed dilution it is extremely low, with matrix into metallurgical binding face coat, so as to significantly improve the wear-resisting, resistance to of substrate surface
The process of the characteristics such as erosion, heat-resisting, anti-oxidant.Traditional laser melting and coating technique mainly acts on base material table due to laser energy
Face, powder temperature are less than fusing point, and heat scatters and disappears, and big, capacity usage ratio is low, and cladding rate is slow, and heat affected area is larger, serious to make
The about popularization and application of laser melting and coating technique.
Cobalt-base alloys is a kind of ability various types abrasion and the hard alloy of corrosion and high-temperature oxydation.It has both excellent
Different high temperature resistant, wear resistant corrosion resistant performance is the good coat material that the surface under the complicated harsh working condition of reply is modified.
Invention content
The present invention relates to particles used in a kind of superelevation rate laser cladding method and this method to enhance cobalt-base alloys
Powder.Superelevation rate laser melting coating is a kind of Surface-micromachining process, by synchronous powder feeding system adding material mode, utilizes the beam of high-energy-density
The substrate material surface that stream makes added material be moved with high-speed melts simultaneously, and quickly formation dilution rate is extremely low after solidification, with
Matrix be in metallurgical binding cladding layer, cladding rate is greatly improved, significantly improve substrate material surface it is wear-resisting, anti-corrosion, heat-resisting,
The process of the operational characteristiies such as anti-oxidant.
Compared with conventional low rate high speed cladding, superelevation rate laser melting coating high energy beam small part energy acts on matrix
Shallower molten bath is formed on material, and most of energy has been acted on dusty material, makes powder temperature before molten bath is entered
It rises to fusing point and melts, combined in droplets with basis material, so that the processing of ultrahigh speed laser melting coating is more molten than tradition
It covers efficiency and improves 40 times to hundreds of times.
Since the laser energy of superelevation rate laser melting and coating technique mainly acts on powder, the gold used in cladding process
Belong to powder has vital influence, powdered ingredients, particle size range, mobility, sphericity, enhancing particle for cladding effect
Ingredient and the parameters such as adding proportion directly affect the performance of cladding layer.Mainly use following index：(1) particle size range, metal
The size of powder particle is usually characterized with the diameter of particle；(2) mobility refers to flow through predetermined hole diameter with a certain amount of powder
Standard funnel required time represent that the unit of generally use is s/50g, the smaller flowing for illustrating the powder of numerical value
Property is better；(3) sphericity, the shape of the particle degree similar to sphere；(5) D50, the index of description powder size distribution,
The cumulative particle sizes percentile for referring to a sample reaches grain size corresponding when 50%.
Due to traditional cobalt-based metal material can not effectively pool smaller spot etc., the particle size powders are through cladding head
After conveying convergence, amyloid plaque is relatively large in diameter, and can not meet the technological requirement of the small amyloid plaque of superelevation rate laser melting coating.Need what is illustrated
It is that the ultrahigh speed in the present invention is for existing laser melting coating speed, which specifically refers to laser scanning
Linear velocity is more than or equal to 25m/min.
According to an aspect of the present invention, the present invention provides a kind of particles for ultrahigh speed laser melting coating to enhance cobalt-based metal
Powder, it is characterised in that be made of cobalt-based body metal powder with oxide or carbide particle, proportioning is：The cobalt-based of 50-98%
Body metal powder, the oxide or carbide particle of 2-50%, the oxide or carbide particle are selected from Al2O3、ZrO2、WC、TiC
One or more of；Wherein the chemical composition of cobalt-based body metal powder and its mass percent are：0.1-2.0%C, 20.0-
40.0%Cr, 1.0-20.0%W, 1.0-10.0%Mo, Si≤1.5%, Fe≤3.0%, Ni≤3.0%, Mn≤1.0%, P≤
0.030%, S≤0.030%, surplus are Co and inevitable impurity；
Wherein, sphericity >=90% of the powder, mobility are 32-41 s/100g.
According to a further aspect of the invention, C 0.1-1.5%.
According to a further aspect of the invention, Cr 25-35%.
According to a further aspect of the invention, size distribution is：10-100μm.
According to a further aspect of the invention, the D50 of powder is 25-50 μm.
According to a further aspect of the invention, Han Yang Liang≤150ppm.
According to a further aspect of the invention, the preparation method of above-mentioned powder is provided, which is characterized in that this method is：Former material
Expect composition alloyization proportioning, then carry out vacuum melting cobalt ingot, melt cobalt ingot, working chamber's vacuum degree using Frequency Induction Heating
10-1-10-2Pa, using aerosolization method powder, dust gases argon pressure 1.2-3.8MPa, receives to carry out granularity sieve after powder
Point, the metal powder of 10-100 μm of particle size range of screening；The oxide or carbide that particle size range is 10-100 μm are chosen, it will
The metal powder that the particle size range prepared is 10-100 μm is matched as corresponding in batch mixer to oxide or carbide particle
Uniformly mixing, you can be made enhances powder metal composition for the particle of ultrahigh speed laser melting coating.
According to a further aspect of the invention, the present invention provides a kind of particle enhancing cobalt-based gold for ultrahigh speed laser melting coating
Belong to powder, be made of cobalt-based body metal powder with oxide or carbide particle, proportioning is：The cobalt-based body metal powder of 50-98%
End, one of Al2O3, ZrO2 or WC of 2-50%, TiC or two kinds or more of combined hybrid powder；The wherein chemistry of cobalt-based body
Ingredient and its mass percent are：0.1-2.0%C, 20.0-40.0%Cr, 1.0-20.0%W, 1.0-10.0%Mo, Si≤
1.5%, Fe≤3.0%, Ni≤3.0%, Mn≤1.0%, P≤0.030%, S≤0.030%, surplus are Co and inevitable impurity.
According to a further aspect of the invention, wherein：The preferred 25-35% of C preferred 0.1-1.5%, Cr.
According to a further aspect of the invention, which is：10-100 μm, mobility：32-41 s/100g.
According to a further aspect of the invention, the above-mentioned particle enhancing powder metal composition for ultrahigh speed laser melting coating is prepared
Step is：
(1) prepared by cobalt matrix powder
By cobalt raw matrix materials, proportionately division aurification matches, and then carries out vacuum melting cobalt ingot, is melted using Frequency Induction Heating
Cobalt ingot, working chamber's vacuum degree 10-1-10-2Pa, using aerosolization method powder, dust gases argon pressure 1.2-3.8MPa, receives
Sizing is carried out after obtaining powder, screens the metal powder of 10-100 μm of particle size range.
Wherein, the control of vacuum degree has significant impact for indexs such as powder oxygen content, the pressure control for the gases argon that dusts
System be control powder size, sphericity and powder formation rate core parameter, need according to liquid stream situation and each to dust period comprehensively
Make accurate adjustment.
(2) addition enhancing particle
Al2O3, ZrO2 or WC that particle size range is 5-150 μm, TiC particles are chosen, is 10-100 μ by the particle size range prepared
One of metal powder and Al2O3, ZrO2 or WC, TiC of m or two kinds or more of combination, by corresponding proportioning in batch mixer
Uniformly mixing, you can ultrahigh speed laser melting coating is made enhances powder metal composition with particle.
According to a further aspect of the invention, using above-mentioned grain reinforced metal powder, using laser melting and coating technique, collocation is different
Technique is strengthened matrix surface and is repaired, the specific steps are：
(1) matrix surface is machined out；
(2) matrix surface is wiped with acetone, removes surface grease；
(3) laser melting coating path planning is carried out according to matrix surface geometry, formulates technological parameter；
(4) cladding reparation is carried out to matrix surface using semiconductor laser cladding system, using above-mentioned technological parameter：Laser power
1 ~ 2kw, spot diameter 1mm, 5 ~ 8kg/h of powder feeding rate, laser scan rate 20m ~ 500m/min, overlapping rate 30% ~ 40%, individual layer
25 ~ 500 μm of cladding thickness, laser melting coating head have argon gas defencive function, 15 ~ 30L/min of argon flow amount.
(5) matrix surface after reparation is machined out using five-axle number control machine tool, size needed for acquisition.
Compared with prior art, the advantage of the invention is that：
1. the metal powder is arranged in pairs or groups with preferred alloy content, it is capable of being combined with matrix for fine and close consolidation, significantly promotes base
Body surface abrasion resistance and service life, good economy performance.
2. laser melting coating surface processing speed can be greatly improved in ultrahigh speed laser melting and coating technique, obtain surfacing it is smooth,
The cladding layer of pore-free, flawless, the technology have the indexs such as metal powder granularity, mobility a particular/special requirement, involved by the present invention
And superelevation rate laser melting coating with particle enhance powder metal composition be suitable for the processing technology.
Specific embodiment
With reference to embodiment, the invention will be further described, but is not limited to the following example.Target in embodiment
The mass fraction of each element is as shown in table 1 in product, and performance parameter is as shown in table 2, and Application Example carries out superelevation rate laser
Cladding processing rear surface performance is as shown in table 3.
1 ultrahigh speed laser melting coating of table enhances powder metal composition ingredient with particle（Mass fraction, %）
| Embodiment | C | Si | Mn | P、S | Cr | Mo | W | Ni | Particle/content | Co |
| Embodiment 1 | 0.2 | 0.1 | 0.1 | ≤0.03 | 27 | 6 | - | 2.0 | WC-15 | Bal. |
| Embodiment 2 | 1.2 | 1.0 | 1.0 | ≤0.03 | 31 | 1.0 | 12 | 3.0 | Al2O3-5, ZrO2-5 | Bal. |
| Embodiment 3 | 1.2 | 1.5 | 1.0 | ≤0.03 | 29 | 1.5 | 4.5 | 3.0 | WC-5, TiC-10 | Bal. |
2 ultrahigh speed laser melting coating of table enhances powder metal composition performance parameter with particle（Mass fraction, %）
| Embodiment | Granularity μm | Mobility s/50g | Sphericity % | D50/μm |
| Embodiment 1 | 10-100 | 16 | 91 | 44 |
| Embodiment 2 | 10-100 | 16 | 94 | 43 |
| Embodiment 3 | 10-100 | 17 | 93 | 41 |
Matrix surface performance after 3 ultrahigh speed laser melting coating of table is repaired
| Embodiment | Hardness HRC | Wearability improves percentage % | Service life extends percentage % |
| Embodiment 1 | 56 | 142 | 220 |
| Embodiment 2 | 52 | 138 | 170 |
| Embodiment 3 | 57 | 144 | 190 |
Embodiment 1
Preferably, the present invention provides a kind of particles for ultrahigh speed laser melting coating to enhance powder metal composition, and feature exists
In being made of cobalt-based body metal powder with oxide or carbide particle, proportioning is：The cobalt-based body metal powder of 50-98%, 2-
50% oxide or carbide particle, the oxide or carbide particle are selected from Al2O3、ZrO2, one or more in WC, TiC
It is a；Wherein the chemical composition of cobalt-based body metal powder and its mass percent are：0.1-2.0%C, 20.0-40.0%Cr, 1.0-
20.0%W, 1.0-10.0%Mo, Si≤1.5%, Fe≤3.0%, Ni≤3.0%, Mn≤1.0%, P≤0.030%, S≤0.030%,
Surplus is Co and inevitable impurity；
Wherein, sphericity >=90% of the powder, mobility are 32-41 s/100g.
Preferably, C 0.1-1.5%.
Preferably, Cr25-35%.
Preferably, size distribution is：10-100μm.
Preferably, the D50 of powder is 25-50 μm.
Preferably, Han Yang Liang≤150ppm.
Preferably, the preparation method of above-mentioned powder is provided, which is characterized in that this method is：Composition of raw material alloying
Proportioning then carries out vacuum melting cobalt ingot, melts cobalt ingot, working chamber's vacuum degree 10 using Frequency Induction Heating-1-10-2Pa is adopted
With aerosolization method powder, dust gases argon pressure 1.2-3.8MPa, receives to carry out sizing after powder, screens 10-100
The metal powder of μm particle size range；Choose the oxide or carbide that particle size range is 10-100 μm, the granularity that will be prepared
Ranging from 10-100 μm of metal powder is uniformly mixed to oxide or carbide particle by corresponding proportioning in batch mixer, you can
Ultrahigh speed laser melting coating is made enhances powder metal composition with particle.
Preferably, a kind of cobalt-based body metal powder is additionally provided, the mass fraction of each element is：0.2%C, 0.1%Si,
0.1%Mn, 27%Cr, 6%Mo, 2%Ni, P≤0.030%, S≤0.030%, 15%WC particle, surplus for cobalt and inevitably it is miscellaneous
Matter.
The metal powder grain size is：10-100 μm, mobility：16s/50g, sphericity >=91%, D50=44μm。
Preferably, powder size section is 15 ~ 45 μm.Han Yang Liang≤150ppm.Hollow powder rate ＜ 1%.
Preferably, preparation method is：Composition of raw material alloying matches, and vacuum melting cobalt ingot is then carried out, using intermediate frequency
Sensing heating melts cobalt ingot, working chamber's vacuum degree 10-1-10-2Pa, using aerosolization method powder, gases argon pressure of dusting
1.2-3.8MPa receives to carry out sizing after powder.
Using the powder after screening, using ultrahigh speed laser melting and coating technique, different process of arranging in pairs or groups repaiies matrix surface
It is multiple.
Preferably, restorative procedure is：Matrix surface is machined.
With acetone wiping mold surface to be repaired, surface grease is removed.
Ultrahigh speed laser melting coating path planning is carried out according to matrix surface geometry, formulates technological parameter.
Cladding reparation is carried out to matrix surface with semiconductor laser cladding system, using above-mentioned technological parameter：Laser power 1
~ 2kw, spot diameter 1mm, 5 ~ 8kg/h of powder feeding rate, laser scan rate 20m ~ 500m/min, overlapping rate 30% ~ 40%, individual layer
25 ~ 500 μm of cladding thickness, laser melting coating head have argon gas defencive function, 15 ~ 30L/min of argon flow amount.
The matrix surface after reparation is machined out using five-axle number control machine tool, size needed for acquisition and good surface
Performance.
The mass fraction of each element is as shown in embodiment 1 in table 1 in target product.The performance parameter of embodiment 1 such as 2 institute of table
Show.It is as shown in table 3 that Application Example 1 carries out matrix ultrahigh speed laser melting coating reparation rear surface performance.
Embodiment 2
The mass fraction of its each element is：1.2%C, 1.0%Si, 1.0%Mn, 31%Cr, 1.0%Mo, 12%W, 3%Ni, P, S≤
0.030%, 5%Al2O3 particles, 5%ZrO2, surplus is cobalt and inevitable impurity.
The metal powder grain size is：10-100 μm, mobility：16s/50g, sphericity >=94%, D50=43μm。
Preparation method is：Composition of raw material alloying matches, and vacuum melting cobalt ingot is then carried out, using Frequency Induction Heating
Melt cobalt ingot, working chamber's vacuum degree 10-1-10-2Pa, using aerosolization method powder, gases argon pressure of dusting 1.2-
3.8MPa receives to carry out sizing after powder.
Using the powder after screening, using ultrahigh speed laser melting and coating technique, different process of arranging in pairs or groups repaiies matrix surface
It is multiple.
Matrix surface is machined.
With acetone wiping mold surface to be repaired, surface grease is removed.
Ultrahigh speed laser melting coating path planning is carried out according to matrix surface geometry, formulates technological parameter.
Cladding reparation is carried out to matrix surface with semiconductor laser cladding system, using above-mentioned technological parameter：Laser power 1
~ 2kw, spot diameter 1mm, 5 ~ 8kg/h of powder feeding rate, laser scan rate 20m ~ 500m/min, overlapping rate 30% ~ 40%, individual layer
25 ~ 500 μm of cladding thickness, laser melting coating head have argon gas defencive function, 15 ~ 30L/min of argon flow amount.
The matrix surface after reparation is machined out using five-axle number control machine tool, size needed for acquisition and good surface
Performance.
The mass fraction of each element is as shown in embodiment 2 in table 1 in target product.The performance parameter of embodiment 2 such as 2 institute of table
Show.It is as shown in table 3 that Application Example 2 carries out matrix ultrahigh speed laser melting coating reparation rear surface performance.
Embodiment 3
The mass fraction of its each element is：1.2%C, 1.5%Si, 1.0%Mn, 29%Cr, 1.5%Mo, 4.5%W, 3.0%Ni, P, S≤
0.030%, 5%WC particle, 10%TiC particles, surplus are cobalt and inevitable impurity.
The metal powder grain size is：10-100 μm, mobility：17 s/50g, sphericity >=93%, D50=41μm。
Preparation method is：Composition of raw material alloying matches, and vacuum melting cobalt ingot is then carried out, using Frequency Induction Heating
Melt cobalt ingot, working chamber's vacuum degree 10-1-10-2Pa, using aerosolization method powder, gases argon pressure of dusting 1.2-
3.8MPa receives to carry out sizing after powder.
Using the powder after screening, using ultrahigh speed laser melting and coating technique, different process of arranging in pairs or groups repaiies matrix surface
It is multiple.
Matrix surface is machined.
With acetone wiping mold surface to be repaired, surface grease is removed.
Ultrahigh speed laser melting coating path planning is carried out according to matrix surface geometry, formulates technological parameter.
Cladding reparation is carried out to matrix surface with semiconductor laser cladding system, using above-mentioned technological parameter：Laser power 1
~ 2kw, spot diameter 1mm, 5 ~ 8kg/h of powder feeding rate, laser scan rate 20m ~ 500m/min, overlapping rate 30% ~ 40%, individual layer
25 ~ 500 μm of cladding thickness, laser melting coating head have argon gas defencive function, 15 ~ 30L/min of argon flow amount.
The matrix surface after reparation is machined out using five-axle number control machine tool, size needed for acquisition and good surface
Performance.
The mass fraction of each element is as shown in embodiment 3 in table 1 in target product.The performance parameter of embodiment 3 such as 2 institute of table
Show.It is as shown in table 3 that Application Example 3 carries out matrix ultrahigh speed laser melting coating reparation rear surface performance.
Compared with traditional laser melting and coating technique, ultrahigh speed laser melting and coating process has dramatically different, high energy in principle
Beam small part energy, which is acted on basis material, forms shallower molten bath, and most of energy has been acted on dusty material, is made
Powder temperature before molten bath is entered rises to fusing point and melts, and instills molten bath in droplets and is combined with basis material, then according to
By matrix itself cooled and solidified.Based on this principle, ultrahigh speed laser melting coating substantially reduces powder fusing time, so as to make to melt
It covers efficiency to significantly improve, generally can reach 10 times of conventional laser cladding or more.Correspondingly, particle enhancing powder metal composition gathers
Focal length matrix surface can reach 0.2 ~ 2mm, and for the powder after cladding head conveying convergence, amyloid plaque size is smaller, such as can
To reach 0.5 ~ 1mm of Φ, it can adapt to and realize that laser scanning linear velocity is more than or equal to 25m/min.
Claims (7)
1. a kind of particle for ultrahigh speed laser melting coating enhances powder metal composition, it is characterised in that by cobalt-based body metal powder
End is formed with oxide or carbide particle, and proportioning is：The cobalt-based body metal powder of 50-98%, the oxide or carbon of 2-50%
Compound particle, the oxide or carbide particle are selected from Al2O3、ZrO2, one or more of WC, TiC；Wherein cobalt-based body gold
Belong to powder chemical composition and its mass percent be：0.1-2.0%C, 20.0-40.0%Cr, 1.0-20.0%W, 1.0-
10.0%Mo, Si≤1.5%, Fe≤3.0%, Ni≤3.0%, Mn≤1.0%, P≤0.030%, S≤0.030%, surplus is for Co and not
Evitable impurity；
Wherein, sphericity >=90% of the powder, mobility are 32-41 s/100g.
2. particle according to claim 1 enhances powder metal composition, it is characterised in that：C 0.1-1.5%.
3. particle according to claim 1 enhances powder metal composition, it is characterised in that：Cr 25-35%.
4. powder metal composition is enhanced according to claim 1-3 any one of them particle, it is characterised in that：Size distribution is：
10-100μm。
5. powder metal composition is enhanced according to claim 1-3 any one of them particle, it is characterised in that：The D50 of powder is
25-50μm。
6. particle according to claim 1 enhances powder metal composition, it is characterised in that：32-41 s/100g Han Yang Liang≤
150ppm。
7. the preparation method of the metal powder as described in claim 1-6, which is characterized in that this method is：Composition of raw material closes
Aurification matches, and then carries out vacuum melting cobalt ingot, melts cobalt ingot, working chamber's vacuum degree 10 using Frequency Induction Heating-1-10- 2Pa, using aerosolization method powder, dust gases argon pressure 1.2-3.8MPa, receives to carry out sizing after powder, screen
The metal powder of 10-100 μm of particle size range；The oxide or carbide that particle size range is 10-100 μm are chosen, will be prepared
Particle size range be 10-100 μm metal powder and oxide or carbide particle uniformly mixed in batch mixer by corresponding match
It closes, you can ultrahigh speed laser melting coating is made enhances powder metal composition with particle.
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| CN110129789A (en) * | 2019-06-19 | 2019-08-16 | 燕山大学 | A kind of tempilstick and its preparation method and application |
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| CN110424009A (en) * | 2019-08-28 | 2019-11-08 | 燕山大学 | A method of strengthening PTA ball seat using laser cladding |
| CN110424004A (en) * | 2019-08-02 | 2019-11-08 | 燕山大学 | A kind of liner repair materials of steam powder machine and the restorative procedure of steam powder machine |
| CN111020299A (en) * | 2019-12-12 | 2020-04-17 | 西安航天新宇机电装备有限公司 | Co-Al-W-TiO2Alloy bar and preparation method thereof |
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| CN110184500A (en) * | 2019-07-03 | 2019-08-30 | 辽宁思达思克控股有限公司 | Converter upper support plate and backing ring faying face laser remanufacturing powder and method |
| CN110424004A (en) * | 2019-08-02 | 2019-11-08 | 燕山大学 | A kind of liner repair materials of steam powder machine and the restorative procedure of steam powder machine |
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| CN112323063A (en) * | 2020-12-04 | 2021-02-05 | 南京铖联激光科技有限公司 | Cobalt-based high-temperature wear-resistant corrosion-resistant composite coating and preparation method thereof |
| CN115011845A (en) * | 2021-03-03 | 2022-09-06 | 通用电气公司 | Anti-fretting coating composition and coated part |
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