CN106048606A - TiC/cobalt-based alloy composite coating on surface of nodular cast iron, and laser-cladding preparation process and application thereof - Google Patents
TiC/cobalt-based alloy composite coating on surface of nodular cast iron, and laser-cladding preparation process and application thereof Download PDFInfo
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- CN106048606A CN106048606A CN201610663798.7A CN201610663798A CN106048606A CN 106048606 A CN106048606 A CN 106048606A CN 201610663798 A CN201610663798 A CN 201610663798A CN 106048606 A CN106048606 A CN 106048606A
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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
Abstract
The invention discloses a TiC/cobalt-based alloy composite coating on the surface of nodular cast iron, and a laser-cladding preparation process and application thereof, belonging to the technical field of laser cladding technology and coating preparation. According to the invention, TiC/cobalt-based alloy composite powder is used as a laser-cladding material, and the TiC/cobalt-based alloy composite coating is preapared on surface of nodular cast iron by using laser cladding technology. TiC accounts for 0 to 30% of the volume of the composite coating material; and the maximum hardness of the coating is 1200 to 1300 HV0.2, more than five times of the hardness of a nodular cast iron matrix. The composite coating is applied to nodular cast iron parts used under severe wearing conditions.
Description
Technical field
The present invention relates to laser melting and coating technique and coat preparing technology field, be specifically related to a kind of spheroidal graphite cast-iron surface TiC/
Cobalt-base alloys composite coating and laser melting coating preparation technology thereof and application.
Background technology
Spheroidal graphite cast-iron has an excellent comprehensive mechanical performance, but in use, generally because causing through frayed grade
Lost efficacy, once used the technique such as nitriding, impewdance matching that it is carried out surface Hardening Treatment, but exist long processing period, hardened layer thin,
The shortcoming such as hardened layer hardness is not high enough and quenching distortion is big, using effect is undesirable.
Laser melting and coating technique refers in a different manner by preset coating material on cladding matrix surface, through laser irradiation
It is allowed to melt with matrix surface a thin layer simultaneously, and it is extremely low and be the table of metallurgical binding with matrix to form dilution rate after rapid solidification
Face cladding layer, thus a kind of surface significantly improving wear-resisting, anti-corrosion, heat-resisting, antioxidation and the electrical characteristic etc. of matrix surface is strong
Change method.Laser melting and coating technique has the following advantages compared with other surface strengthening technologies (thermal spraying, technique for overlaying etc.): cooling speed
Degree fast (up to 105～106K/S), produce rapid solidification structure feature, be readily obtained fine grained texture or produce equilibrium state cannoted
The cenotype obtained；Heat input is little, it is little to distort, cladding layer dilution rate is little (generally less than 5%), is firm metallurgical binding with matrix
Or interface diffusion bond.Therefore, according to surface property requirement, how by alloy powder development and laser technical parameters etc. are entered
Row sum-equal matrix, it is thus achieved that cladding layer of good performance so that it is key components and parts realizes surface peening and repair, has wide
Application prospect.
Summary of the invention
It is an object of the invention to provide a kind of spheroidal graphite cast-iron surface TiC/ cobalt-base alloys composite coating and laser melting coating thereof
Preparation technology and application, prepared coating significantly improves that part is wear-resisting and Wear vesistance, is particularly well-suited at strong wear bar
The wear part used under part.
For achieving the above object, the technical solution adopted in the present invention is as follows:
The laser melting coating preparation technology of a kind of spheroidal graphite cast-iron surface TiC/ cobalt-base alloys composite coating, this technique is with TiC/
Cobalt-base alloys composite powder is laser cladding of material, uses laser melting and coating technique to prepare TiC/ cobalt-base alloys on spheroidal graphite cast-iron surface
Composite coating.
Described TiC/ cobalt-base alloys composite powder be uniformly mixed by TiC powder and Co-based alloy powder after formed, wherein:
Volume ratio shared by described TiC powder is (0-30) %, is preferably as (10-30) %..Described cobalt-base alloys is preferably Si Taili
(Stellite) alloy, described Co-based alloy powder granularity is 150～320 mesh, and described TiC powder granularity is 5～50 μm.
The preparation process of described TiC/ cobalt-base alloys composite powder is: by TiC powder and Co-based alloy powder by required ratio
Example carries out proportioning, and uniformly mixes with grinder, and incorporation time is 20min-1h；Then by the powder that mixes at baking oven
In carry out drying and processing, drying temperature is 150～200 DEG C, and drying time is 2-5h, i.e. obtains described TiC/ cobalt-base alloys and is combined
Powder.
Described laser melting and coating technique detailed process is as follows:
Before laser melting coating, the spheroidal graphite cast-iron surface of coating to be prepared is cleared up, remove the rust stain on surface, then with third
Ketone is cleaned, in case laser melting coating is used；During laser melting coating, use 6kW CO2Laser instrument, automatic powder feeding system uses fore-put powder method, swashs
Light melting and coating process parameter is: laser power P is 3.2～3.5kW, and scan velocity V is 400～600mm/min, spot diameter 2mm,
Overlapping rate 1.5, uses the side-blown protection of argon, three passage claddings；Laser cladding process use resistance heating manner spheroidal graphite is cast
Ferrum carries out auxiliary heating, and heating-up temperature is 200-350 DEG C.
The present invention uses in TiC/ cobalt-base alloys composite coating prepared by above-mentioned technique, and TiC is uniformly distributed in cobalt-base alloys
In rapid solidification structure, the TiC again separated out during the TiC solidification dissolved when the TiC part in coating is rapid melting is dendritic
Thing, another part is undissolved TiC granule, and composite coating thickness is 1-5mm.
Described composite coating (cladding layer) maximum hardness is 1200-1300HV0.2, composite coating hardness is nodular cast iron-based
Body hardness (200-240HV0.2) more than 5 times.
The present invention has the beneficial effect that:
1, the present invention proposes that TiC is combined cobalt-base alloys and is used for spheroidal graphite cast-iron surface laser cladding, develops and is applicable to ball
The novel TiC/ cobalt-base alloys composite of ink Cast Iron Surface laser cladding coating, coordinates suitable laser melting and coating process, obtains
Dense structure, flawless, the laser cladding coating that anti-wear performance is excellent.
2, the present invention uses laser melting and coating technique to be combined in spheroidal graphite cast-iron surface laser cladding TiC/ cobalt-base alloys high rigidity
Coating, thus strengthen the surface abrasion resistance of spheroidal graphite cast-iron part, make part reduce under the conditions of strong wear and send out because of friction
Raw wear out failure.
3, present invention laser melting coating TiC/ cobalt-base alloys composite coating on spheroidal graphite cast-iron, makes the wear-resisting of spheroidal graphite cast-iron surface
Performance significantly improves, and makes coating have preferable Wear vesistance.
4, the present invention applies in terms of spheroidal graphite cast-iron elevator traction sheave surface abrasion resistance lifting.
Accompanying drawing explanation
Fig. 1 is containing the cladding layer that TiC is 5% and binder course macrograph；Wherein: (a) cladding layer；(b) binder course.
Fig. 2 is containing the cladding layer that TiC is 10% and binder course macrograph；Wherein: (a) cladding layer；(b) binder course.
Fig. 3 is containing the cladding layer that TiC is 30% and binder course macrograph；Wherein: (a) cladding layer；(b) binder course.
Fig. 4 is cladding layer SEM photograph and EDS collection of illustrative plates；Wherein: (a) is SEM photograph；B () is " spectrogram 11 " place pair in (a)
The EDS collection of illustrative plates answered；C () is the figure EDS spectrum that in (a), " spectrogram 12 " place is corresponding.
Fig. 5 is the XRD figure of spheroidal graphite cast-iron surface of the present invention TiC/Co base alloy cladding layer.
Fig. 6 is laser cladding layer hardness profile.
Detailed description of the invention
Below in conjunction with drawings and Examples in detail the present invention is described in detail.
Embodiment 1
Experiment material: matrix material is spheroidal graphite cast-iron, laser cladding of material is TiC/ cobalt-base alloys composite powder, and cobalt-based closes
Gold is cobalt-chromium-tungsten alloy (CoCrW), and Co-based alloy powder granularity is 150～320 mesh, and TiC powder granularity is 5～50 μm.
The preparation process of described TiC/ cobalt-base alloys composite powder is: TiC powder and cobalt-base alloys (CoCrW) powder are pressed
Required ratio mixing, and uniformly mix with grinder, incorporation time is 30min；The powder mixed is carried out in an oven
Drying and processing, drying temperature is 180 DEG C, and drying time is 3h, i.e. obtains described TiC/ cobalt-base alloys composite powder；This composite powder
In end, volume ratio shared by TiC powder is respectively 5%, 10% and 30%.
The present embodiment laser melting and coating technique detailed process is as follows:
Before laser melting coating, spheroidal graphite cast-iron surface is cleared up, remove the rust stain on surface, then clean with acetone, in case
Laser melting coating is used；When spheroidal graphite cast-iron is carried out surface laser cladding, use 6kW CO2Laser instrument, automatic powder feeding system uses preset powder
End method.Use laser power P=3.2～3.5kW, scan velocity V=400～600mm/min, spot diameter 2mm, overlapping rate
1.5, use the side-blown protection of argon, three passage claddings, cladding layer thickness is 3mm.Resistance is used to add during laser melting coating
Hot mode carries out auxiliary heating, heating-up temperature 270-290 DEG C to sample.
After laser melting coating terminates, use line cutting by preparation sample along vertical coating surface direction cut sample,
Carry out sanding and polishing and corrosion, then carry out structure observation and analysis with metallurgical microscope, SEM etc..
The tissue signature of spheroidal graphite cast-iron surface laser cladding layer prepared by the present embodiment as Figure 1-3, after laser melting coating
Clad layer surface shapes good, by microstructure picture it can be seen that surface does not has pore and crackle, defines in cladding layer
Substantial amounts of dendrite, is evenly distributed the most tiny black particle shape material, cladding material and matrix at dendrite intergranular
Between there occurs Elements Diffusion, combine closely each other.
By sem observation cladding sample, use EDS genesis XM-2 energy disperse spectroscopy to dendrite intergranular
Black particle shape material carry out elementary analysis.Laser cladding layer tissue's SEM photograph as shown in Figure 4, EDS component analysis such as table 1-
Shown in 2.As seen from Figure 4, the black dull form and aspect being uniformly distributed on dendrite intergranular and dendrite are for containing Ti material, tying according to EDS
Really deducibility is TiC granule mutually and dissolves the dendritic TiC that TiC is formed when solidification.
The EDS component analysis of table 1 Fig. 4 (b) collection of illustrative plates 11
| Element | Line type | Apparent concentration | K ratio | Wt% | Wt%Sigma | Standard sample label | Manufacturer's standard |
| C | K linear system | 1.71 | 0.01709 | 4.10 | 0.83 | C Vit | It is |
| N | K linear system | 16.90 | 0.03009 | 6.48 | 0.77 | BN | It is |
| Si | K linear system | 0.00 | 0.00000 | 0.00 | 0.00 | SiO2 | It is |
| Ti | K linear system | 40.93 | 0.40928 | 70.83 | 1.11 | Ti | It is |
| Cr | K linear system | 2.56 | 0.02558 | 4.68 | 0.39 | Cr | It is |
| Fe | K linear system | 0.82 | 0.00817 | 1.47 | 0.40 | Fe | It is |
| Co | K linear system | 1.59 | 0.01586 | 2.89 | 0.49 | Co | It is |
| W | M linear system | 4.43 | 0.04432 | 9.56 | 0.57 | W | It is |
| Total amount: | 100.00 |
The EDS component analysis of table 2 Fig. 4 (c) collection of illustrative plates 12
| Element | Line type | Apparent concentration | K ratio | Wt% | Wt%Sigma | Standard sample label | Manufacturer's standard |
| C | K linear system | 1.80 | 0.01797 | 4.15 | 0.79 | C Vit | It is |
| N | K linear system | 16.91 | 0.03010 | 6.25 | 0.80 | BN | It is |
| Si | K linear system | 0.29 | 0.00227 | 0.39 | 0.20 | SiO2 | It is |
| Ti | K linear system | 38.32 | 0.38320 | 62.84 | 1.46 | Ti | It is |
| Cr | K linear system | 2.62 | 0.02618 | 4.51 | 0.38 | Cr | It is |
| Fe | K linear system | 1.91 | 0.01915 | 3.26 | 0.41 | Fe | It is |
| Co | K linear system | 2.18 | 0.02177 | 3.75 | 0.51 | Co | It is |
| Ba | L linear system | 3.12 | 0.02922 | 5.65 | 1.56 | BaF2 | It is |
| W | M linear system | 4.44 | 0.04438 | 9.19 | 0.59 | W | It is |
| Total amount: | 100.00 |
The XRD analysis of spheroidal graphite cast-iron surface TiC/Co base Alloy by Laser cladding layer prepared by the present embodiment is as it is shown in figure 5, lead to
Crossing cladding layer X-ray diffraction analysis to show, cladding layer is mainly by γ-Co, TiC, NiTi, CoCx and a small amount of Cr7C3, the group such as SiC
Become.Co at high temperature exists with the γ-Co form of face-centred cubic structure (more than 417 DEG C), the most then with close-packed hexagonal
ε-Co the form of structure exists, but owing to the rate of cooling of laser melting coating is exceedingly fast, makes the γ-Co of solidification and crystallization have little time phase
Become and remained into room temperature；During laser melting coating, owing to TiC granule dissolves, it is decomposed into Ti and C element is dissolved in alloy and melts
In body, Ti is in addition to forming TiC dendrite with the C solidification of dissolving in alloy melt, also with the shape when solidification of the Ni in cobalt-base alloys
TiNi is become to be present in TiC/Co base alloy cladding layer, and the element formation CoCx such as C and Co, Cr, Si in cobalt-base alloys,
Cr7C3, the carbide such as SiC.
The hardness of the spheroidal graphite cast-iron surface laser cladding layer preparing the present embodiment is tested, test result such as table 3 He
Shown in Fig. 5.
Table 3 laser cladding layer hardness data (cobalt-base alloys+30vol%TiC cladding layer transverse section hardness data)
Be can be seen that by hardness test result, along with increasing, in heat affected area and combination with spheroidal graphite cast-iron matrix surface distance
District's hardness quickly improves, and increases slowly at cladding layer zone hardness, until cladding layer surface hardness has again quickly raising, cladding
Layer maximum hardness is 1278.8HV0.2, bring up to spheroidal graphite cast-iron matrix hardness (200-240HV0.2) more than 5 times.
Described above to the disclosed embodiments, makes professional and technical personnel in the field be capable of or uses the present invention.
Multiple amendment to these embodiments will be apparent from for those skilled in the art.Therefore, the present invention will
Will not be intended to be limited to the embodiments shown herein, and be to fit to consistent with principles disclosed herein and features of novelty
The widest scope.
Claims (10)
1. the laser melting coating preparation technology of a spheroidal graphite cast-iron surface TiC/ cobalt-base alloys composite coating, it is characterised in that: this work
Skill is with TiC/ cobalt-base alloys composite powder as laser cladding of material, uses laser melting and coating technique to prepare on spheroidal graphite cast-iron surface
TiC/ cobalt-base alloys composite coating.
The laser melting coating preparation technology of spheroidal graphite cast-iron surface the most according to claim 1 TiC/ cobalt-base alloys composite coating,
It is characterized in that: described TiC/ cobalt-base alloys composite powder be uniformly mixed by TiC powder and Co-based alloy powder after formed, its
In: volume ratio shared by described TiC powder is (0 30) %.
The laser melting coating preparation technology of spheroidal graphite cast-iron surface the most according to claim 2 TiC/ cobalt-base alloys composite coating,
It is characterized in that: in described TiC/ cobalt-base alloys composite powder, volume ratio shared by TiC powder is (10 30) %.
The laser melting coating preparation technology of spheroidal graphite cast-iron surface the most according to claim 2 TiC/ cobalt-base alloys composite coating,
It is characterized in that: described cobalt-base alloys is Si Taili alloy, described Co-based alloy powder granularity is 150～320 mesh；Described TiC
Powder size is 5～50 μm.
The laser melting coating preparation technology of spheroidal graphite cast-iron surface the most according to claim 2 TiC/ cobalt-base alloys composite coating,
It is characterized in that: the preparation process of described TiC/ cobalt-base alloys composite powder is: by TiC powder and Co-based alloy powder by required
Ratio carries out proportioning, and uniformly mixes with grinder, and incorporation time is 20min-1h；Then the powder mixed is being dried
Carrying out drying and processing in case, drying temperature is 150～200 DEG C, and drying time is 2-5h, i.e. obtains described TiC/ cobalt-base alloys multiple
Close powder.
The laser melting coating preparation technology of spheroidal graphite cast-iron surface the most according to claim 1 TiC/ cobalt-base alloys composite coating,
It is characterized in that: described laser melting and coating technique detailed process is as follows:
Use 6kW CO2Laser instrument, automatic powder feeding system uses fore-put powder method；The side of being heated by resistive is adopted during laser melting coating
Spheroidal graphite cast-iron is heated by formula, and laser cladding technological parameter is: laser power P is 3.2～3.5kW, and scan velocity V is 400
～600mm/min, spot diameter 2mm, overlapping rate 1.5, use the side-blown protection of argon, three passage claddings.
The laser melting coating preparation technology of spheroidal graphite cast-iron surface the most according to claim 6 TiC/ cobalt-base alloys composite coating,
It is characterized in that: before Laser Cladding Treatment, the spheroidal graphite cast-iron surface of coating to be prepared cleared up, remove the rust stain on surface,
Then clean with acetone, in case laser melting coating is used；Laser cladding process use resistance heating manner carry out auxiliary to spheroidal graphite cast-iron
Helping heating, heating-up temperature is 200-350 DEG C.
8. the spheroidal graphite cast-iron surface TiC/ cobalt-base alloys composite coating prepared according to the arbitrary described technique of claim 1-7, it is special
Levy and be: in described TiC/ cobalt-base alloys composite coating, TiC is uniformly distributed in cobalt-base alloys tissue, and the TiC in coating includes
TiC arborescence and TiC granule, composite coating thickness is 1-5mm.
The spheroidal graphite cast-iron surface TiC/ cobalt-base alloys composite coating that the most according to claim 8, prepared by technique, it is characterised in that:
Described composite coating maximum hardness is 1200-1300HV0.2, composite coating hardness is more than 5 times of spheroidal graphite cast-iron matrix hardness.
The spheroidal graphite cast-iron surface TiC/ cobalt-base alloys composite coating that the most according to claim 8, prepared by technique, its feature exists
In: this composite coating is applied to the spheroidal graphite cast-iron part used under the conditions of strong wear.
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Effective date of registration: 20230925 Address after: 110001 room 3809, block a, Tongfang Plaza, No. 96, Sanhao Street, Heping District, Shenyang City, Liaoning Province Patentee after: Shenyang yuchengxin Achievement Transformation Technology Service Co.,Ltd. Address before: 110136, Liaoning, Shenyang moral and Economic Development Zone, No. 37 South Avenue moral Patentee before: SHENYANG AEROSPACE University |