CN110438488A - Roller surface flawless amorphous coating and preparation method thereof - Google Patents
Roller surface flawless amorphous coating and preparation method thereof Download PDFInfo
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- CN110438488A CN110438488A CN201910656128.6A CN201910656128A CN110438488A CN 110438488 A CN110438488 A CN 110438488A CN 201910656128 A CN201910656128 A CN 201910656128A CN 110438488 A CN110438488 A CN 110438488A
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C45/00—Amorphous alloys
- C22C45/02—Amorphous alloys with iron as the major constituent
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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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- Other Surface Treatments For Metallic Materials (AREA)
Abstract
The invention discloses a kind of roller surface flawless amorphous coating and preparation method thereof, preparation method includes that roller substrate pre-treatment, baking powder, laser preheated nip roll matrix, preset alloy powder and laser melting coating prepare flawless amorphous coating.The alloy powder is the amorphous powder of aeroponics preparation, and granularity is 150~250 mesh, and each component and its mass percent are as follows: iron 72%, boron 15%, silicon 10%, niobium 3%.The present invention is with Fe72B15Si10Nb3Alloy powder and optimize technique, so as to show to be made flawless amorphous coating in roll, amorphous coating surface flawless, dense internal organization, average Vickers hardness reaches 913.6HV, meets high rigidity, the technical requirements of wearability that cold roll uses.
Description
Technical field
The invention belongs to roller surface coat preparing technology fields, and in particular to a kind of roller surface flawless amorphous coating
And preparation method thereof.
Background technique
Steel and iron industry is the material base of developing national economy and national defense construction as important basic industry.Steel
Raw material, fuel and the auxiliary material resource situation of ironworker's industry, affect its commercial scale, product quality, economic benefit and cloth
Office direction.Roll is the main consumable part of all kinds of metal rolled core components become a useful person and milling train.It is hot and cold, high speed,
Under the interactive harsh operating condition of heavy duty, roll is also easy to produce roll surface fatigue flake, abrasion and body of roll fracture equivalent damage failure
Problem, this not only affects steel product quality and quantity, also results in the economic loss that should not be underestimated.
In recent years, researcher attempts using laser melting and coating technique repaired roller.But since laser melting and coating technique has very
High cooling velocity, the reasons such as difference of thermal expansion coefficient cause to apply between high residual stress and coating and matrix that chilling generates
Layer cracking, " intensity-toughness " the two relatively contradictory performances can not be solved effectively always.It is real under the conditions of laser technology
The combination of existing " intensity-toughness " mostly uses adjusting process parameter, addition rare earth element (such as Chinese patent literature at present
CN108546947A), the methods of gradient coating (such as Chinese patent literature CN109402631A) is prepared, but these methods often band
The problems such as coming cost increase, complex process, and not applicable industrialized production.
Summary of the invention
The purpose of the present invention is to solve the above problem, provides the roller surface of a kind of lower production costs, simple process
Flawless amorphous coating and preparation method thereof.
Realizing the technical solution of the object of the invention is: a kind of preparation method of roller surface flawless amorphous coating, comprising:
S1: roller substrate pre-treatment；
S2: powder is dried；
S3: laser preheated nip roll matrix；
S4: preset alloy powder；
S5: laser melting coating prepares flawless amorphous coating.
Roller substrate pre-treatment described in above-mentioned steps S1 is first to use grinder buffing roller substrate, to remove oxide, until
Expose metallic luster；Then roller substrate is placed in dehydrated alcohol and is cleaned by ultrasonic；It is stand-by finally to take out drying.
The material of the roller substrate is preferably 5Cr5WMoSiV cold roll.
Baking powder is that alloy powder is placed in vacuum oven described in above-mentioned steps S2, first vacuumizes, is then heated to 75
~85 DEG C of 2~4h of heat preservation, it is finally cooling with case.
The alloy powder is the amorphous powder of aeroponics preparation, and granularity is 150~250 mesh, each component and its quality hundred
Divide ratio as follows: iron 72%, boron 15%, silicon 10%, niobium 3%.
Laser preheated nip roll matrix described in above-mentioned steps S3 is the roller substrate after being handled before step S1 using laser
Surface is repeatedly scanned with, until roller substrate surface temperature reaches 150 DEG C.
The technological parameter of laser preheated nip roll matrix described in above-mentioned steps S3 are as follows: laser power is 0.3~0.7kW, laser
Scanning speed is 2~6mm/s, and laser head is apart from 300~350mm of roller substrate surface.
Preset alloy powder described in above-mentioned steps S4 is that the alloy powder after step S2 drying is laid in step S3 preheating
Roller substrate surface afterwards, powdering is with a thickness of 1.0~1.5mm.
It is to be carried out in argon atmosphere using laser that laser melting coating described in above-mentioned steps S5, which prepares flawless amorphous coating,
Flawless amorphous coating is made in laser melting coating.
Laser melting coating described in above-mentioned steps S5 prepares the technological parameter of flawless amorphous coating are as follows: argon gas flow velocity be 5~
15L/min, 2~3kW of laser power, laser scanning speed are 5~10mm/s, and laser head is apart from roller substrate surface distance 300
~350mm.
The argon gas is high-purity argon gas, purity 99.9%.
Above-mentioned laser is semiconductor broadband laser, and it is 14mm × 1.5mm that laser, which assembles spot size, i.e. painting slice width
Degree reaches 14mm.
Flawless amorphous coating made from any of the above-described method.
The good effect that the present invention has:
(1) present invention is with Fe72B15Si10Nb3Alloy powder and optimize technique, so as to roll show be made flawless
Amorphous coating, amorphous coating surface flawless, dense internal organization, average Vickers hardness reach 913.6HV, meet cold roll use
High rigidity, the technical requirements of wearability.
(2) present invention can reduce roller substrate in this way and apply by preheating to roller substrate before prepares coating
Thermal expansion coefficient difference between layer effectively mitigates the thermal stress generated in cladding process, can effectively remove coating surface and split
Line.
(3) present invention uses spot size for the semiconductor broadband laser of 14mm × 1.5mm, can significantly improve cladding
Efficiency.
(4) method and process of the invention is simple, low in cost, and controllability is strong, is suitable for industrialized production.
Detailed description of the invention
Fig. 1 is the XRD spectrum (X-ray diffraction of the alloy powder that embodiment 1 uses and flawless amorphous coating obtained
Map).
Fig. 2 is apparent form after the original apparent form of flawless amorphous coating made from embodiment 1 and dye penetrant inspection；Its
In, a figure is original apparent form, and b figure is apparent form after dye penetrant inspection.
Fig. 3 is scanning electron microscope (SEM) the microscopic structure shape in the section of flawless amorphous coating made from embodiment 1
Looks.
Fig. 4 is the micro-vickers hardness test result figure of flawless amorphous coating made from embodiment 1.
Specific embodiment
If not specified, present specification is mass percent for " % " in material composition description.If not saying especially
Bright, unclassified stores used in the present invention, raw material are the conventional raw material that can commercially obtain.It is used to set
Standby is also the conventional equipment of this field.Unmentioned operation is the routine operation of this field in the present invention.
(embodiment 1)
The preparation method of the roller surface flawless amorphous coating of the present embodiment is specific as follows:
S1: roller substrate pre-treatment.
Selecting material is the cold roll of 5Cr5WMoSiV, and being cut to diameter is 170mm, the circle with a thickness of 18mm
Block, as roller substrate.
Grinder buffing roller substrate is first used, to remove oxide, until exposing metallic luster；Then roller substrate is placed in
Ultrasonic cleaning 10min is carried out in dehydrated alcohol；It is stand-by finally to take out drying.
S2: powder is dried.
Alloy powder is placed in vacuum oven, is first vacuumized, 80 DEG C of heat preservation 3h are then heated to, it is finally cold with case
But.
The amorphous powder that the alloy powder that the present embodiment uses is prepared for aeroponics, granularity are 150~250 mesh, each component
And its mass percent is as follows: iron 72%, boron 15%, silicon 10%, niobium 3%.
S3: laser preheated nip roll matrix.
Roller substrate after being handled before step S1 with semiconductor broadband laser [model are as follows: Delias 3kW, similarly hereinafter]
Surface is repeatedly scanned with, until roller substrate surface temperature reaches 150 DEG C.
Specific process parameter is as follows: laser power 0.5kW, laser scanning speed 4mm/s, laser head is apart from roller substrate table
Face 330mm.
The laser for the semiconductor broadband laser that the present embodiment uses assembles spot size 14mm × 1.5mm.
S4: preset alloy powder.
By step S2 drying after alloy powder be laid in step S3 preheating after roller substrate surface, powdering with a thickness of
1.2mm namely amorphous coating with a thickness of 1.2mm.
S5: laser melting coating prepares flawless amorphous coating.
In 99.9% high-purity argon gas atmosphere, laser melting coating is carried out using semiconductor broadband laser [model is same as above], is made
Flawless amorphous coating.
Specific process parameter are as follows: argon gas flow velocity is 10L/min, laser power 2.5kW, laser scanning speed 8mm/s, is swashed
Shaven head is apart from roller substrate surface 330mm.
(test case 1)
The alloy powder and flawless amorphous coating obtained (also known as cladding layer) use to embodiment 1 carries out X-ray diffraction
(XRD) it tests, XRD spectrum is shown in Fig. 1.
As seen from Figure 1: alloy powder has very wide diffraction maximum in 2 θ=30~50 °, this is existing for amorphous phase
Characteristic feature.
Coating is by a small amount of amorphous phase and α-Fe, Fe2B phase composition.
In addition, each phase intensity is lower in coating, represent that microstructure crystallite dimension is smaller, this is also beneficial to improve coating
Intensity and toughness.
(test case 2)
Apparent form is shown in Fig. 2 respectively after the original apparent form of flawless amorphous coating made from embodiment 1 and dye penetrant inspection
A figure with b scheme.
As seen from Figure 2, flawless amorphous coating width produced by the present invention is up to 14mm, hence it is evident that cladding efficiency compared with
Height is suitable for industrialized production.
And can see from dye penetrant inspection figure, which is completely absent crackle without obvious hole or pit, toughness
Preferably, surface property is excellent.
(test case 3)
Flawless amorphous coating made from embodiment 1 is corroded into section through 10% nital, uses scanning electron microscope
(SEM) coating cross sections are observed, as a result see Fig. 3.
As seen from Figure 3, flawless amorphous coating of the invention is mainly by the α-Fe dendrite of grey and tiny Fe2B
Phase composition, the therebetween hard particles of a large amount of white richness Nb of Dispersed precipitate.In addition, amorphous coating is mutually evenly distributed, crystal grain is smaller, has
Conducive to the intensity and toughness for improving amorphous coating.
(test case 4)
The micro-vickers hardness of flawless amorphous coating, is as a result shown in Fig. 4 made from testing example 1.
As seen from Figure 4, the micro-vickers hardness of flawless amorphous coating of the invention is average hard more than 800HV
It spends up to 913.6HV, maximum hardness significantly improves wear-resisting property of the cold roll under weight heavy duty environment up to 980HV.
Claims (7)
1. a kind of roller surface flawless amorphous coating, the flawless amorphous coating is by following components and its mass percent group
At: iron 72%, boron 15%, silicon 10%, niobium 3%.
2. a kind of preparation method of roller surface flawless amorphous coating, characterized by comprising:
S1: roller substrate pre-treatment；
S2: powder is dried；
S3: laser preheated nip roll matrix；
S4: preset alloy powder；
S5: laser melting coating prepares flawless amorphous coating；
The alloy powder is the amorphous powder of aeroponics preparation, and granularity is 150~250 mesh, each component and its mass percent
It is as follows: iron 72%, boron 15%, silicon 10%, niobium 3%.
3. the preparation method of roller surface flawless amorphous coating according to claim 2, it is characterised in that: the roll
The material of matrix is 5Cr5WMoSiV cold roll.
4. the preparation method of roller surface flawless amorphous coating according to claim 2, it is characterised in that: above-mentioned steps
Laser preheated nip roll matrix described in S3 is repeatedly scanned with using the roller substrate surface after laser is handled before step S1, up to
Roller substrate surface temperature reaches 150 DEG C；Technological parameter are as follows: laser power be 0.3~0.7kW, laser scanning speed be 2~
6mm/s, laser head is apart from 300~350mm of roller substrate surface.
5. the preparation method of roller surface flawless amorphous coating according to claim 2, it is characterised in that: above-mentioned steps
It is to carry out laser melting coating in argon atmosphere using laser, nothing is made that laser melting coating described in S5, which prepares flawless amorphous coating,
Crackle amorphous coating；Technological parameter are as follows: argon gas flow velocity be 5~15L/min, 2~3kW of laser power, laser scanning speed be 5~
10mm/s, laser head is apart from 300~350mm of roller substrate surface distance.
6. the preparation method of roller surface flawless amorphous coating according to claim 4 or 5, it is characterised in that: above-mentioned
Laser is semiconductor broadband laser, and it is 14mm × 1.5mm that laser, which assembles spot size,.
7. the preparation method of roller surface flawless amorphous coating according to claim 2, it is characterised in that: above-mentioned steps
Roller substrate pre-treatment described in S1 is first to use grinder buffing roller substrate, to remove oxide, until exposing metallic luster；Then
Roller substrate is placed in dehydrated alcohol and is cleaned by ultrasonic；It is stand-by finally to take out drying；Described in above-mentioned steps S2 baking powder be by
Alloy powder is placed in vacuum oven, is first vacuumized, and 75~85 DEG C of 2~4h of heat preservation are then heated to, finally cooling with case；On
Stating preset alloy powder described in step S4 is that the alloy powder after step S2 drying is laid in the roll base after step S3 preheating
Body surface face, powdering is with a thickness of 1.0~1.5mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201910656128.6A CN110438488A (en) | 2019-07-19 | 2019-07-19 | Roller surface flawless amorphous coating and preparation method thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910656128.6A CN110438488A (en) | 2019-07-19 | 2019-07-19 | Roller surface flawless amorphous coating and preparation method thereof |
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Citations (8)
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|---|---|---|---|---|
| CN101899663A (en) * | 2010-08-06 | 2010-12-01 | 上海交通大学 | Laser preparation method of iron-based amorphous nanometer crystalline coat |
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