CN107119250A - A kind of multi-element alloy coat of hot roll and its preparation and spraying method - Google Patents
A kind of multi-element alloy coat of hot roll and its preparation and spraying method Download PDFInfo
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- C—CHEMISTRY; METALLURGY
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- C23C4/00—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge
- C23C4/04—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge characterised by the coating material
- C23C4/06—Metallic material
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- 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
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- C23C4/02—Pretreatment of the material to be coated, e.g. for coating on selected surface areas
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- 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
- C23C4/00—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge
- C23C4/04—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge characterised by the coating material
- C23C4/06—Metallic material
- C23C4/073—Metallic material containing MCrAl or MCrAlY alloys, where M is nickel, cobalt or iron, with or without non-metal elements
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- C23C4/00—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge
- C23C4/04—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge characterised by the coating material
- C23C4/10—Oxides, borides, carbides, nitrides or silicides; Mixtures thereof
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- 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
- C23C4/00—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge
- C23C4/12—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge characterised by the method of spraying
- C23C4/129—Flame spraying
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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
- C23C4/00—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge
- C23C4/18—After-treatment
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Abstract
The invention discloses a kind of hot roll multi-element alloy coat and its preparation and spraying method, belong to the recovery technique field of roll.A kind of hot roll multi-element alloy coat of the present invention, hot roll basic unit, transition zone and working lining are followed successively by from inside to outside, transition zone is NiCr or NiCrAl sprayed coatings, it is transition zone to spray NiCr or NiCrAl as metal bonding coating in hot roll basic unit, can eliminate the unmatched problem of material thermal expansion coefficient between antiwear heat resisting working lining and hot roll basic unit；Working lining is NiCr Cr3C2Composite coating, NiCr alloys have a performances such as excellent heat-resisting, corrosion-resistant, resistance to high temperature oxidation, and Cr3C2With preferable high temperature hardness and high temperature oxidation resistance, play hard phase.Moreover, NiCr Cr3C2With the linear expansion coefficient close with hot roll, so as to substantially reduce because thermal shock and caused by disbonding in addition fail, solve the technical problem of the present invention.
Description
Technical field
The present invention relates to the recovery technique field of roll, more particularly to a kind of hot roll multi-element alloy coat and its prepare and
Spraying method.
Background technology
Abrasion is one of three kinds of main causes (abrasion, corrosion and fatigue) of metal parts failure.Economy caused by it
Loss is very huge, the numeral that such as U.S. is announced for 1981, and it is beautiful that the loss caused every year due to abrasion is up to 100,000,000,000
Member.Wherein material consumption is about 20,000,000,000 dollars, equivalent to the 7% of material annual production.Because material wear ability is poor, China is big
The Loss of Life for measuring fundamental parts is generally significantly less than the level of external advanced product, therefore direct and indirect economic loss
It is also very surprising.Only with regard to metallurgical mine, agricultural machinery, coal, electric power and the incomplete statistics of five industrial departments of building materials, often
Year merely due to abrasive wear and the spare part that requires supplementation with are just up to 1,000,000 tons of steel, equivalent to 15~2,000,000,000 RMB.It is and for example mechanical
Industrial annual steel used, there are about half is consumed in the production of spare part, and the major part in spare part is due to the abrasion longevity
Life is high and fails, and such as from about 40% agricultural machinery and implement spare part is due to what abrasive wear was consumed, about 30% seamless steel tube for boiler be by
Failed in corrosive wear.Hot roll is warm caused by Yi Fashengyin heat fatigues under cyclic thermal stres effect because of high-temperature operation
Cracking, surface layer peeling and roll shaft breakage, surface abrasion etc.；Sinking roller is because by high temperature zinc liquid etch, and roll surface material and zinc
Liquid reaction produces the repeated action such as abrasive wear caused by sediment, and barrel diameter constantly diminishes, material hardness and wearability by
Gradually decline, until failure.Its usual operating temperature of hot roll is at 600 DEG C~800 DEG C, to the thermal shock resistance of coating material
Have high requirements；Roll is directly contacted with steel billet, it is necessary to powerful roll-force be born, so its surface will bear Powerful-grinder simultaneously
Damage, and to be also cooled to 100 DEG C~150 DEG C by hot rolling material heating and cooling water repeatedly, it is larger that roll is subjected to temperature change
Heat fatigue is acted on, and loss is very big.Therefore, the failure mode of roll is mainly heat cracks caused by heat fatigue and peeling, roll break
Split, body surface weares and teares, failure surface is almost covered with whole working face.
In addition to wear out failure, the roll with coating structure is also faced with because coating is peeled off with reference to caused by bad with matrix
Etc. failure mode.When coating and matrix have bubble, slag inclusion, layering, often face crack can be triggered before normal wear failure
Or surface peel off etc. failure.Because hot roll is under the influence of itself residual tension and cyclic thermal stres, anchoring strength of coating
And coating surface homogeneity of ingredients deficiency causes roll coating material thermal shock resistance not good enough.Sometimes, rolled in actually manufacture
During roller, often occurs micro-crack when coating material is combined bad with matrix, micro-crack occurs under the conditions of cyclic thermal stres
Extension is spread, so that peel off, or even body of roll fracture.Therefore, coating material is selected and preparation technology is very important
Influence factor.
Sadangi of Rutger universities of the U.S. et al. utilizes " spray drying → reduction decomposition → gas carburization " technique to prepare
Granularity is 0.6 μm of Cr3C2Powder (referring to R.K.Sadangi, L.E.McCandlish, B.H.Kear,
P.Seegopaul.Synthesisandcharacterizationofsubmicronvanadiumandchromiumcarbide
Graingrowthin hibitors.AdvancesinPowderMetallurgy＆ParticularMaterials, 1998：
P9-P15).Its technical process is：The precursor solution containing Cr is prepared first, is then spray-dried, then by spray drying
Powder is pyrolyzed, and the product after pyrolysis is carried out into gas carburization with CH4/H2 mixed gas.The subject matter that this method is present
It is that technique is more complicated, and the granularity of obtained chromium carbide powder is bigger than normal, it is impossible to chromium carbide powder is met in modern industry
Using.
Through retrieval, Chinese patent application, publication number：CN105951004A, publication date：2016.09.21, one kind is disclosed
Wear resistant corrosion resistant composite alloy roll roller and production technology, including roll body, described roll body are hollow cylinder, described roller
Body is made up of alloy steel layer and common steel layer, and integrally casting sets common steel layer, described alloy on the inside of described alloy steel layer
Steel layer includes following ingredients：C, Si, Mn, P, S, Cr, Ni, Mo, V, Ti, Al, Cu, W, Re, remaining is Fe and inevitably miscellaneous
Matter, generally, the invention have the production technology of innovation roll body, to cast Dai Gang, save quenching Step, effectively improve the resistance to of roll body
Corrosivity, wearability and intensity, improve the manufacturing precision of finished product roll body, extend the service life of roll body, and saving production makes
Former material doses is used, production cost is reduced.But the bond strength of the invention alloy steel layer and common steel layer is not high, applied to hot roll
When, it is easy to stress changes and occurs to peel off and fail.
The content of the invention
1. the invention technical problem to be solved
For there is the easy heat cracks of hot roll, surface layer peeling, roll shaft breakage, surface abrasion and existing in the prior art
Anchoring strength of coating and coating surface homogeneity of ingredients deficiency cause the problems such as roll coating material thermal shock resistance is not good enough,
The invention provides a kind of hot roll multi-element alloy coat and its preparation and spraying method.It by optimize multi-element alloy coat into
Divide and be distributed, with good heat-resistant antifriction performance, and reached the bond strength for improving bond coating and hot roll basic unit
Purpose.
2. technical scheme
Through analysis, the dominant mechanism of hot roll abrasion is：Certain point and stocking and support roller periodic contact on hot roll,
Oxide skin on stocking enters roll gap as abrasive particle.Meanwhile, under coolant and the collective effect of hot-rolling stock stress, roll top layer
Metal particle is constantly separated with the body of roll, and working lining is thinning, and barrel diameter diminishes, and hardness and wearability also all decline, when the body of roll is straight
When footpath and hardness drop to minimum allowable value, that is, failure is reached, need to be repaired in time.During actually manufacture roll, apply
Often there is micro-crack in layer material when being combined bad with hot roll basic unit, micro-crack spreads expansion under the conditions of cyclic thermal stres
Exhibition, so that peel off, or even body of roll fracture.Therefore, coating material selection and preparation technology be very important influence because
Element.
Based on material multi-component alloying it is theoretical and take into full account coating and hot roll basic unit physical and chemical performance (coefficient of expansion,
Modulus of elasticity) matching characteristic, analyzed with reference to roll literature survey and basic data, the present invention is selected with designing not coating material
Coating material service behaviour, such as wear-resistant, high temperature oxidation resisting and corrosion-resistant performance are only considered, because roll is cold in circulating
Alternating thermal stress is acted on, to prevent the material failure triggered by disbonding, bond strength and coating and hot roll basic unit
Physico-chemical property (coefficient of expansion etc.) matches the factor for needing emphasis to consider.
To reach above-mentioned purpose, the technical scheme that the present invention is provided is：
A kind of hot roll multi-element alloy coat, is followed successively by hot roll basic unit, transition zone and working lining, the mistake from inside to outside
Layer is crossed for NiCr or NiCrAl sprayed coatings, it is transition zone to spray NiCr or NiCrAl as metal bonding coating in hot roll basic unit,
The unmatched problem of material thermal expansion coefficient between antiwear heat resisting working lining and hot roll basic unit can be eliminated, to reduce by working
Thermal stress caused by layer and hot roll basic unit coefficient of expansion mismatch, improves the mechanical matching between working lining and hot roll basic unit
And physical compatibility；The working lining is NiCr-Cr3C2Composite coating, NiCr alloys have excellent heat-resisting, corrosion-resistant, anti-height
The performances such as temperature oxidation, also act as the effect of Binder Phase, Cr3C2With preferable high temperature hardness and high temperature oxidation resistance, hard phase is played
Effect, the effect of second phase particles dispersion-strengtherning is also primarily served in the coating, can solve the problem that hot roll in the complicated work of high temperature
Under condition easily loss, the problem of service life is relatively low.Moreover, NiCr-Cr3C2With the linear expansion coefficient close with hot roll, from
And can substantially reduce because thermal shock and caused by disbonding in addition fail so that solve the present invention technical problem.
Further technical scheme, NiCr the or NiCrAl spray layer thickness is 50~100 μm；The NiCr-Cr3C2
Composite coating thickness is 200~400 μm, and thickness is adjusted according to different ratio and spraying method.
In further technical scheme, NiCrAl sprayed coatings, Cr contents are 10~30%, Al content be 0~10%, Al,
Cr can suppress the oxidation of alloy-layer, but too high Al amounts can bring extra fragility, and Ni reacts with Al, change between generation metal
Compound, and amount of heat is discharged, make bond coating and hot roll substrate surface formation micro metallurgic bonding, so as to improve cohesive bottom
Layer and the bond strength of hot roll basic unit；The NiCr-Cr3C2In composite coating, Cr3C2Content is that 70~80%, NiCr is
20~30%, the NiCr tack coats and NiCr-Cr of the two percentage ranges3C2Cermet has preferably mutual fusibleness, wherein
Cr3C2Content is generally that 75%, NiCr is 25%, subsequently through the detection of the characterizing methods such as wearability, can be proved to be optimal ratio
Example.
A kind of preparation method of the multi-element alloy coat of hot roll, wherein, the Cr3C2Preparation method be：
Step one：Mixing：Ammonium dichromate powder and nanometer carbon black powder are placed in distilled water or deionized water, mixing is stirred
It is in uniformly flow-like to mix, and it is in presoma to add compressing in mould；In bulk after compacting, anxious jelly is carried out to facilitate；
Step 2：It is anxious to freeze：Presoma is quickly transferred to anxious freeze in space and carries out anxious jelly；The anxious purpose frozen is as short as possible
Time in allow fluid freeze, ammonium dichromate powder and nanometer carbon black powder to be positioned rapidly after stirring, to prevent stops shape stream
Body is layered due to the difference of density, causes the skewness of chromium source and carbon source after follow-up frozen dried, and causes carburizing reagent
Unbalanced adverse consequences；
Step 3：It is lyophilized：The anxious presoma frozen is quickly transferred in vacuum freeze drying cabin and freezed, after freezing
Blocks is many micropore shape honeycomb blocks formed after hydrone distils, and Volume Changes are small, uniform chromium source and carbon source positioning
It will not change, moreover, in freeze-drying process, following reaction occurs in drying process for ammonium dichromate powder at low temperature：
(NH4)2Cr2O7(s)=Cr2O3(s)+N2↑+4H2O(2-1)
Step 4：Carbonization：Vacuum freeze drying cabin cold-trap is closed, with the rise of temperature, carbon is gradually by the high price oxygen of chromium
Compound is reduced into the low oxide of chromium, and the carbon source that position is fixed with its peripheral location also reacted by relatively-stationary chromium source,
Uniform chromium carbide is ultimately generated, but also is nano level chromium carbide；Due to the uniformity of lyophilized rear blocks micropore,
The absorption of heat is also than more uniform in reaction, so as to realize the purpose of obtained even-grained nano level chromium carbide；
3Cr2O3(s)+13C (s)=2Cr3C2(s)+9CO(2-2)；
3(NH4)2Cr2O7(s)+13C (s)=2Cr3C2(s)+9CO+12H2O+3N2↑ (2-3) (W-response process).
In further preparation method, step one, the proportioning of ammonium dichromate and nanometer carbon black powder is 1：(0.17~
0.21), the residual to prevent blocking source or chromium source excessively；Distilled water or deionized water consumption are：The 55%~60% of powder gross weight,
It is suitable fluid completed state scope for the uniform mixing of ammonium dichromate and nanometer carbon black powder；It is anxious in step 2
It is -100~-140 DEG C to freeze temperature, and the time is 30~150min, to reach the rapid and thorough effect for forming blocks；Step 4
In, it is warming up to 900~1200 DEG C of progress carbonizing reductions.
In further preparation method, step 3, lyophilized technique curve is：
A, initial stage：0 DEG C~100 DEG C of plate temperature, 2 DEG C/min of heating slope, 100 DEG C are kept for 30~40 minutes, are evacuated to
Within 60Pa；
B, mid-term：Plate temperature is cooled to 80~85 DEG C/min, is kept for 50~60 minutes, vacuum control is within 100Pa；
C, later stage, plate temperature are cooled to 50~65 DEG C/min, are kept for 80~200 minutes, vacuum control is within 80Pa.
In freeze-drying process, the relative low temperature state of material is kept, prevents that reaction is excessively strong and causes reaction uneven；
A kind of spraying method of the multi-element alloy coat of hot roll, step is：
Step 1) pre-treatment：By hot rolling roller surface mechanical grinding, rear blasting treatment improves the adhesive force of spray film；
Step 2) spraying：Sprayed with HVOF methods, due to the present invention multi-element alloy coat in various composition,
Nano level granularity can be made, therefore, is sprayed with HVOF (supersonic spray coating) method, effect is more obvious, obtained
Alloy coat adhesive force is stronger, and the porosity of coating is smaller.
Further spraying method, in pre-treatment, polishing is polished substrate surface using 800#~1000# sand paper,
With washes of absolute alcohol, acetone degreasing；Hot rolling roller surface is mechanical grinding at least Sa3 grades of cleannes；Blasting treatment uses grain
Footpath is that 0.1~0.5mm iron-sands are abrasive particle, and compressed air pressure ＞ 0.8MPa, sandblasting distance is 80~100mm, sandblasting angle
For 20 °, smart rugosity is set to reach RZ40~70 μm.
In further spraying method, HVOF methods：
NiCr or NiCrAl spraying method parameter is：Oxygen flow：1900~2000SCFH；Kerosene oil flow：20~
21LPH；Powder feed rate is：4.5~5.5RPM；360~380mm of spray distance；
NiCr-Cr3C2Spraying method parameter be：Oxygen flow：1800~1900SCFH；Kerosene oil flow：22~23LPH；
Powder feed rate is：4.5~5.5RPM；360~380mm of spray distance.
Further spraying method, in addition to step 3)：After cooling laser remolten PROCESS FOR TREATMENT, laser are carried out with laser
Power is 900~1000W, and sweep speed is 550~600mm/min, 10 × 3mm of spot size.
3. beneficial effect
The technical scheme provided using the present invention, compared with prior art, is had the advantages that：
(1) a kind of hot roll multi-element alloy coat of the invention, in hot roll basic unit, spraying NiCr or NiCrAl is used as gold
It is transition zone to belong to tack coat, can eliminate material thermal expansion coefficient between antiwear heat resisting working lining and hot roll basic unit unmatched
Problem, to reduce the thermal stress as caused by being mismatched working lining and the hot roll basic unit coefficient of expansion, improves working lining and hot rolling
Mechanical matching and physical compatibility between roller basic unit；NiCr alloys also have the property such as excellent heat-resisting, corrosion-resistant, resistance to high temperature oxidation
Can, also act as the effect of Binder Phase, Cr3C2With preferable high temperature hardness and high temperature oxidation resistance, play hard phase,
The effect of second phase particles dispersion-strengtherning is also primarily served in coating, can solve the problem that hot roll is easily damaged under high temperature complex working condition
Consumption, the problem of service life is relatively low.Moreover, NiCr-Cr3C2With the linear expansion coefficient close with hot roll, so as to drop significantly
It is low because thermal shock and caused by disbonding even fail so that solve the present invention technical problem；
(2) a kind of hot roll multi-element alloy coat of the invention, can be according to different coating composition proportion and spraying method
The different coating layer thickness of regulation, to adapt to the hot roll of different size, highly versatile；
(3) a kind of hot roll multi-element alloy coat of the invention, the restriction of membranous layer ingredient proportioning, Al, Cr can suppress to close
The oxidation of layer gold, but too high Al amounts can bring extra fragility, and Ni reacts with Al, generates intermetallic compound, and discharge
Go out amount of heat, make bond coating and hot roll substrate surface formation micro metallurgic bonding, so as to improve bond coating and hot roll
The bond strength of basic unit, Al content has taken into account both sides factor for 0~10% restriction；And the coating of Al content 7.5%, warp
Contrast test, it is better；Cr3C2Content is that 70~80%, NiCr is 20~30%, what the two percentage ranges were limited
NiCr tack coats and NiCr-Cr3C2Cermet has preferably mutual fusibleness, wherein Cr3C2Content is generally that 75%, NiCr is
25%, subsequently through the detection of the characterizing methods such as wearability, optimal proportion can be proved to be；
(4) a kind of preparation method of the multi-element alloy coat of hot roll of the invention, especially Cr3C2Lyophilized technique system
Preparation Method, forerunner's blocks after freezing is many micropore shape honeycomb blocks formed after hydrone distils, and Volume Changes are small,
Even chromium source and carbon source positioning will not change, carbon source and the also relatively-stationary chromium source progress of its peripheral location that position is fixed
Reaction, ultimately generates uniform chromium carbide, but also be nano level chromium carbide；Blocks micropore is equal after due to freezing
Even property, the absorption of heat is also than more uniform in reaction, so as to realize the purpose of obtained even-grained nano level chromium carbide；
(5) a kind of preparation method of hot roll multi-element alloy coat of the invention, the use of lyophilized technique makes ammonium dichromate
To limit scope with the proportioning of nanometer carbon black powder can carry out as far as possible accurate determine according to chemical equation, it is to avoid excessive
Impurity, can prevent the excessive residual of carbon source or chromium source and influence film quality；
(6) in the preparation method of a kind of hot roll multi-element alloy coat of the invention, freeze-drying process, the model of temperature of heating plate
Restriction is enclosed, the relative low temperature state (being less than heating plate temperature) of material can be kept, prevents that reaction is excessively strong and causes reaction not
Uniformly；
(7) a kind of spraying method of hot roll multi-element alloy coat of the invention, is sprayed with HVOF methods, due to this
Various composition in the multi-element alloy coat of invention, can be made nano level granularity, therefore, with HVOF (supersonic spray coating)
Method is sprayed, and effect is more obvious, and obtained alloy coat adhesive force is stronger, and the porosity of coating is smaller；
(8) it is each in the spraying method of a kind of hot roll multi-element alloy coat of the invention, spraying pre-treatment and spraying
Kind of technological parameter, is that inventor combines nanoscale powder material produced by the present invention, is carrying out various data acquisitions, analysis, always
Obtained on the basis of the creative works such as knot, the intensity of obtained coating reaches more than 80MPa, and hardness reaches more than 1200HV,
Below porosity 1%, the more conventional 1Cr13 coatings of service life improve more than 1 times, more than 8000 tons of H profile steel steel rolling amount；Moreover,
In hardness test：NiCr/Cr3C2-20NiCr coatings are stepped up by interface to facing surface, microhardness, up to
1363.3HV；
(9) a kind of spraying method of hot roll multi-element alloy coat of the invention, laser remolten technique can make coating and base
Material formation metallurgical binding, the metallographic structure of its alloy-layer has fine and closely woven needle-like or dendritic eutectic structure, improves metal raw
The affinity of son, and then further increase coating and base material combination degree.
Brief description of the drawings
Fig. 1 is structural representation after the hot roll multi-element alloy coat amplification of the present invention；
Fig. 2 is the NiCr/1Cr13 coatings cross-section microhardness distribution figures of comparative example in embodiment；
Fig. 3 is NiCr/Cr3C2-20NiCr coatings cross-section microhardness distribution figures of the invention；
Fig. 4 is coating cross sections microhardness distribution statistical chart.
Embodiment
To further appreciate that present disclosure, the present invention is described in detail with reference to accompanying drawing (note：As do not indicated especially,
Content is expressed as weight content in embodiment).
Embodiment 1
The hot roll multi-element alloy coat of the present embodiment, as shown in figure 1, being followed successively by hot roll basic unit, transition from inside to outside
Layer and working lining, the transition zone are NiCr sprayed coatings；The working lining is NiCr-Cr3C2Composite coating.
The hot roll multi-element alloy coat material of the present embodiment prepares：NiCr nano powders, NiCr-Cr3C2Mix nano powder；
A kind of spraying method of the multi-element alloy coat of hot roll of the present embodiment, step is：
Step 1) pre-treatment：By hot rolling roller surface mechanical grinding, rear blasting treatment；
Step 2) spraying：Sprayed with HVOF methods.
The hot roll multi-element alloy coat of the present embodiment and its preparation and spraying method, in hot roll basic unit, spraying NiCr makees
It is transition zone for metal bonding coating, material thermal expansion coefficient can not be eliminated between antiwear heat resisting working lining and hot roll basic unit not
With the problem of, to reduce the thermal stress as caused by being mismatched working lining and the hot roll basic unit coefficient of expansion, improve working lining with
Mechanical matching and physical compatibility between hot roll basic unit；NiCr alloys also have excellent heat-resisting, corrosion-resistant, resistance to high temperature oxidation
Etc. performance, the effect of Binder Phase is also acted as, Cr3C2With preferable high temperature hardness and high temperature oxidation resistance, the work of hard phase is played
With also primarily serving the effect of second phase particles dispersion-strengtherning in the coating, can solve the problem that hot roll under high temperature complex working condition
Easily loss, the problem of service life is relatively low.Moreover, NiCr-Cr3C2With the linear expansion coefficient close with hot roll, so as to
Substantially reduce because thermal shock and caused by disbonding in addition fail so that solve the present invention technical problem
Embodiment 2
The hot roll multi-element alloy coat of the present embodiment, basic structure be the same as Example 1, difference is：Transition zone is
NiCrAl sprayed coatings.Ni can react with Al, generate intermetallic compound, and discharge amount of heat, make bond coating
Micro metallurgic bonding is formed with hot roll basic unit, so as to improve the bond strength of bond coating and hot roll basic unit.
Embodiment 3
The hot roll multi-element alloy coat of the present embodiment, basic structure be the same as Example 1 is different and the improvement is that：
NiCr spray layer thickness is 50 μm, and Cr contents are that 10%, Ni contents are 90%；NiCr-Cr3C2Composite coating thickness is 200 μm,
Cr3C2Content is that 70%, NiCr is 30%, the NiCr tack coats and NiCr-Cr of this percentage range3C2Cermet has
Preferably mutual fusibleness.
The hot roll multi-element alloy coat material of the present embodiment prepares：NiCr nano powders, NiCr-Cr3C2Mix nano powder,
Wherein, nanometer Cr3C2The preparation method of powder is：
Step one：Mixing：By ammonium dichromate powder and nanometer carbon black powder by weight 1：0.17 proportioning is placed in powder
In the distilled water of gross weight 55%, it is mixed evenly in flow-like, it is in presoma to add compressing in square dies；Compacting
Afterwards in bulk, anxious jelly is carried out to facilitate；
Step 2：It is anxious to freeze：Presoma is quickly transferred to -100 DEG C of anxious freeze in space and carries out anxious jelly 150min；The anxious purpose frozen
It is to allow fluid freeze, ammonium dichromate powder and nanometer carbon black powder to be positioned rapidly after stirring in the time as short as possible,
To prevent block fluid to be layered due to the difference of density, the skewness of chromium source and carbon source after follow-up frozen dried is caused；
Step 3：It is lyophilized：The anxious presoma frozen is quickly transferred in vacuum freeze drying cabin and freezed, plate temperature control system
Below 100 DEG C, the blocks after freezing is many micropore shape honeycomb blocks formed after hydrone distils, and Volume Changes are small,
Uniform chromium source and carbon source positioning will not change, moreover, in freeze-drying process, ammonium dichromate powder drying process at low temperature
It is middle to occur following reaction：
(NH4)2Cr2O7(s)=Cr2O3(s)+N2↑+4H2O(2-1)；
Step 4：Carbonization：Vacuum freeze drying cabin cold-trap is closed, with the rise of temperature, carbon is gradually by the high price oxygen of chromium
Compound is reduced into the low oxide of chromium, and the carbon source that position is fixed with its peripheral location also reacted by relatively-stationary chromium source,
Uniform chromium carbide is ultimately generated, but also is nano level chromium carbide；Due to the uniformity of lyophilized rear blocks micropore,
The absorption of heat is also than more uniform in reaction, so as to realize the purpose of obtained even-grained nano level chromium carbide；
3Cr2O3(s)+13C (s)=2Cr3C2(s)+9CO (2-2) (carburizing reagent)；
3(NH4)2Cr2O7(s)+13C (s)=2Cr3C2(s)+9CO+12H2O+3N2↑ (2-3) (W-response process)；
A kind of spraying method of the multi-element alloy coat of hot roll of the present embodiment, step is：
Step 1) pre-treatment：By hot rolling roller surface mechanical grinding, polishing is using 800#~1000# carborundum papers to base material
Surface is polished, with washes of absolute alcohol, acetone degreasing；Hot rolling roller surface is mechanical grinding at least Sa3 grades of cleannes；Afterwards
Blasting treatment, is that 0.1mm iron-sands are abrasive particle using particle diameter, compressed air pressure 1.0MPa, sandblasting distance is 80mm, sandblasting angle
Spend for 20 °, smart rugosity is reached RZ40 μm；
Step 2) spraying：Sprayed with HVOF methods：
NiCr spraying method parameter is：Oxygen flow：1900SCFH；Kerosene oil flow：20LPH；Powder feed rate is：
4.5RPM；Spray distance 360mm；
NiCr-Cr3C2Spraying method parameter be：Oxygen flow：1800SCFH；Kerosene oil flow：22LPH；Powder feed rate
For： 4.5RPM；Spray distance 360mm.
A kind of multi-element alloy coat of hot roll of the present embodiment, after testing：
Anchoring strength of coating is tested：According to the assay method of GB/T 8642-2002 thermal spraying resisting binding strengths：It is made
The intensity of coating reach 89MPa；
Coating hardness is analyzed：Measured using Vickers, hardness reaches more than 1200HV；
Coating porosity is using painting cream method：By the paste even application containing test solution by cleaning and drying process
Specimen surface.Test solution in paste penetrates into coating porosity, is acted on parent metal, spot of the generation with characteristic color, right
Coloured speckle number is counted on lotion, you can obtain coating porosity, measures porosity 0.77%；
Coating service life is detected：In H profile steel milling train group, contrasted using steel rolling amount data：Service life is more normal
Advise 1Cr13 coatings and improve more than 1 times, 8800 tons of H profile steel steel rolling amount.
Embodiment 4
The hot roll multi-element alloy coat of the present embodiment, basic structure be the same as Example 1 is different and the improvement is that：
NiCr spray layer thickness is 100 μm, and Cr contents are that 30%, Ni contents are 70%；NiCr-Cr3C2Composite coating thickness is 400 μm,
Cr3C2Content is that 75%, NiCr is 25%, the NiCr tack coats and NiCr-Cr of this percentage range3C2Cermet also has
There is preferably mutual fusibleness.
The hot roll multi-element alloy coat material of the present embodiment prepares：NiCr nano powders, NiCr-Cr3C2Mix nano powder,
Wherein, nanometer Cr3C2The preparation method of powder is：
Step one：Mixing：By ammonium dichromate powder and nanometer carbon black powder by weight 1：0.21 proportioning is placed in powder
In the distilled water of gross weight 60%, it is mixed evenly in flow-like, it is in presoma to add compressing in square dies；With
In bulk after the compacting of 2Mpa pressure, thickness is depressed into for 3cm, and anxious jelly is carried out to facilitate；
Step 2：It is anxious to freeze：Presoma is quickly transferred to -140 DEG C of anxious freeze in space and carries out anxious jelly 30min；
Step 3：It is lyophilized：The anxious presoma frozen is quickly transferred in vacuum freeze drying cabin and freezed, lyophilized technique
Curve is：
A, initial stage：0 DEG C~100 DEG C of plate temperature, heating slope 2 DEG C/min, 100 DEG C are kept for 30 minutes, be evacuated to 60Pa with
It is interior；
B, mid-term：Plate temperature is cooled to 80 DEG C/min, is kept for 60 minutes, vacuum control is within 100Pa；
C, later stage, plate temperature are cooled to 50 DEG C/min, are kept for 200 minutes, vacuum control is within 80Pa.
Step 4：Carbonization：Vacuum freeze drying cabin cold-trap is closed, using the pattern of stage cooling again after being rapidly heated,
1200 DEG C are warming up in 30 minutes to keep being cooled to 1100 DEG C in 30 minutes, 10 minutes and keeping dropping again in 40 minutes, 10 minutes again
Temperature is cooled to 900 DEG C in 20 minutes, 10 minutes to 1000 DEG C of insulations and kept for 10 minutes again, and the advantage of this stage cooling is,
The stability of reaction is kept, and then the uniformity of carburizing reagent can be ensured and realized the more uniform nanoscale of granularity is made
Chromium carbide, detected through SEM ESEMs, particle size is about that between 35-40nm, granularity gap is smaller.
A kind of spraying method of the multi-element alloy coat of hot roll of the present embodiment, step is：
Step 1) pre-treatment：By hot rolling roller surface mechanical grinding, polishing is entered using 1000# carborundum papers to substrate surface
Row polishing, with washes of absolute alcohol, acetone degreasing；Hot rolling roller surface is mechanical grinding at least Sa3 grades of cleannes；Afterwards at sandblasting
Reason, is that 0.5mm iron-sands are abrasive particle using particle diameter, compressed air pressure 1.2MPa, and sandblasting distance is 100mm, and sandblasting angle is
20 °, smart rugosity is set to reach RZ70 μm；
Step 2) spraying：Sprayed with HVOF methods：
NiCr spraying method parameter is：Oxygen flow：2000SCFH；Kerosene oil flow：21LPH；Powder feed rate is：
5.5RPM；Spray distance 380mm；
NiCr-Cr3C2Spraying method parameter be：Oxygen flow：1900SCFH；Kerosene oil flow：23LPH；Powder feed rate
For： 5.5RPM；Spray distance 380mm.
A kind of multi-element alloy coat of hot roll of the present embodiment, after testing：
Anchoring strength of coating is tested：According to the assay method of GB/T 8642-2002 thermal spraying resisting binding strengths：It is made
The intensity of coating reach 97MPa；
Coating hardness is analyzed：Measured using Vickers, hardness reaches more than 1300HV,
Coating porosity is using painting cream method：By the paste even application containing test solution by cleaning and drying process
Specimen surface.Test solution in paste penetrates into coating porosity, is acted on parent metal, spot of the generation with characteristic color, right
Coloured speckle number is counted on lotion, you can obtain coating porosity, measures porosity 0.87%；
Coating service life is detected：In H profile steel milling train group, contrasted using steel rolling amount data：H profile steel steel rolling amount
9700 tons.
During detection, inventor is investigated thermal shock resistance of the coating under 500 DEG C of (being quenched once every 10min) hot conditions
Can, NiCr/Cr3C2-25NiCr coatings are through more than 50 circulations without peeling off.
Strength test：Using E-7 glue as binding agent, stretching experiment is carried out after solidification, with 0.1mm/min rate tensiles,
When tensile strength is 97.5MPa, bonding sample is broken, and the plane of disruption is in glued layer, to show that anchoring strength of coating is more than
97.5MPa。
Embodiment 5
The hot roll multi-element alloy coat of the present embodiment, basic structure be the same as Example 1 is different and the improvement is that：
NiCrAl spray layer thickness is 75 μm, and Cr contents are that 20%, Ni contents are 70%, and Al content is 10%；NiCr-Cr3C2It is compound
Coating layer thickness is 300 μm, Cr3C2Content is that 80%, NiCr is 20%.
The hot roll multi-element alloy coat material of the present embodiment prepares：NiCrAl nano powders, NiCr-Cr3C2Mix nanometer
Powder, wherein, nanometer Cr3C2The preparation method of powder is：
Step one：Mixing：By ammonium dichromate powder and nanometer carbon black powder by weight 1：0.19 proportioning is placed in powder
In the distilled water of gross weight 60%, it is mixed evenly in flow-like, it is in presoma to add compressing in square dies；With
In bulk after the compacting of 1.2Mpa pressure, thickness is depressed into for 2cm, and anxious jelly is carried out to facilitate；
Step 2：It is anxious to freeze：Presoma is quickly transferred to -120 DEG C of anxious freeze in space and carries out anxious jelly 80min；
Step 3：It is lyophilized：The anxious presoma frozen is quickly transferred in vacuum freeze drying cabin and freezed, lyophilized technique
Curve is：
A, initial stage：0 DEG C~100 DEG C of plate temperature, heating slope 2 DEG C/min, 100 DEG C are kept for 40 minutes, be evacuated to 60Pa with
It is interior；
B, mid-term：Plate temperature is cooled to 85 DEG C/min, is kept for 50 minutes, vacuum control is within 100Pa；
C, later stage, plate temperature are cooled to 55 DEG C/min, are kept for 120 minutes, vacuum control is within 80Pa.
Step 4：Carbonization：Vacuum freeze drying cabin cold-trap is closed, using the pattern of stage cooling again after being rapidly heated,
1200 DEG C are warming up in 40 minutes to keep being cooled to 1100 DEG C in 25 minutes, 10 minutes and keeping dropping again in 45 minutes, 10 minutes again
Temperature is cooled to 900 DEG C in 30 minutes, 5 minutes to 1000 DEG C of insulations and kept for 5 minutes again, and the advantage of this stage cooling is, protects
The stability of reaction is held, and then the uniformity of carburizing reagent can be ensured and realize that obtained granularity is more uniform nano level
Chromium carbide, is detected through SEM ESEMs, and particle size is about that between 35-40nm, granularity gap is smaller.
A kind of spraying method of the multi-element alloy coat of hot roll of the present embodiment, step is：
Step 1) pre-treatment：By hot rolling roller surface mechanical grinding, polishing is entered using 900# carborundum papers to substrate surface
Row polishing, with washes of absolute alcohol, acetone degreasing；Hot rolling roller surface is mechanical grinding at least Sa3 grades of cleannes；Afterwards at sandblasting
Reason, is that 0.25mm iron-sands are abrasive particle using particle diameter, compressed air pressure 1.0MPa, and sandblasting distance is 90mm, and sandblasting angle is
20 °, smart rugosity is set to reach RZ50 μm；
Step 2) spraying：Sprayed with HVOF methods：
NiCr spraying method parameter is：Oxygen flow：1950SCFH；Kerosene oil flow：20.82LPH；Powder feed rate is：
5.0RPM；Spray distance 380mm；
NiCr-Cr3C2Spraying method parameter be：Oxygen flow：1850SCFH；Kerosene oil flow：22.7LPH；Powder feed rate
For：5.0RPM；Spray distance 380mm, Spray gun nozzle length is 6In；
A kind of multi-element alloy coat of hot roll of the present embodiment, after testing：
Anchoring strength of coating is tested：According to the assay method of GB/T 8642-2002 thermal spraying resisting binding strengths：It is made
The intensity of coating reach 103.6MPa；
Coating hardness is analyzed：Measured using Vickers, hardness reaches more than 1350HV,
Coating porosity is using painting cream method：By the paste even application containing test solution by cleaning and drying process
Specimen surface.Test solution in paste penetrates into coating porosity, is acted on parent metal, spot of the generation with characteristic color, right
Coloured speckle number is counted on lotion, you can obtain coating porosity, measures porosity 0.87%；
Coating service life is detected：In H profile steel milling train group, contrasted using steel rolling amount data：H profile steel steel rolling amount
More than 10000 tons.
During detection, inventor is investigated thermal shock resistance of the coating under 500 DEG C of (being quenched once every 10min) hot conditions
Can, NiCr/Cr3C2-25NiCr coatings are through more than 60 circulations without peeling off.
Strength test：Using E-7 glue as binding agent, stretching experiment is carried out after solidification, with 0.1mm/min rate tensiles,
When tensile strength is 107.5MPa, bonding sample is broken, and the plane of disruption is in glued layer, to show that anchoring strength of coating is more than
107.5MPa。
Embodiment 6
The hot roll multi-element alloy coat of the present embodiment, basic structure be the same as Example 1 is different and the improvement is that：
NiCrAl spray layer thickness is 85 μm, and Cr contents are that 20%, Ni contents are 72.5%, and Al content is 7.5%；NiCr-Cr3C2It is multiple
It is 350 μm, Cr to close coating layer thickness3C2Content is that 80%, NiCr is 20%.
The hot roll multi-element alloy coat material of the present embodiment prepares：NiCrAl nano powders, NiCr-Cr3C2Mix nanometer
Powder, wherein, nanometer Cr3C2The preparation method of powder is：
Step one：Mixing：By ammonium dichromate powder and nanometer carbon black powder by weight 1：0.20 proportioning is placed in powder
In the distilled water of gross weight 60%, it is mixed evenly in flow-like, it is in presoma to add compressing in square dies；With
In bulk after the compacting of 1.4Mpa pressure, thickness is depressed into for 2.5cm, and anxious jelly is carried out to facilitate；
Step 2：It is anxious to freeze：Presoma is quickly transferred to -110 DEG C of anxious freeze in space and carries out anxious jelly 90min；
Step 3：It is lyophilized：The anxious presoma frozen is quickly transferred in vacuum freeze drying cabin and freezed, lyophilized technique
Curve is：
A, initial stage：0 DEG C~100 DEG C of plate temperature, heating slope 2 DEG C/min, 100 DEG C are kept for 35 minutes, be evacuated to 60Pa with
It is interior；
B, mid-term：Plate temperature is cooled to 80 DEG C/min, is kept for 50 minutes, vacuum control is within 100Pa；
C, later stage, plate temperature are cooled to 60 DEG C/min, are kept for 100 minutes, vacuum control is within 80Pa.
Step 4：Carbonization：Vacuum freeze drying cabin cold-trap is closed, using the pattern of stage cooling again after being rapidly heated,
1200 DEG C are warming up in 40 minutes to keep being cooled to 1100 DEG C in 25 minutes, 10 minutes and keeping dropping again in 45 minutes, 10 minutes again
Temperature is cooled to 900 DEG C in 30 minutes, 5 minutes to 1000 DEG C of insulations and kept for 5 minutes again, and the advantage of this stage cooling is, protects
The stability of reaction is held, and then the uniformity of carburizing reagent can be ensured and realize that obtained granularity is more uniform nano level
Chromium carbide, is detected through SEM ESEMs, and particle size is about that between 30-35nm, granularity gap is smaller.
A kind of spraying method of the multi-element alloy coat of hot roll of the present embodiment, step is：
Step 1) pre-treatment：By hot rolling roller surface mechanical grinding, polishing is entered using 900# carborundum papers to substrate surface
Row polishing, with washes of absolute alcohol, acetone degreasing；Hot rolling roller surface is mechanical grinding at least Sa3 grades of cleannes；Afterwards at sandblasting
Reason, is that 0.15mm iron-sands are abrasive particle using particle diameter, compressed air pressure 1.3MPa, and sandblasting distance is 80mm, and sandblasting angle is
20 °, smart rugosity is set to reach RZ40 μm；
Step 2) spraying：Sprayed with HVOF methods：
NiCr spraying method parameter is：Oxygen flow：1950SCFH；Kerosene oil flow：20.82LPH；Powder feed rate is：
5.0RPM；Spray distance 380mm；
NiCr-Cr3C2Spraying method parameter be：Oxygen flow：1850SCFH；Kerosene oil flow：22.7LPH；Powder feed rate
For：5.0RPM；Spray distance 380mm, Spray gun nozzle length is 6In；
Step 3)：Laser remolten PROCESS FOR TREATMENT is carried out after cooling with laser, laser power is 900W, and sweep speed is
550mm/min, 10 × 3mm of spot size.
Contrast test：NiCr/1Cr13 coatings, granularity, thickness and technological parameter are identical, obtained NiCr/1Cr13 coatings,
Using metallography microscope hardness analysis, as shown in Fig. 2 by interface to facing surface, hardness is 236.5,271.5,361.2,
525.4th, 608.7 and 844.7.
The multi-element alloy coat of the present embodiment uses metallography microscope hardness analysis, as shown in figure 3, by interface to surface layer table
Face, hardness is 253.4,334.1,751.2,1004.4,1122.9 and 1363.3.
It is as shown in Figure 4 that two kinds of coating cross sections hardness multi-point data acquisitions arrange result, it can be seen that NiCr/ of the invention
Cr3C2- 20NiCr coatings are stepped up by interface to facing surface, microhardness, up to 1363.3HV.
Strength test：Using E-7 glue as binding agent, stretching experiment is carried out after solidification, with 0.1mm/min rate tensiles,
When tensile strength is 115.0MPa, bonding sample is broken, and the plane of disruption is in glued layer, to show that anchoring strength of coating is more than
115.0MPa。
Embodiment 7
The hot roll multi-element alloy coat of the present embodiment, basic structure be the same as Example 1 is different and the improvement is that：
NiCrAl spray layer thickness is 75 μm, and Cr contents are that 20%, Ni contents are 78%, and Al content is 2%；NiCr-Cr3C2It is compound to apply
Thickness degree is 300 μm, Cr3C2Content is that 80%, NiCr is 20%.
The hot roll multi-element alloy coat material of the present embodiment prepares：NiCrAl nano powders, NiCr-Cr3C2Mix nanometer
Powder, wherein, nanometer Cr3C2The preparation method of powder is：
Step one：Mixing：By ammonium dichromate powder and nanometer carbon black powder by weight 1：0.18 proportioning is placed in powder
In the distilled water of gross weight 60%, it is mixed evenly in flow-like, it is in presoma to add compressing in square dies；With
In bulk after the compacting of 1.1Mpa pressure, thickness is depressed into for 3cm, and anxious jelly is carried out to facilitate；
Step 2：It is anxious to freeze：Presoma is quickly transferred to -130 DEG C of anxious freeze in space and carries out anxious jelly 100min；
Step 3：It is lyophilized：The anxious presoma frozen is quickly transferred in vacuum freeze drying cabin and freezed, lyophilized technique
Curve is：
A, initial stage：0 DEG C~100 DEG C of plate temperature, heating slope 2 DEG C/min, 100 DEG C are kept for 40 minutes, be evacuated to 60Pa with
It is interior；
B, mid-term：Plate temperature is cooled to 85 DEG C/min, is kept for 50 minutes, vacuum control is within 100Pa；
C, later stage, plate temperature are cooled to 55 DEG C/min, are kept for 120 minutes, vacuum control is within 80Pa.
Step 4：Carbonization：Vacuum freeze drying cabin cold-trap is closed, using the pattern of stage cooling again after being rapidly heated,
1200 DEG C are warming up in 40 minutes to keep being cooled to 1100 DEG C in 25 minutes, 10 minutes and keeping dropping again in 45 minutes, 10 minutes again
Temperature is cooled to 900 DEG C in 30 minutes, 5 minutes to 1000 DEG C of insulations and kept for 5 minutes again, and the advantage of this stage cooling is, protects
The stability of reaction is held, and then the uniformity of carburizing reagent can be ensured and realize that obtained granularity is more uniform nano level
Chromium carbide, is detected through SEM ESEMs, and particle size is about that between 35-40nm, granularity gap is smaller.
A kind of spraying method of the multi-element alloy coat of hot roll of the present embodiment, step is：
Step 1) pre-treatment：By hot rolling roller surface mechanical grinding, polishing is entered using 900# carborundum papers to substrate surface
Row polishing, with washes of absolute alcohol, acetone degreasing；Hot rolling roller surface is mechanical grinding at least Sa3 grades of cleannes；Afterwards at sandblasting
Reason, is that 0.20mm iron-sands are abrasive particle using particle diameter, compressed air pressure 1.3MPa, and sandblasting distance is 95mm, and sandblasting angle is
20 °, smart rugosity is set to reach RZ60 μm；
Step 2) spraying：Sprayed with HVOF methods：
NiCr spraying method parameter is：Oxygen flow：1950SCFH；Kerosene oil flow：20.82LPH；Powder feed rate is：
5.0RPM；Spray distance 380mm；
NiCr-Cr3C2Spraying method parameter be：Oxygen flow：1850SCFH；Kerosene oil flow：22.7LPH；Powder feed rate
For：5.0RPM；Spray distance 380mm, Spray gun nozzle length is 6In；
A kind of multi-element alloy coat of hot roll of the present embodiment, after testing：
Anchoring strength of coating is tested：According to the assay method of GB/T 8642-2002 thermal spraying resisting binding strengths：It is made
The intensity of coating reach 104.2MPa；
Coating hardness is analyzed：Measured using Vickers, hardness reaches more than 1310HV,
Coating porosity is using painting cream method：By the paste even application containing test solution by cleaning and drying process
Specimen surface.Test solution in paste penetrates into coating porosity, is acted on parent metal, spot of the generation with characteristic color, right
Coloured speckle number is counted on lotion, you can obtain coating porosity, measures porosity 1.37%；
Coating service life is detected：In H profile steel milling train group, contrasted using steel rolling amount data：H profile steel steel rolling amount
More than 12000 tons.
Embodiment 8
The hot roll multi-element alloy coat of the present embodiment, basic structure be the same as Example 1 is different and the improvement is that：
NiCrAl spray layer thickness is 85 μm, and Cr contents are that 20%, Ni contents are 72.5%, and Al content is 7.5%；NiCr-Cr3C2It is multiple
It is 350 μm, Cr to close coating layer thickness3C2Content is that 80%, NiCr is 20%.
The hot roll multi-element alloy coat material of the present embodiment prepares：NiCrAl nano powders, NiCr-Cr3C2Mix nanometer
Powder, wherein, nanometer Cr3C2The preparation method of powder is：
Step one：Mixing：By ammonium dichromate powder and nanometer carbon black powder by weight 1：0.20 proportioning is placed in powder
In the distilled water of gross weight 60%, it is mixed evenly in flow-like, it is in presoma to add compressing in square dies；With
In bulk after the compacting of 1.4Mpa pressure, thickness is depressed into for 2.5cm, and anxious jelly is carried out to facilitate；
Step 2：It is anxious to freeze：Presoma is quickly transferred to -110 DEG C of anxious freeze in space and carries out anxious jelly 90min；
Step 3：It is lyophilized：The anxious presoma frozen is quickly transferred in vacuum freeze drying cabin and freezed, lyophilized technique
Curve is：
A, initial stage：0 DEG C~100 DEG C of plate temperature, heating slope 2 DEG C/min, 100 DEG C are kept for 35 minutes, be evacuated to 60Pa with
It is interior；
B, mid-term：Plate temperature is cooled to 80 DEG C/min, is kept for 50 minutes, vacuum control is within 100Pa；
C, later stage, plate temperature are cooled to 60 DEG C/min, are kept for 100 minutes, vacuum control is within 80Pa.
Step 4：Carbonization：Vacuum freeze drying cabin cold-trap is closed, using the pattern of stage cooling again after being rapidly heated,
1200 DEG C are warming up in 40 minutes to keep being cooled to 1100 DEG C in 25 minutes, 10 minutes and keeping dropping again in 45 minutes, 10 minutes again
Temperature is cooled to 900 DEG C in 30 minutes, 5 minutes to 1000 DEG C of insulations and kept for 5 minutes again, and the advantage of this stage cooling is, protects
The stability of reaction is held, and then the uniformity of carburizing reagent can be ensured and realize that obtained granularity is more uniform nano level
Chromium carbide, is detected through SEM ESEMs, and particle size is about that between 30-35nm, granularity gap is smaller.
A kind of spraying method of the multi-element alloy coat of hot roll of the present embodiment, step is：
Step 1) pre-treatment：By hot rolling roller surface mechanical grinding, polishing is entered using 900# carborundum papers to substrate surface
Row polishing, with washes of absolute alcohol, acetone degreasing；Hot rolling roller surface is mechanical grinding at least Sa3 grades of cleannes；Afterwards at sandblasting
Reason, is that 0.15mm iron-sands are abrasive particle using particle diameter, compressed air pressure 1.3MPa, and sandblasting distance is 80mm, and sandblasting angle is
20 °, smart rugosity is set to reach RZ40 μm；
Step 2) spraying：Sprayed with HVOF methods：
NiCr spraying method parameter is：Oxygen flow：1950SCFH；Kerosene oil flow：20.82LPH；Powder feed rate is：
5.0RPM；Spray distance 380mm；
NiCr-Cr3C2Spraying method parameter be：Oxygen flow：1850SCFH；Kerosene oil flow：22.7LPH；Powder feed rate
For：5.0RPM；Spray distance 380mm, Spray gun nozzle length is 6In；
Step 3)：Laser remolten PROCESS FOR TREATMENT is carried out after cooling with laser, laser power is 1000W, and sweep speed is
550mm/min, 10 × 3mm of spot size.
Embodiment 9
The hot roll multi-element alloy coat of the present embodiment and its preparation and spraying method, basic structure be the same as Example 8 are different
With the improvement is that：Step 3)：Laser remolten PROCESS FOR TREATMENT is carried out after cooling with laser, laser power is 900W, scanned
Speed is 600mm/min, 10 × 3mm of spot size.
Embodiment 10
The hot roll multi-element alloy coat of the present embodiment and its preparation and spraying method, basic structure be the same as Example 9 are different
With the improvement is that：Step 3)：Laser remolten PROCESS FOR TREATMENT is carried out after cooling with laser, laser power is 950W, scanned
Speed is 580mm/min, 10 × 3mm of spot size.
Schematical above that the present invention and embodiments thereof are described, the description does not have restricted, institute in accompanying drawing
What is shown is also one of embodiments of the present invention, and actual structure is not limited thereto.So, if the common skill of this area
Art personnel are enlightened by it, without departing from the spirit of the invention, are designed and the technical scheme without creative
Similar frame mode and embodiment, all should belong to protection scope of the present invention.
Claims (10)
1. a kind of multi-element alloy coat of hot roll, it is characterised in that be followed successively by hot roll basic unit, transition zone and work from inside to outside
Make layer, the transition zone is NiCr or NiCrAl sprayed coatings；The working lining is NiCr-Cr3C2Composite coating.
2. hot roll multi-element alloy coat according to claim 1, it is characterised in that：NiCr the or NiCrAl sprayed coatings
Thickness is 50~100 μm；The NiCr-Cr3C2Composite coating thickness is 200~400 μm.
3. the multi-element alloy coat of hot roll according to claim 2, it is characterised in that：In the NiCrAl sprayed coatings,
Cr contents are 10~30%, and Al content is 0~10%；The NiCr-Cr3C2In composite coating, Cr3C2Content is 70~80%,
NiCr is 20~30%.
4. a kind of preparation method of multi-element alloy coat according to any described hot roll of claims 1 to 3, its feature exists
In：The Cr3C2Preparation method be：
Step one：Mixing：Ammonium dichromate powder and nanometer carbon black powder are placed in distilled water or deionized water, mixed equal
Even is in flow-like, and it is in presoma to add compressing in mould；
Step 2：It is anxious to freeze：Presoma is quickly transferred to anxious freeze in space and carries out anxious jelly；
Step 3：It is lyophilized：The anxious presoma frozen is quickly transferred in vacuum freeze drying cabin and freezed；
Step 4：Carbonization：Vacuum freeze drying cabin cold-trap is closed, heating carries out carbonizing reduction reaction and nanometer Cr is made3C2Powder.
5. the preparation method of the multi-element alloy coat of hot roll according to claim 4, it is characterised in that：The step one
In, the proportioning of ammonium dichromate and nanometer carbon black powder is 1：(0.17~0.21)；Distilled water or deionized water consumption are：Powder is total
The 55%~60% of weight；It is -100~-140 DEG C suddenly to freeze temperature in step 2, and the time is 30~150min；In step 4, heating
To 900~1200 DEG C of progress carbonizing reductions.
6. the preparation method of the multi-element alloy coat of hot roll according to claim 4, it is characterised in that：In step 3,
Lyophilized technique curve is：
A, initial stage：0 DEG C~100 DEG C of plate temperature, heating slope 2 DEG C/min, 100 DEG C are kept for 30~40 minutes, be evacuated to 60Pa with
It is interior；
B, mid-term：Plate temperature is cooled to 80~85 DEG C/min, is kept for 50~60 minutes, vacuum control is within 100Pa；
C, later stage, plate temperature are cooled to 50~65 DEG C/min, are kept for 80~200 minutes, vacuum control is within 80Pa.
7. a kind of spraying method of the multi-element alloy coat of hot roll according to claim 6, it is characterised in that step
For：
Step 1) pre-treatment：By hot rolling roller surface mechanical grinding, rear blasting treatment；
Step 2) spraying：Sprayed with HVOF methods.
8. the spraying method of the multi-element alloy coat of hot roll according to claim 7, it is characterised in that the pre-treatment
In, polishing is polished substrate surface using 800#~1000# sand paper, with washes of absolute alcohol, acetone degreasing；By hot roll
Surface is mechanical grinding to Sa3 grades of cleannes；Blasting treatment is that 0.1~0.5mm iron-sands are abrasive particle, compressed air pressure using particle diameter
Power ＞ 0.8MPa, sandblasting distance is 80~100mm, and sandblasting angle is 20 °, smart rugosity is reached RZ40~70 μm.
9. the spraying method of the multi-element alloy coat of hot roll according to claim 7, it is characterised in that the HVOF side
In method：
NiCr or NiCrAl spraying method parameter is：Oxygen flow：1900~2000SCFH；Kerosene oil flow：20~21LPH；
Powder feed rate is：4.5~5.5RPM；360~380mm of spray distance；
NiCr-Cr3C2Spraying method parameter be：Oxygen flow：1800~1900SCFH；Kerosene oil flow：22~23LPH；Powder feeding
Speed is：4.5~5.5RPM；360~380mm of spray distance.
10. the spraying method of the multi-element alloy coat of hot roll according to claim 9, it is characterised in that also including step
It is rapid 3)：Carrying out laser remolten PROCESS FOR TREATMENT after cooling with laser, laser power is 900~1000W, sweep speed is 550~
600mm/min, 10 × 3mm of spot size.
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