CN101113487A - Annealing furnace roller surface peening coating and method for making same - Google Patents
Annealing furnace roller surface peening coating and method for making same Download PDFInfo
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- CN101113487A CN101113487A CNA2007100300824A CN200710030082A CN101113487A CN 101113487 A CN101113487 A CN 101113487A CN A2007100300824 A CNA2007100300824 A CN A2007100300824A CN 200710030082 A CN200710030082 A CN 200710030082A CN 101113487 A CN101113487 A CN 101113487A
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Abstract
The invention relates to a strengthening coating of the surface of an annealing furnace roller and a preparation method thereof. The preparation of the strengthening coating on the surface of a roller base is performed by a selected hot-spray method. The strengthening coating comprises a bonded coating, a working coating and a transition coating between the bonded coating and the working coating. The proportion of alloy and ceramic in every coating is changed according to gradient, which means that the proportion of alloy is decreased gradually from inner to outer in every coating; while the proportion of ceramic is increased gradually and at last a gradient coating is formed. The invention not only ensures the working coating to have good antioxidation, abrasion resisting and anti- nodulation performances, but also improves the binding performance of strengthening coating and the roller base and improves the cohesion binding performance of the coating inner. Under the function of the strengthening coating of the annealing furnace roller surface made by the method of the invention, the service life of the furnace roller can be prolonged and the using cost and repairing cost can be decreased.
Description
Technical field
The present invention relates to a kind of annealing furnace roller surface peening coating and preparation method thereof, be specially adapted to cold rolling, cold-rolling galvanization and silicon steel annealing furnace roller, also can be used for surface peening coating of metal or alloy parts under other similar working condition and preparation method thereof.
Background technology
Furnace roller on cold rolling, cold-rolling galvanization and the silicon steel steel plate production line in the continuous annealing furnace is to be used to transmit steel plate, and annealing furnace roller is on active service under 600-1200 ℃ of high temperature and weak oxide or reducing atmosphere environment.The chemical substance that the fluctuation of atmosphere and preposition operation residue in steel strip surface in the stove causes the existence of a small amount of oxygen element, the relatively sliding and the high temperature that do not match and surface in contact occurs of steel band speed and roller rotating speed cause furnace roller and steel band to do relative movement and can cause roll surface wear; The existence of oxygen element can cause the selective oxidation of roll surface and degradation; Speed does not match and causes iron-based type transfer of granules to adhere to roller surfaces formation dross; Steel strip surface oxide compound and roller surfaces material form compound and dross.If furnace roller may wear to a certain degree, or relatively large dross occurs,, need change or repair influencing the quality of surface of steel plate.Along with steel plate thickness is more and more thinner, production rate is more and more faster, and the requirement of plate surface quality is more and more higher, and is just more and more higher to the requirement of continuous annealing furnace central roll surface property, requires it to have better high temperature abrasion resistance and high temperature resistive connection knurl.
In order to improve surface quality while in effective work-ing life that prolongs furnace roller of steel band, current method is at furnace roller surface preparation strengthening layer.In the prior art, the main technical schemes of preparation strengthening layer has:
With superalloy,, be applied to the surface strengthening of furnace roller as Co base, Fe base or Ni base alloy.Although superalloy can form the coating with roller base good combination, its high-temperature wearable and high temperature resistive connection knurl performance are still not ideal enough.
For promoting the high temperature abrasion resistance and the high temperature resistive connection knurl on furnace roller surface, common technical scheme adopts metal or alloy to add pottery in addition and forms composite coating.Considerable patent documentation discloses the technical scheme of roller surface peening coating material, so that the furnace roller surface has is anti-oxidant, wear-resistant, the superperformance of resistive connection knurl, as:
(1) to propose with Co be that base contains Cr, Ta, C and adds Mn, Si, Al and compound oxidate ceramic material and improve its high temperature abrasion resistance for United States Patent (USP) 4124737.
(2) Japanese Patent 57-51057 proposes all the other materials for the metallic element formation of Nb that stove roller surface coatings contains above 15%wt. and improves resistive connection knurl performance.
(3) United States Patent (USP) 4822689 proposes coating ingredients and comprises 60-95%vol refractory oxide and Co base or Fe base or Ni base alloy and improve high temperature abrasion resistance and resistive connection knurl.
(4) Japanese Patent JP225590 proposition serves as that base adds MgAl2O4, MgO, the Y2O3 stupalith improves the resistive connection knurl with the MCrAlY superalloy.
(5) disclosed Chinese patent application 200510025632.4 and 200410066937.5 improve high temperature abrasion resistance and resistive connection knurl by oxide compound and the boride that adds different ratios in MCrAlY.
Above-mentioned strengthened coat has good anti-oxidant, wear-resistant, resistive connection knurl performance.Stupalith especially infusible oxide ceramics high temperature abrasion resistance and high temperature resistive connection knurl is good, but its coefficient of thermal expansion is much smaller than metal and alloy material, if directly prepare strengthened coat at the roller primary surface in the thermospray mode, under the relatively low temperature peeling off of coating will appear; Add the matching that will weaken the coefficient of thermal expansion of coating and matrix in the metal or alloy to, also can reduce associativity.
Be the combine problem of solution strengthened coat with the roller base, the solution thinking of prior art is to prepare the tie coat of layer of Ni-Al, Ni-Cr as bond coating, because its coefficient of thermal expansion and roller sill comparatively mate, can improve combining of strengthened coat and roller base to a certain extent, but there is the unmatched problem of coefficient of thermal expansion equally between bond coating and the work coating, the formation of material itself still is not enough to satisfy the requirement of being on active service under the long term high temperature in addition.
In sum, for promoting the high temperature abrasion resistance and the resistive connection knurl of metal or alloy, need solve by the interpolation of stupalith.Addition helps high temperature abrasion resistance and resistive connection knurl for a long time, but can cause bonding properties to descend; Add and lack, otherwise then.The prior art of the surface peening coating of roller base all can't realize existing good high temperature abrasion resistance and resistive connection knurl, and the technical requirements of good bonding properties is arranged again.
Summary of the invention
The invention provides a kind of annealing furnace roller surface peening coating and preparation method thereof, prepare gradient cladding in the thermospray mode, purpose is to overcome the defective that exists in the above-mentioned prior art, contradiction between the good combination of solution strengthened coat and high-temperature wearable, the resistive connection knurl, make existing good high temperature abrasion resistance of strengthened coat and resistive connection knurl, can combine with the roller base is good again, thus the work-ing life of improving furnace roller.
Realize a kind of annealing furnace roller surface peening coating of the object of the invention, its technical scheme is:
A kind of annealing furnace roller surface peening coating is fixed on the roller primary surface by heat spraying method, comprises the tie coat between bonding coat, work coating and bonding coat and the work coating.The bonding coat material can be an alloy material, also can be to be base with the alloy, is the matrix material of additive with the pottery; Tie coat and work coating all are to be base with the alloy, and pottery is the matrix material of additive.The alloy content of bonding coat is the highest, and tie coat takes second place, and the work coating is minimum, and the ceramic content of bonding coat is minimum, and tie coat takes second place, and the work coating is the highest, thereby forms gradient cladding.
Described tie coat can be one deck, also can be multilayer.Tie coat is two-layer or two-layer when above, and the alloy content in the tie coat of upper strata is lower than lower floor's tie coat, and the ceramic content in the tie coat of upper strata is higher than lower floor's tie coat.
Described alloy is a kind of in Co base alloy, Fe base alloy, the Ni base alloy, preferred Co base alloy.
Described pottery can be an oxide compound, comprises one or more the mixing in the oxide compound of Al, Cr, Zr, Y, Si, Ca, Mg etc., preferred Al
2O
3, or Al
2O
3And Cr
2O
3Mixing.
Surface peening coating can be three layers, and pottery is an oxide compound, comprises one or more the mixing in the oxide compound of Al, Cr, Zr, Y, Si, Ca, Mg etc., preferred Al
2O
3, or Al
2O
3And Cr
2O
3Mixing.Wherein the first layer is a bonding coat, and ceramic content is 0-15%wt.; The second layer is a tie coat, and ceramic content is 15-30%wy; The 3rd layer is the work coating, and ceramic content is 30%-50%wt..
Surface peening coating also can be five layers, comprises three layers of tie coat, and pottery is Al
2O
3, or Al
2O
3And Cr
2O
3Mixing, wherein the first layer is a bonding coat, Al
2O
3And Cr
2O
3Content is respectively 0-10%wt. and 0-6%wt.; Second layer Al
2O
3And Cr
2O
3Content is respectively 10-20%wt. and 0-7%wt.; The 3rd layer of Al
2O
3And Cr
2O
3Content is respectively 20-30%wt. and 0-8%wt.; The 4th layer of Al
2O
3And Cr
2O
3Content is respectively 30-40%wt. and 0-9%wt.; Layer 5 is the work coating, Al
2O
3And Cr
2O
3Content is respectively 40-50%wt. and 0-10%wt..
Described stupalith can also be the mixing of oxide compound, carbide and boride, and oxide compound comprises one or more the mixing in the oxide compound of Al, Cr, Zr, Y, Si, Ca, Mg etc.; Carbide comprises one or more the mixing in the carbide of Cr, Ti, Si, W, B etc.; Boride comprises one or more the mixing in the boride of Mo, Ti, Zr, Cr etc.The ceramic content of bonding coat and inter coat is 0-15%wt., and the ceramic content of work coating is 15%-50%wt., and carbide accounts for 0.1-20%wt. in the stupalith, and boride accounts for 0.1-30%wt., and all the other are oxide compounds.In the stupalith of work coating, carbide accounts for 0.1-10%wt., and boride accounts for 0.1-20%wt., and all the other are oxide compounds.
Described bonding coat material prepares at the roller primary surface with HVOF (High Velocity Oxygen Fuel) or detonation flame spraying method, forms bonding coat; The tie coat material on bonding coat, forms tie coat with flame plating, plasma spraying, HVOF (High Velocity Oxygen Fuel) or the preparation of detonation flame spraying method; The work coated material on tie coat, forms the work coating with flame plating, plasma spraying, HVOF (High Velocity Oxygen Fuel) or the preparation of detonation flame spraying method; The surface peening coating thickness of preparation is 80-200 μ m.
Realize the preparation method of a kind of annealing furnace roller surface peening coating of the object of the invention, its technical scheme is:
Step 1, pair roller primary surface carry out pre-treatment;
The material of step 2, selected preparation surface peening coating comprises bonding coat, tie coat and work coated material; The bonding coat material can be an alloy material, also can be to be base with the alloy, is the matrix material of additive with the pottery; Tie coat and work coating all are base with the alloy, and alloy is a kind of in Co base alloy, Fe base alloy, the Ni base alloy; Additive is a pottery, and pottery is an oxide compound, can also be the mixing of oxide compound, carbide and boride; The alloy content of bonding coat is the highest, and tie coat takes second place, and the work coating is minimum, and the ceramic content of bonding coat is minimum, and tie coat takes second place, and the work coating is the highest; Described tie coat can be a multilayer, and the alloy material content in the tie coat of upper strata is lower than lower floor's tie coat, and the ceramic content in the tie coat of upper strata is higher than lower floor's tie coat;
Step 3, with bonding coat material HVOF (High Velocity Oxygen Fuel) or detonation flame spraying at the roller primary surface, form bonding coat;
Step 4, with the flame plating of tie coat material, plasma spraying, HVOF (High Velocity Oxygen Fuel) or detonation flame spraying on bonding coat, form tie coat;
Step 5, will work coated material flame plating, plasma spraying, HVOF (High Velocity Oxygen Fuel) or detonation flame spraying on tie coat, form the work coating;
The thickness of the surface peening coating of step 6, preparation is 80-200 μ m; The work coatingsurface is carried out grinding and/or is polished to Ra is 0.1-3 μ m, and optimum range is Ra0.1-2.5 μ m.
Step 7, the furnace roller that has prepared surface peening coating is carried out postheat treatment.
Beneficial effect of the present invention is, prepare strengthened coat by selected heat spraying method at the roller primary surface, comprise bonding coat, work coating and bonding coat, tie coat between the work coating, each coated material interalloy and ceramic ratio are according to graded, promptly from inside to outside, alloy ratio in each coating gradually reduces, and ceramic ratio progressively increases, the final gradient cladding that forms, it is well anti-oxidant not only to make the work coating have, wear-resistant and resistive connection knurl performance, also improved the bonding properties of strengthened coat and roller base, and the interior coalescent performance of closing of coating inside.Like this,, can prolong the work-ing life of furnace roller, reduce and use and rehabilitation cost by the annealing furnace roller surface peening coating of method preparation of the present invention.
Embodiment
The present invention will be further described below by embodiment:
Embodiment 1-3 is the annealing furnace roller surface peening coating of three-decker, and wherein the first layer (internal layer) is a bonding coat, and the second layer (middle layer) is a tie coat, and the 3rd layer (skin) is the work coating.
(1) the pair roller primary surface carries out pre-treatment, is included in to carry out the stress relief annealing processing in the stove;
(2) material of selected preparation surface peening coating, as shown in the table:
| Coating | The first layer | The second layer | The 3rd layer |
| Embodiment 1 | Co base alloy | Co base alloy+20%Al 2O 3 +5％Cr 2O 3 | Co base alloy+40%Al 2O 3 +10％Cr 2O 3 |
| Embodiment 2 | Co base alloy+8%Al 2O 3 | Co base alloy+16%Al 2O 3 | Co base alloy+30%Al 2O 3 |
| Embodiment 3 | Co base alloy | Co base alloy+25%Al 2O 3 +3％CrB 2 +2％Cr 3C 2 | Co base alloy+45%Al 2O 3 +2％CrB 2 +0.2％Cr 3C 2 |
(3) with bonding coat material detonation flame spraying at the roller primary surface, form bonding coat;
(4) with tie coat material HVOF (High Velocity Oxygen Fuel) or detonation flame spraying on bonding coat, form tie coat;
(5) will work coated material HVOF (High Velocity Oxygen Fuel) or detonation flame spraying on tie coat, form the work coating; The total thickness of surface peening coating is about 150 μ m.
(6) the work coatingsurface being carried out grinding and/or is polished to Ra is 1.5 μ m;
(7) furnace roller that has prepared surface peening coating is carried out postheat treatment.
Annealing furnace roller surface peening coating according to embodiment 1-3 preparation is three-decker, comprises by bonding coat, tie coat and work coating.Stupalith is higher in the work coating, therefore has well anti-oxidant, wear-resistant and resistive connection knurl performance.And each coated material interalloy and ceramic ratio be according to graded, and promptly from inside to outside, the alloy ratio in each coating gradually reduces, and ceramic ratio progressively increases, finally form gradient cladding, improved the bonding properties of strengthened coat and roller sill, and the interior coalescent performance of closing of coating inside.
Select for use the roller sill to make the coupon of 30mm * 30mm * 5mm, at coupon surface preparation strengthened coat, carry out thermal shock test according to embodiment 1-3.Testing program is: be heated in common heat treatment furnace in the certain temperature immersion water and carry out shrend, circulating so repeatedly peeling phenomenon occurs up to coating.Wherein embodiment 1 and 2 Heating temperatures are 1100-1200 ℃, and thermal shocking can arrive more than 20 times; Embodiment 3 Heating temperatures are 850-900 ℃, and thermal shocking can reach more than 25 times.As seen embodiment 1-3 all has good thermal shock resistance properties.
Embodiment 4 and 5 is the annealing furnace roller surface peening coating of five-layer structure, and wherein the first layer (internal layer) is a bonding coat, and the second layer to the four layers (middle layers) is a tie coat, and layer 5 (skin) is the work coating.The material of each layer is as shown in the table:
| Coating | The first layer | The second layer | The 3rd layer | The 4th layer | Layer 5 |
| Embodiment 4 | Co base alloy+5%Al 2O 3+3％Cr 2O 3 | Co base alloy+15%Al 2O 3+4％Cr 2O 3 | Co base alloy+25%Al 2O 3+5％Cr 2O 3 | Co base alloy+35%Al 2O 3+6％Cr 2O 3 | Co base alloy+45%Al 2O 3+7％Cr 2O 3 |
| Embodiment 5 | Co base alloy+5%Al 2O 3+3％CrB 2+2％Cr 3C 2 | Co base alloy+15%Al 2O 3+3％CrB 2+2％Cr 3C 2 | Co base alloy+25%Al 2O 3+3％CrB 2+2％Cr 3C 2 | Co base alloy+35%Al 2O 3+3％CrB 2+2％Cr 3C 2 | Co base alloy+45%Al 2O 3+3％CrB 2+0.2％Cr 3C 2 |
Annealing furnace roller surface peening coating according to embodiment 4 and 5 preparations is five-layer structure, comprises bonding coat, three layers of tie coat and the coating of working.Stupalith is higher in the work coating, therefore has well anti-oxidant, wear-resistant and resistive connection knurl performance.And each coated material interalloy and ceramic ratio be according to graded, and promptly from inside to outside, the alloy ratio in each coating gradually reduces, and ceramic ratio progressively increases, and finally forms gradient cladding.And the gradient ratio embodiment 1-3 that forms is more, has improved the bonding properties of strengthened coat and roller sill more, and the interior coalescent performance of closing of coating inside.
Select for use the roller sill to make the coupon of 30mm * 30mm * 5mm, at coupon surface preparation strengthened coat, carry out the thermal shock test of same approach according to embodiment 4 and 5.Embodiment 4 Heating temperatures are 1100-1200 ℃, and embodiment 5 Heating temperatures are 850-900 ℃, and thermal shocking all can reach more than 30 times, and visible embodiment 4 and 5 has better thermal shock resistance properties.
To carry out the test of resistive connection knurl according to the coupon that embodiment 1-5 prepares surface peening coating, experimental program is: coupon is placed with the stove of the identical atmosphere of continuous annealing furnace be heated to thermal shock test uniform temp insulation 4 days, the coating outside surface remains with the Fe powder and contacts.Experimental result shows that embodiment 1-5 all has good high temperature resistive connection knurl performance.
The annealing furnace roller of surface peening coating produced according to the present invention has well anti-oxidant, wear-resistant and resistive connection knurl performance, and strengthened coat and roller sill have good bonding properties, can effectively prolong the work-ing life of furnace roller.
Claims (10)
1. an annealing furnace roller surface peening coating is fixed on the roller primary surface by heat spraying method, comprises bonding coat, work coating, it is characterized in that: between bonding coat and the work coating tie coat is arranged; The bonding coat material can be an alloy material, also can be to be base with the alloy, is the matrix material of additive with the pottery; Tie coat and work coating all are to be base with the alloy, and pottery is the matrix material of additive; The alloy content of bonding coat is the highest, and tie coat takes second place, and the work coating is minimum, and the ceramic content of bonding coat is minimum, and tie coat takes second place, and the work coating is the highest; Thereby formation gradient cladding.
2. a kind of annealing furnace roller surface peening coating according to claim 1, it is characterized in that: tie coat is one or more layers, tie coat is two-layer or two-layer when above, alloy content in the tie coat of upper strata is lower than lower floor's tie coat, and the ceramic content in the tie coat of upper strata is higher than lower floor's tie coat.
3. a kind of annealing furnace roller surface peening coating according to claim 1 and 2 is characterized in that: described alloy is a kind of in Co base alloy, Fe base alloy, the Ni base alloy, preferred Co base alloy.
4. a kind of annealing furnace roller surface peening coating according to claim 1 and 2 is characterized in that: pottery is an oxide compound, comprises one or more the mixing in the oxide compound of Al, Cr, Zr, Y, Si, Ca, Mg etc., preferred Al
2O
3, or Al
2O
3And Cr
2O
3Mixing.
5. a kind of annealing furnace roller surface peening coating according to claim 4 is characterized in that: surface peening coating is three layers, and the first layer is a bonding coat, and ceramic content is 0-15%wt.; The second layer is a tie coat, and ceramic content is 15-30%wt; The 3rd layer is the work coating, and ceramic content is 30%-50%wt..
6. a kind of annealing furnace roller surface peening coating according to claim 4 is characterized in that: surface peening coating is five layers, comprises three layers of tie coat, and pottery is Al
2O
3, or Al
2O
3And Cr
2O
3Mixing, wherein the first layer is a bonding coat, Al
2O
3And Cr
2O
3Content is respectively 0-10%wt. and 0-6%wt.; Second layer Al
2O
3And Cr
2O
3Content is respectively 10-20%wt. and 0-7%wt.; The 3rd layer of Al
2O
3And Cr
2O
3Content is respectively 20-30%wt. and 0-8%wt.; The 4th layer of Al
2O
3And Cr
2O
3Content is respectively 30-40%wt. and 0-9%wt.; Layer 5 is the work coating, Al
2O
3And Cr
2O
3Content is respectively 40-50%wt. and 0-10%wt..
7. a kind of annealing furnace roller surface peening coating according to claim 1 and 2, it is characterized in that: stupalith is the mixing of oxide compound, carbide and boride, and oxide compound comprises one or more the mixing in the oxide compound of Al, Cr, Zr, Y, Si, Ca, Mg etc.; Carbide comprises one or more the mixing in the carbide of Cr, Ti, Si, W, B etc.; Boride comprises one or more the mixing in the boride of Mo, Ti, Zr, Cr etc.
8. a kind of annealing furnace roller surface peening coating according to claim 7 is characterized in that: the ceramic content of bonding coat and inter coat is 0-15%wt., and the ceramic content of work coating is 15%-50%wt.; In the stupalith, carbide accounts for 0.1-20%wt., and boride accounts for 0.1-30%wt., and all the other are oxide compounds; In the stupalith of work coating, carbide accounts for 0.1-10%wt., and boride accounts for 0.1-20%wt., and all the other are oxide compounds.
9. a kind of annealing furnace roller surface peening coating according to claim 1 and 2 is characterized in that: the bonding coat material prepares at the roller primary surface with HVOF (High Velocity Oxygen Fuel) or detonation flame spraying method, forms bonding coat; The tie coat material on bonding coat, forms tie coat with flame plating, plasma spraying, HVOF (High Velocity Oxygen Fuel) or the preparation of detonation flame spraying method; The work coated material on tie coat, forms the work coating with flame plating, plasma spraying, HVOF (High Velocity Oxygen Fuel) or the preparation of detonation flame spraying method; The surface peening coating thickness of preparation is 80-200 μ m.
10. the preparation method of an annealing furnace roller surface peening coating is characterized in that may further comprise the steps:
Step 1, pair roller primary surface carry out pre-treatment;
The material of step 2, selected preparation surface peening coating comprises bonding coat, tie coat and work coated material; The bonding coat material can be an alloy material, also can be to be base with the alloy, is the matrix material of additive with the pottery; Tie coat and work coating all are base with the alloy, and alloy is a kind of in Co base alloy, Fe base alloy, the Ni base alloy; Additive is a pottery, and pottery is an oxide compound, can also be the mixing of oxide compound, carbide and boride; The alloy content of bonding coat is the highest, and tie coat takes second place, and the work coating is minimum, and the ceramic content of bonding coat is minimum, and tie coat takes second place, and the work coating is the highest; Described tie coat can be a multilayer, and the alloy material content in the tie coat of upper strata is lower than lower floor's tie coat, and the ceramic content in the tie coat of upper strata is higher than lower floor's tie coat;
Step 3, with bonding coat material HVOF (High Velocity Oxygen Fuel) or detonation flame spraying at the roller primary surface, form bonding coat;
Step 4, with the flame plating of tie coat material, plasma spraying, HVOF (High Velocity Oxygen Fuel) or detonation flame spraying on bonding coat, form tie coat;
Step 5, will work coated material flame plating, plasma spraying, HVOF (High Velocity Oxygen Fuel) or detonation flame spraying on tie coat, form the work coating;
The thickness of the surface peening coating of step 6, preparation is 80-200 μ m; The work coatingsurface is carried out grinding and/or is polished to Ra is 0.1-3 μ m, and optimum range is Ra0.1-2.5 μ m.Step 7, the furnace roller that has prepared surface peening coating is carried out postheat treatment.
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2007
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