CN104278268B - The preparation method of zinc pot roll sleeve and bushing protective coating - Google Patents
The preparation method of zinc pot roll sleeve and bushing protective coating Download PDFInfo
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- CN104278268B CN104278268B CN201310287308.4A CN201310287308A CN104278268B CN 104278268 B CN104278268 B CN 104278268B CN 201310287308 A CN201310287308 A CN 201310287308A CN 104278268 B CN104278268 B CN 104278268B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K10/00—Welding or cutting by means of a plasma
- B23K10/02—Plasma welding
- B23K10/027—Welding for purposes other than joining, e.g. build-up welding
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C19/00—Alloys based on nickel or cobalt
- C22C19/07—Alloys based on nickel or cobalt based on cobalt
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C32/00—Non-ferrous alloys containing at least 5% by weight but less than 50% by weight of oxides, carbides, borides, nitrides, silicides or other metal compounds, e.g. oxynitrides, sulfides, whether added as such or formed in situ
- C22C32/0047—Non-ferrous alloys containing at least 5% by weight but less than 50% by weight of oxides, carbides, borides, nitrides, silicides or other metal compounds, e.g. oxynitrides, sulfides, whether added as such or formed in situ with carbides, nitrides, borides or silicides as the main non-metallic constituents
- C22C32/0068—Non-ferrous alloys containing at least 5% by weight but less than 50% by weight of oxides, carbides, borides, nitrides, silicides or other metal compounds, e.g. oxynitrides, sulfides, whether added as such or formed in situ with carbides, nitrides, borides or silicides as the main non-metallic constituents only nitrides
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- Arc Welding In General (AREA)
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Abstract
The invention discloses a kind of zinc pot roll sleeve and the preparation method of bushing protective coating; i.e. axle sleeve and sleeve surface are cleaned and preheated by this method; multiple layer powder built-up welding is carried out using plasma surfacing equipment; built-up welding combination bottom selects the relatively low single cobalt-base alloys of hardness; remaining each layer built-up welding dusty material is Co-based alloy powder and boron nitride powder; plasma surfacing equipment is respectively equipped with two powder feeders for placing Co-based alloy powder and boron nitride powder; and powder feeding parameter is set respectively, realize two kinds of powder independence powder feedings；Corresponding built-up welding parameter, heap postwelding stove inside holding and furnace cooling are set, protective coating thickness is 2.0~15mm after overlay cladding is machined.The protective coating of axle sleeve and bushing is prepared through this method, effectively increases the service life of axle sleeve and bushing, improves wear-resisting and greasy property, ensure that strip smoothly passes in and out in the zinc liquid system of zinc pot, improve the production efficiency of heat zinc coating plate band.
Description
Technical field
The present invention relates to a kind of zinc pot roll sleeve and the preparation method of bushing protective coating.
Background technology
In metallurgy industry, the galvanizing by dipping that zinc pot is used for heat zinc coating plate band is handled, heat zinc coating plate band be applied to mostly automobile,
The housing of building and white goods industry, particularly all kinds of cars or household electrical appliance.
Due to being big industrial production, in large-scale continuous production process, mostly as heat zinc coating plate base material
Coiled sheet before the strip expansion of cold rolled metal reaches 40 tons, and cold rolled metal strip is through overpickling, continuous annealing, zinc pot galvanizing by dipping
Deng production treatment process and chemical treatment after crimped again.
Usual zinc pot roll shaft is made of a sinking roller and two stabilizing rollers, and wherein sinking roller is a passive slewing rollers,
Two stabilizing rollers passive clamping strip before zinc steel band goes out zinc pot, the shake for avoiding it from going out after zinc pot, the bearing portions of roller by
Axle sleeve and bushing are formed, and are realized that roll body rotates by sliding friction between the two, are realized strip in the zinc liquid system of zinc pot
Smoothly disengaging, it depends on the steady operation of the axle sleeve of zinc liquid middle roller and liner system.In liquid zinc pot corrosion, wear,
While high temperature and high mechanical force etc. act under, easily cause the damage of zinc pot roller transmission parts, its be mainly shown as axle sleeve and
The abrasion of bushing, sliding capability are deteriorated, and seriously affect the normal operation of zinc pot roller.
Chemical property based on cobalt-base alloys is insoluble in the characteristics of zinc liquid, it is used for the material for making axle sleeve and bushing,
But its physical property, which is particularly poor greasy property, cannot meet use demand, in order to increase the lubrication of axle sleeve and liner system
Performance, uses and about 0.15-0.2wt% lead is added into zinc pot to meet the requirement of axle sleeve and bushing greasy property, but easily leads
Environmental pollution is caused, therefore has been greatly reduced using this method.In modern enterprise sharply increasing with yield, strip speed
Reach 200m/min, tension force reaches 10 tons, causes the service life of original axle sleeve and bushing to be greatly lowered.Chinese patent CN
101596634A is disclosed is welded in built-up welding cobalt-base alloys making axle sleeve and bushing on stainless steel base using artificial welding rod arc, should
Method can not realize any addition of effective ceramic component, and solid box and bushing endoporus built-up welding are difficult to realize.Japan Patent
The overall heap of addition and bushing endoporus in proportion of corrosion-resistant ceramic material can be realized in JP03094984A using plasma surfacing
Weldering, but resurfacing welding material is not obviously improved the greasy property between friction pair, while the structure of overlay cladding is more single, causes work
Make performance existing defects.
The content of the invention
The technical problems to be solved by the invention are to provide the preparation method of a kind of zinc pot roll sleeve and bushing protective coating,
The protective coating of axle sleeve and bushing is prepared through this method, effectively increases the service life of axle sleeve and bushing, improve it is wear-resisting and
Greasy property, ensure that strip smoothly passes in and out in the zinc liquid system of zinc pot, improves the production efficiency of heat zinc coating plate band.
In order to solve the above technical problems, the preparation method of zinc pot roll sleeve of the present invention and bushing protective coating includes following step
Suddenly：
Step 1: axle sleeve and sleeve surface cleaning, take out stains and are preheated to 200~300 DEG C；
Step 2: multiple layer powder built-up welding, built-up welding and axle sleeve and lining are carried out to axle sleeve and bushing using plasma surfacing equipment
The bottom that set combines uses single Co-based alloy powder, and the built-up welding dusty material of remaining each layer is Co-based alloy powder and boron nitride
Powder, Co-based alloy powder component for 0.06~2.6wt%C, 8.0~32wt%Cr, 1.0~3.5wt%Si, 0.1~
18wt%W, 1.0~30wt%Mo, 0.2~3.6wt%Fe, 1.0~3.6wt%Ni, surplus Co, boron nitride powder content are
5~30wt%；
Step 3: plasma surfacing equipment is respectively equipped with two powder feedings for placing Co-based alloy powder and boron nitride powder
Device, in built-up welding two powder feeders through welding gun powder feeding or two powder feeders respectively through welding gun and external pipe powder feeding, and set respectively
Respective powder feeding parameter, realizes the respective independent powder feeding of Co-based alloy powder and boron nitride powder；
Step 4: the built-up welding parameter of plasma surfacing equipment is to spray away from 8~10mm, 60~100g/min of powder sending quantity, transfer
200~300A of arc current, 20~40V of voltage, 100~160mm/min of welding gun translational speed, adjacent welding bead overlapping area 30~
60%th, 200~300L/h of ion-gas, 800~1200L/h of protection gas, 150~250L/h of powder feeding gas, built-up welding thickness in monolayer 1.5~
2.5mm；
Step 5: 300~400 DEG C of insulation 2h and furnace cooling in axle sleeve and bushing postwelding stove；
Step 6: finished product protection coating layer thickness is 2.0~15mm after axle sleeve and bushing overlay cladding are machined.
Further, boss surfaces powder weld deposition coating is less than surface layer hardness, bushing endoporus table for two layers and bottom hardness
Face powder weld deposition coating is three layer and primer is identical with the primer of boss surfaces coating, surface layer hardness is less than or waits
In intermediate layer hardness.
It is since the preparation method of zinc pot roll sleeve of the present invention and bushing protective coating employs above-mentioned technical proposal, i.e., our
Axle sleeve and sleeve surface are cleaned and preheated by method, and multiple layer powder built-up welding, built-up welding dusty material are carried out using plasma surfacing equipment
For Co-based alloy powder and boron nitride powder, plasma surfacing equipment, which is respectively equipped with, places Co-based alloy powder and boron nitride powder
Two powder feeders, and respectively set powder feeding parameter, realize two kinds of powder independence powder feedings；Set corresponding built-up welding parameter, built-up welding
Stove inside holding and furnace cooling afterwards, protective coating thickness is 2.0~15mm after overlay cladding is machined.Axle sleeve is prepared through this method
With the protective coating of bushing, the service life of axle sleeve and bushing is effectively increased, wear-resisting and greasy property is improved, ensure that band
Steel smoothly passes in and out in the zinc liquid system of zinc pot, improves the production efficiency of heat zinc coating plate band.
Brief description of the drawings
The present invention is described in further detail with embodiment below in conjunction with the accompanying drawings：
Fig. 1 is two schematic diagrames of the powder feeder through welding gun powder feeding of built-up welding powder in this method；
Fig. 2 is two powder feeders of built-up welding powder schematic diagram through welding gun and external pipe powder feeding respectively in this method.
Embodiment
The preparation method of zinc pot roll sleeve of the present invention and bushing protective coating includes the following steps：
Step 1: axle sleeve and sleeve surface cleaning, take out stains and are preheated to 200~300 DEG C；
Step 2: multiple layer powder built-up welding, built-up welding and axle sleeve and lining are carried out to axle sleeve and bushing using plasma surfacing equipment
The bottom that set combines uses the relatively low single Co-based alloy powder of hardness, to ensure the good combination with stainless steel substrate, remaining
The built-up welding dusty material of each layer is Co-based alloy powder and boron nitride powder, and Co-based alloy powder component is 0.06~2.6wt%
C, 8.0~32wt%Cr, 1.0~3.5wt%Si, 0.1~18wt%W, 1.0~30wt%Mo, 0.2~3.6wt%Fe, 1.0
~3.6wt%Ni, surplus Co, boron nitride powder content are 5~30wt%；
Step 3: as depicted in figs. 1 and 2, plasma surfacing equipment, which is respectively equipped with, places Co-based alloy powder and boron nitride
Two powder feeders 1 of powder, two powder feeders 1 divide 1 not through welding gun 1 and outside through 2 powder feeding of welding gun or two powder feeders in built-up welding
3 powder feeding of pipeline, and respective powder feeding parameter is set respectively, realize that Co-based alloy powder and the respective of boron nitride powder are independently sent
Powder；
Step 4: the built-up welding parameter of plasma surfacing equipment is to spray away from 8~10mm, 60~100g/min of powder sending quantity, transfer
200~300A of arc current, 20~40V of voltage, 100~160mm/min of welding gun translational speed, adjacent welding bead overlapping area 30~
60%th, 200~300L/h of ion-gas, 800~1200L/h of protection gas, 150~250L/h of powder feeding gas, built-up welding thickness in monolayer 1.5~
2.5mm；
Step 5: 300~400 DEG C of insulation 2h and furnace cooling in axle sleeve and bushing postwelding stove；
Step 6: finished product protection coating layer thickness is 2.0~15mm after axle sleeve and bushing overlay cladding are machined.
Further, boss surfaces powder weld deposition coating is less than surface layer hardness, bushing endoporus table for two layers and bottom hardness
Face powder weld deposition coating is three layer and primer is identical with the primer of boss surfaces coating, surface layer hardness is less than or waits
In intermediate layer hardness.
This method bottom bracket axle and bushing base material are consistent with roll body and roll stand stainless steel material, are the stainless steels such as 316L
Material, to reduce or eliminate the stress produced during assembling and use, convenient combination between the two.Cobalt-base alloys be not according to
Strengthen by the orderly precipitated phase with matrix strong bonded, but by by the austenite face-centered cubic of solution strengthening（fcc）It is brilliant
A small amount of carbide is distributed in body structure and matrix to form, largely by carbide reinforced, pure cobalt crystal 417 DEG C with
Under be close-packed hexagonal（hcp）Crystal structure, is changed into austenite face-centered cubic at a higher temperature（fcc）Crystal structure.In order to
Avoid cobalt-base alloys that this transformation occurs when in use, actually cobalt-base alloys is by nickel alloy, so as in room temperature to fusing point temperature
Make tissue stabilization in the range of degree, while add nickel and iron to improve the solubility of carbide former in the base.
As the increase of phosphorus content, its metallographic structure became common from hypoeutectic austenite+M7C3 type eutectics in cobalt-base alloys built-up welding
Brilliant M7C3 types primary carbide and+M7C3 type eutectics.Carbon containing more, the M7C3 that comes into being is more, and macrohardness increases, wear-resistant material
Polishing machine improves, but impact resistance ability, weldability, machinability can all decline.By chromium and the cobalt-base alloys of tungsten alloy
With good inoxidizability, corrosion resistance and heat resistance, remain to keep higher hardness and strength in higher temperature in use.
Cobalt-base alloys machining rear surface is highly polished, has good anti-scuffing function, is also applied for adhesive wear.Contained with chromium and height
The cobalt-base alloys for measuring molybdenum alloy forms Laves phases, and due to the presence of Laves phases, when being free of wolfram element in alloy, hardness is still
There is raising by a relatively large margin.The presence of silicon can improve the mobile performance of metal in weld deposit process in cobalt-base alloys.In addition, cobalt-based
Content, form and the distribution of the second phase such as carbide of alloy also have an impact wearability.Due to the alloy carbide of chromium, tungsten and molybdenum
Thing is distributed in the matrix of rich cobalt and part chromium, tungsten and molybdenum atom are solid-solution in matrix, cobalt-base alloys is strengthened, so as to change
Kind wearability, and thick carbide is more advantageous to improving abrasive wear resistant weld deposit ability.
Boron nitride is the crystal being made of nitrogen-atoms and boron atom, and hexagonal boron nitride and graphite are isoelectronic specieses.It has white
The title of colored stone ink, has the layer structure of similar graphite, there is good lubricity, electrical insulating property, thermal conductivity and resistant to chemical etching
Property.Chemical property is stablized, and, good in oxidation resistance inert to all molten metal chemistry, has high heat resistance and impact resistance
Performance.Suitably make high-temperature lubricant and antifriction material.
Plasma arc powder surfacing technology has deposition rate high, dilution rate is low, built-up welding as one of material surface strengthening means
It is wide with powder use scope, it is easy to accomplish outstanding advantages of automation mechanized operation.It is applied to prepare more and more widely various resistance to
Anti-corrosion, high temperature oxidation resisting overlay is ground, often needs to add the element of some properties in the overlay of these specific uses
Or hard particles, particle and the bond matrix phase powder of these properties usually carry out mechanical mixture and carry out prepares coating, otherwise
Cost will be very high.At the same time in single powder feeder the powder of mechanical mixture since various particle specific gravity differences may be layered or is distributed
Inequality, ultimately causes and prepares the uneven of overlay performance, and stifled powder phenomenon is there is also using single powder feeder powder feeding, equipment without
Method works normally.Therefore, plasma surfacing equipment has two independent powder feeders in this method, each powder feeder connect one or
Two powder feeding ducts, it is independent to supply powder to welding gun for powder or by outside, so coordinate powder feeding to can be obtained by uniform composite coating.
Plasma surfacing equipment can configure endoporus welding gun, to complete the overall built-up welding of small-bore axle sleeve and bushing endoporus hard layer.
Built-up welding hard layer is usually made of according to use demand, axle sleeve appearance layer double-layer structure, and wherein primer contains
There is less hard phase, hardness is relatively low, and in favor of the good combination with stainless steel substrate, surface material requires hardness higher, and
Containing self-lubricating component, to reduce friction coefficient.Bushing endoporus layer is usually made of three-decker, primer and axle sleeve phase
With meet with stainless steel substrate binding ability requirement, intermediate layer material require hardness it is higher, and surface material hardness should be less than or
Equal to intermediate layer hardness.
The powder weld deposition material that this method uses is easy to flexibly allocate coating composition proportioning, is realized during bead-welding technology
In-situ preparation hard phase, optimizes the matching performance between coating structure and friction pair；The introducing of boron nitride material, possesses coating
Certain self-lubricating property, reduces friction coefficient when working between axle sleeve and bushing, elongate member service life；Plasma
Surfacing equipment, which is equipped with, independently send double powder feed systems of point function also to realize the inside and outside powder feeding at the same time of welding gun, i.e. a powder feeder carries out
Gun internal powder conveying, another powder feeder powder feeding among lateral electric arc and molten bath, this automatic powder feeding system solution outside electric arc via powder feeding pipes
Having determined, for boron nitride particle when preparing wear-resisting composite coating easily in electric arc the problem of scaling loss, matrix powder Binder Phase can be via weldering
Rifle powder feeding is subject to the abundant fusing of high-temperature electric arc, ensure that the performance of coating；Overlay-operation can carry out automatically, reduce manual heap
The interference of human factor is welded, ensure that product quality.
The built-up welding hard layer of protective coating made from this method is made of sandwich construction optimization, and overlay cladding is combined good with base material
Good, bushing endoporus hard layer is easy to process, meanwhile, frictional behaviour is mutually matched between axle sleeve and bushing, is operated steadily, it will be apparent that
Alleviate the problem of frictional resistance run into use constantly increases.
Under be classified as multiple embodiments of this method：
Embodiment 1
Axle sleeve 316L stainless steel substrates are worked into desired size and clean surface before built-up welding, are preheated to 250 DEG C in stove, bottom
Layer Co-based alloy powder component be：1.0wt%C, 29wt%Cr, 2.0wt%Si, 4.5wt%W, 1.0wt%Mo, 2.0wt%
Fe, 2.0wt%Ni, bottom powder sending quantity 80g/min.Surface layer Co-based alloy powder component is：2.0wt%C, 29wt%Cr,
2.0wt%Si, 12wt%W, 1.0wt%Mo, 2.0wt%Fe, 2.0wt%Ni, surface layer powder sending quantity 68g/min, while boron nitride
Powder uses external pipe powder feeding, powder sending quantity 20g/min.
Built-up welding parameter is：Spray is shifted arc current 240A, voltage about 28V, is rotated by translational speed 130mm/min away from 8mm
Shaft sleeve workpiece, 40% speed translation welding gun is overlapped by welding bead, and ion-gas 250L/h, protects gas 1000L/h, powder feeding gas 200L/h,
Gas is argon gas.Bottom built-up welding thickness in monolayer 2.4mm, four layer thickness 8mm of surface layer built-up welding.In postwelding stove 300 DEG C insulation 2h with
Stove slow cooling, is machined to design size.
Embodiment 2
Axle sleeve 316L stainless steel substrates are worked into desired size and clean surface before built-up welding, are preheated to 240 DEG C in stove, bottom
Layer Co-based alloy powder component be：1.4wt%C, 29wt%Cr, 2.0wt%Si, 8.5wt%W, 1.0wt%Mo, 2.0wt%
Fe, 2.0wt%Ni, bottom powder sending quantity 80g/min.Surface layer Co-based alloy powder component is：1.4wt%C, 29wt%Cr,
2.0wt%Si, 8.5wt%W, 1.0wt%Mo, 2.0wt%Fe, 2.0wt%Ni, surface layer powder sending quantity 70g/min, while boron nitride
Powder uses external pipe powder feeding, powder sending quantity 15g/min.
Built-up welding parameter is：Spray is shifted arc current 240A, voltage about 28V, is rotated by translational speed 120mm/min away from 8mm
Shaft sleeve workpiece, 50% speed translation welding gun is overlapped by welding bead, and ion-gas 250L/h, protects gas 1000L/h, powder feeding gas 200L/h,
Gas is argon gas.Bottom built-up welding thickness in monolayer 2.0mm, four layer thickness 10mm of surface layer built-up welding.In postwelding stove 300 DEG C insulation 2h with
Stove slow cooling, is machined to design size.
Embodiment 3
Axle sleeve 316L stainless steel substrates are worked into desired size and clean surface before built-up welding, are preheated to 250 DEG C in stove, bottom
Layer Co-based alloy powder component be：1.0wt%C, 29wt%Cr, 2.0wt%Si, 4.5wt%W, 1.0wt%Mo, 2.0wt%
Fe, 2.0wt%Ni, bottom powder sending quantity 68g/min.Surface layer Co-based alloy powder component is：0.08wt%C, 8.5wt%Cr,
2.6wt%Si, 29wt%Mo, 1.4wt%Fe, 1.8wt%Ni, surface layer powder sending quantity 72g/min, while boron nitride powder are using outer
Portion's pipeline powder feeding, powder sending quantity 16g/min.
Built-up welding parameter is：Spray is shifted arc current 240A, voltage about 28V, is revolved by translational speed 150mm/min away from 10mm
Turn shaft sleeve workpiece, overlap 60% speed translation welding gun by welding bead, ion-gas 250L/h, protects gas 1000L/h, powder feeding gas 200L/
H, gas are argon gas.Bottom built-up welding thickness in monolayer 1.5mm, surface layer built-up welding two layers of thickness 4mm.300 DEG C of insulation 2h in postwelding stove
Furnace cooling, is machined to design size.
Embodiment 4
Bushing 316L stainless steel substrate endoporus is worked into desired size and clean surface before built-up welding, 250 are preheated in stove
DEG C, bottom Co-based alloy powder component is：1.0wt%C, 29wt%Cr, 2.0 wt%Si, 4.5 wt%W, 1.0 wt%Mo,
2.0 wt%Fe, 2.0 wt%Ni, bottom powder sending quantity 80g/min.Surface layer Co-based alloy powder component is：1.0wt%C,
29wt%Cr, 2.0wt%Si, 4.5wt%W, 1.0wt%Mo, 2.0wt%Fe, 2.0wt%Ni, surface layer powder sending quantity 76g/min,
Boron nitride powder uses external pipe powder feeding, powder sending quantity 20g/min at the same time.
Built-up welding parameter is：Spray is shifted arc current 240A, voltage about 28V, is rotated by translational speed 120mm/min away from 8mm
Shaft sleeve workpiece, 40% speed translation welding gun is overlapped by welding bead, and ion-gas 250L/h, protects gas 1000L/h, powder feeding gas 200L/h,
Gas is argon gas.Bottom built-up welding thickness in monolayer 2.2mm, five layer thickness 12mm of surface layer built-up welding.In postwelding stove 300 DEG C insulation 2h with
Stove slow cooling, is machined to design size.
Embodiment 5
Bushing 316L stainless steel substrate endoporus is worked into desired size and clean surface before built-up welding, 250 are preheated in stove
DEG C, bottom Co-based alloy powder component is：1.0wt%C, 29wt%Cr, 2.0wt%Si, 4.5wt%W, 1.0wt%Mo,
2.0wt%Fe, 2.0wt%Ni, bottom powder sending quantity 80g/min.Intermediate layer Co-based alloy powder component is：1.5wt%C,
30wt%Cr, 2.0wt%Si, 8.5wt%W, 1.0wt%Mo, 2.0wt%Fe, 2.0wt%Ni, intermediate layer powder sending quantity 72g/
Min, while boron nitride powder uses external pipe powder feeding, powder sending quantity 15g/min.Surface layer Co-based alloy powder component is：
1.0wt%C, 29wt%Cr, 2.0wt%Si, 4.5wt%W, 1.0wt%Mo, 2.0wt%Fe, 2.0wt%Ni, surface layer powder sending quantity
76g/min, while boron nitride powder uses external pipe powder feeding, powder sending quantity 20g/min.
Built-up welding parameter is：Spray is shifted arc current 240A, voltage about 28V, is rotated by translational speed 120mm/min away from 8mm
Shaft sleeve workpiece, 40% speed translation welding gun is overlapped by welding bead, and ion-gas 250L/h, protects gas 1000L/h, powder feeding gas 200L/h,
Gas is argon gas.Bottom built-up welding thickness in monolayer 1.8mm, intermediate layer built-up welding threeply degree 8mm, surface layer built-up welding two layers of thickness 5mm.
300 DEG C of insulation 2h furnace coolings, are machined to design size in postwelding stove.
This method is by plasma surfacing equipment, to form the cobalt-based hard with self-lubricating property on stainless steel base
The mode processing and fabricating axle sleeve of alloy working lining and the protective coating of bushing, pass through Co-based alloy powder optimizing components, coating knot
Structure designs and bead-welding technology is perfect, improve friction it is secondary between matching performance, working life in zinc liquid or molten aluminum and steady
It is qualitative to greatly improve, and manufacturing process is easy, production cost is relatively low, and the market competitiveness is strong.
Claims (2)
1. the preparation method of a kind of zinc pot roll sleeve and bushing protective coating, it is characterised in that this method includes the following steps：
Step 1: axle sleeve and sleeve surface cleaning, take out stains and are preheated to 200~300 DEG C；
Step 2: multiple layer powder built-up welding, built-up welding and axle sleeve and bushing knot are carried out to axle sleeve and bushing using plasma surfacing equipment
The bottom of conjunction uses single Co-based alloy powder, and the built-up welding dusty material of remaining each layer is Co-based alloy powder and boron nitride powder
End, Co-based alloy powder component is 0.06~2.6wt%C, 8.0~32wt%Cr, 1.0~3.5wt%Si, 0.1~18wt%
W, 1.0~30wt%Mo, 0.2~3.6wt%Fe, 1.0~3.6wt%Ni, surplus Co, boron nitride powder content for 5~
30wt%；
Step 3: plasma surfacing equipment is respectively equipped with two powder feeders for placing Co-based alloy powder and boron nitride powder, heap
Two powder feeders and are set respective respectively through welding gun powder feeding or two powder feeders respectively through welding gun and external pipe powder feeding in weldering
Powder feeding parameter, realizes the respective independent powder feeding of Co-based alloy powder and boron nitride powder；
Step 4: the built-up welding parameter of plasma surfacing equipment is electric away from 8~10mm, 60~100g/min of powder sending quantity, transferred arc for spray
Flow 200~300A, 20~40V of voltage, 100~160mm/min of welding gun translational speed, adjacent welding bead overlapping area 30~60%,
200~300L/h of ion-gas, 800~1200L/h of protection gas, 150~250L/h of powder feeding gas, built-up welding thickness in monolayer 1.5~
2.5mm；
Step 5: 300~400 DEG C of insulation 2h and furnace cooling in axle sleeve and bushing postwelding stove；
Step 6: finished product protection coating layer thickness is 2.0~15mm after axle sleeve and bushing overlay cladding are machined.
2. the preparation method of zinc pot roll sleeve according to claim 1 and bushing protective coating, it is characterised in that：Axle sleeve table
Face powder weld deposition coating is less than surface layer hardness for two layers and bottom hardness, bushing bore area powder weld deposition coating be three layers simultaneously
And primer is identical with the primer of boss surfaces coating, surface layer hardness is less than or equal to intermediate layer hardness.
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