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 PDF

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Publication number
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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powder
welding
built
bushing
axle sleeve
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CN201310287308.4A
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Chinese (zh)
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CN104278268A (en
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徐建明
王树保
傅卫
王倩
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上海宝钢工业技术服务有限公司
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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B23MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23KSOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K10/00Welding or cutting by means of a plasma
    • B23K10/02Plasma welding
    • B23K10/027Welding for purposes other than joining, e.g. build-up welding
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C19/00Alloys based on nickel or cobalt
    • C22C19/07Alloys based on nickel or cobalt based on cobalt
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C32/00Non-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
    • C22C32/0047Non-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
    • C22C32/0068Non-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

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

The preparation method of zinc pot roll sleeve and bushing protective coating

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.
CN201310287308.4A 2013-07-10 2013-07-10 The preparation method of zinc pot roll sleeve and bushing protective coating CN104278268B (en)

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