CN105171269A - Iron-based wear-resistant coating and preparing method thereof - Google Patents
Iron-based wear-resistant coating and preparing method thereof Download PDFInfo
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- CN105171269A CN105171269A CN201510491492.3A CN201510491492A CN105171269A CN 105171269 A CN105171269 A CN 105171269A CN 201510491492 A CN201510491492 A CN 201510491492A CN 105171269 A CN105171269 A CN 105171269A
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- based wear
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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
- B23K35/00—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting
- B23K35/22—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by the composition or nature of the material
- B23K35/24—Selection of soldering or welding materials proper
- B23K35/30—Selection of soldering or welding materials proper with the principal constituent melting at less than 1550 degrees C
- B23K35/3053—Fe as the principal constituent
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C37/00—Cast-iron alloys
- C22C37/10—Cast-iron alloys containing aluminium or silicon
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- Manufacture Of Metal Powder And Suspensions Thereof (AREA)
- Coating By Spraying Or Casting (AREA)
Abstract
The invention discloses an iron-based wear-resistant coating and a preparing method thereof. The iron-based wear-resistant coating comprises, by atomic percent, 4.5%-9.5% of Cr, 1.8%-3.5% of Nb, 14.6%-17.5% of B, 2.9%-4.8% of C, 0.5%-0.9% of Si, 0.1%-1.1% of Mn, any one of 1.2%-3.5% of Mo, 0.5%-2.7% of Cu and 0.5%-3.0% of W, and the balance Fe. The preparing method of the iron-based wear-resistant coating comprises the steps that (1) master alloy is prepared through a vacuum induction melting method; (2) the master alloy is made into iron-based amorphous alloy powder by means of a vacuum atomization technique; (3) the iron-based amorphous alloy powder is surfaced to a steel plate with the surface being cleaned by means of a plasma surfacing method, so that the iron-based wear-resistant coating is obtained. The iron-based wear-resistant coating has the hardness and wear resistance which are better than those of an existing coating, is low in cost and can achieve industrialization easily; the preparing technique of the iron-based wear-resistant coating is simple, and cost is further reduced.
Description
Technical field
The invention belongs to field of welding material, particularly relate to a kind of iron-based wear-resistant coating and preparation method thereof.
Background technology
Non-crystaline amorphous metal has shortrange order longrange disorder, composition even tissue, there is not the features such as crystal defect, has very high intensity, toughness, well wear-resisting and corrosion resisting property.Fe-based amorphous alloy is as the important non-crystaline amorphous metal of a class, and it not only has the feature that general non-crystaline amorphous metal has, and most of Fe-based amorphous alloy also has excellent soft magnet performance, obtains a wide range of applications in magnetic material.Because iron resource stores abundant at occurring in nature, the vacuum required when preparing amorphous is lower, so the material of Fe-based amorphous alloy, preparation cost are low, is easy to the use that puts it over.But Fe-based amorphous alloy temperature-room type plasticity is poor, the difficulty of preparation large scale Fe-based amorphous alloy is comparatively large, limits its application as structural material.
The preparation method of metal coating has multiple, as thermal spraying, plasma surfacing.Compared with plasma spray technology, plasma surfacing technology has the advantages such as cost is low, bond strength is high, thermal distoftion is little, heat affected area is little, dilution rate is low, becomes the preparation technology of current most widely used wear-resisting, corrosion-resistant finishes.Mechanical part, such as, under oil drill rocker, valve, bearing etc. are often applied to comparatively harsh working condition, its surface requires wear-resisting, high temperature resistant, corrosion-resistant usually.Therefore, plasma surfacing technology has been widely used in surface peening, the melting and coating technique field of similar means part.
Vacuum aerosolization method be with the gas of rapid movement impact by metal or alloy liquid crushing for fine drop, be then condensed into the powder extraction method of pressed powder.Atomizing particle not only has the identical evening chemical composition with set molten alloy, and due to rapid solidification refinement crystalline texture, eliminate the gross segregation of second-phase.Powder size prepared by aerosolization technology is tiny, sphericity is high, oxygen content is low, has become the main method of producing high performance spherical metal and alloy powder at present.
The performance of coating and the composition of coating and microscopic structure closely related.In general, tiny coating microstructure is conducive to the raising of hardness and wearability, and toughness and crack resistance also can improve simultaneously.It is interval that non-crystaline amorphous metal has certain supercooled liquid phase, and have the ability of opposing grain growth when heat inputs, the grain structure after therefore solidifying is more tiny.
Summary of the invention
In order to solve the problems of the technologies described above, the invention provides a kind of iron-based wear-resistant coating and preparation method thereof, the main component of described iron-based wear-resistant coating is Fe-based amorphous alloy, and it has and is better than now cated hardness and wearability, and cost is low, is easy to realize industrialization; Its preparation technology is simple, again reduces cost.
For this reason, technical scheme of the present invention is as follows:
A kind of iron-based wear-resistant coating, comprises the following component according to atomic percentage (at.%):
Cr:4.5-9.5; Nb:1.8-3.5; B:14.6-17.5; C:2.9-4.8; Si:0.5-0.9; Mn:0.1-1.1; And any one in Mo:1.2-3.5, Cu:0.5-2.7 and W:0.5-3.0; Fe: surplus.
The preparation method of described iron-based wear-resistant coating, comprises the steps:
1) according to atomic percent batching, vacuum induction melting method is adopted to prepare foundry alloy;
2) described foundry alloy is put into vacuum atomizing stove, utilize vacuum aerosolization technology to prepare Fe-based amorphous alloy powder;
3) utilize plasma surfacing method by described Fe-based amorphous alloy powder weld deposition to surface on the steel plate of cleaning, obtain iron-based wear-resistant coating.
The technological parameter of described plasma surfacing is: voltage: 26-28V, electric current: 160-200A, speed of welding: 35-40mm/min, shielding gas flow speed: 10-12L/min, powder feed rate: 15-20g/min, amplitude of fluctuation: 20 ~ 30mm.
In the material composition of iron-base amorphous alloy material of the present invention, B, C are metalloid elements, and except reducing except the critical cooling rate of non-crystaline amorphous metal, Main Function forms non-crystaline amorphous metal, and B, C are important wear-resisting phase forming elements; Si, Mn have combined deoxidation and solution strengthening effect, can reduce fusing point, improve molten metal flow, improve amorphous formation ability; Cr, Nb, Mo, W can improve the stress of the amorphous formation ability of non-crystaline amorphous metal, antioxygenic property and release amorphous alloy strips, are also carbides simultaneously; Cu can impel the fusion of each component more abundant, improves toughness.
Compared with prior art, tool of the present invention has the following advantages:
1. the invention provides a kind of Fe-based amorphous forming component newly, this composition contains more wear-resisting phase element Cr, Nb, Mo; And nonmetalloid C, B, Si make alloy have good amorphous formation ability and high rigidity; This cost of alloy is lower, is easy to realize suitability for industrialized production.
2. present invention employs a kind of plasma surfacing technique of routine to prepare alloy coat, technique is simple, greatly reduces preparation cost.
3. the iron-based wear-resistant coating that the present invention obtains has very high hardness and wearability, has great application prospect in fields such as oil drill rocker, valve, bearings.
Accompanying drawing explanation
Fig. 1 is ESEM (SEM) the microscopic appearance figure of the Fe-based amorphous alloy powder that embodiment 1 obtains;
Fig. 2 is the X-ray diffractogram of coating prepared by the Fe-based amorphous alloy powder that obtains of embodiment 1 and plasma surfacing.
Detailed description of the invention
Below in conjunction with embodiment and accompanying drawing, technical scheme of the present invention is described in detail.
The preparation method of Fe-based amorphous alloy powder and plasma surfacing method in each embodiment, as described below:
1, first the pure Fe of industrial use, Cu, Si, Mn and industrial Cr-C, Fe-Nb, Fe-Mo, Fe-W, Fe-B alloy are mixed with raw material according to required weight ratio.Then the raw metal prepared is melted in vaccum sensitive stove, after refining, molten metal liquid is poured in insulation crucible, and enters mozzle and nozzle, now melt stream be atomized by high-pressure gas flow.Metal dust after atomization carries out solidifying in atomisation tower, sedimentation, falls into and receives powder tank.
2, AISI4137H steel plate selected by the base material of plasma surfacing, is of a size of 200mm × 150mm × 15mm.First surface of steel plate oxide layer grinding machine is ground off before built-up welding, then deoil with acetone cleaning, clean and dry up by alcohol wipe.In order to reduce or eliminate the generation that welding stress causes weld overlay cracking, before built-up welding, base material is put into the fully preheating of 200-250 DEG C of heating furnace, and postwelding wraps up slow cooling to room temperature with insulation blanket immediately.Plasma surfacing processing parameter setting is: voltage: 26-28V, electric current: 160-200A, speed of welding: 35-40mm/min, shielding gas flow speed: 10-12L/min, powder feed rate: 15-20g/min, amplitude of fluctuation: 20mm-30mm.
Embodiment 1
Utilize the method for vacuum induction melting to prepare and be configured to Fe
66.7cr
5.2mo
3.3nb
3.1b
16.7c
3.3si
0.8mn
0.9(at.%) Fe-based amorphous alloy foundry alloy, is then utilized vacuum aerosolization technology to obtain Fe-based amorphous alloy powder;
Utilize plasma surfacing method by described Fe-based amorphous alloy powder weld deposition to surface on the AISI4137H steel plate of cleaning, obtain iron-based wear-resistant coating; Wherein the preheat temperature of AISI4137H steel plate is 200 DEG C, and preheating time is 1.5 hours; Employing plasma surfacing technique design parameter is: voltage 26V, electric current 180A, speed of welding 35mm/min, shielding gas flow speed is 10L/min, and powder feed rate is 15g/min, and amplitude of fluctuation is 25mm.Wrap up slow cooling to room temperature with insulation blanket immediately after built-up welding completes, coating surface does not have macroscopic crackle, well shaping.
Embodiment 2
Utilize the method for vacuum induction melting to prepare and be configured to Fe
63.5cr
8.5cu
2nb
3.1b
17.3c
4.4si
0.7mn
0.5(at.%) Fe-based amorphous alloy foundry alloy, is then utilized vacuum aerosolization technology to obtain Fe-based amorphous alloy powder; The Fe-based amorphous alloy powder obtained.
Utilize plasma surfacing method by described Fe-based amorphous alloy powder weld deposition to surface on the AISI4137H steel plate of cleaning, obtain iron-based wear-resistant coating; Wherein the preheat temperature of AISI4137H steel plate is 220 DEG C, and preheating time is 1.5 hours; Employing plasma surfacing technique design parameter is: voltage 26V, electric current 160A, speed of welding 35mm/min, shielding gas flow speed is 12L/min, and powder feed rate is 18g/min, and amplitude of fluctuation is 25mm.Wrap up slow cooling to room temperature with insulation blanket immediately after built-up welding completes, coating surface does not have macroscopic crackle, well shaping.
Embodiment 3
Utilize the method for vacuum induction melting to prepare and be configured to Fe
66.7cr
6.5w
2nb
2.5b
17.3c
4.2si
0.7mn
0.1(at.%) Fe-based amorphous alloy foundry alloy, is then utilized vacuum aerosolization technology to obtain Fe-based amorphous alloy powder; The Fe-based amorphous alloy powder obtained.
Utilize plasma surfacing method by described Fe-based amorphous alloy powder weld deposition to surface on the AISI4137H steel plate of cleaning, obtain iron-based wear-resistant coating; Wherein the preheat temperature of AISI4137H steel plate is 250 DEG C, and preheating time is 1.5 hours; Employing plasma surfacing technique design parameter is: voltage 28V, electric current 200A, speed of welding 40mm/min, shielding gas flow speed is 12L/min, and powder feed rate is 20g/min, and amplitude of fluctuation is 25mm.Wrap up slow cooling to room temperature with insulation blanket immediately after built-up welding completes, coating surface does not have macroscopic crackle, well shaping.
Institutional framework, hardness, wearability experiment are carried out to the Fe-based amorphous alloy wear-resistant coating that embodiment obtains, utilize BRUKERD8FOCUS (Cu-K α, λ=0.15406nm) X-ray diffractometer is to amorphous powder and pile sign and the detection that welding coat carries out institutional framework, and test result is as shown in table 1.Adopt HR-150A type Rockwell apparatus to get to overlay cladding at 5 and measure the average Rockwell hardness that hardness obtains this overlay cladding, load is 150Kg.MLS-225 type damp sand rubber wheel grain-abrasion testing machine is adopted to carry out wearability experiment to overlay cladding test specimen, Wear specimens is of a size of 57mm × 25.5mm × 6mm, experiment parameter is as follows: rubber wheel rotating speed: 240 revs/min, rubber wheel diameter: 178mm, rubber wheel hardness: 60 (Shao Er hardness), load: 10Kg, rubber wheel revolution: pre-grinding 1000 turns, fine grinding 4000 turns, abrasive material: granularity 40-70 order quartz sand.The weight loss of material relative wear performance wearing and tearing is weighed.On pretreatment, after, test specimen is put into the beaker filling acetone soln, in ultrasonic washing instrument, cleans 3-5 minute.Experiment adopts Fe50 powder as a comparison, and the ratio of contrast piece weight loss and measuring piece weight loss is as the relative wear resistance of this composition.
As shown in Figure 1, as can be seen from the figure, the sphericity of powder is very good, has good mobility, is suitable for plasma surfacing for the shape appearance figure of the Fe-based amorphous alloy powder that embodiment 1 obtains.As shown in Figure 2, powder (75 ~ 150 microns) major part is amorphous state to the X-ray diffractogram of the Fe-based amorphous alloy powder that embodiment 1 obtains.The X-ray diffractogram of the iron-based wear-resistant coating that embodiment 1 obtains shows (as shown in Figure 2), containing NbC and Fe in coating
2the institutional framework of B hard phase and α-Fe, wherein the Vickers hardness of NbC reaches 2400HV, Fe
2the Vickers hardness of B is 1600HV, and the existence of these hard phases serves invigoration effect to coating.
Table 1 lists the hardness of embodiment 1-3 coating and comparative example, wear weight loss amount and relative wear resistance, and the hardness of coating is all greater than comparative example, and relative wear resistance is about 2 times of comparative example.
The hardness of table 1 embodiment 1-3 and comparative example Fe50 overlay cladding, wear weight loss amount and relative wear resistance
Claims (3)
1. an iron-based wear-resistant coating, is characterized in that comprising the following component according to atomic percentage:
Cr:4.5-9.5; Nb:1.8-3.5; B:14.6-17.5; C:2.9-4.8; Si:0.5-0.9; Mn:0.1-1.1; And any one in Mo:1.2-3.5, Cu:0.5-2.7 and W:0.5-3.0; Fe: surplus.
2. the preparation method of iron-based wear-resistant coating as claimed in claim 1, is characterized in that comprising the steps:
1) according to atomic percent batching, vacuum induction melting method is adopted to prepare foundry alloy;
2) described foundry alloy is put into vacuum atomizing stove, utilize vacuum aerosolization technology to prepare Fe-based amorphous alloy powder;
3) utilize plasma surfacing method by described Fe-based amorphous alloy powder weld deposition to surface on the steel plate of cleaning, obtain iron-based wear-resistant coating.
3. preparation method as claimed in claim 2; it is characterized in that: the technological parameter of described plasma surfacing is: voltage: 26-28V; electric current: 160-200A; speed of welding: 35-40mm/min; shielding gas flow speed: 10-12L/min; powder feed rate: 15-20g/min, amplitude of fluctuation: 20 ~ 30mm.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105861947A (en) * | 2016-06-02 | 2016-08-17 | 芜湖三刀材料科技有限公司 | Novel metal surface composite material and preparation method |
| CN107297586A (en) * | 2017-06-13 | 2017-10-27 | 哈尔滨工业大学深圳研究生院 | For Area array packages cu-base amorphous alloy soldered ball and preparation method thereof and method for packing |
| CN110484851A (en) * | 2019-07-30 | 2019-11-22 | 上海涟屹轴承科技有限公司 | A kind of Novel sliding bearing anti-friction wear-resistant sprayed on material and preparation method thereof |
| CN114000088A (en) * | 2021-11-05 | 2022-02-01 | 华电重工股份有限公司 | Coating for field protection of water wall pipe of power station boiler and preparation method thereof |
| CN115172033A (en) * | 2022-06-16 | 2022-10-11 | 江苏科技大学 | Surface protection method of neodymium iron boron magnet |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110484851A (en) * | 2019-07-30 | 2019-11-22 | 上海涟屹轴承科技有限公司 | A kind of Novel sliding bearing anti-friction wear-resistant sprayed on material and preparation method thereof |
| CN114000088A (en) * | 2021-11-05 | 2022-02-01 | 华电重工股份有限公司 | Coating for field protection of water wall pipe of power station boiler and preparation method thereof |
| CN115172033A (en) * | 2022-06-16 | 2022-10-11 | 江苏科技大学 | Surface protection method of neodymium iron boron magnet |
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Application publication date: 20151223 |