CN105063539A - Method for preparing wear-resistant coating of ball mill lining plate - Google Patents
Method for preparing wear-resistant coating of ball mill lining plate Download PDFInfo
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Abstract
The invention discloses a method for preparing a wear-resistant coating of a ball mill lining plate, and belongs to the field of remanufacturing of engineering machines. The wear-resistant coating comprises a base and a coating layer. The base comprises, by weight, 0.30%-0.44% of C, 1.50%-2.0% of Si, 0.8%-1.40% of Mn, 2.0%-2.8% of Cr, equal to or less than 0.3% of Mo, equal to or less than 0.3% of Ni, 0.02% of Re, 0.04% of P and S, and the balance Fe. The coating layer comprises, by volume fraction, 95%-98% of WC-Co powder and 2%-5% of Cr. The weight ratio of Cr to Co is 0.2-0.5. The method enables a part to have wear resistance, corrosion resistance and other special performance, the reliability of the part is improved, the service life of the part is prolonged, and especially the wear resistance of the working surface of the ball mill lining plate is improved.
Description
Technical field
The invention belongs to engineering machinery re-manufacturing technology field, more particularly, relate to a kind of preparation method of ball grinding machine lining board wear-resistant coating.
Background technology
Material is one of basic substance of human survival and development.Society is using reducing the loss of material as a very important problem.The inefficacy great majority of mechanical component are from surface, and the surface strength of material directly affects the work-ing life of mechanical component.According to incompletely statistics, the financial loss that causes because of frictional wear every year of all kinds of component of machine in the whole world is up to hundreds billion of dollar.Because frictional wear occurs in material surface, therefore adopt advanced sufacing, preparing required wear-resistant coating in the design of common material surface optimization is a kind of simple and effective method.It not only can significantly improve reliability and the work-ing life of product, and reduce maintenance and the replacing of product, and save material and the energy, being conducive to environment protection, is one of developing direction of Materials science.
The coating making the material surfaces such as steel obtain high abrasion ability by surface metallurgic strengthening is raising part work-ing life, the important means of saving steel and precious alloy material.Therefore, the development of material surface new technology particularly coating technology is more and more fast in the last few years.At present, research mainly concentrates in the wear-and corrosion-resistant coating such as Ni base, Co base, Fe base of the technology acquisitions such as thermospray, plasma spraying, detonation flame spraying or laser cladding, but have its limitation technique, as poor in hot spray-welding coating process, coating quality is low; Laser cladding equipment used is expensive, and laser power is little; Plasma spraying, detonation flame spraying noise pollution, equipment is complicated, and manufacturability is unstable, thus, is subject to certain restrictions in engineer applied.Therefore, adopt a kind of new method to prepare extensive attention that Wear-resistant corrosion-resistant coating obtains people.
Hypersonic flame spraying, is also called HVOF (High Velocity Oxygen Fuel)
[23-24], it is the spray gun utilizing particular design, makes the powder particle of spraying be ejected into high speed a kind of hot-spraying techniques that workpiece surface forms bonding strength and all high coating of density.The feature of hypersonic flame spraying is summarized as follows several aspect:
(1) flight velocity of powder particle is high, can reach more than twice velocity of sound, and because impact energy is large, the structure comparison of deposited coatings is fine and close, bonding strength is high and occur without demixing phenomenon;
(2) flame temperature is relatively not high, and particle residence time in flame is relatively short, makes the phase transformation of material, oxidation Sum decomposition is effectively suppressed, be therefore particularly suitable for spraying the material at high temperature very easily decomposing and degenerate as WC etc.;
(3) spray distance can adjust flexibly under the prerequisite not affecting coating quality;
(4) unrelieved stress of coating is stress and less, and therefore coating has good fatigue strength;
(5) excellent combination property: coating porosity is lower, hardness is higher, and wear resisting property is stronger, and work-ing life significantly improves.
The remarkable advantage of hypersonic flame spraying is that facility investment is supported, and sedimentation velocity is fast, and material selection range is large.Hypersonic flame spraying has excellent low-temperature and high-speed characteristic in addition, and this is particularly suitable for spraying abrasion-proof WC class of good performance material.
For the large-size ball mill that the fragmentation of iron ore, grinding and ore dressing etc. use, it mainly destroys with fatigue wear and lost efficacy.This is because abrading-ball in ball mill and iron ore all very matter is close and hard, wherein material Mohs' hardness is 5.5-6.5, the liner plate paid for first to inner barrel in operation process brings larger impact and frictional force, also can be subject to the impact of operating environment and the inefficacy that is corroded simultaneously, just lost efficacy because of excessive wear after usual use about 4-5 month, even ruptured because of excessive wear.Therefore, the work-ing life of ball grinding machine lining board is shorter.In order to make ball mill wearing liner plate can meet high service requirements under the Working environment of such harshness, there is work-ing life more of a specified duration, industrial production using maximum processing methodes be that material that selectivity is higher is to produce large-scale ball grinding machine lining board
[1-4].But the chemical composition redesigning body material is a veryer long process to producing that actual production puts into practice.
The invention provides a kind of preparation method of ball grinding machine lining board wear-resistant coating.First adopt metallic substance PANDAT thermodynamic software to carry out simulation and determine body material; Secondly, from re-manufacturing technology technique
[5-6]aspect is considered, hypersonic flame spraying technology is used to prepare WC-10Co-xCr (x=2 at substrate material surface, 3,4,5) ceramic coating, thus give the properties such as part is wear-resisting, anti-corrosion, improve the reliability of part and extend the work-ing life of part, especially the wear resistance of ball mill wearing liner plate working face, is with a wide range of applications.
Summary of the invention
The problem solved
For the above-mentioned problems in the prior art, the invention provides a kind of preparation method of ball grinding machine lining board wear-resistant coating, with middle carbon alloy wear resisting steel (ZG42SiMnCr2MoRe steel) for body material, with WC-Co base ceramic material for spray material, hypersonic flame spraying technology is adopted to prepare WC-Co base ceramic coating, systematic study also provides a kind of high rigidity, and wear-resistant, corrosion-resistant ball grinding machine lining board manufactures Surface coating parts again.
Technical scheme
In order to solve the problem, the technical solution adopted in the present invention is as follows:
A preparation method for ball grinding machine lining board wear-resistant coating, is characterized in that, its step is as follows:
A, surface prepare: first will carry out surface alcohol or acetone cleaning wipe oil to base material, then carry out sandblasting roughening treatment to substrate surface to be sprayed;
B, thermal pretreatment: before spraying, carry out thermal pretreatment to substrate surface, preheating temperature is 200 ~ 300 DEG C, and the time is 60S;
C, spraying prime coat: utilize hypersonic flame spraying technology by mix and coat powder at 200 DEG C after dry 2 hours sprays to substrate surface the prime coat that a layer thickness is 80um;
D, spray coating operations layer: utilize hypersonic flame spraying technology by mix and coat powder at 200 DEG C after dry 2 hours is 250 μm ~ 300 μm in described step c, the spraying of gained piece surface is thick, be preferably potter's making coatings of 300um;
E, drying treatment: by steps d after spray coating operations layer coated part be placed in loft drier with 100 DEG C at dry 1 hour;
F, sealing treatment: use encapsulant to carry out sealing treatment to the hole of coat;
G, High temperature diffusion process: the coated part in step f after sealing treatment is placed in continuous hydrogen sintering furnace in 500-800 DEG C of sintering 40-60min, comes out of the stove after cooling and obtain having the ball grinding machine lining board of coat.
Further, the mass percent of described substrate composition is C0.30 ~ 0.44wt%, Si1.50 ~ 2.0wt%, Mn0.8 ~ 1.40wt%, Cr2.0 ~ 2.8wt%, Mo≤0.3wt%, Ni≤0.3wt%, Re0.02wt%, P and S 0.04wt% altogether, and all the other are Fe; It is the weight ratio of the WC-Co powder of 95 ~ 98% and the Cr of 2 ~ 5%, described Cr/Co is 0.2 ~ 0.5 that described coat powder contains volume fraction, is preferably 0.3 ~ 0.4; The even discrete distribution of described WC-Co powder in the coating.
Further, described WC-Co powder is WC-10Co powder, and metal Co is coated with WC particle, surface irregularity porous, and described WC-10Co powder is particle diameter is the spherical or subsphaeroidal powdered alloys of 300 objects.
Further, in described coat, the weight ratio of Cr/Co is 0.3 ~ 0.4.
Further, described coat homogeneous microstructure, densification, its porosity is 1 ~ 5%, and its average microhardness is 61.4 ~ 70HRC.
Further, the bonding strength of described coating piece coat is all higher than 70MPa.
Further, the corrosion potential of described substrate in the NaCl solution of 3.5wt% is-0.618V, and corrosion current density is 4.247 × 10
-4a × cm
-2; The corrosion potential of described coat in the NaCl solution of 3.5wt% is that between-0.550 ~-0.460V, corrosion current density is 3.548 × 10
-4~ 1.703 × 10
-4a × cm
-2between.
Further, hypersonic flame spraying technology is utilized to spray potter's making coatings of thick 300 μm in steps d.
Further, described supersonic flame hot-spraying techniques: preheating before spraying, the hydrocarbon of propane is utilized to be combustion gas, oxygen pressure is 1.15Mpa, propane flammable gas pressure is 0.45Mpa, and powder feeding gas flow is 4L/min, and nozzle diameter is 1mm, spray distance is 200mm, uses pressure-air cooling after spray.
Beneficial effect
Compared to prior art, beneficial effect of the present invention is:
(1) the present invention adopts hypersonic flame spraying technology to prepare WC-Co base ceramic coating, and its facility investment is supported, and sedimentation velocity is fast, and material selection range is large, and the bonding strength of coating and matrix is very high;
(2) in employing of the present invention, carbon alloy wear-resisting steel liner plate is base material, and it is organized as martensite+eutectic carbides+secondary diffusion carbide+a small amount of retained austenite; Hardness is higher than 55HRC, and toughness is higher than 42J/cm2(Xia Shi non-notch sample);
(3) WC-10Co-xCr (x=2 for preparing of the present invention, 4,5) ceramic composite particle size distribution is even, and powder is spherical in shape, and particle sphericity is high, spherical surface porous, be easy to form high quality dense coating, and its coating structure is even, fine and close, there is no larger hole, also do not occur crackle, and coating is mainly combined in the mode of mechanical engagement with body material;
(4) WC-10Co-xCr (x=2,3,4, the 5) coating porosity prepared by thermospray of the present invention is lower, and the porosity of WC-10Co-3Cr coating is 1.0%;
(5) WC-10Co-2Cr coating average microhardness of the present invention is 61.4 ~ 70HRC, and four kinds of coating microhardness are all higher than the microhardness 55.7HRC of body material;
(6) the coating piece bonding strength prepared of the present invention's four kinds of spray material is all higher, and all higher than the bonding strength of assembly glue, bonding strength all reaches 70MPa;
(7) WC-10Co-xCr of the present invention (x=2,3,4,5) coating has excellent corrosion resistance nature, and coating embodies the characteristic of ceramic coating and low porosity on the whole.Wherein, WC-10Co-3Cr coating has better corrosion resistance nature than other three kinds of coatings, and its corrosion potential is maximum, is about-0.460V, and corrosion current density is minimum, is about 1.703 × 10
-4a × cm
-2.
Accompanying drawing explanation
Fig. 1 is the micro-organization chart of carbon alloy wear resisting steel in the present invention, and wherein a is the metallographic microstructure (× 500) of middle carbon alloy wear resisting steel, and b is the scanning electron microscope microstructure (× 10 μm) of middle carbon alloy wear resisting steel;
Fig. 2 is the sectional view of WC-10Co-2Cr coating of the present invention, and wherein a is the coating cross sections figure of WC-10Co-2Cr coating under amplification 2000 times, b is the coating cross sections figure of WC-10Co-2Cr coating under amplification 5000 times;
Fig. 3 is the sectional view of WC-10Co-3Cr coating of the present invention, and wherein a is the coating cross sections figure of WC-10Co-3Cr coating under amplification 2000 times, b is the coating cross sections figure of WC-10Co-3Cr coating under amplification 5000 times;
Fig. 4 is the sectional view of WC-10Co-4Cr coating of the present invention, and wherein a is the coating cross sections figure of WC-10Co-4Cr coating under amplification 2000 times, b is the coating cross sections figure of WC-10Co-4Cr coating under amplification 5000 times;
Fig. 5 is the sectional view of WC-10Co-5Cr coating of the present invention, and wherein a is the coating cross sections figure of WC-10Co-5Cr coating under amplification 2000 times, b is the coating cross sections figure of WC-10Co-5Cr coating under amplification 5000 times;
Fig. 6 is the surface topography map of WC-10Co-2Cr coating of the present invention, and wherein a is the surface topography map of WC-10Co-2Cr coating under amplification 2000 times, and b is the surface topography map of WC-10Co-2Cr coating under amplification 15000 times;
Fig. 7 is the surface topography map of WC-10Co-3Cr coating of the present invention, and wherein a is the surface topography map of WC-10Co-3Cr coating under amplification 2000 times, and b is the surface topography map of WC-10Co-3Cr coating under amplification 15000 times;
Fig. 8 is the surface topography map of WC-10Co-4Cr coating of the present invention, and wherein a is the surface topography map of WC-10Co-4Cr coating under amplification 2000 times, and b is the surface topography map of WC-10Co-4Cr coating under amplification 15000 times;
Fig. 9 is the surface topography map of WC-10Co-5Cr coating of the present invention, and wherein a is the surface topography map of WC-10Co-5Cr coating under amplification 2000 times, and b is the surface topography map of WC-10Co-5Cr coating under amplification 15000 times.
Embodiment
Be described further the present invention below in conjunction with specific embodiment, following examples can make those skilled in the art more fully understand the present invention, but do not limit the present invention in any way.
The selection of base material:
Consider the factor affecting metallic substance performance, this can be divided into two aspects: internal cause and external cause.Internal cause refers to the chemical composition of ball grinding machine lining board itself; External cause refers to the complete processing of material.First the performance of metallic substance depends on its internal organizational structure, and internal organizational structure depends on chemical composition and fabrication process condition.At factor in mainly considering when selecting base material, i.e. the chemical composition of material.The present invention uses metallic substance PANDAT thermomechanical analysis software to simulate, and determines carbon alloy wear resisting steel in selection, is the body material of ZG42SiMnCr2MoRe steel as ball grinding machine lining board of the present invention.Its chemical composition is in table 1, and mechanical property is in table 2, and microstructure is shown in Fig. 1.
According to tissue observable under metallographic microstructure in Fig. 1 and scanning electron microscope, can obtain, ZG42SiMnCr2MoRe steel be organized as martensite+eutectic carbides+secondary diffusion carbide+a small amount of retained austenite.Thus, the interalloy martensite wear resistant steel (ZG42SiMnCr2MoRe) with this tissue has high rigidity, high tenacity and good wear resistance.Because it has good wear resistance, put into practice use and show, its work-ing life is relatively long, is the reliable material making large-size ball mill liner plate.
The selection of spray material:
As the starting material of preparation coating, the final performance of selection on preparation technology of coating and coating of dusty spray has direct impact.Spray material selected by the present invention follows following standard:
(1) thermal expansivity of the spray material selected and matrix are close as far as possible, and this can be avoided making coating produce larger string stress because difference of thermal expansion coefficients is excessive, causes the cracking of spray-on coating and comes off;
(2) the spray material size selected by is applicable to spraying, and even particle size distribution;
(3) in order to ensure mobility and the stability of powdered material conveying in spraying process, and powdered material is fully melted in flame flow, requires that the powdered material nodularization of selecting is shaped.
What the present invention prepared that WC-Co coating selects is that Co wraps up WC powder.It utilizes chemistry and metallurgical method by coated for Co WC particle, a kind of composite ceramic powder material be prepared into.This powdered material decreases the possibility of oxidation and decarbonization when spraying, and improves the compactness of coating, makes coating homogeneous.The dusty spray material that this patent adopts is the particle diameter that Xingtai Bo Xin wear resistant alloy material company limited produces is 300 order spherical WC-Co base (WC-10Co-xCr, x=2,3,4,5) powdered alloy.
Material therefor of the present invention is as shown in table 3.
embodiment 1
A kind of ball grinding machine lining board wear-resistant coating, comprise substrate and coat, the mass percent of described substrate composition is C0.30 ~ 0.44wt%, Si1.50 ~ 2.0wt%, Mn0.8 ~ 1.40wt%, Cr2.0 ~ 2.8wt%, Mo≤0.3wt%, Ni≤0.3wt%, Re0.02wt%, P and S 0.04wt% altogether, and all the other are Fe; It is the weight ratio of the WC-Co powder of 97% and the Cr of 3%, described Cr/Co is 0.3 that described coat contains volume fraction; The even discrete distribution of described WC-Co powder in the coating.
A preparation method for ball grinding machine lining board wear-resistant coating, its step is as follows:
A, surface prepare: first will carry out surface alcohol or acetone cleaning wipe oil to base material, then treat sprayed surface and carry out sandblasting roughening treatment;
B, thermal pretreatment: before spraying, thermal pretreatment is carried out to substrate surface, preheating temperature is 200 ~ 300 DEG C, time is 60S, the temperature head because of coating and substrate surface can be reduced and produce internal stress, prevent the cracking of coating and peel off, also been removed the moisture of workpiece surface simultaneously, accelerate the distortion of melting subparticle, improve deposition;
C, spraying prime coat: utilize hypersonic flame spraying technology by mix and coat powder at 200 DEG C after dry 2 hours sprays to substrate surface the prime coat that a layer thickness is 80um, improve the bonding strength of coating and matrix further;
D, spray coating operations layer: utilize hypersonic flame spraying technology by mix and coat powder at 200 DEG C after dry 2 hours is 250 μm ~ 300 μm in described step c, the spraying of gained piece surface is thick, be preferably potter's making coatings of 300um;
E, drying treatment: by steps d after spray coating operations layer coated part be placed in loft drier with 100 DEG C at dry 1 hour;
F, sealing treatment: use encapsulant to carry out sealing treatment to the hole of coat;
G, High temperature diffusion process: the coated part through sealing treatment in step f is placed in continuous hydrogen sintering furnace in 500-800 DEG C of sintering 40-60min.Come out of the stove after cooling and obtain having the ball grinding machine lining board of coat, the spread coefficient of coating constituent element can be improved, improve bonding strength and the barrier propterty of coating.
Described supersonic flame hot-spraying techniques: preheating before spraying, utilize the hydrocarbon of propane to be combustion gas, oxygen pressure is 1.15Mpa, propane flammable gas pressure is 0.45Mpa, and powder feeding gas flow is 4L/min, and nozzle diameter is 1mm, spray distance is 200mm, uses pressure-air cooling after spray.
embodiment 2
Adopt embodiment 1 method to react, its difference is:
1. a ball grinding machine lining board wear-resistant coating, it be the weight ratio of the WC-Co powder of 98% and the Cr of 2%, described Cr/Co is 0.2 that described coat contains volume fraction; The even discrete distribution of described WC-Co powder in the coating.
2., in steps d, utilize hypersonic flame spraying technology to mix the piece surface spraying thick potter making coatings for 250um of powder to spraying prime coat of coat; All the other are with embodiment 1.
Compare with embodiment 1, because Cr element is less, the decarburization of WC is oxidized can not be totally constrained, and the porosity of the coating therefore obtained is relatively high, reaches 4.4%.Cr is erosion resistance element, and the existence of Cr element has greatly impelled the formation of passive film, and the reduction of Cr element causes the corrosion potential of WC-10Co-2Cr in the NaCl solution of 3.5wt% to be reduced to-0.474V, and corrosion current density is increased to 3.548 × 10
-4a × cm
-2.But its hardness is relatively high, reaches 70HRC.
embodiment 3
Adopt embodiment 1 method to react, its difference is:
1. a preparation method for ball grinding machine lining board wear-resistant coating, it be the weight ratio of the WC-Co powder of 96% and the Cr of 4%, described Cr/Co is 0.4 that described coat contains volume fraction; The even discrete distribution of described WC-Co powder in the coating.
2., in steps d, utilize hypersonic flame spraying technology to mix the piece surface spraying thick potter making coatings for 275um of powder to spraying prime coat of coat; All the other are with embodiment 1.
embodiment 4
Adopt embodiment 1 method to react, its difference is:
1. a preparation method for ball grinding machine lining board wear-resistant coating, it be the weight ratio of the WC-Co powder of 95% and the Cr of 5%, described Cr/Co is 0.5 that described coat contains volume fraction; The even discrete distribution of described WC-Co powder in the coating.
2., in steps d, utilize hypersonic flame spraying technology to mix the piece surface spraying thick potter making coatings for 275um of powder to spraying prime coat of coat; All the other are with embodiment 1.
Can analyze according to Fig. 2-5 and obtain: four kinds of ceramic coating coating piece tissue bond are good, even, fine and close, substantially not observe obvious hole, loose and crackle existence.This illustrates and presents uneven through the basal body interface of sandblasting, and spray-on coating is then formed with mechanical snap form with matrix and combines closely, so junction combines closely, finds space and loosens.In addition, this and hypersonic flame spraying technique are undivided, and it is large that hypersonic flame spraying technology has jet speed, the feature that powder deposition speed is fast, and this just makes the collision deformation of powder and matrix abundant, and between particle and particle, overlap joint closely.Meanwhile, higher flying speed of partcles reduces the duration of contact of the oxygen in itself and air, thus it is low to obtain oxygen level, and tissue bond is coating closely.
Can find out that WC-10Co-2Cr, WC-10Co-3Cr, WC-10Co-4Cr and WC-10Co-5Cr powder particle is spraying to after on body material according to Fig. 6-9, major part particle is fully deformed into flats and is deposited on matrix surface, in fungating type, this phenomenon shows in the spraying process in early stage, powder particle is abundant melting in supersonic flame stream, there is good deformability and the ability of blind, and keying action between variable grain is good, the coating uniform formed is fine and close, and different bonding force between layers promotes.And carefully analyze the typical structure of this equal tool rapid solidification structure of four kinds of coating microstructures, namely in coating structure, there is fractional saturation sosoloid, as crystal grain is tiny, carbide decomposes the generation etc. reducing metastable phase.These tissue signatures all can ensure the good characteristic of the chemistry of coating, physics and mechanics.When in coating, sosoloid content is higher, material hardness and wear resisting property are improved; And tiny non-segregated structure also can make strength of coating raise.In addition, hypersonic flame spraying technology spraying particle flight velocity and temperature higher, coating particle distortion more abundant, also make coating have better density.
Can also obtain from table 4: (1) matrix numerically presents a variation tendency increased progressively to the microhardness of coating again to transition layer; (2) microhardness of WC-10Co-2Cr is the highest, vickers hardness hv reaches 1055, be converted into Rockwell hardness and reach 70, the microhardness value of WC-10Co-3Cr and WC-10Co-5Cr coating piece coating is more or less the same, Rockwell hardness number is respectively 68,66, but the hardness of WC-10Co-4Cr coat is minimum.
In addition, the microhardness of coating increases along with the increase of the carbon content in coating, and carbon content in coating is relevant with the residual quantity of carbide in particle deposition process and the amount of dissolving in of carbide.Compared with WC-10Co-2Cr spray material and other three kinds of spray material, there is higher carbon content, so the microhardness value recorded is relatively the highest.The hardness of usual material is higher, and its wear resistance is better, and can be known by above analytical results, WC-10Co-xCr (x=2,3,4,5) ceramic coated part has better plasticity_resistant deformation ability than matrix, is conducive to the abrasion resistance properties improving matrix.
Can know from table 5, WC-10Co-xCr (x=2,3,4,5) corrosion potential of coating is all higher than the corrosion potential of body material, wherein, the corrosion potential of WC-10Co-3Cr coating is the highest, but all higher than the corrosion potential of other three kinds of coatings, illustrate that corrosion tendency is minimum under same equi-potential.In addition, the corrosion electric current density Ic of four kinds of coatings is less than body material, and wherein the corrosion current density of WC-10Co-3Cr coating is minimum, is minimumly about 1.703 × 10
-4a × cm
-2.Corrosion current density has reacted material corrosion speed, and corrosion current density is less, illustrates that corrosion speed is less; Corrosion current density is larger, then illustrate that corrosion current is larger.To sum up analyze, under identical corrosive environment, compared with body material, WC-10Co-xCr (x=2,3,4,5) coating all has good corrosion resistance nature, and in addition, the corrosion resistance nature of WC-10Co-3Cr coating is better than other three kinds of coated materials.
For WC-10Co-xCr (x=2,3,4,5) coating, its excellence corrosion resistance nature mainly from two aspects.First, the structures shape of stupalith coating has good corrosion resistance nature, but also relevant with ceramic coating porosity, and coatingsurface hole is more, then more perishable, and this is also consistent with the analytical results of coating porosity above.Secondly, containing more Cr element in coating, Cr is erosion resistance element, and e.g., the stainless steel containing Cr element has corrosion resistance nature, and the existence of Cr element has greatly impelled the formation of passive film.
conclusion
1, adopt metallic substance PANDAT software to carry out Thermodynamic Simulation analysis and determine body material, carbon alloy wear resisting steel in selection, i.e. ZG42SiMnCr2MoCe, this material has higher hardness and toughness, can at its surface preparation WC-10Co-xCr (x=2,3,4,5) ceramic composite coating.
2, test uses dusty spray sphericity high, particle spherical surface rough porous, and the distribution of grain diameter in each interval range is comparatively even, and the coating utilizing hypersonic flame spraying to prepare gained combines good, and density is high.Wherein: the porosity of WC-10Co-2Cr coating is 4.4%, the porosity of WC-10Co-3Cr coating is 1.0%, the porosity of WC-10Co4Cr coating is 5.0%, the porosity of WC-10Co-5Cr coating is 4.6%, except the porosity of WC-10Co-3Cr coating is minimum in these four kinds of ceramic coatings, the porosity of WC-10Co4Cr coating is 5.0%, the highest.Major cause is that their Binder Phase content is different, and the Binder Phase liquid of melting can not be full of coating porosity place completely, causes the hole of porosity four kinds of coatings not identical.
3, coating is combined well with matrix, does not have larger-size crackle and hole, and based on mechanical bond, four kinds of coatings have all occurred decarburization phenomenon in the process of spraying, from the material phase analysis of four floating coats, have occurred faint W
2c phase.
4, coating mechanical experimental results display: the average microhardness of four kinds of coatings is all higher than the hardness of body material, wherein, WC-10Co-2Cr coating average microhardness is 70HRC, WC-10Co-3Cr coating average microhardness is 68HRC, WC-10Co-4Cr coating average microhardness is 61.4HRC, WC-10Co-5Cr coating average microhardness is 66HRC, and the microhardness of body material is 55.7HRC.This mainly because, under identical processing condition, except the grain graininess of powdered material self can affect except coating microhardness, the major cause wherein affecting microhardness is that in these powdered materials, Binder Phase CoCr content is different, and the microhardness of the coating finally causing them to prepare is not identical yet.
5, corrosion test illustrates: WC-10Co-xCr (x=2,3,4,5) coating has excellent corrosion resistance nature, and coating embodies the characteristic of ceramic coating and low porosity on the whole.Wherein, WC-10Co-3Cr coating has better abrasion resistance properties than other three kinds of coatings, and its corrosion potential is maximum, is about-0.460V, and corrosion current density is minimum, is about 1.703 × 10
-4a × cm
-2.
Schematically above be described the present invention and embodiment thereof, this description does not have restricted, and also just one of the embodiments of the present invention shown in accompanying drawing, actual structure is not limited thereto.So, if those of ordinary skill in the art enlightens by it, when not departing from the invention aim, designing the frame mode similar to this technical scheme and embodiment without creationary, all should protection scope of the present invention be belonged to.
Claims (9)
1. a preparation method for ball grinding machine lining board wear-resistant coating, is characterized in that, its step is as follows:
A, surface prepare: first will carry out surface alcohol or acetone cleaning wipe oil to base material, then carry out sandblasting roughening treatment to substrate surface to be sprayed;
B, thermal pretreatment: before spraying, carry out thermal pretreatment to substrate surface, preheating temperature is 200 ~ 300 DEG C, and the time is 60S;
C, spraying prime coat: utilize hypersonic flame spraying technology by mix and coat powder at 200 DEG C after dry 2 hours sprays to substrate surface the prime coat that a layer thickness is 80um;
D, spray coating operations layer: utilize hypersonic flame spraying technology by mix and coat powder at 200 DEG C after dry 2 hours is 250 μm ~ 300 μm in described step c, the spraying of gained piece surface is thick, be preferably potter's making coatings of 300um;
E, drying treatment: by steps d after spray coating operations layer coated part be placed in loft drier with 100 DEG C at dry 1 hour;
F, sealing treatment: use encapsulant to carry out sealing treatment to the hole of coat;
G, High temperature diffusion process: the coated part in step f after sealing treatment is placed in continuous hydrogen sintering furnace in 500-800 DEG C of sintering 40-60min, comes out of the stove after cooling and obtain having the ball grinding machine lining board of coat.
2. the preparation method of a kind of ball grinding machine lining board wear-resistant coating as claimed in claim 1, it is characterized in that: the mass percent of described substrate composition is C0.30 ~ 0.44wt%, Si1.50 ~ 2.0wt%, Mn0.8 ~ 1.40wt%, Cr2.0 ~ 2.8wt%, Mo≤0.3wt%, Ni≤0.3wt%, Re0.02wt%, P and S 0.04wt% altogether, and all the other are Fe; It is the weight ratio of the WC-Co powder of 95 ~ 98% and the Cr of 2 ~ 5%, described Cr/Co is 0.2 ~ 0.5 that described coat powder contains volume fraction, is preferably 0.3 ~ 0.4; The even discrete distribution of described WC-Co powder in the coating.
3. the preparation method of a kind of ball grinding machine lining board wear-resistant coating as claimed in claim 2, it is characterized in that: described WC-Co powder is WC-10Co powder, metal Co is coated with WC particle, surface irregularity porous, and described WC-10Co powder is particle diameter is the spherical or subsphaeroidal powdered alloys of 300 objects.
4. the preparation method of a kind of ball grinding machine lining board wear-resistant coating as claimed in claim 1, is characterized in that: in described coat, the weight ratio of Cr/Co is 0.3 ~ 0.4.
5. the preparation method of a kind of ball grinding machine lining board wear-resistant coating as claimed in claim 1, it is characterized in that: described coat homogeneous microstructure, densification, its porosity is 1 ~ 5%, and its average microhardness is 61.4 ~ 70HRC.
6. the preparation method of a kind of ball grinding machine lining board wear-resistant coating as claimed in claim 1, is characterized in that: the bonding strength of described coating piece coat is all higher than 70MPa.
7. the preparation method of a kind of ball grinding machine lining board wear-resistant coating as claimed in claim 1, it is characterized in that: the corrosion potential of described substrate in the NaCl solution of 3.5wt% is-0.618V, corrosion current density is 4.247 × 10
-4a × cm
-2; The corrosion potential of described coat in the NaCl solution of 3.5wt% is that between-0.550 ~-0.460V, corrosion current density is 3.548 × 10
-4~ 1.703 × 10
-4a × cm
-2between.
8. the preparation method of a kind of ball grinding machine lining board wear-resistant coating as claimed in claim 1, is characterized in that: utilize hypersonic flame spraying technology to spray potter's making coatings of thick 300 μm in steps d.
9. the preparation method of a kind of ball grinding machine lining board wear-resistant coating as claimed in claim 1, it is characterized in that: described supersonic flame hot-spraying techniques: preheating before spraying, the hydrocarbon of propane is utilized to be combustion gas, oxygen pressure is 1.15Mpa, propane flammable gas pressure is 0.45Mpa, and powder feeding gas flow is 4L/min, and nozzle diameter is 1mm, spray distance is 200mm, uses pressure-air cooling after spray.
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