CN115044858B - Powder core wire for preparing high-wear-resistance iron-based amorphous coating by plasma spraying and coating preparation method - Google Patents
Powder core wire for preparing high-wear-resistance iron-based amorphous coating by plasma spraying and coating preparation method Download PDFInfo
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- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 title claims abstract description 99
- 238000000576 coating method Methods 0.000 title claims abstract description 89
- 239000011248 coating agent Substances 0.000 title claims abstract description 84
- 239000000843 powder Substances 0.000 title claims abstract description 66
- 229910052742 iron Inorganic materials 0.000 title claims abstract description 50
- 238000007750 plasma spraying Methods 0.000 title claims abstract description 20
- 238000002360 preparation method Methods 0.000 title abstract description 12
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims abstract description 26
- 238000005507 spraying Methods 0.000 claims abstract description 22
- 239000000758 substrate Substances 0.000 claims abstract description 22
- 229910052786 argon Inorganic materials 0.000 claims abstract description 13
- 239000000463 material Substances 0.000 claims abstract description 11
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 9
- 239000010959 steel Substances 0.000 claims abstract description 9
- 239000010965 430 stainless steel Substances 0.000 claims abstract description 7
- 238000011049 filling Methods 0.000 claims abstract description 7
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 claims abstract description 5
- 239000001257 hydrogen Substances 0.000 claims abstract description 5
- 229910052739 hydrogen Inorganic materials 0.000 claims abstract description 5
- 229910052804 chromium Inorganic materials 0.000 claims abstract 2
- 238000000034 method Methods 0.000 claims description 26
- 229910000808 amorphous metal alloy Inorganic materials 0.000 claims description 12
- 238000004140 cleaning Methods 0.000 claims description 8
- 239000007921 spray Substances 0.000 claims description 6
- 239000011159 matrix material Substances 0.000 claims description 5
- 238000005488 sandblasting Methods 0.000 claims description 5
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims description 4
- 239000003344 environmental pollutant Substances 0.000 claims description 4
- 239000007789 gas Substances 0.000 claims description 4
- 238000000227 grinding Methods 0.000 claims description 4
- 231100000719 pollutant Toxicity 0.000 claims description 4
- 229910052799 carbon Inorganic materials 0.000 claims description 3
- 229910052759 nickel Inorganic materials 0.000 claims description 3
- 238000009987 spinning Methods 0.000 claims description 3
- 238000005096 rolling process Methods 0.000 claims description 2
- 230000003746 surface roughness Effects 0.000 claims description 2
- 229910052750 molybdenum Inorganic materials 0.000 claims 1
- 229910052721 tungsten Inorganic materials 0.000 claims 1
- 239000003814 drug Substances 0.000 abstract 1
- 229940079593 drug Drugs 0.000 abstract 1
- 239000000306 component Substances 0.000 description 11
- 229910045601 alloy Inorganic materials 0.000 description 10
- 239000000956 alloy Substances 0.000 description 10
- 238000002156 mixing Methods 0.000 description 10
- 238000010891 electric arc Methods 0.000 description 8
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 6
- 238000005299 abrasion Methods 0.000 description 5
- 239000002994 raw material Substances 0.000 description 5
- 239000010935 stainless steel Substances 0.000 description 5
- 229910001220 stainless steel Inorganic materials 0.000 description 5
- 238000012360 testing method Methods 0.000 description 5
- 238000001035 drying Methods 0.000 description 4
- 239000000203 mixture Substances 0.000 description 4
- 239000002245 particle Substances 0.000 description 4
- 238000002441 X-ray diffraction Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 238000004372 laser cladding Methods 0.000 description 3
- 238000005498 polishing Methods 0.000 description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- 244000137852 Petrea volubilis Species 0.000 description 2
- 239000002041 carbon nanotube Substances 0.000 description 2
- 229910021393 carbon nanotube Inorganic materials 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 238000005260 corrosion Methods 0.000 description 2
- 230000007797 corrosion Effects 0.000 description 2
- 238000000151 deposition Methods 0.000 description 2
- 239000011363 dried mixture Substances 0.000 description 2
- 230000004907 flux Effects 0.000 description 2
- 239000011261 inert gas Substances 0.000 description 2
- 239000011812 mixed powder Substances 0.000 description 2
- 230000003647 oxidation Effects 0.000 description 2
- 238000007254 oxidation reaction Methods 0.000 description 2
- 238000003825 pressing Methods 0.000 description 2
- 238000007873 sieving Methods 0.000 description 2
- 238000010408 sweeping Methods 0.000 description 2
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000008199 coating composition Substances 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 239000008358 core component Substances 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 239000002178 crystalline material Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000008021 deposition Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000007496 glass forming Methods 0.000 description 1
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 1
- 239000010931 gold Substances 0.000 description 1
- 229910052737 gold Inorganic materials 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000010309 melting process Methods 0.000 description 1
- 238000010587 phase diagram Methods 0.000 description 1
- 229910052698 phosphorus Inorganic materials 0.000 description 1
- 239000011574 phosphorus Substances 0.000 description 1
- 239000011253 protective coating Substances 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000005204 segregation Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 238000007751 thermal spraying Methods 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C4/00—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge
- C23C4/12—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge characterised by the method of spraying
- C23C4/134—Plasma spraying
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/44—Ferrous alloys, e.g. steel alloys containing chromium with nickel with molybdenum or tungsten
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/54—Ferrous alloys, e.g. steel alloys containing chromium with nickel with boron
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C4/00—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge
- C23C4/04—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge characterised by the coating material
- C23C4/06—Metallic material
- C23C4/08—Metallic material containing only metal elements
Abstract
A powder core wire for preparing a high wear-resistant iron-based amorphous coating by plasma spraying and a preparation method of the coating belong to the field of material surface engineering. The steel strip used for the wire skin is 430 stainless steel strip; the atomic percentage of the components of the drug core is 17.5-19.5at.% Cr; 0-1at.% of Ni; mo is 8-10at%; 2.5-4.5at.%; 13.5-15.5at.%; 2.5 to 4.5at.% of Si; 3-5at.%; fe in balance; powder core wire filling rate: 33%, diameter of powder core wire: 3mm. When the high wear-resistant iron-based amorphous coating is prepared by plasma spraying, the surface of a substrate is treated, spraying is carried out in an inert atmosphere environment, and the spraying technological parameters are as follows: the voltage is 60-64V; the current is 500-550A; the spraying distance is 100-120mm; argon flow is 45-50L/min; the hydrogen flow is 6-8L/min; the thickness of the coating is 300-500 mu m. The iron-based amorphous coating obtained by the invention has the advantages of high hardness, good wear resistance and excellent mechanical properties.
Description
Technical Field
The invention belongs to the field of surface engineering, and relates to a method for preparing an abrasion-resistant and corrosion-resistant iron-based amorphous coating by using plasma spinning.
Background
Amorphous alloys are solid alloys with off-balance, disordered structures, and exhibit excellent properties such as high hardness, corrosion resistance, etc., which are not possessed by crystals in many respects, due to the absence of defects such as grain boundary segregation, etc., common to crystalline materials. The iron-based amorphous alloy has the characteristics of high strength, high wear resistance, high glass forming capacity, low price and simple preparation, and is a surface wear-resistant material with great potential. Amorphous materials require a rapid cooling to preserve metastable structure during their preparation, and thus the size of amorphous bulk materials prepared by current means is extremely limited. While depositing the amorphous material as a coating on the substrate surface minimizes the size limitations. The thermal spraying has the characteristics of wide range of sprayable materials, high production efficiency, accurate and controllable coating composition and thickness, no limitation of matrix size and shape and the like, is an important method for preparing the iron-based amorphous coating, and has wide application prospect.
At present, an iron-based amorphous coating with a certain thickness meeting engineering requirements is mainly prepared by methods of electric arc spraying, plasma spraying, laser cladding and the like, for example, CN102251204A discloses a method for preparing a phosphorus-containing iron-based powder core wire with an amorphous phase coating by electric arc spraying and a coating preparation method, and the prepared coating has microhardness of about 900HV, good wear resistance and good mechanical property. CN111893404a discloses a high wear-resistant iron-based amorphous/carbon nanotube powder core wire, and its preparation method and application, the wire comprises 98.5-99.5wt.% iron-based amorphous and 0.5-1.5wt.% carbon nanotube, the bonding strength of the composite protective coating prepared by arc spraying method is not less than 30MPa, the hardness is not less than 700HV, and the friction coefficient is not more than 0.5.CN114016019a provides an iron-based amorphous coating, a preparation method and application thereof, a laser cladding technology is adopted to prepare a pre-iron-based amorphous coating on the surface of a substrate, the pre-iron-based amorphous coating is re-clad through a secondary remelting technology, and the hardness of the prepared coating is 1100-1250 HV.
In the preparation method of the amorphous coating, prealloyed amorphous powder or bar stock is used as raw materials in most cases, the components of the amorphous coating are determined by the raw materials, and component adjustment and performance adjustment are difficult to carry out. Some researches are to perform electric arc spraying in a mode of mixing powder of a flux-cored wire, so that amorphous coatings with different components can be obtained within a certain range, but due to the fact that oxidation of particles in electric arc spraying is very serious, great difficulty exists in preparing easily oxidized iron-based amorphous alloys, and amorphous alloys can be prepared only in simple alloy systems containing purified deoxidizing elements such as Fe-B and Fe-P. Therefore, the method adopts a mode of plasma spraying flux-cored wires, utilizes the extension nozzle to prepare the multi-component iron-based amorphous coating under the protection of inert gas, and compared with the existing arc spraying amorphous coating, the method has the advantages of obviously reduced oxide of the coating, higher hardness of the coating, excellent coating performance, simple preparation equipment and convenient operation.
Disclosure of Invention
The invention aims to provide a powder core wire for preparing a high-wear-resistance iron-based amorphous coating, a preparation method and application of the coating, and the prepared coating has high hardness and good wear resistance, and can improve the service performance and service life of parts under severe corrosive wear conditions.
The technical solution for realizing the purpose of the invention is as follows: a powder core wire for preparing a high wear-resistant iron-based amorphous coating by plasma spraying and a preparation method of the coating comprise the following steps:
rolling the powder core wire material for preparing the high-wear-resistance iron-based amorphous alloy coating by plasma spraying to finally obtain the powder core wire material with the diameter of 3.0mm, wherein the positive and negative tolerance is within 0.03 mm;
step (2), cleaning (mechanical polishing or sand blasting) and preheating the surface of the matrix;
preparing a high wear-resistant iron-based amorphous alloy coating by adopting a plasma spraying process under inert atmosphere, wherein the parameters of the plasma spraying process are as follows: the current is 500A, the voltage is 64V, the argon flow is 50L/min, the hydrogen flow is 8L/min, the spraying distance is 110mm, the wire feeding speed is 3.5m/min, and the coating thickness is 300-500 mu m. Argon is used as inert atmosphere shielding gas, and the flow rate of the argon is 6L/min.
Further, the powder core wire used for preparing the high wear-resistant iron-based amorphous alloy coating by plasma spraying in the step (1) is characterized in that the atomic percentage of the powder core components of the powder core wire is 17.5-19.5 at%; 0-1at.% of Ni; mo is 8-10at%; 2.5-4.5at.%; 13.5-15.5at.%; 2.5 to 4.5at.% of Si; 3-5at.%; fe and the balance. The steel strip used for the wire skin is 430 stainless steel strip; the diameter of the added powder in the powder core wire is smaller than 35 mu m; powder core wire filling rate: 33%.
Further, the cleaning treatment in the step (2) means that the surface of the substrate is ground flat by adopting a mechanical grinding mode, the roughness Ra is less than 0.5, and the surface oil embroidery and other pollutants can be removed by directly using brown alumina sand blasting, and the surface roughness after the treatment is Ra8.0-10.0.
Further, in the step (2), the steel substrate is preheated and is rapidly scanned on the surface of the substrate by using a plasma spray gun, so that the temperature of the surface of the substrate reaches 180-220 ℃.
The thickness of the coating prepared by the method is 300-500 mu m.
Compared with the background technology, the invention has obvious advancement, the iron-based amorphous coating for engineering is mainly prepared by methods of electric arc spraying, plasma spraying, laser cladding and the like, and in the existing methods, prealloyed amorphous powder or bar stock is mostly adopted as a raw material, and the components of the amorphous coating are determined by the raw material powder or bar stock and are limited. Some researchers perform electric arc spraying in a powder mixing mode of a flux-cored wire, and although amorphous coatings with different components can be obtained in a certain range, because the oxidation of particles in electric arc spraying is very serious, great difficulty exists in preparing easily oxidized iron-based amorphous alloys, and only simple amorphous alloy systems containing deoxidizing elements such as Fe-B and Fe-P can be selected.
Therefore, the invention adopts a mode of plasma spraying the flux-cored wire, utilizes the extension nozzle to ensure that the iron-based amorphous coating is prepared under the protection of inert gas, can realize the multiple allocation of multiple components by utilizing the flux-cored wire, and can ensure that the iron-based amorphous coating is changed in a larger range.
The invention avoids the complex process of spraying the coating after the amorphous powder in the traditional plasma amorphous powder spraying process, and is more suitable for practical engineering application, especially in the engineering field construction of the wear-resistant parts. Because wire feeding is more flexible and more convenient than powder feeding, the powder feeding needs an additional powder feeder, and the air tightness of all powder feeding passages in a closed pipeline is ensured, which is often difficult to achieve in field construction. By utilizing a plasma spinning method, the added alloy raw material can be directly converted into spray particles of amorphous components through alloy reaction in the melting process of the wire, and the spray particles become an amorphous coating after deposition.
Compared with the existing arc spraying method which uses wires as well, the method adopts a higher-temperature plasma jet rather than an electric arc as a heat source, so that the selection of components in an amorphous alloy system can be wider, the addition amount of some high-melting-point alloy elements can be more, the performance of a coating can be better, and meanwhile, the whole spraying process is carried out in an inert atmosphere. Compared with the conventional arc spraying iron-based alloy coating, the iron-based amorphous coating prepared by the method has the advantages of obviously fewer oxides, higher hardness and better coating performance.
Drawings
FIG. 1A cross-sectional gold phase diagram of an iron-based amorphous coating prepared in example 1
FIG. 2 XRD pattern of iron-based amorphous coating prepared in example 1
FIG. 3 graph of friction coefficient of iron-based amorphous coating and substrate prepared in example 1
FIG. 4A volume chart of wear of iron-based amorphous coating and matrix prepared in example 1
Detailed Description
The invention will be better understood from the following examples. However, it will be readily understood by those skilled in the art that the specific material ratios, process conditions and results thereof described in the examples are illustrative of the present invention and should not be construed as limiting the invention described in detail in the claims.
Example 1:
a powder core wire for preparing a high wear-resistant iron-based amorphous alloy coating by plasma spraying, wherein the wire is prepared by coating a powder core with 430 stainless steel strips, and the powder core is prepared by mixing eight element powders; the filling rate of the powder core wire is 33%; the diameter of the powder added into the powder core wire is smaller than 35 mu m; the atomic percentage of the components of the flux core is 18.5 at%; 0.5at.% Ni; mo 9at.%; 3.5 percent of C; 13.5at.%; 3.5at.% Si; 4at.% of W; fe and the balance.
The high wear-resistant iron-based amorphous powder core wire is obtained by the following steps:
(1) Mixing eight element powders according to atomic percentage, wherein the diameter of the powder is smaller than 35 mu m, adding alcohol after mixing, and wet mixing for 24 hours at 120r/min by utilizing a ball mill to obtain a mixture, wherein the weight ratio of the stainless steel grinding balls to the mixed powder is 4:1;
(2) Placing the mixture in a rotary evaporator, drying until alcohol volatilizes, placing the dried mixture in an oven at 80 ℃ for drying for 4 hours, and then sieving with a 60-mesh sieve to obtain powder;
(3) Pressing 430 stainless steel bands into U-shaped shapes, and adding the powder in the step (2) into the U-shaped grooves;
(4) Closing the U-shaped stainless steel belt, coating the powder therein, gradually drawing and reducing the diameter to finally obtain the powder core wire with the diameter of 3mm.
The application of the iron-based amorphous powder core wire in preparing the high wear-resistant iron-based amorphous coating comprises the following steps:
(1) And cleaning and preheating the surface of the substrate. Sequentially polishing with 400, 600 and 800-mesh sand paper, cleaning with alcohol to remove stains, and sand blasting with brown alumina to remove surface oil embroidery and other pollutants, wherein the roughness of the treated surface is Ra9.0; and (3) rapidly sweeping the surface of the substrate by using a plasma spray gun to ensure that the temperature of the steel substrate reaches 200 ℃.
(2) Filling the powder core wire into a wire feeder of plasma spraying equipment, and preparing a coating on the surface of a pretreated substrate, wherein the specific parameters are as follows: the current is 500A, the voltage is 60V, the argon flow is 45L/min, the hydrogen flow is 6L/min, the spraying distance is 100mm, and the wire feeding speed is 3.5m/min. Argon is used as inert atmosphere shielding gas, and the flow rate of the argon is 6L/min.
Example 2:
a powder core wire for preparing a high wear-resistant iron-based amorphous alloy coating by plasma spraying, wherein the wire is prepared by coating a powder core with 430 stainless steel strips, and the powder core is prepared by mixing eight element powders; the filling rate of the powder core wire is 33%; the diameter of the powder added into the powder core wire is smaller than 35 mu m; the atomic percentage of the components of the flux core is 18.5 at%; 0.5at.% Ni; mo 9at.%; 3.5 percent of C; 13.5at.%; 3.5at.% Si; 4at.% of W; fe and the balance.
The high wear-resistant iron-based amorphous powder core wire is obtained by the following steps:
(1) Mixing eight element powders according to atomic percentage, wherein the diameter of the powder is smaller than 35 mu m, adding alcohol after mixing, and wet mixing for 24 hours at 120r/min by utilizing a ball mill to obtain a mixture, wherein the weight ratio of the stainless steel grinding balls to the mixed powder is 4:1;
(2) Placing the mixture in a rotary evaporator, drying until alcohol volatilizes, placing the dried mixture in an oven at 80 ℃ for drying for 4 hours, and then sieving with a 60-mesh sieve to obtain powder;
(3) Pressing 430 stainless steel bands into U-shaped shapes, and adding the powder in the step (2) into the U-shaped grooves;
(4) Closing the U-shaped stainless steel belt, coating the powder therein, gradually drawing and reducing the diameter to finally obtain the powder core wire with the diameter of 3mm.
The application of the iron-based amorphous powder core wire in preparing the high wear-resistant iron-based amorphous coating comprises the following steps:
(1) And cleaning and preheating the surface of the substrate. Sequentially polishing with 400, 600 and 800-mesh sand paper, cleaning with alcohol to remove stains, and sand blasting with brown alumina to remove surface oil embroidery and other pollutants, wherein the roughness of the treated surface is Ra9.0; and (3) rapidly sweeping the surface of the substrate by using a plasma spray gun to ensure that the temperature of the steel substrate reaches 200 ℃.
(2) Filling the powder core wire into a wire feeder of plasma spraying equipment, and preparing a coating on the surface of a pretreated substrate, wherein the specific parameters are as follows: current 550A, voltage 64V, argon flow 50L/min, hydrogen flow 8L/min, spraying distance 120mm, wire feeding speed 3.5m/min. Argon is used as inert atmosphere shielding gas, and the flow rate of the argon is 8L/min.
According to the embodiment, the high wear-resistant iron-based amorphous coating is prepared, and the performance detection is described with reference to the accompanying drawings:
1. the coating prepared in the example was subjected to porosity analysis, and the coating porosity was analyzed by an Image method using Image Pro Plus 6.0 Image analysis software to evaluate the coating compactness. Five metallographic photographs of the cross-sections of the coatings prepared in the examples were calculated and averaged. Fig. 1 is a metallographic photograph of a cross section of a coating prepared in example 1, and it can be seen that the iron-based amorphous coating is well bonded with a stainless steel substrate, the thickness of the coating is about 450 μm, the porosity of the coating is only 2%, and the iron-based amorphous alloy coating has no macropores and has higher compactness.
2. The coatings prepared in the examples were subjected to an X-ray diffraction experiment using a D8ADVANCE X-ray diffractometer. The test conditions were: the Cu target K alpha radiates at 40kV and 50mA current, the diffraction angle (2 theta) is measured in the range of 10-90 degrees, the scanning step length is 0.02 degrees, and the temperature is 298K. Fig. 2 shows the XRD pattern of the coating prepared in example 1, and it can be seen that the iron-based amorphous alloy coating has a significantly broad peak at about 43 °, indicating that the coating is mainly amorphous. But, due to the presence of many crystalline phases, appear as many narrower peaks including Cr oxide, WC.
3. The coatings prepared in the examples were subjected to microhardness testing using a HXD-1000TM digital microhardness tester with a test force of 100gf and a load time of 10s, and 10 areas were randomly selected for measurement, and the average hardness values were shown in Table 1.
4. The coating prepared in the embodiment is subjected to a wear resistance test, and the coating is subjected to a friction and wear test by using a CFT-1 type friction and wear comprehensive performance tester, wherein a friction pair is a steel ball with the diameter of 6mmGCr15, the load is 20N, the friction rate is 200r/min, the sliding length is 5mm, and the sliding time is 30min. Fig. 3 is a graph of friction coefficient of the coating prepared in example 1, and fig. 4 is a graph of abrasion volume of the coating prepared in example 1 and abrasion of the substrate, and it can be seen that the abrasion volume of the iron-based amorphous coating is 1/3 of that of the substrate, indicating that the iron-based amorphous coating has excellent abrasion resistance.
Table 1 example 1 porosity and microhardness
Claims (4)
1. A powder core wire for preparing a high wear-resistant iron-based amorphous alloy coating by plasma spraying is characterized in that a steel strip used for wire skin is 430 stainless steel strip; powder core wire filling rate: 33%; the diameter of the added powder in the powder core wire is smaller than 35 mu m; the core comprises, by atom, 17.5-19.5at.% Cr, 0-1at.% Ni, 8-10at.% Mo, 2.5-4.5at.% C, 13.5-15.5at.% B, 2.5-4.5at.% Si, 3-5at.% W, and Fe as the rest.
2. A method for preparing a high wear-resistant iron-based amorphous coating by using the cored wire as claimed in claim 1, wherein the method for preparing the coating under the protection of inert atmosphere by adopting a plasma spinning method comprises the following steps:
rolling the powder core wire material to obtain the powder core wire material with the diameter of 3.0mm and the positive and negative tolerance within 0.03 mm;
step (2), cleaning and preheating the surface of the matrix to enable the surface temperature of the matrix to reach 180-220 ℃;
preparing a high wear-resistant iron-based amorphous alloy coating by adopting a plasma spraying process under inert atmosphere, wherein the parameters of the plasma spraying process are as follows: the current is 500-550A, the voltage is 60-64V, the argon flow is 45-50L/min, the hydrogen flow is 6-8L/min, the spraying distance is 100-120mm, the wire feeding speed is 3.5m/min, and the coating thickness is 300-500 mu m; argon is used as inert atmosphere shielding gas, and the flow rate of the argon is 6-8L/min.
3. The method according to claim 2, wherein the cleaning treatment in the step (2) means that the surface of the substrate is ground flat by adopting a mechanical grinding mode, the roughness Ra is less than 0.5, or brown fused alumina is directly used for sand blasting to remove surface pollutants, and the surface roughness after the treatment is Ra8.0-10.0.
4. The method of claim 2, wherein the preheating of the steel substrate in step (2) is performed by spraying the surface of the steel substrate with a plasma spray gun.
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| CN202210658073.4A CN115044858B (en) | 2022-06-12 | 2022-06-12 | Powder core wire for preparing high-wear-resistance iron-based amorphous coating by plasma spraying and coating preparation method |
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|---|---|---|---|
| CN202210658073.4A CN115044858B (en) | 2022-06-12 | 2022-06-12 | Powder core wire for preparing high-wear-resistance iron-based amorphous coating by plasma spraying and coating preparation method |
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| US4473401A (en) * | 1982-06-04 | 1984-09-25 | Tsuyoshi Masumoto | Amorphous iron-based alloy excelling in fatigue property |
| CN1948544A (en) * | 2006-11-13 | 2007-04-18 | 安泰科技股份有限公司 | High corrosion resistant antiwear iron base heat spray coating layer material and its preparation method |
| CN101298654A (en) * | 2008-06-30 | 2008-11-05 | 钢铁研究总院 | Ceramic-phase-containing iron-based amorphous nanocrystalline composite coating and preparation thereof |
| CN102517536A (en) * | 2011-12-15 | 2012-06-27 | 北京矿冶研究总院 | Novel plasma powder core wire inner wall spraying method |
| CN103290350A (en) * | 2013-04-17 | 2013-09-11 | 华为技术有限公司 | Magnesium alloy raw material or product and preparation method for conductive anticorrosive coating thereof |
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| US4473401A (en) * | 1982-06-04 | 1984-09-25 | Tsuyoshi Masumoto | Amorphous iron-based alloy excelling in fatigue property |
| CN1948544A (en) * | 2006-11-13 | 2007-04-18 | 安泰科技股份有限公司 | High corrosion resistant antiwear iron base heat spray coating layer material and its preparation method |
| CN101298654A (en) * | 2008-06-30 | 2008-11-05 | 钢铁研究总院 | Ceramic-phase-containing iron-based amorphous nanocrystalline composite coating and preparation thereof |
| CN102517536A (en) * | 2011-12-15 | 2012-06-27 | 北京矿冶研究总院 | Novel plasma powder core wire inner wall spraying method |
| CN103290350A (en) * | 2013-04-17 | 2013-09-11 | 华为技术有限公司 | Magnesium alloy raw material or product and preparation method for conductive anticorrosive coating thereof |
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