CN111363965A - Iron-based composite coating for reinforcing steel transmission tower, preparation method and material - Google Patents
Iron-based composite coating for reinforcing steel transmission tower, preparation method and material Download PDFInfo
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- CN111363965A CN111363965A CN202010260065.5A CN202010260065A CN111363965A CN 111363965 A CN111363965 A CN 111363965A CN 202010260065 A CN202010260065 A CN 202010260065A CN 111363965 A CN111363965 A CN 111363965A
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C30/00—Alloys containing less than 50% by weight of each constituent
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F9/00—Making metallic powder or suspensions thereof
- B22F9/02—Making metallic powder or suspensions thereof using physical processes
- B22F9/04—Making metallic powder or suspensions thereof using physical processes starting from solid material, e.g. by crushing, grinding or milling
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K10/00—Welding or cutting by means of a plasma
- B23K10/02—Plasma welding
- B23K10/027—Welding for purposes other than joining, e.g. build-up welding
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C32/00—Non-ferrous alloys containing at least 5% by weight but less than 50% by weight of oxides, carbides, borides, nitrides, silicides or other metal compounds, e.g. oxynitrides, sulfides, whether added as such or formed in situ
- C22C32/0047—Non-ferrous alloys containing at least 5% by weight but less than 50% by weight of oxides, carbides, borides, nitrides, silicides or other metal compounds, e.g. oxynitrides, sulfides, whether added as such or formed in situ with carbides, nitrides, borides or silicides as the main non-metallic constituents
- C22C32/0052—Non-ferrous alloys containing at least 5% by weight but less than 50% by weight of oxides, carbides, borides, nitrides, silicides or other metal compounds, e.g. oxynitrides, sulfides, whether added as such or formed in situ with carbides, nitrides, borides or silicides as the main non-metallic constituents only carbides
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F9/00—Making metallic powder or suspensions thereof
- B22F9/02—Making metallic powder or suspensions thereof using physical processes
- B22F9/04—Making metallic powder or suspensions thereof using physical processes starting from solid material, e.g. by crushing, grinding or milling
- B22F2009/041—Making metallic powder or suspensions thereof using physical processes starting from solid material, e.g. by crushing, grinding or milling by mechanical alloying, e.g. blending, milling
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Abstract
The invention discloses an iron-based composite coating for reinforcing a material for a power transmission tower, a preparation method and a material, wherein the composite coating comprises 25-35 wt.% of tungsten carbide powder and 65-75 wt.% of Fe55 iron-based alloy powder. The preparation method comprises mixing tungsten carbide powder and iron-based alloy powder; grinding the mixed tungsten carbide powder and Fe55 iron-based alloy powder; drying the ground tungsten carbide powder and Fe55 iron-based alloy powder, and taking the dried tungsten carbide powder and Fe55 iron-based alloy powder as original powder for plasma surfacing; pretreating the surface of the substrate; and forming a composite coating on the surface of the pretreated substrate by a synchronous powder feeding plasma surfacing process. Compared with the common Q235 electrochemical corrosion, the tungsten carbide reinforced iron-based composite coating prepared on the Q235 matrix has obvious corrosion resistance and mechanical property.
Description
Technical Field
The invention relates to the technical field of materials for power transmission line towers, in particular to an iron-based composite coating for a reinforced material for the power transmission line towers, a preparation method and a material.
Background
For a long time, the steel materials for the transmission line iron tower in China mainly comprise Q235 and Q345 hot-rolled angle steel, and compared with the international advanced countries, the steel materials for the transmission line iron tower in China are single in material, low in strength value and small in material selection margin. With the continuous increase of the power demand in China, due to the shortage of land resources and the improvement of environmental protection requirements in China, the problems of circuit path selection and removal of facilities along the line, such as houses and the like, are becoming more serious, the large-capacity and high-voltage-class power transmission lines are rapidly developed, and the same-tower multi-loop lines and the alternating current 750kV, 1000kV and direct current +/-800 kV power transmission lines with higher voltage classes appear. All of the steel towers tend to be large-sized, the design load of the tower is larger and larger, the corrosion resistance requirement of the tower is higher and higher due to the complexity of the use environment, and the common hot-rolled angle steel cannot meet the use requirement of the tower with the large load in terms of mechanical property and corrosion resistance.
Common large-load towers use combined section angle steel, but the combined section angle steel wind load size coefficient is great, the number and specification of rods are many, the node structure is complex, the use amount of connecting plates and constructional plates is large, the installation is complex, and the engineering construction investment is greatly increased. The steel tube tower has the defects of complex structure, difficult control of welding seam quality, low processing production efficiency, high price of the tube and processing cost, large investment of processing equipment in a tower factory and the like. The design work of iron towers for many years leads the type of the iron tower to be improved, the cost is further saved, and only starting from the material, the material for the power transmission iron tower with more excellent mechanical property and corrosion resistance is obtained, so as to meet the use requirement of the large-load tower in China.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides an iron-based composite coating for a reinforced power transmission tower material, a preparation method and a material.
According to a first aspect of the invention, the invention discloses an iron-based composite coating for reinforcing a material for a power transmission tower, which comprises: 25 wt.% to 35 wt.% tungsten carbide powder and 65 wt.% to 75 wt.% Fe55 iron-based alloy powder, in weight percent.
According to one embodiment of the present invention, the tungsten carbide powder is 30 wt.%, and the Fe55 iron-based alloy powder is 70 wt.%.
According to a second aspect of the invention, the invention discloses a preparation method of an iron-based composite coating for reinforcing materials for a power transmission tower, which comprises the following steps:
mixing tungsten carbide powder and iron-based alloy powder according to weight percentage, wherein the tungsten carbide powder accounts for 25-35 wt%, and the Fe55 iron-based alloy powder accounts for 65-75 wt%;
grinding the mixed tungsten carbide powder and Fe55 iron-based alloy powder;
drying the ground tungsten carbide powder and Fe55 iron-based alloy powder, and taking the dried tungsten carbide powder and Fe55 iron-based alloy powder as original powder for plasma surfacing;
pretreating the surface of the substrate;
and synthesizing a composite coating on the surface of the pretreated substrate by a synchronous powder feeding plasma surfacing process.
According to one embodiment of the present invention, the mixed tungsten carbide powder and Fe55 iron-based alloy powder are ground for 30 minutes or more.
According to an embodiment of the present invention, the pre-treating the surface of the substrate comprises:
carrying out sand blasting treatment on the surface of the matrix;
cleaning the surface of the substrate subjected to sand blasting by using industrial alcohol;
and (3) drying the cleaned matrix in an electrothermal blowing dryer.
According to one embodiment of the present invention, the tungsten carbide powder and the Fe55 iron-based alloy powder after polishing are dried at a drying temperature of 60 ℃ for a drying time of 1.5 hours or more.
According to one embodiment of the present invention, the mixed tungsten carbide powder and Fe55 iron-based alloy powder were placed in a GMS jar mill, and the mixed tungsten carbide powder and Fe55 iron-based alloy powder were ground.
According to one embodiment of the invention, when the coating is synthesized on the surface of the substrate by adopting the synchronous powder feeding plasma surfacing process, the main arc current is 130A-140A.
According to one embodiment of the invention, when the composite coating is synthesized on the surface of the substrate by adopting the synchronous powder feeding plasma surfacing process, the moving speed of the plasma welding gun is 100mm/s, the defocusing amount is 50mm, and the size W of the rectangular light spot is 15.7mm to D × pi2。
According to a third aspect of the invention, the invention provides an iron-based composite material for reinforcing materials for power transmission towers, which comprises a substrate, wherein an iron-based composite coating is synthesized on the surface of the substrate.
Compared with the common Q235 electrochemical corrosion, the tungsten carbide reinforced iron-based composite coating prepared on the Q235 substrate has the corrosion resistance of 550 omega for the Q235 substrate with the composite coating and 300 omega for the common Q235 corrosion, and data show that the tungsten carbide reinforced iron-based composite coating has obvious corrosion resistance and mechanical property.
Drawings
The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the application and together with the description serve to explain the application and not to limit the application. In the drawings:
FIG. 1 is a schematic view of a process for preparing an iron-based composite coating for a material for an enhanced transmission tower in an embodiment;
FIG. 2 is a metallographic structure diagram of an iron-based composite coating prepared on the surface of a Q235 substrate when plasma main arc currents are 130A and 140A, in examples of 25 wt.% tungsten carbide powder and 75 wt.% Fe55 iron-based alloy powder;
FIG. 3 is a metallographic structure diagram of an iron-based composite coating prepared on the surface of a Q235 substrate at main plasma arc currents of 130A and 140A, wherein 30 wt.% of tungsten carbide powder and 70 wt.% of Fe55 iron-based alloy powder are adopted in the example;
FIG. 4 is a metallographic representation of the metallographic structure of the iron-based composite coating produced on the surface of a Q235 substrate at plasma main arc currents of 130A and 140A for 35 wt.% tungsten carbide powder (WC) and 65 wt.% Fe55 iron-based alloy powder in the example;
FIG. 5 is a graph showing the zeta potential polarization curve measured by an electrochemical workstation for the iron-based composite material prepared in the example when the main arc current of different ratios is 130A;
FIG. 6 is a zeta potential polarization curve measured by an electrochemical workstation for the iron-based composite material prepared in the embodiment when the main arc current of different proportions is 140A;
FIG. 7 is a schematic diagram of an EIS spectrum Nyquist plot of the composite material at a plasma main arc current of 130A in the example;
FIG. 8 is a schematic diagram of an EIS spectrum Nyquist plot of the composite material at a plasma main arc current of 140A in the example.
Detailed Description
In the following description, for purposes of explanation, numerous implementation details are set forth in order to provide a thorough understanding of the various embodiments of the present invention. It should be understood, however, that these implementation details are not to be interpreted as limiting the invention. That is, in some embodiments of the invention, such implementation details are not necessary. In addition, some conventional structures and components are shown in simplified schematic form in the drawings.
There are many commonly used powders of the modifier material, such as iron-based alloy powder, nickel-based alloy powder, cobalt-based alloy powder, titanium-based alloy powder, and the like. The iron-based alloy powder is one of the most commonly used plasma surfacing materials, has excellent hardness and corrosion resistance, and is usually added with a proper amount of trace elements to prepare an alloy material with special properties. The tungsten carbide has a chemical formula of WC, a melting point of 2570 ℃, a boiling point of 6000 ℃ and a relative density of 15.77g, is dark gray powder, is a main raw material for producing hard alloys, diamond tools, drill bits and various hard alloy cutters, the hardness of the tungsten carbide is the hardest binary carbide at high temperature and is close to that of diamond, and Fe55 iron-based alloy powder and tungsten carbide powder are adopted to synthesize a composite coating on the surface of a matrix, so that the obtained tungsten carbide powder reinforced iron-based composite material has excellent frictional wear resistance, corrosion resistance and mechanical properties.
Example one
The iron-based composite coating for reinforcing the steel tower for power transmission comprises:
25 wt.% of tungsten carbide powder and 75 wt.% of Fe55 iron-based alloy powder, wherein the tungsten carbide powder is a ball-milled powder.
Example two
The iron-based composite coating for reinforcing the steel tower for power transmission comprises:
30 wt.% of tungsten carbide powder and 70 wt.% of Fe55 iron-based alloy powder, wherein the tungsten carbide powder is ball-milled powder.
EXAMPLE III
The iron-based composite coating for reinforcing the steel tower for power transmission comprises:
35 wt.% of tungsten carbide powder and 65 wt.% of Fe55 iron-based alloy powder, wherein the tungsten carbide powder is a ball-milled powder.
Example four
Referring to fig. 1, which is a flowchart of a method for preparing an iron-based composite coating for a power transmission tower in this embodiment, the method for preparing an iron-based composite coating for a power transmission tower includes:
fully mixing tungsten carbide powder and Fe55 iron-based alloy powder according to the weight percentage of the first embodiment, the second embodiment and the third embodiment;
after mixing, grinding and mixing the mixed tungsten carbide powder and Fe55 iron-based alloy powder in a GMS jar mill for more than 30 minutes to ensure that the powder particles are finer and the mixing is more uniform;
then placing the ground powder into an electric heating blast drying oven for drying, and taking the dried tungsten carbide powder and Fe55 iron-based alloy powder as plasma surfacing original powder for later use, wherein the drying temperature is 60 ℃, and the drying time is more than 1.5 hours for later use;
and (3) pretreating the surface of the Q235 substrate. Firstly carrying out sand blasting treatment on the surface of a matrix, then cleaning the surface of the matrix subjected to the sand blasting treatment by adopting industrial alcohol, drying the cleaned matrix in an electric heating blast drier, and putting the dried matrix in a drying dish for later use.
When the composite coating is synthesized on the surface of the substrate by adopting the synchronous powder feeding plasma surfacing process, the main arc current range is set to be 130A-140A, the surfacing speed is 1.0mm/s, the moving speed of a plasma welding gun is 100mm/s, the defocusing amount is H-50 mm, and the size W-D × pi-15.7 mm of a rectangular light spot2。
EXAMPLE five
The embodiment also provides an iron-based composite material for reinforcing the material for the power transmission tower, which comprises a base material, wherein a composite coating comprising 25 wt.% to 35 wt.% of tungsten carbide powder and 65 wt.% to 75 wt.% of Fe55 iron-based alloy powder is formed on the surface of the base material.
After the iron-based composite material is obtained, the structural properties of the iron-based composite material are analyzed through a metallographic microscope, X-ray diffraction (XRD) and Scanning Electron Microscope (SEM) in combination with energy spectrum analysis (EDS) point scanning.
The metallographic structure of the iron-based composite material obtained by adopting the synchronous powder feeding plasma surfacing process in different proportions is researched.
As shown in fig. 2, which is a schematic metallographic structure of an iron-based composite material prepared by 25 wt.% tungsten carbide powder and 75 wt.% Fe55 iron-based alloy powder and plasma main arc currents of 130A and 140A; FIG. 3 is a schematic representation of the metallographic structure of an iron-based composite material prepared with 30 wt.% tungsten carbide powder and 70 wt.% Fe55 iron-based alloy powder at plasma main arc currents of 130A and 140A; fig. 4 is a schematic metallographic structure of an iron-based composite material prepared by using 35 wt.% tungsten carbide powder (WC) and 65 wt.% Fe55 iron-based alloy powder and plasma main arc currents of 130A and 140A.
In the figure, the lower side is a matrix, the upper side is a plasma cladding iron-based composite coating, and the iron-based composite coating can clearly show the microstructure appearance of a sample after being corroded by aqua regia. The iron-based composite material obtained by plasma surfacing mainly comprises three parts: the structure of the deep matrix is not greatly influenced by plasma overlaying, the structure formed by the heat affected zone is relatively uniform, and an obvious layered structure is formed between the iron-based composite coating and the heat affected zone and is determined by the characteristics of the plasma overlaying. The typical granular crystal structure in the iron-based composite coating is due to the bulk tungsten carbide rich regions in the iron-based composite coating.
The micro-morphology of the iron-based composite coating is different in different reaction ratios, and when the reaction ratio is 30 wt.% of tungsten carbide powder and 70 wt.% of Fe55 iron-based alloy powder, the micro-morphology of the iron-based composite coating is better than that of the iron-based composite coating under the corresponding other two groups of reaction ratios.
Under the reaction of the same reaction mixture ratio, the microscopic morphology of the composite coating microstructure of the plasma main arc current 130A is more obvious and clearer than that of the composite coating microstructure of the plasma main arc current 140A. By comparing metallographic structure diagrams under different reaction ratios, it can be seen that: when the reaction ratio is 30 wt.% of tungsten carbide powder and 70 wt.% of Fe55 iron-based alloy powder and the main arc current of a plasma surfacing welder is 130A, a better iron-based composite coating microstructure can be obtained.
The corrosion resistance of the iron-based composite material obtained by different proportions and adopting the synchronous powder feeding plasma surfacing process is tested.
FIG. 5 is a potentiodynamic polarization curve diagram of an iron-based composite material obtained by a synchronous powder feeding plasma surfacing process when main arc currents of different proportions are 130 amperes, and measured by an electrochemical workstation. FIG. 6 is a potentiodynamic polarization curve diagram of an iron-based composite material obtained by a synchronous powder feeding plasma surfacing process when the main arc current of different proportions is 140 amperes, and measured by an electrochemical workstation.
The polarization curve is determined through corrosion electrochemistry research, the main arc current of the plasma is 130 amperes and 140 amperes respectively, and relevant parameters when the electrokinetic potential scanning method is adopted for measurement are as follows: the scanning potential is-600 mV-800 mV, and the scanning speed is 1 mV/s.
As can be seen by comparing fig. 5 and 6, it can be seen from fig. 5 that the self-corrosion potential of the iron-based composite is about-590 mV, and that when the iron-based composite made from 35 wt.% of the tungsten carbide powder and 65 wt.% of the Fe55 iron-based alloy powder has a minimum self-corrosion potential of about-510 mV, it can be seen that the self-corrosion potential of the iron-based composite is significantly higher than that of the Q235 matrix and that when the reactant composition is 30 wt.% of the tungsten carbide powder and 70 wt.% of the Fe55 iron-based alloy powder, the iron-based composite has a maximum self-corrosion potential of about-440 mV.
From FIG. 6, it can be seen that the self-corrosion potential of the iron-based composite material is about-590 mV, and when the mixture ratio of 35 wt.% of tungsten carbide powder and 65 wt.% of Fe55 iron-based alloy powder is about-530 mV, the self-corrosion potential of the iron-based composite material is significantly higher than that of the Q235 matrix, and when the mixture ratio of the reactants is 30 wt.% of tungsten carbide powder and 70 wt.% of Fe55 iron-based alloy powder, the highest self-corrosion potential of the iron-based composite material is about-490 mV.
Comparing the zeta potential polarization curves of the iron-based composite material under different main arc currents, it is obvious that the self-corrosion potential is higher when the main arc current is 130A than when the main arc current is 140A on the whole.
From the above, it can be seen that the self-corrosion potential of the iron-based composite material is significantly higher than that of the matrix material, the main arc current is 130A, and the highest self-corrosion potential is-450 mV when the reaction mixture ratio is 30 wt.% of tungsten carbide powder and 70 wt.% of Fe55 iron-based alloy powder, i.e., the corrosion resistance is the best.
The following researches are carried out on EIS (electron emission spectroscopy) spectrum Nyquist graphs of the iron-based composite material obtained by adopting the synchronous powder feeding plasma surfacing process according to different proportions.
FIG. 7 is a schematic representation of an EIS spectrum Nyquist plot of an iron-based composite at a plasma main arc current of 130 amps; FIG. 8 is a schematic representation of an EIS spectrum Nyquist plot of an iron-based composite material at a plasma main arc current of 140 amps.
Looking at fig. 7 and 8, studied in conjunction with fig. 5 and 6, when the main arc current is 130 amps, the capacitive reactance arc radius appears: 30 wt.% WC > 35 wt.% WC > 25 wt.% WC > matrix. The corrosion resistance of the substrate is about 300 omega; 25 wt.% WC, namely an iron-based composite material obtained by 25 wt.% tungsten carbide powder and 75 wt.% Fe55 iron-based alloy powder according to the reaction ratio, wherein the corrosion resistance is about 450 omega; 30 wt.% WC, namely an iron-based composite material obtained by 30 wt.% tungsten carbide powder and 70 wt.% Fe55 iron-based alloy powder according to the reaction ratio, wherein the corrosion resistance is about 550 omega; 35 wt.% WC, namely 30 wt.% tungsten carbide powder and 70 wt.% Fe55 iron-based alloy powder, the corrosion resistance of the iron-based composite material is about 470 omega. When the main arc current is 140A, the capacitive reactance arc radius also presents: 30 wt.% WC > 35 wt.% WC > 25 wt.% WC > matrix. The corrosion resistance of the substrate is about 300 omega; 25 wt.% WC, namely an iron-based composite material obtained by 25 wt.% tungsten carbide powder and 75 wt.% Fe55 iron-based alloy powder according to the reaction ratio, wherein the corrosion resistance is about 430 omega; 30 wt.% WC, namely an iron-based composite material obtained by 30 wt.% tungsten carbide powder and 70 wt.% Fe55 iron-based alloy powder in the reaction ratio, wherein the corrosion resistance is about 530 omega; 35 wt.% WC, namely 30 wt.% tungsten carbide powder and 70 wt.% Fe55 iron-based alloy powder, the corrosion resistance of the iron-based composite material is about 450 omega. The analysis shows that the iron-based composite material obtained by plasma surfacing has better electrochemical impedance performance compared with a Q235 matrix. When the main arc current is 130A, the iron-based composite material obtained by using 30 wt.% of tungsten carbide powder and 70 wt.% of Fe55 iron-based alloy powder in the reaction ratio has the best electrochemical corrosion performance.
The damaged materials for the power transmission iron tower can be repaired in a mode of preparing an iron-based composite coating on the surface of a matrix through synchronous powder feeding plasma surfacing reaction by adopting the proportion.
It can be seen from table 1 that the yield strength and tensile strength of the iron-based composite material sample after the damage simulation and the synchronous powder feeding plasma surfacing repair are superior to those of the standard sample meeting the national standard, and particularly, the yield strength and tensile strength of the sample after the longitudinal damage repair are respectively 25Mpa and 14Mpa higher than those of the standard sample. The mechanical property of the damaged sample repaired by the synchronous powder feeding plasma surfacing process is superior to that of a normal and intact sample which meets the national standard, and the iron-based composite coating for reinforcing the material for the power transmission iron tower has good mechanical property when being used for the power transmission iron tower.
Wherein, the standard sample adopts a national GB6397-86 standard round bar tensile sample, the diameter is 10mm, and the dimensional tolerance is 0.05 mm. The method comprises the steps of turning a 60mm long and 2mm deep longitudinal flaw and a 2mm deep circumferential flaw along the middle of a marked sample to manufacture a simulated damage sample, preparing a tungsten carbide reinforced iron-based composite coating by adopting a plasma surfacing process along the direction of the longitudinal flaw of the simulated damage sample, wherein the repairing is longitudinal repairing, preparing the tungsten carbide reinforced iron-based composite coating by adopting the plasma surfacing process along the direction of the circumferential flaw of the simulated damage sample, and the repairing is transverse repairing.
TABLE 1
Compared with the common Q235 electrochemical corrosion, the tungsten carbide reinforced iron-based composite coating prepared on the Q235 substrate in the embodiment has the corrosion resistance of 550 omega for the Q235 substrate with the composite coating and 300 omega for the common Q235 corrosion, and data show that the tungsten carbide reinforced iron-based composite coating has obvious corrosion resistance and mechanical property.
The above description is only an embodiment of the present invention, and is not intended to limit the present invention. Various modifications and alterations to this invention will become apparent to those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the scope of the claims of the present invention.
Claims (10)
1. An iron-based composite coating for reinforcing materials for transmission towers is characterized by comprising:
25 wt.% to 35 wt.% tungsten carbide powder and 65 wt.% to 75 wt.% Fe55 iron-based alloy powder, in weight percent.
2. The iron-based composite coating of claim 1, wherein the tungsten carbide powder is 30 wt.%, and the Fe55 iron-based alloy powder is 70 wt.%.
3. A preparation method of an iron-based composite coating for reinforcing materials for a power transmission tower is characterized by comprising the following steps:
mixing tungsten carbide powder and iron-based alloy powder according to weight percentage, wherein the tungsten carbide powder accounts for 25-35 wt%, and the Fe55 iron-based alloy powder accounts for 65-75 wt%;
grinding the mixed tungsten carbide powder and Fe55 iron-based alloy powder;
drying the ground tungsten carbide powder and Fe55 iron-based alloy powder, and taking the dried tungsten carbide powder and Fe55 iron-based alloy powder as original powder for plasma surfacing;
pretreating the surface of the substrate;
and synthesizing a composite coating on the surface of the pretreated substrate by a synchronous powder feeding plasma surfacing process.
4. The method of claim 3, wherein the mixed tungsten carbide powder and Fe55 Fe-based alloy powder are ground for 30 minutes or more.
5. The method for preparing the iron-based composite coating according to claim 3, wherein the pre-treating the surface of the substrate comprises:
carrying out sand blasting treatment on the surface of the matrix;
cleaning the surface of the substrate subjected to sand blasting by using industrial alcohol;
and (3) drying the cleaned matrix in an electrothermal blowing dryer.
6. The method of claim 3, wherein the drying temperature is 60 ℃ and the drying time is 1.5 hours or more when the milled tungsten carbide powder and the Fe55 Fe-based alloy powder are dried.
7. The method of claim 3, wherein the mixed tungsten carbide powder and Fe55 Fe-based alloy powder are placed in a GMS jar mill, and the mixed tungsten carbide powder and Fe55 Fe-based alloy powder are ground.
8. The preparation method of the iron-based composite coating according to claim 3, wherein when the coating is synthesized on the surface of the substrate by adopting a synchronous powder feeding plasma surfacing process, the main arc current is 130A-140A.
9. The preparation method of the iron-based composite coating according to claim 3, wherein when the composite coating is synthesized on the surface of the substrate by adopting a synchronous powder feeding plasma surfacing process, the moving speed of a plasma welding gun is 100mm/s, the defocusing amount is 50mm, and the size W of a rectangular light spot is 15.7mm to D × pi2。
10. An iron-based composite material for reinforcing materials for power transmission towers, which comprises a substrate, wherein the surface of the substrate is synthesized with the iron-based composite coating of claim 1 or 2.
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| CN112680689A (en) * | 2020-12-09 | 2021-04-20 | 中国南方电网有限责任公司超高压输电公司柳州局 | Composition gradient Ni60-Mo2FeB2Preparation method of composite coating and composite coating |
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