CN108842126B - Metal ceramic coating continuous casting crystallizer copper pipe and preparation method thereof - Google Patents
Metal ceramic coating continuous casting crystallizer copper pipe and preparation method thereof Download PDFInfo
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- 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
- C23C4/129—Flame spraying
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/04—Continuous casting of metals, i.e. casting in indefinite lengths into open-ended moulds
- B22D11/059—Mould materials or platings
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- 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
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- 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
- C23C4/18—After-treatment
Abstract
A metal ceramic coating continuous casting crystallizer copper pipe and a preparation method thereof belong to the technical field of continuous casting crystallizer surface treatment. The method comprises the following steps: straightening the copper pipe to remove oil; starting an HVAF spraying system with air as a combustion improver by using an HVAF inner hole spray gun, carrying out sand blasting preheating, starting a spraying process, igniting and sending spraying material WC-10Co-4Cr powder, and spraying a cermet layer on the preheated copper pipe to obtain a copper pipe with a cermet coating; the surface of the copper pipe is sealed by adopting a three-layer sealing process, and then the surface layer of the copper pipe is solidified, so that the hardness of the obtained metal ceramic coating is HV1200-HV1350, the porosity is less than or equal to 1%, and the binding force between the metal ceramic coating and the copper pipe of the continuous casting crystallizer is more than or equal to 70 MPa. The prepared metal ceramic coating continuous casting crystallizer copper pipe has the advantages of high coating hardness, small brittleness, low porosity and high binding force.
Description
Technical Field
The invention relates to the technical field of continuous casting crystallizer surface treatment, in particular to a metal ceramic coating continuous casting crystallizer copper pipe and a preparation method thereof.
Background
The crystallizer copper pipe is a core part of continuous casting equipment in a steel plant. The molten steel is cooled in a crystallizer, primarily cooled, solidified and formed, and a blank shell with a certain thickness is uniformly formed. The solidification process is carried out under the action of gravity and an external vibration device, and the blank shell and the wall of the crystallizer copper pipe continuously and relatively move. Therefore, the inner surface of the copper pipe of the continuous casting crystallizer has good wear resistance so as to improve the service life. In the method for improving the wear resistance of the inner surface of the copper pipe of the crystallizer, the wear-resistant layer is mainly electroplated at present, but a large amount of waste acid and wastewater is generated in the electroplating process, so that the requirement on environment-friendly equipment is high. With the improvement of steel-making equipment and technology, continuous casting steel-making develops towards high drawing speed, and the wear resistance of an electroplating coating cannot meet the requirement of high drawing speed.
The High Velocity Oxygen Fuel Spray (HVOF) technology was developed in the eighties of the twentieth century, and has been developed for over thirty years so far, which is the most influential Spray technology in the field of thermal spraying. Supersonic flame spraying, using oxygen as combustion improver, burning the liquid (such as kerosene) entering the combustion chamber from a small hole, mixing with oxygen after atomization, igniting to generate strong gas phase reaction, expanding the product violently by the heat energy released by burning, when the expanding gas flows through the Laval nozzle, the flame flow is accelerated by the constraint force of the nozzle to form supersonic high temperature flame flow, and the supersonic high temperature flame flow accelerates the spraying material to the surface of the substrate, thereby forming a high quality coating. Usually, the HVOF fuel comprises kerosene and propane, the flame temperature of the combustion chamber is 2900-3100 ℃, and the flame flow velocity reaches 700-1000 m/s; the method adopts oxygen to support combustion, has high temperature and high cost, easily forms carbonized two substances in the spraying process, can ensure the hardness of the spraying material, but has high brittleness. HVOF spray gun has a large gun body and a long spraying distance, and can only be used for preparing coatings on the outer surface of a workpiece and the inner surface of the workpiece with a large diameter. At present, the inner diameter of the copper pipe of the continuous casting crystallizer can not be basically used for preparing the metal ceramic coating by using an HVOF spray gun.
Disclosure of Invention
The invention provides a metal ceramic coating continuous casting crystallizer copper pipe and a preparation method thereof aiming at the problems of the prior art, and the method adopts Air combustion-supporting supersonic flame spraying, namely an HVAF (high Velocity Air furnace spray) spraying method, and the metal ceramic coating continuous casting crystallizer copper pipe is prepared by using an HVAF inner hole spraying gun. The HVAF inner hole spray gun has the characteristics of small volume, short spray distance, small power and the like, and the coating has high hardness, small brittleness, low porosity and high binding force.
The invention relates to a method for preparing a metal ceramic coating continuous casting crystallizer copper pipe, which adopts an HVAF process and comprises the following process steps:
step 1: copper pipe pretreatment
(1) Straightening the surface of the copper pipe: straightening the copper pipe to obtain a straightened copper pipe;
(2) copper pipe surface degreasing: deoiling and purifying the straightened copper pipe to obtain a deoiled and purified copper pipe;
step 2: sand blasting and preheating for copper pipe surface
Starting an HVAF spraying system by using an HVAF inner hole spray gun, setting a sand blasting process program, igniting and sending sand blasting powder, starting a robot motion track program to perform sand blasting coarsening on the inner surface of the copper pipe after oil removal and purification, and simultaneously preheating to obtain the preheated copper pipe. Wherein the preheating temperature of the copper pipe is 90-120 ℃, and the surface roughness Ra is 2.5-4 μm;
wherein, the technological parameters of sand blasting and preheating are as follows: the sand blasting powder is white corundum sand with the granularity of 180-240 meshes;
the sand blasting process procedure of the HVAF spraying system comprises the following steps: the combustion improver is air, the air pressure is 98-102psi, the fuel is propane or propylene, the air pressure of the fuel is 102-106psi, the flow rate of nitrogen is 18-25L/min, the flow rate of hydrogen is 15-25L/min, the spraying distance is 50-110mm, and the powder conveying amount is 100-150 g/min;
and step 3: copper pipe surface spraying
Starting an HVAF spraying system by using an HVAF inner hole spray gun, setting a spraying process program, igniting and conveying a spraying material, and spraying a metal ceramic layer on the preheated copper pipe to obtain a copper pipe with a metal ceramic coating; wherein, the spraying material adopts WC-10Co-4Cr powder, and the granularity of the powder is 2-10 mu m; in the spraying process, the temperature of the copper pipe is controlled to be less than or equal to 180 ℃; the spraying thickness is 0.05-0.2 mm;
the spraying process program of the HVAF spraying system comprises the following steps: the combustion improver is air, the air pressure is 95-100psi, the fuel is propane or propylene, the air pressure of the fuel is 98-102psi, the flow of nitrogen is 18-25L/min, the flow of hydrogen is 15-25L/min, the spraying distance is 50-110mm, and the powder feeding amount is 80-120 g/min;
and 4, step 4: inner surface sealing hole of copper pipe
Adopting a three-layer hole sealing process to carry out hole sealing treatment to obtain a copper pipe after hole sealing; the dosage of each layer of hole sealing agent is 6.0-7.4 m2/L；
Wherein, the first layer is a bottom layer hole sealing agent and is evenly sprayed on the surface of the copper pipe of the metal ceramic coating by a spray gun; the bottom layer hole sealing agent is an aqueous solution and comprises the following components in percentage by mass: 0.5-2% of zirconium oxide, 0.5-2% of rare earth and the balance of water;
the second layer is a middle layer sealant which is directly coated on the surface of the bottom layer sealant, and the middle layer sealant contains the following components in percentage by mass: 40-80% of chromic anhydride, 5-15% of zinc oxide and the balance of water;
the third layer is a surface layer sealing agent and is directly coated on the surface of the middle layer sealing agent, and the surface layer sealing agent comprises the following components in percentage by mass: chromic anhydride 20-40%, zinc oxide 2-10%, phosphoric acid 20-40%, and water in balance;
and 5: copper pipe surface layer solidification
Heating the copper pipe after hole sealing to 260-330 ℃ at the heating rate of 1-3 ℃/min, preserving the heat for 2-3h, cooling to room temperature after 20-30h to obtain the metal ceramic coating continuous casting crystallizer copper pipe, and performing clean packaging.
In the step 1(1), the straightening adopts a press machine, the tolerance of the curvature of one side of the cambered surface of the straightened copper pipe requires the radius of +/-1 mm, and the flatness of one side of the straight surface is less than 1 mm.
In the step 1(2), the oil removing and purifying process comprises the following steps: the straightened copper tube surface is degreased by industrial alcohol, and the inner surface to be sprayed is purified by acetone before spraying.
In the step 3, the WC-10Co-4Cr powder is agglomerated sintered cobalt-chromium-coated tungsten carbide powder, specifically, Co accounts for 10% of the total mass percent, and Cr accounts for 4% of the total mass percent.
In the step 5, the equipment adopted for curing the surface layer is an electric heating furnace.
The continuous casting crystallizer copper pipe with the metal ceramic coating is prepared according to the preparation method.
The hardness of the metal ceramic coating of the continuous casting crystallizer copper pipe is HV1200-HV1350, the porosity is less than or equal to 1%, and the binding force between the metal ceramic coating and the continuous casting crystallizer copper pipe is more than or equal to 70 MPa.
The invention relates to a metal ceramic coating continuous casting crystallizer copper pipe and a preparation method thereof, which have the following beneficial effects:
1. the performance characteristics of the cermet coating of the continuous casting crystallizer copper pipe with the cermet coating prepared by the invention are as follows:
(1) the high melting point is easy to withstand the operation temperature of the template; (2) high hardness (HRC 73 or HV 1350); (3) has chemical inertia and stability, and does not react with powder (casting powder) or molten steel; (4) the porosity is low, and the pollution of metal copper to steel billets is reduced; (5) the change of heat transfer to the copper pipe matrix can be ignored;
2. the invention adopts HVAF preparation technology, which is characterized in that: the HVAF fuel comprises propylene and propane, the flame temperature of the combustion chamber is 1600-1900 ℃, and the flame flow velocity reaches 900-1200 m/s. The HVAF flame flow temperature is lower than that of HVOF, WC is hardly decomposed when preparing WC series ceramic coating, and brittle phase W in the coating is avoided2And C, forming. The HVAF flame flow velocity is higher than the HVOF, and the impact force is stronger. Therefore, the metal ceramic coating continuous casting crystallizer copper pipe prepared by HVAF spraying has high hardness, small brittleness, low porosity and high binding force.
3. The method can meet the requirements of wear resistance, high temperature resistance and corrosion resistance of the surface of the copper pipe of the crystallizer at high drawing speed, and can prolong the replacement period of the copper pipe of the crystallizer and reduce the labor intensity while improving the steel passing amount of continuous casting operation.
4. The copper pipe surface layer is solidified, the heating rate and the cooling rate are limited, and the copper pipe surface layer has the advantage of preventing particles from being decomposed in deposition to form a brittle coating due to overhigh temperature.
5. According to the invention, the copper pipe sprayed by HVAF is subjected to hole sealing treatment and is combined with curing treatment, so that the porosity of the coating is further reduced, and the compressive stress between the coating and the substrate is released. The two are combined to form a high-quality coating with high compact binding force.
6. In the spraying process of the metal ceramic coating continuous casting crystallizer copper pipe prepared by the invention, the temperature is controlled below 180 ℃ so as to prevent the coating from being overheated and the bonding force of the coating from being reduced because the pressure stress is not released in time.
Detailed Description
The present invention will be described in further detail with reference to examples.
Example 1
A method for preparing R6-160-900 metal ceramic coating continuous casting crystallizer copper tube adopts HVAF technique, and its technique steps are as follows:
step 1:
(1) straightening the surface of the copper pipe: and (3) straightening the copper pipe by using a press machine, wherein the curved surface of one side of the cambered surface requires 6000mm +/-1 mm, and the flatness of one side of the straight surface is less than 1mm, so that the straightened copper pipe is obtained.
(2) Copper pipe surface degreasing: the straightened copper tube surface is degreased by using industrial alcohol, and the surface to be sprayed is purified by using acetone before spraying.
Step 2: sand blasting and preheating for copper pipe surface
Setting a robot program, starting an HVAF spraying system by using an HVAF inner hole spray gun, igniting and sending sand blasting powder, wherein the sand blasting powder adopts 180-240 meshes of white corundum sand, and the copper pipe is preheated while the surface of the copper pipe is roughened by sand blasting, and the preheating temperature is 90-120 ℃. The surface roughness Ra after sand blasting is 2.5-4 μm. The blasting and preheating parameters are as follows:
TABLE 1 copper pipe surface Sand blasting and preheating Process parameters
And step 3: copper pipe surface spraying
The spraying powder is WC-10Co-4Cr powder with the granularity of 2-10 μm and the spraying thickness of the crystallizer copper tube of 0.05-0.2 mm. The temperature of the crystallizer copper pipe in the spraying process is controlled below 180 ℃, and the related spraying parameters are as follows:
TABLE 2 spray coating Process parameters
And 4, step 4: copper pipe surface sealing hole
Adopting a three-layer hole sealing process to carry out hole sealing treatment to obtain a copper pipe after hole sealing;
the No. 1 bottom layer sealant is as follows: mixing 1% of zirconium oxide, 1% of rare earth and the balance of water, dissolving the zirconium oxide and the rare earth in the water, uniformly spraying a metal ceramic coating on the surface of a copper pipe by using a spray gun, drying, and coating a No. 2 hole sealing agent; the 2# hole sealing agent is 50 wt.% of chromic anhydride, 10 wt.% of zinc oxide and the balance of water, the 3# hole sealing agent is smeared after the 2# hole sealing agent is dried, and the 3# hole sealing agent raw material is weighed; the 3# hole sealing agent comprises raw materials, 25 wt.% of chromic anhydride, 5 wt.% of zinc oxide, 25 wt.% of phosphoric acid and the balance of water, wherein the raw materials are mixed, the coated coating of the 2# hole sealing agent is directly coated, and the using amount of each layer of hole sealing agent is 6.0-7.4 m2/L。
And 5: copper pipe surface layer solidification
In an electric heating furnace, the temperature is raised to 300 ℃ from room temperature for 3 hours, and after the temperature is kept for 2 hours, the temperature is cooled to room temperature for 25 hours.
Step 6: copper pipe cleaning package
The copper pipe is processed completely by a reasonable tool, and the cold surface screw hole and the thermocouple hole of the copper pipe are processed emphatically. The copper pipe is packaged by selecting a proper packaging material and placed in a firm wooden box, and the copper pipe is fixed and cannot move in the wooden box.
The following are the performance tests of the continuous casting crystallizer copper tube with the cermet coating prepared in the embodiment, and the results are compared with the continuous casting crystallizer copper tubes with other process conditions, and the results are as follows:
TABLE 3 comparison of the copper tube performance of the crystallizer with cermet coating of this patent and that of other continuous casting processes
Application case 1
After a steel mill uses the cermet coating continuous casting crystallizer copper pipe prepared in the embodiment 1 of the invention for 18 years and 2 months, the cermet coating continuous casting crystallizer copper pipe has the following advantages:
1. the maximum abrasion loss is 0.4mm, which is far less than the abrasion loss of 2-3mm when the electroplated copper pipe passes through 7500 tons of steel;
2. because almost no abrasion exists, the taper of the narrow-face copper pipe is well kept;
3. the workload of disassembly, assembly and repair is reduced;
4. the service life of the copper pipe is prolonged.
Application case 2
After a steel mill uses the cermet coating continuous casting crystallizer copper pipe prepared in example 1 of the present invention for 18 years and 5 months, the cermet coating continuous casting crystallizer copper pipe of the present invention has the following advantages:
1. the average steel passing amount is improved by 4.5 times;
2. the average use time of a single copper pipe is 2 times, the service life reaches 8 ten thousand tons, and the service life is improved by 11 times;
3. the shape of the corner of the casting blank is stable, and cracks are greatly reduced;
4. the heat flow is stable, and the broken edge is reduced.
Example 2
A method for preparing R7-162-1000 metal ceramic coating continuous casting crystallizer copper tube adopts HVAF technique, and the technique steps are as follows:
step 1:
(1) straightening the surface of the copper pipe: and (3) straightening the copper pipe by using a press machine, wherein the curved surface of one side of the cambered surface requires 6000mm +/-1 mm, and the flatness of one side of the straight surface is less than 1mm, so that the straightened copper pipe is obtained.
(2) Copper pipe surface degreasing: the straightened copper tube surface is degreased by using industrial alcohol, and the surface to be sprayed is purified by using acetone before spraying.
Step 2: sand blasting and preheating for copper pipe surface
Setting a robot program, starting an HVAF spraying system by using an HVAF inner hole spray gun, igniting and sending sand blasting powder, wherein the sand blasting powder adopts 180-240 meshes of white corundum sand, and the copper pipe is preheated while the surface of the copper pipe is roughened by sand blasting, and the preheating temperature is 90-120 ℃. The surface roughness Ra after sand blasting is 2.5-4 μm. The blasting and preheating parameters are as follows:
TABLE 4 copper pipe surface Sand blasting and preheating Process parameters
And step 3: copper pipe surface spraying
The spraying powder is WC-10Co-4Cr powder with the granularity of 2-10 μm and the spraying thickness of the crystallizer copper tube of 0.05-0.2 mm. The temperature of the crystallizer copper pipe in the spraying process is controlled below 180 ℃, and the related spraying parameters are as follows:
TABLE 5 spray coating Process parameters
And 4, step 4: copper pipe surface sealing hole
Adopting a three-layer hole sealing process to carry out hole sealing treatment to obtain a copper pipe after hole sealing;
the No. 1 bottom layer sealant is as follows: mixing zirconium oxide and rare earth, dissolving the zirconium oxide and the rare earth in water, uniformly spraying a metal ceramic coating on the surface of a copper plate by using a spray gun, drying, then smearing a 2# hole sealing agent, wherein the 2# hole sealing agent is 80 wt.% chromic anhydride, 5 wt.% zinc oxide and the balance is water, drying, then smearing a 3# hole sealing agent, weighing a 3# hole sealing agent raw material, the 3# hole sealing agent contains 40 wt.% chromic anhydride, 10 wt.% zinc oxide, 40 wt.% phosphoric acid and the balance is water, mixing the 3# hole sealing agent raw material, directly smearing the 2# hole sealing agent smeared coating, and the using amount of each layer of hole sealing agent is 6.0m2/L。
And 5: copper pipe surface layer solidification
In an electric heating furnace, the temperature is raised to 300 ℃ from room temperature for 2 hours, and after the temperature is preserved for 3 hours, the temperature is cooled to room temperature for 20 hours.
Step 6: copper pipe cleaning package
The copper pipe is processed completely by a reasonable tool, and the cold surface screw hole and the thermocouple hole of the copper pipe are processed emphatically. The copper pipe is packaged by selecting a proper packaging material and placed in a firm wooden box, and the copper pipe is fixed and cannot move in the wooden box.
Claims (6)
1. A method for preparing a metal ceramic coating continuous casting crystallizer copper pipe is characterized by adopting an HVAF process, and the process steps are as follows:
step 1: copper pipe pretreatment
(1) Straightening the surface of the copper pipe: straightening the copper pipe to obtain a straightened copper pipe;
(2) copper pipe surface degreasing: deoiling and purifying the straightened copper pipe to obtain a deoiled and purified copper pipe;
step 2: sand blasting and preheating for copper pipe surface
Starting an HVAF spraying system by using an HVAF inner hole spray gun, setting a sand blasting process program, igniting and sending sand blasting powder, starting a robot motion track program to perform sand blasting coarsening on the inner surface of the copper pipe after oil removal and purification, and simultaneously preheating to obtain a preheated copper pipe; wherein the preheating temperature of the copper pipe is 90-120 ℃, and the surface roughness Ra is 2.5-4 μm;
wherein, the technological parameters of sand blasting and preheating are as follows: the sand blasting powder is white corundum sand with the granularity of 180-240 meshes;
the sand blasting process procedure of the HVAF spraying system comprises the following steps: the combustion improver is air, the air pressure is 98-102psi, the fuel is propane or propylene, the air pressure of the fuel is 102-106psi, the flow rate of nitrogen is 18-25L/min, the flow rate of hydrogen is 15-25L/min, the spraying distance is 50-110mm, and the powder conveying amount is 100-150 g/min;
and step 3: copper pipe surface spraying
Starting an HVAF spraying system by using an HVAF inner hole spray gun, setting a spraying process program, igniting and conveying a spraying material, and spraying a metal ceramic layer on the preheated copper pipe to obtain a copper pipe with a metal ceramic coating; wherein, the spraying material adopts WC-10Co-4Cr powder, and the granularity of the powder is 2-10 mu m; in the spraying process, the temperature of the copper pipe is controlled to be less than or equal to 180 ℃; the spraying thickness is 0.05-0.2 mm; the WC-10Co-4Cr powder is agglomerated sintered cobalt-chromium-coated tungsten carbide powder, and specifically comprises 10% of Co element and 4% of Cr element by mass;
the spraying process program of the HVAF spraying system comprises the following steps: the combustion improver is air, the air pressure is 95-100psi, the fuel is propane or propylene, the air pressure of the fuel is 98-102psi, the flow of nitrogen is 18-25L/min, the flow of hydrogen is 15-25L/min, the spraying distance is 50-110mm, and the powder feeding amount is 80-120 g/min;
and 4, step 4: inner surface sealing hole of copper pipe
Adopting a three-layer hole sealing process to carry out hole sealing treatment to obtain a copper pipe after hole sealing; the dosage of each layer of hole sealing agent is 6.0-7.4 m2/L；
Wherein, the first layer is a bottom layer hole sealing agent and is evenly sprayed on the surface of the copper pipe of the metal ceramic coating by a spray gun; the bottom layer hole sealing agent is an aqueous solution and comprises the following components in percentage by mass: 0.5-2% of zirconium oxide, 0.5-2% of rare earth and the balance of water;
the second layer is a middle layer sealant which is directly coated on the surface of the bottom layer sealant, and the middle layer sealant contains the following components in percentage by mass: 40-80% of chromic anhydride, 5-15% of zinc oxide and the balance of water;
the third layer is a surface layer sealing agent and is directly coated on the surface of the middle layer sealing agent, and the surface layer sealing agent comprises the following components in percentage by mass: chromic anhydride 20-40%, zinc oxide 2-10%, phosphoric acid 20-40%, and water in balance;
and 5: copper pipe surface layer solidification
Heating the copper pipe after hole sealing to 260-330 ℃ at a heating rate of 1-3 ℃/min, preserving heat for 2-3h, cooling to room temperature after 20-30h to obtain a metal ceramic coating continuous casting crystallizer copper pipe, and performing clean packaging;
wherein the hardness of the metal ceramic coating is HV1200-HV1350, the porosity is less than or equal to 1%, and the binding force between the metal ceramic coating and the continuous casting crystallizer copper pipe is more than or equal to 70 MPa.
2. The method for preparing the copper tube of the metal ceramic coating continuous casting crystallizer of claim 1, wherein in the step 1(1), the straightening adopts a press machine, the tolerance of the curved surface of the cambered side of the straightened copper tube requires the radius of +/-1 mm, and the flatness of the straight side is less than 1 mm.
3. The method for preparing the cermet coating continuous casting crystallizer copper tube according to claim 1, wherein in the step 1(2), the degreasing and purifying process comprises: the straightened copper tube surface is degreased by industrial alcohol, and the inner surface to be sprayed is purified by acetone before spraying.
4. The method for preparing a cermet coating continuous casting crystallizer copper tube as defined in claim 1, wherein in said step 5, the apparatus used for solidifying said surface layer is an electric heating furnace.
5. A continuous casting crystallizer copper tube with a metal ceramic coating, which is prepared by the preparation method of any one of claims 1 to 4.
6. The cermet coating continuous casting crystallizer copper tube of claim 5, wherein the cermet coating has a hardness of HV1200 to HV1350 and a porosity of not more than 1%, and the binding force between the cermet coating and the continuous casting crystallizer copper tube is not less than 70 MPa.
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| CN109266994A (en) * | 2018-11-27 | 2019-01-25 | 广东省新材料研究所 | A kind of preparation method of the outer surface supersonic spray coating coating of complex parts |
| CN109321859A (en) * | 2018-11-27 | 2019-02-12 | 广东省新材料研究所 | A kind of metal surface pre-treating method |
| US11859757B2 (en) | 2020-12-04 | 2024-01-02 | Caterpillar Inc. | Fluid conduits with selectively coated surfaces |
| CN116200734B (en) * | 2023-03-14 | 2024-02-02 | 广东省科学院新材料研究所 | Method for improving corrosion resistance of tungsten carbide-cobalt coating, corrosion resistant coating and application thereof |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102794417A (en) * | 2011-05-24 | 2012-11-28 | 宝山钢铁股份有限公司 | Metal ceramic coating on surface of copper plate of continuous casting mold and manufacturing process for metal ceramic coating |
| CN103614687A (en) * | 2013-11-22 | 2014-03-05 | 西峡龙成特种材料有限公司 | Preparation technique of continuous casting crystallizer copper plate surface cermet coating |
| CN103614724A (en) * | 2013-11-22 | 2014-03-05 | 西峡龙成特种材料有限公司 | Preparation technique of continuous casting crystallizer copper plate surface cermet coating |
-
2018
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102794417A (en) * | 2011-05-24 | 2012-11-28 | 宝山钢铁股份有限公司 | Metal ceramic coating on surface of copper plate of continuous casting mold and manufacturing process for metal ceramic coating |
| CN103614687A (en) * | 2013-11-22 | 2014-03-05 | 西峡龙成特种材料有限公司 | Preparation technique of continuous casting crystallizer copper plate surface cermet coating |
| CN103614724A (en) * | 2013-11-22 | 2014-03-05 | 西峡龙成特种材料有限公司 | Preparation technique of continuous casting crystallizer copper plate surface cermet coating |
Non-Patent Citations (1)
| Title |
|---|
| HVAF和HVOF喷涂WC-CoCr涂层的组织性能对比;李勇 等;《热力发电》;20150430;第44卷(第4期);第99页 * |
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