CN112176273A - Diffusion welding process for thermal spraying coating of crystallizer copper plate - Google Patents
Diffusion welding process for thermal spraying coating of crystallizer copper plate Download PDFInfo
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- CN112176273A CN112176273A CN202010964542.6A CN202010964542A CN112176273A CN 112176273 A CN112176273 A CN 112176273A CN 202010964542 A CN202010964542 A CN 202010964542A CN 112176273 A CN112176273 A CN 112176273A
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- 239000011248 coating agent Substances 0.000 title claims abstract description 122
- 238000000576 coating method Methods 0.000 title claims abstract description 122
- 239000010949 copper Substances 0.000 title claims abstract description 83
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 title claims abstract description 79
- 229910052802 copper Inorganic materials 0.000 title claims abstract description 79
- 238000009792 diffusion process Methods 0.000 title claims abstract description 55
- 238000003466 welding Methods 0.000 title claims abstract description 53
- 238000007751 thermal spraying Methods 0.000 title claims abstract description 47
- 238000000034 method Methods 0.000 title claims abstract description 42
- 230000008569 process Effects 0.000 title claims abstract description 30
- 238000005507 spraying Methods 0.000 claims abstract description 26
- 239000000843 powder Substances 0.000 claims abstract description 17
- 238000001816 cooling Methods 0.000 claims abstract description 15
- 239000000463 material Substances 0.000 claims abstract description 12
- 239000011261 inert gas Substances 0.000 claims abstract description 8
- 238000004321 preservation Methods 0.000 claims abstract description 8
- 238000007599 discharging Methods 0.000 claims abstract description 7
- 230000004913 activation Effects 0.000 claims description 10
- 229910000831 Steel Inorganic materials 0.000 claims description 7
- 239000010959 steel Substances 0.000 claims description 7
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 6
- 239000004576 sand Substances 0.000 claims description 6
- 238000005202 decontamination Methods 0.000 claims description 3
- 230000003588 decontaminative effect Effects 0.000 claims description 3
- 238000010438 heat treatment Methods 0.000 claims description 3
- 229910052742 iron Inorganic materials 0.000 claims description 3
- 238000009749 continuous casting Methods 0.000 abstract description 23
- 239000011159 matrix material Substances 0.000 abstract description 17
- 238000005260 corrosion Methods 0.000 abstract description 11
- 230000007797 corrosion Effects 0.000 abstract description 11
- 238000001953 recrystallisation Methods 0.000 description 8
- 238000009713 electroplating Methods 0.000 description 7
- 238000005516 engineering process Methods 0.000 description 7
- 230000008439 repair process Effects 0.000 description 7
- 230000003647 oxidation Effects 0.000 description 6
- 238000007254 oxidation reaction Methods 0.000 description 6
- 239000000758 substrate Substances 0.000 description 6
- 238000004381 surface treatment Methods 0.000 description 5
- 230000000694 effects Effects 0.000 description 4
- 238000004372 laser cladding Methods 0.000 description 4
- 239000000956 alloy Substances 0.000 description 3
- 229910045601 alloy Inorganic materials 0.000 description 3
- 230000002035 prolonged effect Effects 0.000 description 3
- 238000005299 abrasion Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 239000007789 gas Substances 0.000 description 2
- 230000005484 gravity Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000013021 overheating Methods 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 238000007670 refining Methods 0.000 description 2
- 229910020630 Co Ni Inorganic materials 0.000 description 1
- 229910002440 Co–Ni Inorganic materials 0.000 description 1
- 229910017709 Ni Co Inorganic materials 0.000 description 1
- 229910003267 Ni-Co Inorganic materials 0.000 description 1
- 229910003271 Ni-Fe Inorganic materials 0.000 description 1
- 229910003262 Ni‐Co Inorganic materials 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
Classifications
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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
- C23C4/123—Spraying molten metal
-
- 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
- B23K20/00—Non-electric welding by applying impact or other pressure, with or without the application of heat, e.g. cladding or plating
- B23K20/02—Non-electric welding by applying impact or other pressure, with or without the application of heat, e.g. cladding or plating by means of a press ; Diffusion bonding
-
- 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
- B23K20/00—Non-electric welding by applying impact or other pressure, with or without the application of heat, e.g. cladding or plating
- B23K20/26—Auxiliary equipment
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C19/00—Alloys based on nickel or cobalt
- C22C19/03—Alloys based on nickel or cobalt based on nickel
- C22C19/05—Alloys based on nickel or cobalt based on nickel with chromium
- C22C19/051—Alloys based on nickel or cobalt based on nickel with chromium and Mo or W
- C22C19/055—Alloys based on nickel or cobalt based on nickel with chromium and Mo or W with the maximum Cr content being at least 20% but less than 30%
-
- 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
- C22C30/02—Alloys containing less than 50% by weight of each constituent containing copper
-
- 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
- C23C4/02—Pretreatment of the material to be coated, e.g. for coating on selected surface areas
-
- 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
-
- 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
- C23C4/14—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge characterised by the method of spraying for coating elongate material
-
- 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
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Physics & Mathematics (AREA)
- Plasma & Fusion (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Coating By Spraying Or Casting (AREA)
- Continuous Casting (AREA)
Abstract
The invention discloses a diffusion welding process for a thermal spraying coating of a crystallizer copper plate, which comprises the following steps: copper plate spraying pretreatment → coating material selection → thermal spraying coating diffusion welding → cooling → discharging. Wherein, the coating material is selected as follows: the thermal spraying powder comprises 0.3-0.8% of C, 10-20% of Cr, 7-10% of Si, 4-6% of B, 5-10% of Cu, 2-5% of Mo, 1-2% of Al and the balance of Ni; the thermal spraying coating diffusion welding comprises the following steps: and filling inert gas into the heat preservation furnace, and performing diffusion welding treatment on the coating at a certain temperature for a certain time. The invention can effectively form metallurgical bonding between the crystallizer copper plate matrix and the thermal spraying coating, and the coating has good performance, excellent thermal conductivity, wear resistance and corrosion resistance, and prolongs the service life of the continuous casting crystallizer copper plate.
Description
Technical Field
The invention relates to the field of metallurgical industry, in particular to a diffusion welding process for a hot spraying coating of a copper plate of a continuous casting crystallizer.
Background
Continuous casting is one of advanced technologies in the field of modern metallurgical industry, and a continuous casting crystallizer copper plate is core equipment of a continuous casting machine set, and the quality of the continuous casting crystallizer copper plate directly influences the quality of a steel billet and the production efficiency of a continuous casting machine. With the development of the continuous casting industry to high speed and large scale, the requirement for the crystallizer copper plate is higher and higher: firstly, the crystallizer copper plate is required to have good thermal conductivity, which is a precondition for improving the production efficiency; then, the alloy is required to have stronger deformation resistance and good wear resistance and corrosion resistance, which are necessary conditions for prolonging the service life; therefore, the surface of the continuously cast crystalline copper plate needs to be treated so that the properties thereof satisfy the above requirements.
The traditional method for treating the working surface of the copper plate of the continuous casting crystallizer is an electroplating technology, and the development history mainly focuses on the improvement of electroplating materials, namely the initial Cr electroplating, the Ni-Fe electroplating, and the current Ni-Co electroplating, Co-Ni electroplating and the like. The electroplating technology causes environmental pollution, the period is long, the defects of the electroplated layer are overcome, and the like, so that the requirements of long service life and high efficiency of modern steel are difficult to meet. Therefore, various treatment methods are carried out on the working surface of the copper plate of the crystallizer: such as welding techniques, thermal spraying techniques, laser cladding techniques, and the like. The crystallizer copper plate matrix is easy to deform by using a welding technology, and the bonding strength of the coating and the matrix is poor; by using the laser cladding technology, although a metallurgical bonding repair layer can be obtained, the preparation of a defect-free repair layer on a copper substrate is very difficult (thermal conductivity and light reflection rate) due to the characteristics of the laser cladding method; therefore, the method for repairing the side surface of the short-side copper plate of the crystallizer by laser cladding is not industrialized; the repair layer obtained by the thermal spraying technology is mechanically combined with the surface of a copper matrix, so that the repair layer is easy to peel off in use, and the obtained coating has poor stability, so that the batch application of the thermal spraying technology on the working surface of the copper plate of the continuous casting crystallizer is seriously influenced.
Disclosure of Invention
The invention aims to solve the problem of providing a diffusion welding process for the thermal spraying coating of the crystallizer copper plate, which can effectively form metallurgical bonding between the crystallizer copper plate matrix and the thermal spraying coating, has good coating performance, excellent thermal conductivity and wear and corrosion resistance, and prolongs the service life of the continuous casting crystallizer copper plate. The diffusion welding process method for the coating surface of the copper plate of the continuous casting crystallizer is suitable for surface treatment of a new continuous casting crystallizer copper plate and repair of the surface of an old continuous casting crystallizer copper plate, and industrialization of the hot spraying coating of the copper plate of the crystallizer with metallurgical bonding becomes possible.
The invention relates to a diffusion welding process for a thermal spraying coating of a crystallizer copper plate, which comprises the following steps: copper plate spraying pretreatment → coating material selection → thermal spraying coating diffusion welding → cooling → discharging.
The invention relates to a diffusion welding process for a thermal spraying coating of a crystallizer copper plate, which comprises the following specific steps of:
(1) copper plate spraying pretreatment: steel sand and iron sand are adopted for carrying out activation treatment such as oil removal and decontamination;
(2) selecting a coating material: the thermal spraying powder comprises 0.3-0.8% of C, 10-20% of Cr, 7-10% of Si, 4-6% of B, 5-10% of Cu, 2-5% of Mo, 1-2% of Al and the balance of Ni;
(3) thermal spraying: spraying the copper plate by adopting supersonic spraying equipment, wherein the thickness of the coating is 0.5-1.5 mm;
(4) thermal spray coating diffusion welding: filling inert gas into the heat preservation furnace, and performing diffusion welding treatment on the coating at a certain temperature for a certain time;
(5) and (3) cooling: cooling the copper plate along with the furnace;
(6) and (4) discharging.
Further, after the activation treatment in the step (1), the roughness of the surface of the copper plate is Ra 8-10.
Further, the material particle size of the thermal spray powder in the step (2) is 10-38 um.
Further, the thermal spraying coating diffusion welding in the step (4): the heat treatment temperature range is 700 ℃ and 800 ℃, and the heat preservation time is 60-90 min.
Further, when the step (5) is cooled, the cooling speed is 300 ℃/h.
The method comprises the following steps: the copper plate spraying pretreatment has the following effects: the activation treatment can effectively increase the contact area of the coating and the substrate, and is beneficial to the spraying and diffusion welding.
Step two: the selected thermal spraying powder components have higher recrystallization temperature and strong abrasion resistance and corrosion resistance, so that the finally obtained coating also has the same performance as the powder.
Step three: the thickness of the coating is 0.5-1.5, which does not affect the heat conductivity, and the copper plate has good heat conductivity, so the product has good heat conductivity.
Step four: the principle of diffusion welding is as follows: under a certain temperature, through the self gravity of the coating, after a period of time, the metallurgical bonding is formed between the coating and the copper plate matrix and between the coating and the coating through continuous diffusion and mutual permeation; the inert gas serves to protect and prevent oxidation.
Step five: the copper plate is cooled along with the furnace, so that the stress in the copper matrix and the coating can be effectively removed.
The crystallizer copper plate obtained by the thermal spraying coating diffusion welding process has good thermal conductivity, stronger deformation resistance and good wear resistance and corrosion resistance: firstly, the Cr content in the thermal spraying powder exceeds 10 percent, so that the oxidation resistance, the wear resistance, the hardness and the red hardness of a coating can be enhanced; secondly, Mo element in the thermal spraying powder has the function of refining grains, so that the overheating tendency of the coating can be reduced, and the strength, hardness and thermal stability of the coating are improved; thirdly, due to the higher strength of the coating and the effect of Mo element on grain refinement, the deformation degree and the stored energy are correspondingly reduced, the smaller the recrystallization driving force is, the higher the recrystallization temperature is, and the stable performance of the coating in the use process is; the coating has higher recrystallization temperature, so that when the coating is contacted with molten steel, the internal structure of the coating is prevented from being heated, the performance of the coating is not influenced, and the service life of the coating is ensured; the coating has good oxidation resistance, namely good corrosion resistance, and the service life of the coating is prolonged; the high strength and hardness make the coating wear resistant, and prolong the service life of the coating.
The diffusion welding process for the thermal spraying coating has the advantages that: 1. activation treatment is adopted before spraying, so that the surface of the matrix forms certain roughness, and the diffusion welding is facilitated; 2. inert gas is used as shielding gas in the diffusion welding process, so that the copper matrix and the coating are prevented from being oxidized; 3. the coating is processed by diffusion welding, so that the crystallizer copper plate obtains a coating which forms metallurgical bonding with the matrix, and the coating cannot be peeled off in use; and the size of the sprayed layer is not limited; 4. the selection of the thermal spraying powder ensures that the coating has high strength, high wear resistance, high deformation resistance and higher temperature of a re-crystallizer, thereby greatly prolonging the service life of the coating.
In a word, the continuous casting crystallizer copper plate coating obtained by the thermal spraying coating diffusion welding process is metallurgically bonded with the copper substrate, and meanwhile, the coating has stable performance and excellent thermal conductivity and wear and corrosion resistance. Therefore, the diffusion welding process method for the coating surface of the copper plate of the continuous casting crystallizer is suitable for the surface treatment of the new copper plate of the continuous casting crystallizer and the repair of the surface of the old copper plate of the continuous casting crystallizer, so that the industrialization of the hot spraying coating of the copper plate of the crystallizer with metallurgical bonding becomes possible. The thermal spraying coating diffusion welding process of the invention is applicable to the surface treatment of copper workpieces.
Detailed Description
The invention relates to a diffusion welding process for a thermal spraying coating of a crystallizer copper plate, which comprises the following steps: copper plate spraying pretreatment → coating material selection → thermal spraying coating diffusion welding → cooling → discharging.
The invention relates to a diffusion welding process for a thermal spraying coating of a crystallizer copper plate, which comprises the following specific steps of:
(1) copper plate spraying pretreatment: steel sand and iron sand are adopted for carrying out activation treatment such as oil removal and decontamination;
(2) selecting a coating material: the thermal spraying powder comprises 0.3-0.8% of C, 10-20% of Cr, 7-10% of Si, 4-6% of B, 5-10% of Cu, 2-5% of Mo, 1-2% of Al and the balance of Ni;
(3) thermal spraying: spraying the copper plate by adopting supersonic spraying equipment, wherein the thickness of the coating is 0.5-1.5 mm;
(4) thermal spray coating diffusion welding: filling inert gas into the heat preservation furnace, and performing diffusion welding treatment on the coating at a certain temperature for a certain time;
(5) and (3) cooling: cooling the copper plate along with the furnace;
(6) and (4) discharging.
Wherein, after the activation treatment in the step (1), the roughness of the surface of the copper plate is Ra 8-10.
Wherein, the material granularity of the thermal spraying powder in the step (2) is 10-38 um. This range of particle size allows for easy diffusion and penetration between the coating and the substrate, and between the coating and the coating.
Wherein, the thermal spraying coating diffusion welding in the step (4): the heat treatment temperature range is 700 ℃ and 800 ℃, and the heat preservation time is 60-90 min. Under the temperature and the time, the diffusion and the permeability between the coating and the copper plate matrix and between the coating and the coating are good, so that the metallurgical bonding between the coating and the copper plate matrix is facilitated, and the coating is easy to peel off in use; if the temperature is too high and the heat preservation time is too long, the alloy crystal grains are coarse, and even the overburning phenomenon can occur.
Wherein, when the step (5) is cooled, the cooling speed is 300 ℃/h. The rapid cooling function of the workpiece is to prevent the alloy elements from being separated out, so that the performance of the coating is stable, and the service life of the continuous casting crystallizer copper plate is prolonged. .
The method comprises the following steps: the copper plate spraying pretreatment has the following effects: the activation treatment can effectively increase the contact area of the coating and the substrate, and is beneficial to the spraying and diffusion welding.
Step two: the selected thermal spraying powder components have higher recrystallization temperature and strong abrasion resistance and corrosion resistance, so that the finally obtained coating also has the same performance as the powder.
Step three: the thickness of the coating is 0.5-1.5, which does not affect the heat conductivity, and the copper plate has good heat conductivity, so the product has good heat conductivity.
Step four: the principle of diffusion welding is as follows: under a certain temperature, through the self gravity of the coating, after a period of time, the metallurgical bonding is formed between the coating and the copper plate matrix and between the coating and the coating through continuous diffusion and mutual permeation; the inert gas serves to protect and prevent oxidation.
Step five: the copper plate is cooled along with the furnace, so that the stress in the copper matrix and the coating can be effectively removed.
The crystallizer copper plate obtained by the thermal spraying coating diffusion welding process has good thermal conductivity, stronger deformation resistance and good wear resistance and corrosion resistance: firstly, the Cr content in the thermal spraying powder exceeds 10 percent, so that the oxidation resistance, the wear resistance, the hardness and the red hardness of a coating can be enhanced; secondly, Mo element in the thermal spraying powder has the function of refining grains, so that the overheating tendency of the coating can be reduced, and the strength, hardness and thermal stability of the coating are improved; thirdly, due to the higher strength of the coating and the effect of Mo element on grain refinement, the deformation degree and the stored energy are correspondingly reduced, the smaller the recrystallization driving force is, the higher the recrystallization temperature is, and the stable performance of the coating in the use process is; the coating has higher recrystallization temperature, so that when the coating is contacted with molten steel, the internal structure of the coating is prevented from being heated, the performance of the coating is not influenced, and the service life of the coating is ensured; the coating has good oxidation resistance, namely good corrosion resistance, and the service life of the coating is prolonged; the high strength and hardness make the coating wear resistant, and prolong the service life of the coating.
The diffusion welding process for the thermal spraying coating has the advantages that: 1. activation treatment is adopted before spraying, so that the surface of the matrix forms certain roughness, and the diffusion welding is facilitated; 2. inert gas is used as shielding gas in the diffusion welding process, so that the copper matrix and the coating are prevented from being oxidized; 3. the coating is processed by diffusion welding, so that the crystallizer copper plate obtains a coating which forms metallurgical bonding with the matrix, and the coating cannot be peeled off in use; and the size of the sprayed layer is not limited; 4. the selection of the thermal spraying powder ensures that the coating has high strength, high wear resistance, high deformation resistance and higher temperature of a re-crystallizer, thereby greatly prolonging the service life of the coating.
In a word, the continuous casting crystallizer copper plate coating obtained by the thermal spraying coating diffusion welding process is metallurgically bonded with the copper substrate, and meanwhile, the coating has stable performance and excellent thermal conductivity and wear and corrosion resistance. Therefore, the diffusion welding process method for the coating surface of the copper plate of the continuous casting crystallizer is suitable for the surface treatment of the new copper plate of the continuous casting crystallizer and the repair of the surface of the old copper plate of the continuous casting crystallizer, so that the industrialization of the hot spraying coating of the copper plate of the crystallizer with metallurgical bonding becomes possible. The thermal spraying coating diffusion welding process of the invention is applicable to the surface treatment of copper workpieces.
Claims (6)
1. A diffusion welding process for a thermal spraying coating of a crystallizer copper plate comprises the following steps: copper plate spraying pretreatment → coating material selection → thermal spraying coating diffusion welding → cooling → discharging.
2. The diffusion welding process of claim 1, comprising the steps of:
(1) copper plate spraying pretreatment: steel sand and iron sand are adopted for carrying out activation treatment such as oil removal and decontamination;
(2) selecting a coating material: the thermal spraying powder comprises 0.3-0.8% of C, 10-20% of Cr, 7-10% of Si, 4-6% of B, 5-10% of Cu, 2-5% of Mo, 1-2% of Al and the balance of Ni;
(3) thermal spraying: spraying the copper plate by adopting supersonic spraying equipment, wherein the thickness of the coating is 0.5-1.5 mm;
(4) thermal spray coating diffusion welding: filling inert gas into the heat preservation furnace, and performing diffusion welding treatment on the coating at a certain temperature for a certain time;
(5) and (3) cooling: cooling the copper plate along with the furnace;
(6) and (4) discharging.
3. The diffusion welding process of claim 2, wherein: and (2) after the activation treatment in the step (1), the roughness of the surface of the copper plate is Ra 8-10.
4. The diffusion welding process of claim 2, wherein: the material granularity of the thermal spraying powder in the step (2) is 10-38 um.
5. The diffusion welding process of claim 2, wherein: step (4), diffusion welding of the thermal spraying coating: the heat treatment temperature range is 700 ℃ and 800 ℃, and the heat preservation time is 60-90 min.
6. The diffusion welding process of claim 2, wherein: and (5) when cooling is carried out, the cooling speed is 300 ℃/h.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010964542.6A CN112176273A (en) | 2020-09-15 | 2020-09-15 | Diffusion welding process for thermal spraying coating of crystallizer copper plate |
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|---|---|---|---|
| CN202010964542.6A CN112176273A (en) | 2020-09-15 | 2020-09-15 | Diffusion welding process for thermal spraying coating of crystallizer copper plate |
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| CN112176273A true CN112176273A (en) | 2021-01-05 |
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| CN202010964542.6A Pending CN112176273A (en) | 2020-09-15 | 2020-09-15 | Diffusion welding process for thermal spraying coating of crystallizer copper plate |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113308662A (en) * | 2021-05-26 | 2021-08-27 | 泰尔(安徽)工业科技服务有限公司 | Spraying repair method for short-edge copper plate side surface of continuous casting crystallizer |
| CN113369653A (en) * | 2021-06-16 | 2021-09-10 | 辽宁石油化工大学 | Method for repairing arc ablation pit of bottom plate of metallurgical crystallizer |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113308662A (en) * | 2021-05-26 | 2021-08-27 | 泰尔(安徽)工业科技服务有限公司 | Spraying repair method for short-edge copper plate side surface of continuous casting crystallizer |
| CN113308662B (en) * | 2021-05-26 | 2023-04-18 | 泰尔(安徽)工业科技服务有限公司 | Spraying repair method for short-edge copper plate side face of continuous casting crystallizer |
| CN113369653A (en) * | 2021-06-16 | 2021-09-10 | 辽宁石油化工大学 | Method for repairing arc ablation pit of bottom plate of metallurgical crystallizer |
| CN113369653B (en) * | 2021-06-16 | 2022-09-27 | 辽宁石油化工大学 | Method for repairing arc ablation pit of bottom plate of metallurgical crystallizer |
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