CN115110018B - Preparation method of coating for crystallizer copper plate - Google Patents
Preparation method of coating for crystallizer copper plate Download PDFInfo
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- CN115110018B CN115110018B CN202210715153.9A CN202210715153A CN115110018B CN 115110018 B CN115110018 B CN 115110018B CN 202210715153 A CN202210715153 A CN 202210715153A CN 115110018 B CN115110018 B CN 115110018B
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- 239000011248 coating agent Substances 0.000 title claims abstract description 86
- 238000000576 coating method Methods 0.000 title claims abstract description 86
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 title claims abstract description 68
- 239000010949 copper Substances 0.000 title claims abstract description 68
- 229910052802 copper Inorganic materials 0.000 title claims abstract description 68
- 238000002360 preparation method Methods 0.000 title claims abstract description 18
- 239000000843 powder Substances 0.000 claims abstract description 58
- 238000005507 spraying Methods 0.000 claims abstract description 18
- 239000002994 raw material Substances 0.000 claims abstract description 3
- 229910052751 metal Inorganic materials 0.000 claims description 47
- 239000002184 metal Substances 0.000 claims description 47
- 238000005245 sintering Methods 0.000 claims description 44
- 239000002245 particle Substances 0.000 claims description 26
- 238000002156 mixing Methods 0.000 claims description 24
- 238000000034 method Methods 0.000 claims description 20
- PZNSFCLAULLKQX-UHFFFAOYSA-N Boron nitride Chemical compound N#B PZNSFCLAULLKQX-UHFFFAOYSA-N 0.000 claims description 18
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 claims description 18
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 claims description 17
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 17
- 238000010285 flame spraying Methods 0.000 claims description 8
- 238000004519 manufacturing process Methods 0.000 claims description 8
- 239000012300 argon atmosphere Substances 0.000 claims description 6
- 238000000748 compression moulding Methods 0.000 claims description 6
- 238000000227 grinding Methods 0.000 claims description 6
- 238000001513 hot isostatic pressing Methods 0.000 claims description 6
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 claims description 6
- 239000012496 blank sample Substances 0.000 claims 3
- 229910000831 Steel Inorganic materials 0.000 abstract description 8
- 239000010959 steel Substances 0.000 abstract description 8
- 239000000126 substance Substances 0.000 abstract description 5
- 238000009749 continuous casting Methods 0.000 description 10
- 239000010410 layer Substances 0.000 description 9
- 238000005260 corrosion Methods 0.000 description 6
- 230000007797 corrosion Effects 0.000 description 6
- 239000002131 composite material Substances 0.000 description 5
- 239000011159 matrix material Substances 0.000 description 5
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 4
- 238000007731 hot pressing Methods 0.000 description 4
- 238000005299 abrasion Methods 0.000 description 3
- KPUWHANPEXNPJT-UHFFFAOYSA-N disiloxane Chemical class [SiH3]O[SiH3] KPUWHANPEXNPJT-UHFFFAOYSA-N 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 239000002346 layers by function Substances 0.000 description 3
- 238000007747 plating Methods 0.000 description 3
- 229910052582 BN Inorganic materials 0.000 description 2
- 239000000956 alloy Substances 0.000 description 2
- CSDREXVUYHZDNP-UHFFFAOYSA-N alumanylidynesilicon Chemical compound [Al].[Si] CSDREXVUYHZDNP-UHFFFAOYSA-N 0.000 description 2
- 238000005524 ceramic coating Methods 0.000 description 2
- 239000011195 cermet Substances 0.000 description 2
- VNNRSPGTAMTISX-UHFFFAOYSA-N chromium nickel Chemical compound [Cr].[Ni] VNNRSPGTAMTISX-UHFFFAOYSA-N 0.000 description 2
- 238000005253 cladding Methods 0.000 description 2
- 229910052742 iron Inorganic materials 0.000 description 2
- 238000011031 large-scale manufacturing process Methods 0.000 description 2
- 238000004372 laser cladding Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 229910001120 nichrome Inorganic materials 0.000 description 2
- 230000007704 transition Effects 0.000 description 2
- 229910018182 Al—Cu Inorganic materials 0.000 description 1
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- 239000010941 cobalt Substances 0.000 description 1
- 229910017052 cobalt Inorganic materials 0.000 description 1
- GUTLYIVDDKVIGB-UHFFFAOYSA-N cobalt atom Chemical compound [Co] GUTLYIVDDKVIGB-UHFFFAOYSA-N 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000003618 dip coating Methods 0.000 description 1
- 238000009713 electroplating Methods 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000012827 research and development Methods 0.000 description 1
- 229910000679 solder Inorganic materials 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
- 238000004381 surface treatment Methods 0.000 description 1
- 230000002194 synthesizing effect Effects 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 238000007751 thermal spraying Methods 0.000 description 1
- 239000010936 titanium Substances 0.000 description 1
- 229910052719 titanium Inorganic materials 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C4/00—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge
- C23C4/12—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge characterised by the method of spraying
- C23C4/129—Flame spraying
-
- 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
- B22F1/00—Metallic powder; Treatment of metallic powder, e.g. to facilitate working or to improve properties
- B22F1/14—Treatment of metallic powder
-
- 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
- B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
- B22F3/02—Compacting only
-
- 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
- B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
- B22F3/10—Sintering only
- B22F3/1003—Use of special medium during sintering, e.g. sintering aid
- B22F3/1007—Atmosphere
-
- 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
- B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
- B22F3/12—Both compacting and sintering
- B22F3/14—Both compacting and sintering simultaneously
-
- 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
- B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
- B22F3/12—Both compacting and sintering
- B22F3/14—Both compacting and sintering simultaneously
- B22F3/15—Hot isostatic pressing
-
- 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
-
- 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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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Manufacturing & Machinery (AREA)
- Physics & Mathematics (AREA)
- Plasma & Fusion (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Powder Metallurgy (AREA)
Abstract
The invention relates to the technical field of steel, and discloses a preparation method of a coating for a crystallizer copper plate, which comprises the following steps: raw material selection, basic powder preparation, coating powder preparation and copper plate coating. The preparation method of the coating for the crystallizer copper plate has the advantages of high wear resistance, high hardness and good chemical stability at high temperature after spraying, and can effectively prolong the service life of the crystallizer copper plate.
Description
Technical Field
The invention relates to the technical field of steel, in particular to a preparation method of a coating for a crystallizer copper plate.
Background
The crystallizer is the most critical component in continuous casting equipment of a steel mill, and the quality of a copper plate of the crystallizer directly influences the surface quality of a continuous casting billet, the operation rate of a continuous casting machine and the continuous casting cost. The crystallizer copper plate has the problems of edge abrasion, wide-surface hot crack, narrow-surface shrinkage, corrosion and the like in the using process. At present, the focus of research on a crystallizer copper plate is to adopt a proper surface treatment technology to plate one or more materials on the surface of the copper plate so as to obtain a special functional surface, and under the condition that the heat conductivity of the copper plate is not greatly influenced by a plating layer, various plating layers with firm combination with a matrix, good wear resistance and strong hot corrosion resistance are obtained so as to improve the surface property of the copper plate, prolong the service life of the copper plate and improve the quality of a continuous casting billet, thereby achieving the aim of reducing the cost of casting ton steel. The development of high-speed continuous casting brings higher requirements to the surface performance of the crystallizer, and the application of surface modification technologies such as electroplating, chemical plating, thermal spraying, laser cladding and the like to the continuous casting crystallizer can improve the problems of corrosion resistance, abrasion resistance and the like of the surface of the copper plate.
In the published literature, a copper plate with a heat-resistant and wear-resistant gradient coating crystallizer (CN 106903281A) is disclosed, and the surface of a copper plate substrate reported by the invention is provided with a cladding layer prepared by laser cladding, wherein the cladding layer consists of an upper ceramic coating and a lower metal coating. Corrosion-resistant Cr on surface of crystallizer copper plate 3 C 2 Preparation method of NiCr-aluminum silicon composite siloxane composite coating (CN 108070813A), wherein the composite coating disclosed by the invention comprises thermally spraying Cr 3 C 2 The preparation method of the NiCr layer and aluminum silicon composite siloxane coating comprises the steps of sequentially synthesizing hundreds of micrometers of Cr on the surface of a crystallizer copper plate by adopting a supersonic flame spraying and dip-coating method 3 C 2 The NiCr layer and the aluminum-silicon composite siloxane coating are reported to have high density and good corrosion resistance. "method for manufacturing copper plate of metal ceramic coating crystallizer" (CN 101637806B) reports that Cr is sprayed on the surface of copper crystallizer by adopting supersonic flame spraying method 3 C 2 -25NiCr cermet coating, on which a layer of mixed cermet low melting solder is applied, finally remelting in a vacuum furnace. The invention relates to a functional layer alloy material (CN 106591631B) for manufacturing and remanufacturing a crystallizer copper plate by laser, which reports that a Ni-Al-Cu transition alloy layer is clad on the functional layer, and then a cobalt-based functional layer is clad on the transition layer, so that the high-temperature corrosion and abrasion resistance of the surface of the crystallizer is improved.
The crystallizer copper plate in the patent is slightly improved in performance, but is generally not high in service life, so that research and development of the long-life crystallizer copper plate is of great significance for improving continuous casting production efficiency.
Disclosure of Invention
The invention aims to overcome the defects of the technology, and provides a preparation method of a coating for a crystallizer copper plate, which has high wear resistance, high hardness and good chemical stability at high temperature after spraying, and can effectively prolong the service life of the crystallizer copper plate.
In order to achieve the above purpose, the preparation method of the coating for the crystallizer copper plate, which is designed by the invention, comprises the following steps:
a) Raw material selection: selecting metal nickel powder, metal aluminum powder, metal titanium powder and hexagonal boron nitride powder;
b) Preparing basic powder: mixing metal nickel powder and metal aluminum powder according to a mass ratio of 1:1 to prepare first base powder, and mixing metal titanium powder and hexagonal boron nitride powder according to a mass ratio of 3:2 to prepare second base powder;
c) Preparing coating powder: mixing the first base powder and the second base powder prepared in the step B) according to the mass ratio of 10 (1-5) by adopting a mixer, preparing a green body sample by adopting a compression molding method after uniformly mixing, sintering the green body sample by adopting a sintering mode under the protection of argon atmosphere, and grinding the green body sample by adopting a crusher after sintering is finished to prepare coating powder;
d) And (2) coating a copper plate: and C) pretreating the surface of the copper plate to enable the surface to rust and roughness to meet the spraying requirement, and spraying the coating powder prepared in the step C) on the surface of the copper plate to form a coating by adopting a supersonic flame spraying method.
Preferably, in the step a), the particle size of the metal nickel powder is 3 to 10 μm, the particle size of the metal aluminum powder is 15 to 30 μm, the particle size of the metal titanium powder is 10 to 40 μm, and the particle size of the hexagonal boron nitride powder is 5 to 10 μm.
Preferably, in the step a), the purity of the metallic nickel powder, the metallic aluminum powder, the metallic titanium powder and the hexagonal boron nitride powder is all greater than 99%.
Preferably, in the step C), the sintering temperature is 1800-2300 ℃.
Preferably, in the step C), the sintering mode is one of normal pressure sintering, hot press sintering or hot isostatic pressing sintering.
Preferably, in the step C), the particle size of the coating powder is less than 5 μm
Preferably, in the step D), the thickness of the coating is 0.3-1.5 mm
In the invention, nickel and aluminum are adopted as coating base materials, the combination property of the coating and a copper plate in the spraying process can be fully ensured, and titanium and hexagonal boron nitride are adopted as coating combination phases, so that on one hand, tiB generated in the high-temperature process can be ensured 2 And TiN can give the coating sufficient hardness, on the other hand, part of the residual hexagonal boron nitride can give the self-lubricating property to the surface of the coating due to the layered structure, so that the wear resistance of the coating is improved.
Compared with the prior art, the invention has the following advantages:
1. the wear resistance after spraying is high, the hardness is high, the chemical stability at high temperature is good, and the service life of the crystallizer copper plate can be prolonged;
2. the method can be applied to continuous casting crystallizer copper plates, can be applied to the fields of high temperature resistant industries such as ladles, tundish and iron ladles, overcomes the problems of short service life and wear resistance of the existing crystallizer copper plates, and is hopeful to be popularized and applied in large-scale production.
Drawings
FIG. 1 is a graph showing the fracture morphology of the coating in example 1 of the preparation method of the coating for a crystallizer copper plate of the present invention.
Detailed Description
The invention will now be described in further detail with reference to the drawings and to specific examples.
Example 1
A preparation method of a coating for a crystallizer copper plate comprises the following steps:
a) Selecting metal nickel powder with the grain diameter of 3 mu m and the purity of 99%, metal aluminum powder with the grain diameter of 15 mu m and the purity of 99%, metal titanium powder with the grain diameter of 10 mu m and the purity of 99%, hexagonal boron nitride powder with the grain diameter of 5 mu m and the purity of 99%;
b) Preparing basic powder: mixing metal nickel powder and metal aluminum powder according to a mass ratio of 1:1 to prepare first base powder, and mixing metal titanium powder and hexagonal boron nitride powder according to a mass ratio of 3:2 to prepare second base powder;
c) Preparing coating powder: mixing the first base powder and the second base powder prepared in the step B) by a mixer according to the mass ratio of 10:1, preparing a green body sample by adopting a compression molding method after uniformly mixing, sintering the green body sample by adopting a sintering mode of normal pressure sintering, hot pressing sintering or hot isostatic pressing sintering under the protection of argon atmosphere, wherein the sintering temperature is 1800 ℃, and grinding the green body sample by adopting a crusher after the sintering is completed to prepare coating powder, wherein the particle size of the coating powder is 5 mu m;
d) And (2) coating a copper plate: and C) carrying out pretreatment on the surface of the copper plate to enable the surface to rust and roughness to meet the spraying requirement, and then spraying the coating powder prepared in the step C) on the surface of the copper plate by adopting a supersonic flame spraying method to form a coating, wherein the thickness of the coating is 0.3mm.
In the embodiment, the fracture morphology graph of the coating is shown in fig. 1, the compactness of the surface coating of the crystallizer copper plate is more than 98.5%, the hardness value reaches HV1850, the bonding strength of the coating and a matrix is 195MPa, and the single-pass steel amount is 7 ten thousand tons/sleeve in practical use.
Example 2
A preparation method of a coating for a crystallizer copper plate comprises the following steps:
a) Selecting metal nickel powder with the particle size of 10 mu m and the purity of 99%, metal aluminum powder with the particle size of 30 mu m and the purity of 99%, metal titanium powder with the particle size of 40 mu m and the purity of 99%, hexagonal boron nitride powder with the particle size of 5 mu m and the purity of 99%;
b) Preparing basic powder: mixing metal nickel powder and metal aluminum powder according to a mass ratio of 1:1 to prepare first base powder, and mixing metal titanium powder and hexagonal boron nitride powder according to a mass ratio of 3:2 to prepare second base powder;
c) Preparing coating powder: mixing the first base powder and the second base powder prepared in the step B) by a mixer according to the mass ratio of 10:3, preparing a green body sample by adopting a compression molding method after uniformly mixing, sintering the green body sample by adopting a sintering mode of normal pressure sintering, hot pressing sintering or hot isostatic pressing sintering under the protection of argon atmosphere, wherein the sintering temperature is 2100 ℃, and grinding the green body sample by adopting a crusher after the sintering is finished to prepare coating powder, wherein the particle size of the coating powder is 4 mu m;
d) And (2) coating a copper plate: and C) carrying out pretreatment on the surface of the copper plate to enable the surface to rust and roughness to meet the spraying requirement, and then spraying the coating powder prepared in the step C) on the surface of the copper plate by adopting a supersonic flame spraying method to form a coating, wherein the thickness of the coating is 1mm.
According to tests, in the embodiment, the compactness of the surface coating of the crystallizer copper plate is more than 97.8%, the hardness value reaches HV1653, the bonding strength of the coating and a matrix is 175MPa, and the single-pass steel passing amount is 5.8 ten thousand tons/sleeve in practical use.
Example 3
A preparation method of a coating for a crystallizer copper plate comprises the following steps:
a) Selecting metal nickel powder with the particle size of 3 mu m and the purity of 99%, metal aluminum powder with the particle size of 20 mu m and the purity of 99%, metal titanium powder with the particle size of 15 mu m and the purity of 99%, hexagonal boron nitride powder with the particle size of 10 mu m and the purity of 99%;
b) Preparing basic powder: mixing metal nickel powder and metal aluminum powder according to a mass ratio of 1:1 to prepare first base powder, and mixing metal titanium powder and hexagonal boron nitride powder according to a mass ratio of 3:2 to prepare second base powder;
c) Preparing coating powder: mixing the first base powder and the second base powder prepared in the step B) by a mixer according to the mass ratio of 10:4, preparing a green body sample by adopting a compression molding method after uniformly mixing, sintering the green body sample by adopting a sintering mode of normal pressure sintering, hot pressing sintering or hot isostatic pressing sintering under the protection of argon atmosphere, wherein the sintering temperature is 2300 ℃, and grinding the green body sample by adopting a crusher after the sintering is completed to prepare coating powder, wherein the particle size of the coating powder is 3 mu m;
d) And (2) coating a copper plate: and C) carrying out pretreatment on the surface of the copper plate to enable the surface to rust and roughness to meet the spraying requirement, and then spraying the coating powder prepared in the step C) on the surface of the copper plate by adopting a supersonic flame spraying method to form a coating, wherein the thickness of the coating is 1.5mm.
In the embodiment, the compactness of the surface coating of the crystallizer copper plate is 97.2%, the hardness value reaches HV1712, the bonding strength of the coating and the matrix is 165MPa, and the single-pass steel passing amount is 6.3 ten thousand tons/sleeve in practical use.
Example 4
A preparation method of a coating for a crystallizer copper plate comprises the following steps:
a) Selecting metal nickel powder with the particle size of 8 mu m and the purity of 99%, metal aluminum powder with the particle size of 25 mu m and the purity of 99%, metal titanium powder with the particle size of 15 mu m and the purity of 99%, hexagonal boron nitride powder with the particle size of 8 mu m and the purity of 99%;
b) Preparing basic powder: mixing metal nickel powder and metal aluminum powder according to a mass ratio of 1:1 to prepare first base powder, and mixing metal titanium powder and hexagonal boron nitride powder according to a mass ratio of 3:2 to prepare second base powder;
c) Preparing coating powder: mixing the first base powder and the second base powder prepared in the step B) by a mixer according to the mass ratio of 10:5, preparing a green body sample by adopting a compression molding method after uniformly mixing, sintering the green body sample by adopting a sintering mode of normal pressure sintering, hot pressing sintering or hot isostatic pressing sintering under the protection of argon atmosphere, wherein the sintering temperature is 2280 ℃, and grinding the green body sample by adopting a crusher after the sintering is completed to prepare coating powder, wherein the particle size of the coating powder is 2 mu m;
d) And (2) coating a copper plate: and C) carrying out pretreatment on the surface of the copper plate to enable the surface to rust and roughness to meet the spraying requirement, and then spraying the coating powder prepared in the step C) on the surface of the copper plate by adopting a supersonic flame spraying method to form a coating, wherein the thickness of the coating is 1.4mm.
In the embodiment, the compactness of the surface coating of the crystallizer copper plate is 98.6%, the hardness value reaches HV1925, the bonding strength of the coating and the matrix is 225MPa, and the single-pass steel consumption is 7.1 ten thousand tons/sleeve in practical use.
The preparation method of the coating for the crystallizer copper plate has the advantages of high wear resistance, high hardness and good chemical stability at high temperature after spraying, and can prolong the service life of the crystallizer copper plate; the method can be applied to continuous casting crystallizer copper plates, can be applied to the fields of high temperature resistant industries such as ladles, tundish and iron ladles, overcomes the problems of short service life and wear resistance of the existing crystallizer copper plates, and is hopeful to be popularized and applied in large-scale production.
Claims (6)
1. A preparation method of a coating for a crystallizer copper plate is characterized by comprising the following steps of: the method comprises the following steps:
a) Raw material selection: selecting metal nickel powder, metal aluminum powder, metal titanium powder and hexagonal boron nitride powder;
b) Preparing basic powder: mixing metal nickel powder and metal aluminum powder according to a mass ratio of 1:1 to prepare first base powder, and mixing metal titanium powder and hexagonal boron nitride powder according to a mass ratio of 3:2 to prepare second base powder;
c) Preparing coating powder: mixing the first base powder and the second base powder prepared in the step B) according to the mass ratio of 10 (1-5) by adopting a mixer, preparing a blank sample by adopting a compression molding method after uniformly mixing, sintering the blank sample by adopting a sintering mode under the protection of argon atmosphere, wherein the sintering temperature is 1800-2300 ℃, and grinding the blank sample by adopting a crusher after sintering is completed to prepare coating powder;
d) And (2) coating a copper plate: and C) pretreating the surface of the copper plate to enable the surface to rust and roughness to meet the spraying requirement, and spraying the coating powder prepared in the step C) on the surface of the copper plate to form a coating by adopting a supersonic flame spraying method.
2. The method for producing a coating for a copper plate of a mold according to claim 1, wherein: in the step A), the particle size of the metal nickel powder is 3-10 mu m, the particle size of the metal aluminum powder is 15-30 mu m, the particle size of the metal titanium powder is 10-40 mu m, and the particle size of the hexagonal boron nitride powder is 5-10 mu m.
3. The method for producing a coating for a copper plate of a mold according to claim 1, wherein: in the step A), the purity of the metal nickel powder, the metal aluminum powder, the metal titanium powder and the hexagonal boron nitride powder is more than 99 percent.
4. The method for producing a coating for a copper plate of a mold according to claim 1, wherein: in the step C), the sintering mode is one of normal pressure sintering, hot press sintering or hot isostatic pressing sintering.
5. The method for producing a coating for a copper plate of a mold according to claim 1, wherein: in the step C), the particle size of the coating powder is less than 5 μm.
6. The method for producing a coating for a copper plate of a mold according to claim 1, wherein: in the step D), the thickness of the coating is 0.3-1.5 mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210715153.9A CN115110018B (en) | 2022-06-22 | 2022-06-22 | Preparation method of coating for crystallizer copper plate |
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