CN113913728A - Method for improving bonding strength of plasma spraying AT coating on surface of overfeed roller disc - Google Patents

Method for improving bonding strength of plasma spraying AT coating on surface of overfeed roller disc Download PDF

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Publication number
CN113913728A
CN113913728A CN202111146402.9A CN202111146402A CN113913728A CN 113913728 A CN113913728 A CN 113913728A CN 202111146402 A CN202111146402 A CN 202111146402A CN 113913728 A CN113913728 A CN 113913728A
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China
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coating
spraying
roller disc
plasma
overfeed roller
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CN202111146402.9A
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陈�峰
张申
沈健健
张方权
吴立军
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Deqing Chuangzhi Technology Co ltd
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Deqing Chuangzhi Technology Co ltd
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Priority to CN202111146402.9A priority Critical patent/CN113913728A/en
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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
    • C23C4/134—Plasma spraying
    • 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
    • C23C4/08—Metallic material containing only metal elements
    • 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
    • C23C4/10—Oxides, borides, carbides, nitrides or silicides; Mixtures thereof
    • C23C4/11—Oxides
    • 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

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Plasma & Fusion (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Coating By Spraying Or Casting (AREA)

Abstract

The invention relates to an improvement method of textile parts, in particular to a method for improving the bonding strength of an AT coating sprayed on the surface of an overfeed roller disc by plasma. The method specifically comprises the following steps: overfeeding a roller disc substrate; carrying out sand blasting treatment; first plasma spraying: spraying a nickel-chromium coating, wherein the content ratio of the nickel-chromium coating is Ni 70-90 wt%: 10 to 30 weight percent of Cr and 0.02 to 0.05mm of coating thickness; and (3) secondary plasma spraying: spraying an aluminum oxide titanium coating, wherein the thickness of the coating is 0.15-0.20 mm; hole sealing treatment; and (5) post-treatment. The method for improving the bonding strength of the plasma sprayed AT coating on the surface of the overfeed roller disc greatly improves the bonding strength of the coating and a matrix and reduces the surface roughness of the coating.

Description

Method for improving bonding strength of plasma spraying AT coating on surface of overfeed roller disc
Technical Field
The invention relates to an improvement method of textile parts, in particular to a method for improving the bonding strength of an AT coating sprayed on the surface of an overfeed roller disc by plasma.
Background
Textile parts require a well-defined surface shape, since these parts must function to guide, wind, spin, string and wind the fibers in contact with the fibers. The special surface has tension for design requirements, simultaneously requires no napping and scratching to fibers, and also has enough wear resistance to meet the long-term stable working requirement of textile parts, particularly the large-scale production in the textile industry. The ceramic coating can meet the requirements of most textile machinery by the unique characteristics of the ceramic coating.
The ceramic coating is a generic term for a heat-resistant inorganic protective layer or surface film coated on a metal surface, which can change the appearance, structure and chemical composition of the outer surface of a metal base material and impart new properties to the base material. The variety of coatings is wide; the coating can be divided into silicate coatings, oxide coatings, non-oxide coatings, composite ceramic coatings and the like according to the composition, and can be divided into a sintering coating, a spraying coating, a vapor deposition and diffusion coating, a low-temperature baking coating, an electrochemical process coating, a sol-gel coating, an in-situ reaction coating and the like according to the process method; according to the performance and the application, the coating can be divided into a temperature control coating (comprising a temperature control coating, a heat insulation coating, an infrared radiation coating and the like), a heat-resistant coating (comprising a high-temperature oxidation resistant coating, a corrosion resistant coating, a heat treatment protective coating and the like), a friction coating (comprising an anti-wear lubricating coating, a wear resistant coating, an electrical performance coating (comprising an electric conduction coating, an insulating coating and the like), a special performance coating (comprising an electromagnetic wave absorption coating, an atomic radiation resistant coating and the like) and a process performance coating and the like.
The ceramic coating has the characteristics that: good chemical stability, abrasion resistance, corrosion resistance, high temperature resistance, oxidation resistance, high hardness, adhesion resistance and good biocompatibility. At present, the ceramic coating becomes an indispensable key material in a plurality of high and new technical fields due to the excellent performance of the coating, and the ceramic coating is successfully applied to the industries of aerospace, aviation, national defense, chemical engineering, machinery, electric power, electronics and the like, has wider and wider application range and has wide development prospect.
The ceramic coating is applied to the key parts of textile parts, so that the manufacturing speed and quality of synthetic fiber and yarn are greatly broken through; it can maintain the structural strength of the base material, and is the latest technical scheme for solving the problems of poor heat resistance, poor wear resistance and easy corrosion. At present, the ceramic materials which can be widely applied are mainly oxide ceramics and carbide ceramics, wherein the oxide ceramics have a series of excellent performances of high melting point, oxidation resistance, low heat conductivity coefficient, wear resistance, corrosion resistance, electric insulation and the like.
The overfeeding roller disc of the twisting disc for the textile machinery often has the problems of grinding and whitening the tip part, layering, falling off of a coating, unqualified roughness and the like in the subsequent processing process. The reason is that the bonding strength of the coating and the substrate is low in the process of spraying the overfeed roller disc, generally about 20MPa, and the processing amount is increased due to overhigh spraying surface roughness, and the general surface roughness is about Ra 6.
Disclosure of Invention
The invention aims to solve the technical problems and provides a method for improving the bonding strength of an AT coating sprayed on the surface of an overfeed roller disc by plasma.
The technical purpose of the invention is realized by the following technical scheme:
a method for improving the bonding strength of an AT coating sprayed on the surface of an overfeed roller disc by plasma comprises the following steps:
(1) overfeeding a roller disc substrate;
(2) carrying out sand blasting treatment;
(3) first plasma spraying: spraying a nickel-chromium coating, wherein the content ratio of the nickel-chromium coating is Ni 70-90 wt%: 10 to 30 weight percent of Cr and 0.02 to 0.05mm of coating thickness;
(4) and (3) secondary plasma spraying: spraying an aluminum oxide titanium coating, wherein the thickness of the coating is 0.15-0.20 mm;
(5) hole sealing treatment;
(6) and (5) post-treatment.
The oxide ceramic material commonly used for the overfeeding roller disc of the textile part short fiber two-for-one twister is mainly composite material Al2O3+TiO2(AT powder), the ceramicThe coating is applied to the spinning machine parts due to the characteristics of low price, good spraying manufacturability, compact coating, high hardness, low friction coefficient and the like.
After plasma spraying, ceramic AT powder is treated through different post-treatment techniques, such as polishing, brushing, grinding, polishing, etc. to obtain different surface state ceramic coating layers with different hardness to meet the requirement of various fiber spinning performance.
The ceramic material AT powder is widely used in textile machine parts because of its distinctive characteristics:
1. the AT powder has excellent high-speed fiber abrasion resistance, and the AT coating has high hardness and low surface energy property, so that the AT coating has the necessary wear resistance and friction reduction, and the AT coating is not easily replaced by other materials;
2. different AT coating post-processing methods provide surfaces with different profiles and thus different frictional forces, which can impart moderate "twist" to the fibers to achieve the necessary strength and tenacity;
3. the proper surface roughness is provided by utilizing the spraying state of countless particle bulges on the surface of the AT coating (sharp peak tops can be eliminated by proper processing), the necessary degree of fluff is obtained on the surface of the fiber when the AT coating acts on the fiber, the dyeing is good, and the AT coating has certain hygroscopicity and the like.
The AT coating is an alumina titanium coating, pits on the surface of the overfeed roller disc after sand blasting are uniformly distributed, no pit is formed, the pits on a unit area are more uniform and more, and the bonding strength and proper roughness of a subsequent coating and a matrix can be better ensured; the AT ceramic coating obtained after the two plasma spraying processes is high in bonding strength with the substrate through the nickel-chromium bottom layer and reaches more than 30 MPa. The roughness of the coating is low and is generally below Ra5, so that the subsequent processing of the overfeed roller disc is facilitated, and the problems of white grinding, layering, falling, roughness and the like in the subsequent processing process are avoided. The method for improving the bonding strength of the plasma sprayed AT coating on the surface of the overfeed roller disc greatly improves the bonding strength of the coating and a substrate, reduces the surface roughness of the coating and ensures that the surface roughness value is below Ra 5.
Preferably, the step (1) of treating the overfeed roller disc substrate comprises ultrasonic oil removal and drying of the overfeed roller disc substrate.
Preferably, the sand blasting treatment in the step (2) comprises the step of adopting a roller type automatic sand blasting machine, wherein the sand is white corundum and has a mesh size of 20-50, the sand blasting pressure is 0.4-0.5Mpa, the sand blasting time is 30-60 minutes, the sand blasting angle is 50-70 degrees, the sand blasting distance is 80-200mm, and the workpiece rotating speed is 8-30 revolutions per minute.
After sand blasting, the concave points on the surface of the overfeed roller disc are uniformly distributed without deep pits, the concave points on the unit area are more uniform, and the roughness after sand blasting is Ra 3-4. The overfeed roller disc after sandblasting can better guarantee the bonding strength of the bottom nickel-chromium coating and the substrate, and the AT coating surface has proper roughness (about Ra 5), so that the foundation is laid for post-processing.
More preferably, the sand blasting treatment in the step (2) comprises the step of adopting a roller type automatic sand blasting machine, wherein the sand is white corundum with 30-46 meshes, the sand blasting pressure is 0.4-0.5MPa, the sand blasting time is 30-60 minutes, the sand blasting angle is 60 degrees, the sand blasting distance is 100mm and the workpiece rotating speed is 10-20 r/min.
Preferably, the first plasma spraying in the step (3) comprises preheating the overfeed roller disc substrate to 140 ℃ at first, spraying the nickel-chromium coating by using a spray gun of plasma spraying equipment, selecting 10-38 mu m nickel-chromium powder, spraying the current of 350-; the thickness of the coating is 0.02-0.05 mm.
The invention selects a thinner nickel-chromium bottom layer, and selects nickel-chromium powder with the thickness of 10-38 mu m, so that the uniformity of the bottom layer and the bonding strength with a matrix can be better ensured, and the roughness is smaller (generally Ra 3-4).
More preferably, the first plasma spraying in step (3) comprises preheating the overfeed roller disc substrate to 120 ℃, spraying 80% Ni20% Cr of the nickel-chromium coating by using a spray gun SG100 plasma spraying equipment of the United states of Thermich company, selecting 10-38 μm nickel-chromium powder, spraying current 350-; the thickness of the coating is 0.02-0.05 mm.
Preferably, the second plasma spraying in the step (4) comprises spraying alumina titanium by using a spray gun, wherein the spraying current is 550-700A, the voltage is 40-50V, the spraying distance is 80-120mm, and the thickness of the coating is 0.15-0.20 mm; in the spraying process, firstly, a 0.02-0.05mm alumina titanium surface layer is sprayed on the overfeed roller disc with the bottom layer sprayed, and the temperature is controlled at 130-; then the temperature of the workpiece is raised to 200-220 ℃ by a heating mode, and then the subsequent spraying is carried out.
The thinner surface layer is sprayed firstly, so that the bottom layer can be prevented from being oxidized in the following spraying process; and then, the temperature of the workpiece is raised by a heating mode, and subsequent spraying is carried out, wherein the higher temperature of the matrix can effectively ensure that the subsequent sprayed powder AT powder is molten in the spraying process, but the specific temperature of the sprayed overfeed roller disc is ensured in the spraying process, and particularly the temperature of the sprayed overfeed roller disc is required to be less than 250 ℃.
More preferably, the second plasma spraying in the step (4) comprises spraying the titanium aluminum oxide by using a plasma device SG100 spray gun of thermal corporation of America, wherein the spraying current is 600A, the voltage is 45V, the spraying distance is 100mm, and the thickness of the coating is 0.15-0.20 mm; in the spraying process, firstly, a 0.02-0.05mm alumina titanium surface layer is sprayed on the overfeed roller disc on which the bottom layer is sprayed, and the temperature is controlled to be about 150 ℃; and then, the temperature of the workpiece is raised to 200-220 ℃ by a heating mode, and subsequent spraying is carried out, wherein the high temperature of the matrix can effectively ensure that AT powder is molten in the spraying process, but the temperature of the overfeed roller disc after spraying is ensured to be less than 250 ℃ in the spraying process.
Preferably, the hole sealing treatment of the step (5) comprises hole sealing treatment of the coating by using paraffin, and the ceramic coating on the surface of the overfeed roller disc is required to be completely soaked and cannot have exposed and un-coated places.
Preferably, a coating treatment is further included between the second plasma spraying in the step (4) and the hole sealing treatment in the step (5), and the method specifically includes the following steps:
A. preparation of primary coating agent: mixing alumina and/or titanium dioxide with the particle size of 1 nm-5 mu m and dimethylformamide according to the mass ratio of 1: (300-500) mixing to prepare a first mixed solution, then adding 3-5 times of polyvinylidene fluoride-hexafluoropropylene of the weight of alumina and/or titanium dioxide, then adding 5-7 times of polymethyl methacrylate of the weight of alumina and/or titanium dioxide, and uniformly stirring at 60-75 ℃ to obtain a primary coating agent;
B. primary coating treatment: coating the primary coating agent on the surface of the secondary plasma sprayed overfeed roller disc, and drying at the temperature of 120-;
C. preparing a secondary coating agent: mixing alumina and/or titanium dioxide with the particle size of 1 nm-5 mu m and isopropanol according to the weight ratio of 1: (130-230), heating to 150-170 ℃, adding distearoyl-oxy-isopropyl aluminate with the weight 2-3 times that of the alumina and/or titanium dioxide, uniformly mixing, centrifugally filtering, and drying to obtain a secondary coating intermediate; and then mixing the secondary coating intermediate with dimethylformamide according to the mass ratio of 1: (300-500) mixing to prepare a second mixed solution, then adding 3-5 times of polyvinylidene fluoride-hexafluoropropylene of the weight of alumina and/or titanium dioxide, then adding 5-7 times of polymethyl methacrylate of the weight of alumina and/or titanium dioxide, and uniformly stirring at 60-75 ℃ to obtain a secondary coating agent;
D. secondary coating treatment: and (C) coating the secondary coating agent on the surface of the overfeed roller disc subjected to primary coating in the step B, and drying at 80-100 ℃.
According to the specific secondary coating process, the hydrophilic group in the aluminate coupling agent molecule reacts with the surface of the coating agent or forms an entangled structure, and the oil group reacts with the binder and the base film or forms an entangled structure, so that the interface compatibility of the coating agent and the overfeed roller disc is improved, and the surface roughness of the overfeed roller disc and the bonding strength of an AT coating are further reduced.
Preferably, the step (6) post-treatment comprises polishing by hand or mechanical grinding.
In conclusion, the invention has the following beneficial effects:
1. the AT coating is an alumina titanium coating, pits on the surface of the overfeed roller disc after sand blasting are uniformly distributed, no pit is formed, the pits on a unit area are more uniform and more, and the bonding strength and proper roughness of a subsequent coating and a matrix can be better ensured; the AT ceramic coating obtained after the two plasma spraying processes is high in bonding strength with the substrate through the nickel-chromium bottom layer, and the bonding strength is more than 30 Mpa; the roughness of the coating is low and is generally below Ra5, so that the subsequent processing of the overfeed roller disc is facilitated, and the problems of white grinding, layering, falling, roughness and the like in the subsequent processing process are avoided. The method for improving the bonding strength of the plasma sprayed AT coating on the surface of the overfeed roller disc greatly improves the bonding strength of the coating and a substrate, reduces the surface roughness of the coating and ensures that the surface roughness value is below Ra 5;
2. the thinner surface layer is sprayed firstly, so that the bottom layer can be prevented from being oxidized in the following spraying process; then, the temperature of the workpiece is raised in a heating mode, and then subsequent spraying is carried out, the higher temperature of the matrix can effectively ensure that the subsequent sprayed powder AT powder is molten in the spraying process, but the specific temperature of the sprayed overfeed roller disc is ensured in the spraying process, and particularly the temperature of the sprayed overfeed roller disc is required to be less than 250 ℃;
3. according to the specific secondary coating process, the hydrophilic group in the aluminate coupling agent molecule reacts with the surface of the coating agent or forms an entangled structure, and the oil group reacts with the binder and the base film or forms an entangled structure, so that the interface compatibility of the coating agent and the overfeed roller disc is improved, and the surface roughness of the overfeed roller disc and the bonding strength of an AT coating are further reduced.
Detailed Description
Example 1
1. Ultrasonic oil removal and drying of the overfeed roller disc substrate;
2. a drum-type automatic sand blasting machine is adopted, white corundum is selected as sand, the grain size is 30-46 meshes, the sand blasting pressure is 0.45Mpa, the sand blasting time is 40 minutes, the sand blasting angle is 60 degrees, the sand blasting distance is 120mm, and the workpiece rotating speed is 15 revolutions per minute. After sand blasting, the concave points on the surface of the overfeed roller disc are uniformly distributed without deep pits, the concave points on the unit area are more uniform, and the roughness after sand blasting is Ra 3-4. The overfeeding roller disc after sand blasting can better ensure the bonding strength of the bottom layer (80 percent of Ni20 percent of Cr) and the matrix, and the surface of the AT coating has proper roughness, thus laying a foundation for post processing;
3. the overfeed roller disc substrate is preheated to 120 ℃, a nickel-chromium coating (80% Ni20% Cr) is sprayed by using a plasma spraying device SG100 spray gun of the United states Thermich company, a thinner nickel-chromium bottom layer is selected, 15-20 mu m nickel-chromium powder is selected, the spraying current is 380A, the voltage is 35V, and the distance of the spray gun is 110 mm. The thickness of the coating is 0.03 mm;
4. spraying alumina titanium (taking AT13 as an example) by using an SG100 spray gun of plasma equipment of Therman company in America, wherein the spraying current is 600A, the voltage is 45V, the spraying distance is 100mm, and the coating thickness is 0.18mm. in the spraying process, firstly, a 0.04mm AT13 surface layer is sprayed on an overfeed roller disc on which a bottom layer is sprayed, the temperature is controlled to be about 150 ℃, and a thinner surface layer is sprayed firstly to prevent the bottom layer from being oxidized in the spraying process below; and then, the temperature of the workpiece is raised to 210 ℃ by a heating mode, and then subsequent spraying is carried out, wherein the high temperature of the matrix can effectively ensure that AT powder is molten in the spraying process, but the temperature of the overfeed roller disc after spraying is ensured to be less than 250 ℃ in the spraying process. The ultra-feeding roller disc processed in the way has high bonding strength of the AT ceramic coating and the matrix through the nickel-chromium bottom layer, and the bonding strength reaches 30 Mpa. The roughness of the coating is low and is generally below Ra5, so that the subsequent processing of the overfeed roller disc is facilitated, and the problems of white grinding, layering, falling, roughness and the like in the subsequent processing process are avoided;
5. sealing holes of the coating by using paraffin, wherein the ceramic coating on the surface of the overfeed roller disc is required to be completely soaked, and no exposed part can be coated;
6. and (4) grinding and polishing manually or mechanically.
Example 2
A method for improving the bonding strength of an AT coating sprayed on the surface of an overfeed roller disc by plasma comprises the following steps:
(1) overfeeding the roller disc substrate: ultrasonic oil removal and drying;
(2) sand blasting treatment: adopting a drum-type automatic sand blasting machine, wherein the sand is white corundum with 20-30 meshes, the sand blasting pressure is 0.4Mpa, the sand blasting time is 30 minutes, the sand blasting angle is 50 degrees, the sand blasting distance is 80mm, and the workpiece rotating speed is 8 r/min;
(3) first plasma spraying: spraying a nickel-chromium coating, which comprises preheating an overfeed roller disc matrix to 100 ℃, spraying the nickel-chromium coating by using a spray gun of plasma spraying equipment, selecting 10-15 mu m nickel-chromium powder, spraying current of 350A, voltage of 30V, distance of 80mm of the spray gun, and mixing the content of the nickel-chromium coating with Ni of 70 wt%: 30wt% of Cr and 0.02mm of coating thickness;
(4) and (3) secondary plasma spraying: comprises spraying alumina titanium by a spray gun, wherein the spraying current is 650A, the voltage is 40V, the spraying distance is 80mm, and the thickness of the coating is 0.15 mm; in the spraying process, firstly, spraying a 0.02mm alumina titanium surface layer on an overfeed roller disc with a sprayed bottom layer, and controlling the temperature at 130 ℃; then, the temperature of the workpiece is raised to 200 ℃ in a heating mode, and then subsequent spraying is carried out, wherein the temperature of the sprayed overfeed roller disc is ensured to be less than 250 ℃ in the spraying process; spraying an aluminum oxide titanium coating, wherein the thickness of the coating is 0.15 mm;
(5) hole sealing treatment: the method comprises the steps of carrying out hole sealing treatment on a coating by using paraffin, wherein the ceramic coating on the surface of the overfeed roller disc is required to be completely soaked, and no exposed part can be coated;
(6) and (3) post-treatment: including manual or mechanical grinding and polishing.
Example 3
A method for improving the bonding strength of an AT coating sprayed on the surface of an overfeed roller disc by plasma comprises the following steps:
(1) overfeeding the roller disc substrate: ultrasonic oil removal and drying;
(2) sand blasting treatment: adopting a drum-type automatic sand blasting machine, wherein the sand is white corundum with 40-50 meshes, the sand blasting pressure is 0.5Mpa, the sand blasting time is 60 minutes, the sand blasting angle is 70 degrees, the sand blasting distance is 200mm, and the workpiece rotating speed is 30 revolutions per minute;
(3) first plasma spraying: spraying a nickel-chromium coating, which comprises preheating an overfeed roller disc matrix to 140 ℃, spraying the nickel-chromium coating by using a spray gun of plasma spraying equipment, selecting 20-38 mu m nickel-chromium powder, spraying current of 400A, voltage of 38V, distance of 120mm of the spray gun, and mixing the content of the nickel-chromium coating with Ni of 90 wt%: 10wt% of Cr and 0.05mm of coating thickness;
(4) and (3) secondary plasma spraying: comprises spraying alumina titanium by a spray gun, wherein the spraying current is 700A, the voltage is 50V, the spraying distance is 120mm, and the thickness of the coating is 0.20 mm; in the spraying process, firstly, spraying a 0.05mm alumina titanium surface layer on an overfeed roller disc with a sprayed bottom layer, and controlling the temperature at 170 ℃; then, the temperature of the workpiece is raised to 220 ℃ in a heating mode, and then subsequent spraying is carried out, wherein the temperature of the sprayed overfeed roller disc is ensured to be less than 250 ℃ in the spraying process; spraying an aluminum oxide titanium coating, wherein the thickness of the coating is 0.20 mm;
(5) hole sealing treatment: the method comprises the steps of carrying out hole sealing treatment on a coating by using paraffin, wherein the ceramic coating on the surface of the overfeed roller disc is required to be completely soaked, and no exposed part can be coated;
(6) and (3) post-treatment: including manual or mechanical grinding and polishing.
Example 4
The method is the same as the embodiment 1, except that a coating treatment is further included between the second plasma spraying in the step (4) and the hole sealing treatment in the step (5), and the method specifically comprises the following steps:
A. preparation of primary coating agent: mixing alumina and titanium dioxide with the particle size of 1 nm-5 mu m and dimethylformamide according to the mass ratio of 1: 400 to obtain a first mixed solution, wherein the mass ratio of the alumina to the titanium dioxide is 1: 1; then adding polyvinylidene fluoride-hexafluoropropylene accounting for 4 times of the weight of the alumina and/or the titanium dioxide, adding polymethyl methacrylate accounting for 6 times of the weight of the alumina and/or the titanium dioxide, and uniformly stirring at 65 ℃ to obtain a primary coating agent;
B. primary coating treatment: coating the primary coating agent on the surface of the secondary plasma sprayed overfeed roller disc, and drying at 125 ℃;
C. preparing a secondary coating agent: mixing alumina and/or titanium dioxide with the particle size of 1 nm-5 mu m and isopropanol according to the weight ratio of 1: 200, heating to 160 ℃, adding distearoyl-oxy-isopropyl aluminate with the weight 2.5 times that of the alumina and/or titanium dioxide, mixing uniformly, centrifuging, filtering and drying to obtain a secondary coating intermediate; and then mixing the secondary coating intermediate with dimethylformamide according to the mass ratio of 1: 400 to obtain a second mixed solution, then adding polyvinylidene fluoride-hexafluoropropylene with the weight of 4 times of the weight of the alumina and/or the titanium dioxide, adding polymethyl methacrylate with the weight of 6 times of the weight of the alumina and/or the titanium dioxide, and uniformly stirring at 70 ℃ to obtain a secondary coating agent;
D. secondary coating treatment: and (C) coating the secondary coating agent on the surface of the overfeed roller disc subjected to primary coating in the step B, and drying at 90 ℃.
Example 5
The method is the same as the embodiment 2, except that a coating treatment is further included between the second plasma spraying in the step (4) and the hole sealing treatment in the step (5), and the method specifically comprises the following steps:
A. preparation of primary coating agent: mixing alumina and titanium dioxide with the particle size of 1 nm-5 mu m and dimethylformamide according to the mass ratio of 1: 300 to obtain a first mixed solution, wherein the mass ratio of the alumina to the titanium dioxide is 1: 1; then adding 3 times of polyvinylidene fluoride-hexafluoropropylene of the weight of the alumina and/or the titanium dioxide, adding 5 times of polymethyl methacrylate of the weight of the alumina and/or the titanium dioxide, and uniformly stirring at 60 ℃ to obtain a primary coating agent;
B. primary coating treatment: coating the primary coating agent on the surface of the secondary plasma sprayed overfeed roller disc, and drying at 120 ℃;
C. preparing a secondary coating agent: mixing alumina and/or titanium dioxide with the particle size of 1 nm-5 mu m and isopropanol according to the weight ratio of 1: 130, heating to 150 ℃, adding distearoyl-oxy-isopropyl aluminate with the weight 2 times that of the alumina and/or titanium dioxide, mixing uniformly, centrifuging, filtering and drying to obtain a secondary coating intermediate; and then mixing the secondary coating intermediate with dimethylformamide according to the mass ratio of 1: 300 to obtain a second mixed solution, then adding 3 times of polyvinylidene fluoride-hexafluoropropylene of the weight of the alumina and/or the titanium dioxide, then adding 5 times of polymethyl methacrylate of the weight of the alumina and/or the titanium dioxide, and uniformly stirring at 60 ℃ to obtain a second coating agent;
D. secondary coating treatment: and (C) coating the secondary coating agent on the surface of the overfeed roller disc subjected to primary coating in the step B, and drying at 80 ℃.
Example 6
The method is the same as the embodiment 3, except that a coating treatment is further included between the second plasma spraying in the step (4) and the hole sealing treatment in the step (5), and the method specifically comprises the following steps:
A. preparation of primary coating agent: titanium dioxide with the particle size of 1 nm-5 mu m and dimethylformamide are mixed according to the mass ratio of 1: 500 to prepare a first mixed solution, then adding 5 times of polyvinylidene fluoride-hexafluoropropylene in weight of the titanium dioxide, then adding 7 times of polymethyl methacrylate in weight of the titanium dioxide, and uniformly stirring at 75 ℃ to obtain a primary coating agent;
B. primary coating treatment: coating the primary coating agent on the surface of the secondary plasma sprayed overfeed roller disc, and drying at 130 ℃;
C. preparing a secondary coating agent: mixing alumina and/or titanium dioxide with the particle size of 1 nm-5 mu m and isopropanol according to the weight ratio of 1: 230, heating to 170 ℃, adding distearoyl-oxy-isopropyl aluminate with the weight 3 times that of the alumina and/or titanium dioxide, mixing uniformly, centrifuging, filtering and drying to obtain a secondary coating intermediate; and then mixing the secondary coating intermediate with dimethylformamide according to the mass ratio of 1: 500 to obtain a second mixed solution, then adding polyvinylidene fluoride-hexafluoropropylene with the weight 5 times of the weight of the alumina and/or the titanium dioxide, then adding polymethyl methacrylate with the weight 7 times of the weight of the alumina and/or the titanium dioxide, and uniformly stirring at 75 ℃ to obtain a second coating agent;
D. secondary coating treatment: and (C) coating the secondary coating agent on the surface of the overfeed roller disc subjected to primary coating in the step B, and drying at 100 ℃.
Comparative example 1
The same as example 1, except that the blasting pressure of the blasting treatment of the step (2) was 0.6MPa, the blasting time was 20 minutes, the blasting angle was 40 degrees, the blasting distance was 70mm, and the workpiece rotation speed was 40 revolutions per minute.
Comparative example 2
The same as example 1, except for the method of improving the adhesive strength of the AT coating plasma sprayed on the surface of the overfeed roller disc, the first plasma spraying was not performed, and only the second plasma spraying was performed as in example 1.
Comparative example 3
The same as example 1, except that the parameters and process of the two plasma spraying steps are different:
first plasma spraying: spraying a nickel-chromium coating, which comprises preheating the overfeed roller disc substrate to 90 ℃, spraying the nickel-chromium coating by using a spray gun of plasma spraying equipment, selecting 50 mu m nickel-chromium powder, spraying current of 450A, voltage of 45V, distance of 70mm from the spray gun, and mixing the content of the nickel-chromium coating by Ni 60 wt%: cr40wt%, and the thickness of the coating is 0.06 mm;
and (3) secondary plasma spraying: comprises spraying alumina titanium by a spray gun, wherein the spraying current is 750A, the voltage is 60V, the spraying distance is 130mm, and the thickness of the coating is 0.10 mm; in the spraying process, firstly, spraying a 0.01mm alumina titanium surface layer on an overfeed roller disc with a sprayed bottom layer, and controlling the temperature at 100 ℃; then, the temperature of the workpiece is raised to 280 ℃ in a heating mode, and then subsequent spraying is carried out; and spraying an aluminum titanium oxide coating, wherein the thickness of the coating is 0.25 mm.
The overfeed roller discs prepared in examples 1 to 6 and comparative examples 1 to 4 were subjected to experimental tests for testing the adhesive strength of the plasma sprayed AT coating on the surface of the overfeed roller discs, and the experimental data are shown in Table 1:
TABLE 1 test results of overfeed compass coating experiments for examples 1-6 and comparative examples 1-3
Item Example 1 Example 2 Example 3 Example 4 Example 5 Example 6 Comparative example 1 Comparative example 2 Comparative example 3
Adhesive strength/MPa 35 32 31 45 43 41 25 18 25
Surface roughness/Ra 4 5 5 3 4 4 7 6 6
The above data illustrate that:
1. the bonding strength of the AT ceramic coating obtained after the two specific plasma spraying in the embodiments 1-6 of the invention with the substrate is higher than that of the AT coating obtained by only performing the first plasma spraying in the comparative example 2 and the comparative example 3, and the bonding strength of the AT coating obtained by performing the two plasma spraying in the comparative example 4 but having different spraying process parameters is higher than that of the AT coating obtained by performing the two plasma spraying in the comparative example 4;
2. the bonding strength of the AT ceramic coating obtained by the specific sand blasting method of the embodiment 1-6 of the invention between the nickel-chromium bottom layer and the substrate is higher than that of the AT coating obtained by the sand blasting method of the comparative example 1;
3. the AT ceramic coating obtained by adopting the specific secondary coating method of the embodiment 4-6 of the invention has higher bonding strength with the substrate through the nickel-chromium bottom layer compared with the AT coating obtained by not carrying out secondary coating in the embodiment 1-3; wherein the bond strength and surface roughness performance parameters of example 4 are optimized.
The present embodiment is only for explaining the present invention, and it is not limited to the present invention, and those skilled in the art can make modifications of the present embodiment without inventive contribution as needed after reading the present specification, but all of them are protected by patent law within the scope of the claims of the present invention.

Claims (10)

1. A method for improving the bonding strength of an AT coating sprayed on the surface of an overfeed roller disc by plasma is characterized by comprising the following steps:
1) overfeeding a roller disc substrate;
2) carrying out sand blasting treatment;
3) first plasma spraying: spraying a nickel-chromium coating, wherein the content ratio of the nickel-chromium coating is Ni 70-90 wt%: 10 to 30 weight percent of Cr and 0.02 to 0.05mm of coating thickness;
4) and (3) secondary plasma spraying: spraying an aluminum oxide titanium coating, wherein the thickness of the coating is 0.15-0.20 mm;
5) hole sealing treatment;
6) and (5) post-treatment.
2. The method for improving the bonding strength of the plasma sprayed AT coating on the surface of the overfeed roller disc according to claim 1, wherein the method comprises the following steps: and (2) the ultra-feeding roller disc base body treatment in the step (1) comprises ultrasonic oil removal and drying of the ultra-feeding roller disc base body.
3. The method for improving the bonding strength of the plasma sprayed AT coating on the surface of the overfeed roller disc according to claim 2, wherein the method comprises the following steps: the sand blasting treatment in the step (2) comprises the steps of adopting a drum-type automatic sand blasting machine, selecting white corundum as the sand, wherein the mesh is 20-50 meshes, the sand blasting pressure is 0.4-0.5Mpa, the sand blasting time is 30-60 minutes, the sand blasting angle is 50-70 degrees, the sand blasting distance is 80-200mm, and the workpiece rotating speed is 8-30 revolutions per minute.
4. The method for improving the bonding strength of the plasma sprayed AT coating on the surface of the overfeed roller disc according to claim 3, wherein the method comprises the following steps: the sand blasting treatment in the step (2) comprises the steps of adopting a drum-type automatic sand blasting machine, selecting white corundum as the sand, wherein the grain size is 30-46 meshes, the sand blasting pressure is 0.4-0.5Mpa, the sand blasting time is 30-60 minutes, the sand blasting angle is 60 degrees, the sand blasting distance is 100-150mm, and the workpiece rotating speed is 10-20 r/min.
5. The method for improving the bonding strength of the plasma sprayed AT coating on the surface of the overfeed roller disc according to claim 4, wherein the method comprises the following steps: the first plasma spraying in the step (3) comprises the steps of preheating the overfeed roller disc substrate to 140 ℃ for 100-; the thickness of the coating is 0.02-0.05 mm.
6. The method for improving the bonding strength of the plasma sprayed AT coating on the surface of the overfeed roller disc according to claim 5, wherein the method comprises the following steps: the first plasma spraying in the step (3) comprises the steps of preheating the overfeed roller disc substrate to 120 ℃, spraying 80% Ni20% Cr of a nickel-chromium coating by using a spray gun SG100 of plasma spraying equipment of the United states of Thermich, selecting 10-38 mu m nickel-chromium powder, spraying current of 350-400A, voltage of 30-38V and distance of 80-120mm of the spray gun; the thickness of the coating is 0.02-0.05 mm.
7. The method for improving the bonding strength of the plasma sprayed AT coating on the surface of the overfeed roller disc according to claim 6, wherein the method comprises the following steps: the second plasma spraying in the step (4) comprises spraying alumina titanium by using a spray gun, wherein the spraying current is 550-700A, the voltage is 40-50V, the spraying distance is 80-120mm, and the thickness of the coating is 0.15-0.20 mm; in the spraying process, firstly, a 0.02-0.05mm alumina titanium surface layer is sprayed on the overfeed roller disc with the bottom layer sprayed, and the temperature is controlled at 130-; then the temperature of the workpiece is raised to 200-220 ℃ by a heating mode, and then the subsequent spraying is carried out.
8. The method for improving the bonding strength of the plasma sprayed AT coating on the surface of the overfeed roller disc according to claim 7, wherein the method comprises the following steps: the second plasma spraying in the step (4) comprises the steps of spraying alumina titanium by using a plasma device SG100 spray gun of the United states of America thermal company, wherein the spraying current is 600A, the voltage is 45V, the spraying distance is 100mm, and the thickness of the coating is 0.15-0.20 mm; in the spraying process, firstly, a 0.02-0.05mm alumina titanium surface layer is sprayed on the overfeed roller disc on which the bottom layer is sprayed, and the temperature is controlled to be about 150 ℃; and then, the temperature of the workpiece is raised to 200-220 ℃ by a heating mode, and subsequent spraying is carried out, wherein the high temperature of the matrix can effectively ensure that AT powder is molten in the spraying process, but the temperature of the overfeed roller disc after spraying is ensured to be less than 250 ℃ in the spraying process.
9. The method for improving the bonding strength of the plasma sprayed AT coating on the surface of the overfeed roller disc according to claim 8, wherein the method comprises the following steps: and (5) hole sealing treatment comprises hole sealing treatment of the coating by using paraffin, and the ceramic coating on the surface of the overfeed roller disc is required to be completely soaked, so that no exposed part can be coated.
10. The method for improving the bonding strength of the plasma sprayed AT coating on the surface of the overfeed roller disc according to any one of claims 1 to 9, wherein the method comprises the following steps: a coating treatment is further included between the second plasma spraying in the step (4) and the hole sealing treatment in the step (5), and the method specifically comprises the following steps:
A. preparation of primary coating agent: mixing alumina and/or titanium dioxide with the particle size of 1 nm-5 mu m and dimethylformamide according to the mass ratio of 1: (300-500) mixing to prepare a first mixed solution, then adding 3-5 times of polyvinylidene fluoride-hexafluoropropylene of the weight of alumina and/or titanium dioxide, then adding 5-7 times of polymethyl methacrylate of the weight of alumina and/or titanium dioxide, and uniformly stirring at 60-75 ℃ to obtain a primary coating agent;
B. primary coating treatment: coating the primary coating agent on the surface of the secondary plasma sprayed overfeed roller disc, and drying at the temperature of 120-;
C. preparing a secondary coating agent: mixing alumina and/or titanium dioxide with the particle size of 1 nm-5 mu m and isopropanol according to the weight ratio of 1: (130-230), heating to 150-170 ℃, adding distearoyl-oxy-isopropyl aluminate with the weight 2-3 times that of the alumina and/or titanium dioxide, uniformly mixing, centrifugally filtering, and drying to obtain a secondary coating intermediate; and then mixing the secondary coating intermediate with dimethylformamide according to the mass ratio of 1: (300-500) mixing to prepare a second mixed solution, then adding 3-5 times of polyvinylidene fluoride-hexafluoropropylene of the weight of alumina and/or titanium dioxide, then adding 5-7 times of polymethyl methacrylate of the weight of alumina and/or titanium dioxide, and uniformly stirring at 60-75 ℃ to obtain a secondary coating agent;
D. secondary coating treatment: and (C) coating the secondary coating agent on the surface of the overfeed roller disc subjected to primary coating in the step B, and drying at 80-100 ℃.
CN202111146402.9A 2021-09-28 2021-09-28 Method for improving bonding strength of plasma spraying AT coating on surface of overfeed roller disc Pending CN113913728A (en)

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