CN113416911A - Composite ceramic coating and preparation method and application thereof - Google Patents
Composite ceramic coating and preparation method and application thereof Download PDFInfo
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- CN113416911A CN113416911A CN202110685953.6A CN202110685953A CN113416911A CN 113416911 A CN113416911 A CN 113416911A CN 202110685953 A CN202110685953 A CN 202110685953A CN 113416911 A CN113416911 A CN 113416911A
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C4/00—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge
- C23C4/04—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge characterised by the coating material
- C23C4/06—Metallic material
- C23C4/067—Metallic material containing free particles of non-metal elements, e.g. carbon, silicon, boron, phosphorus or arsenic
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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
- C23C4/02—Pretreatment of the material to be coated, e.g. for coating on selected surface areas
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C4/00—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge
- C23C4/04—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge characterised by the coating material
- C23C4/06—Metallic material
- C23C4/08—Metallic material containing only metal elements
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C4/00—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge
- C23C4/12—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge characterised by the method of spraying
- C23C4/129—Flame spraying
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Abstract
The invention relates to the field of coatings, in particular to a composite ceramic coating and a preparation method and application thereof. The composite ceramic coating provided by the application comprises a nickel-based molybdenum-nickel-boron ceramic coating and a chromium coating. Wherein, the outer nickel-based molybdenum-nickel-boron ceramic coating plays a role in preventing the metal matrix from being corroded and improving the wear resistance; meanwhile, the lattice constant difference between the chromium and the nickel-based molybdenum-nickel-boron ceramic and the transmission line hardware is small, so that the stress generated when the nickel-based molybdenum-nickel-boron ceramic coating is deposited on the surface of the metal substrate is reduced by adding the chromium coating on the metal substrate and the nickel-based molybdenum-nickel-boron ceramic coating, the nickel-based molybdenum-nickel-boron ceramic coating is prevented from cracking and falling off from the surface of the metal substrate, and the corrosion resistance of the nickel-based molybdenum-nickel-boron ceramic coating is improved. The composite ceramic coating, the preparation method and the application thereof can solve the technical problem that the transmission line hardware is corroded and laid down due to abrasion and damage of the surface coating.
Description
Technical Field
The invention relates to the field of coatings, in particular to a composite ceramic coating and a preparation method and application thereof.
Background
With the rapid development of economy, the demand for electric power is increasing day by day, and safe and reliable power supply is important, and the reliability and firmness of a power transmission network are the basis of power supply.
Overhead transmission lines in the power transmission network are composed of wires, pole (iron) towers, hardware fittings, insulators and the like, and span various landforms, environments and meteorological areas; the power transmission line exposed outdoors is influenced by atmosphere and various environment media, all unit parts are corroded to damage the galvanized layers of the steel leg iron caps of the pole (iron) tower, the hardware and the insulator, the mechanical property of the iron tower is greatly reduced due to corrosion, the reduction strength of the hardware is reduced, the connection effect of the steel leg iron caps of the insulator is reduced, and further, the disconnection or disconnection of a connecting line is caused, even the tower is inverted, and power failure tripping and major safety production accidents are caused; in the prior art, a zinc ring is additionally arranged on the periphery of an iron cap of a high-voltage direct-current porcelain and a glass insulator, so that electrolytic corrosion of the iron cap is inhibited, and the connecting effect between the iron cap and a last insulator steel pin is improved; the steel strand is coated with conductive grease before crimping, the joint of the aluminum sleeve and the ground wire is coated with the conductive grease after crimping, the joint of the aluminum sleeve and the steel anchor is coated with sealing materials such as conductive grease or vaseline to ensure that a gap is sealed, the tension clamp drainage plate bolt adopts a stainless steel bolt, the steel anchor section adopts wear-resistant coatings such as glass flakes, and the chemical corrosion of the ground wire ice melting clamp subjected to ice melting modification is inhibited; the method comprises the steps of developing a low-acidity environment-friendly rust layer pretreatment solution by using tannic acid as a rust layer conversion agent and combining a phosphorization corrosion prevention system, pretreating a rust layer on the surface of a transmission tower by using a chemical method, and converting the rust layer on the surface of rusted Q235 steel into inertia, so that the transmission tower has stronger corrosion resistance; however, the above method can only slow down the corrosion of metals such as steel leg iron caps of pole (iron) towers, hardware fittings and insulators, and cannot prevent the occurrence of metal corrosion, and the nickel-based molybdenum-nickel-boron ceramics have a series of advantages such as high hardness, high temperature resistance and atmospheric corrosion resistance, so that the nickel-based molybdenum-nickel-boron ceramic coating can prevent the occurrence of metal corrosion by covering the metal surfaces of the pole (iron) towers, the hardware fittings, the steel leg iron caps of insulators and the like with the nickel-based molybdenum-nickel-boron ceramic coating.
The difference between the crystal structure and the lattice constant of the metal substrate and the nickel-based molybdenum-nickel-boron ceramic is large, and the mismatching degree between the crystal structure and the lattice constant is large, so that when the nickel-based molybdenum-nickel-boron ceramic coating is deposited on the surface of the metal substrate, great stress is generated, the nickel-based molybdenum-nickel-boron ceramic coating on the surface of the metal substrate is cracked and even falls off from the surface of the metal substrate, and the corrosion resistance is reduced.
Disclosure of Invention
In view of the above, the application provides a composite ceramic coating, and a preparation method and an application thereof, which can solve the technical problem of corrosion off-shelf of a power transmission line hardware tool caused by abrasion and damage of a surface coating.
A first aspect of the present application provides a composite ceramic coating comprising an outer coating and an inner coating;
the outer coating is a nickel-based molybdenum-nickel-boron ceramic coating,
the inner layer coating is a chromium coating.
Preferably, the composite ceramic coating further comprises an intermediate coating;
the middle coating layer covers the inner coating layer;
the intermediate coating is a nickel coating.
The nickel coating is added between the chromium coating and the nickel-based molybdenum-nickel-boron ceramic coating to serve as a buffer layer, so that the stress generated in the matrix, the chromium coating and the nickel-based molybdenum-nickel-boron ceramic coating is buffered.
Preferably, the composite ceramic coating further comprises a surface coating;
the surface coating covers the outer coating;
the surface coating is a nickel coating.
It should be noted that, on one hand, nickel may be used as a buffer layer, and on the other hand, since nickel-based molybdenum-nickel-boron ceramic is difficult to melt, the nickel-based molybdenum-nickel-boron ceramic powders are not very tightly bonded, so that the nickel-based molybdenum-nickel-boron ceramic coating with a low melting point is coated on the surface of the nickel-based molybdenum-nickel-boron ceramic coating and may be used as a pore-sealing layer, thereby reducing the porosity of the nickel-based molybdenum-nickel-boron ceramic coating.
It should also be noted that the outer coating is located on the outer layer of the composite ceramic coating, the inner coating is located on the innermost layer of the composite ceramic coating and is used for coating on the surface of the substrate, the middle coating is located between the outer coating and the inner coating, and the surface coating is located on the outer side of the outer coating.
Preferably, the thickness of the inner coating is 90-100 μm; the thickness of the intermediate coating is 70-80 μm; the thickness of the outer coating is 140-150 μm; the thickness of the surface coating is 70-100 μm.
In a second aspect, the present application provides a method for preparing a composite ceramic coating, comprising the steps of:
step 1, spraying an inner coating on the surface of a metal matrix by adopting a supersonic flame spraying technology;
step 2, spraying an outer coating outside the inner coating by adopting a supersonic flame spraying technology;
the outer coating is a nickel-based molybdenum-nickel-boron ceramic coating,
the inner layer coating is a chromium coating.
It should be noted that the supersonic flame spraying technology can accelerate the spraying particles in the molten or semi-molten state to supersonic speed, therefore, when the supersonic flame spraying technology is used for spraying the chromium coating on the surface of the metal substrate, under the combined action of the pressure and the temperature generated when the chromium particles impact the metal substrate, the inter-atomic diffusion occurs on the interface of the chromium particles and the metal substrate, and the metallurgical bonding of the chromium coating and the metal substrate is realized, so that the bonding strength between the coating and the substrate is further improved, and the problems of cracking and falling off from the surface of the metal substrate, the reduction of the corrosion resistance and the like of the nickel-based molybdenum-nickel-boron ceramic coating are solved.
Preferably, before the step 2, the method further comprises: pretreating nickel-based molybdenum nickel boron ceramic powder;
the pretreated nickel-based molybdenum nickel boron ceramic powder comprises: filtering the nickel-based molybdenum-nickel-boron ceramic powder by using a filter screen;
the size of the sieve pores of the filter screen is 1-5 mu m.
It should be noted that the nickel-based molybdenum-nickel-boron ceramic powder with the particle size of 1 μm to 5 μm can be obtained by filtering with a filter screen with the mesh size of 1 μm to 5 μm, wherein the particle size of the nickel-based molybdenum-nickel-boron ceramic powder with the fine particle size can be filled between the nickel-based molybdenum-nickel-boron ceramic powders with the coarse particle size, so that the porosity of the nickel-based molybdenum-nickel-boron ceramic coating can be further reduced, and meanwhile, the particle size of the nickel-based molybdenum-nickel-boron ceramic powder within 5 μm can also avoid the reduction of the compactness of the nickel-based molybdenum-nickel-boron ceramic coating caused by the fact that the nickel-based molybdenum-nickel-boron ceramic powder with the coarse particle size cannot be fully melted.
Preferably, before step 1, the method further comprises: pretreating a metal substrate;
the pretreated metal substrate includes: and (4) deoiling, polishing and shot blasting the metal matrix.
The metal substrate has the defects of dirt such as residual grease on the surface and unevenness, the metal oxide layer can cause difficult combination of the coating and the substrate, and the combination strength between the coating and the substrate is reduced; after the surface of the metal matrix is degreased, the metal matrix is polished to be flat, and the metal oxide layer is eliminated by shot blasting, on one hand, the stress remained in the coating after spraying and depositing the coating is reduced, and on the other hand, the bonding difficulty between the coating and the matrix is reduced, so that the bonding strength between the coating and the metal matrix is improved.
Preferably, after step 1 and before step 2, the method further comprises: spraying an intermediate coating on the surface of the inner coating by adopting a supersonic flame spraying technology;
the intermediate coating is a nickel coating.
Preferably, after the step 2, the method further comprises: spraying a surface coating on the surface of the inner coating by adopting a supersonic flame spraying technology;
the surface coating is a nickel coating.
The third aspect of the application provides the application of the composite ceramic coating on the surface of the transmission line hardware.
In summary, the present application provides a composite ceramic coating, a method of making the same, and applications thereof; wherein the composite ceramic coating comprises an outer coating and an inner coating; the outer coating is a nickel-based molybdenum-nickel-boron ceramic coating, and the inner coating is a chromium coating. The nickel-based molybdenum-nickel-boron ceramic coating has high hardness, high temperature resistance and atmospheric corrosion resistance, so that the nickel-based molybdenum-nickel-boron ceramic coating on the outer layer plays a role in improving the corrosion resistance and wear resistance of the metal matrix; the lattice constant difference between the chromium and the nickel-based molybdenum-nickel-boron ceramic is small, the chromium and the nickel-based molybdenum-nickel-boron ceramic belong to the same substance as metal matrixes such as steel feet and iron caps of hardware fittings and insulators, and the lattice constant is close to the same substance, so that the stress generated when the nickel-based molybdenum-nickel-boron ceramic coating is deposited on the surface of the metal matrix is reduced, the nickel-based molybdenum-nickel-boron ceramic coating is prevented from cracking and falling off from the surface of the metal matrix, and the corrosion resistance of the nickel-based molybdenum-nickel-boron ceramic coating and the bonding strength of the matrix are improved.
Description of the drawings:
in order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without inventive exercise.
FIG. 1 is a flow chart of a supersonic flame spray technique for producing coatings, as used in an embodiment of the present invention;
FIG. 2 is a scanning electron microscope image of a Cr/Ni-based Mo-Ni-B/Ni composite ceramic coating prepared in example 4 of the present invention;
FIG. 3 is a cross-sectional view of a Cr/Ni-based Mo-Ni-B/Ni composite ceramic coating prepared in example 4 of the present invention.
The specific implementation mode is as follows:
the application provides a composite ceramic coating and a preparation method and application thereof, which can solve the technical problem of corrosion performance off-shelf of a transmission line hardware fitting caused by abrasion and damage of a surface coating.
The technical solutions in the embodiments of the present application will be described clearly and completely below, and it should be understood that the described embodiments are only a part of the embodiments of the present application, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
The reagents or raw materials used in the following examples are commercially available or self-made.
Example 1
The application embodiment 1 provides a chromium/nickel-based molybdenum-nickel-boron composite ceramic coating, and the preparation method comprises the following steps:
1. the preparation process comprises the following steps:
pretreating a base material: and carrying out pretreatment such as oil removal, polishing, shot blasting and the like on the surface of the transmission line hardware.
Preparing nickel-based molybdenum nickel boron ceramic powder: firstly, preparing nickel-based molybdenum-nickel-boron ceramic by adopting vacuum pressure sintering, crushing the nickel-based molybdenum-nickel-boron ceramic, then putting the crushed nickel-based molybdenum-nickel-boron ceramic into a container, putting the container into a 101A-2 type electrothermal blowing constant-temperature drying oven, drying the container for 30 minutes at the temperature of 110 ℃, and finally placing the dried powder into a vibration screening machine by using a 5-micrometer filter screen to screen the powder to obtain nickel-based molybdenum-nickel-boron ceramic powder;
wherein, the granularity of the nickel-based molybdenum nickel boron ceramic powder is 1-5 μm, the components are 44-48 wt% of molybdenum, 42-45 wt% of nickel and the balance of boron.
Preheating supersonic flame spraying equipment: and sequentially starting the control system, the spray gun cooling system, the gas supply system and the dust removal device.
2. The process for preparing the chromium/nickel-based molybdenum-nickel-boron composite ceramic coating comprises the following steps:
step 2.1: preparing an inner layer coating chromium coating by adopting a supersonic flame spraying technology: after the supersonic flame spraying equipment is started, combustion gas enters a combustion chamber in the supersonic flame spraying equipment from a small hole, heat energy released during combustion heat release in the combustion chamber enables chromium particles to be melted and violently expanded, the chromium particles are constrained by a nozzle when passing through a Laval nozzle to form a supersonic chromium particle flame flow, then the supersonic chromium particle flame flow is further heated and accelerated through a long spray pipe with an equal cross section, and finally the supersonic chromium particle flame flow is sprayed to the surface of a power transmission line hardware; the high-speed chromium particles impact the surface of the transmission line hardware to generate pressure, and simultaneously, under the coordination of the temperature carried by the molten chromium particles, the chromium particles and the surface of the transmission line hardware are subjected to interatomic mutual diffusion, so that metallurgical bonding is formed between the chromium coating and the transmission line hardware, and the chromium/nickel-based molybdenum-nickel-boron ceramic composite ceramic coating is obtained;
wherein, the distance between the equal-section long spray pipe and the surface of the transmission line hardware fitting is 230 mm-260 mm, preferably 230mm, the powder feeding voltage is 7V-10V, preferably 7V, the spraying thickness of the chromium coating is about 100 μm, and the particle size of the chromium particles is 2 μm-5 μm.
Step 2.2: preparing an outer coating nickel-based molybdenum-nickel-boron ceramic coating by adopting a supersonic flame spraying technology: the preparation process is different from the preparation of the chromium coating, in that the powder feeding voltage is preferably 10V, and the spraying thickness is about 150 mu m.
Example 2
The application embodiment 2 provides a chromium/nickel-based molybdenum-nickel-boron composite ceramic coating, and the preparation method comprises the following steps:
1. the preparation process comprises the following steps:
pretreating a base material: and carrying out pretreatment such as oil removal, polishing, shot blasting and the like on the surface of the transmission line hardware.
Preparing nickel-based molybdenum nickel boron ceramic powder: firstly, preparing nickel-based molybdenum-nickel-boron ceramic by adopting vacuum pressure sintering, crushing the nickel-based molybdenum-nickel-boron ceramic, then putting the crushed nickel-based molybdenum-nickel-boron ceramic into a container, putting the container into a 101A-2 type electrothermal blowing constant-temperature drying oven, drying the container for 30 minutes at the temperature of 110 ℃, and finally placing the dried powder into a vibration screening machine by using a 5-micrometer filter screen to screen the powder to obtain nickel-based molybdenum-nickel-boron ceramic powder;
wherein, the granularity of the nickel-based molybdenum nickel boron ceramic powder is 1-5 μm, the components are 44-48 wt% of molybdenum, 42-45 wt% of nickel and the balance of boron.
Preheating supersonic flame spraying equipment: and sequentially starting the control system, the spray gun cooling system, the gas supply system and the dust removal device.
2. Process for preparing chromium/nickel-based molybdenum-nickel-boron composite ceramic coating
Step 2.1: preparing an inner layer coating chromium coating by adopting a supersonic flame spraying technology: after the supersonic flame spraying equipment is started, combustion gas enters a combustion chamber in the supersonic flame spraying equipment from a small hole, heat energy released during combustion and heat release in the combustion chamber enables chromium particles to be melted and violently expanded, the chromium particles are constrained by a nozzle when passing through a Laval nozzle to form a supersonic chromium particle flame flow, then the supersonic chromium particle flame flow is further heated and accelerated through a long spray pipe with an equal cross section, and finally the supersonic chromium particle flame flow is sprayed on the surface of an insulator iron cap of a power transmission line hardware; the high-speed chromium particles impact the surface of the hardware fitting of the power transmission line to generate pressure, and simultaneously, under the coordination of the temperature of the chromium particles, the chromium particles and the surface of the hardware fitting of the power transmission line are subjected to interatomic mutual diffusion, so that metallurgical bonding is formed between the chromium coating and the insulator iron cap of the hardware fitting of the power transmission line, the chromium and the hardware fitting of the power transmission line belong to metals, the physical properties such as lattice parameters and the like are similar, and the residual stress of spraying the chromium coating on the surface of the hardware fitting of the power transmission line is small, so that the chromium coating is not easy to fall off from the surface of the insulator iron cap of the hardware fitting of the power transmission line;
wherein, the distance between the equal-section long spray pipe and the surface of the transmission line hardware fitting is 230 mm-260 mm, preferably 230mm, the powder feeding voltage is 7V-10V, preferably 7V, the spraying thickness of the chromium coating is about 100 μm, and the particle size of the chromium particles is 2 μm-5 μm.
Step 2.2: preparing a middle coating nickel coating by adopting a supersonic flame spraying technology: the preparation process differs from the chromium coating step in that the thickness of the intermediate coating nickel coating is about 70 μm.
Step 2.3: preparing an outer coating nickel-based molybdenum nickel boron coating by adopting a supersonic flame spraying technology: the preparation process is different from the chromium coating preparation step in that the powder feeding voltage is preferably selected to be 10V, and the spraying thickness is about 150 mu m.
Example 3:
the embodiment 3 of the present application provides a first chromium/nickel-based molybdenum-nickel-boron/nickel composite ceramic coating, and the preparation process of the first chromium/nickel-based molybdenum-nickel-boron/nickel composite ceramic coating is different from the preparation process of the chromium/nickel-based molybdenum-nickel-boron composite ceramic coating in the embodiment 2, in that after the outer layer coating nickel-based molybdenum-nickel-boron ceramic coating is prepared by using the supersonic flame spraying technology, the preparation method further comprises the step of preparing a surface coating nickel coating by using the supersonic flame spraying technology, wherein the thickness of the surface coating nickel coating is about 75m, and the thickness of the prepared chromium/nickel-based molybdenum-nickel-boron/nickel composite ceramic coating is about 395 μm.
Example 4:
example 4 of the present application provides a second cr/ni-based mo-ni-b/ni composite ceramic coating, which is prepared by a process different from that of example 3, in that the cr coating of the inner layer is prepared to have a thickness of about 100 μm and the ni coating of the middle layer is prepared to have a thickness of about 80 μm; the thickness of the nickel-based molybdenum nickel boron of the outer coating is about 150 μm, the thickness of the nickel coating of the surface coating is about 100 μm, and the total thickness of the coating is about 430 μm.
Example 5:
example 5 of the present application provides a third cr/ni-based mo-ni-b/ni composite ceramic coating, which is prepared according to a process different from that of example 3, in that the cr coating of the inner layer coating is about 80 μm thick and the ni coating of the middle layer coating is about 85 μm thick; the thickness of the nickel-based molybdenum nickel boron of the outer coating is about 145 μm, the thickness of the nickel coating of the surface coating is about 80 μm, and the total thickness of the coating is about 390 μm.
Example 6
In this example 6, the power transmission line hardware coatings prepared in examples 1 to 5 are respectively used as the power transmission line hardware with galvanized surfaces of samples 1 to 5 as a sample 6, then a metallographic microscope is used for detecting the thickness of the coatings in the samples 1 to 6, a microhardness tester is used for detecting the microhardness of the coatings of the samples 1 to 6, a tape traction test is used for detecting the bonding strength of the samples 1 to 6, a wear tester is used for detecting the wear resistance of the samples 1 to 6, the samples 1 to 6 are placed in a 10% neutral salt solution for detecting the corrosion resistance, and the results are shown in table 1.
It can be understood from the microhardness and wear resistance data of the sample 6 and the samples 1 to 5 that the transmission line hardware coating of the samples 1 to 5 comprises the nickel-based molybdenum-nickel-boron ceramic coating, so that the hardness and wear resistance of the coating are improved;
it can be understood from the data of the bonding strength of samples 3 to 5 that as the thickness of the chromium/nickel-based molybdenum nickel boron/nickel composite ceramic coating increases, the bonding strength decreases, because as the thickness of the coating increases, the internal stress applied thereto increases, thereby resulting in a decrease in the bonding strength of the coating to the substrate.
The foregoing is only a preferred embodiment of the present application and it should be noted that modifications can be made by those skilled in the art without departing from the principle of the present application and these modifications should also be considered as the protection scope of the present application.
Claims (10)
1. A composite ceramic coating, wherein the composite ceramic coating comprises an outer coating and an inner coating;
the outer coating is a nickel-based molybdenum-nickel-boron ceramic coating;
the inner layer coating is a chromium coating.
2. The composite ceramic coating of claim 1, further comprising an intermediate coating;
the middle coating layer covers the inner coating layer;
the intermediate coating is a nickel coating.
3. The composite ceramic coating of claim 2, further comprising a surface coating;
the surface coating covers the outer coating;
the surface coating is a nickel coating.
4. The composite ceramic coating of claim 3, wherein the inner coating has a thickness of 90 μm to 100 μm; the thickness of the intermediate coating is 70-80 μm; the thickness of the outer coating is 140-150 μm; the thickness of the surface coating is 70-100 μm.
5. The preparation method of the composite ceramic coating is characterized by comprising the following steps of:
step 1, spraying an inner coating on the surface of a metal matrix by adopting a supersonic flame spraying technology;
step 2, spraying an outer coating outside the inner coating by adopting a supersonic flame spraying technology;
the outer coating is a nickel-based molybdenum-nickel-boron ceramic coating;
the inner layer coating is a chromium coating.
6. The method for preparing a composite ceramic coating according to claim 5, wherein the step 2 is preceded by: pretreating nickel-based molybdenum nickel boron ceramic powder;
the pretreated nickel-based molybdenum nickel boron ceramic powder comprises: filtering the nickel-based molybdenum-nickel-boron ceramic powder by using a filter screen;
the size of the sieve pores of the filter screen is 1-5 mu m.
7. The method for preparing a composite ceramic coating according to claim 5, wherein the step 1 is preceded by: pretreating a metal substrate;
the pretreated metal substrate includes: and (4) deoiling, polishing and shot blasting the metal matrix.
8. The method for preparing a composite ceramic coating according to claim 5, wherein after the step 1 and before the step 2, the method further comprises: spraying an intermediate coating on the surface of the inner coating by adopting a supersonic flame spraying technology;
the intermediate coating is a nickel coating.
9. The method for preparing a composite ceramic coating according to claim 8, wherein after the step 2, the method further comprises: spraying a surface coating on the surface of the outer coating by adopting a supersonic flame spraying technology;
the surface coating is a nickel coating.
10. Use of the composite ceramic coating according to any one of claims 1 to 4 and the composite ceramic coating prepared by the preparation method according to any one of claims 5 to 9 on the surface of power transmission line hardware.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110685953.6A CN113416911B (en) | 2021-06-21 | 2021-06-21 | Composite ceramic coating and preparation method and application thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110685953.6A CN113416911B (en) | 2021-06-21 | 2021-06-21 | Composite ceramic coating and preparation method and application thereof |
Publications (2)
| Publication Number | Publication Date |
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| CN113416911A true CN113416911A (en) | 2021-09-21 |
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| CN1431335A (en) * | 2003-01-17 | 2003-07-23 | 西安交通大学 | Method for preparing nickel based self fluxing alloy coat on substrate of copper or copper alloy |
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| CN1431335A (en) * | 2003-01-17 | 2003-07-23 | 西安交通大学 | Method for preparing nickel based self fluxing alloy coat on substrate of copper or copper alloy |
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| 金懋昌主编: "《真空技术》", 31 May 1995 * |
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