CN113755780A - Composite coating for titanium alloy gasket and preparation method thereof - Google Patents
Composite coating for titanium alloy gasket and preparation method thereof Download PDFInfo
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- CN113755780A CN113755780A CN202110910069.8A CN202110910069A CN113755780A CN 113755780 A CN113755780 A CN 113755780A CN 202110910069 A CN202110910069 A CN 202110910069A CN 113755780 A CN113755780 A CN 113755780A
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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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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C4/00—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge
- C23C4/04—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge characterised by the coating material
- C23C4/06—Metallic material
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C4/00—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge
- C23C4/04—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
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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
Abstract
The invention discloses a composite coating for a titanium alloy gasket and a preparation method thereof, wherein the composite coating consists of a nickel-based metal transition layer with the thickness of 0.06mm and a ceramic surface layer with the thickness of 0.3-0.4 mm; the nickel-based metal transition layer comprises the following chemical components in percentage by mass: 60-85% of Ni, 10-30% of Cr, 3-6% of B, 3-6% of Si, 2-5% of Fe and 2-5% of Mo; the ceramic surface layer comprises the following chemical components in percentage by mass: al (Al)2O3 70~90%、TiO2 15~30%、ZrO23-10%. The preparation method of the composite coating comprises the following steps: firstly, adopting a surface cleaning and compressed air sand blasting coarsening mode to remove oil stains, impurities and the like on the surface of the titanium alloy gasket, and then adopting supersonic flameA layer of uniform and compact insulating, wear-resistant and corrosion-resistant composite coating is prepared by a spraying technology and a high-speed plasma spraying technology so as to improve the insulating, wear-resistant and corrosion-resistant characteristics of the titanium alloy gasket, isolate a contact potential and avoid galvanic corrosion, thereby improving the sealing reliability of pipeline system equipment and accessories.
Description
Technical Field
The invention relates to the field of thermal spraying coatings, in particular to a composite coating for a titanium alloy gasket and a preparation method thereof.
Background
The washer is a part which is padded between a connected piece and a nut, is generally a flat metal ring, and is made of stainless steel, tool steel and the like. A large number of metal gaskets are needed in the installation and use processes of ship pipeline system equipment and accessories, and common stainless steel gaskets and tool steel gaskets have poor corrosion resistance in the marine environment and short service life, so that the use requirements of equipment cannot be met. The titanium has the characteristics of high specific strength, good heat resistance, excellent corrosion resistance and the like, and compared with the common gasket, the titanium alloy gasket has stronger marine environment corrosion resistance, so that the titanium alloy gasket is widely used for sealing connection of a ship pipeline system.
Due to the complex structure and function, the ship pipeline system equipment and accessories use a large amount of metal materials of different materials, such as copper alloy, titanium alloy, ship steel and the like. Under the condition that different metal connection phenomena, such as connection among copper alloy, titanium alloy and steel, inevitably exist in the service process of equipment and accessories made of different materials, the phenomenon of galvanic corrosion is easily caused by large potential difference among the different materials, and the corrosion of low-potential metal is accelerated, so that the rapid corrosion failure of the equipment is caused. Because the titanium alloy has higher potential, when the titanium alloy is used as a gasket, materials such as copper alloy, ship body steel and the like connected with the titanium alloy are easy to generate galvanic corrosion, and the service performance of the equipment is seriously influenced.
The main technology for solving the problem of galvanic corrosion of titanium alloy in the prior art is to prepare an insulating coating or an oxide layer on the surface of the titanium alloy, and isolate the contact potential through insulation protection, so as to avoid the occurrence of galvanic corrosion. For example, the invention patent with the application number of 201310459701.7 provides an insulating coating with the main components of film-forming resin, organic soil and silicon dioxide, which is applied to the surface of titanium alloy by spraying, brushing or rolling, and a paint film is obtained after drying and curing for 7 days, wherein the thickness of the paint film is about 50 mu m, the bonding strength is more than or equal to 13MPa, and the insulation resistance is more than or equal to 1011Omega. Patent application No. 201710492839.5The insulating coating mainly comprising film forming resin, nitrile rubber, epoxy resin, organic soil and silicon dioxide is applied to the surface of the titanium alloy, dried and cured at room temperature to obtain an insulating protective paint film, the thickness of the paint film is about 50 mu m, the bonding strength is not less than 40MPa, and the insulating resistance is not less than 1011Omega. The invention patent with application number 201711206378.7 provides an insulating coating which mainly comprises organic silicon resin, low-melting-point glass frit, pigment, ceramic microspheres and aluminum oxide, the insulating coating is applied to the surface of a titanium alloy in a spraying, brushing or rolling coating mode, and is dried and cured to form a film, and the film has good high-temperature resistance, can resist high temperature up to 400 ℃ for a long time, and has good electrical insulating property. The invention patent with application number 201410668826 proposes to prevent the corrosion of titanium alloy by anodizing the titanium alloy and isolating the coated fabric of the contact surface and painting the outer surface of the equipment. The insulating protective layer prepared on the surface of the titanium alloy by adopting the method has the problem of poor mechanical properties, mainly shows that the insulating protective layer has poor tensile strength, compressive strength, wear resistance and other properties, cannot meet the requirements of large-load assembly and use of the titanium alloy gasket, and meanwhile, the protective layer taking organic matters as main components has poor ageing resistance and is easy to lose efficacy in the marine environment. At present, no patent of spraying an insulating, wear-resistant and corrosion-resistant composite coating on the surface of a titanium alloy gasket is provided for solving the problems.
Disclosure of Invention
In order to solve the defects in the prior art, the invention provides a composite coating for a titanium alloy gasket and a preparation method thereof, wherein a composite coating with electric insulation, high hardness, high bonding strength, high density, good wear resistance and good corrosion resistance is prepared on the surface of the titanium alloy gasket by adopting a coating component composite optimization design and adopting a supersonic flame spraying and high-speed plasma spraying process, so that the insulation, wear resistance and corrosion resistance characteristics of the titanium alloy gasket are improved, a contact potential is isolated, galvanic corrosion is avoided, and the sealing reliability of pipeline system equipment and accessories is improved.
In order to achieve the purpose, the invention adopts the specific scheme that:
a composite coating for a titanium alloy gasket is composed of a nickel-based metal transition layer with the thickness of 0.06mm and a ceramic surface layer with the thickness of 0.3-0.4 mm;
the nickel-based metal transition layer comprises the following chemical components in percentage by mass: 60-85% of Ni, 10-30% of Cr, 3-6% of B, 3-6% of Si, 2-5% of Fe and 2-5% of Mo;
the ceramic surface layer comprises the following chemical components in percentage by mass: al (Al)2O3 70~90%、TiO2 15~30%、ZrO2 3~10%。
A preparation method of a composite coating for a titanium alloy gasket mainly comprises the following steps:
s1, surface cleaning
Cleaning the surface of the titanium alloy gasket by using acetone and absolute ethyl alcohol to remove oil stains and ensure that the surface of the gasket is clean;
s2, sandblasting coarsening
Carrying out sand blasting and coarsening on the surface by adopting 16-mesh and 24-mesh mixed brown corundum sand grains with the mass ratio of 1: 1-3: 1, wherein compressed air for sand blasting is required to be dry and oilless, the air pressure is 0.6-0.8 MPa, the spraying angle is 90 +/-10 degrees, the sand blasting distance is 0.1-0.2 m, and the sand blasting is carried out until the matte fresh metal surface is exposed on the surface of the titanium alloy gasket;
s3 coating preparation
S31, fixing the titanium alloy gasket on a spraying tool, preparing a nickel-based metal transition layer on the surface of the titanium alloy gasket by adopting a supersonic flame spraying process, wherein the thickness of the nickel-based metal transition layer is 0.06mm, the fuel is propane and air, the surface of the titanium alloy gasket needs to be preheated to be more than 50 ℃ before spraying, the surface temperature of the titanium alloy gasket needs to be less than 150 ℃ during spraying, and the coating is prevented from overheating by adopting multi-pass spraying;
s32, preparing a ceramic surface layer with the thickness of 0.3-0.4 mm on the surface of the nickel-based metal transition layer by adopting a high-speed plasma spraying process, wherein the spraying gas is argon and hydrogen, the surface of the titanium alloy gasket needs to be preheated to more than 50 ℃ before spraying, the surface temperature of the gasket needs to be less than 150 ℃ in the spraying process, and the coating is prevented from overheating by adopting multi-pass spraying;
s4 grinding and polishing composite coating
Fixing the titanium alloy washer on a plane grinder, grinding the surface of the titanium alloy washer, detecting the thickness of the composite coating through a nondestructive thickness gauge to ensure that the final thickness of the composite coating is 0.25-0.35 mm, and after grinding, dipping diamond grinding paste into scouring pad to polish the surface of the coating to ensure that the surface smoothness of the coating is less than or equal to 1.6 microns.
Further, in step S31, the specific process parameters for preparing the nickel-based metal transition layer on the surface of the titanium alloy gasket by using the supersonic flame spraying process are as follows: the air pressure is 0.6-0.8 MPa, the propane pressure is 0.5-0.7 MPa, the powder feeding speed is 25-50 g/min, the spraying distance is 180-220 mm, the spraying angle is 60-90 degrees, the spraying speed is 400-600 mm/s, and the spraying step distance is 2.5-3.5 mm.
Further, in step S32, the specific process parameters for preparing a ceramic surface layer on the surface of the nickel-based metal transition layer by using the high-speed plasma spraying process are as follows: the spraying current is 680-800A, the spraying voltage is 45-60V, the main gas pressure is 0.5-0.8 MPa, the main gas flow is 50-80L/min, the auxiliary gas pressure is 0.4-0.6 MPa, the auxiliary gas flow is 4-10L/min, the carrier gas flow is 5-8L/min, the powder feeding speed is 30-60 g/min, the spraying distance is 90-110 mm, the spraying angle is 60-90 degrees, the spraying speed is 400-600 mm/s, and the spraying step distance is 2.5-3.5 mm.
Has the advantages that:
by adopting the technical scheme and the preparation process of the insulating, wear-resistant and corrosion-resistant composite coating provided by the invention, a uniform and compact high-insulating, high-wear-resistant and high-corrosion-resistant composite coating can be prepared on the surface of the titanium alloy gasket. The introduction of the nickel-based metal transition layer relieves the difference of thermal expansion coefficients between the ceramic surface layer and the titanium alloy matrix and reduces stress, wherein Ni and Cr elements improve the corrosion resistance of the coating, B, Si elements improve the wear resistance of the coating, and Mo elements improve the high-temperature mechanical property of the coating. Ceramic top layer as main functional layer, wherein Al2O3Has better insulating property and wear resistance, TiO2The addition of the (C) improves the toughness and the temperature alternation resistance of the composite coating, and ZrO2The composite coating has good high-temperature resistance, and the composite coating has comprehensive properties of high insulation, wear resistance, corrosion resistance, temperature alternation resistance and the like after being compounded by a plurality of materials. The thickness of the composite coating is 0.25-0.35 mm, and the volume resistivity is more than or equal to 1014Omega.m, the bonding strength of the composite coating and the titanium alloy gasket is 40-50 MPa, the crushing strength is more than or equal to 500MPa, and the microhardness of the composite coating is 800-1000 HV0.1. The insulating, wear-resistant and corrosion-resistant composite coating obtained by the invention is mainly used for insulating and protecting the connecting parts of the ship pipeline systems such as titanium alloy gaskets, screws and the like, can effectively isolate electric potential, avoids galvanic corrosion, improves the sealing reliability of the pipeline systems, prolongs the service life of the pipeline systems, and has important engineering application value. Compared with the existing titanium alloy gasket coating insulation protection and oxidation insulation protection technologies, the titanium alloy gasket coating insulation protection and oxidation insulation protection technology has the characteristics of high insulation performance, high strength, good wear resistance, ageing resistance and the like, and can solve the problem that the existing titanium alloy gasket is easy to cause galvanic corrosion in a marine environment.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to specific embodiments, and it should be understood that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, belong to the scope of the present invention.
A composite coating for a titanium alloy gasket is composed of a nickel-based metal transition layer with the thickness of 0.06mm and a ceramic surface layer with the thickness of 0.3-0.4 mm;
the nickel-based metal transition layer comprises the following chemical components in percentage by mass: 60-85% of Ni, 10-30% of Cr, 3-6% of B, 3-6% of Si, 2-5% of Fe and 2-5% of Mo;
the ceramic surface layer comprises the following chemical components in percentage by mass: al (Al)2O3 70~90%、TiO2 15~30%、ZrO2 3~10%。
A preparation method of a composite coating for a titanium alloy gasket mainly comprises the following steps:
s1, surface cleaning
Cleaning the surface of the titanium alloy gasket by using acetone and absolute ethyl alcohol to remove oil stains and ensure that the surface of the gasket is clean;
s2, sandblasting coarsening
Carrying out sand blasting and coarsening on the surface by adopting 16-mesh and 24-mesh mixed brown corundum sand grains with the mass ratio of 1: 1-3: 1, wherein compressed air for sand blasting is required to be dry and oilless, the air pressure is 0.6-0.8 MPa, the spraying angle is 90 +/-10 degrees, the sand blasting distance is 0.1-0.2 m, and the sand blasting is carried out until the matte fresh metal surface is exposed on the surface of the titanium alloy gasket;
s3 coating preparation
S31, fixing the titanium alloy gasket on a spraying tool, preparing a nickel-based metal transition layer on the surface of the titanium alloy gasket by adopting a supersonic flame spraying process, wherein the thickness of the nickel-based metal transition layer is 0.06mm, the fuel is propane and air, the surface of the titanium alloy gasket needs to be preheated to be more than 50 ℃ before spraying, the surface temperature of the titanium alloy gasket needs to be less than 150 ℃ during spraying, and the coating is prevented from overheating by adopting multi-pass spraying; the specific parameters of the supersonic flame spraying process are as follows: the air pressure is 0.6-0.8 MPa, the propane pressure is 0.5-0.7 MPa, the powder feeding speed is 25-50 g/min, the spraying distance is 180-220 mm, the spraying angle is 60-90 degrees, the spraying speed is 400-600 mm/s, and the spraying step distance is 2.5-3.5 mm;
s32, preparing a ceramic surface layer with the thickness of 0.3-0.4 mm on the surface of the nickel-based metal transition layer by adopting a high-speed plasma spraying process, wherein the spraying gas is argon and hydrogen, the surface of the titanium alloy gasket needs to be preheated to more than 50 ℃ before spraying, the surface temperature of the gasket needs to be less than 150 ℃ in the spraying process, and the coating is prevented from overheating by adopting multi-pass spraying; the specific parameters of the high-speed plasma spraying process are as follows: the spraying current is 680-800A, the spraying voltage is 45-60V, the main gas pressure is 0.5-0.8 MPa, the main gas flow is 50-80L/min, the auxiliary gas pressure is 0.4-0.6 MPa, the auxiliary gas flow is 4-10L/min, the carrier gas flow is 5-8L/min, the powder feeding speed is 30-60 g/min, the spraying distance is 90-110 mm, the spraying angle is 60-90 degrees, the spraying speed is 400-600 mm/s, and the spraying step distance is 2.5-3.5 mm;
s4 grinding and polishing composite coating
Fixing the titanium alloy washer on a plane grinder, grinding the surface of the titanium alloy washer, detecting the thickness of the composite coating through a nondestructive thickness gauge to ensure that the final thickness of the composite coating is 0.25-0.35 mm, and after grinding, dipping diamond grinding paste into scouring pad to polish the surface of the coating to ensure that the surface smoothness of the coating is less than or equal to 1.6 microns.
According to the invention, through the modes of surface cleaning and sand blasting coarsening, oil stains, impurities and the like on the surface of the titanium alloy gasket are removed, the binding force of the coating and the titanium alloy matrix is improved, and the surface treatment grade is required to be more than Sa2.5.
Example 1
A preparation method of a composite coating for a titanium alloy gasket mainly comprises the following steps:
s1, surface cleaning
Cleaning the surface of the titanium alloy gasket by using acetone and absolute ethyl alcohol to remove oil stains and ensure that the surface of the gasket is clean;
s2, sandblasting coarsening
Carrying out sand blasting and coarsening on the surface by adopting 16-mesh and 24-mesh mixed brown corundum sand grains with the mass ratio of 3: 1; the compressed air for sand blasting is required to be dry and oilless, the pressure is 0.7MPa, the spraying angle is 90 degrees, the sand blasting distance is 0.15m, and sand blasting is carried out until the matte fresh metal surface is exposed on the surface of the titanium alloy gasket;
s3 coating preparation
S31, the nickel-based metal transition layer is made of spherical spraying powder containing 75% of Ni, 15% of Cr and 10% of Mo, and the spraying process comprises the steps of enabling the air pressure to be 0.8MPa, enabling the propane pressure to be 0.68MPa, enabling the powder feeding speed to be 30g/min, enabling the spraying distance to be 210mm, enabling the spraying angle to be 90 degrees, enabling the spraying speed to be 600mm/S, enabling the step pitch to be 3mm, enabling the preheating temperature to be 55 ℃, enabling the highest temperature of a base body in the spraying process to be 135 ℃ and enabling the thickness of the coating to be 0.065 mm;
s32, the material for spraying the ceramic surface layer is Al-containing2O3 80%，TiO2 12%，ZrO28 percent of spherical powder, wherein the preparation process comprises spraying voltage of 58V, current of 760A, main gas pressure of 0.62MPa, main gas flow of 60L/min, auxiliary gas pressure of 0.52MPa, auxiliary gas flow of 6L/min, carrier gas flow of 5L/min, powder feeding speed of 40g/min, spraying distance of 100mm, spraying angle of 90 degrees, spraying speed of 450mm/s, step distance of 3mm and highest substrate temperature of about 140 ℃;
s4 grinding and polishing composite coating
Fixing the titanium alloy washer on a plane grinder, grinding the surface of the titanium alloy washer, detecting the thickness of the composite coating through a nondestructive thickness gauge to ensure that the final thickness of the composite coating is 0.25-0.35 mm, and after grinding, dipping diamond grinding paste into scouring pad to polish the surface of the coating to ensure that the surface smoothness of the coating is less than or equal to 1.6 microns.
The volume resistivity of the composite coating prepared in this example was about 6X 1014Omega.m, bonding strength of 45MPa, crushing strength of more than 500MPa, microhardness of about 950HV0.1。
Example 2
A preparation method of a composite coating for a titanium alloy gasket mainly comprises the following steps:
s1, surface cleaning
Cleaning the surface of the titanium alloy gasket by using acetone and absolute ethyl alcohol to remove oil stains and ensure that the surface of the gasket is clean;
s2, sandblasting coarsening
Carrying out sand blasting and coarsening on the surface by adopting 16-mesh and 24-mesh mixed brown corundum sand grains with the mass ratio of 2: 1; the compressed air for sand blasting is required to be dry and oilless, the pressure is 0.65MPa, the spraying angle is 90 degrees, the sand blasting distance is 0.1m, and sand blasting is carried out until the matte fresh metal surface is exposed on the surface of the titanium alloy gasket;
s3 coating preparation
S31, the nickel-based metal transition layer is made of spherical spraying powder containing Ni80%, Cr12% and Mo8%, and the spraying process comprises the steps of air pressure of 0.78MPa, propane pressure of 0.7MPa, powder feeding speed of 25g/min, spraying distance of 200mm, spraying angle of 90 degrees, spraying speed of 500mm/S, step pitch of 3.2mm, preheating temperature of 52 ℃, substrate highest temperature of 140 ℃ and coating thickness of 0.06 mm;
s32, the material for spraying the ceramic surface layer is Al-containing2O3 85%，TiO2 10%，ZrO25 percent of spherical powder, wherein the preparation process comprises spraying voltage of 55V, current of 760A, main gas pressure of 0.65MPa, main gas flow of 60L/min, auxiliary gas pressure of 0.54MPa, auxiliary gas flow of 6L/min, carrier gas flow of 5L/min, powder feeding speed of 35g/min, spraying distance of 100mm, spraying angle of 90 degrees, spraying speed of 500mm/s, step distance of 3mm and highest substrate temperature of about 135 ℃;
s4 grinding and polishing composite coating
Fixing the titanium alloy washer on a plane grinder, grinding the surface of the titanium alloy washer, detecting the thickness of the composite coating through a nondestructive thickness gauge to ensure that the final thickness of the composite coating is 0.25-0.35 mm, and after grinding, dipping diamond grinding paste into scouring pad to polish the surface of the coating to ensure that the surface smoothness of the coating is less than or equal to 1.6 microns.
The volume resistivity of the composite coating prepared in this example was about 6.4X 1014Omega.m, bonding strength of 43MPa, crushing strength of more than 500MPa, microhardness of 940HV0.1。
According to the composite coating for the titanium alloy gasket and the preparation method thereof, the composite optimization design of the coating components is adopted, the supersonic flame spraying and high-speed plasma spraying processes are adopted to prepare the composite coating with high electric insulation, high hardness, high bonding strength, high density, good wear resistance and good corrosion resistance on the surface of the titanium alloy gasket, and the roughness and the flatness of the surface of the coating are controlled through the grinding and polishing processing of the coating, so that the problems of galvanic corrosion, high-strength load, abrasion and the like in the service process of the titanium alloy gasket are solved, the service performance of the gasket is improved, and the running reliability of pipeline system equipment and accessories of a ship is improved.
The foregoing is merely a preferred embodiment of the invention and is not to be construed as limiting the invention in any way. All equivalent changes or modifications made according to the spirit of the present invention should be covered within the protection scope of the present invention.
Claims (4)
1. The composite coating for the titanium alloy gasket is characterized in that: the composite coating consists of a nickel-based metal transition layer with the thickness of 0.06mm and a ceramic surface layer with the thickness of 0.3-0.4 mm;
the nickel-based metal transition layer comprises the following chemical components in percentage by mass: 60-85% of Ni, 10-30% of Cr, 3-6% of B, 3-6% of Si, 2-5% of Fe and 2-5% of Mo;
the ceramic surface layer comprises the following chemical components in percentage by mass: al (Al)2O3 70~90%、TiO2 15~30%、ZrO2 3~10%。
2. A preparation method of a composite coating for a titanium alloy gasket is characterized by mainly comprising the following steps:
s1, surface cleaning
Cleaning the surface of the titanium alloy gasket by using acetone and absolute ethyl alcohol to remove oil stains and ensure that the surface of the gasket is clean;
s2, sandblasting coarsening
Carrying out sand blasting and coarsening on the surface by adopting 16-mesh and 24-mesh mixed brown corundum sand grains with the mass ratio of 1: 1-3: 1, wherein compressed air for sand blasting is required to be dry and oilless, the air pressure is 0.6-0.8 MPa, the spraying angle is 90 +/-10 degrees, the sand blasting distance is 0.1-0.2 m, and the sand blasting is carried out until the matte fresh metal surface is exposed on the surface of the titanium alloy gasket;
s3 coating preparation
S31, fixing the titanium alloy gasket on a spraying tool, preparing a nickel-based metal transition layer on the surface of the titanium alloy gasket by adopting a supersonic flame spraying process, wherein the thickness of the nickel-based metal transition layer is 0.06mm, the fuel is propane and air, the surface of the titanium alloy gasket needs to be preheated to be more than 50 ℃ before spraying, the surface temperature of the titanium alloy gasket needs to be less than 150 ℃ during spraying, and the coating is prevented from overheating by adopting multi-pass spraying;
s32, preparing a ceramic surface layer with the thickness of 0.3-0.4 mm on the surface of the nickel-based metal transition layer by adopting a high-speed plasma spraying process, wherein the spraying gas is argon and hydrogen, the surface of the titanium alloy gasket needs to be preheated to more than 50 ℃ before spraying, the surface temperature of the gasket needs to be less than 150 ℃ in the spraying process, and the coating is prevented from overheating by adopting multi-pass spraying;
s4 grinding and polishing composite coating
Fixing the titanium alloy washer on a plane grinder, grinding the surface of the titanium alloy washer, detecting the thickness of the composite coating through a nondestructive thickness gauge to ensure that the final thickness of the composite coating is 0.25-0.35 mm, and after grinding, dipping diamond grinding paste into scouring pad to polish the surface of the coating to ensure that the surface smoothness of the coating is less than or equal to 1.6 microns.
3. The method for preparing the composite coating for the titanium alloy gasket according to claim 2, wherein: in step S31, the specific process parameters for preparing the nickel-based metal transition layer on the surface of the titanium alloy washer by the supersonic flame spraying process are as follows: the air pressure is 0.6-0.8 MPa, the propane pressure is 0.5-0.7 MPa, the powder feeding speed is 25-50 g/min, the spraying distance is 180-220 mm, the spraying angle is 60-90 degrees, the spraying speed is 400-600 mm/s, and the spraying step distance is 2.5-3.5 mm.
4. The method for preparing the composite coating for the titanium alloy gasket according to claim 2, wherein: in step S32, the specific process parameters for preparing a ceramic surface layer on the surface of the nickel-based metal transition layer by using the high-speed plasma spraying process are as follows: the spraying current is 680-800A, the spraying voltage is 45-60V, the main gas pressure is 0.5-0.8 MPa, the main gas flow is 50-80L/min, the auxiliary gas pressure is 0.4-0.6 MPa, the auxiliary gas flow is 4-10L/min, the carrier gas flow is 5-8L/min, the powder feeding speed is 30-60 g/min, the spraying distance is 90-110 mm, the spraying angle is 60-90 degrees, the spraying speed is 400-600 mm/s, and the spraying step distance is 2.5-3.5 mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110910069.8A CN113755780A (en) | 2021-08-09 | 2021-08-09 | Composite coating for titanium alloy gasket and preparation method thereof |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115011907A (en) * | 2022-06-10 | 2022-09-06 | 南方电网电力科技股份有限公司 | Supersonic flame spraying composite coating and preparation method and application thereof |
| CN115044859A (en) * | 2022-06-17 | 2022-09-13 | 中国船舶重工集团公司第七二五研究所 | Titanium alloy material surface treatment method |
| CN115233142A (en) * | 2022-07-27 | 2022-10-25 | 重庆川仪调节阀有限公司 | Preparation method of corrosion-resistant and wear-resistant composite hard coating on surface of titanium alloy |
| CN115287576A (en) * | 2022-08-11 | 2022-11-04 | 中国兵器装备集团西南技术工程研究所 | Preparation method of wear-resistant corrosion-resistant insulating coating |
| CN115448705A (en) * | 2022-10-27 | 2022-12-09 | 上海能源科技发展有限公司 | Insulating and anticorrosive composite ceramic coating and preparation method and application thereof |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1364144A (en) * | 1971-11-24 | 1974-08-21 | Ramsey Corp | Face seals |
| CN104087890A (en) * | 2014-07-18 | 2014-10-08 | 郑州高端装备与信息产业技术研究院有限公司 | Method for preparing ceramic coating lining of mud pump cylinder sleeve |
| CN105861974A (en) * | 2016-04-06 | 2016-08-17 | 成都布雷德科技有限公司 | Composite coating with impact erosion and cavitation erosion abrasion resistances |
| CN106637035A (en) * | 2017-02-16 | 2017-05-10 | 中国船舶重工集团公司第七二五研究所 | Wear-resistant coating on valve plate of EB furnace equipment gate valve, and spraying technology thereof |
| CN110965005A (en) * | 2019-11-22 | 2020-04-07 | 江阴市东泰管件有限公司 | High-temperature corrosion resistant coating on surface of heating furnace radiation area collecting pipe and preparation method thereof |
| CN111593287A (en) * | 2020-05-29 | 2020-08-28 | 深圳市万泽中南研究院有限公司 | Method for forming ceramic core aluminum oxide coating by supersonic plasma spraying |
-
2021
- 2021-08-09 CN CN202110910069.8A patent/CN113755780A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1364144A (en) * | 1971-11-24 | 1974-08-21 | Ramsey Corp | Face seals |
| CN104087890A (en) * | 2014-07-18 | 2014-10-08 | 郑州高端装备与信息产业技术研究院有限公司 | Method for preparing ceramic coating lining of mud pump cylinder sleeve |
| CN105861974A (en) * | 2016-04-06 | 2016-08-17 | 成都布雷德科技有限公司 | Composite coating with impact erosion and cavitation erosion abrasion resistances |
| CN106637035A (en) * | 2017-02-16 | 2017-05-10 | 中国船舶重工集团公司第七二五研究所 | Wear-resistant coating on valve plate of EB furnace equipment gate valve, and spraying technology thereof |
| CN110965005A (en) * | 2019-11-22 | 2020-04-07 | 江阴市东泰管件有限公司 | High-temperature corrosion resistant coating on surface of heating furnace radiation area collecting pipe and preparation method thereof |
| CN111593287A (en) * | 2020-05-29 | 2020-08-28 | 深圳市万泽中南研究院有限公司 | Method for forming ceramic core aluminum oxide coating by supersonic plasma spraying |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115011907A (en) * | 2022-06-10 | 2022-09-06 | 南方电网电力科技股份有限公司 | Supersonic flame spraying composite coating and preparation method and application thereof |
| CN115011907B (en) * | 2022-06-10 | 2024-01-19 | 南方电网电力科技股份有限公司 | Supersonic flame spraying composite coating and preparation method and application thereof |
| CN115044859A (en) * | 2022-06-17 | 2022-09-13 | 中国船舶重工集团公司第七二五研究所 | Titanium alloy material surface treatment method |
| CN115233142A (en) * | 2022-07-27 | 2022-10-25 | 重庆川仪调节阀有限公司 | Preparation method of corrosion-resistant and wear-resistant composite hard coating on surface of titanium alloy |
| CN115287576A (en) * | 2022-08-11 | 2022-11-04 | 中国兵器装备集团西南技术工程研究所 | Preparation method of wear-resistant corrosion-resistant insulating coating |
| CN115448705A (en) * | 2022-10-27 | 2022-12-09 | 上海能源科技发展有限公司 | Insulating and anticorrosive composite ceramic coating and preparation method and application thereof |
| CN115448705B (en) * | 2022-10-27 | 2023-09-29 | 上海能源科技发展有限公司 | Insulating anti-corrosion composite ceramic coating and preparation method and application thereof |
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