WO2011148515A1 - 被溶射体および被溶射体の溶射方法 - Google Patents

被溶射体および被溶射体の溶射方法 Download PDF

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Publication number
WO2011148515A1
WO2011148515A1 PCT/JP2010/059163 JP2010059163W WO2011148515A1 WO 2011148515 A1 WO2011148515 A1 WO 2011148515A1 JP 2010059163 W JP2010059163 W JP 2010059163W WO 2011148515 A1 WO2011148515 A1 WO 2011148515A1
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Prior art keywords
sprayed
coating
thermal
molten metal
particles
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PCT/JP2010/059163
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English (en)
French (fr)
Japanese (ja)
Inventor
米倉伸雄
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日鉄ハード株式会社
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Application filed by 日鉄ハード株式会社 filed Critical 日鉄ハード株式会社
Priority to CN201080067010.7A priority Critical patent/CN102906298B/zh
Priority to KR1020127032451A priority patent/KR20130113941A/ko
Priority to MX2012013660A priority patent/MX2012013660A/es
Priority to BR112012029727A priority patent/BR112012029727A2/pt
Priority to PCT/JP2010/059163 priority patent/WO2011148515A1/ja
Priority to US13/697,829 priority patent/US20130101820A1/en
Priority to JP2012517081A priority patent/JPWO2011148515A1/ja
Publication of WO2011148515A1 publication Critical patent/WO2011148515A1/ja

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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
    • 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
    • C23C4/04—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
    • 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
    • C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
    • C23C2/003—Apparatus
    • C23C2/0034—Details related to elements immersed in bath
    • C23C2/00342—Moving elements, e.g. pumps or mixers
    • C23C2/00344—Means for moving substrates, e.g. immersed rollers or immersed bearings
    • 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
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/24—Structurally defined web or sheet [e.g., overall dimension, etc.]
    • Y10T428/24942—Structurally defined web or sheet [e.g., overall dimension, etc.] including components having same physical characteristic in differing degree
    • Y10T428/2495—Thickness [relative or absolute]
    • Y10T428/24967—Absolute thicknesses specified
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/25—Web or sheet containing structurally defined element or component and including a second component containing structurally defined particles
    • Y10T428/252—Glass or ceramic [i.e., fired or glazed clay, cement, etc.] [porcelain, quartz, etc.]

Definitions

  • the present invention relates to a thermal sprayed body on which thermal spray particles are sprayed and a manufacturing method of the thermal sprayed body.
  • a method for forming a film on the surface of a steel plate As a method for forming a film on the surface of a steel plate, a method in which the steel plate is immersed in a pool containing molten metal such as zinc, aluminum, zinc-aluminum alloy, or the like is known.
  • the pool is provided with a transport roll for transporting the steel plate, and the transport roll may be eroded and corroded by the molten metal. Therefore, a method of covering the surface of the transport roll with a protective film is known as a countermeasure against penetration corrosion.
  • Patent Documents 1 and 2 disclose a method of spraying a WC-Co-based or WC-B-Co-based cermet material by a high-speed gas spraying method.
  • Patent Document 3 discloses a method of subjecting a sprayed layer formed by plasma spraying ceramics such as chromia on the coating to a sealing treatment.
  • Patent Document 4 discloses a method of generating and sealing chromium carbide on the surface and pores of a sprayed layer.
  • Patent Document 5 discloses a method in which composite ceramics made of SiO 2 —Cr 2 O 3 —Al 2 O 3 is sprayed on the surface of a substrate with a plasma gun or a gas spray gun and sealed with Cr oxide.
  • Patent Document 6 states that WC in the cermet sprayed coating and Co, which is a binder, form a local battery in molten zinc and adjust the components of the binder as a measure to prevent corrosion so that the difference in immersion potential is 80 mV or less. A method is disclosed.
  • JP-A-48-11237 Japanese Patent No. 2553937 Japanese Patent Laid-Open No. 5-209259 JP-A-8-109458 JP 2002-4016 A JP 2009-19271 A
  • an object of the present invention is to provide a thermal sprayed body provided with an oxide ceramic sprayed coating having a strong bonding force between sprayed particles, a dense, low alteration, and high insulating property.
  • the thermal spraying object according to the present invention uses oxide-based ceramic sprayed particles having an average particle diameter of 10 ⁇ m or less as a median diameter, and is an oxide-based ceramic that is dense, has little alteration, and has high insulation properties.
  • the average particle diameter is a median diameter measured by a laser diffraction / scattering measurement method.
  • thermo sprayed body provided with an oxide ceramic sprayed coating having a high bonding force between sprayed particles and being dense and having little alteration and high insulating properties.
  • 4 is an optical micrograph of a coating obtained by thermally spraying oxide-based ceramics (chromia) on a WC-B-Co-based cermet high-speed gas sprayed coating according to Patent Document 3.
  • the finely sealed gray alumina sprayed particles of 6 ⁇ m are used according to the present invention, and the non-sealed coating coated by 50 ⁇ m by the high-speed gas spraying machine is 553% by weight aluminum / 873K.
  • the sprayed body of the present invention includes various members that are excellent in bonding force between sprayed particles, require a dense oxide-based ceramic sprayed coating with little alteration and high insulation.
  • Such members include a member that contacts molten metal, a transport roller that transports high temperature glass of 473K or more, and a hearth roll disposed in a heat treatment furnace for a steel plate.
  • the member in contact with the molten metal includes a transport roll for transporting the steel plate in the storage container in which the molten metal for steel plate plating is stored, a transport roll for transporting the steel plate to which the molten metal has adhered, outside the storage container, and a molten metal.
  • a thermal spray coating sprayed on a molten metal member such as a transport roll used for hot dip galvanization are as follows: (1) Erosion due to hot zinc is unlikely to occur. (2) It is hard to be worn even when it comes into contact with a plate material (steel plate), (3) It is easy to peel off and adhere to a hot-dip zinc, (4) It has a long life as a plating member and is low in cost. It is required that (5) it is well resistant to thermal shock when immersed in high-temperature molten zinc, and (6) the corrosion potential is low in the components of the cermet sprayed coating in molten zinc.
  • the thermal spray coating obtained by spraying the WC-Co-based or WC-B-Co-based cermet material of Patent Documents 1 and 2 by the high-speed gas spraying method causes the Co binder to be eroded by molten zinc and aluminum and through the through-holes and pores. These molten metals permeate and corrode the sprayed coating, and a corrosion potential is generated to peel and wear the sprayed coating. In addition, the molten metal that has penetrated into the sprayed coating is stuck in the sprayed coating, and does not easily peel off, thereby reducing the plating quality of the steel sheet.
  • the coating obtained by spraying an oxide-based ceramic on the cermet sprayed coating described in Patent Documents 3 to 5 is easily cracked and peeled off by thermal shock, and has a low coating strength and wear resistance. Bonds between ceramic spray particles.
  • the bonding structure is fragile, mechanical external force and thermal stress act to easily cause cracking and peeling and low insulation.
  • the ceramic sprayed coating has a pumice-like structure with pores and through pores of about 15% to 25%, the molten metal easily penetrates into the pores and through pores of the ceramic sprayed coating, and the molten metal and its oxide (dross) ) Is in a state of being stuck in the sprayed coating, and does not easily peel off, and deteriorates the plating quality of the steel sheet.
  • FIG. 1 is a photograph of a cross section of a conventional WC-B-Co cermet high-speed gas sprayed coating immersed in a molten metal of 873K 55 wt% aluminum / 45 wt% zinc for 16 days with an optical microscope.
  • Zinc and aluminum which are molten metal components, permeate into the sprayed coating, cracks appear in the sprayed coating, and are on the verge of peeling.
  • Co which is a binder of the thermal spray coating, is corroded and penetrated into the molten metal, and the molten metal is penetrated and corroded through the through-holes and pores.
  • FIG. 2 is a photograph of a cross section of a coating obtained by spraying oxide ceramics (chromia) on a WC-B-Co cermet high-speed gas sprayed coating according to Patent Document 3, taken with an optical microscope. Ceramics are usually sprayed using a plasma gun because of their high melting point. Since the temperature of the plasma of the plasma gun is about 30,000 K, the sprayed particles completely melt and form droplets and collide with the substrate, but the sprayed particle velocity is about 250 m / sec. There are 15% to 25% pores in them.
  • the bonding force between the sprayed particles is low, and the sealing material is connected between the sprayed particles, but all the pores cannot be filled, and the oxide ceramic itself does not react with the molten metal, but the molten metal gets stuck in the pores. This prevents the molten metal from peeling off. Further, the sealing agent is cracked or peeled off due to mechanical external force or thermal stress due to contact with the steel plate, and the molten metal further penetrates the sealing agent, making it difficult to peel off the molten metal.
  • plasma-sprayed oxide-based ceramic particles are rapidly cooled from the state of the droplets, and therefore there are many micro cracks that weaken the mechanical strength and reduce the insulation.
  • the present inventors can realize an oxide-based ceramic sprayed coating that is dense, has high interparticle bonding strength, and is less altered and highly insulating, it will have good zinc peelability, prevent the generation of corrosion potential, and prevent acid penetration. It has been found that a long-life molten metal member having wear resistance and molten metal corrosion that can withstand repeated pickling can be obtained.
  • the thermal sprayed coating used for molten metal members receives a large thermal shock when in contact with the molten metal.
  • a ceramic sprayed material having inferior toughness compared to metal and cermet sprayed materials has been used to relieve thermal stress by thermal deformation as a structure by increasing pores and forming a pumice-like structure.
  • the plasma gun plasma temperature is about 30,000 K
  • the sprayed particles completely melt and form droplets and collide with the substrate, but the sprayed particle velocity is as low as about 250 m / sec. Therefore, there are necessarily 15% to 25% pores in the sprayed coating.
  • the ceramic once the ceramic is melted and sprayed, it undergoes a phase change and changes its quality, and becomes similar to the original ceramic as a bulk body.
  • the present inventor is a thermal sprayed material having a thermal spray coating having a thermal spray coating sprayed with an oxide-based ceramic thermal spray particle having an average particle diameter of 10 ⁇ m or less as a median diameter, and the thermal spray particles in the thermal spray coating are:
  • the present inventors have found a thermal sprayed body that comes into contact with a molten metal formed from a surface layer portion that is once melted by heat and solidified, and an inner layer portion that is not thermally melted during thermal spraying.
  • FIG. 4 is a sectional view of the high-speed gas spraying apparatus.
  • the thermal spray coating is sprayed by a high-speed gas spraying apparatus shown in FIG.
  • Kerosene or kerosene which is a fuel filled in the combustion chamber 2
  • the combustion chamber has a high pressure of about 0.7 MPa.
  • the combustion gas is generated into a high-temperature supersonic gas of about 3270 K and 3000 m / sec by a Laval nozzle 3 installed at the outlet of the combustion chamber.
  • spray particles blown from the spray particle blowing nozzle 4 are supplied.
  • the supplied sprayed particles are heated and accelerated, and sprayed onto the sprayed material.
  • This high-speed gas sprayer is roughly divided into a combustion chamber tail plug 1 disposed at the rear end, a combustion chamber 2 in front of the spraying direction, and a spray nozzle 5 connected to the combustion chamber 2.
  • the fuel chamber tail plug 1 is provided with a fuel supply hole 7 for supplying fuel such as kerosene or kerosene at a high speed forward in the spraying direction and an oxygen supply hole 8 for supplying oxygen gas at a high speed forward in the spraying direction.
  • the combustion chamber 2 to which the combustion chamber tail plug 1 is attached is formed in a cylindrical shape, and a laval type nozzle 3 having a shape that gradually expands after the diameter is reduced to a small diameter is connected to the spray nozzle 5. Is formed.
  • the thermal spray nozzle 5 connected to the combustion chamber 2 via the Laval nozzle 3 is a copper tube having an inner diameter of about 11 mm and a length of about 10 cm to 20 cm, and is water-cooled from the outside.
  • a thermal spray material supply unit 4 for supplying the thermal spray material is disposed on the Laval nozzle 3 side of the thermal spray nozzle 5.
  • the thermal spray material a material obtained by adding a material in accordance with required properties such as wear resistance to a Ni-based, Ni-Cr-based or Co-based alloy is used.
  • kerosene or kerosene supply holes 7 and oxygen supply holes 8 installed in the combustion chamber tail plug 1 are burned in the combustion chamber 2.
  • the combustion gas in the combustion chamber 2 at this time has a pressure of about 0.7 MPa and a combustion temperature of about 3000 ° C.
  • the combustion gas is fed into the Laval nozzle, and when passing through the Laval nozzle 3, it is accelerated from the sonic speed to the supersonic speed and supplied to the thermal spray nozzle 5.
  • a thermal spray material is blown from the thermal spray material supply part 4 with respect to the accelerated combustion gas. The thermal spray material is accelerated and heated by the combustion gas.
  • the combustion gas and the thermal spray material are rectified by passing through the thermal spray nozzle 5, and are focused from the tip of the thermal spray nozzle 5 with improved convergence. Thereby, the thermal spray material can be sprayed at a very high speed and sprayed onto the thermal spray material.
  • white alumina which is an oxide-based ceramic having an average particle diameter of 40 ⁇ m as a median diameter, normally used in the thermal spraying apparatus of FIG. 4, but no film was formed.
  • the surface temperature of the spray particles in flight was 2053 K and the spray particle velocity was 815 m / sec as measured using an Accuspray spray measurement device manufactured by Sulzer Metco.
  • the melting point of white alumina was 2302K, and it was found that no film was formed due to insufficient temperature and speed.
  • the surface area is proportional to the square of the diameter, and the volume is proportional to the cube of the diameter. Accordingly, the specific surface area increases in inverse proportion to the diameter. For example, when the spray particle diameter is reduced from 40 ⁇ m to 4 ⁇ m, the specific surface area increases 10 times. The weight is 1/1000. Since the spray particles blown into the combustion gas are heated from the surface and are sprayed on the flow of the combustion gas, it is predicted that if the spray particles are made finer, the temperature and speed of the spray particles increase.
  • a white alumina particle having an average particle diameter of 4 ⁇ m as a median diameter was blown in and measured using an Accuspray spray measurement device manufactured by Sulzer Metco.
  • the spray particle surface temperature during flight was 2700 K, and the spray particle velocity was 2750 m / sec. It was. This exceeded the melting point 2302K of white alumina.
  • a film of 6 ⁇ m was formed per pass.
  • the ⁇ phase which is a bulk material of white alumina, remains as it is, and the ⁇ phase generated when melted is a very small part. It was confirmed that it was very close.
  • the surface temperature of the sprayed particles in flight was 2400K and the sprayed particle velocity was 1000 m / sec when white alumina particles with a median diameter of 10 ⁇ m were blown and measured using an Accuspray spray measuring device manufactured by Sulzer Metco. It was. This exceeded the melting point 2302K of white alumina, and when actually sprayed, a film of 1 ⁇ m was formed per pass.
  • oxide-based ceramic sprayed particles with an average particle diameter of 10 ⁇ m or less as the median diameter, the sprayed particles are sprayed at a high-speed flying particle speed of 1000 m / second or more while the surface is in a semi-molten state and the inside is in a solid state.
  • spraying of oxide-based ceramics which has not been conventionally formed, can be performed with a high-speed gas spraying apparatus.
  • FIG. 5 is an example of the high-speed gas spraying apparatus disclosed in Japanese Patent Application Laid-Open No. 2009-179846 by the present inventor, and is installed at the tip of the high-speed gas spraying apparatus 1.
  • the inner diameter of the inner cylinder 2 is the same as the inner diameter of the nozzle of the high-speed gas spraying apparatus.
  • Air, nitrogen gas or the like blown from the gas blow hole 4 forms a blown cylindrical gas tunnel from the cylindrical gap with the outer tube 3 to prevent the sprayed particles from being oxidized. On the other hand, it may not be used when thermal spraying oxide-based ceramics.
  • the finely sprayed particles are blown at the tip portion at the inside and center of the combustion gas 6 at a higher temperature and at a higher speed than the sprayed powder blowing portion 5 and become high temperature and high speed.
  • nozzle spraying and spitting did not occur and stable spraying was possible.
  • the oxide-based ceramic spray particles blown into the high-speed gas spraying device with a fine powder having an average particle diameter of 10 ⁇ m or less as the median diameter are heated and accelerated to a surface temperature and speed close to the combustion gas of the high-speed gas spraying device. Since physical ceramics have a low heat transfer coefficient, and the distance from the sprayer to the sprayed material (200 mm in this test example) is short and the heating time is short, the oxide ceramic spray particles in flight are only on the surface. In the semi-molten state, the inside remains in a solid state and collides with the material to be sprayed at a supersonic speed of 1000 m / second or more.
  • an insulating sprayed coating is formed that is dense and has a high interparticle bonding force and very little deterioration.
  • a high compressive residual stress remains in the sprayed coating, it exhibits high interparticle bonding force, mechanical external force, resistance to cracking due to thermal shock, and resistance to peeling.
  • the sprayed particles that collided with the material to be sprayed include a surface layer portion that has been solidified after the sprayed particles are once melted, and an inner layer portion that is in a state before being put into the high-speed gas spraying apparatus without being thermally melted.
  • FIG. 3 shows an 873K non-sealing coating formed by spraying 50 ⁇ m with a high-speed gas sprayer using 6 ⁇ m fine gray alumina sprayed particles on a Mo—Co, Cr—B cermet sprayed coating sprayed with a high-speed gas spraying device.
  • the finely divided gray alumina sprayed coating layer was dense and no adhesion of molten metal was observed.
  • the fine grey-alumina layer on the surface protected the lower cermet sprayed coating, and the cermet sprayed coating was quite sound.
  • the test piece was immersed in sulfuric acid for 12 hours to conduct an acid resistance test.
  • the fine powdery gray alumina coating on the surface and the cermet spray coating on the lower layer were completely healthy and exhibited excellent properties as a molten metal member.
  • oxide-based ceramic sprayed coatings for molten metals that are subjected to thermal shock they are dense without forming a pumice-like multi-porosity structure. It became clear that it could be put to practical use by using a ceramic spray coating.
  • a thermal spray object having an excellent thermal shock resistance having a thermal spray coating sprayed with oxide-based ceramic thermal spray particles having an average particle diameter of 10 ⁇ m or less as a median diameter, wherein the thermal spray particles in the thermal spray coating are temporarily It is formed from a surface layer portion that is solidified after being thermally melted and an inner layer portion that is not thermally melted during thermal spraying.
  • Oxide ceramics are stable because they are oxides, and have excellent characteristics such as wear resistance, corrosion resistance at high temperatures, corrosion resistance to acids, heat insulation, and insulation, and are used in reducing atmospheres.
  • the present invention is not limited to molten metal containing Zn and / or Al, and can be used with high temperature glass of 473 K or higher.
  • the thickness of the oxide ceramic film is 50 ⁇ m or less.
  • Conventional spray particles have an average particle diameter of about 40 ⁇ m as a median diameter. Therefore, in order to prevent through pores reaching the base material, a film thickness of 200 ⁇ m is required, which is 5 times the minimum particle diameter.
  • a dense and highly insulating film having an average particle diameter of 10 ⁇ m or less according to the present invention exhibits its performance even when the sprayed thickness is 50 ⁇ m or less, resulting in a significant cost reduction.
  • the base sprayed coating made of a cermet or metal sprayed coating is used as the base spraying of the oxide ceramic sprayed coating, and the film thickness of the base sprayed coating is 200 ⁇ m. It is preferable to set as follows. Table 1 shows the thermal expansion coefficients of various materials. In general, if the difference in thermal expansion coefficient is up to about 60% in a molten zinc bath, cracks do not occur due to the difference in thermal expansion. Cheap. Oxide ceramics used for the upper layer generally have a small coefficient of thermal expansion, while stainless steel used as a base material has a large coefficient of thermal expansion. Therefore, cracking due to a difference in thermal expansion can be prevented by performing base spraying between the base material and the upper layer so that the thermal expansion coefficient is intermediate between the two.
  • the base material is SUS316L made of austenitic stainless steel
  • gray alumina or white alumina can be used as the spray particles.
  • the spray particles in the thermal spray coating are the ⁇ phase in which the crystal structure of the surface layer portion is changed from the ⁇ phase by heat melting, and the crystal structure of the inner layer portion remains the ⁇ phase.
  • gray alumina is manufactured by melting and reducing natural bauxite directly in an arc electric furnace, so it is inexpensive, has a low melting point, and is easy to spray. Also, it has good impact resistance, wear resistance, molten metal resistance, acid resistance, and molten metal peelability. As shown in the optical micrograph of FIG. 3, it is in a molten metal of 873K 55 wt% aluminum / 45 wt% zinc. It was not damaged when immersed for 16 days.
  • a conventional test specimen 1 in which a gray alumina particle having a median diameter of 25 ⁇ m and a mean particle diameter of 25 ⁇ m is sprayed with a plasma gun and a gray alumina particle having an average particle diameter of 6 ⁇ m and a median diameter of the present application are used.
  • the test pieces 2 sprayed by the high-speed gas spraying apparatus of FIG. 5 were compared in the bonding force between the sprayed particles in the sprayed coating. 1 kg of # 70 alumina blast material was sprayed at an angle of 60 ° and a distance of 65 mm, and the weight loss of the thermal spray coating was measured and compared.
  • the test piece 2 of the present invention was found to have a 5.6 times higher interparticle bonding force than the conventional sprayed coating test piece 1. It is estimated that the test piece 1 has 21% pores and is not physically bonded, and the sprayed particles are completely dissolved by the plasma of about 30,000 K, so that the alteration is also contributed, and is weak. It is a sprayed coating.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
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  • Coating By Spraying Or Casting (AREA)
  • Other Surface Treatments For Metallic Materials (AREA)
PCT/JP2010/059163 2010-05-24 2010-05-24 被溶射体および被溶射体の溶射方法 WO2011148515A1 (ja)

Priority Applications (7)

Application Number Priority Date Filing Date Title
CN201080067010.7A CN102906298B (zh) 2010-05-24 2010-05-24 热喷涂件以及热喷涂件的热喷涂方法
KR1020127032451A KR20130113941A (ko) 2010-05-24 2010-05-24 피용사체 및 피용사체의 용사 방법
MX2012013660A MX2012013660A (es) 2010-05-24 2010-05-24 Miembro revestido por pulverizacion termica y metodo de pulverizacion termica del mismo.
BR112012029727A BR112012029727A2 (pt) 2010-05-24 2010-05-24 membro para revestimento por pulverização térmica
PCT/JP2010/059163 WO2011148515A1 (ja) 2010-05-24 2010-05-24 被溶射体および被溶射体の溶射方法
US13/697,829 US20130101820A1 (en) 2010-05-24 2010-05-24 Thermal spray coated member and thermal spraying method therefor
JP2012517081A JPWO2011148515A1 (ja) 2010-05-24 2010-05-24 被溶射体および被溶射体の溶射方法

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Application Number Priority Date Filing Date Title
PCT/JP2010/059163 WO2011148515A1 (ja) 2010-05-24 2010-05-24 被溶射体および被溶射体の溶射方法

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WO2011148515A1 true WO2011148515A1 (ja) 2011-12-01

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US (1) US20130101820A1 (zh)
JP (1) JPWO2011148515A1 (zh)
KR (1) KR20130113941A (zh)
CN (1) CN102906298B (zh)
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