WO2018012454A1 - サスペンションプラズマ溶射用スラリー、希土類酸フッ化物溶射膜の形成方法及び溶射部材 - Google Patents
サスペンションプラズマ溶射用スラリー、希土類酸フッ化物溶射膜の形成方法及び溶射部材 Download PDFInfo
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01F—COMPOUNDS OF THE METALS BERYLLIUM, MAGNESIUM, ALUMINIUM, CALCIUM, STRONTIUM, BARIUM, RADIUM, THORIUM, OR OF THE RARE-EARTH METALS
- C01F17/00—Compounds of rare earth metals
- C01F17/20—Compounds containing only rare earth metals as the metal element
- C01F17/253—Halides
- C01F17/259—Oxyhalides
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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
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01F—COMPOUNDS OF THE METALS BERYLLIUM, MAGNESIUM, ALUMINIUM, CALCIUM, STRONTIUM, BARIUM, RADIUM, THORIUM, OR OF THE RARE-EARTH METALS
- C01F17/00—Compounds of rare earth metals
- C01F17/20—Compounds containing only rare earth metals as the metal element
- C01F17/206—Compounds containing only rare earth metals as the metal element oxide or hydroxide being the only anion
- C01F17/218—Yttrium oxides or hydroxides
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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
- C23C4/04—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
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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
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01F—COMPOUNDS OF THE METALS BERYLLIUM, MAGNESIUM, ALUMINIUM, CALCIUM, STRONTIUM, BARIUM, RADIUM, THORIUM, OR OF THE RARE-EARTH METALS
- C01F17/00—Compounds of rare earth metals
- C01F17/20—Compounds containing only rare earth metals as the metal element
- C01F17/253—Halides
- C01F17/265—Fluorides
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- C01P2002/00—Crystal-structural characteristics
- C01P2002/70—Crystal-structural characteristics defined by measured X-ray, neutron or electron diffraction data
- C01P2002/74—Crystal-structural characteristics defined by measured X-ray, neutron or electron diffraction data by peak-intensities or a ratio thereof only
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- C01P2004/00—Particle morphology
- C01P2004/51—Particles with a specific particle size distribution
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- C01P2004/00—Particle morphology
- C01P2004/60—Particles characterised by their size
- C01P2004/61—Micrometer sized, i.e. from 1-100 micrometer
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- C01P2006/00—Physical properties of inorganic compounds
- C01P2006/12—Surface area
Definitions
- the present invention relates to a thermal spray member suitable as a member exposed to a halogen-based gas plasma atmosphere in an etching process or the like in semiconductor manufacturing, a slurry for suspension plasma spraying used in the manufacturing, and a rare earth oxyfluoride thermal spray using the slurry.
- the present invention relates to a film forming method.
- an etching process is performed in a halogen gas plasma atmosphere having high corrosivity.
- ceramics such as metallic aluminum or aluminum oxide, yttrium oxide (Patent Document 1: JP 2002-080954 A, Patent Document 2: JP 2007-308794 A) or yttrium fluoride (Patent Document 3: Special)
- yttrium oxide Patent Document 1: JP 2002-080954 A
- Patent Document 2 JP 2007-308794 A
- yttrium fluoride Patent Document 3: Special
- Such a thermal spray member is employed in a portion of the etching apparatus (etcher) that comes into contact with the halogen-based gas plasma.
- Halogen-based corrosive gases used in the manufacturing process of semiconductor products include SF 6 , CF 4 , CHF 3 , ClF 3 , HF and the like as fluorine-based gases, and Cl 2 and BCl 3 as chlorine-based gases. HCl or the like is used.
- An yttrium oxide film-forming member produced by plasma spraying yttrium oxide has few technical problems and has been put to practical use as a thermal spray member for semiconductors from an early stage.
- the yttrium oxide film forming member has a problem in that the yttrium oxide on the outermost surface reacts with fluoride in the early stage of the etching process, and the concentration of fluorine gas in the etching apparatus changes, so that the etching process is not stable. is there. This problem is called process shift.
- yttrium fluoride tends to have a slightly lower corrosion resistance in a halogen-based gas plasma atmosphere than yttrium oxide. Further, the yttrium fluoride sprayed film has a problem that the surface has many cracks and more particles are generated than the yttrium oxide sprayed film.
- Patent Document 5 Japanese Patent Application Laid-Open No. 2014-009361.
- fluorine decreases due to oxidation, oxygen increases, composition shifts, and yttrium oxide is generated. It is difficult to form a stable film as yttrium oxyfluoride.
- suspension plasma spraying has been developed as a film forming technique that replaces plasma spraying (hereinafter simply referred to as plasma spraying) in which a thermal spray material is supplied as a solid.
- Suspension plasma spraying is a method of supplying a thermal spray material as a slurry, and has a feature that a thermal sprayed film with less surface cracks can be formed as compared with plasma spraying.
- Application of a thermal spray member by suspension plasma spraying to a member in contact with a halogen-based gas plasma of an etching apparatus for semiconductor manufacturing or a CVD apparatus has been studied.
- suspension plasma spraying using a slurry material of yttrium oxide (Patent Document 6: JP 2010-150617 A) or a slurry material of yttrium oxyfluoride (Patent Document 7: International Publication No. 2015/019673) has been proposed. Yes. However, even when a slurry material of yttrium oxyfluoride is used, even with suspension plasma spraying, it is difficult to stably form a sprayed film as yttrium oxyfluoride as in plasma spraying.
- the present invention has been made in view of the above circumstances, and in order to obtain a rare earth oxyfluoride sprayed film with less process shift and particle generation compared to an yttrium oxide sprayed film or a yttrium fluoride sprayed film, a suspension plasma is obtained.
- Slurry for suspension plasma spraying capable of stably forming a rare earth oxyfluoride sprayed film by thermal spraying, a method for forming a rare earth oxyfluoride sprayed film using the slurry, and thermal spraying suitably manufactured by suspension plasma spraying using the slurry
- An object is to provide a member.
- the inventors of the present invention contain rare earth fluoride particles having a maximum particle diameter (D100) of 12 ⁇ m or less in an amount of 5% by mass to 40% by mass, and water and an organic solvent.
- D100 maximum particle diameter
- the inventors of the present invention contain rare earth fluoride particles having a maximum particle diameter (D100) of 12 ⁇ m or less in an amount of 5% by mass to 40% by mass, and water and an organic solvent.
- the present invention provides the following slurry for slurry plasma spraying, a method for forming a rare earth oxyfluoride sprayed film, and a sprayed member.
- a slurry for suspension plasma spraying characterized by using one or more selected from water and an organic solvent as a solvent.
- the suspension plasma spraying slurry according to [1] further containing 3% by mass or less of an anti-aggregation agent composed of an organic compound.
- the rare earth element is one or more selected from yttrium (Y), gadolinium (Gd), holmium (Ho), erbium (Er), ytterbium (Yb), and lutetium (Lu).
- the slurry for suspension plasma spraying according to any one of [1] to [3].
- [6] including a step of forming a sprayed coating on the base material by suspension plasma spraying in an atmosphere containing a gas containing oxygen using the slurry according to any one of [1] to [4] as a spraying material.
- a method for forming a rare earth oxyfluoride sprayed film [7] The forming method according to [6], wherein the suspension plasma spraying is atmospheric suspension plasma spraying. [8] The method according to [6] or [7], wherein the sprayed film contains a rare earth oxyfluoride as a main phase.
- the rare earth acid fluoride is one or more selected from ReOF, Re 5 O 4 F 7 , Re 6 O 5 F 8 and Re 7 O 6 F 9 (Re represents a rare earth element).
- a thermal spray member comprising: a base material on which a thermal spray film is formed; and a thermal spray film including a rare earth oxyfluoride as a main phase.
- the rare earth element is one or more selected from yttrium (Y), gadolinium (Gd), holmium (Ho), erbium (Er), ytterbium (Yb), and lutetium (Lu).
- the rare earth acid fluoride is one or more selected from ReOF, Re 5 O 4 F 7 , Re 6 O 5 F 8 and Re 7 O 6 F 9 (Re represents a rare earth element).
- a suspension plasma is formed on a substrate by spraying a sprayed film containing rare earth oxyfluoride with less process shift and particle generation in an atmosphere containing oxygen-containing gas. It can be stably formed by thermal spraying.
- the thermal spray member provided with this thermal spray film is excellent in corrosion resistance against halogen-based gas plasma.
- the slurry of the present invention is suitably used for suspension plasma spraying in an atmosphere containing an oxygen-containing gas, in particular, air suspension plasma spraying for forming plasma in an air atmosphere.
- an atmosphere containing an oxygen-containing gas in particular, air suspension plasma spraying for forming plasma in an air atmosphere.
- the case where the ambient atmospheric gas in which plasma is formed is the atmosphere is called atmospheric suspension plasma spraying.
- the pressure at which the plasma is formed may be under normal pressure such as atmospheric pressure, under pressure, or under reduced pressure.
- the slurry for suspension plasma spraying of the present invention stably stabilizes a sprayed film containing a rare earth acid fluoride, particularly a sprayed film containing a rare earth acid fluoride as a main phase, by suspension plasma spraying in an atmosphere containing an oxygen-containing gas. Can be formed.
- rare earth fluoride is plasma sprayed in an air atmosphere, the oxygen concentration (oxygen content) of the sprayed film increases while the fluorine concentration (fluorine content) decreases.
- a sprayed film containing rare earth oxyfluoride can be formed from rare earth fluoride, but when the degree of oxidation is too low, the characteristics of rare earth fluoride are On the other hand, if the degree of oxidation is too high, the characteristics of the rare earth oxide will be superior.
- the slurry supplied in suspension plasma spraying is a rare earth having a maximum particle size (D100 (volume basis)) of 12 ⁇ m or less.
- a slurry in which fluoride particles are dispersed in a solvent is prepared.
- particles having an average particle diameter (D50) of 20 to 50 ⁇ m are supplied to a plasma flame to melt the particles to form a sprayed film.
- D50 average particle diameter
- rare earth fluoride particles having a maximum particle size (D100) of 12 ⁇ m or less are used in consideration of the above-described oxidation in the air atmosphere.
- a rare earth fluoride particle having a relatively small particle size is used as a slurry containing one or more kinds selected from water and an organic solvent as a dispersion medium, in an atmosphere containing an oxygen-containing gas, particularly in an atmospheric atmosphere.
- the degree of oxidation by suspension plasma spraying at Raw material rare earth fluoride base (hereinafter, referred to as a fine particle additive, etc.) that forms a sprayed film together with the raw material rare earth fluoride without burning or volatilizing by passing the plasma
- the raw material rare earth fluoride base), oxygen content is 1 mass% (+1 point) or more, especially 2 mass% (+2 points) or more, 5 mass% (+5 points) ) Or less, particularly 4 wt% (+ 4 points) or less, especially 3% by weight of (+ 3 points) increased sprayed film hereinafter, it can be controlled with good formation.
- the solvent water contributes to the oxidation of fluoride.
- the oxygen content of the rare earth fluoride particles in the slurry is 2% by mass
- the oxygen content of the sprayed film is The oxygen content of the raw material rare earth fluoride can be 3% by mass or more, particularly 4% by mass or more, 7% by mass or less, particularly 6% by mass or less, and particularly 5% by mass or less.
- the sprayed film has an oxygen content of 1% by mass or more, particularly 2% in terms of oxygen content based on the raw material rare earth fluoride.
- the content may be 5% by mass or more, 5% by mass or less, particularly 4% by mass or less, and particularly 3% by mass or less.
- the organic solvent has a lower proportion of oxygen in the constituent elements than water, so the degree of oxidation is low.
- the oxygen content of the rare earth fluoride particles in the slurry is 0.00. If it is 5% by mass, the oxygen content of the sprayed film is 0.1% by mass or more, particularly 0.3% by mass or more and 3% by mass or less, particularly 2% by mass, based on the raw material rare earth fluoride base. In particular, it can be 1% by mass or less.
- the fluorine content of the sprayed film is usually 31.6% by mass or more, particularly 33.5% by mass when the raw material rare earth fluoride is yttrium fluoride and the slurry does not contain the fine particle additive described later. Above, it is 38 mass% or less, especially 37 mass% or less, and especially 35 mass% or less.
- the maximum particle diameter (D100) of the rare earth fluoride particles contained in the slurry of the present invention is preferably 10 ⁇ m or less, particularly preferably 8 ⁇ m or less.
- the lower limit of the maximum particle size (D100) is usually 6 ⁇ m or more.
- the average particle diameter (D50 (volume basis)) of the rare earth fluoride particles is preferably 1 ⁇ m or more and 5 ⁇ m or less, particularly 3 ⁇ m or less.
- the average particle diameter (D50) of the rare earth fluoride particles be 1 ⁇ m or more and 3 ⁇ m or less.
- the specific surface area (BET surface area) of the rare earth fluoride particles is preferably 5 m 2 / g or less, particularly 3 m 2 / g or less, particularly 2 m 2 / g or less.
- the lower limit of the specific surface area (BET surface area) of the rare earth fluoride particles is not particularly limited, but is usually 0.5 m 2 / g or more, preferably 1 m 2 / g or more, more preferably 1.5 m 2 / g. That's it.
- the rare earth fluoride those produced by a conventionally known method can be used.
- a rare earth oxide powder and an acidic ammonium fluoride powder equivalent to 1.1 times or more of the rare earth oxide are mixed. And it can manufacture by baking at 300 degreeC or more and 800 degrees C or less for 1 hour or more and 10 hours or less in atmosphere without oxygen, such as nitrogen gas atmosphere.
- the rare earth fluoride may be a commercial product. These can be used as particles having a predetermined particle size by pulverization with a jet mill or the like, classification with air classification or the like, if necessary.
- the rare earth fluoride that is a raw material is allowed to contain oxygen if it is in a small amount.
- a part of the rare earth fluoride may be present as a rare earth oxide or a rare earth oxyfluoride, but most of the raw material rare earth fluoride used in the present invention, for example, 90% by mass or more, preferably 95% by mass or more, more preferably 98% by mass or more, and still more preferably 99% by mass or more is composed of rare earth trifluoride. This is different from the case of using a compound.
- Substantially all of the raw material rare earth fluoride may be composed of rare earth trifluoride.
- the oxygen content of the rare earth fluoride can be 10% by mass or less, particularly 5% by mass or less, but the oxygen content of the rare earth fluoride is preferably 2% by mass or less, particularly 1% by mass. % Or less is preferable, and oxygen may not be substantially contained (for example, the oxygen content is 0.1% by mass or less).
- the concentration of rare earth fluoride particles in the slurry is 5% by mass or more and 40% by mass or less. This concentration is preferably 20% by mass or more, and more preferably 30% by mass or less. If the concentration of the rare earth fluoride particles in the slurry is less than 5% by mass, the spraying efficiency is low, and the oxidation of the rare earth fluoride in the plasma proceeds excessively, which is not preferable. On the other hand, if it exceeds 40 mass%, droplets cannot be stably formed in the plasma, and oxidation of the rare earth fluoride in the plasma is insufficient, which is not preferable.
- the solvent which is another essential component constituting the slurry one or more selected from water and organic solvents are used.
- water may be used alone, mixed with an organic solvent, or used alone.
- an aqueous slurry is preferable, and when it is desired to suppress an increase in the oxygen content of the sprayed film, an organic solvent A slurry is preferred.
- the organic solvent is preferably selected in consideration of harmfulness and influence on the environment, and examples thereof include alcohols, ethers, esters and ketones.
- monohydric or dihydric alcohol having 2 to 6 carbon atoms ether having 3 to 8 carbon atoms such as ethyl cellosolve, and glycol having 4 to 8 carbon atoms such as dimethyldiglycol (DMDG).
- DMDG dimethyldiglycol
- glycol esters having 4 to 8 carbon atoms such as ether, ethyl cellosolve acetate and butyl cellosolve acetate
- cyclic ketones having 6 to 9 carbon atoms such as isophorone.
- the organic solvent is particularly preferably a water-soluble organic solvent that can be mixed with water from the viewpoint of combustibility and safety.
- the solvent is water
- the amount of heat is lost to the evaporation of water, and droplets may not be formed.
- the solvent is an organic solvent
- the amount of heat is compensated for by combustion. Can do. Therefore, when the plasma applied power during spraying (spraying power) is high, for example, 100 kW or more, it is advantageous to use only water from the viewpoint of safety, and when the spraying power is low, for example, less than 100 kW, particularly less than 50 kW. In this case, it is advantageous to use only an organic solvent from the above viewpoint.
- the spraying power is 50 kW or more and less than 100 kW, a mixture of water and an organic solvent may be used.
- the slurry of the present invention may contain an aggregation inhibitor composed of an organic compound, particularly a water-soluble organic compound, in order to prevent aggregation of rare earth fluoride particles.
- an aggregation inhibitor composed of an organic compound, particularly a water-soluble organic compound, in order to prevent aggregation of rare earth fluoride particles.
- a surfactant or the like is suitable. Since the rare earth fluoride is charged with a zeta potential of +, an anionic surfactant is preferable, and in particular, a polyethyleneimine anionic surfactant, a polycarboxylic acid type polymer anionic surfactant, or the like is used. Is preferred.
- the solvent contains water, an anionic surfactant is preferred, but when the solvent is only an organic solvent, a nonionic surfactant can also be used.
- the concentration of the aggregation inhibitor in the slurry is 3% by mass or less, particularly preferably 1% by mass or less, more preferably 0.01% by mass or
- the slurry of the present invention may contain one or more fine particle additives selected from rare earth oxides, rare earth hydroxides and rare earth carbonates.
- the average particle diameter (D50 (volume basis)) of the fine particle additive is preferably 1/10 or less of the average particle diameter (D50 (volume basis)) of the rare earth fluoride particles.
- the concentration of the fine particle additive in the slurry is preferably 5% by mass or less, particularly preferably 4% by mass or less, more preferably 0.1% by mass or more, and particularly preferably 2% by mass or more.
- the slurry can be produced by mixing a predetermined amount of rare earth fluoride, a solvent, and, if necessary, other components such as an aggregation inhibitor and a fine particle additive.
- a resin ball mill and a resin ball for example, 10 mm ⁇ or more
- the mixing time can be, for example, 1 hour or more and 6 hours or less.
- a thermal spray member applied to a member for a semiconductor manufacturing apparatus is manufactured by forming a thermal spray film on a base material by suspension plasma spraying in an atmosphere containing a gas containing oxygen using the above-described slurry as a thermal spray material.
- a rare earth oxyfluoride sprayed film can be formed on the substrate.
- the base material is selected from stainless steel, aluminum, nickel, chromium, zinc and alloys thereof, alumina, aluminum nitride, silicon nitride, silicon carbide, and quartz glass, and is used for thermal spray members, for example, thermal spraying for semiconductor manufacturing equipment.
- a suitable substrate is selected as the member.
- the atmosphere of thermal spraying that is, the atmosphere surrounding the plasma is an atmosphere containing a gas containing oxygen because it is necessary to oxidize the rare earth fluoride.
- the atmosphere containing a gas containing oxygen include an oxygen gas atmosphere, a mixed gas atmosphere of oxygen gas and a rare gas such as argon gas and / or nitrogen gas, and typically an air atmosphere.
- the air atmosphere may be a mixed gas atmosphere of air and a rare gas such as argon gas and / or nitrogen gas.
- the plasma gas for forming plasma is preferably a mixed gas in which at least two kinds selected from argon gas, hydrogen gas, helium gas, and nitrogen gas are combined, and in particular, two kinds of argon gas and nitrogen gas are used. 3 types of mixed gas, argon gas, hydrogen gas and nitrogen gas, or 4 types of mixed gas of argon gas, hydrogen gas, helium gas and nitrogen gas are suitable.
- a slurry supply device is filled with a slurry containing rare earth fluoride particles, and a plasma spray gun tip is formed by a carrier gas (usually argon gas) using a pipe (powder hose).
- a slurry containing rare earth fluoride particles is supplied.
- the piping preferably has an inner diameter of 2 to 6 mm ⁇ .
- the slurry is sprayed in droplets from the plasma spray gun into the plasma flame, and powder, that is, rare earth fluoride particles are continuously supplied, so that the rare earth fluoride is melted and liquefied, and the liquid flame is formed by the power of the plasma jet.
- the solvent evaporates in the plasma flame. Therefore, by using the slurry of the present invention, fine particles that could not be obtained by plasma spraying in which the sprayed material is supplied as a solid can be melted and coarse. Since there are no particles, droplets having a uniform size can be obtained. Then, by bringing the liquid frame into contact with the base material, the molten rare earth fluoride adheres to the surface of the base material and solidifies and accumulates.
- the rare earth fluoride before melting, the molten rare earth fluoride, and the rare earth fluoride deposited on the substrate are oxidized at each stage to become a rare earth oxyfluoride.
- the rare earth oxyfluoride sprayed film is formed by scanning a predetermined area on the substrate surface while moving the liquefaction frame left and right or up and down along the substrate surface using an automatic machine (robot) or human hands. can do.
- the thickness of the sprayed film is preferably 10 ⁇ m or more, particularly preferably 30 ⁇ m or more, and is preferably 150 ⁇ m or less, particularly preferably 100 ⁇ m or less.
- the spraying conditions such as spraying distance, current value, voltage value, gas type, and gas supply amount, and conventionally known conditions can be applied. What is necessary is just to set suitably according to the use of the slurry to contain, the thermal spraying member obtained, etc.
- a rare earth oxide layer having a thickness of about 50 to 300 ⁇ m is previously used as an underlayer film, for example, atmospheric plasma sprayed at normal pressure.
- the rare earth oxyfluoride sprayed film may be formed after the atmospheric suspension plasma spraying.
- a sprayed film containing a rare earth oxyfluoride in particular, a sprayed film containing a rare earth oxyfluoride as a main phase.
- a thermal spray member provided with a film can be manufactured.
- the rare earth acid fluoride includes one or more rare earth acids selected from ReOF, Re 5 O 4 F 7 , Re 6 O 5 F 8 and Re 7 O 6 F 9 (Re represents a rare earth element). It is preferable that fluoride is contained.
- the sprayed film may contain a material other than the rare earth oxyfluoride.
- the sprayed film may contain a rare earth oxide and / or a rare earth fluoride in addition to the rare earth oxyfluoride.
- the sprayed film is particularly preferably a mixture of rare earth oxyfluoride, rare earth oxide and rare earth fluoride.
- the sprayed film in which the rare earth oxyfluoride is the main phase is a rare earth oxyfluoride with respect to the sum of the maximum peaks of the crystal phases constituting the sprayed film.
- the sum of the maximum peaks of the assigned peak phase may be 50% or more, particularly 60% or more, and it is particularly preferable that the maximum peak is a peak attributed to the rare earth acid fluoride. Furthermore, in suspension plasma spraying using the slurry of the present invention, a dense sprayed film having a porosity of 1% by volume or less, particularly 0.5% by volume or less can be obtained.
- Re 7 O 6 F 9 Re represents a rare earth element
- the element is preferably one or more selected from yttrium (Y), gadolinium (Gd), holmium (Ho), erbium (Er), ytterbium (Yb) and lutetium (Lu), and the rare earth element is yttrium.
- Y yttrium
- Gd gadolinium
- Ho holmium
- Er erbium
- Yb ytterbium
- Lu lutetium
- the rare earth element is yttrium.
- Gadolinium, ytterbium and lutetium, especially rare earth elements are yttrium only or Minutes and yttrium (e.g. 90 mol% or more), it is preferably made of the remainder of ytterbium or lutetium.
- Examples 1 to 7, Comparative Examples 1 and 2 [Production of rare earth fluoride particles and slurries of Examples 1 to 7] It adjusts with the rare earth element composition ratio of the rare earth fluorides shown in Table 1 or Table 2, and 1.2 kg of acidic ammonium fluoride powder is mixed with 1 kg of rare earth oxide, and in a nitrogen atmosphere at 650 ° C., 2 The rare earth fluoride was obtained by baking for a time. The obtained rare earth fluoride was pulverized with a jet mill and air classified to obtain rare earth fluoride particles having the maximum particle diameter (D100) shown in Table 1 or Table 2. Table 1 or Table 2 shows the particle size distribution (D100, D50) and BET specific surface area of the obtained rare earth fluoride particles.
- D100 maximum particle diameter
- Table 1 or Table 2 shows the particle size distribution (D100, D50) and BET specific surface area of the obtained rare earth fluoride particles.
- the particle size distribution was measured by a laser diffraction method, and the BET specific surface area was measured by a fully automatic specific surface area measuring device Macsorb HM model-1280 manufactured by Mountec Co., Ltd. (hereinafter the same).
- Table 1 or Table 2 shows the oxygen concentration (oxygen content) and fluorine concentration (fluorine content) of the obtained particles.
- the oxygen concentration was analyzed by an inert gas melting infrared absorption method using THC600 manufactured by LECO, and the fluorine concentration was analyzed by a dissolved ion chromatography method (the same applies hereinafter).
- the aggregation inhibitor shown in Table 1 or 2 and the fine particle additive are added to the rare earth fluoride particles obtained, and further shown in Table 1 or Table 2.
- a solvent was added, and these were put into a nylon pot containing 15 mm ⁇ nylon balls and mixed for about 2 hours.
- the obtained mixture was passed through a sieve having an opening of 500 mesh (25 ⁇ m) to obtain a rare earth fluoride slurry. .
- the aggregation inhibitor shown in Table 1 or Table 2 was added to the obtained yttrium oxyfluoride particles, and further the solvent shown in Table 1 or Table 2 was added, and 15 mm ⁇ nylon balls were added to these particles.
- the mixture was put into a nylon pot and mixed for about 2 hours, and the obtained mixture was passed through a sieve having an opening of 500 mesh (25 ⁇ m) to obtain a slurry of yttrium oxyfluoride.
- thermal spraying was performed with a thermal sprayer Triplex manufactured by Oerlikon Metco Co.
- thermal spraying was performed with a thermal spraying machine CITS manufactured by Progressive.
- the sprayed film was scraped from the obtained sprayed member and analyzed by X-ray diffraction. From the obtained X-ray profiles, the phases constituting each of the obtained sprayed films were identified, and the maximum peak intensity ratio was measured. Further, the oxygen concentration (oxygen content) of the sprayed film was analyzed by an inert gas melting infrared absorption method using THC600 manufactured by LECO, and the fluorine concentration (fluorine content) was analyzed by a solution ion chromatography method. .
- the porosity was measured by image analysis from the electron micrograph of the cross section of the sprayed film, and the hardness of the surface of the sprayed film was measured with a Vickers hardness meter AVK-C1 manufactured by Akashi Co., Ltd. (currently Mitutoyo Co., Ltd.). The results are shown in Table 5 or Table 6.
- the masking tape is peeled off, and using a laser microscope, the height difference due to corrosion between the exposed part and the masking part is measured at four points, and the average value is obtained as the height change amount. Corrosion resistance was evaluated. The results are shown in Table 5 or Table 6.
- Examples 1 to 7 in which a sprayed film was formed by atmospheric plasma suspension spraying using a slurry of rare earth fluoride particles having a maximum particle size (D100) of 12 ⁇ m or less, the rare earth fluoride particles were oxidized during the spraying, and the rare earth acid A fluoride is deposited.
- a sprayed film having a rare earth oxyfluoride as a main phase was obtained.
- a sprayed film having a low porosity, a high hardness, and excellent corrosion resistance was obtained. It has been.
- Examples 1 to 5 using an aqueous slurry the oxygen content of the sprayed film was further increased, and in Examples 6 and 7 using an organic solvent slurry, an increase in the oxygen content was suppressed.
Abstract
Description
[1] 酸素を含有するガスを含む雰囲気下でのサスペンションプラズマ溶射に用いられる溶射材料であって、最大粒子径(D100)が12μm以下の希土類フッ化物粒子を5質量%以上40質量%以下含有し、水及び有機溶媒から選ばれる1種又は2種以上を溶媒とすることを特徴とするサスペンションプラズマ溶射用スラリー。
[2] 更に、有機化合物からなる凝集防止剤を3質量%以下含有することを特徴とする[1]記載のサスペンションプラズマ溶射用スラリー。
[3] 更に、希土類酸化物、希土類水酸化物及び希土類炭酸塩から選ばれる1種又は2種以上の微粒子添加剤を5質量%以下含有することを特徴とする[1]又は[2]記載のサスペンションプラズマ溶射用スラリー。
[4] 希土類元素が、イットリウム(Y)、ガドリニウム(Gd)、ホルミウム(Ho)、エルビウム(Er)、イッテルビウム(Yb)及びルテチウム(Lu)から選ばれる1種又は2種以上であることを特徴とする[1]乃至[3]のいずれかに記載のサスペンションプラズマ溶射用スラリー。
[5] 上記サスペンションプラズマ溶射が、大気サスペンションプラズマ溶射であることを特徴とする[1]乃至[4]のいずれかに記載のサスペンションプラズマ溶射用スラリー。
[6] 基材上に、[1]乃至[4]のいずれかに記載のスラリーを溶射材料とし、酸素を含有するガスを含む雰囲気下で、サスペンションプラズマ溶射により溶射膜を形成する工程を含むことを特徴とする希土類酸フッ化物溶射膜の形成方法。
[7] 上記サスペンションプラズマ溶射が、大気サスペンションプラズマ溶射であることを特徴とする[6]記載の形成方法。
[8] 上記溶射膜が、希土類酸フッ化物を主相として含むことを特徴とする[6]又は[7]記載の形成方法。
[9] 上記希土類酸フッ化物が、ReOF、Re5O4F7、Re6O5F8及びRe7O6F9(Reは希土類元素を表す)から選ばれる1種又は2種以上の希土類酸フッ化物を含むことを特徴とする[6]乃至[8]のいずれかに記載の形成方法。
[10] 上記溶射膜が、希土類酸フッ化物と希土類酸化物と希土類フッ化物との混合物であることを特徴とする[6]乃至[9]のいずれかに記載の形成方法。
[11] 溶射膜が形成される基材と、希土類酸フッ化物を主相として含む溶射膜とを備えることを特徴とする溶射部材。
[12] 希土類元素が、イットリウム(Y)、ガドリニウム(Gd)、ホルミウム(Ho)、エルビウム(Er)、イッテルビウム(Yb)及びルテチウム(Lu)から選ばれる1種又は2種以上であることを特徴とする[11]記載の溶射部材。
[13] 上記希土類酸フッ化物が、ReOF、Re5O4F7、Re6O5F8及びRe7O6F9(Reは希土類元素を表す)から選ばれる1種又は2種以上の希土類酸フッ化物を含むことを特徴とする[11]又は[12]記載の溶射部材。
[14] 上記溶射膜が、希土類酸フッ化物と希土類酸化物と希土類フッ化物との混合物であることを特徴とする[11]乃至[13]のいずれかに記載の溶射部材。
[15] 上記溶射膜の厚さが、10μm以上150μm以下であることを特徴とする[11]乃至[14]のいずれかに記載の溶射部材。
[16] 上記溶射膜の気孔率が1%以下であることを特徴とする[11]乃至[15]のいずれかに記載の溶射部材。
本発明のスラリーは、酸素を含有するガスを含む雰囲気下でのサスペンションプラズマ溶射、特に、大気雰囲気下でプラズマを形成する大気サスペンションプラズマ溶射に好適に用いられる。本発明においては、プラズマが形成される周囲の雰囲気ガスが、大気の場合を、大気サスペンションプラズマ溶射と呼ぶ。また、プラズマが形成される場の圧力は、大気圧下などの常圧の他、加圧下、減圧下であってもよい。
〔実施例1~7の希土類フッ化物粒子及びスラリーの製造〕
表1又は表2に示される希土類フッ化物の希土類元素の組成比で調整し、希土類酸化物1kgに対して、酸性フッ化アンモニウム粉末1.2kgを混合し、窒素雰囲気中、650℃で、2時間焼成して、希土類フッ化物を得た。得られた希土類フッ化物は、ジェットミルで粉砕し、空気分級して、表1又は表2に示される最大粒子径(D100)の希土類フッ化物粒子とした。得られた希土類フッ化物粒子の粒度分布(D100、D50)及びBET比表面積を表1又は表2に示す。粒度分布はレーザー回折法、BET比表面積は、(株)マウンテック製、全自動比表面積測定装置 Macsorb HM model-1280で、各々測定した(以下同じ)。また、得られた粒子の酸素濃度(酸素含有率)及びフッ素濃度(フッ素含有率)を表1又は表2に示す。酸素濃度は、LECO社製、THC600を用いて不活性ガス融解赤外吸収法により、フッ素濃度は、溶解イオンクロマトグラフィ法により、各々分析した(以下同じ)。
酸化イットリウム1kgに対して、酸性フッ化アンモニウム粉末1.2kgを混合し、窒素雰囲気中、650℃で、4時間焼成して、酸フッ化イットリウムを得た。得られた酸フッ化イットリウムは、ジェットミルで粉砕し、空気分級して、表1又は表2に示される最大粒子径(D100)の酸フッ化イットリウム粒子とした。得られた酸フッ化イットリウム粒子の粒度分布(D100、D50)を表1又は表2に示す。また、得られた粒子の酸素濃度(酸素含有率)及びフッ素濃度(フッ素含有率)を表1又は表2に示す。
酸化イットリウム1kgに対して、酸性フッ化アンモニウム粉末1.2kgを混合し、窒素雰囲気中、650℃で、2時間で焼成して、フッ化イットリウムを得た。得られたフッ化イットリウムは、ジェットミルで粉砕し、バインダーとしてポリビニルアルコール(PVA)を添加してスラリーとし、スプレードライヤーを用いて造粒した後、窒素雰囲気中、700℃で、4時間焼成して、表1又は表2に示される最大粒子径(D100)のフッ化イットリウム粒子とした。得られたフッ化イットリウム粒子の粒度分布(D100、D50)を表1又は表2に示す。また、得られた粒子の酸素濃度(酸素含有率)及びフッ素濃度(フッ素含有率)を表1又は表2に示す。
実施例1~7及び比較例1の各々のスラリー又は比較例2の粒子を用い、予め常圧下の大気プラズマ溶射により、表面上に厚さ150μmの酸化イットリウムの下地膜を形成したアルミニウム基材に、表3又は表4に示される条件で、大気プラズマサスペンション溶射(実施例1~7及び比較例1)又は大気プラズマ溶射(比較例2)により、表3又は4に示される膜厚の溶射膜を形成した。実施例1、4及び5並びに比較例2は、エリコンメテコ社の溶射機Triplexにて、実施例2、3、6及び7並びに比較例1は、プログレッシブ社の溶射機CITSにて溶射を実施した。
得られた溶射部材から溶射膜を削り取り、X線回折法により分析した。得られたX線プロファイルから、得られた各々の溶射膜を構成する相を同定し、それらの最大ピーク強度比を測定した。また、溶射膜の酸素濃度(酸素含有率)は、LECO社製、THC600を用いて不活性ガス融解赤外吸収法により、フッ素濃度(フッ素含有率)は、溶解イオンクロマトグラフィ法により、各々分析した。更に、溶射膜の断面の電子顕微鏡写真から画像解析で気孔率を、溶射膜表面の硬度を、(株)アカシ(現(株)ミツトヨ)製ビッカース硬度計AVK-C1により、各々測定した。結果を表5又は表6に示す。
得られた溶射部材の溶射膜の表面上に、マスキングテープでマスキングした部分と、マスキングテープでマスキングしていない露出部分を形成し、リアクティブイオンプラズマ試験装置にセットして、周波数13.56MHz、プラズマ出力1,000W、エッチングガスCF4(80vol%)+O2(20vol%)、流量50sccm、ガス圧50mtorr(6.7Pa)、12時間の条件で、プラズマ耐食性試験を行った。試験後、マスキングテープを剥がし、レーザー顕微鏡を使用して、露出部分とマスキング部分との間の、腐食による高さの差を4点測定して、平均値を高さ変化量として求めることにより、耐食性を評価した。結果を表5又は表6に示す。
Claims (16)
- 酸素を含有するガスを含む雰囲気下でのサスペンションプラズマ溶射に用いられる溶射材料であって、最大粒子径(D100)が12μm以下の希土類フッ化物粒子を5質量%以上40質量%以下含有し、水及び有機溶媒から選ばれる1種又は2種以上を溶媒とすることを特徴とするサスペンションプラズマ溶射用スラリー。
- 更に、有機化合物からなる凝集防止剤を3質量%以下含有することを特徴とする請求項1記載のサスペンションプラズマ溶射用スラリー。
- 更に、希土類酸化物、希土類水酸化物及び希土類炭酸塩から選ばれる1種又は2種以上の微粒子添加剤を5質量%以下含有することを特徴とする請求項1又は2記載のサスペンションプラズマ溶射用スラリー。
- 希土類元素が、イットリウム(Y)、ガドリニウム(Gd)、ホルミウム(Ho)、エルビウム(Er)、イッテルビウム(Yb)及びルテチウム(Lu)から選ばれる1種又は2種以上であることを特徴とする請求項1乃至3のいずれか1項記載のサスペンションプラズマ溶射用スラリー。
- 上記サスペンションプラズマ溶射が、大気サスペンションプラズマ溶射であることを特徴とする請求項1乃至4のいずれか1項記載のサスペンションプラズマ溶射用スラリー。
- 基材上に、請求項1乃至4のいずれか1項記載のスラリーを溶射材料とし、酸素を含有するガスを含む雰囲気下で、サスペンションプラズマ溶射により溶射膜を形成する工程を含むことを特徴とする希土類酸フッ化物溶射膜の形成方法。
- 上記サスペンションプラズマ溶射が、大気サスペンションプラズマ溶射であることを特徴とする請求項6記載の形成方法。
- 上記溶射膜が、希土類酸フッ化物を主相として含むことを特徴とする請求項6又は7記載の形成方法。
- 上記希土類酸フッ化物が、ReOF、Re5O4F7、Re6O5F8及びRe7O6F9(Reは希土類元素を表す)から選ばれる1種又は2種以上の希土類酸フッ化物を含むことを特徴とする請求項6乃至8のいずれか1項記載の形成方法。
- 上記溶射膜が、希土類酸フッ化物と希土類酸化物と希土類フッ化物との混合物であることを特徴とする請求項6乃至9のいずれか1項記載の形成方法。
- 溶射膜が形成される基材と、希土類酸フッ化物を主相として含む溶射膜とを備えることを特徴とする溶射部材。
- 希土類元素が、イットリウム(Y)、ガドリニウム(Gd)、ホルミウム(Ho)、エルビウム(Er)、イッテルビウム(Yb)及びルテチウム(Lu)から選ばれる1種又は2種以上であることを特徴とする請求項11記載の溶射部材。
- 上記希土類酸フッ化物が、ReOF、Re5O4F7、Re6O5F8及びRe7O6F9(Reは希土類元素を表す)から選ばれる1種又は2種以上の希土類酸フッ化物を含むことを特徴とする請求項11又は12記載の溶射部材。
- 上記溶射膜が、希土類酸フッ化物と希土類酸化物と希土類フッ化物との混合物であることを特徴とする請求項11乃至13のいずれか1項記載の溶射部材。
- 上記溶射膜の厚さが、10μm以上150μm以下であることを特徴とする請求項11乃至14のいずれか1項記載の溶射部材。
- 上記溶射膜の気孔率が1%以下であることを特徴とする請求項11乃至15のいずれか1項記載の溶射部材。
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JP6939853B2 (ja) * | 2018-08-15 | 2021-09-22 | 信越化学工業株式会社 | 溶射皮膜、溶射皮膜の製造方法、及び溶射部材 |
KR20220116489A (ko) * | 2019-12-18 | 2022-08-23 | 신에쓰 가가꾸 고교 가부시끼가이샤 | 불화이트륨계 용사 피막, 용사 부재, 및 불화이트륨계 용사 피막의 제조 방법 |
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US20210277509A1 (en) | 2021-09-09 |
KR20190027880A (ko) | 2019-03-15 |
CN109477199A (zh) | 2019-03-15 |
TWI735618B (zh) | 2021-08-11 |
TW202128565A (zh) | 2021-08-01 |
CN109477199B (zh) | 2021-07-06 |
TWI759124B (zh) | 2022-03-21 |
JP6347310B2 (ja) | 2018-06-27 |
KR20220148320A (ko) | 2022-11-04 |
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US20240051839A1 (en) | 2024-02-15 |
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