US20140057078A1 - Rare earth element oxyflouride powder spray material and sprayed article - Google Patents
Rare earth element oxyflouride powder spray material and sprayed article Download PDFInfo
- Publication number
- US20140057078A1 US20140057078A1 US13/971,889 US201313971889A US2014057078A1 US 20140057078 A1 US20140057078 A1 US 20140057078A1 US 201313971889 A US201313971889 A US 201313971889A US 2014057078 A1 US2014057078 A1 US 2014057078A1
- Authority
- US
- United States
- Prior art keywords
- rare earth
- earth element
- spray material
- weight
- sprayed
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Abandoned
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- 229910052761 rare earth metal Inorganic materials 0.000 title claims abstract description 62
- 239000000463 material Substances 0.000 title claims abstract description 47
- 229940098458 powder spray Drugs 0.000 title 1
- 239000007921 spray Substances 0.000 claims abstract description 42
- 239000002245 particle Substances 0.000 claims abstract description 38
- 238000000576 coating method Methods 0.000 claims abstract description 30
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 19
- 229910052799 carbon Inorganic materials 0.000 claims abstract description 19
- 239000011248 coating agent Substances 0.000 claims abstract description 18
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims abstract description 16
- 239000001301 oxygen Substances 0.000 claims abstract description 16
- 229910052760 oxygen Inorganic materials 0.000 claims abstract description 16
- 238000007750 plasma spraying Methods 0.000 claims abstract description 13
- KRHYYFGTRYWZRS-UHFFFAOYSA-M Fluoride anion Chemical compound [F-] KRHYYFGTRYWZRS-UHFFFAOYSA-M 0.000 claims description 16
- 239000000758 substrate Substances 0.000 claims description 12
- 238000002156 mixing Methods 0.000 claims description 6
- 229910052727 yttrium Inorganic materials 0.000 claims description 6
- 238000010304 firing Methods 0.000 claims description 5
- 229910052691 Erbium Inorganic materials 0.000 claims description 3
- 229910052688 Gadolinium Inorganic materials 0.000 claims description 3
- 238000001020 plasma etching Methods 0.000 abstract description 4
- 239000000843 powder Substances 0.000 description 22
- 238000005260 corrosion Methods 0.000 description 14
- 230000007797 corrosion Effects 0.000 description 14
- 239000007789 gas Substances 0.000 description 11
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 10
- 239000000203 mixture Substances 0.000 description 10
- 229920002134 Carboxymethyl cellulose Polymers 0.000 description 8
- 235000010948 carboxy methyl cellulose Nutrition 0.000 description 8
- 238000007751 thermal spraying Methods 0.000 description 7
- 239000011230 binding agent Substances 0.000 description 6
- 238000000034 method Methods 0.000 description 6
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 5
- 229910052786 argon Inorganic materials 0.000 description 5
- 230000000052 comparative effect Effects 0.000 description 5
- 229920000036 polyvinylpyrrolidone Polymers 0.000 description 5
- 235000013855 polyvinylpyrrolidone Nutrition 0.000 description 5
- 239000004065 semiconductor Substances 0.000 description 5
- 239000002002 slurry Substances 0.000 description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 5
- YCKRFDGAMUMZLT-UHFFFAOYSA-N Fluorine atom Chemical compound [F] YCKRFDGAMUMZLT-UHFFFAOYSA-N 0.000 description 4
- 239000011737 fluorine Substances 0.000 description 4
- 229910052731 fluorine Inorganic materials 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 4
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 3
- 239000004372 Polyvinyl alcohol Substances 0.000 description 3
- 229910052782 aluminium Inorganic materials 0.000 description 3
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 3
- 239000001768 carboxy methyl cellulose Substances 0.000 description 3
- 239000008112 carboxymethyl-cellulose Substances 0.000 description 3
- 238000000354 decomposition reaction Methods 0.000 description 3
- 238000009826 distribution Methods 0.000 description 3
- 229910052736 halogen Inorganic materials 0.000 description 3
- 150000002367 halogens Chemical class 0.000 description 3
- 239000001257 hydrogen Substances 0.000 description 3
- 229910052739 hydrogen Inorganic materials 0.000 description 3
- 229920002451 polyvinyl alcohol Polymers 0.000 description 3
- 235000019422 polyvinyl alcohol Nutrition 0.000 description 3
- 238000012360 testing method Methods 0.000 description 3
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 2
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 2
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 2
- 238000004458 analytical method Methods 0.000 description 2
- 229910052804 chromium Inorganic materials 0.000 description 2
- 239000011651 chromium Substances 0.000 description 2
- 238000002485 combustion reaction Methods 0.000 description 2
- 125000002887 hydroxy group Chemical group [H]O* 0.000 description 2
- 229910052757 nitrogen Inorganic materials 0.000 description 2
- 239000001267 polyvinylpyrrolidone Substances 0.000 description 2
- 238000002360 preparation method Methods 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 238000001694 spray drying Methods 0.000 description 2
- 238000005507 spraying Methods 0.000 description 2
- TXEYQDLBPFQVAA-UHFFFAOYSA-N tetrafluoromethane Chemical compound FC(F)(F)F TXEYQDLBPFQVAA-UHFFFAOYSA-N 0.000 description 2
- VWQVUPCCIRVNHF-UHFFFAOYSA-N yttrium atom Chemical compound [Y] VWQVUPCCIRVNHF-UHFFFAOYSA-N 0.000 description 2
- 238000012935 Averaging Methods 0.000 description 1
- 229910015844 BCl3 Inorganic materials 0.000 description 1
- KZBUYRJDOAKODT-UHFFFAOYSA-N Chlorine Chemical compound ClCl KZBUYRJDOAKODT-UHFFFAOYSA-N 0.000 description 1
- ZAMOUSCENKQFHK-UHFFFAOYSA-N Chlorine atom Chemical compound [Cl] ZAMOUSCENKQFHK-UHFFFAOYSA-N 0.000 description 1
- 229910020323 ClF3 Inorganic materials 0.000 description 1
- 229910016495 ErF3 Inorganic materials 0.000 description 1
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 1
- KRHYYFGTRYWZRS-UHFFFAOYSA-N Fluorane Chemical compound F KRHYYFGTRYWZRS-UHFFFAOYSA-N 0.000 description 1
- XPDWGBQVDMORPB-UHFFFAOYSA-N Fluoroform Chemical compound FC(F)F XPDWGBQVDMORPB-UHFFFAOYSA-N 0.000 description 1
- 229910005693 GdF3 Inorganic materials 0.000 description 1
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 description 1
- 238000004566 IR spectroscopy Methods 0.000 description 1
- 229910052765 Lutetium Inorganic materials 0.000 description 1
- AFCARXCZXQIEQB-UHFFFAOYSA-N N-[3-oxo-3-(2,4,6,7-tetrahydrotriazolo[4,5-c]pyridin-5-yl)propyl]-2-[[3-(trifluoromethoxy)phenyl]methylamino]pyrimidine-5-carboxamide Chemical compound O=C(CCNC(=O)C=1C=NC(=NC=1)NCC1=CC(=CC=C1)OC(F)(F)F)N1CC2=C(CC1)NN=N2 AFCARXCZXQIEQB-UHFFFAOYSA-N 0.000 description 1
- 229910052581 Si3N4 Inorganic materials 0.000 description 1
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 1
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 description 1
- 238000005054 agglomeration Methods 0.000 description 1
- 230000002776 aggregation Effects 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 1
- 125000004432 carbon atom Chemical group C* 0.000 description 1
- 229910002092 carbon dioxide Inorganic materials 0.000 description 1
- 239000001569 carbon dioxide Substances 0.000 description 1
- 229920006184 cellulose methylcellulose Polymers 0.000 description 1
- 239000000460 chlorine Substances 0.000 description 1
- 229910052801 chlorine Inorganic materials 0.000 description 1
- PMHQVHHXPFUNSP-UHFFFAOYSA-M copper(1+);methylsulfanylmethane;bromide Chemical compound Br[Cu].CSC PMHQVHHXPFUNSP-UHFFFAOYSA-M 0.000 description 1
- 230000001186 cumulative effect Effects 0.000 description 1
- 239000008367 deionised water Substances 0.000 description 1
- 229910021641 deionized water Inorganic materials 0.000 description 1
- 230000003111 delayed effect Effects 0.000 description 1
- 238000002050 diffraction method Methods 0.000 description 1
- 229910001873 dinitrogen Inorganic materials 0.000 description 1
- 238000004090 dissolution Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- UYAHIZSMUZPPFV-UHFFFAOYSA-N erbium Chemical compound [Er] UYAHIZSMUZPPFV-UHFFFAOYSA-N 0.000 description 1
- VQCBHWLJZDBHOS-UHFFFAOYSA-N erbium(III) oxide Inorganic materials O=[Er]O[Er]=O VQCBHWLJZDBHOS-UHFFFAOYSA-N 0.000 description 1
- 125000001153 fluoro group Chemical group F* 0.000 description 1
- UIWYJDYFSGRHKR-UHFFFAOYSA-N gadolinium atom Chemical compound [Gd] UIWYJDYFSGRHKR-UHFFFAOYSA-N 0.000 description 1
- CMIHHWBVHJVIGI-UHFFFAOYSA-N gadolinium(III) oxide Inorganic materials [O-2].[O-2].[O-2].[Gd+3].[Gd+3] CMIHHWBVHJVIGI-UHFFFAOYSA-N 0.000 description 1
- 239000001307 helium Substances 0.000 description 1
- 229910052734 helium Inorganic materials 0.000 description 1
- SWQJXJOGLNCZEY-UHFFFAOYSA-N helium atom Chemical compound [He] SWQJXJOGLNCZEY-UHFFFAOYSA-N 0.000 description 1
- 229910000040 hydrogen fluoride Inorganic materials 0.000 description 1
- 239000011261 inert gas Substances 0.000 description 1
- 239000004615 ingredient Substances 0.000 description 1
- 238000004255 ion exchange chromatography Methods 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- 229910052746 lanthanum Inorganic materials 0.000 description 1
- FZLIPJUXYLNCLC-UHFFFAOYSA-N lanthanum atom Chemical compound [La] FZLIPJUXYLNCLC-UHFFFAOYSA-N 0.000 description 1
- 238000007561 laser diffraction method Methods 0.000 description 1
- OHSVLFRHMCKCQY-UHFFFAOYSA-N lutetium atom Chemical compound [Lu] OHSVLFRHMCKCQY-UHFFFAOYSA-N 0.000 description 1
- 230000000873 masking effect Effects 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 229910044991 metal oxide Inorganic materials 0.000 description 1
- 150000004706 metal oxides Chemical class 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 229920000620 organic polymer Polymers 0.000 description 1
- SIWVEOZUMHYXCS-UHFFFAOYSA-N oxo(oxoyttriooxy)yttrium Chemical compound O=[Y]O[Y]=O SIWVEOZUMHYXCS-UHFFFAOYSA-N 0.000 description 1
- 238000005389 semiconductor device fabrication Methods 0.000 description 1
- HBMJWWWQQXIZIP-UHFFFAOYSA-N silicon carbide Chemical compound [Si+]#[C-] HBMJWWWQQXIZIP-UHFFFAOYSA-N 0.000 description 1
- 229910010271 silicon carbide Inorganic materials 0.000 description 1
- HQVNEWCFYHHQES-UHFFFAOYSA-N silicon nitride Chemical compound N12[Si]34N5[Si]62N3[Si]51N64 HQVNEWCFYHHQES-UHFFFAOYSA-N 0.000 description 1
- 239000002904 solvent Substances 0.000 description 1
- 239000012798 spherical particle Substances 0.000 description 1
- SFZCNBIFKDRMGX-UHFFFAOYSA-N sulfur hexafluoride Chemical compound FS(F)(F)(F)(F)F SFZCNBIFKDRMGX-UHFFFAOYSA-N 0.000 description 1
- FAQYAMRNWDIXMY-UHFFFAOYSA-N trichloroborane Chemical compound ClB(Cl)Cl FAQYAMRNWDIXMY-UHFFFAOYSA-N 0.000 description 1
- JOHWNGGYGAVMGU-UHFFFAOYSA-N trifluorochlorine Chemical compound FCl(F)F JOHWNGGYGAVMGU-UHFFFAOYSA-N 0.000 description 1
- QGJSAGBHFTXOTM-UHFFFAOYSA-K trifluoroerbium Chemical compound F[Er](F)F QGJSAGBHFTXOTM-UHFFFAOYSA-K 0.000 description 1
- 238000010290 vacuum plasma spraying Methods 0.000 description 1
- 229940105963 yttrium fluoride Drugs 0.000 description 1
- RBORBHYCVONNJH-UHFFFAOYSA-K yttrium(iii) fluoride Chemical compound F[Y](F)F RBORBHYCVONNJH-UHFFFAOYSA-K 0.000 description 1
- 229910052725 zinc Inorganic materials 0.000 description 1
- 239000011701 zinc Substances 0.000 description 1
Classifications
-
- 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
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D5/00—Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes
- C09D5/18—Fireproof paints including high temperature resistant paints
-
- 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
- C23C4/12—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
-
- 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.]
- Y10T428/24355—Continuous and nonuniform or irregular surface on layer or component [e.g., roofing, etc.]
- Y10T428/24372—Particulate matter
- Y10T428/24413—Metal or metal compound
-
- 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
- Y10T428/29—Coated or structually defined flake, particle, cell, strand, strand portion, rod, filament, macroscopic fiber or mass thereof
- Y10T428/2982—Particulate matter [e.g., sphere, flake, etc.]
Definitions
- This invention relates to a thermal spraying material in the form of rare earth element oxyfluoride powder, especially suited for use to form a sprayed coating having high corrosion resistance in a corrosive plasma atmosphere as encountered in the semiconductor device fabrication process, and an article having a sprayed coating of the thermal spraying material.
- sprayed coatings having high corrosion resistance are used for protecting substrates in a variety of service environments. While aluminum, chromium and similar metal oxides are often used as the thermal spray material, the sprayed coatings of these oxide materials are susceptible to corrosion upon exposure to hot plasma. These materials are thus inadequate for use in the semiconductor manufacturing process which may typically involve treatment in a halogen-based corrosive gas plasma atmosphere.
- the halogen-based corrosive gas plasma atmosphere used in the fabrication of semiconductor devices contains fluorine-based gases such as SF 6 , CF 4 , CHF 3 , ClF 3 and HF or chlorine-based gases such as Cl 2 , BCl 3 and HCl.
- Known articles which can be used in such extremely corrosive atmospheres include, for example, articles having corrosion resistant coatings formed thereon by spraying yttrium oxide (Patent Document 1) and yttrium fluoride (Patent Documents 2 and 3) to their surface.
- yttrium oxide Patent Document 1
- yttrium fluoride Patent Documents 2 and 3
- rare earth element oxide sprayed articles are generally prepared by plasma spraying rare earth element oxide, they are long used as the sprayed articles in the industrial semiconductor fabrication process because of least technical problems.
- the rare earth element fluoride sprayed coatings suffer from a technical problem despite good corrosion resistance.
- the plasma spraying of rare earth element fluoride has the problem that when the rare earth element fluoride is passed through a flame at 3,000° C.
- the fluoride can be decomposed so that the material partially converts to a mixture of rare earth element fluoride and rare earth element oxide. For this reason, practical utilization of rare earth element fluoride sprayed articles is delayed as compared with the rare earth element oxide sprayed articles.
- An object of the invention is to provide a thermal spray material in the form of rare earth element oxyfluoride powder which is used to form sprayed coatings having higher corrosion resistance than conventional sprayed coatings of rare earth element oxide or fluoride, and a sprayed article having a sprayed coating of rare earth element oxyfluoride.
- a spray material comprising rare earth element oxyfluoride particles having an aspect ratio of up to 2 as shape index, an average particle size of 10 to 100 ⁇ m, and a bulk density of 0.8 to 2 g/cm 3 , and containing not more than 0.5% by weight of carbon and 3 to 15% by weight of oxygen is effective for plasma spraying, and that better results are obtained by plasma spraying the rare earth element oxyfluoride spray material onto a substrate such that the sprayed coating may have a carbon content of up to 0.1% by weight and an oxygen content of 3 to 15% by weight.
- the invention provides a spray material comprising rare earth element oxyfluoride particles having an aspect ratio of up to 2, an average particle size of 10 to 100 ⁇ m, and a bulk density of 0.8 to 2 g/cm 3 , and containing not more than 0.5% by weight of carbon and 3 to 15% by weight of oxygen.
- the rare earth element is one or more elements selected from the group consisting of Y and Group 3A elements from La to Lu.
- the rare earth element is Y, Gd or Er.
- the spray material is preferably obtained by mixing 10 to 70% by weight of rare earth element oxide particles having an average particle size of 0.01 to 5 ⁇ m and the balance of rare earth element fluoride particles having an average particle size of 0.1 to 5 ⁇ m, agglomerating, and firing.
- the invention provides a rare earth element oxyfluoride-sprayed article comprising a substrate and a sprayed coating which is deposited on the substrate by plasma spraying the spray material defined herein, the sprayed coating having a carbon content of not more than 0.1% by weight and an oxygen content of 3 to 15% by weight.
- the spray material in the form of rare earth element oxyfluoride powder is amenable to atmospheric plasma spraying.
- An article having a sprayed coating of the rare earth element oxyfluoride has higher resistance against plasma etching than those articles having sprayed coatings of rare earth element oxide and fluoride when used in a halogen gas plasma. High corrosion resistance ensures a long lifetime.
- One embodiment of the invention is a thermal spray material comprising rare earth element oxyfluoride particles having an aspect ratio of up to 2 as shape index, an average particle size of 10 ⁇ m to 100 ⁇ m, and a bulk density of 0.8 g/cm 3 to 2 g/cm 3 , and containing not more than 0.5% by weight of carbon and 3% to 15% by weight of oxygen.
- This thermal spray material is effective for plasma spraying a rare earth element oxyfluoride in air.
- the thermal spray powder should desirably meet the requirements including (1) smooth flow and (2) that the material is not decomposed into oxides by plasma spraying.
- the spray material defined herein has these advantages.
- the thermal spray material should preferably comprise particles of spherical shape.
- a poor fluidity may make the material inconvenient to feed such as by clogging a feed tube.
- the spray material should preferably consist of spherical particles.
- the particles have an aspect ratio of up to 2, preferably up to 1.5.
- the “aspect ratio” is used herein as one shape index of the three dimensions and refers to a ratio of length to breadth of a particle.
- the rare earth element used in the rare earth element oxyfluoride spray material may be selected from among yttrium (Y) and Group 3A elements inclusive of lanthanum (La) to lutetium (Lu). Of these, yttrium (Y), gadolinium (Gd) and erbium (Er) are preferred. A mixture of two or more rare earth elements is also acceptable. When such a mixture is used, the spray material may be obtained by agglomerating a mixture of raw materials, or by forming particles of a single element and mixing such particles of different elements prior to use.
- the spray material has an average particle size of 10 ⁇ m to 100 ⁇ m, preferably 15 ⁇ m to 60 ⁇ m.
- the average particle size is determined as a weight average value D 50 (i.e., a particle diameter or median diameter when the cumulative weight reaches 50%) by a particle size distribution measurement unit based on the laser light diffractometry. If the particle size of spray material is too small, such particles may evaporate in the flame, resulting in a lower yield of spraying. If the size of spray material is too large, such particles may not be completely melted in the flame, resulting in a sprayed coating of deteriorated quality.
- Particles as agglomerated to constitute the spray material should be solid, i.e., filled to the interior (or free of voids), because solid particles are stable (or do not chip or collapse) during handling, and because the problem arising from voids in particles that undesirable gas component can be trapped in voids is avoidable.
- the spray material should have a bulk density of 0.8 g/cm 3 to 2 g/cm 3 , preferably 1.2 g/cm 3 to 1.8 g/cm 3 .
- the atmospheric plasma spraying of rare earth element oxyfluoride has a possibility that the oxyfluoride is decomposed into oxide.
- the spray material (or powder) contains a noticeable amount of water or hydroxyl, it facilitates decomposition of the oxyfluoride into a rare earth element oxide and the liberated fluorine forms a gas such as hydrogen fluoride.
- the resulting sprayed coating becomes a mixture of rare earth element oxide and rare earth element fluoride.
- the raw material to be agglomerated into the spray powder should preferably have a water or hydroxyl content of up to 10,000 ppm, more preferably up to 5,000 ppm, and even more preferably up to 1,000 ppm.
- the spray material (or powder) contains carbon in a concentration of not more than 0.5% by weight, preferably not more than 0.3% by weight, and more preferably not more than 0.1% by weight. If the carbon content is too high, such carbon can react with oxygen of the rare earth element oxyfluoride to form carbon dioxide, causing decomposition of the rare earth element oxyfluoride. As long as the carbon content is limited low, decomposition of the rare earth element oxyfluoride during thermal spraying is inhibited and a satisfactory coating of rare earth element oxyfluoride is deposited.
- the rare earth element oxyfluoride spray material defined above can be prepared by agglomerating (or granulating) rare earth element oxyfluoride or by mixing rare earth element oxide and rare earth element fluoride and agglomerating the mixture.
- the spray material is prepared by dispersing a starting powder in a solvent such as water or an alcohol of 1 to 4 carbon atoms to form a slurry having a concentration of 10 to 40% by weight and agglomerating the slurry by spray drying or analogous technique.
- the mixture may consist of 10 to 70% by weight of rare earth element oxide and the balance of rare earth element fluoride.
- the spray material may be prepared by mixing a rare earth element oxyfluoride with an organic polymer serving as a binder such as carboxymethyl cellulose and deionized water to form a slurry and agglomerating by spray drying or analogous technique.
- a binder such as carboxymethyl cellulose and deionized water
- Examples of the binder used herein include polyvinyl alcohol and polyvinyl pyrrolidone as well as carboxymethyl cellulose.
- the binder is typically added in an amount of 0.05 to 10% by weight based on the weight of the rare earth element oxyfluoride to form a slurry.
- the particles as agglomerated are fired at a temperature of 600° C. to 1600° C. in air, vacuum or an inert gas atmosphere for the purpose of removing the binder and water. Firing in an oxygen-containing atmosphere is preferred for carbon removal.
- a rare earth element oxyfluoride-sprayed article is obtainable.
- the sprayed coating on the substrate should have a carbon content of not more than 0.1% by weight, preferably 0.01 to 0.03% by weight and an oxygen content of 3 to 15% by weight, preferably 5 to 13% by weight.
- Thermal spraying to a component of the semiconductor fabrication equipment is desirably atmospheric plasma spraying or vacuum plasma spraying.
- the plasma gas used herein may be nitrogen/hydrogen, argon/hydrogen, argon/helium, argon/nitrogen, argon alone, or nitrogen gas alone, but not limited thereto.
- the substrate subject to thermal spraying include, but are not limited to, substrates of aluminum, nickel, chromium, zinc, and alloys thereof, alumina, aluminum nitride, silicon nitride, silicon carbide, and quartz glass which constitute components of the semiconductor equipment.
- the sprayed coating typically has a thickness of 50 to 500 ⁇ m.
- the conditions under which the rare earth element oxyfluoride powder is thermally sprayed are not particularly limited. The thermal spraying conditions may be determined as appropriate depending on the identity of substrate, a particular composition of the rare earth element oxyfluoride spray material, and a particular application of the resulting sprayed article.
- the resulting sprayed article has higher resistance against plasma etching (i.e., corrosion resistance) than sprayed coatings of rare earth element oxide and fluoride. Thus a long lifetime is available.
- a spray powder material was obtained by providing a starting powder or mixing ingredients in a predetermined ratio to form a starting powder as shown in Table 1, dispersing the starting powder in a binder (Table 1) to form a slurry, agglomerating in a spray dryer, and firing under selected conditions (Table 1).
- the resulting spray powder was measured for particle aspect ratio, particle size distribution, bulk density, and oxygen, fluorine and carbon concentrations. The results are shown in Table 1.
- the particle size distribution was measured by the laser diffraction method, the fluorine concentration analyzed by dissolution ion chromatography, and the carbon and oxygen concentrations analyzed by the combustion and infrared (IR) spectroscopy method.
- the aspect ratio of particles was determined by taking a scanning electron microscope (SEM) photo, measuring the length and breadth of 180 particles in the photo, and averaging.
- the spray powder materials in Examples 1 to 4 and Comparative Examples 1 and 2 were air plasma sprayed to aluminum substrates using a gas mixture of 40 L/min of argon and 5 L/min of hydrogen.
- the resulting articles had a sprayed coating of about 200 ⁇ m thick.
- the sprayed coatings of powder materials in Examples 1 to 4 looked black, whereas the sprayed coatings of powder materials in Comparative Examples 1 and 2 were white.
- the carbon and oxygen concentrations of each sprayed coating were measured by the combustion and IR method. The results are shown in Table 1.
- Each article was masked with masking tape to define a masked and exposed section before it was mounted on a reactive ion plasma tester.
- a plasma corrosion test was performed under conditions: frequency 13.56 MHz, plasma power 1,000 watts, gas mixture CF 4 +O 2 (20 vol %), flow rate 50 sccm, gas pressure 50 mTorr, and time 12 hours.
- a step formed between the exposed and masked sections due to corrosion. The height of the step was measured at 4 points by a laser microscope and averaged as an index for corrosion resistance. The results are shown in Table 1.
- the sprayed coatings obtained from the rare earth element oxyfluoride powder materials in Examples 1 to 4 have higher resistance against plasma etching (corrosion resistance) than the sprayed coatings from the rare earth element oxide and fluoride in Comparative Examples 1 and 2.
Abstract
A spray material comprising rare earth element oxyfluoride particles having an aspect ratio of up to 2, an average particle size of 10-100 μm, and a bulk density of 0.8-2 g/cm3, and containing not more than 0.5 wt % of carbon and 3-15 wt % of oxygen is suitable for air plasma spraying. An article having a sprayed coating of rare earth element oxyfluoride has high resistance against plasma etching and a long lifetime.
Description
- This non-provisional application claims priority under 35 U.S.C. §119(a) on Patent Application No. 2012-183302 filed in Japan on Aug. 22, 2012, the entire contents of which are hereby incorporated by reference.
- This invention relates to a thermal spraying material in the form of rare earth element oxyfluoride powder, especially suited for use to form a sprayed coating having high corrosion resistance in a corrosive plasma atmosphere as encountered in the semiconductor device fabrication process, and an article having a sprayed coating of the thermal spraying material.
- In the prior art, sprayed coatings having high corrosion resistance are used for protecting substrates in a variety of service environments. While aluminum, chromium and similar metal oxides are often used as the thermal spray material, the sprayed coatings of these oxide materials are susceptible to corrosion upon exposure to hot plasma. These materials are thus inadequate for use in the semiconductor manufacturing process which may typically involve treatment in a halogen-based corrosive gas plasma atmosphere.
- The halogen-based corrosive gas plasma atmosphere used in the fabrication of semiconductor devices contains fluorine-based gases such as SF6, CF4, CHF3, ClF3 and HF or chlorine-based gases such as Cl2, BCl3 and HCl.
- Known articles which can be used in such extremely corrosive atmospheres include, for example, articles having corrosion resistant coatings formed thereon by spraying yttrium oxide (Patent Document 1) and yttrium fluoride (Patent Documents 2 and 3) to their surface. While rare earth element oxide sprayed articles are generally prepared by plasma spraying rare earth element oxide, they are long used as the sprayed articles in the industrial semiconductor fabrication process because of least technical problems. On the other hand, the rare earth element fluoride sprayed coatings suffer from a technical problem despite good corrosion resistance. The plasma spraying of rare earth element fluoride has the problem that when the rare earth element fluoride is passed through a flame at 3,000° C. or higher for melting, the fluoride can be decomposed so that the material partially converts to a mixture of rare earth element fluoride and rare earth element oxide. For this reason, practical utilization of rare earth element fluoride sprayed articles is delayed as compared with the rare earth element oxide sprayed articles.
-
- Patent Document 1: JP 4006596 (US 6852433)
- Patent Document 2: JP 3523222 (US 20020015853)
- Patent Document 3: JP-A 2011-514933 (US 20090214825)
- An object of the invention is to provide a thermal spray material in the form of rare earth element oxyfluoride powder which is used to form sprayed coatings having higher corrosion resistance than conventional sprayed coatings of rare earth element oxide or fluoride, and a sprayed article having a sprayed coating of rare earth element oxyfluoride.
- The inventors have found that a spray material comprising rare earth element oxyfluoride particles having an aspect ratio of up to 2 as shape index, an average particle size of 10 to 100 μm, and a bulk density of 0.8 to 2 g/cm3, and containing not more than 0.5% by weight of carbon and 3 to 15% by weight of oxygen is effective for plasma spraying, and that better results are obtained by plasma spraying the rare earth element oxyfluoride spray material onto a substrate such that the sprayed coating may have a carbon content of up to 0.1% by weight and an oxygen content of 3 to 15% by weight.
- In one aspect, the invention provides a spray material comprising rare earth element oxyfluoride particles having an aspect ratio of up to 2, an average particle size of 10 to 100 μm, and a bulk density of 0.8 to 2 g/cm3, and containing not more than 0.5% by weight of carbon and 3 to 15% by weight of oxygen.
- Preferably, the rare earth element is one or more elements selected from the group consisting of Y and Group 3A elements from La to Lu. Typically, the rare earth element is Y, Gd or Er.
- The spray material is preferably obtained by mixing 10 to 70% by weight of rare earth element oxide particles having an average particle size of 0.01 to 5 μm and the balance of rare earth element fluoride particles having an average particle size of 0.1 to 5 μm, agglomerating, and firing.
- In another aspect, the invention provides a rare earth element oxyfluoride-sprayed article comprising a substrate and a sprayed coating which is deposited on the substrate by plasma spraying the spray material defined herein, the sprayed coating having a carbon content of not more than 0.1% by weight and an oxygen content of 3 to 15% by weight.
- The spray material in the form of rare earth element oxyfluoride powder is amenable to atmospheric plasma spraying. An article having a sprayed coating of the rare earth element oxyfluoride has higher resistance against plasma etching than those articles having sprayed coatings of rare earth element oxide and fluoride when used in a halogen gas plasma. High corrosion resistance ensures a long lifetime.
- One embodiment of the invention is a thermal spray material comprising rare earth element oxyfluoride particles having an aspect ratio of up to 2 as shape index, an average particle size of 10 μm to 100 μm, and a bulk density of 0.8 g/cm3 to 2 g/cm3, and containing not more than 0.5% by weight of carbon and 3% to 15% by weight of oxygen. This thermal spray material is effective for plasma spraying a rare earth element oxyfluoride in air. In general, the thermal spray powder should desirably meet the requirements including (1) smooth flow and (2) that the material is not decomposed into oxides by plasma spraying. The spray material defined herein has these advantages.
- The thermal spray material should preferably comprise particles of spherical shape. When a spray material is fed into a flame for thermal spraying, a poor fluidity may make the material inconvenient to feed such as by clogging a feed tube. To ensure smooth flow, the spray material should preferably consist of spherical particles. The particles have an aspect ratio of up to 2, preferably up to 1.5. The “aspect ratio” is used herein as one shape index of the three dimensions and refers to a ratio of length to breadth of a particle.
- The rare earth element used in the rare earth element oxyfluoride spray material may be selected from among yttrium (Y) and Group 3A elements inclusive of lanthanum (La) to lutetium (Lu). Of these, yttrium (Y), gadolinium (Gd) and erbium (Er) are preferred. A mixture of two or more rare earth elements is also acceptable. When such a mixture is used, the spray material may be obtained by agglomerating a mixture of raw materials, or by forming particles of a single element and mixing such particles of different elements prior to use.
- The spray material has an average particle size of 10 μm to 100 μm, preferably 15 μm to 60 μm. As used herein, the average particle size is determined as a weight average value D50 (i.e., a particle diameter or median diameter when the cumulative weight reaches 50%) by a particle size distribution measurement unit based on the laser light diffractometry. If the particle size of spray material is too small, such particles may evaporate in the flame, resulting in a lower yield of spraying. If the size of spray material is too large, such particles may not be completely melted in the flame, resulting in a sprayed coating of deteriorated quality.
- Particles as agglomerated to constitute the spray material should be solid, i.e., filled to the interior (or free of voids), because solid particles are stable (or do not chip or collapse) during handling, and because the problem arising from voids in particles that undesirable gas component can be trapped in voids is avoidable. In this respect, the spray material should have a bulk density of 0.8 g/cm3 to 2 g/cm3, preferably 1.2 g/cm3 to 1.8 g/cm3.
- The atmospheric plasma spraying of rare earth element oxyfluoride has a possibility that the oxyfluoride is decomposed into oxide. Particularly when the spray material (or powder) contains a noticeable amount of water or hydroxyl, it facilitates decomposition of the oxyfluoride into a rare earth element oxide and the liberated fluorine forms a gas such as hydrogen fluoride. The resulting sprayed coating becomes a mixture of rare earth element oxide and rare earth element fluoride. In this regard, the raw material to be agglomerated into the spray powder should preferably have a water or hydroxyl content of up to 10,000 ppm, more preferably up to 5,000 ppm, and even more preferably up to 1,000 ppm.
- The spray material (or powder) contains carbon in a concentration of not more than 0.5% by weight, preferably not more than 0.3% by weight, and more preferably not more than 0.1% by weight. If the carbon content is too high, such carbon can react with oxygen of the rare earth element oxyfluoride to form carbon dioxide, causing decomposition of the rare earth element oxyfluoride. As long as the carbon content is limited low, decomposition of the rare earth element oxyfluoride during thermal spraying is inhibited and a satisfactory coating of rare earth element oxyfluoride is deposited.
- The rare earth element oxyfluoride spray material defined above can be prepared by agglomerating (or granulating) rare earth element oxyfluoride or by mixing rare earth element oxide and rare earth element fluoride and agglomerating the mixture. For example, the spray material is prepared by dispersing a starting powder in a solvent such as water or an alcohol of 1 to 4 carbon atoms to form a slurry having a concentration of 10 to 40% by weight and agglomerating the slurry by spray drying or analogous technique. When rare earth element oxide and rare earth element fluoride are mixed, the mixture may consist of 10 to 70% by weight of rare earth element oxide and the balance of rare earth element fluoride.
- Alternatively, the spray material may be prepared by mixing a rare earth element oxyfluoride with an organic polymer serving as a binder such as carboxymethyl cellulose and deionized water to form a slurry and agglomerating by spray drying or analogous technique. Examples of the binder used herein include polyvinyl alcohol and polyvinyl pyrrolidone as well as carboxymethyl cellulose. The binder is typically added in an amount of 0.05 to 10% by weight based on the weight of the rare earth element oxyfluoride to form a slurry.
- The particles as agglomerated are fired at a temperature of 600° C. to 1600° C. in air, vacuum or an inert gas atmosphere for the purpose of removing the binder and water. Firing in an oxygen-containing atmosphere is preferred for carbon removal.
- By plasma spraying the resulting spray material to a substrate, a rare earth element oxyfluoride-sprayed article is obtainable. The sprayed coating on the substrate should have a carbon content of not more than 0.1% by weight, preferably 0.01 to 0.03% by weight and an oxygen content of 3 to 15% by weight, preferably 5 to 13% by weight.
- Thermal spraying to a component of the semiconductor fabrication equipment is desirably atmospheric plasma spraying or vacuum plasma spraying. The plasma gas used herein may be nitrogen/hydrogen, argon/hydrogen, argon/helium, argon/nitrogen, argon alone, or nitrogen gas alone, but not limited thereto. Examples of the substrate subject to thermal spraying include, but are not limited to, substrates of aluminum, nickel, chromium, zinc, and alloys thereof, alumina, aluminum nitride, silicon nitride, silicon carbide, and quartz glass which constitute components of the semiconductor equipment. The sprayed coating typically has a thickness of 50 to 500 μm. The conditions under which the rare earth element oxyfluoride powder is thermally sprayed are not particularly limited. The thermal spraying conditions may be determined as appropriate depending on the identity of substrate, a particular composition of the rare earth element oxyfluoride spray material, and a particular application of the resulting sprayed article.
- The resulting sprayed article has higher resistance against plasma etching (i.e., corrosion resistance) than sprayed coatings of rare earth element oxide and fluoride. Thus a long lifetime is available.
- Examples are given below by way of illustration and not by way of limitation.
- A spray powder material was obtained by providing a starting powder or mixing ingredients in a predetermined ratio to form a starting powder as shown in Table 1, dispersing the starting powder in a binder (Table 1) to form a slurry, agglomerating in a spray dryer, and firing under selected conditions (Table 1). The resulting spray powder was measured for particle aspect ratio, particle size distribution, bulk density, and oxygen, fluorine and carbon concentrations. The results are shown in Table 1. Notably, the particle size distribution was measured by the laser diffraction method, the fluorine concentration analyzed by dissolution ion chromatography, and the carbon and oxygen concentrations analyzed by the combustion and infrared (IR) spectroscopy method. The aspect ratio of particles was determined by taking a scanning electron microscope (SEM) photo, measuring the length and breadth of 180 particles in the photo, and averaging.
- The spray powder materials in Examples 1 to 4 and Comparative Examples 1 and 2 were air plasma sprayed to aluminum substrates using a gas mixture of 40 L/min of argon and 5 L/min of hydrogen. The resulting articles had a sprayed coating of about 200 μm thick. The sprayed coatings of powder materials in Examples 1 to 4 looked black, whereas the sprayed coatings of powder materials in Comparative Examples 1 and 2 were white. The carbon and oxygen concentrations of each sprayed coating were measured by the combustion and IR method. The results are shown in Table 1.
- Each article was masked with masking tape to define a masked and exposed section before it was mounted on a reactive ion plasma tester. A plasma corrosion test was performed under conditions: frequency 13.56 MHz, plasma power 1,000 watts, gas mixture CF4+O2 (20 vol %), flow rate 50 sccm, gas pressure 50 mTorr, and time 12 hours. At the end of the test, a step formed between the exposed and masked sections due to corrosion. The height of the step was measured at 4 points by a laser microscope and averaged as an index for corrosion resistance. The results are shown in Table 1.
-
TABLE 1 Example Comparative Example 1 2 3 4 1 2 Start powder, particle size Y2O3 15 YOF 100 Gd2O3 30 Er2O3 40 Y2O3 YF3 100 D50 0.3 μm wt % 2.0 wt % 1.1 μm wt % 0.3 μm wt % 1.0 100 2.0 wt % YF3 85 μm GdF3 70 ErF3 60 μm wt % μm 1.8 μm wt % 1.5 μm wt % 2.5 μm wt % Agglomeration Start 30 wt % 20 wt % 25 wt % 35 wt % 35 wt % 25 wt % powder Binder* CMC 12 CMC 8 PVP 8 PVP 5 CMC 10 CMC 5 wt % wt % wt % wt % wt % wt % Firing Atmosphere Air N2 Air Vacuum Air Air Temperature 800° C. 900° C. 900° C. 900° C. 1500° C. 800° C. Time 4 h 3 h 3 h 6 h 15 h 20 h Analysis of Aspect ratio 1.2 1.5 1.3 1.3 1.5 1.5 spray powder D10 26 μm 18 μm 25 μm 30 μm 17 μm 35 μm D50 46 μm 28 μm 48 μm 50 μm 30 μm 57 μm D90 68 μm 48 μm 75 μm 80 μm 46 μm 80 μm Bulk density 1.4 g/cm3 1.3 g/cm3 1.6 g/cm3 1.8 g/cm3 1.6 g/cm3 1.5 g/cm3 Oxygen 4 wt % 13 wt % 4 wt % 5 wt % 21.3 wt % 0.5 wt % Fluorine 31 wt % 16 wt % 2.3 wt % 20 wt % 0 wt % 38 wt % Carbon 0.01 wt % 0.01 wt % 0.01 wt % 0.01 wt % 0.01 wt % 0.01 wt % Analysis of Oxygen 6 wt % 13 wt % 6 wt % 8 wt % 21 wt % 2 wt % sprayed coating Carbon 0.02 wt % 0.01 wt % 0.02 wt % 0.02 wt % 0.05 wt % 0.11 wt % Corrosion resistance, step 3.6 μm 3.7 μm 3.8 μm 4.2 μm 4.7 μm 5.1 μm *Carboxymethyl cellulose, polyvinyl alcohol, and polyvinyl pyrrolidone are abbreviated as CMC, PVA, and PVP, respectively. - As is evident from Table 1, the sprayed coatings obtained from the rare earth element oxyfluoride powder materials in Examples 1 to 4 have higher resistance against plasma etching (corrosion resistance) than the sprayed coatings from the rare earth element oxide and fluoride in Comparative Examples 1 and 2.
- Japanese Patent Application No. 2012-183302 is incorporated herein by reference.
- Although some preferred embodiments have been described, many modifications and variations may be made thereto in light of the above teachings. It is therefore to be understood that the invention may be practiced otherwise than as specifically described without departing from the scope of the appended claims.
Claims (5)
1. A spray material comprising rare earth element oxyfluoride particles having an aspect ratio of up to 2, an average particle size of 10 to 100 μm, and a bulk density of 0.8 to 2 g/cm3, and containing not more than 0.5% by weight of carbon and 3 to 15% by weight of oxygen.
2. The spray material of claim 1 wherein the rare earth element is one or more elements selected from the group consisting of Y and Group 3A elements from La to Lu.
3. The spray material of claim 2 wherein the rare earth element is selected from the group consisting of Y, Gd and Er.
4. The spray material of claim 1 which is obtained by mixing 10 to 70% by weight of rare earth element oxide having an average particle size of 0.01 to 5 μm and the balance of rare earth element fluoride having an average particle size of 0.1 to 5 μm, agglomerating, and firing.
5. A rare earth element oxyfluoride-sprayed article comprising a substrate and a sprayed coating which is deposited on the substrate by plasma spraying the spray material of any one of claims 1 to 4 , the sprayed coating having a carbon content of not more than 0.1% by weight and an oxygen content of 3 to 15% by weight.
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2012
- 2012-08-22 JP JP2012183302A patent/JP5939084B2/en active Active
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2013
- 2013-08-21 KR KR1020130098814A patent/KR20140025287A/en active Application Filing
- 2013-08-21 US US13/971,889 patent/US20140057078A1/en not_active Abandoned
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2015
- 2015-08-24 US US14/833,437 patent/US10435569B2/en active Active
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2019
- 2019-09-05 KR KR1020190110113A patent/KR102066820B1/en active IP Right Grant
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2020
- 2020-03-30 KR KR1020200037988A patent/KR20200039629A/en not_active IP Right Cessation
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2021
- 2021-08-06 KR KR1020210103873A patent/KR20210100577A/en active Application Filing
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2022
- 2022-07-06 KR KR1020220083075A patent/KR20220100839A/en not_active IP Right Cessation
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Also Published As
Publication number | Publication date |
---|---|
KR20190106959A (en) | 2019-09-18 |
KR20240032005A (en) | 2024-03-08 |
KR102066820B1 (en) | 2020-01-15 |
US20150361540A1 (en) | 2015-12-17 |
KR20220100839A (en) | 2022-07-18 |
JP2014040634A (en) | 2014-03-06 |
KR20140025287A (en) | 2014-03-04 |
US10435569B2 (en) | 2019-10-08 |
JP5939084B2 (en) | 2016-06-22 |
KR20210100577A (en) | 2021-08-17 |
KR20200039629A (en) | 2020-04-16 |
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