WO2006134737A1 - 金属酸化物膜、積層体、金属部材並びにその製造方法 - Google Patents
金属酸化物膜、積層体、金属部材並びにその製造方法 Download PDFInfo
- Publication number
- WO2006134737A1 WO2006134737A1 PCT/JP2006/309327 JP2006309327W WO2006134737A1 WO 2006134737 A1 WO2006134737 A1 WO 2006134737A1 JP 2006309327 W JP2006309327 W JP 2006309327W WO 2006134737 A1 WO2006134737 A1 WO 2006134737A1
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- WO
- WIPO (PCT)
- Prior art keywords
- metal
- aluminum
- film
- oxide film
- metal oxide
- Prior art date
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- 239000002184 metal Substances 0.000 title claims abstract description 153
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- 238000000034 method Methods 0.000 title claims abstract description 46
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- WPBNNNQJVZRUHP-UHFFFAOYSA-L manganese(2+);methyl n-[[2-(methoxycarbonylcarbamothioylamino)phenyl]carbamothioyl]carbamate;n-[2-(sulfidocarbothioylamino)ethyl]carbamodithioate Chemical compound [Mn+2].[S-]C(=S)NCCNC([S-])=S.COC(=O)NC(=S)NC1=CC=CC=C1NC(=S)NC(=O)OC WPBNNNQJVZRUHP-UHFFFAOYSA-L 0.000 claims description 8
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- JFCQEDHGNNZCLN-UHFFFAOYSA-N anhydrous glutaric acid Natural products OC(=O)CCCC(O)=O JFCQEDHGNNZCLN-UHFFFAOYSA-N 0.000 description 1
- 239000010407 anodic oxide Substances 0.000 description 1
- ZMFVLYPTTFPBNG-UHFFFAOYSA-N azane;2,3-dihydroxybutanedioic acid Chemical compound [NH4+].OC(=O)C(O)C(O)C([O-])=O ZMFVLYPTTFPBNG-UHFFFAOYSA-N 0.000 description 1
- NGPGDYLVALNKEG-UHFFFAOYSA-N azanium;azane;2,3,4-trihydroxy-4-oxobutanoate Chemical compound [NH4+].[NH4+].[O-]C(=O)C(O)C(O)C([O-])=O NGPGDYLVALNKEG-UHFFFAOYSA-N 0.000 description 1
- ZCLVNIZJEKLGFA-UHFFFAOYSA-H bis(4,5-dioxo-1,3,2-dioxalumolan-2-yl) oxalate Chemical compound [Al+3].[Al+3].[O-]C(=O)C([O-])=O.[O-]C(=O)C([O-])=O.[O-]C(=O)C([O-])=O ZCLVNIZJEKLGFA-UHFFFAOYSA-H 0.000 description 1
- 229910001593 boehmite Inorganic materials 0.000 description 1
- 238000009835 boiling Methods 0.000 description 1
- GDTBXPJZTBHREO-UHFFFAOYSA-N bromine Substances BrBr GDTBXPJZTBHREO-UHFFFAOYSA-N 0.000 description 1
- 229910052794 bromium Inorganic materials 0.000 description 1
- 239000000872 buffer Substances 0.000 description 1
- KDYFGRWQOYBRFD-NUQCWPJISA-N butanedioic acid Chemical compound O[14C](=O)CC[14C](O)=O KDYFGRWQOYBRFD-NUQCWPJISA-N 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 150000001733 carboxylic acid esters Chemical class 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 230000003197 catalytic effect Effects 0.000 description 1
- 150000005678 chain carbonates Chemical class 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- HNEGQIOMVPPMNR-IHWYPQMZSA-N citraconic acid Chemical compound OC(=O)C(/C)=C\C(O)=O HNEGQIOMVPPMNR-IHWYPQMZSA-N 0.000 description 1
- 229940018557 citraconic acid Drugs 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 150000005676 cyclic carbonates Chemical class 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
- 230000002542 deteriorative effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- IEJIGPNLZYLLBP-UHFFFAOYSA-N dimethyl carbonate Chemical compound COC(=O)OC IEJIGPNLZYLLBP-UHFFFAOYSA-N 0.000 description 1
- OREAFAJWWJHCOT-UHFFFAOYSA-N dimethylmalonic acid Chemical compound OC(=O)C(C)(C)C(O)=O OREAFAJWWJHCOT-UHFFFAOYSA-N 0.000 description 1
- 230000008034 disappearance Effects 0.000 description 1
- 238000002845 discoloration Methods 0.000 description 1
- JBTWLSYIZRCDFO-UHFFFAOYSA-N ethyl methyl carbonate Chemical compound CCOC(=O)OC JBTWLSYIZRCDFO-UHFFFAOYSA-N 0.000 description 1
- 238000010304 firing Methods 0.000 description 1
- 235000013305 food Nutrition 0.000 description 1
- 235000019253 formic acid Nutrition 0.000 description 1
- 239000001530 fumaric acid Substances 0.000 description 1
- 235000011187 glycerol Nutrition 0.000 description 1
- FAHBNUUHRFUEAI-UHFFFAOYSA-M hydroxidooxidoaluminium Chemical compound O[Al]=O FAHBNUUHRFUEAI-UHFFFAOYSA-M 0.000 description 1
- WGCNASOHLSPBMP-UHFFFAOYSA-N hydroxyacetaldehyde Natural products OCC=O WGCNASOHLSPBMP-UHFFFAOYSA-N 0.000 description 1
- 238000007654 immersion Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000005468 ion implantation Methods 0.000 description 1
- VZCYOOQTPOCHFL-UPHRSURJSA-N maleic acid Chemical compound OC(=O)\C=C/C(O)=O VZCYOOQTPOCHFL-UPHRSURJSA-N 0.000 description 1
- 239000011976 maleic acid Substances 0.000 description 1
- 230000007257 malfunction Effects 0.000 description 1
- 229910001092 metal group alloy Inorganic materials 0.000 description 1
- 229910021645 metal ion Inorganic materials 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 125000002496 methyl group Chemical group [H]C([H])([H])* 0.000 description 1
- 229940017219 methyl propionate Drugs 0.000 description 1
- LVHBHZANLOWSRM-UHFFFAOYSA-N methylenebutanedioic acid Natural products OC(=O)CC(=C)C(O)=O LVHBHZANLOWSRM-UHFFFAOYSA-N 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 239000003607 modifier Substances 0.000 description 1
- KERBAAIBDHEFDD-UHFFFAOYSA-N n-ethylformamide Chemical compound CCNC=O KERBAAIBDHEFDD-UHFFFAOYSA-N 0.000 description 1
- 230000007935 neutral effect Effects 0.000 description 1
- 229910017604 nitric acid Inorganic materials 0.000 description 1
- QJGQUHMNIGDVPM-UHFFFAOYSA-N nitrogen group Chemical group [N] QJGQUHMNIGDVPM-UHFFFAOYSA-N 0.000 description 1
- 229910000510 noble metal Inorganic materials 0.000 description 1
- 238000010943 off-gassing Methods 0.000 description 1
- 238000005192 partition Methods 0.000 description 1
- WXZMFSXDPGVJKK-UHFFFAOYSA-N pentaerythritol Chemical compound OCC(CO)(CO)CO WXZMFSXDPGVJKK-UHFFFAOYSA-N 0.000 description 1
- 150000003014 phosphoric acid esters Chemical class 0.000 description 1
- NFIYTPYOYDDLGO-UHFFFAOYSA-N phosphoric acid;sodium Chemical compound [Na].OP(O)(O)=O NFIYTPYOYDDLGO-UHFFFAOYSA-N 0.000 description 1
- 229920000573 polyethylene Polymers 0.000 description 1
- 229920001223 polyethylene glycol Polymers 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- BDERNNFJNOPAEC-UHFFFAOYSA-N propan-1-ol Chemical compound CCCO BDERNNFJNOPAEC-UHFFFAOYSA-N 0.000 description 1
- RUOJZAUFBMNUDX-UHFFFAOYSA-N propylene carbonate Chemical compound CC1COC(=O)O1 RUOJZAUFBMNUDX-UHFFFAOYSA-N 0.000 description 1
- 150000003232 pyrogallols Chemical class 0.000 description 1
- 230000008439 repair process Effects 0.000 description 1
- 230000002336 repolarization Effects 0.000 description 1
- 229920002545 silicone oil Polymers 0.000 description 1
- 239000004071 soot Substances 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 239000001384 succinic acid Substances 0.000 description 1
- 150000005846 sugar alcohols Polymers 0.000 description 1
- 230000003746 surface roughness Effects 0.000 description 1
- 229910052714 tellurium Inorganic materials 0.000 description 1
- PORWMNRCUJJQNO-UHFFFAOYSA-N tellurium atom Chemical compound [Te] PORWMNRCUJJQNO-UHFFFAOYSA-N 0.000 description 1
- UWHCKJMYHZGTIT-UHFFFAOYSA-N tetraethylene glycol Chemical compound OCCOCCOCCOCCO UWHCKJMYHZGTIT-UHFFFAOYSA-N 0.000 description 1
- 229910052723 transition metal Inorganic materials 0.000 description 1
- 150000003624 transition metals Chemical class 0.000 description 1
- DQWPFSLDHJDLRL-UHFFFAOYSA-N triethyl phosphate Chemical compound CCOP(=O)(OCC)OCC DQWPFSLDHJDLRL-UHFFFAOYSA-N 0.000 description 1
- WVLBCYQITXONBZ-UHFFFAOYSA-N trimethyl phosphate Chemical compound COP(=O)(OC)OC WVLBCYQITXONBZ-UHFFFAOYSA-N 0.000 description 1
- 229910021642 ultra pure water Inorganic materials 0.000 description 1
- 239000012498 ultrapure water Substances 0.000 description 1
- 238000001771 vacuum deposition Methods 0.000 description 1
- 230000004580 weight loss Effects 0.000 description 1
- 150000003739 xylenols Chemical class 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
- C25D11/00—Electrolytic coating by surface reaction, i.e. forming conversion layers
- C25D11/02—Anodisation
- C25D11/04—Anodisation of aluminium or alloys based thereon
-
- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
- C25D11/00—Electrolytic coating by surface reaction, i.e. forming conversion layers
- C25D11/02—Anodisation
- C25D11/04—Anodisation of aluminium or alloys based thereon
- C25D11/06—Anodisation of aluminium or alloys based thereon characterised by the electrolytes used
-
- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
- C25D11/00—Electrolytic coating by surface reaction, i.e. forming conversion layers
- C25D11/02—Anodisation
- C25D11/04—Anodisation of aluminium or alloys based thereon
- C25D11/18—After-treatment, e.g. pore-sealing
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L21/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
- H01L21/02—Manufacture or treatment of semiconductor devices or of parts thereof
- H01L21/04—Manufacture or treatment of semiconductor devices or of parts thereof the devices having potential barriers, e.g. a PN junction, depletion layer or carrier concentration layer
- H01L21/18—Manufacture or treatment of semiconductor devices or of parts thereof the devices having potential barriers, e.g. a PN junction, depletion layer or carrier concentration layer the devices having semiconductor bodies comprising elements of Group IV of the Periodic Table or AIIIBV compounds with or without impurities, e.g. doping materials
- H01L21/30—Treatment of semiconductor bodies using processes or apparatus not provided for in groups H01L21/20 - H01L21/26
- H01L21/302—Treatment of semiconductor bodies using processes or apparatus not provided for in groups H01L21/20 - H01L21/26 to change their surface-physical characteristics or shape, e.g. etching, polishing, cutting
- H01L21/306—Chemical or electrical treatment, e.g. electrolytic etching
- H01L21/3065—Plasma etching; Reactive-ion etching
-
- 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
- Y10T428/26—Web or sheet containing structurally defined element or component, the element or component having a specified physical dimension
- Y10T428/263—Coating layer not in excess of 5 mils thick or equivalent
- Y10T428/264—Up to 3 mils
- Y10T428/265—1 mil or less
Definitions
- the present invention relates to a metal oxide film and a laminate, a metal member, and a method for producing them.
- the present invention relates to a metal oxide film and laminate suitable for use in a manufacturing apparatus used in a manufacturing process of an electronic device such as a semiconductor or a flat display, a metal member, and a manufacturing method thereof.
- Manufacturing equipment used in the field of manufacturing electronic devices such as semiconductors and flat displays that is, chemical vapor deposition (CVD), physical vapor deposition (PVD), vacuum deposition, sputter deposition, and Vacuum thin film forming equipment used for microwave-excited plasma CVD, plasma etching, reactive ion etching (RIE), and recently developed dry etching equipment used for microwave-excited plasma etching (hereinafter collectively referred to as vacuum equipment)
- CVD chemical vapor deposition
- PVD physical vapor deposition
- sputter deposition vacuum deposition
- Vacuum thin film forming equipment used for microwave-excited plasma CVD plasma etching, reactive ion etching (RIE), and recently developed dry etching equipment used for microwave-excited plasma etching
- vacuum equipment As a structural material that has a surface in contact with corrosive fluids, radicals, and irradiated ions, such as cleaning equipment, firing equipment, and heating equipment, it has recently been replaced with stainless steel and is
- Aluminum belongs to a particularly basic class of practical metals, and it is necessary to form a protective film by appropriate surface treatment for aluminum and metals containing aluminum as a main component.
- anodic acid film made of an anodic acid in an electrolyte has been known for a long time.
- an acidic electrolytic solution usually pH 2 or lower
- a smooth and uniform alumite film having a porous structure can be formed.
- Shikatsuki is also widely used because anodized coatings have corrosion resistance and acidic electrolytes are stable and easy to manage. Aluminium with a porous structure As the surface treatment of structural members, cracks are generated due to the difference in thermal expansion coefficient between the aluminum base material and the alumite film, which are vulnerable to heat (Patent Document 1—Japanese Patent Laid-Open No. 10-130884). This was a cause of corrosion due to exposure of the substrate.
- Patent Document 2-Japanese Patent Publication No. 5-053870 Japanese Patent Publication No. 5-053870
- halogen gas especially chlorine gas, it is also used for etching gas in processing of metal materials in reactive ion etching (RIE), etc., and in the taring process of thin film forming equipment and dry etching equipment. Therefore, it is important to treat the metal surface of equipment members with strong corrosion resistance against chlorine gas.
- porous structure A method of anodizing the barrier structure after forming an alumite film (Patent Document 6—Special 2005-105300) is also proposed. There was a problem with higher costs.
- a surface treatment when a metal containing aluminum as a main component is used as a structural member a metal alloy, various ceramics, a powder material in which a ceramic and a metal or an alloy are combined is melted.
- a thermal spraying method is used (Patent Document 7—Japanese Patent Laid-Open No. Hei 9 069514).
- Patent Document 7 Japanese Patent Laid-Open No. Hei 9 069514.
- an alumite film formed with an acidic electrolyte has a problem of residual / adsorbed moisture.
- the anodized film has a water-containing structure ⁇ 1203 / 6 ⁇ 20, and the film is etched and porous by the ⁇ ions generated by the electrolysis of the chemical conversion solution, so it contains a large amount of water.
- a large amount of moisture is released into the chamber during the etching process to form water plasma. Since this water plasma generates soot radicals and decomposes the photoresist, the selectivity ratio between the resist and the material to be etched is greatly reduced. Therefore, in conventional RIE, the resist must be formed thick. That causes a loss of resolution and problems!
- a large amount of moisture released into the chamber causes the ions in the chamber to agglomerate by a gas phase reaction, generating a large amount of dust in the chamber, leading to deterioration in device yield.
- RIE etching is usually performed at 20 to 40 millitorr, so the gas molecular interval should be sufficiently wide and no gas phase reaction should occur and no dust should be generated.
- a large amount of dust is generated and dust adheres to the gate valve.
- wafers are taken in and out, dust adheres to the wafer and generates defective products. This is due to moisture It is to do.
- an object of the present invention is to protect a metal containing aluminum as a main component, to prevent a film defect such as micropores and pores (pores) and to reduce moisture release! /, A metal oxide film, and It is to provide the manufacturing method.
- Another object of the present invention is to provide a metal member having a metal oxide film without a film defect such as fine pores (pores), which can protect a metal mainly composed of aluminum, and a production thereof. Is to provide a method.
- Another object of the present invention is to provide a heat treatment that can protect a metal mainly composed of aluminum, has no film defects such as fine pores (pores), has a low moisture release, and is 150 ° C. or higher. It is another object of the present invention to provide a metal member having a metal oxide film that does not generate cracks and a method for manufacturing the metal member.
- the present inventors have intensively studied to achieve the above object.
- the metal oxide film which is a thin film and the amount of moisture released from the film is not more than a predetermined amount, suppresses generation of cracks in the oxide film due to heating, release of outgas, etc.
- a metal oxide film having excellent properties can be obtained by using a specific chemical conversion liquid and having good corrosion resistance especially against chlorine gas.
- a film that also has an acid strength of a metal mainly composed of aluminum has a film thickness of lOnm or more, and the amount of water released from the film is 1E18 molecule Zcm 2
- a metal oxide film characterized by the following (1 ⁇ 10 18 pieces / cm 2 or less) is obtained. In the following description, the number of molecules is expressed using E-notation.
- a metal oxide film formed by using a specific chemical conversion liquid in a metal mainly composed of aluminum, in which the content of some elements is suppressed, has voids and gas pools. It was found that it has good corrosion resistance against chemicals such as nitric acid and hydrofluoric acid and halogen gas, especially chlorine gas, by preventing the formation of cracks in the oxide film by heating.
- the thickness of the metal oxide film can be measured with a transmission electron microscope or a scanning electron microscope. For example, JEOL Co., Ltd. Heng SM-6700 can be used.
- the amount of water released from the metal oxide film is determined while the metal oxide film is kept at 23 ° C for 10 hours and then heated to 200 ° C for 2 hours. This is the number of water molecules released per unit area [molecule Zcm 2 ] released from (including during the temperature rise time).
- the amount of water released can be measured using, for example, an atmospheric pressure ionization mass spectrometer (UG-302P manufactured by Renesas East Japan).
- the metal oxide film is obtained by anodizing a metal containing aluminum as a main component or a metal containing high-purity aluminum as a main component in a chemical conversion solution of PH4 to LO.
- the chemical liquid preferably contains at least one selected from the group power consisting of boric acid, phosphoric acid, organic carboxylic acid and salts thereof.
- the composition liquid contains a non-aqueous solvent.
- This metal oxide film is desirably used as a film for protecting a structural material of a semiconductor or flat display manufacturing apparatus.
- a laminate comprising the metal oxide film on a base made of a metal mainly composed of aluminum or a metal mainly composed of high-purity aluminum. Is obtained.
- This laminate is desirably used as a structural material for a semiconductor or flat display manufacturing apparatus.
- a multi-layer structure can be formed by further forming a thin film using one or more of materials selected from metals, cermets and ceramic forces on a metal oxide film.
- a metal containing aluminum as a main component or a metal containing high-purity aluminum as a main component is anodized in a chemical solution of PH4 ⁇ : LO so that the main component is aluminum.
- a metal oxide film manufacturing method characterized in that a film made of a metal oxide or a metal oxide mainly composed of high-purity aluminum is obtained.
- the chemical conversion liquid preferably contains at least one selected from the group consisting of boric acid, phosphoric acid, organic carboxylic acid, and salts thereof. Moreover, it is preferable that a chemical conversion liquid contains a non-aqueous solvent.
- the metal oxide film is preferably heat-treated at 150 ° C or higher after anodic oxidation.
- the thickness of the obtained metal oxide is lOnm or more, and the amount of water released from the film is 1E18 molecule Zcm 2 or less.
- This released moisture is derived from the water adsorbed on the surface of the metal oxide film, and the amount of released water is proportional to the effective surface area of the metal oxide film. Therefore, to reduce the amount of released water, minimize the effective surface area. For this reason, it is desirable that the metal oxide film is a barrier type metal oxide film having no pores on the surface. These metal oxide films are used as protective films for structural materials of semiconductors or flat display manufacturing equipment.
- a substrate made of a metal force mainly composed of aluminum was anodized in a chemical conversion solution in P H4 ⁇ 1 0, the metal mainly composed of aluminum on the substrate Sani
- a method for producing a laminate is obtained, which is characterized by forming a film made of a material.
- the metal containing aluminum as a main component means a metal containing 50 mass% or more of aluminum. Pure aluminum may be used. Preferably, the metal contains 80% by weight or more of aluminum, more preferably 90% by weight or more, and still more preferably 94% by weight or more of aluminum.
- the metal containing aluminum as a main component preferably contains at least one metal selected from the group consisting of magnesium, titanium, and zinc.
- the metal having high-purity aluminum as a main component is a metal having aluminum as a main component, and the total content of specific elements (iron, copper, manganese, zinc, chromium) is 1% or less.
- the metal mainly composed of high-purity aluminum preferably contains at least one metal selected from the group consisting of magnesium, titanium and zirconium.
- a defect-free noria-type metal having a main component of aluminum or a metal having a high purity aluminum as a main component and a laminate having the same without a micropore or a pore are provided. It exhibits good corrosion resistance against chemicals and corrosive fluids, especially halogen gases such as chlorine gas, and is free of hydrogen radicals, oxygen radicals, chlorine radicals, bromine radicals, and fluorine radicals. It has complete resistance to all radicals such as dical and ion irradiation in plasma.
- the metal oxide film is hard to crack, so that the generation of particles and corrosion due to the exposure of the aluminum substrate are suppressed, and the thermal stability is increased. There is little outgas emission.
- a protective film for structural materials such as the inner wall of a vacuum device such as a vacuum thin film forming device, it improves the ultimate vacuum of the device and improves the quality of the thin film produced. It also leads to reduction of defects.
- the process is stable because it provides a surface that does not react radically.
- alumite when conventional alumite-protected aluminum is used in the plasma processing equipment, alumite has a thick film and a large wall capacitance, so a large amount of charge is attached and the plasma disappears due to recombination of ions and electrons.
- the film thickness of the aluminum oxide film of the present invention is small, the capacitance is small and the plasma disappearance due to charge recombination is also small.
- Conventional 1Z5 to 1Z10 can be used.
- the RIE system can capture a large selection ratio because the photoresist that does not generate water plasma is not damaged, so that the resist can be thinned. This can lead to a dramatic increase. Further, the generation of dust is suppressed and the yield is improved.
- a metal oxide mainly composed of high-purity aluminum can appropriately suppress the formation of voids and the formation of gas reservoirs in the NORA structure.
- FIG. 1 is a graph showing voltage characteristics during anodic oxidation in Example 4 and Example 5.
- FIG. 2 is a graph showing the water release characteristics of each sample of Example 3 and Comparative Example 1 and an untreated aluminum sample piece.
- FIG. 3 is an electron micrograph of the sample surface after annealing in Example 3, Example 6, Comparative Example 1 and Comparative Example 3.
- FIG. 4 shows the chlorine gas exposure evaluation in Example 8, Example 10, Comparative Example 4, and Comparative Example 5. It is an electron micrograph of the sample surface after valence.
- FIG. 5 is an electron micrograph of the sample surface after evaluation of chlorine gas exposure in Examples 8 to: LO and Comparative Example 6.
- FIG. 6 is a graph showing current characteristics during anodization in Examples 14 to 16 and Reference Example 1.
- FIG. 7 is a graph showing voltage characteristics during anodization in Example 21 and Reference Example 6.
- FIG. 8 is an electron micrograph of the surface of each sample of the high-purity aluminum material and the A5052 material after immersion in the chemical solution in Example 30.
- FIG. 9 is a photograph of the surface of each sample of high-purity aluminum material and A 5052 material after evaluation of chlorine gas exposure in Example 33.
- Figure 10 shows the characteristics of pure A1 and various A1 alloys shown in Table 11 when anodized with a nonaqueous electrolyte solution containing lwt% ammonium adipate.
- 10 (a) is a graph showing voltage characteristics
- FIG. 10 (b) is a graph showing current characteristics.
- FIG. 11 is a graph showing residual current densities of various aluminum alloys formed with a nonaqueous elec- trolyte solution containing lwt% ammonium adipate.
- FIG. 12 shows the anodic oxidation of non-aqueous electrolyte solution containing lwt% ammonium adipate for high-purity A1 containing a small amount of Mg and Zr whose yarns are shown in Table 12.
- FIG. 12 (a) is a graph showing voltage characteristics
- FIG. 12 (b) is a graph showing current characteristics.
- FIG. 13 shows the reanodized acid curve of an anodized aluminum alloy after annealing at 573 (K) with respect to the reanodized acid film for evaluating the annealed acid film.
- FIG. 13 (a) Fig. 13 (b) is a graph showing the voltage and current characteristics, respectively.
- FIG. 14 is a graph showing residual current values before and after annealing / reoxidation.
- FIG. 15 is a graph showing the relationship between the voltage and the oxide film thickness in anodic oxidation.
- FIG. 16 is a graph showing the relationship between the anodic oxidation voltage and the specific resistance of the oxide film.
- Figures 17 (a), 17 (b), and 17 (c) show an A1 Mg2 sample annealed at 300 ° C for 1 hour after anodization, respectively, in ammonia gas, chlorine gas, and HBr gas at 200 ° C.
- D This is an electron micrograph showing alumite exposed to chlorine gas at 100 ° C.
- FIG. 18 is a graph showing the result of exposing an AlMg2 sample annealed at 300 ° C. for 1 hour after anodic oxidation to irradiated ions.
- FIG. 19 shows the results when 0.1% by mass of Zr was added to high-purity A1 (total impurity content of lOOppm or less) containing 1.5% by mass and 2% by mass of Mg.
- FIG. 6 is a diagram showing the growth of A1 crystal grains when no cracking occurs.
- a metal oxide film according to the present invention is a film that also has an acid strength of a metal mainly composed of aluminum or a metal mainly composed of high-purity aluminum. Is 1Onm or more, and the amount of water released from the membrane is 1E18 molecule Zcm 2 or less.
- this film When this film is formed on a substrate made of a metal containing aluminum as a main component, it exhibits high performance as a protective film.
- the thickness of the metal oxide film is preferably as thin as 100 m or less. When the film thickness is thick, cracks are generated and outgas is easily released. More preferably, it is 10 m or less, more preferably 1 ⁇ m or less, particularly preferably 0.8 ⁇ m or less, and particularly preferably 0.6 ⁇ m or less. However, the film thickness should be at least lOnm. If the film thickness is too thin, sufficient corrosion resistance cannot be obtained. Preferably it is 20 nm or more, more preferably 30 nm or more.
- the amount of water released from the metal oxide film is 1E18 molecule Zcm 2 or less. If the amount of released water is large, the moisture becomes a source of corrosion, and when used as a protective film for a structural material such as an inner wall of a vacuum device, the quality of the manufactured thin film is deteriorated. Preferably it is 2E17 molecule Zcm 2 or less, more preferably 1E17 molecule Zcm 2 or less. The amount of water released is preferably small, but is usually 1.5E15 molecules Zcm 2 or more.
- a barrier metal oxide film such as a fine pore or a pore
- the barrier type metal oxide film is thin but excellent in corrosion resistance and has almost no fine pores! /, Therefore, it is difficult to adsorb moisture etc.!
- the metal oxide film of the present invention also has an acid strength of a metal mainly composed of aluminum.
- the metal mainly composed of lumium is a metal containing 50% by mass or more of aluminum. Pure aluminum may be used.
- the metal comprises aluminum 80 mass 0/0 or more, good Ri preferably aluminum 90 mass% or more, even more preferably more than 94 wt%.
- the metal mainly composed of aluminum may be pure aluminum, but it may contain any other metal that can form an alloy with aluminum if necessary. Also good.
- the type of metal is not particularly limited, but preferred metals include at least one metal selected from the group force consisting of magnesium, titanium and zirconium. Of these, magnesium is particularly preferred because it has the advantage of improving the strength of the aluminum substrate.
- the metal oxide film of the present invention is a high-purity aluminum which is a metal containing aluminum as a main component and in which the content of a specific element (iron, copper, manganese, zinc, chromium) is suppressed. It is made of a metal oxide whose main component is.
- the total content of these characteristic elements is preferably 1.0% by mass or less, more preferably 0.5% by mass or less, and still more preferably 0.3% by mass or less.
- the metal mainly composed of high-purity aluminum may be pure aluminum, but may contain any other metal capable of forming an alloy with aluminum as required. good.
- the type of metal is not particularly limited as long as it is other than the above-mentioned specific element, but preferable metals include at least one metal selected from the group consisting of magnesium, titanium, and zirconium.
- magnesium is particularly preferred because it has the advantage of improving the strength of the aluminum substrate.
- the magnesium concentration is not particularly limited as long as it can form an alloy with aluminum, but is usually 0.5% by mass or more, preferably 1.0% by mass or more, in order to provide sufficient strength improvement. More preferably 1.5% by mass or more. In order to form a uniform solid solution with aluminum, it is preferably 6.5% by mass or less, more preferably 5.0% by mass, still more preferably 4.5% by mass or less, and most preferably 3% by mass. % Or less.
- the metal of the present invention mainly containing aluminum or the metal mainly containing high-purity aluminum may contain other metal components as a crystal modifier. There is no particular limitation as long as it has a sufficient effect on crystal control, but zirconium or the like is preferably used.
- the content thereof is a metal mainly composed of aluminum or It is usually 0.01% by mass or more, preferably 0.05% by mass or more, more preferably 0.1% by mass or more, based on the entire metal mainly composed of high-purity aluminum. This is to fully develop the characteristics of other added metals. However, it is usually 20% by mass or less, preferably 10% by mass or less, more preferably 6% by mass or less, particularly preferably 4.5% by mass or less, and most preferably 3% by mass or less. Aluminum and other metal components form a uniform solid solution and are less desirable to maintain good material properties.
- an aluminum oxide passivation film is provided on a surface of a metal member mainly composed of aluminum and in contact with at least one of a corrosive fluid, a radical, and irradiation ions.
- the aluminum oxide passivation film is a nonporous amorphous film having a thickness force of O. 1 ⁇ m or more and 1 ⁇ m or less and a specific resistance of 1 ⁇ 10 ⁇ ′cm or more.
- the metal member to be obtained is obtained.
- Ordinary alumite cannot have a resistivity of 1-10 ⁇ 'cm or more, but the aluminum oxide passivation film of the present invention has a resistivity of 0.1 ⁇ m or more and 1 ⁇ m or less.
- the aluminum oxide passivating film is characterized in that the amount of released water is 1E18 molecule Zcm 2 or less.
- the metal containing aluminum as a main component contains 50% by mass or more of aluminum and 1 to 4.5% by mass of magnesium.
- magnesium When magnesium is contained, it has the effect of improving mechanical strength and becomes resistant to heat, so it can withstand heat treatment at 150 ° C or higher and 500 ° C after anodizing. If heat treatment can be omitted by lowering the current value, there is no need to add magnesium.
- the metal containing aluminum as a main component preferably contains 0.15% by mass or less, preferably 0.1% by mass or less of zirconium. As a result, the mechanical strength and heat resistance can be further increased.
- the metal member of the present invention preferably has a total content of elements other than aluminum, magnesium and zirconium of 1% by mass or less. Further, it is preferable that the content of any of these elements excluding aluminum, magnesium and zirconium is 0.01% by mass or less. If these impurity elements exceed the above content, oxygen is generated in the oxide film, resulting in voids and cracking in the anneal. In addition, the residual current of the film will increase.
- the metal member of the present invention is preferably used in various devices used in the manufacturing process of an electronic device, particularly in a portion in contact with at least one of a corrosive fluid, a radical, and irradiation ions.
- a dense and pore-free noria-type metal acid According to the method of anodizing a metal containing aluminum as a main component or a metal containing high-purity aluminum as a main component in a chemical solution of P H 4 ⁇ : LO, a dense and pore-free noria-type metal acid There is an advantage that a film can be obtained.
- a substrate composed of aluminum as a main component is also anodized in a pH 4 to 10 chemical conversion solution with a metallic force as a main component, so that the surface of the substrate is made of a metal oxide mainly composed of aluminum. Is formed.
- the chemical conversion solution used in the present invention is usually pH 4 or higher, preferably 5 or higher, more preferably 6 or higher. Also, it is usually 10 or less, preferably 9 or less, more preferably 8 or less. It is desirable that the pH be close to neutral so that the metal oxide film produced by anodic oxidation is difficult to dissolve in the chemical conversion solution.
- the chemical conversion solution used in the present invention preferably exhibits a buffering action in the range of pH 4 to 10 in order to buffer the concentration fluctuations of various substances during chemical conversion and maintain the pH within a predetermined range.
- a compound such as an acid or salt exhibiting a buffering action.
- the type of such a compound is not particularly limited, but is preferably at least one selected from the group consisting of boric acid, phosphoric acid, organic carboxylic acid, and salts thereof, because it has high solubility in the chemical conversion solution and good dissolution stability. is there. More preferably, it is an organic carboxylic acid or a salt thereof in which boron and phosphorus elements hardly remain in the metal oxide film.
- solute component is taken into the metal oxide film produced by the anodizing treatment, it was applied to a vacuum thin film forming apparatus or the like by using an organic carboxylic acid or a salt thereof as the solute. At this time, there is no possibility of boron and phosphorus elements eluting from the metal oxide film, and this is a force that can be expected to stabilize and improve the quality of the formed thin film and the performance of devices using the thin film.
- Any organic carboxylic acid may be used as long as it has one or more carboxyl groups. As long as the desired effect of the invention is not inhibited, it may have a functional group other than a carboxyl group.
- formic acid can also be preferably used.
- aliphatic carboxylic acids aliphatic dicarboxylic acids having 3 to 10 carbon atoms are preferred from the viewpoint of high solubility in the chemical conversion solution and good dissolution stability.
- aliphatic dicarboxylic acid examples include, but are not limited to, malonic acid, maleic acid, fumaric acid, succinic acid, tartaric acid, itaconic acid, glutaric acid, dimethylmalonic acid, citraconic acid, citrate, adipic acid, heptanoic acid , Pimelic acid, suberic acid, azelaic acid, sebacic acid and the like.
- malonic acid maleic acid, fumaric acid, succinic acid, tartaric acid, itaconic acid, glutaric acid, dimethylmalonic acid, citraconic acid, citrate, adipic acid, heptanoic acid , Pimelic acid, suberic acid, azelaic acid, sebacic acid and the like.
- tartaric acid, citrate, and adipic acid are particularly preferred for reasons such as solution stability, safety, and good buffer action. Use one of these, or use a combination of two or more.
- the salt of boric acid, phosphoric acid and organic carboxylic acid may be a salt of these acids with an appropriate cation.
- the cation is not particularly limited, but for example, ammonium ion, primary, secondary, tertiary or quaternary alkyl ammonium ion, alkali metal ion, phosphonium ion, or sulfo-ion ion may be used. it can.
- ammonia ions, primary, secondary, tertiary, or quaternary alkyl ammonium ions are preferred because they are less affected by residual metal ions on the surface due to diffusion to the substrate metal.
- the alkyl group of the alkyl ammonium ion may be appropriately selected in consideration of solubility in the chemical conversion solution, but is usually an alkyl group having 1 to 4 carbon atoms.
- the concentration of these compounds may be appropriately selected according to the purpose, but is usually 0.01% by mass or more, preferably 0.1% by mass or more, more preferably 1%, based on the entire chemical conversion liquid. Mass% or more. In order to increase the electrical conductivity and to sufficiently form the metal oxide film, it is desirable to increase it. However, it is usually 30% by mass or less, preferably 15% by mass or less, and more preferably 10% by mass or less. In order to keep the performance of the metal oxide film high and to reduce costs, this is desirable.
- the chemical conversion liquid used in the present invention preferably contains a non-aqueous solvent.
- the use of a chemical conversion solution containing a non-aqueous solvent has the advantage that it can be processed at a high throughput because the time required for constant current formation is shorter than that of an aqueous chemical conversion solution.
- the type of the non-aqueous solvent is not particularly limited as long as it can form an anodic acid satisfactorily and has sufficient solubility in a solute, but one or more alcoholic hydroxyl groups and Z or one or more phenols.
- a solvent having a protic hydroxyl group or an aprotic organic solvent is preferred. Of these, a solvent having an alcoholic hydroxyl group is preferred in terms of storage stability.
- Examples of the compound having an alcoholic hydroxyl group include monohydric alcohols such as methanol, ethanol, propanol, isopropanol, 1-butanol, 2-ethynole, monohexanol, and hexanol; ethylene Dihydric alcohols such as glycol, propylene glycol, butane-1,4-diol, diethylene glycol, triethylene glycol, and tetraethylene glycol; trihydric or higher polyhydric alcohols such as glycerin and pentaerythritol can be used.
- a solvent having a functional group other than an alcoholic hydroxyl group in the molecule can also be used as long as the desired effect of the present invention is not impaired.
- those having two or more alcoholic hydroxyl groups are preferred in view of miscibility with water and vapor pressure.
- Particularly preferred are ethylene glycol, propylene glycol, and diethylene glycol.
- Dihydric alcohol and trihydric alcohol are more preferred. I like it.
- Examples of the compound having a phenolic hydroxyl group include unsubstituted phenol having one hydroxyl group, alkylphenols such as o-Zm-Zp talesols and xylenols, and two hydroxyl groups. Resorcinols can be used, and pyrogallols can be used as those having three hydroxyl groups.
- the compound having an alcoholic hydroxyl group and Z or a phenolic hydroxyl group may further have another functional group in the molecule as long as the desired effect of the present invention is not inhibited.
- a solvent having an alcoholic hydroxyl group as well as an alcohol group such as methyl mouth solve and mouth solve can also be used.
- aprotic organic solvent either a polar solvent or a nonpolar solvent may be used.
- the polar solvent is not particularly limited, but examples thereof include cyclic carboxylic acid esters such as ⁇ -petit-mouth rataton, ⁇ -valero rataton, and ⁇ -valerolataton; chains such as methyl acetate, ethyl acetate, and methyl propionate.
- -Like carboxylic acid esters cyclic carbonates such as ethylene carbonate, propylene carbonate, butylene carbonate, and beylene carbonate Tellurium; chain carbonates such as dimethyl carbonate, ethylmethyl carbonate, and jetyl carbonate, N-methylformamide, N-ethylformamide, N, N-dimethylformamide, N, N-jetylformamide, N — Amides such as methylacetamide, N, N-dimethylacetamide, N-methylpyrrolidone, acetonitrile, glutathiol-tolyl, adipo-tolyl, methoxyacetonitrile, 3-methoxypropio-tolyl, etc.
- Phosphate esters such as trimethyl phosphate and triethyl phosphate.
- the nonpolar solvent is not particularly limited, and examples thereof include hexane, toluene, and silicone oil.
- non-aqueous solvent for the chemical conversion liquid used for forming the metal oxide film of the present invention is ethylene glycol, propylene glycol, or diethylene glycol, which may be used alone or in combination. Moreover, as long as it contains a non-aqueous solvent, it may contain water.
- the non-aqueous solvent is usually contained in an amount of 10% by mass or more, preferably 30% by mass or more, more preferably 50% by mass or more, and particularly preferably 55% by mass or more based on the entire chemical conversion liquid. However, it is usually 95% by mass or less, preferably 90% by mass or less, particularly preferably 85% by mass or less.
- the content thereof is usually 1% by mass or more, preferably 5% by mass or more, more preferably 10% by mass or more, particularly with respect to the total chemical conversion liquid.
- the amount is preferably 15% by mass or more, usually 85% by mass or less, preferably 50% by mass or less, and particularly preferably 40% by mass or less.
- the ratio of water to the non-aqueous solvent is preferably 1% by mass or more, preferably 5% by mass or more, more preferably 7% by mass or more, particularly preferably 10% by mass or more, and usually 90% by mass or less. Preferably it is 60 mass% or less, More preferably, it is 50 mass% or less, Most preferably, it is 40 mass% or less.
- the chemical conversion liquid according to the present invention may contain other additives as necessary.
- an additive for improving the film formability and film characteristics of the metal oxide film may be contained.
- the additive is not particularly limited as long as it does not significantly impair the intended effect of the present invention.
- One or more additives selected from known additives and other substances are used. Substances can be added and used. At this time, there is no particular limitation on the amount of additive added, and the amount may be set appropriately in consideration of its effect and cost.
- the electrolytic method for anodic acid is not particularly limited as long as the intended effect of the present invention is not significantly impaired.
- the current waveform for example, in addition to direct current, a pulse method in which the applied voltage is periodically interrupted, a PR method in which the polarity is reversed, other alternating current, AC / DC superimposition, incomplete rectification, modulation current such as a triangular wave, etc. can be used.
- DC is preferably used.
- the method for controlling the current and voltage of anodic oxidation is not particularly limited, and the conditions under which an oxide film is formed on the surface of a metal mainly composed of aluminum can be appropriately combined.
- the current density in order to efficiently formed oxide film, current density, and usually 0. OOlmAZcm 2 than on, preferably 0. OlmAZcm 2 or more.
- the current density is usually lOOmAZcm 2 or less, preferably lOmAZcm 2 or less.
- the formation voltage Vf is usually 3 V or more, preferably 10 V or more, more preferably 20 V or more. Since the obtained oxide film thickness is related to the conversion voltage Vf, it is preferable to apply a voltage equal to or higher than the above voltage in order to give the oxide film a certain thickness. However, it is usually below 1000V, preferably below 700V, more preferably below 500V. Since the obtained oxide film has a high insulating property, it is preferable to carry out at a voltage lower than the above voltage in order to form a high-quality oxide film without causing a high dielectric breakdown.
- an alternating current with a constant peak current value is used instead of the direct current power source until the formation voltage is reached, and a method of switching to the direct current voltage and holding for a certain time when the formation voltage is reached is used.
- the temperature during the anodic oxidation should be in the temperature range where the chemical conversion liquid exists stably as a liquid. Usually, it is 20 ° C or higher, preferably 5 ° C or higher, more preferably 10 ° C or higher.
- Manufacture Considering production and energy efficiency at the time of processing, it is preferable to process at the above temperature or higher. However, it is usually 150 ° C or lower, preferably 100 ° C or lower, more preferably 80 ° C or lower. In order to perform uniform anodic oxidation while maintaining the composition of the chemical conversion solution, it is preferable to perform the treatment at the temperature or lower.
- a dense and pore-free noria-type metal oxide film can be efficiently produced by the anodic oxidation method, so that the withstand voltage is high and cracking by annealing treatment is performed.
- the withstand voltage of the film is high, it is suitable as a protective film on the surface of a metal substrate, such as a protective film for structural materials such as the inner wall of a vacuum thin film forming apparatus.
- this metal oxide film can also function as an impurity barrier film and an anticorrosive film.
- a metallic member mainly composed of aluminum is anodized in a chemical conversion liquid containing an organic solvent having a dielectric constant smaller than that of water and dissolving water, and is nonporous.
- a method for producing a metal member characterized by forming an amorphous aluminum oxide passivation film is obtained.
- Water has a dielectric constant of about 80.
- the binding energy of a force substance is inversely proportional to the square of the dielectric constant, so in a HF solution with a higher dielectric constant, such as 83, water will dissociate even at 0 ° C.
- a nonporous amorphous film aluminum oxalate passivation film can be formed.
- organic solvents ethylene glycol has a dielectric constant of 39, diethylene glycol has a dielectric constant of 33, triethylene glycol has a dielectric constant of 24, and tetraethylenedaricol has a dielectric constant of 20. Therefore, when these organic solvents are used, the dielectric constant can be effectively lowered and a high voltage can be applied without causing electrolysis of water.
- an anodizing voltage of up to 20 OV can be applied without causing electrolysis of water, and a 0.3 m thick nonporous amorphous aluminum oxide passivation film.
- Diethylene glycol can be used to apply an anodic acid voltage of up to 300 V without causing electrolysis of water, forming a 0.4 m thick nonporous amorphous aluminum oxide passivation film. can do.
- An electrolyte that makes the chemical conversion liquid electrically conductive is added to the chemical conversion liquid. If the liquid composition becomes acidic, the aluminum member will be corroded. Therefore, an electrolyte that can prevent corrosion of aluminum, such as adipate, is used with pH power of ⁇ 10, preferably 5.5 to 8.5, more preferably 6 to 8 while increasing the electrical conductivity of the chemical liquid.
- the Its content is 0.1 to 10% by mass, preferably about 1%. In a typical example, a chemical conversion solution of 79% organic solvent, 20% water and 1% electrolyte is used.
- the anodic oxidation is performed by a first step of disposing the metal member and a counter electrode (for example, platinum) in the chemical conversion liquid, and applying a plus to the metal member and a minus to the electrode.
- the method includes a second step in which a current is allowed to flow for a predetermined time, and a third step in which a constant voltage is applied between the metal member and the electrode for a predetermined time.
- the voltage between the metal member and the predetermined electrode is good for the predetermined time before the second step. It is preferable that it is until a predetermined value is reached (for example, 200 V when ethylene glycol is used).
- the predetermined time of the third step is preferably until the current between the metal member and the predetermined electrode reaches a predetermined value, but the current value is the voltage at the predetermined value. It will decrease rapidly and then gradually decrease with time. The smaller the residual current, the better the film quality of the oxide film. However, for example, if a constant voltage treatment is performed for 24 hours, the film quality will be equivalent to that after heat treatment. In order to increase productivity, the constant voltage treatment should be stopped and heat treatment (annealing) performed at an appropriate time. The heat treatment is preferably performed at 150 ° C. or higher and about 300 ° C. for 0.5 to 1 hour.
- a current of 0.01 to 100 mA per square cm, preferably 0.1 to: LOmA, more preferably 0.5 to 2 mA is applied.
- the voltage is set such that the chemical conversion solution does not cause electrolysis! /.
- the thickness of the nonporous amorphous film aluminum oxide passivation film depends on the voltage in the third step.
- the excellent effect of the present invention as described above is that the pore-free metal oxide film formed during the chemical conversion treatment has an amorphous structure as a whole. It is thought that this is because there are almost no grain boundaries such as crystals. Further, by adding a compound having a buffering action or using a non-aqueous solvent as a solvent. A trace amount of carbon component is taken into the metal oxide film and the bonding strength of Al—O is weakened. It is presumed that the amorphous structure of the entire film is stabilized.
- the metal oxide film produced as described above may be subjected to heat treatment for the purpose of removing moisture in the film.
- Metal oxide films with a conventional porous structure may crack or crack even when annealing at 150 to 200 ° C, and heat treatment at high temperatures cannot be performed and sufficient moisture removal cannot be performed. This was also the reason why the amount of outgas emissions could not be reduced. Since the metal oxide film according to the present invention is a dense and pore-free barrier type film, it is possible to suppress the occurrence of cracks and cracks in the annealing process, and to reduce the amount of outgas emitted from the film. is there.
- a metal oxide film mainly composed of high-purity aluminum containing substantially no specific element has higher thermal stability than a metal oxide film mainly composed of an aluminum alloy. Void gas reservoirs are not easily formed. For this reason, even if annealing at about 300 ° C or higher, voids will not enter the metal oxide film! /, So corrosion due to generation of particles and exposure of the aluminum substrate to chemicals and halogen gas, especially chlorine gas And the outgas emission from the membrane is further reduced.
- the heat treatment method is not particularly limited, but annealing in a heating furnace or the like is simple and preferable.
- the temperature of the heat treatment is not particularly limited as long as it does not hinder the intended effect of the present invention, but is usually 100 ° C or higher, preferably 200 ° C or higher, more preferably 250 ° C or higher. It is.
- the set temperature of the heating furnace is generally regarded as the heat treatment temperature.
- the time for the heat treatment is not particularly limited as long as the desired effect of the present invention is not hindered, but may be appropriately set in consideration of the intended effect, surface roughness due to the heat treatment, productivity, and the like. Usually, it is 1 minute or longer, preferably 5 minutes or longer, particularly preferably 15 minutes or longer. In order to sufficiently remove the moisture on the surface and inside of the metal oxide film, the treatment should be performed for the above time or more. preferable. However, it is usually 180 minutes or less, preferably 120 minutes or less, more preferably 60 minutes or less. In order to maintain the metal oxide film structure and the surface flatness, it is preferable to perform the treatment within the above time.
- the gas atmosphere in the furnace during the annealing treatment is not particularly limited as long as the effect of the treatment of the present invention is not hindered.
- nitrogen, oxygen, or a mixed gas thereof can be appropriately used.
- an atmosphere with an oxygen concentration of 18 vol% or more is preferred.
- a condition with 20 vol% or more is preferred.
- a condition with a preferred oxygen concentration of 100 vol% is most preferred.
- a laminate formed by forming the metal oxide film of the present invention on a substrate made of a metal containing aluminum as a main component or a metal containing high-purity aluminum as a main component to form a protective film is a chemical gas, particularly a halogen gas. Good corrosion resistance to chlorine gas. Further, since the metal oxide film is not easily cracked even when heated, moisture in the film can be sufficiently removed by annealing or the like, and release of outgas from the film can be suppressed. In general, corrosion of aluminum by chlorine gas requires the three elements of oxidizer, chlorine ion and water. Since chlorine gas itself is an oxidizer and can also be a source of chlorine ions, water is present.
- the amount of water released as outgas from the metal oxide film of the present invention is extremely small, so that corrosion of aluminum can be suppressed.
- the generation of partition due to cracks and corrosion due to exposure of the aluminum substrate at the cracks can be suppressed.
- another layer may be provided on the upper and lower sides of the metal oxide film of the present invention as necessary. Since the metal oxide film of the present invention is as thin as 1 ⁇ m or less, it is preferable to have a laminated film structure of two or more layers in order to reinforce physical and mechanical strength.
- a multilayer structure can be formed by further forming a thin film using one or more of materials selected from metals, cermets and ceramics as raw materials.
- the metal includes one kind of single metal and an alloy composed of two or more elements, and the kind is not particularly limited, but transition metals are preferably used in consideration of strength, corrosion resistance and the like.
- any method can be used as long as it does not hinder the intended effect of the present invention.
- a thermal spraying method with a high degree of freedom with respect to the type, shape and dimensions of the material to be sprayed is preferably used.
- the metal oxide film according to the present invention is less prone to cracks caused by heating strongly against gases such as chlorine gas and chemicals, and has less outgas. It is extremely suitable as a protective film for structural materials of manufacturing equipment.
- substrate which consists of aluminum metals is suitable as a structural material of a semiconductor or a flat display manufacturing apparatus.
- the semiconductor or flat display manufacturing apparatus is a manufacturing apparatus used in the field of manufacturing semiconductors or flat displays, that is, chemical vapor deposition (CVD), physical vapor deposition (PVD), vacuum vapor deposition, and sputtering. Examples include vacuum thin film forming equipment used for vapor deposition and microwave-excited plasma CVD, and dry etching equipment used for plasma etching, reactive ion etching (RIE), and recently developed microwave-excited plasma etching.
- Examples 1 to 10 of the present application aluminum salt IS standard A5052 material is used, tartaric acid and ethylene glycol are reagent grades manufactured by Wako Pure Chemical Industries, Ltd., adipic acid, boric acid and sodium borate, For phosphoric acid, sodium phosphate, and oxalic acid, special grades manufactured by Kanto Chemical Co., Ltd. were used, and for sulfuric acid and aqueous ammonia, EL chemical grades manufactured by Mitsubishi Chemical Co., Ltd. were used.
- the thickness of the anodized film was measured with a transmission electron microscope and a scanning electron microscope (JSM-6700, manufactured by JEOL Ltd.). The presence / absence of cracks was observed visually or with a digital microscope (Keyence VHX-200 Co., Ltd.) or a scanning electron microscope! [0097]
- the amount of water released from the anodized film surface force was measured using an atmospheric pressure ionization mass spectrometer (UG-302P, manufactured by Renesas East Japan) (hereinafter abbreviated as "APIMS analyzer"). After placing the sample in a SUS 316 reactor tube maintained at 23 ° C, argon gas was flowed at a flow rate of 1.2 LZ. Argon gas that has passed through the reactor tube is introduced into APIMS, and the mass numbers derived from water (18 (H 0+), 19 ((HIMS analyzer)
- the amount of water released per unit area (number of water molecules released [molecule Zcm 2 ]) was measured.
- the resistance of the metal oxide film to chlorine gas was measured as follows. That is, after the sample was placed in a reactor tube made of SUS316, the reactor tube was heated to 200 ° C. with a force of flowing nitrogen gas at a flow rate of 1 LZ. After reaching 200 ° C, it was kept for 5 hours for pre-beta. In this state, the reactor tube temperature was lowered to 100 ° C, and the gas was switched to chlorine gas. After the reactor tube was completely replaced with chlorine gas, 0.3 MPa of chlorine gas was sealed in the reactor tube at 100 ° C and held for 6 hours. After the chlorine gas exposure, the inside of the reactor tube was replaced with nitrogen gas. The surface properties of the sample after exposure to chlorine gas were observed visually and with a scanning electron microscope.
- composition liquids used in Examples and Comparative Examples were prepared with the compositions shown in Table 1.
- Ammonium acid pinum Um 1 ethylene alcohol 19 7.0 c
- the obtained aluminum sample with oxide film was annealed in an IR furnace at 300 ° C for 1 hour, then opened to the atmosphere and left at room temperature for 48 hours.
- the thickness of the barrier metal oxide film was measured and found to be 0.08 / zm. Also, no cracks were observed.
- the amount of water released was measured and found to be 2E16 molecules Zcm 2 or less. The results are summarized in Table 2.
- Example 1 an oxide film was formed in the same manner as in Example 1 except that the formation voltage was changed to 100V.
- the film thickness of the noria-type metal oxide film was measured and found to be 0.15 / zm.
- the cracks were also unobserved. When the amount of water released was measured, it was less than 2E16 molecule Zcm 2 o
- Example 1 an oxide film was formed in the same manner as in Example 1 except that the formation voltage was changed to 200V.
- the film thickness of the noria-type metal oxide film was measured and found to be 0.30 m.
- the cracks were unobserved. When the amount of water released was measured, it was less than 2E16 molecule Zcm 2 o
- Example 3 After dissolving 1.8 g of adipic acid in 39.5 g of water, 158 g of ethylene glycol was added and stirred and mixed. While this solution was stirred, an acid film was formed in the same manner as in Example 3 except that 29% aqueous ammonia was added until the pH of the solution reached 7.0 to prepare the chemical conversion solution b. The thickness of the barrier metal oxide film was measured and found to be 0.31 m. The cracks were unobserved. The amount of water released was measured and found to be 2E16 molecules Zcm 2 or less.
- the obtained aluminum specimen with oxide film was annealed in an IR furnace at 300 ° C for 1 hour, then opened to the atmosphere and left at room temperature for 48 hours.
- the film thickness of the noria-type metal oxide film was measured and found to be 0.29 m.
- the cracks were also unobserved. When the amount of water released was measured, it was less than 2E16 molecule Zcm 2 o
- Fig. 1 shows the voltage change with the elapsed time at the time of anodization in Example 4 and Example 5.
- Example 4 using a non-aqueous solvent as the main solvent of the chemical conversion solution is a predetermined voltage in a shorter time. It is remarkable that a metal oxide film can be formed at a high throughput.
- the chemical conversion liquid f was prepared by stirring and mixing 20 g of 98% sulfuric acid in 180 g of water. While this chemical solution was kept at 20 ° C., a 20 ⁇ 8 ⁇ 1 mm A5052 aluminum specimen was subjected to an electrolytic oxidation treatment for 2 hours at a current density of lOmAZcm and a voltage of 20V. After the reaction, the product was thoroughly washed with pure water and then dried at room temperature.
- the thickness of the obtained electrolytic oxide film was measured to be about 35 ⁇ m, and there were many fine pores on the film surface, and a porous oxide film having a porous structure was formed.
- This porous oxide film was treated for 30 minutes in pressurized water vapor at 3 atm to perform sealing treatment.
- This aluminum sample with an oxide film was annealed in an IR furnace at 200 ° C for 1 hour. Cracks occurred in the film. After leaving open to the atmosphere at room temperature for 48 hours, the amount of released water was measured and found to be 1E19 molecule Zcm 2 or more. If the amount of released water is measured under the same conditions as in the examples, it can be estimated that the value has become larger.
- Fig. 2 shows the measurement results of the water release characteristics of the samples of Example 3 and Comparative Example 1 and the untreated aluminum specimen.
- Example 3 the released moisture characteristics were almost the same as those of the untreated aluminum alloy, while in Comparative Example 1, much more released moisture was observed.
- Comparative Example 1 the treatment was performed in the same manner as Comparative Example 1 except that the electrolytic oxidation time was 3 hours.
- the film thickness of the electrolytic oxide film was measured, it was about 40 m.
- this aluminum sample with an oxide film was annealed in an IR furnace at 200 ° C for 1 hour, a crack was generated in the oxide film.
- the amount of water released was measured, it was 1E19 molecule Zcm 2 or more. If the amount of water released is measured under the same conditions as in the examples, it can be estimated that the value has become larger.
- the film thickness of the obtained electrolytic oxide film was measured to be about 13 m, and there were many fine pores on the film surface, and a porous oxide film having a porous structure was formed.
- This porous oxide film was treated for 30 minutes in pressurized water vapor at 3 atm to perform sealing treatment.
- this aluminum sample with an oxide film was annealed in an IR furnace at 300 ° C for 1 hour, a crack was generated in the porous oxide film. After leaving open to the atmosphere at room temperature for 48 hours, the amount of water released was measured and found to be 7E18 molecule Zcm 2 or more. If the amount of water released is measured under the same conditions as in the examples, it can be estimated that the value has become larger.
- FIG. 3 shows the surface states of the examples 3 and 6 and the comparative examples 1 and 3 as observed by an electron microscope after annealing. It can be seen that in Examples 3 and 6, cracks did not occur after annealing, whereas in Comparative Examples 1 and 3, fine cracks occurred.
- Examples 8 to 10 An aluminum sample piece with an oxide film obtained by the same treatment as in Examples 3, 4 and 6 was subjected to an evaluation of exposure resistance to chlorine gas according to the above-described method. The results are shown in Table 3.
- Comparative Examples 1 to 3 except that the annealing conditions were changed, an aluminum sample piece with an electrolytic oxide film obtained by the same treatment as Comparative Examples 1 to 3 was changed to chlorine gas as in Examples 8 to 10. The exposure tolerance was evaluated. The results are shown in Table 3. Moreover, the aluminum surface state by visual observation after the chlorine gas exposure evaluation in Examples 8 and 10 and Comparative Examples 4 and 5 is shown in FIG. In Examples 8 and 10, no corrosion was observed, but in Comparative Example 4, white pitting corrosion that was considered to be salty aluminum was observed, and in Comparative Example 5, partial discoloration of the specimen was observed. It was. Furthermore, FIG. 5 shows the aluminum surface state observed with an electron microscope after the chlorine gas exposure evaluation in Examples 8 to 10 and Comparative Example 6. In Examples 8 to 10, almost no change was observed after exposure to chlorine gas, whereas in Comparative Example 6, many fine deposits were observed on the surface and many fine cracks were generated.
- Examples 11 to 34 the contents of aluminum alloy IS505 A5052, 5N high purity pure aluminum (HQ0), and specific elements (iron, copper, manganese, zinc, chromium) 0.03 weight 0/0 0.1 wt% added zirconium aluminum magnesium alloy suppressed below
- a high-purity aluminum material (HQ2 and HQ4.5) manufactured by Nippon Light Metal Co., Ltd. was used.
- Tartaric acid and ethylene glycol are special grades made by Wako Pure Chemical Industries, Ltd.
- adipic acid, boric acid and sodium borate are special grades made by Kanto Chemical Co., Ltd.
- ammonia water is an EL chemical grade made by Mitsubishi Chemical Co., Ltd. Were used respectively.
- composition liquids used in the examples and comparative examples were prepared according to the compositions shown in Table 1.
- Table 4 shows the content of specific elements in the aluminum and aluminum alloys used.
- the etching amount of the metal oxide film with respect to the chemical solution was calculated as follows.
- the resistance of the metal oxide film to chlorine gas was measured as follows. In other words, after putting the sample in a SUS316 reactor tube, nitrogen gas was flowed at a flow rate of 1LZ. The reactor tube was heated to 200 ° C while flowing. After reaching 200 ° C, it was kept for 5 hours for pre-beta. In this state, the gas was switched to chlorine gas while maintaining the reactor tube temperature at 200 ° C. After the reactor tube was completely replaced with chlorine gas, 0.3 MPa chlorine gas was sealed in the reactor tube at 200 ° C and held for 6 hours. After the chlorine gas exposure, the inside of the reactor tube was replaced with nitrogen gas. The sample weight before and after exposure to chlorine gas was weighed with a precision electronic balance to evaluate the resistance of the metal oxide film due to weight loss.
- the amount of water released from the surface strength of the metal oxide film was measured using an atmospheric pressure ionization mass spectrometer (UG-302P manufactured by Renesas East Japan) (hereinafter abbreviated as “APIMS analyzer”). After placing the sample in a SUS 316 reactor tube maintained at 23 ° C, argon gas was flowed at a flow rate of 1.2 LZ. Argon gas that has passed through the reactor tube is introduced into APIMS, and the mass numbers derived from water (18 (H 0+), 19 ((H
- the amount of water released per unit area (number of water molecules released [molecule Zcm 2 ]) was measured.
- An oxide film was formed in the same manner as in Example 14 except that HQ2 and HQ4.5 were used as the sample pieces.
- the residual current density at the end of the constant voltage reaction is 0.012mAZcm 2 and 0.017mA / cm ⁇ .
- Example 19 To 194 g of water, 4.5 g of boric acid and 1.5 g of sodium borate were added and stirred and mixed. The pH of this solution was measured and found to be 7.1. In this chemical conversion solution d, an oxide film was formed in the same manner as in Example 14 except that HQ2 was used as a sample piece. The residual current density at the end of the constant voltage reaction was 0.021 mAZcm 2 .
- An oxide film was formed in the same manner as in Example 14 except that a 20 ⁇ 8 ⁇ 1 mm A5052 aluminum sample piece was used in each of the chemical conversion solutions a to d. The results are shown in Table 6.
- Fig. 6 shows the change in current density with time during the anodic oxidation in Examples 14 to 16 and Reference Example 1.
- the aluminum material used for anodic acid is suitable for the magnesium content and zirconium content. Regardless of the presence or absence, the residual current density decreased in any case, suggesting that the ion current for repairing defects in the metal oxide film due to anodized acid is small, which is even better. It can be seen that an excellent metal oxide film can be formed.
- An oxide film was formed in the same manner as in Example 15 except that HQ2 was used as a sample piece and it was formed at a constant current of current density 0. ImAZcm 2 and lOmAZcm 2 .
- the residual current densities at the end of the constant voltage reaction were 0.013 mAZcm 2 and 0.014 mAZcm 2 .
- Table 7 shows the results together with the time required to reach 200V after the start of oxidation.
- the residual current can be reduced by using high-purity aluminum that suppresses the content of specific elements (iron, copper, mangan, zinc, chromium) relative to A5052. It can be seen that the density is reduced and a good metal oxide film can be formed.
- FIG. 7 shows the voltage change with the elapsed time during anodizing in Example 21 and Reference Example 6.
- Example 21 using high-purity aluminum reaches a predetermined voltage in a shorter time, and it can be seen that a barrier-type metal oxide film can be formed with high throughput.
- each sample was placed in an IR furnace.
- ImAZcm 2 was formed at a constant current, reached 200 V, and then at a constant voltage for 5 minutes. Re-anodizing treatment was carried out.
- Table 8 shows the residual current density at the end of the constant voltage reaction and the time required to reach 200 V after the start of oxidation.
- a re-anodizing treatment was performed after annealing treatment in the same manner as in Examples 22 to 26 except that the metal oxide film formed under the conditions of Reference Examples 1, 5, and 6 was used.
- Table 8 shows the results of the residual current density at the end of the constant voltage reaction and the time required to reach 200 V after the start of oxidation.
- Fig. 8 shows the surface state after chemical treatment in Example 30.
- the barrier metal oxide film of a high-purity aluminum material has an etching amount ratio of less than 1 and higher corrosion resistance than the A5052 material at any chemical liquid type and concentration. 'Has sex.
- FIG. 9 shows the surface state after the chemical treatment in Example 33.
- the barrier metal oxide film of high-purity aluminum material has a weight reduction rate ratio of less than 1 due to exposure to chlorine gas compared to that of A5052, and it is better than chlorine gas. High corrosion resistance.
- the metal oxide film using the chemical conversion liquid b had higher corrosion resistance than that of the chemical conversion liquid d.
- Table 11 shows the composition of pure A1 and various types of A1, and Fig. 10 (a) shows the voltage characteristics when these A1s are anodized with a non-aqueous electrolyte (containing 1 mass% adipic acid). Figure 10 (b) shows the current characteristics.
- FIG. 11 shows the residual current value after anodic oxidation at this time in relation to the total content of impurities (Cu, Fe, Cr, Mn, Si) in the Al alloy.
- Figure 11 shows that the total impurity content is preferably 1% by mass or less.
- FIG. Fig. 12 (a) shows the voltage characteristics
- Fig. 12 (b) shows the current characteristics.
- the voltage characteristic increases linearly to the specified voltage for all samples, and the current characteristic is A5052. All but low enough! ⁇ Residual current reached.
- composition element total content (wi%)
- ⁇ is pure A1 after anodization and high-purity Al—Mg alloy, and ⁇ is pure A1 and high-purity Al—after annealing and repolarization.
- Mg alloy, seals are for A5052 alloy after anodization, and filled squares are for A5052 alloy after annealing and reanodization. It can be seen that the residual current value is drastically lowered by the annealing. This is because the insulating properties of the oxide film have been greatly improved. As for A5052, cracks are generated in the oxide film due to annealing and the like, and the characteristics are deteriorated.
- FIG. 15 shows the relationship between the voltage and the anodic oxide film thickness in the anodic oxidation of AlMg2 (A ⁇ Mg2wt% -Zr0.1wt%). It can be seen that the higher the voltage, the greater the thickness.
- FIG. 16 shows the relationship between the anodic oxidation voltage and the specific resistance of the oxide film in the anodic oxidation of AlMg2 (A ⁇ Mg2 wt% -ZrO.1 wt%).
- the specific resistances are all 1E 11 or more, and the resistivity increases by 10 to 50 times by annealing “reoxidation”.
- Figs. 17 (a), (b), and (c) show, respectively, an AlMg2 sample that was anodized and then the anodized film was sealed at 300 ° C for 1 hour, with ammonia gas and chlorine gas. , Exposed to HBr gas at 200 ° C The situation is shown together with the situation where the alumite in (d) was exposed to chlorine gas at 100 ° C. After exposure to gas at 0.3 MPa for 6 hours. The acid film of the present invention is damaged! / Wow! / I understand that.
- Fig. 18 shows the corrosion resistance characteristics showing the result of exposing an AlMg2 sample annealed at 300 ° C for 1 hour after anodization to irradiation ion.
- the horizontal axis shows the ion implantation energy in terms of plasma potential, and the vertical axis shows the etching amount at that time.
- the anodized film of the present invention is used for various radicals such as hydrogen radicals, oxygen radicals, chlorine radicals, odor radicals, fluorine radicals, and ion irradiation in plasma. It has a complete resistance against.
- FIG. 19 shows a high-purity A1 (total impurity content is less than lOOppm) containing 1.5% by mass and 2% by mass of Mg suitable for use in the present invention.
- the effect of dredging is shown with no addition. It can be seen that the growth of A1 grains is suppressed by Zr-added caro. It can also be seen that the same effect can be obtained by adding Mg2%.
- a metal oxide film containing aluminum as a main component in particular, a barrier type metal oxide film such as micropores and pores, and a method for producing the same.
- the metal oxide film and the laminate including the metal oxide film exhibit good corrosion resistance against chemicals and halogen gas, particularly chlorine gas, and the metal oxide film does not easily crack even when heated. Corrosion due to generation and exposure of the aluminum substrate is suppressed, and outgassing from the membrane with high thermal stability is also low.
- a protective film for structural materials such as the inner wall of vacuum equipment such as vacuum thin film forming equipment, it improves the ultimate vacuum of the equipment and improves the quality of the thin film produced. It leads to reduction of defects
- a pore-free metal oxide film that has a high withstand voltage and is less likely to cause cracks during heating can be efficiently formed.
- This metal oxide film is not only suitable as a protective film on the surface of a metal substrate, but can also be used as an impurity barrier film and anticorrosive film, and its application range is wide.
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CN2006800214926A CN101198726B (zh) | 2005-06-17 | 2006-05-09 | 金属氧化物膜、层叠体、金属构件及其制造方法 |
KR1020077030392A KR101297489B1 (ko) | 2005-06-17 | 2006-05-09 | 금속 산화물막, 적층체, 금속 부재 및 그 제조 방법 |
EP06746158.2A EP1918427B1 (en) | 2005-06-17 | 2006-05-09 | Metal oxide film, laminate, metal member and process for producing the same |
JP2007521220A JP5019391B2 (ja) | 2005-06-17 | 2006-05-09 | 金属酸化物膜、積層体、金属部材並びにその製造方法 |
US11/917,614 US8206833B2 (en) | 2005-06-17 | 2006-05-09 | Metal oxide film, laminate, metal member and process for producing the same |
US13/463,315 US9476137B2 (en) | 2005-06-17 | 2012-05-03 | Metal oxide film, laminate, metal member and process for producing the same |
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Also Published As
Publication number | Publication date |
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JPWO2006134737A1 (ja) | 2009-01-08 |
JP2012057256A (ja) | 2012-03-22 |
JP5019391B2 (ja) | 2012-09-05 |
JP5358799B2 (ja) | 2013-12-04 |
TW200706705A (en) | 2007-02-16 |
CN101198726B (zh) | 2011-07-27 |
US8206833B2 (en) | 2012-06-26 |
US20090038946A1 (en) | 2009-02-12 |
EP1918427A4 (en) | 2012-01-04 |
TWI356857B (en) | 2012-01-21 |
EP1918427A1 (en) | 2008-05-07 |
CN101198726A (zh) | 2008-06-11 |
KR20080022554A (ko) | 2008-03-11 |
US9476137B2 (en) | 2016-10-25 |
EP1918427B1 (en) | 2015-08-05 |
KR101297489B1 (ko) | 2013-08-16 |
US20120247961A1 (en) | 2012-10-04 |
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