WO2015152383A1 - 硬質材料の研磨用組成物 - Google Patents
硬質材料の研磨用組成物 Download PDFInfo
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- WO2015152383A1 WO2015152383A1 PCT/JP2015/060502 JP2015060502W WO2015152383A1 WO 2015152383 A1 WO2015152383 A1 WO 2015152383A1 JP 2015060502 W JP2015060502 W JP 2015060502W WO 2015152383 A1 WO2015152383 A1 WO 2015152383A1
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- WO
- WIPO (PCT)
- Prior art keywords
- polishing
- polishing composition
- abrasive grains
- hard material
- surface plate
- Prior art date
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- 239000000256 polyoxyethylene sorbitan monolaurate Substances 0.000 description 1
- 235000010482 polyoxyethylene sorbitan monooleate Nutrition 0.000 description 1
- 239000000244 polyoxyethylene sorbitan monooleate Substances 0.000 description 1
- 235000010483 polyoxyethylene sorbitan monopalmitate Nutrition 0.000 description 1
- 239000000249 polyoxyethylene sorbitan monopalmitate Substances 0.000 description 1
- 235000010989 polyoxyethylene sorbitan monostearate Nutrition 0.000 description 1
- 239000001818 polyoxyethylene sorbitan monostearate Substances 0.000 description 1
- 239000001205 polyphosphate Substances 0.000 description 1
- 235000011176 polyphosphates Nutrition 0.000 description 1
- 229920001282 polysaccharide Polymers 0.000 description 1
- 239000005017 polysaccharide Substances 0.000 description 1
- 229920000053 polysorbate 80 Polymers 0.000 description 1
- 239000011970 polystyrene sulfonate Substances 0.000 description 1
- 229960002796 polystyrene sulfonate Drugs 0.000 description 1
- 229920002689 polyvinyl acetate Polymers 0.000 description 1
- 239000011118 polyvinyl acetate Substances 0.000 description 1
- 229920002451 polyvinyl alcohol Polymers 0.000 description 1
- 235000019448 polyvinylpyrrolidone-vinyl acetate copolymer Nutrition 0.000 description 1
- 230000002335 preservative effect Effects 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 235000019423 pullulan Nutrition 0.000 description 1
- 150000003222 pyridines Chemical class 0.000 description 1
- 239000010453 quartz Substances 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- 235000002639 sodium chloride Nutrition 0.000 description 1
- FQENQNTWSFEDLI-UHFFFAOYSA-J sodium diphosphate Chemical compound [Na+].[Na+].[Na+].[Na+].[O-]P([O-])(=O)OP([O-])([O-])=O FQENQNTWSFEDLI-UHFFFAOYSA-J 0.000 description 1
- GCLGEJMYGQKIIW-UHFFFAOYSA-H sodium hexametaphosphate Chemical compound [Na]OP1(=O)OP(=O)(O[Na])OP(=O)(O[Na])OP(=O)(O[Na])OP(=O)(O[Na])OP(=O)(O[Na])O1 GCLGEJMYGQKIIW-UHFFFAOYSA-H 0.000 description 1
- 235000019982 sodium hexametaphosphate Nutrition 0.000 description 1
- SUKJFIGYRHOWBL-UHFFFAOYSA-N sodium hypochlorite Chemical compound [Na+].Cl[O-] SUKJFIGYRHOWBL-UHFFFAOYSA-N 0.000 description 1
- 229940048086 sodium pyrophosphate Drugs 0.000 description 1
- 239000000600 sorbitol Substances 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
- 239000011550 stock solution Substances 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- BDHFUVZGWQCTTF-UHFFFAOYSA-M sulfonate Chemical compound [O-]S(=O)=O BDHFUVZGWQCTTF-UHFFFAOYSA-M 0.000 description 1
- 150000003460 sulfonic acids Chemical class 0.000 description 1
- RAHZWNYVWXNFOC-UHFFFAOYSA-N sulfur dioxide Inorganic materials O=S=O RAHZWNYVWXNFOC-UHFFFAOYSA-N 0.000 description 1
- ISIJQEHRDSCQIU-UHFFFAOYSA-N tert-butyl 2,7-diazaspiro[4.5]decane-7-carboxylate Chemical compound C1N(C(=O)OC(C)(C)C)CCCC11CNCC1 ISIJQEHRDSCQIU-UHFFFAOYSA-N 0.000 description 1
- USFPINLPPFWTJW-UHFFFAOYSA-N tetraphenylphosphonium Chemical class C1=CC=CC=C1[P+](C=1C=CC=CC=1)(C=1C=CC=CC=1)C1=CC=CC=C1 USFPINLPPFWTJW-UHFFFAOYSA-N 0.000 description 1
- 235000019818 tetrasodium diphosphate Nutrition 0.000 description 1
- 150000003536 tetrazoles Chemical class 0.000 description 1
- 229910052718 tin Inorganic materials 0.000 description 1
- 239000011135 tin Substances 0.000 description 1
- 150000003852 triazoles Chemical class 0.000 description 1
- 229910052720 vanadium Inorganic materials 0.000 description 1
- GPPXJZIENCGNKB-UHFFFAOYSA-N vanadium Chemical compound [V]#[V] GPPXJZIENCGNKB-UHFFFAOYSA-N 0.000 description 1
- 239000012808 vapor phase Substances 0.000 description 1
- 235000015112 vegetable and seed oil Nutrition 0.000 description 1
- 239000008158 vegetable oil Substances 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09G—POLISHING COMPOSITIONS; SKI WAXES
- C09G1/00—Polishing compositions
- C09G1/02—Polishing compositions containing abrasives or grinding agents
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
- B24B37/00—Lapping machines or devices; Accessories
- B24B37/04—Lapping machines or devices; Accessories designed for working plane surfaces
- B24B37/042—Lapping machines or devices; Accessories designed for working plane surfaces operating processes therefor
- B24B37/044—Lapping machines or devices; Accessories designed for working plane surfaces operating processes therefor characterised by the composition of the lapping agent
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K3/00—Materials not provided for elsewhere
- C09K3/14—Anti-slip materials; Abrasives
- C09K3/1409—Abrasive particles per se
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K3/00—Materials not provided for elsewhere
- C09K3/14—Anti-slip materials; Abrasives
- C09K3/1454—Abrasive powders, suspensions and pastes for polishing
- C09K3/1463—Aqueous liquid suspensions
-
- 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
- C23F—NON-MECHANICAL REMOVAL OF METALLIC MATERIAL FROM SURFACE; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL; MULTI-STEP PROCESSES FOR SURFACE TREATMENT OF METALLIC MATERIAL INVOLVING AT LEAST ONE PROCESS PROVIDED FOR IN CLASS C23 AND AT LEAST ONE PROCESS COVERED BY SUBCLASS C21D OR C22F OR CLASS C25
- C23F3/00—Brightening metals by chemical means
- C23F3/04—Heavy metals
- C23F3/06—Heavy metals with acidic solutions
Definitions
- the present invention relates to a polishing composition that is suitably used for polishing a polishing object made of a hard material, and a method for producing a hard material using the same.
- the hard material generally indicates a material that is hard and difficult to process.
- ceramic materials such as aluminum oxide, zirconium oxide and silicon carbide, titanium alloys, nickel alloys, alloy materials such as stainless steel, cemented carbides such as tungsten carbide-cobalt (WC-Co)
- WC-Co cemented carbides
- Polishing such a hard material is not easy. Therefore, these materials are usually lapped with abrasive grains having high hardness such as diamond, CBN, and boron carbide.
- abrasive grains having high hardness such as diamond, CBN, and boron carbide.
- mirror lapping is performed by chemical mechanical polishing using colloidal silica after lapping is performed with diamond slurry (see Patent Document 1).
- CBN, silicon carbide, alumina, and boron carbide are used in addition to diamond abrasive grains as abrasive grains used in lapping (see Patent Document 2).
- boron suboxide (BxO) is used as abrasive grains used for lapping (see Patent Document 3).
- the diamond is very expensive, and polishing using colloidal silica requires a very long time, so it is often necessary to obtain a highly smooth surface. It took a lot of time and cost.
- the present inventor has processed a hard material at a high polishing rate by using a polishing composition in which abrasive grains made of titanium diboride (TiB 2 ) are dispersed in a dispersion. Found that can be done.
- the present invention has been made on the basis of the above knowledge, and the object of the present invention is polishing capable of polishing at a high polishing rate in an application for polishing an object to be polished (a material to be polished) made of a hard material. It is to provide a composition for use.
- the polishing composition of the present invention is characterized in that abrasive grains made of titanium diboride are dispersed in a dispersion.
- the dispersion is preferably a solvent.
- the dispersion is a binder, and the abrasive grains are fixed to the dispersion. It is preferable.
- the manufacturing method of the hard material of this invention includes the process of grind
- a polishing object made of a hard material can be polished at a high polishing rate.
- polishing target object which consists of hard materials means the grinding
- the technique disclosed herein can be applied to a polishing object having a portion made of a hard material on a part of a surface to be polished, in addition to a polishing object made of a hard material as a whole.
- the polishing composition of this embodiment is characterized in that abrasive grains made of titanium diboride are dispersed in a dispersion.
- Titanium diboride used as an abrasive is a very hard material having a Vickers hardness (Hv) of 2000 or more, and as a manufacturing method thereof, in addition to a method of directly reacting titanium and boron, titanium oxide and oxidation are used.
- a method of reducing boron, a method of vapor-phase reaction of titanium and boron halide, and the like are known (see, for example, Japanese Patent Application Publication No. 5-139725).
- As a titanium diboride abrasive grain in the technique disclosed here it is not restricted to a manufacturing method or a form, If it is generally available, it can be used without a restriction
- Titanium diboride is usually a crystalline component having a hexagonal crystal structure.
- the size of the crystal is not limited, and an amorphous component may be included. Further, other elements such as carbon, iron, oxygen, nitrogen, silicon, aluminum, and zirconium may be contained as long as they do not affect the performance of the abrasive grains.
- the purity of titanium diboride is preferably high, specifically 90% by mass or more, and more preferably 99% by mass or more.
- the purity of titanium diboride can be measured by, for example, the measured value of titanium diboride using a fluorescent X-ray apparatus, or by the intensity of a diffraction peak by a powder X-ray diffraction method. In addition, when the purity measured by the fluorescent X-ray apparatus and the purity measured based on the powder X-ray diffraction method are different, the measurement result with higher purity is adopted as the purity of the titanium diboride. Shall.
- the average particle size of titanium diboride in the polishing composition is preferably 0.1 ⁇ m or more, more preferably 0.5 ⁇ m or more, and further preferably 1 ⁇ m or more. As the average particle size increases, the polishing rate of the hard material by the polishing composition increases. In this respect, when the average particle diameter of titanium diboride is 0.1 ⁇ m or more, more specifically 0.5 ⁇ m or more, and more specifically 1 ⁇ m or more, the polishing rate of the hard material by the polishing composition is particularly suitable for practical use. It becomes easy to improve to the level. Although not particularly limited, in a preferred embodiment, the average particle size of titanium diboride may be 2 ⁇ m or more, 2.2 ⁇ m or more, and further 2.5 ⁇ m or more. Also good.
- Titanium diboride having such a size is suitable as an abrasive grain used for lapping, which will be described later, for example, because the polishing rate of a hard material can be further improved.
- the average particle diameter of titanium diboride is a weight average diameter (average diameter of weight (volume) reference distribution) determined by a laser diffraction / scattering particle size distribution measuring apparatus. The average particle size can be measured using, for example, LA-950 manufactured by Horiba, Ltd.
- the average particle size of titanium diboride in the polishing composition is preferably 50 ⁇ m or less, more preferably 10 ⁇ m or less, and even more preferably 8 ⁇ m or less. As the average particle size decreases, the dispersion stability of the polishing composition improves, and the occurrence of scratches on the hard material after being polished using the polishing composition is suppressed. In this respect, if the average particle size of titanium diboride is 50 ⁇ m or less, more specifically 10 ⁇ m or less, and more specifically 8 ⁇ m or less, the dispersion stability of the polishing composition and the polishing composition are polished. After that, it becomes easy to improve the surface accuracy of the hard material to a particularly suitable level for practical use.
- the content of titanium diboride in the polishing composition is preferably 0.05% by mass or more, more preferably 0.1% by mass or more, and further preferably 0.2% by mass or more. As the content of titanium diboride increases, the polishing rate of the hard material by the polishing composition increases. In this respect, if the content of the abrasive grains in the polishing composition is 0.05% by mass or more, more specifically 0.1% by mass or more, and more specifically 0.2% by mass or more, the polishing composition depends on the polishing composition. It becomes easy to improve the polishing speed of the hard material to a particularly suitable level for practical use.
- the content of titanium diboride in the polishing composition is preferably 40% by mass or less, more preferably 30% by mass or less, and still more preferably 20% by mass or less. Even if the content of titanium diboride increases, the polishing rate of the hard material by the polishing composition is not economical because it is difficult to improve further. In this regard, according to the technique disclosed herein, even if the content of titanium diboride in the polishing composition is 40% by mass or less, more specifically 30% by mass or less, and more specifically 20% by mass or less. The polishing rate of the hard material by the polishing composition can be maintained at a particularly suitable level for practical use.
- the abrasive grains in the polishing composition may contain other abrasive grains in addition to titanium diboride.
- abrasive grains include diamond; borides such as zirconium boride, tantalum boride, chromium boride, molybdenum boride, tungsten boride, lanthanum boride; boron carbide, silicon carbide (eg, green silicon carbide) Substantially composed of any of the following: carbides such as; oxides such as aluminum oxide, silicon oxide, zirconium oxide, titanium oxide, cerium oxide; nitrides such as boron nitride (typically cubic boron nitride); Abrasive grains to be used. Quartz etc.
- the abrasive grain which consists of silicon oxide substantially.
- a higher proportion of titanium diboride in the abrasive grains is preferable.
- the content of titanium diboride in the abrasive grains is preferably 70% by mass or more, and more preferably 90% by mass or more.
- the ratio of titanium diboride in the abrasive grains refers to the ratio of titanium diboride in the total mass of the abrasive grains contained in the polishing composition.
- a solvent can be mentioned.
- the solvent is not particularly limited as long as it can disperse the abrasive grains.
- water, and organic solvents such as alcohols, ethers, glycols, and various oils can be used.
- the oils include oil agents such as mineral oil, synthetic oil and vegetable oil.
- Such a solvent can be used individually by 1 type or in combination of 2 or more types. Among them, it is preferable to use a solvent containing water as a main component because there is no problem such as volatility or cleaning property and because of a problem of polishing waste liquid treatment.
- 90% by volume or more of the solvent containing water as a main component is preferably water, and more preferably 95% by volume or more (typically 99 to 100% by volume) is water.
- water ion exchange water (deionized water), distilled water, pure water, or the like can be used.
- a polishing agent may be added to the polishing composition to improve dispersion stability.
- the polishing composition to which a dispersant is added those in which the dispersion is a solvent are preferable.
- the dispersant include polyphosphates such as sodium hexametaphosphate and sodium pyrophosphate. Water-soluble polymers or salts thereof can also be used as a dispersant.
- the dispersant By adding the dispersant, the dispersion stability of the polishing composition is improved, and the supply of the polishing composition can be stabilized by making the slurry concentration uniform.
- the precipitate generated by the precipitation of the abrasive grains in the polishing composition during storage or transportation tends to be strong. Therefore, it is not easy to disperse the precipitate when using the polishing composition. That is, the redispersibility of the abrasive grains in the polishing composition may decrease.
- water-soluble polymers used as dispersants include polycarboxylic acids, polycarboxylic acid salts, polysulfonic acid, polysulfonic acid salts, polyamines, polyamides, polyols, polysaccharides, derivatives and copolymers thereof, etc. Is mentioned.
- the weight average molecular weight (Mw) of the water-soluble polymer is not particularly limited. From the viewpoint of sufficiently exhibiting the effect of improving the dispersion stability, it is usually appropriate that Mw is about 10,000 or more (for example, more than 50,000).
- the upper limit of Mw is not particularly limited, but it is usually about 800,000 or less (eg, 600,000 or less, typically 300,000 or less) from the viewpoints of filterability and detergency.
- Mw of the water-soluble polymer a value based on gel permeation chromatography (GPC) (aqueous, converted to polyethylene oxide) can be adopted.
- GPC gel permeation chromatography
- the content of the dispersant is, for example, suitably 0.001% by mass or more, preferably 0.005% by mass. As mentioned above, More preferably, it is 0.01 mass% or more, More preferably, it is 0.02 mass% or more.
- the content is usually suitably 10% by mass or less, preferably 5% by mass or less, for example 1% by mass or less.
- various surfactants may be added to the polishing composition.
- the surfactant here is typically a compound having a lower molecular weight than that of the dispersant, and preferably a compound having a molecular weight of less than 10,000.
- the polishing composition to which the surfactant is added those in which the dispersion is a solvent are preferable.
- a surfactant is used, the dispersibility of the abrasive grains can be changed by adsorbing to the abrasive grain surface or the surface of the object to be polished and changing the surface state thereof, or a protective film can be formed on the surface of the object to be polished. By doing so, it is possible to prevent defects on the surface of the object to be polished and to prevent enlargement of the defects.
- the surfactant may be either an anionic or nonionic surfactant.
- preferable nonionic surfactants include a polymer having a plurality of the same or different types of oxyalkylene units, and a compound in which an alcohol, hydrocarbon or aromatic ring is bonded to the polymer.
- polyoxyethylene alkyl ether polyoxyethylene polyoxypropylene alkyl ether, polyoxyethylene polyoxybutylene alkyl ether, polyoxyethylene polyoxypropylene polyoxybutylene alkyl ether, polyoxyethylene carboxylic acid ester, polyoxyethylene Oxyethylene carboxylic acid diester, polyoxyethylene polyoxypropylene carboxylic acid ester, polyoxyethylene polyoxybutylene carboxylic acid ester, polyoxyethylene polyoxypropylene polyoxybutylene carboxylic acid ester, polyoxyethylene polyoxypropylene copolymer, polyoxyethylene Polyoxybutylene copolymer, polyoxyethylene polyoxypropylene polyoxybutylene copolymer , Polyoxyethylene sorbitan fatty acid ester and polyoxyethylene sorbite fatty acid ester, polyoxyethylene sorbitan monolaurate, polyoxyethylene sorbitan monopalmitate, polyoxyethylene sorbitan monostearate, polyoxyethylene sorbitan monooleate, polyoleic
- anionic surfactants include sulfonic acid surfactants, and more specifically alkyl sulfonic acids, alkyl ether sulfonic acids, polyoxyethylene alkyl ether sulfonic acids, alkyl aromatic sulfonic acids, alkyl ether aromatics. Aromatic sulfonic acid, polyoxyethylene alkyl ether aromatic sulfonic acid and the like.
- the content of the surfactant is, for example, suitably 0.001% by mass or more, preferably 0.005. It is at least 0.01 mass%, more preferably at least 0.01 mass%, still more preferably at least 0.02 mass%.
- the content is usually suitably 10% by mass or less, preferably 5% by mass or less, for example 1% by mass or less.
- the content of the dispersant and the surfactant in the polishing composition may vary depending on the type, size, content, etc. of the abrasive grains to be used, the optimal content is appropriately set as necessary. Is preferred.
- these dispersants and surfactants act on not only the abrasive grains but also the object to be polished during polishing, some dispersants may suppress the polishing rate of the object to be polished. Considering this, it is preferable to select the type and amount of the dispersing agent or surfactant.
- the pH of the polishing composition is not particularly limited. Usually, it is preferable that pH of polishing composition is 1 or more. Moreover, it is preferable that pH of polishing composition is 12 or less. If the pH of the polishing composition is within the above range, it becomes easy to improve the polishing rate of the hard material by the polishing composition to a particularly suitable level for practical use. It is preferable to use a polishing composition having an appropriate pH in consideration of the vulnerability of the polishing object to pH. For example, in the case of stainless steel, the pH of the polishing composition can be 1 or more and 8 or less, and more preferably 1 or more and 5 or less (for example, 2 or more and 4 or less).
- the pH of the polishing composition can be adjusted using various acids, bases, or salts thereof.
- organic acids such as citric acid and other organic carboxylic acids, organic phosphonic acids and organic sulfonic acids, inorganic acids such as phosphoric acid, phosphorous acid, sulfuric acid, nitric acid, hydrochloric acid, boric acid and carbonic acid, tetramethoxyammonium
- organic bases such as oxide, trimethanolamine and monoethanolamine
- inorganic bases such as potassium hydroxide, sodium hydroxide and ammonia, or salts thereof are preferably used.
- These acids, bases, or salts thereof can be used alone or in combination of two or more.
- the polishing composition of the present invention may contain components other than those described above, if necessary.
- examples of such components include anticorrosives, chelating agents, preservatives, antifungal agents and the like.
- anticorrosive include amines, pyridines, tetraphenylphosphonium salts, benzotriazoles, triazoles, tetrazoles, benzoic acid and the like.
- chelating agents include carboxylic acid chelating agents such as gluconic acid, amine chelating agents such as ethylenediamine, diethylenetriamine, and trimethyltetraamine, ethylenediaminetetraacetic acid, nitrilotriacetic acid, hydroxyethylethylenediaminetriacetic acid, triethylenetetraminehexaacetic acid.
- Polyaminopolycarboxylic chelating agents such as diethylenetriaminepentaacetic acid, 2-aminoethylphosphonic acid, 1-hydroxyethylidene-1,1-diphosphonic acid, aminotri (methylenephosphonic acid), ethylenediaminetetrakis (methylenephosphonic acid), diethylenetriaminepenta ( Methylenephosphonic acid), ethane-1,1-diphosphonic acid, ethane-1,1,2-triphosphonic acid, methanehydroxyphosphonic acid, 1-phosphonobutane-2,3,4-to Organic phosphonic acid chelating agents such as carboxylic acid, phenol derivatives, 1,3-diketones and the like.
- Examples of preservatives include sodium hypochlorite and the like.
- Examples of antifungal agents include oxazolines such as oxazolidine-2,5-dione.
- the method for producing the polishing composition of the present invention is not particularly limited as long as the polishing composition described above can be prepared.
- a polishing composition can be obtained by stirring and mixing abrasive grains and, if necessary, a dispersant, a pH adjuster and other components in a solvent.
- a binder is exemplified. Specifically, in addition to resin bond grindstones, metal bond grindstones, vitrified bond grindstones, electrodeposited grindstones, fixed abrasive particles such as polishing wheel segments and abrasive cloths fixed with a binder. By using it as a polishing composition, it can be expected that excellent processing performance can be obtained particularly when polishing a hard material.
- resin bond grindstones metal bond grindstones, vitrified bond grindstones, electrodeposited grindstones, fixed abrasive particles such as polishing wheel segments and abrasive cloths fixed with a binder.
- a hard material polishing composition comprising abrasive grains made of titanium diboride and a dispersion in which the abrasive grains are dispersed.
- the dispersion is a solvent.
- the polishing composition in which the dispersion medium is a solvent for example, while contacting the hard material as the polishing object and the surface plate while supplying the polishing composition on a metal surface plate In a mode in which both are moved relative to each other, it can be preferably used for polishing the hard material.
- the polishing composition in a form in which the dispersion medium is a solvent also includes a hard material as a polishing object and the polishing pad while supplying the polishing composition onto a polishing pad affixed on a surface plate. It can also be preferably used in an embodiment in which the hard material is polished by making both move relative to each other while being in contact with each other. According to this specification, the manufacturing method of a hard material is provided including the process of grind
- the dispersion is a binder, and the abrasive grains are fixed to the dispersion.
- a method for producing a hard material including a step of polishing the surface of the hard material using a polishing composition in which abrasive grains are fixed to a binder as a dispersion.
- the hard material refers to a material having high hardness, and typically refers to a material having a Vickers hardness exceeding 100 HV.
- Hard materials include ceramic materials such as aluminum oxide, zirconium oxide and silicon carbide, alloy materials such as titanium alloy, nickel alloy and stainless steel, cemented carbide materials such as tungsten carbide-cobalt (WC-Co), etc. Is mentioned.
- the Vickers hardness indicates the fastness to the indentation pressure, and specifically is a hardness measured by the method described in JIS Z2244: 2009. Ceramics are sintered bodies obtained by baking and solidifying crystalline materials made of metal oxides, carbides, nitrides, borides, etc. by heat treatment at high temperatures, such as aluminum oxide, zirconium oxide, silicon carbide, etc. Is mentioned.
- the technique disclosed herein can be preferably applied to polishing hard metal materials, that is, metal materials having a Vickers hardness exceeding 100 HV.
- the titanium alloy contains titanium as a main component and contains, for example, aluminum, iron, vanadium, and the like as metal species different from the main component.
- the content of the metal species different from the main component in the titanium alloy is, for example, 3.5 to 30% by mass with respect to the entire alloy material.
- Examples of the titanium alloy include those of 11 to 23 types, 50 types, 60 types, 61 types, and 80 types in the types described in JIS H4600: 2012.
- the nickel alloy contains nickel as a main component and contains at least one selected from, for example, iron, chromium, molybdenum, and cobalt as a metal species different from the main component.
- the content of the metal species different from the main component in the nickel alloy is, for example, 20 to 75% by mass with respect to the entire alloy material.
- Examples of the nickel alloy include NCF600, 601, 625, 750, 800, 800H, 825, NW0276, 4400, 6002, 6022 and the like in the alloy number described in JIS H4551: 2000
- Stainless steel contains iron as a main component and contains at least one selected from the group consisting of chromium, nickel, molybdenum, and manganese as a metal species different from the main component.
- the content of the metal species different from the main component in the stainless steel is, for example, 10 to 50% by mass with respect to the entire alloy material.
- Examples of stainless steel include SUS201, 303, 303Se, 304, 304L, 304NI, 305, 305JI, 309S, 310S, 316, 316L, 321, 347, 384, in the symbols of the type described in JIS G4303: 2005. XM7, 303F, 303C, 430, 430F, 434, 410, 416, 420J1, 420J2, 420F, 420C, 631J1 and the like.
- polishing of a substrate made of stainless steel using the polishing composition of the present invention can be performed using a general polishing apparatus.
- the polishing apparatus include a single-side polishing apparatus and a double-side polishing apparatus.
- a substrate is held using a holder called a carrier, and a surface of the substrate is polished by rotating the surface plate by pressing the surface plate against one surface of the substrate while supplying the polishing composition.
- a substrate is held by using a holder called a carrier, and while supplying a polishing composition from above, a surface plate is pressed against the opposite surface of the substrate and rotated in a relative direction to rotate the substrate. Polish both sides simultaneously.
- the method of directly polishing the substrate using the surface of the surface plate is called lapping, and a method of polishing between the surface of the surface of the polishing pad and the substrate is applied by polishing the surface pad. That's it.
- CMP chemical mechanical polishing
- the polishing conditions in the above polishing step are not particularly limited, but it is preferable to set the polishing pressure and linear velocity for the substrate within a specific range from the viewpoint of improving the polishing rate.
- the polishing pressure is preferably 50 g or more per 1 cm 2 of processing area, and more preferably 100 g or more per 1 cm 2 of processing area.
- the polishing pressure is preferably 1000 g or less per 1 cm 2 of processing area.
- the linear velocity is a value that changes due to the influence of the platen rotation number, the carrier rotation number, the substrate size, the number of substrates, and the like.
- the linear velocity is high, the frictional force applied to the substrate is increased, so that the effect of mechanically polishing the edge is increased.
- frictional heat is generated by friction, and the chemical action by the polishing composition tends to be enhanced.
- the linear velocity is preferably 10 m / min or more, more preferably 30 m / min or more.
- the linear velocity is preferably 300 m / min or less, more preferably 200 m / min or less.
- a high polishing rate is obtained by increasing the linear velocity.
- the linear velocity is too low, there is a tendency that it is difficult to obtain a sufficient polishing rate. If the linear velocity is too high, the surface of the substrate or the polishing pad is damaged due to friction, or the friction to the substrate is not sufficiently transmitted. In addition, a so-called substrate may slide and may not be sufficiently polished.
- the amount of polishing composition supplied during polishing varies depending on the type of substrate to be polished, the polishing apparatus, other polishing conditions, etc., but the polishing composition is supplied evenly between the substrate and the surface plate. Any amount sufficient to be applied.
- the polishing composition may not be supplied to the entire substrate, or the polishing composition may dry and solidify to cause defects on the substrate surface.
- excessive polishing composition especially a medium such as water
- hinders friction and hinders polishing. is there.
- the surface plate used in the polishing process using the polishing composition of the above embodiment is required to be easily processed in order to maintain the accuracy of the surface plate surface in the case of lapping without attaching a polishing pad.
- the surface plate which the said surface plate surface consists of metal materials, such as cast iron, tin, copper, or a copper alloy, for example is used suitably.
- the surface of the surface plate (surface plate surface) may be provided with a groove for the purpose of stably supplying the polishing composition and adjusting the processing pressure.
- the shape and depth of the grooves are arbitrary, and for example, the grooves may be engraved in a lattice shape or a radial shape.
- the surface plate has a surface state that allows the processing force by the abrasive grains to efficiently act on the object to be polished.
- a surface plate in which a large number of minute grooves (hereinafter also referred to as “micro grooves”) are formed on the surface of the surface plate can be preferably used.
- the abrasive particles are temporarily fixed (held) on the surface plate surface when the abrasive particles are partially fitted into the minute groove during polishing of the object to be polished. )can do. Thereby, the processing force by the abrasive grains can be efficiently applied to the object to be polished.
- the shape of the minute groove is not particularly limited.
- the aspect ratio of the fine groove is not particularly limited. Therefore, the concept of the microgroove here may include a shape generally called a dent or a dent.
- the abrasive grains tend to be fitted into the microgrooves.
- the average width of the microgrooves can be set to, for example, 0.3 ⁇ m or more, usually 0.5 ⁇ m or more, typically more than 0.5 ⁇ m, preferably 1 ⁇ m or more, 2 ⁇ m or more is more preferable.
- the processing force of the abrasive grains fitted in the minute groove tends to easily act on the object to be polished.
- the average width of the microgrooves can be, for example, 100 ⁇ m or less, usually 50 ⁇ m or less, preferably 20 ⁇ m or less, more preferably 10 ⁇ m or less, and even more preferably 5 ⁇ m or less.
- the average width of the fine grooves can be preferably applied to, for example, abrasive grains having an average particle diameter of about 1 to 20 ⁇ m.
- the polishing method and the manufacturing method of a hard material disclosed here polish an object to be polished by using abrasive grains having an average particle diameter suitable for the width of the fine groove according to the width of the fine groove of the surface plate surface. It can implement preferably in the mode to do.
- the polishing object may be any hard material disclosed herein (for example, a hard metal material).
- the average particle size of the abrasive grains used for polishing the object to be polished is 0.2 to 3 times, more preferably 0.3 to 2.5 times the average width of the fine grooves.
- a polishing composition selected so as to be preferably 0.5 to 2 times, for example 0.5 to 1.8 times can be used.
- Abrasive grains that satisfy the above relationship with respect to the average width of the microgrooves on the surface plate surface tend to contain many particles having a size that easily fits in the microgrooves. Therefore, according to the polishing composition containing such abrasive grains, the processing force of the abrasive grains can be efficiently applied to the object to be polished. That is, the fine grooves on the surface plate surface can be used more effectively, and good polishing efficiency can be realized even for hard materials.
- diboration with an average particle diameter of 0.1 to 50 ⁇ m is performed in polishing using a surface plate having an average width of 1 to 10 ⁇ m (for example, 2 to 5 ⁇ m) of micro grooves formed on the surface of the platen.
- a polishing composition containing titanium as abrasive grains can be preferably used.
- the average particle diameter of the titanium diboride is more preferably 0.5 to 20 ⁇ m, still more preferably 1 to 15 ⁇ m, for example 2 to 10 ⁇ m.
- Stainless steel and other hard metal materials are exemplified as preferred polishing objects according to the above embodiment.
- the depth of the minute groove on the surface plate surface is not particularly limited. Usually, it is appropriate that the average depth of the microgrooves is 50 ⁇ m or less, preferably 10 ⁇ m or less, more preferably 5 ⁇ m or less, for example, 2 ⁇ m or less, from the viewpoint of the cleanability of the surface plate surface and the availability of abrasive grains. be able to. In addition, by appropriately increasing the average depth of the minute grooves, the abrasive grains tend to fit into the minute grooves, and the fitted abrasive grains tend to act on the object to be polished. From this point of view, the average depth of the minute grooves is usually suitably 0.1 ⁇ m or more, preferably 0.2 ⁇ m or more, more preferably 0.5 ⁇ m or more, and further preferably more than 0.5 ⁇ m.
- the method of forming such a minute groove on the surface plate is not particularly limited.
- a method of adjusting the surface state of the surface plate using an appropriate abrasive grain (abrasive for adjusting the surface plate surface) according to the size of the target minute groove and the material of the surface plate surface can be preferably employed.
- abrasive grains that can be preferably used for surface adjustment of a surface plate made of a metal material as described above for example, green silicon carbide abrasive grains (hereinafter also referred to as “GC abrasive grains”), titanium diboride abrasive grains, boron carbide High hardness abrasive grains such as abrasive grains are exemplified. Among these, GC abrasive grains are preferable.
- the surface plate surface adjusting abrasive grains may be applied as free abrasive grains in the form of a surface plate surface adjusting slurry in which the abrasive particles are dispersed in a solvent. You may apply as a fixed abrasive in the form fixed with the binder. Usually, it is preferable to perform surface adjustment using a surface plate surface adjusting slurry.
- a method for adjusting the width of the minute groove formed on the surface plate surface a method of changing the abrasive particles used as the surface plate surface adjusting abrasive particles to one having a different average particle size, two or more types of abrasive particles having different particle sizes A method of blending them at an appropriate ratio, a method of changing the material of the surface plate surface adjusting abrasive grains, a method of changing the conditions for adjusting the surface of the surface plate, and the like can be employed.
- a method of adjusting the depth of the minute groove formed on the surface plate surface a method of changing the material of the surface plate surface adjustment abrasive grain, a method of changing the conditions when adjusting the surface of the surface plate, etc. should be adopted.
- the conditions for adjusting the surface of the surface plate include conditions such as a processing pressure, a processing time, and a surface plate speed.
- the size of the surface plate surface adjusting abrasive grains can be appropriately selected according to the target width of the minute groove and the like.
- abrasive grains for example, GC abrasive grains
- the above-mentioned surface plate surface adjusting abrasive grains may be used by blending two or more kinds of abrasive grains having one or both of different sizes and materials.
- the concentration of the surface plate surface adjustment abrasive grains in the surface plate surface adjustment slurry and the processing conditions in the surface adjustment of the polishing surface plate using the slurry are not particularly limited and should be appropriately set so as to obtain a desired surface state. Can do.
- the concentration of the surface plate surface adjusting abrasive grains in the surface plate surface adjusting slurry can be about 5 to 20% by mass (for example, 10 to 15% by mass).
- abrasive grains (abrasive grains for adjusting the surface of the surface plate) used for surface adjustment of the polishing surface plate.
- a slurry for adjusting a surface plate surface containing the abrasive grains is included.
- an abrasive having an average particle diameter of 25 to 120 ⁇ m (more preferably 35 to 75 ⁇ m) can be preferably used.
- the abrasive grains may include at least one of GC abrasive grains, titanium diboride abrasive grains, and boron carbide abrasive grains. Among these, GC abrasive grains are preferable.
- the method for producing a hard material disclosed herein includes a step of polishing a hard material using any of the polishing compositions disclosed herein, wherein the dispersion is a solvent, and the polishing. Adjusting the surface of the metal surface plate used in the process. For surface adjustment of the metal surface plate, any of the surface plate surface adjusting abrasive grains disclosed herein can be preferably used.
- the surface plate surface adjusting abrasive is preferably used as a surface plate surface adjusting slurry containing the surface plate adjusting abrasive in the form of loose abrasive.
- the matter disclosed by the present specification also includes any of the surface plate surface-adjusting slurries (A) disclosed herein and any of the polishing compositions disclosed herein, wherein the dispersion is a solvent.
- a polishing composition set comprising the polishing composition (B) as a set content is included.
- the platen surface adjusting slurry (A) and the polishing composition (B) are stored separately from each other.
- the surface plate surface adjustment slurry (A) contained in such a polishing composition set is, for example, a surface adjustment of a metal surface plate used for polishing a hard material in any of the hard material manufacturing methods disclosed herein. Can be preferably used.
- the polishing composition (B) contained in the polishing composition set can be preferably used, for example, in the step of polishing a hard material in any of the hard material manufacturing methods disclosed herein.
- the said polishing composition set may be the aspect containing the abrasive grain which replaces with the said surface plate surface adjustment slurry (A), and comprises this slurry. Moreover, it may replace with the said polishing composition (B), and the aspect containing the abrasive grain which comprises this composition may be sufficient.
- a surface plate surface adjusting slurry containing a surface plate surface adjusting abrasive having an average particle size of 25 to 120 ⁇ m (more preferably 35 to 75 ⁇ m)
- the polishing composition set containing is mentioned.
- the surface plate surface adjusting abrasive grains may include at least one of GC abrasive grains, titanium diboride abrasive grains, and boron carbide abrasive grains. Among these, GC abrasive grains are preferable.
- the material of the surface plate is not particularly limited, but stainless steel having high strength and excellent chemical resistance is preferably used.
- the polishing pad attached to the surface plate is not limited by physical properties such as the material, thickness, or hardness.
- an arbitrary polishing pad such as a polyurethane type having various hardness and thickness, a nonwoven fabric type, a suede type, a type including abrasive grains, or a type including no abrasive grains can be used.
- polishing pads since it is required to be used under a high pressure, those having little deformation due to pressure during processing, in other words, those having high hardness are more preferable.
- a polishing pad having a hardness of 70 or more in the measurement of hardness using a Shore-A hardness meter defined in Japanese Industrial Standard (JIS) K6253 is preferable.
- the polishing composition of this embodiment is characterized in that abrasive grains made of titanium diboride are dispersed in a dispersion. According to this polishing composition, a hard material can be polished at a high polishing rate.
- the polishing composition used for polishing or lapping may be collected and reused (circulated). More specifically, the used polishing composition discharged from the polishing apparatus may be once collected in a tank and supplied from the tank to the polishing apparatus again. In this case, since it is less necessary to treat the used polishing composition as a waste liquid, it is possible to reduce environmental burden and cost.
- the replenishing components may be added individually to the used polishing composition, or may be added to the used polishing composition in the form of a mixture containing two or more components in any concentration. Good.
- the supply rate of the polishing composition to the polishing apparatus is appropriately set depending on the type of hard material to be polished, the type of polishing apparatus, and the polishing conditions. However, it is preferable that the speed is sufficient to uniformly supply the polishing composition to the entire surface plate or polishing pad.
- a polishing composition containing abrasive grains that is, a fine polishing composition is used.
- the abrasive grains in the fine polishing composition preferably have an average particle size of 0.15 ⁇ m or less, more preferably 0.10 ⁇ m or less, and still more preferably, from the viewpoint of reducing waviness, roughness, and defects on the substrate surface. Is 0.07 ⁇ m or less.
- the average particle diameter of the abrasive grains in the fine polishing composition is preferably 0.01 ⁇ m or more, more preferably 0.02 ⁇ m or more.
- Abrasive grains suitably used in the fine polishing composition are colloidal oxide particles such as colloidal silica.
- the average particle diameter of the abrasive grains in the fine polishing composition can be measured by a dynamic light scattering method using, for example, Nanotrac UPA-UT151 manufactured by Nikkiso Co., Ltd.
- the pH of the fine polishing composition is preferably 1 to 4 or 9 to 11.
- the pH of the fine polishing composition can be adjusted using various acids, bases or salts thereof as in the polishing composition of the above embodiment. You may add additives, such as a chelating agent, water-soluble polymer, surfactant, antiseptic
- the polishing composition and the fine polishing composition of the embodiment may be prepared by diluting a stock solution of the composition with water, respectively.
- the action of the polishing composition at the time of polishing the hard material will be described.
- the polishing composition abrasive grains made of titanium diboride are dispersed in a dispersion.
- the hard material can be polished at a high polishing rate.
- titanium diboride is higher in hardness than diamond
- the cause of high polishing rate is not clear, but the surface of diamond is carbonized due to frictional heat during polishing and the surface hardness is low.
- the hardness of titanium diboride is not as high as that of diamond, it is presumed that it is not modified during polishing and has a sufficient hardness for processing.
- polishing can be performed with high efficiency.
- abrasive grains described in Table 1 were prepared. Those abrasive grains were dispersed in water, and 5 g / L of citric acid and 10 g / L of polyacrylic acid were added to adjust the pH to about 3.5, whereby Examples 1 to 9 and Comparative Examples 1 to 8 were used. Each polishing composition was prepared. The details of each polishing composition are shown in Table 2.
- the column of “average particle size” in Table 1 shows the results of measuring the average particle size of various abrasive grains.
- the measured value of the average particle diameter indicates the weight average diameter (average diameter of weight (volume) reference distribution) obtained using LA-950 manufactured by Horiba, Ltd.
- Hv Vickers hardness values
- the value of Vickers hardness can be measured using HMV-G manufactured by Shimadzu Corporation.
- true density values of true specific gravity (g / cm 3 ) of materials used for various abrasive grains measured by a method defined by JIS R1620 gas replacement method are shown.
- the true density value can be measured using Micromeritics Accupic 1330 manufactured by Shimadzu Corporation.
- a surface plate surface having a fine groove having a width of 2 to 5 ⁇ m and a depth of 0.8 to 2 ⁇ m was prepared by polishing with a surface plate surface adjusting slurry in advance.
- a surface plate surface adjusting slurry a slurry containing GC abrasive grains having a grain size of # 320 and GC abrasive grains having a grain size of # 240 at a mass ratio of 1: 1 and a total concentration of 13% by mass was used.
- each part of the surface plate is 20 cm in diameter, 2.8 cm in diameter at the center, 8.6 cm in radius (excluding the center), and the effective area is 307.8456 cm 2 .
- polishing compositions of Examples 7 to 9, Comparative Example 7 and Comparative Example 8 polishing of an object to be polished made of SUS304 was performed under the polishing condition B shown in Table 4.
- the object to be polished is measured by measuring the mass of the object to be polished before and after polishing, and calculating the polishing rate calculated from the difference in mass before and after polishing, and the shape measuring laser microscope VK-100 / X200 manufactured by Keyence Corporation.
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Abstract
Description
例えば、ダイヤモンドスラリーによりラッピングが行われた後、コロイダルシリカを用いた化学機械研磨によって鏡面研磨が行われることが開示されている(特許文献1参照)。また、ラッピング加工に用いられる砥粒として、ダイヤモンド砥粒の他、CBN、炭化珪素、アルミナ、炭化硼素が用いられることが開示されている(特許文献2参照)。さらに、ラッピングに用いられる砥粒として、亜酸化ホウ素(BxO)が用いられることが開示されている(特許文献3参照)。しかしながら、これらの硬質砥粒によりラッピングを行う場合、ダイヤは非常に高価であり、またコロイダルシリカを用いた研磨には非常に長くの時間を要するために、高平滑な表面を得るまでには多くの時間とコストを要することが問題とされていた。
本実施形態の研磨用組成物は、二ホウ化チタンからなる砥粒を分散体に分散してなることを特徴とする。砥粒として用いられる二ホウ化チタンは、ビッカース硬度(Hv)で2000以上有する非常に高硬度な材料であり、その製造方法としては、チタンとホウ素を直接反応させる方法のほか、酸化チタンと酸化ホウ素を還元させる方法や、チタンとホウ素のハロゲン化物を気相反応させる方法などが知られている(例えば、日本国特許出願公開平5-139725を参照)。ここに開示される技術における二ホウ化チタン砥粒としては、製造方法や形態にとらわれず、一般的に入手可能なものであれば特に制限なく使用することができる。
特に限定するものではないが、好ましい一態様において、二ホウ化チタンの平均粒子径は、2μm以上であってもよく、2.2μm以上であってもよく、さらには2.5μm以上であってもよい。このようなサイズの二ホウ化チタンは、硬質材料の研磨速度をより向上させ得ることから、例えば、後述するラッピングに用いられる砥粒として好適である。
なお、二ホウ化チタンの平均粒子径は、レーザ回折/散乱式粒子径分布測定装置によって求められる重量平均径(重量(体積)基準分布の平均径)である。上記平均粒子径は、例えば、株式会社堀場製作所製LA-950を用いて測定できる。
研磨能率の観点から、砥粒中に占める二ホウ化チタンの割合は高い方が好ましい。具体的には、砥粒中の二ホウ化チタンの含有量は70質量%以上が好ましく、より好ましくは90質量%以上である。ここで、砥粒中に占める二ホウ化チタンの割合とは、研磨用組成物に含まれる砥粒の全質量に占める二ホウ化チタンの割合をいう。
研磨用組成物のpHは、種々の酸、塩基、またはそれらの塩を用いて調整が可能である。具体的には、例えばクエン酸その他の有機カルボン酸、有機ホスホン酸、有機スルホン酸などの有機酸や、燐酸、亜燐酸、硫酸、硝酸、塩酸、ホウ酸、炭酸などの無機酸、テトラメトキシアンモニウムオキサイド、トリメタノールアミン、モノエタノールアミンなどの有機塩基、水酸化カリウム、水酸化ナトリウム、アンモニアなどの無機塩基、またはそれらの塩が好ましく用いられる。これらの酸、塩基、またはそれらの塩は、1種を単独でまたは2種以上を組み合わせて用いることができる。
防食剤の例としては、アミン類、ピリジン類、テトラフェニルホスホニウム塩、ベンゾトリアゾール類、トリアゾール類、テトラゾール類、安息香酸等が挙げられる。
キレート剤の例としては、グルコン酸等のカルボン酸系キレート剤、エチレンジアミン、ジエチレントリアミン、トリメチルテトラアミンなどのアミン系キレート剤、エチレンジアミン四酢酸、ニトリロ三酢酸、ヒドロキシエチルエチレンジアミン三酢酸、トリエチレンテトラミン六酢酸、ジエチレントリアミン五酢酸などのポリアミノポリカルボン系キレート剤、2-アミノエチルホスホン酸、1-ヒドロキシエチリデン-1,1-ジホスホン酸、アミノトリ(メチレンホスホン酸)、エチレンジアミンテトラキス(メチレンホスホン酸)、ジエチレントリアミンペンタ(メチレンホスホン酸)、エタン-1,1-ジホスホン酸、エタン-1,1,2-トリホスホン酸、メタンヒドロキシホスホン酸、1-ホスホノブタン-2,3,4-トリカルボン酸などの有機ホスホン酸系キレート剤、フェノール誘導体、1,3-ジケトン等が挙げられる。
本発明の研磨用組成物の製造方法は、上記で説明した研磨用組成物を調製することができればよく、特に制限されない。例えば、砥粒、および必要に応じて分散剤、pH調整剤や他の成分を、溶媒中で攪拌混合することにより研磨用組成物を得ることができる。
好ましい一態様に係る研磨用組成物は、上記分散体が溶媒である。このように分散媒が溶媒である形態の研磨用組成物は、例えば、該研磨用組成物を金属定盤上に供給しながら、研磨対象物としての硬質材料と前記定盤とを接触させながら、両者を相対運動させる態様で、前記硬質材料の研磨に好ましく使用することができる。分散媒が溶媒である形態の研磨用組成物は、また、定盤上に貼られた研磨パッド上に該研磨用組成物を供給しながら、研磨対象物としての硬質材料と前記研磨パッドとを接触させながら、両者を相対運動させることにより前記硬質材料を研磨する態様でも好ましく使用され得る。本明細書によると、このようにして硬質材料を研磨する工程を含む、硬質材料の製造方法が提供される。なお、当業者には明らかなように、これらの態様において、硬質材料と前記定盤または前記研磨パッドとの接触とは、上記研磨用組成物を介しての接触(典型的には、該研磨用組成物に含まれる砥粒を介しての接触)を包含する概念である。
好ましい他の一態様に係る研磨用組成物は、上記分散体が結合材であり、上記砥粒が上記分散体に固定されている。本明細書によると、このように分散体としての結合材に砥粒が固定されている形態の研磨用組成物を用いて硬質材料表面を研磨する工程を含む、硬質材料の製造方法が提供される。
セラミックスとは、金属の酸化物、炭化物、窒化物、硼化物などからなる結晶性材料を高温での熱処理によって焼き固めた焼結体であり、具体的には酸化アルミニウム、酸化ジルコニウム、炭化ケイ素等が挙げられる。
ここに開示される技術は、硬質金属材料、すなわちビッカース硬度で100HVを超える金属材料の研磨に好ましく適用され得る。
ニッケル合金は、ニッケルを主成分とし、主成分とは異なる金属種として、例えば、鉄、クロム、モリブデン、およびコバルトから選択される少なくとも1種が含有される。ニッケル合金中における主成分とは異なる金属種の含有量は、合金材料全体に対して例えば20~75質量%である。ニッケル合金としては、例えば、JIS H4551:2000に記載される合金番号において、NCF600、601、625、750、800、800H、825、NW0276、4400、6002、6022等が挙げられる。
本発明の研磨用組成物を用いたステンレス鋼からなる基板の研磨は、一般的な研磨装置を用いて行うことができる。研磨装置としては、例えば、片面研磨装置や両面研磨装置がある。片面研磨装置では、キャリアと呼ばれる保持具を用いて基板を保持し、研磨用組成物を供給しながら基板の片面に定盤を押しつけて定盤を回転させることにより基板の片面を研磨する。両面研磨装置では、キャリアと呼ばれる保持具を用いて基板を保持し、上方より研磨用組成物を供給しながら、基板の対向面に定盤を押しつけ、それらを相対方向に回転させることにより基板の両面を同時に研磨する。このとき、定盤表面を用いて直接基板を研磨する方法をラッピングといい、定盤表面に研磨パッドを貼り付け、貼り付けられた研磨パッド表面と基板との間で研磨が行われる方法をポリシングという。このとき、定盤または研磨パッドと研磨用組成物と基板との摩擦による物理的作用による加工と、研磨用組成物が基板にもたらす化学的作用によって基板が研磨されるいわゆる化学的機械研磨(CMP)が行われてもよい。
具体的には、研磨圧力は、加工面積1cm2あたり50g以上が好ましく、より好ましくは、加工面積1cm2あたり100g以上である。また、研磨圧力は、加工面積1cm2あたり1000g以下であることが好ましい。研磨圧力の増大によって、研磨時において、研磨用組成物中の砥粒と基板との接触点が増加し、摩擦力が大きくなる。そのため、高負荷な圧力下では研磨速度は高くなる傾向にある。
本実施形態においては、線速度は10m/分以上であることが好ましく、より好ましくは30m/分以上である。また、線速度は300m/分以下であることが好ましく、より好ましくは200m/分以下である。線速度の増大によって、高い研磨速度が得られる。線速度が低くなり過ぎると、十分な研磨速度が得られ難くなる傾向があり、線速度が高くなり過ぎると、摩擦により基板や研磨パッド表面が破損したり、基板への摩擦が十分に伝わらずに、所謂基板が滑る状態になって十分な研磨ができなくなったりする場合がある。
本実施形態の研磨用組成物は二ホウ化チタンからなる砥粒を分散体に分散させてなることを特徴とする。この研磨用組成物によれば、硬質材料を高い研磨速度で研磨することができる。
研磨装置に対する研磨用組成物の供給速度は、研磨する硬質材料の種類や、研磨装置の種類、研磨条件によって適宜に設定される。ただし、定盤または研磨パッドの全体に対してむらなく研磨用組成物が供給されるのに十分な速度であることが好ましい。
前記精研磨用組成物には、必要に応じて、キレート剤や水溶性高分子、界面活性剤、防腐剤、防黴剤、防錆剤などの添加剤を添加してもよい。
前記実施形態の研磨用組成物および精研磨用組成物は、それぞれ組成物の原液を水で希釈することによって調製されてもよい。
以上詳述した本実施形態によれば、次のような効果が発揮される。
(1)従来のダイヤモンドによる研磨に比べ、高能率で研磨することができる。
(2)研磨スラリーの砥粒の小粒径化、低濃度化が可能でプロセスコストを低減できる。
表1の“硬度”の欄には、各種砥粒に使用した材料のビッカース硬度の値(Hv)を示す。ビッカース硬度の値は、株式会社島津製作所製HMV-Gを用いて測定することができる。
表1の“真密度”の欄には、各種砥粒に使用した材料の、JIS R1620気体置換法で定められた方法により測定した真比重の値(g/cm3)を示す。真密度の値は、株式会社島津製作所製マイクロメリティックス アキュピック1330を用いて測定することができる。
また、実施例7~9、比較例7および比較例8の研磨用組成物を用いて、表4に示す研磨条件Bにより、SUS304からなる被研磨物のポリシングを行った。
研磨前後に被研磨物の質量を測定して、研磨前後の質量差から計算して求めた研磨速度と、株式会社キーエンス社製の形状測定レーザーマイクロスコープ VK-100/X200を用いて被研磨物の表面粗さ(Ra)の値を測定した平均の値をそれぞれ表2の“研磨速度”、“表面粗さ”の欄に示す。
また、表2の“コスト”の欄には、砥粒の価格と研磨速度から相対的に求められたコストパフォーマンスの値を、比較例2を1とした際の相対値として求めた。コストパフォーマンスのよいものほど値が大きくなっており、研磨に係る費用が少ないことがわかる。
Claims (7)
- 二ホウ化チタンからなる砥粒を分散体に分散させてなることを特徴とする、硬質材料の研磨用組成物。
- 前記分散体が、溶媒である、請求項1に記載の研磨用組成物。
- 前記分散体が結合材であり、前記砥粒が前記分散体に固定されている、請求項1に記載の研磨用組成物。
- 請求項2に記載の研磨用組成物を、金属定盤上に供給しながら、硬質材料と前記定盤とを接触させながら、両者を相対運動させることにより前記硬質材料を研磨する工程を含む、硬質材料の製造方法。
- 請求項2に記載の研磨用組成物を、定盤上に貼られた研磨パッド上に供給しながら、硬質材料と前記研磨パッドとを接触させながら、両者を相対運動させることにより前記硬質材料を研磨する工程を含む、硬質材料の製造方法。
- 請求項3に記載の研磨用組成物を用いて、硬質材料表面を研磨する工程を含む、硬質材料の製造方法。
- 前記硬質材料がステンレス鋼である、請求項4~6のいずれか1項に記載の硬質材料の製造方法。
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