WO2012101871A1 - 研磨材微粒子及びその製造方法 - Google Patents
研磨材微粒子及びその製造方法 Download PDFInfo
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- WO2012101871A1 WO2012101871A1 PCT/JP2011/073194 JP2011073194W WO2012101871A1 WO 2012101871 A1 WO2012101871 A1 WO 2012101871A1 JP 2011073194 W JP2011073194 W JP 2011073194W WO 2012101871 A1 WO2012101871 A1 WO 2012101871A1
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- 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
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- the present invention relates to abrasive fine particles and a method for producing the same.
- Cerium oxide fine particles are mainly used as a catalyst carrier and an abrasive for glass, and completely different characteristics are required for each application.
- the cerium oxide fine particles When used as a catalyst support, the cerium oxide fine particles need to have a high specific surface area, a large pore volume, and a large pore diameter, and these values are required to be maintained as much as possible even at high temperatures.
- Japanese Patent Publication No. 3-24478 discloses a specific surface area of 85 ⁇ 5 m 2 / g or more after firing at 350 to 450 ° C., preferably 100 to 130 m 2 / g after firing at 400 to 450 ° C.
- cerium oxide having: The oxide is prepared by hydrolyzing an aqueous cerium nitrate solution in a nitric acid medium, separating the resulting precipitate, washing, optionally drying and then calcining at 300-600 ° C.
- Japanese Patent Publication No. 3-24411 has a specific surface area of 85 ⁇ 5 m 2 / g or more after firing at 350 to 500 ° C., preferably 150 to 180 m 2 / g after firing at 400 to 450 ° C.
- Secondary cerium oxide is disclosed. This oxide is reacted with a ceric nitrate aqueous solution and a sulfate ion-containing aqueous solution to precipitate basic ceric sulfate, and the resulting precipitate is separated, washed, optionally dried, and then 300- It is prepared by firing at a temperature of 500 ° C.
- Japanese Patent Laid-Open No. 62-275021 discloses an intermediate product for producing the fine cerium oxide as described above and a production method thereof.
- its production method is a cerium (IV) salt.
- the aqueous solution is hydrolyzed with an acidic medium, and the resulting precipitate is separated and optionally heat treated.
- the intermediate product shows the same shape as cerium oxide in X-ray diffraction, but has a combustion loss of 20%. Further, the intermediate product produces cerium oxide having a large specific surface area after firing.
- the cerium oxide powder obtained by any of the above methods has a very small crystal grain size determined by X-ray diffraction of about 5 mm (0.5 nm) and a specific surface area of 85 ⁇ 5 m 2 / g or more. Although it is as large as 100 m 2 / g or more, the fine particles have a particle size of about 0.5 to 2 ⁇ m, and the fine particles have pores of about 50 mm.
- cerium oxide is most effective as an abrasive used for finish polishing of glass, and is widely used.
- a cerium oxide abrasive obtained by firing and pulverizing bastonite ore mainly composed of cerium carbonate is used.
- Such cerium oxide abrasives that are actually used have an average particle size of 1 to 3 ⁇ m, and since natural ore is used as the starting material, impurities that cannot be controlled are inevitably mixed in. Therefore, it cannot be used as an abrasive in the semiconductor device manufacturing process.
- a salt of carbonic acid, oxalic acid, acetic acid or the like is added to a purified aqueous solution of cerium nitrate, cerium chloride, cerium sulfate, etc.
- a product such as first cerium or first cerium acetate is precipitated, the precipitate is filtered, dried, and then fired to obtain cerium oxide. Since the oxide of Ce (III) is unstable and cannot exist in the air, all cerium oxide exists as cerium dioxide (tetravalent).
- Patent Document 1 in order to make the particle sizes uniform, an aqueous cerium nitrate solution and an aqueous ammonia solution are continuously added so that the equivalent number of ammonia is equal to or greater than the equivalent number of cerium and the pH of the reaction medium is greater than 6.
- a production method comprising the steps of simultaneously mixing, collecting the resulting precipitate by filtration, drying, calcining at 600 to 1200 ° C., and pulverizing the resulting oxide by jet mill.
- cerium nitrate When cerium nitrate is used, it is converted to cerium nitrate by adding hydrogen peroxide, and it is a kind selected from the group consisting of lanthanide and yttrium of 0.5-60% in addition to cerium
- the inclusion of the above trivalent rare earth element salt solution is an essential condition. Further, the average particle size of the obtained oxide is 0.5 to 1.7 ⁇ m, and it cannot be used for applications where the demand for surface accuracy after polishing is severe.
- Patent Document 2 as a method for producing such a cerium-based abrasive, an amount of ammonium hydrogen carbonate in excess of the stoichiometry in the reaction between the rare earth salt-containing rare earth material and the rare earth salt is mixed with water and heated. A method of firing rare earth hydroxide carbonate that precipitates is known.
- the cerium-based abrasive obtained by this production method can achieve a certain high polishing rate, it cannot be said that it is sufficiently satisfactory in terms of polishing accuracy.
- Patent Document 3 discloses a step of mixing a cerium salt and a polymer in a high boiling point organic solvent to obtain a mixture (mixing step), and heating and refluxing the mixture at a temperature of 110 ° C. or higher to form cerium oxide. And a step of precipitating (heating / refluxing step), and a method for producing spherical monodispersed core-shell cerium oxide polymer hybrid nanoparticles, wherein in the heating / refluxing step, a boiling phenomenon occurs and after heating / refluxing
- a method for producing spherical monodispersed core-shell cerium oxide polymer hybrid nanoparticles characterized by including a step of rapid cooling (rapid cooling step) is known.
- this manufacturing method requires boiling heating and a rapid cooling process, and has a problem that the manufacturing process is complicated and the manufacturing cost is high.
- Patent Document 4 discloses a cerium oxide composition containing cerium oxide and an element having an ionic radius larger than a tetravalent cerium ionic radius.
- the cerium oxide composition produced by the production method described in Examples 1 and 2 of Patent Document 4 can achieve a high polishing rate to some extent, it cannot be said that it is sufficiently satisfactory in terms of polishing accuracy. It was.
- Patent Document 5 discloses an aqueous solution of at least one carbonate-based precipitating agent selected from the group consisting of alkali metal carbonates, alkali metal hydrogen carbonates, ammonium carbonates and ammonium hydrogen carbonates, and CeO 2 / TREO (totally oxidized dilute).
- a rare earth compound aqueous solution having a soil content of 30% by mass or more is mixed stoichiometrically with an excess of a carbonic acid precipitant to form a precipitate, and the mixture is separated into solid and liquid.
- the cerium oxide abrasive produced by the manufacturing method described in Patent Document 5 can achieve a high polishing rate to some extent, it cannot be said that it is sufficiently satisfactory in terms of polishing accuracy.
- the particle size of the fine particles and the specific surface area are often associated by the following equation.
- the required level for the particle size varies depending on the application, but as the desired finished surface accuracy after polishing becomes higher, the abrasive used for it needs to be fine particles and used in the manufacturing process of semiconductor devices Therefore, it is required that the particle diameter is in the range of 0.02 to 2.0 ⁇ m and the particle diameter is uniform.
- the surface accuracy after polishing is required to be about 5 mm (0.5 nm) in terms of average surface roughness.
- the diameter needs to be 2.0 ⁇ m or less.
- each fine particle is a single crystal, each fine particle has almost the same shape, and a highly accurate flatness can be achieved.
- cerium oxide In polishing silicon oxide such as quartz substrates, cerium oxide is known to have the fastest polishing rate, and since the interlayer insulating film is silicon oxide, in order to obtain a high polishing rate for the interlayer insulating film Cerium oxide is considered the best.
- requirements for flatness and surface accuracy after polishing are extremely strict in the interlayer insulating film.
- colloidal silica is the only fine particle having a narrow particle size distribution of 0.02 to 2.0 ⁇ m, and therefore colloidal silica is used, but the polishing rate is not sufficient. Therefore, cerium oxide having a narrow particle size distribution and an average particle size of 0.02 to 2.0 ⁇ m is strongly demanded.
- the present invention has been made in view of the above problems, and its object is to have a high polishing rate and less abrasive scratches and a small variation coefficient of the particle size, and the manufacturing process is simple.
- An object of the present invention is to provide a method for producing abrasive fine particles having a low production cost.
- cerium oxide at least one element selected from La, Pr, Nd, Sm, Eu, and at least one element selected from Y, Gd, Tb, Dy, Ho, Er, Tm, Yb, Lu
- the Ce content in the cerium oxide is 20 mol% or more, and at least one element selected from the La, Pr, Nd, Sm, and Eu and the content of Ce in the cerium oxide
- the sum (mol%) is larger than the sum (mol%) of the content of at least one element selected from Y, Gd, Tb, Dy, Ho, Er, Tm, Yb, and Lu.
- Abrasive fine particles Abrasive fine particles.
- abrasive fine particle according to any one of 1 to 3, wherein the sum of the contents of at least one element selected from La, Pr, Nd, Sm, and Eu is 5 mol% or more.
- abrasive fine particles according to any one of 1 to 4, wherein the abrasive fine particles have an average particle size of 0.02 to 2.0 ⁇ m.
- a salt of Ce a salt of at least one element selected from La, Pr, Nd, Sm, and Eu, Y, Gd
- a basic carbonate of cerium is prepared by adding hydrogen peroxide and a urea compound to an aqueous solution containing a salt of at least one element selected from Tb, Dy, Ho, Er, Tm, Yb, and Lu. Then, the method for producing fine abrasive particles, wherein the obtained basic carbonate is fired in air or in an oxidizing atmosphere.
- an abrasive fine particle having a high polishing rate and less generation of abrasive scratches and a method for producing an abrasive fine particle having a small coefficient of variation in particle diameter, a simple production process and low production cost. I was able to.
- cerium oxide at least one element selected from La, Pr, Nd, Sm, and Eu
- Y, Gd, Tb, Dy, Ho, and Er In the abrasive fine particles containing at least one element selected from Tm, Yb, and Lu, the Ce content in the cerium oxide is 20 mol% or more, and selected from the La, Pr, Nd, Sm, and Eu.
- Abrasive fine particles characterized by being larger than the sum of the contents (mol%) of the abrasive, having a high polishing rate and less generating scratches, and having a small coefficient of variation in particle size, It found that the manufacturing method of the extent is simple manufacturing cost is low abrasive particles is obtained, which is completed the invention.
- the abrasive fine particles of the present invention are selected from cerium oxide, at least one element selected from La, Pr, Nd, Sm, and Eu, and Y, Gd, Tb, Dy, Ho, Er, Tm, Yb, and Lu.
- the content of Ce in the cerium oxide is 20 mol% or more, and at least one element selected from the La, Pr, Nd, Sm, and Eu
- the sum (mol%) of the content of Ce in the cerium oxide is the sum (mol) of the content of at least one element selected from Y, Gd, Tb, Dy, Ho, Er, Tm, Yb, and Lu. %) Is larger.
- At least one element selected from La, Pr, Nd, Sm, Eu, and at least one element selected from Y, Gd, Tb, Dy, Ho, Er, Tm, Yb, Lu By containing, the shape of the abrasive fine particles can be controlled, and the coefficient of variation of the particle diameter can be reduced.
- the abrasive fine particles may remain as the remaining foreign matter after polishing.
- the content of Ce in the cerium oxide was 20 mol% or more. The remaining residual abrasive fine particles can be reduced.
- the content of Ce in cerium oxide is preferably 20 to 80 mol%, more preferably 40 to 70 mol%.
- the sum (mol%) of the content of at least one element selected from Y, Gd, Tb, Dy, Ho, Er, Tm, Yb, and Lu is preferably 5 mol% or more, more preferably 5 to 10 mol. %.
- the sum (mol%) of the content of at least one element selected from La, Pr, Nd, Sm, and Eu is preferably 5 mol% or more.
- the particle size of the abrasive fine particles is monodispersed and the particle size distribution variation coefficient is 20% or less.
- Abrasive fine particles have different levels of required particle size depending on the application, but as the finished surface accuracy after polishing becomes higher, the fine particles of abrasive particles used for them need to be atomized, so that they can be used in the manufacturing process of semiconductor devices.
- the average particle size needs to be 2.0 ⁇ m or less.
- the polishing rate tends to be slower as the particle size is smaller, the advantage that the polishing rate is faster than colloidal silica is lost when the particle size is less than 0.02 ⁇ m.
- the average particle size of the abrasive fine particles is preferably in the range of 0.02 to 2.0 ⁇ m, more preferably in the range of 0.05 to 1.5 ⁇ m.
- the crystallite size of the abrasive fine particles is preferably in the range of 10 to 100 nm.
- the crystallite size is calculated using a “Wilson method” in which 10 to 15 measurable peaks of diffraction peaks obtained by X-ray diffraction are selected and measured.
- each fine particle is a single crystal, each fine particle has substantially the same shape, and a highly accurate flatness can be achieved.
- Measurement of the average particle size and coefficient of variation of particle size distribution of the abrasive fine particles was carried out by dispersing the abrasive fine particles in water using a surfactant, and using a light scattering fine particle size measuring device (for example, LA 910).
- the particle size of a large number of abrasive fine particles can be obtained from electron micrographs such as a scanning electron microscope (SEM) and a transmission electron microscope (TEM), and the coefficient of variation can be obtained from the average value and standard deviation.
- SEM scanning electron microscope
- TEM transmission electron microscope
- the dynamic light scattering method can determine the mean value and standard deviation of the particle size of the particles in the liquid, in this case based on several assumptions. For this reason, the coefficient of variation obtained from the dynamic light scattering method is less reliable than the coefficient of variation obtained directly from the SEM image.
- the abrasive fine particles of the present invention may be a single crystal or an aggregate of a plurality of fine particles.
- the shape of the abrasive fine particles of the present invention can take various forms such as a flat plate shape, a polyhedral shape, and a spherical shape, but spherical fine particles are preferable for increasing the contact ratio between the abrasive fine particles and the material to be polished during polishing. .
- the spherical fine particles are not necessarily an aggregate of spherical crystals, and includes a case where an aggregate of fine particles having other crystal forms results in the formation of spherical fine particles.
- the spherical shape refers to the major axis (a) and minor axis (b) of the spherical particles obtained from a photograph of the abrasive fine particles photographed using a scanning electron microscope (SEM) or a transmission electron microscope.
- Ratio of minor axis: (a) / (b) is defined as being in the range of 1.00 to 1.02.
- spherical abrasive fine particles By firing the obtained basic carbonate of the rare earth element in air or in an oxidizing atmosphere (oxygen), spherical abrasive fine particles can be obtained while maintaining the shape of the basic carbonate.
- the firing temperature is preferably 500 ° C. or higher.
- the present invention includes a step of adding a urea-based compound or a urea-based compound and hydrogen peroxide to an aqueous solution containing Ce to produce a basic carbonate of the Ce element, and then converting the obtained basic carbonate into air.
- Monodispersed abrasive fine particles comprising an inorganic compound containing 20 mol% or more of Ce in cerium oxide obtained by a method for producing abrasive fine particles characterized by being prepared through a step of baking in an oxidizing atmosphere. is there.
- the present inventors have found that it is necessary to control the Ce valence by adjusting the atmosphere in firing to increase the polishing rate as the fine abrasive particles to adjust cerium oxide.
- the abrasive fine particles of the present invention can be produced by the following production method 1 or 2.
- a urea compound is added to an aqueous solution containing an elemental salt to precipitate a basic carbonate of cerium, the resulting precipitate is separated into solid and liquid, and then the obtained basic carbonate is removed in the air or oxidized. Bake in a sexual atmosphere.
- a salt of Ce, a salt of at least one element selected from La, Pr, Nd, Sm, Eu, and at least one selected from Y, Gd, Tb, Dy, Ho, Er, Tm, Yb, Lu Hydrogen peroxide and a urea compound are added to an aqueous solution containing an elemental salt to precipitate cerium basic carbonate, the resulting precipitate is separated into solid and liquid, and then the obtained basic carbonate is added. Firing in air or in an oxidizing atmosphere.
- Ce salt salt of at least one element selected from La, Pr, Nd, Sm, Eu, Y, Gd, Tb, Dy, Ho, Er, Tm, Yb, Lu used in the above production method
- the salt of at least one element selected from is preferably nitrate.
- the salt of Ce include first cerium (III) nitrate, first cerium (III) chloride, and first cerium (III) sulfate, among which first cerium (III) nitrate is preferable.
- Urea compounds include urea, urea salts (eg, nitrates, hydrochlorides, etc.), N, N′-diacetylurea, N, N′-dibenzoylurea, N, N-dibenzoylurea, benzenesulfonylurea, p- Examples include toluenesulfonylurea, trimethylurea, tetraethylurea, tetramethylurea, triphenylurea, tetraphenylurea, N-benzoylurea, methylisourea, ethylisourea, and the like, with urea being preferred.
- the addition amount of the urea compound is preferably about 3 to 5 times that of the rare earth element.
- Cerium (III) oxide is unstable and is preferably converted to cerium (IV) oxide using hydrogen peroxide.
- the addition amount is preferably 1/100 to 30/100 with respect to the total concentration of the rare earth ions.
- the precipitated basic carbonate was separated by a membrane filter and baked at 700 ° C. for 2 hours to obtain abrasive fine particles 1 of the present invention.
- Abrasive fine particles 2 to 15 were produced in the same manner as in the production of the abrasive fine particles 1, except that the concentration ratio of yttrium, cerium, lanthanum, and praseodymium nitrate was changed as shown in Table 1.
- abrasive fine particles were evaluated by the following methods for elemental analysis, average particle size, particle size distribution coefficient of variation, polishing rate, scratch generation, and micro scratch generation.
- the abrasive fine particles were quantitatively analyzed for elements with an inductively coupled plasma mass spectrometer (ICP-MS). As the apparatus, SPQ9700 manufactured by SII Nano Technology Co., Ltd. was used. As a result of the quantitative analysis of the elements, the charging ratio (mol%) of each nitrate and the element ratio (mol%) of the abrasive fine particles coincided within the measurement error range.
- ICP-MS inductively coupled plasma mass spectrometer
- the average particle diameter and the coefficient of variation of the particle diameter were determined from SEM images of about 100 abrasive fine particles (see FIG. 1; abrasive fine particles 1).
- the polishing machine used is for polishing the polishing target surface with a polishing pad while supplying slurry-like abrasive fine particles to the polishing target surface.
- the abrasive particle concentration of the abrasive fine particle slurry was 100 g / L (dispersion medium was water only).
- the slurry-like abrasive fine particles were supplied at a rate of 5 liters / minute, and the abrasive fine particles were circulated.
- the polishing object was 65 mm ⁇ flat panel glass. A polishing pad made of polyurethane was used.
- the pressure of the polishing pad against the polishing surface was 9.8 kPa (100 g / cm 2 ), the rotation speed of the polishing tester was set to 100 min ⁇ 1 (rpm), and polishing was performed for 30 minutes. Then, the thickness before and after the processing was measured with Nikon Digimicro (MF501), the polishing amount per minute was calculated from the thickness displacement, and was used as the polishing rate.
- Table 1 shows the evaluation results.
- the abrasive fine particles of the present invention have a smaller coefficient of variation in particle size, a higher polishing rate, and less generation of polishing flaws than the comparative example.
- the abrasive fine particles and the method for producing the same according to the present invention may be used in the field of polishing with abrasive fine particles containing cerium oxide.
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Abstract
Description
細孔を多く持っている材料の場合には、粒径と比表面積との関係は上記の式に一致しなくなる。従って、触媒用途を念頭において開発された製造方法で得た酸化セリウムは比表面積が大きくなり、上記の式から計算して対応粒径が5nm以下の微粒子の場合であっても、実際は1μm程度である。
(1)酸化セリウム中のCeの含有量は20~80mol%が好ましく、さらに好ましくは40~70mol%である。
(2)Y、Gd、Tb、Dy、Ho、Er、Tm、Yb、Luから選ばれる少なくとも1種の元素の含有量の和(mol%)は5mol%以上が好ましく、さらに好ましくは5~10mol%である。
(3)La、Pr、Nd、Sm、Euから選ばれる少なくとも1種の元素の含有量の和(mol%)は5mol%以上が好ましい。
(4)研磨材微粒子の粒径が単分散であり、粒径分布変動係数は20%以下であることが好ましい。
研磨材微粒子は、用途によって粒径に対する要求レベルは異なるが、研磨後の仕上がり表面精度が高くなるにつれて、それに使う研磨材微粒子は微粒化が必要になり、半導体デバイスの製造工程で使うためには平均粒径が2.0μm以下である必要がある。一方、研磨速度は粒径が小さいほど遅くなる傾向にあるので、0.02μm未満の粒径ではコロイダルシリカに比べて研磨速度が速いという優位点が失われる。
本発明の研磨材微粒子としては、単一の結晶でもよく、複数の微粒子の集合体でもよい。本発明の研磨材微粒子の形状としては、平板状、多面状、球状といろいろな形態をとりうるが、研磨時の研磨材微粒子と被研磨材との接触率を上げるには、球状微粒子が好ましい。ただし、球状微粒子は、必ずしも球体結晶の集合体ではなくてもよく、その他の結晶形態をとる微粒子の集合体が結果的に球状微粒子を形成する場合も含む。
本発明はCeを含む水溶液に尿素系化合物、または尿素系化合物と過酸化水素とを添加して該Ce元素の塩基性炭酸塩を作製する工程、次いで、得られた該塩基性炭酸塩を空気中または酸化性雰囲気中で焼成する工程を経て調製されたことを特徴とする研磨材微粒子の製造方法によって得られる酸化セリウム中のCeが20mol%以上含有する無機化合物からなる単分散研磨材微粒子である。
Ceの塩と、La、Pr、Nd、Sm、Euから選ばれる少なくとも1種の元素の塩と、Y、Gd、Tb、Dy、Ho、Er、Tm、Yb、Luから選ばれる少なくとも1種の元素の塩を含有する水溶液に、尿素系化合物を添加してセリウムの塩基性炭酸塩を析出させ、得られた沈殿を固液分離し、次いで、得られた塩基性炭酸塩を空気中または酸化性雰囲気中で焼成する。
Ceの塩と、La、Pr、Nd、Sm、Euから選ばれる少なくとも1種の元素の塩と、Y、Gd、Tb、Dy、Ho、Er、Tm、Yb、Luから選ばれる少なくとも1種の元素の塩を含有する水溶液に、過酸化水素と尿素系化合物を添加してセリウムの塩基性炭酸塩を析出させ、得られた沈殿を固液分離し、次いで、得られた塩基性炭酸塩を空気中または酸化性雰囲気中で焼成する。
《研磨材微粒子の作製》
(研磨材微粒子1の作製)
イットリウム、セリウム、ランタン各硝酸塩の合計濃度が0.05モル/リットルで、イットリウム/セリウム/ランタン硝酸塩の水溶液中でのイオン含有量比(モル比)が20/70/10の水溶液10リットルを95℃に加熱した。この水溶液に、過酸化水素を0.01モル/リットルとなるように添加し、尿素を0.6モル/リットルとなるように添加し、95℃で1時間加熱し、イットリウム/セリウム/ランタン=20モル%/70モル%/10モル%の塩基性炭酸塩を調製した。
研磨材微粒子1の作製において、イットリウム、セリウム、ランタン、プラセオジウム各硝酸塩の濃度比を表1に記載のように変化させた以外は同様にして、研磨材微粒子2~15を作製した。
得られた研磨材微粒子について、元素分析、平均粒径、粒径分布変動係数、研磨速度、傷発生、微少傷発生を下記方法で評価した。
研磨材微粒子を誘導結合プラズマ質量分析装置(ICP-MS)にて元素を定量分析した。装置は、エスアイアイナノテクノロジー(株)社製SPQ9700を使用した。元素の定量分析の結果、測定誤差範囲で、各硝酸塩の仕込み比(mol%)と、研磨材微粒子の元素比(mol%)は一致した。
研磨材微粒子約100個のSEM像(図1参照;研磨材微粒子1)から平均粒径及び粒径の変動係数を求めた。
使用した研磨機は、スラリー状の研磨材微粒子を研磨対象面に供給しながら、研磨対象面を研磨パッドで研磨するものである。研磨材微粒子スラリーの砥粒濃度は、100g/Lとした(分散媒は水のみ)。そして、研磨試験では、スラリー状の研磨材微粒子を5リットル/分の割合で供給することとし、研磨材微粒子を循環使用した。なお、研磨対象物は65mmφの平面パネル用ガラスとした。また、研磨パッドはポリウレタン製のものを使用した。研磨面に対する研磨パッドの圧力は9.8kPa(100g/cm2)とし、研磨試験機の回転速度は100min-1(rpm)に設定し、30分研磨をした。そして、加工前後の厚みをNikon Digimicro(MF501)にて測定し、厚み変位から1分当たりの研磨量を算出し、研磨速度とした。
平面パネル用ガラス100枚について、50~100μmレベルの傷の有無を目視で調べた。
上記目視で傷が確認できなかった平面パネル用ガラス100枚について、(有)ビジョンサイテックス社製MicroMAX VMX-2200にて数μmレベルの微少傷を数えた。
Claims (9)
- 酸化セリウムと、La、Pr、Nd、Sm、Euから選ばれる少なくとも1種の元素と、Y、Gd、Tb、Dy、Ho、Er、Tm、Yb、Luから選ばれる少なくとも1種の元素を含有する研磨材微粒子において、前記酸化セリウム中のCe含有量が20mol%以上で、かつ、前記La、Pr、Nd、Sm、Euから選ばれる少なくとも1種の元素と前記酸化セリウム中のCeの含有量の和(mol%)が、前記Y、Gd、Tb、Dy、Ho、Er、Tm、Yb、Luから選ばれる少なくとも1種の元素の含有量の和(mol%)より大きいことを特徴とする研磨材微粒子。
- 前記酸化セリウム中のCeの含有量が40~70mol%であることを特徴とする請求項1に記載の研磨材微粒子。
- 前記Y、Gd、Tb、Dy、Ho、Er、Tm、Yb、Luから選ばれる少なくとも1種の元素の含有量の和が5~10mol%であることを特徴とする請求項1または2に記載の研磨材微粒子。
- 前記La、Pr、Nd、Sm、Euから選ばれる少なくとも1種の元素の含有量の和が5mol%以上であることを特徴とする請求項1~3のいずれか1項に記載の研磨材微粒子。
- 前記研磨材微粒子の平均粒径が0.02~2.0μmであることを特徴とする請求項1~4のいずれか1項に記載の研磨材微粒子。
- 前記研磨材微粒子の粒径分布変動係数が20%以下であることを特徴とする請求項1~5のいずれか1項に記載の研磨材微粒子。
- 前記研磨材微粒子が球状粒子であることを特徴とする請求項1~6のいずれか1項に記載の研磨材微粒子。
- 請求項1~7のいずれか1項に記載の研磨材微粒子の製造方法において、Ceの塩と、La、Pr、Nd、Sm、Euから選ばれる少なくとも1種の元素の塩と、Y、Gd、Tb、Dy、Ho、Er、Tm、Yb、Luから選ばれる少なくとも1種の元素の塩を含有する水溶液に、尿素系化合物を添加して、セリウムの塩基性炭酸塩を作製し、次いで、得られた塩基性炭酸塩を空気中または酸化性雰囲気中で焼成することを特徴とする研磨材微粒子の製造方法。
- 請求項1~7のいずれか1項に記載の研磨材微粒子の製造方法において、Ceの塩と、La、Pr、Nd、Sm、Euから選ばれる少なくとも1種の元素の塩と、Y、Gd、Tb、Dy、Ho、Er、Tm、Yb、Luから選ばれる少なくとも1種の元素の塩を含有する水溶液に、過酸化水素と尿素系化合物を添加して、セリウムの塩基性炭酸塩を作製し、次いで、得られた塩基性炭酸塩を空気中または酸化性雰囲気中で焼成することを特徴とする研磨材微粒子の製造方法。
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