WO2018155680A1 - 高純度炭酸カルシウム焼結体及びその製造方法、並びに高純度炭酸カルシウム多孔質焼結体及びその製造方法 - Google Patents
高純度炭酸カルシウム焼結体及びその製造方法、並びに高純度炭酸カルシウム多孔質焼結体及びその製造方法 Download PDFInfo
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Definitions
- the present invention relates to a high-purity calcium carbonate sintered body and a production method thereof, and a high-purity calcium carbonate porous sintered body and a production method thereof.
- Calcium carbonate sintered body is expected to be applied to the growth nuclei of artificial pearls and biological uses.
- a conventional method for producing a calcium carbonate sintered body it is generally produced by forming a mixture of calcium carbonate and a sintering aid into a molded body by isostatic pressing and sintering the molded body in a carbon dioxide atmosphere. (Patent Literature 1 and Non-Patent Literature 1).
- An object of the present invention is a high-purity calcium carbonate sintered body that has a low impurity content and can be used for biological purposes, and a method for producing the same, and a high impurity content that is low and can be used for biological purposes.
- An object of the present invention is to provide a pure calcium carbonate porous sintered body and a method for producing the same.
- the high-purity calcium carbonate sintered body of the present invention is characterized by containing 99.7% by mass or more of calcium carbonate and having a relative density of 90% or more.
- the method for producing a high-purity calcium carbonate sintered body of the present invention comprises compressing and molding calcium carbonate having a purity of 99.7% by mass or more, and producing the molded body, and sintering the molded body, And a step of producing a calcium carbonate sintered body.
- the molded body contains only calcium carbonate.
- the molded body is preferably sintered at 420 to 600 ° C.
- the compression molding is preferably uniaxial molding.
- the high-purity calcium carbonate porous sintered body of the present invention is characterized by containing 99.7% by mass or more of calcium carbonate and having a porosity of 50% by volume or more.
- the high-purity calcium carbonate porous sintered body of the present invention preferably contains 99.9% by mass or more of calcium carbonate.
- the method for producing a high-purity calcium carbonate porous sintered body according to the present invention comprises a step of preparing a dispersion containing calcium carbonate having a purity of 99.7% by mass or more, and stirring after adding a foaming agent to the dispersion And foaming and producing a foam, and sintering the foam to produce a calcium carbonate porous sintered body.
- the foam is freeze-dried and then sintered.
- the dispersion preferably contains 20% by volume or more of the calcium carbonate.
- the sintering step is preferably a preliminary sintering step after the preliminary sintering step.
- the temperature for pre-sintering is in the range of 200 to 500 ° C.
- the temperature for main sintering is not less than the temperature during pre-sintering and in the range of 420 to 600 ° C.
- the calcium carbonate for producing a high-purity calcium carbonate sintered body of the present invention is characterized by having a purity of 99.9% by mass or more.
- the calcium carbonate for producing a high-purity calcium carbonate porous sintered body of the present invention is characterized by having a purity of 99.9% by mass or more.
- the high-purity calcium carbonate sintered body of the present invention has a low impurity content and can be used for biological purposes.
- the method for producing a high-purity calcium carbonate sintered body of the present invention since the amount of the sintering aid can be reduced, a high-purity calcium carbonate sintered body having a low impurity content can be produced.
- the high-purity calcium carbonate porous sintered body of the present invention has a low impurity content and can be used for biological purposes.
- a high-purity calcium carbonate porous sintered body of the present invention since the amount of the sintering aid can be reduced, a high-purity calcium carbonate porous sintered body having a small impurity content is produced. be able to.
- FIG. 1 is a scanning electron micrograph (magnification 25 times) showing the high-purity calcium carbonate porous sintered body of Example 3.
- FIG. 2 is a scanning electron micrograph (magnification 100 times) showing the high-purity calcium carbonate porous sintered body of Example 3.
- FIG. 3 is a scanning electron micrograph (magnification 10,000 times) showing the high-purity calcium carbonate porous sintered body of Example 3.
- FIG. 4 is a scanning electron micrograph (magnification 50000 times) showing the high-purity calcium carbonate porous sintered body of Example 3.
- the calcium carbonate used in the present invention preferably has a purity of 99.7% by mass or more, more preferably 99.9% by mass or more, and still more preferably 99.95% by mass or more.
- Such high-purity calcium carbonate can be produced, for example, by the method disclosed in Japanese Patent Application Laid-Open No. 2012-240872.
- the amount of sintering aid necessary for sintering can be reduced.
- the upper limit of the purity of calcium carbonate is not particularly limited, it is generally 99.9999% by mass.
- the average particle size (D 50 ) in the particle size distribution measured by observation with a transmission electron microscope is preferably in the range of 0.05 to 0.5 ⁇ m, more preferably 0.8. It is in the range of 08 to 0.3 ⁇ m, more preferably in the range of 0.1 to 0.25 ⁇ m.
- the particle size distribution by observation with a transmission electron microscope can be obtained by measuring 1000 or more calcium carbonates to be measured by observation with a transmission electron microscope.
- the BET specific surface area of calcium carbonate used in the present invention is preferably 5 to 25 m 2 / g, more preferably 7 to 20 m 2 / g, and still more preferably 8 to 15 m 2 / g.
- the BET specific surface area is preferably 5 to 25 m 2 / g, more preferably 7 to 20 m 2 / g, and still more preferably 8 to 15 m 2 / g.
- a sintering aid may be used.
- the sintering aid include a sintering aid containing at least two carbonates of lithium, sodium and potassium and having a melting point of 600 ° C. or lower.
- the melting point of the sintering aid is preferably 550 ° C. or less, more preferably 530 ° C. or less, and further preferably in the range of 450 to 520 ° C.
- the sintering aid is preferably a mixture of potassium carbonate and lithium carbonate.
- the melting point of the sintering aid can be determined from a phase diagram, for example, or can be measured by differential thermal analysis (DTA).
- a mixture of potassium fluoride, lithium fluoride and sodium fluoride may be used as a sintering aid. It is preferable that such a mixture also has the melting point range described above.
- a sintering aid include a mixture having a composition range of 10 to 60 mol% potassium fluoride, 30 to 60 mol% lithium fluoride, and 0 to 30 mol% sodium fluoride. By setting it as such a range, it can bake at lower temperature and can manufacture the calcium carbonate sintered compact of a higher density.
- the sintering aid is mixed with calcium carbonate so that the content of the sintering aid is 1.5% by mass or less. Is preferably prepared, more preferably 1.0% by mass or less, and still more preferably 0.7% by mass or less. If the content of the sintering aid is too large, the purity and density of the calcium carbonate sintered body may not be increased.
- the use of high-purity calcium carbonate makes it possible to lower the sintering temperature as compared with the case of using calcium carbonate with low purity.
- the sintering temperature is preferably 600 ° C. or lower, more preferably 580 ° C. or lower, and further preferably 560 ° C. or lower. When the sintering temperature is too high, calcium carbonate is decomposed and calcium oxide is easily generated, which is not preferable.
- the sintering temperature is preferably 420 ° C. or higher, more preferably 430 ° C. or higher, and further preferably 440 ° C. or higher. If the sintering temperature is too low, the calcium carbonate may not be sufficiently sintered.
- a compact is produced by compression molding a calcium carbonate powder alone or a mixture of calcium carbonate powder and a sintering aid.
- the compression molding is preferably uniaxial molding.
- a high-purity calcium carbonate sintered body having a high density can be produced using a compact formed by uniaxial molding.
- the present invention is not limited to uniaxial molding, and a molded body may be produced by other known molding methods such as isostatic pressing, doctor blade molding, or casting.
- the relative density of the molded body is preferably 50% or more, more preferably 55% or more, and further preferably 58% or more.
- the relative density of the compact is a value obtained by dividing the bulk density of the compact by the theoretical density of calcium carbonate (2.711 g / cm 3 ).
- the bulk density of the molded body can be measured by the Archimedes method described later.
- the relative density of the molded body is preferably obtained by uniaxial press molding at a molding pressure of 196.1 Mpa (2000 kgf / cm 2 ). By setting the relative density within the above range, a high-purity calcium carbonate sintered body having a higher density can be obtained.
- a calcium carbonate sintered compact is manufactured by sintering said molded object.
- the atmosphere during sintering is preferably in the air.
- the present invention is not limited to this, and it may be sintered in a carbon dioxide atmosphere or an inert gas atmosphere such as nitrogen gas as in the prior art.
- a high-purity calcium carbonate sintered body having a high density can be produced even when sintered in air.
- the sintering temperature is preferably in the above range.
- the relative density of the calcium carbonate sintered body is preferably 90% or more, more preferably 95% or more, more preferably 97% or more, further preferably 98% or more, 99 % Or more is particularly preferable.
- the purity of the calcium carbonate sintered body is preferably 99.7% by mass or more, more preferably 99.8% by mass or more, more preferably 99.9% by mass or more, and 99.95.
- the content is more preferably at least 9% by mass, and particularly preferably at least 99.99% by mass.
- a calcium carbonate sintered compact can be used also for a biological use etc.
- the upper limit of the purity of a calcium carbonate sintered compact is not specifically limited, Generally, it is 99.9999 mass%.
- foaming agent examples include alkyl sulfate esters such as lauryl sulfate triethanolamine, polyoxyethylene alkyl ether sulfates, polyoxyethylene alkyl ether acetates, and alkyl polyglucosides.
- an excipient may be added to the dispersion.
- an excipient By adding an excipient, the strength of the bubbles in the dispersed foam after foaming is increased, and the shape of the foam can be stabilized.
- the excipient include starch, dextrin, polyvinyl alcohol, polypropylene glycol, pectin, alginic acids, sodium salt of carboxycellulose, and the like.
- the present invention it is preferable to disperse calcium carbonate in the dispersion medium using a device having strong stirring power such as a disper, a mixer, or a ball mill while gradually adding calcium carbonate to the dispersion medium such as water.
- a device having strong stirring power such as a disper, a mixer, or a ball mill
- the content of calcium carbonate is preferably 30 to 70% by mass in the dispersion.
- a polymer surfactant such as polyacrylate with respect to 100 parts by mass of calcium carbonate may be added as a dispersant.
- a foam is prepared by adding a foaming agent to the dispersion and stirring and foaming.
- the foaming agent is preferably added so that the concentration of the foaming agent in the dispersion is about 0.01 to 5% by mass.
- Stirring is preferably performed with a hand mixer or a disper. Since stirring may raise the temperature of the dispersion, stirring may be performed while cooling the dispersion, if necessary.
- the foam is preferably sintered after freeze-drying.
- freeze-drying the shape of the foam can be easily maintained, and the porous sintered body can be obtained in a good shape.
- the foam under normal pressure at ⁇ 40 ° C. or lower for 2 hours or more, and then gradually raise the temperature while sublimating ice crystals under reduced pressure.
- the decompression condition is preferably 20 Pa or less, and more preferably 10 Pa or less.
- the temperature is desirably gradually increased while maintaining a reduced pressure within a range where the ice crystals do not melt, and is generally controlled within a range of ⁇ 40 ° C. to 60 ° C.
- a calcium carbonate porous sintered body is produced by sintering a foam.
- the pre-sintering temperature is preferably in the range of 200 to 500 ° C, and more preferably in the range of 300 to 420 ° C.
- the temperature of the main sintering is preferably equal to or higher than the temperature at the time of preliminary sintering and within a range of 420 to 600 ° C., and more preferably within a range of 450 to 540 ° C.
- the rate of temperature increase during pre-sintering and main sintering is preferably in the range of 2 to 20 ° C./min.
- the atmosphere during sintering is preferably in the air.
- the present invention is not limited to this, and sintering may be performed in a carbon dioxide gas atmosphere or an inert gas atmosphere such as nitrogen gas. According to the present invention, a high-purity calcium carbonate porous sintered body can be produced even when sintered in air.
- the high-purity calcium carbonate porous sintered body of the present invention contains 99.7% by mass or more of calcium carbonate and has a porosity of 50% by volume or more.
- the purity of the calcium carbonate porous sintered body is preferably 99.7% by mass or more, more preferably 99.8% by mass or more, and more preferably 99.9% by mass or more. More preferably, it is 0.995% by mass or more, and particularly preferably 99.99% by mass or more. Thereby, a calcium carbonate porous sintered compact can be used also for a biological use etc.
- the upper limit of the purity of the calcium carbonate porous sintered body is not particularly limited, but is generally 99.9999% by mass.
- the porosity of the calcium carbonate porous sintered body is preferably 50% by volume or more, more preferably 60% by volume or more, more preferably 70% by volume or more, and 80% by volume or more. More preferably, it is particularly preferably 85% by volume or more. Thereby, a calcium carbonate porous sintered compact can be used also for a biological use etc.
- the upper limit of the porosity of the calcium carbonate porous sintered body is not particularly limited, but is generally 95% by volume.
- the high-purity calcium carbonate porous sintered body of the present invention preferably has communication holes extending to the outside of the sintered body. Thereby, the calcium carbonate inside the porous sintered body can be easily brought into contact with the external atmosphere. Therefore, for example, it can be used more suitably for biological use.
- Example 1 (Calcium carbonate) Calcium carbonate having a purity of 99.99% by mass, an average particle diameter (D 50 ) of 0.15 ⁇ m, and a BET specific surface area of 10 m 2 / g was used. Purity was derived by the difference method. Specifically, using an inductively coupled plasma optical emission spectrometer, measure the amount of impurities in a measurement sample in which a sample with a known mass is dissolved, and subtract the impurity content from the total as the impurity content. The value was taken as purity.
- the average particle diameter (D 50 ) was determined from the particle diameter distribution by measuring 1500 particle diameters with a transmission electron microscope for the calcium carbonate particles to be measured.
- the BET specific surface area was measured by a one-point method using a flowsorb 2200 manufactured by Shimadzu Corporation.
- the bulk density ⁇ b [g / cm 3 ] of the calcium carbonate sintered body was determined by the Archimedes method, and the obtained bulk density was divided by the theoretical density of calcium carbonate (2.711 g / cm 3 ) to determine the relative density. .
- the bulk density of the calcium carbonate sintered body was determined as follows. First, the dry weight W 1 of the samples of calcium carbonate sintered body was measured, after the sample was allowed to stand for about 10 minutes in paraffin was hot water, cooled to a room temperature extraction. The weight W 2 of the sample containing the paraffin after cooled was measured. Thereafter, the underwater weight W 3 of the sample was measured, and the bulk density ⁇ b of the sample was obtained from the following formula. Table 1 shows the relative density of the calcium carbonate sintered body.
- Table 1 shows the purity of the calcium carbonate sintered body.
- Example 2 A calcium carbonate sintered body was produced in the same manner as in Example 1 except that calcium carbonate having a purity of 99.91% by mass, an average particle diameter (D 50 ) of 0.15 ⁇ m, and a BET specific surface area of 10 m 2 / g was used. . Table 1 shows the relative density and purity of the calcium carbonate sintered body.
- Example 1 A calcium carbonate sintered body is produced in the same manner as in Example 1 except that calcium carbonate having a purity of 99.61% by mass, an average particle diameter (D 50 ) of 0.15 ⁇ m, and a BET specific surface area of 10 m 2 / g is used. I tried to do that. However, the molded body of calcium carbonate could not be sintered.
- Example 3 Pure water was put into a polyethylene bottle containing an appropriate amount of zirconia balls, and the calcium carbonate used in Example 1 was added to the pure water so as to be 39% by volume. Next, 0.8 parts by mass of polyvinyl alcohol as an excipient with respect to 100 parts by mass of calcium carbonate, a polymer surfactant as a dispersant (made by Kao Corporation, special polycarboxylic acid type polymer surfactant) After adding 2.5 parts by mass of the agent, trade name “Poise 520”), wet mixing was performed using a pod mill for 12 hours. To the obtained slurry, a 19% by mass aqueous solution of polyoxyethylene alkyl ether as a foaming agent was added so as to be 2 ml per 10 g of slurry to prepare a dispersion.
- the above dispersion was foamed using a hand mixer to obtain a foam.
- the obtained foam was poured into a mold and freeze-dried in this state.
- the freeze-drying conditions were preliminary freezing at ⁇ 40 ° C. for 12 hours under normal pressure, and maintained at 30 ° C. for 48 hours under a reduced pressure of 10 Pa.
- the freeze-dried foam was heated to a pre-sintering temperature (350 ° C.) at 10 ° C. per minute, and pre-sintered for 10 hours after the temperature was raised. After cooling, the temperature was raised to the main sintering temperature (510 ° C.) at the same rate of temperature rise, and after the temperature rise, main sintering was performed for 3 hours to obtain a calcium carbonate porous sintered body.
- a pre-sintering temperature 350 ° C.
- main sintering temperature 510 ° C.
- Table 2 shows the purity and porosity of the obtained calcium carbonate porous sintered body. Purity was measured by the same method as for the calcium carbonate sintered body. The porosity is determined by cutting the sintered body into a rectangular parallelepiped block shape, obtaining the density from the weight of the block and the apparent volume, dividing the true density of calcium carbonate by 2.711 g / cm 3 , obtaining the relative density, and calculating the relative density from the whole. The value obtained by subtracting was taken as the porosity.
- Example 4 A calcium carbonate porous sintered body was produced in the same manner as in Example 3 except that the calcium carbonate used in Example 2 was used. Table 2 shows the purity and porosity of the calcium carbonate porous sintered body.
- FIGS. 1 to 4 are scanning electron micrographs of the calcium carbonate porous sintered body obtained in Example 3.
- FIG. 1 is a magnification of 25 times
- FIG. 2 is a magnification of 100 times
- FIG. 3 is a magnification of 10000 times
- FIG. 4 is a magnification of 50000 times.
- the calcium carbonate porous sintered body has communication holes extending to the outside of the sintered body.
- the calcium carbonate particles are densely sintered to form a porous sintered body.
Abstract
Description
(炭酸カルシウム)
本発明において用いる炭酸カルシウムは、純度が99.7質量%以上であるものが好ましく、99.9質量%以上であるものがより好ましく、99.95質量%以上であるものがさらに好ましい。このような高純度の炭酸カルシウムは、例えば、特開2012-240872号公報に開示された方法で製造することができる。純度の高い炭酸カルシウムを用いることにより、焼結に必要な焼結助剤の量を少なくすることができる。また、焼結助剤を用いることなく、炭酸カルシウムの焼結体を製造することが可能である。
本発明に従い、純度の高い炭酸カルシウムを用いることにより、焼結に必要な焼結助剤の量を少なくすることができる。また、焼結助剤を用いることなく、炭酸カルシウムの焼結体を製造することが可能である。従って、本発明によれば、焼結体における炭酸カルシウムの含有量を高めることができ、高純度の炭酸カルシウム焼結体を製造することができる。
焼結温度は、600℃以下であることが好ましく、より好ましくは580℃以下であり、さらに好ましくは560℃以下である。焼結温度が高すぎると、炭酸カルシウムが分解し酸化カルシウムが生成しやすくなるため好ましくない。焼結温度は、420℃以上であることが好ましく、より好ましくは430℃以上であり、さらに好ましくは440℃以上である。焼結温度が低すぎると、炭酸カルシウムが十分に焼結しない場合がある。
本発明においては、炭酸カルシウム粉末単体、または炭酸カルシウム粉末と焼結助剤の混合物を圧縮成形して成形体を作製する。圧縮成形は、一軸成形であることが好ましい。本発明によれば、一軸成形による成形体を用いて、高い密度を有する高純度炭酸カルシウム焼結体を製造することができる。しかしながら、本発明においては、一軸成形に限定されるものではなく、静水圧プレス成形、あるいはドクターブレード成形、鋳込み成形など他に知られた成形方法により成形体を作製してもよい。
本発明においては、上記の成形体を焼結することにより、炭酸カルシウム焼結体を製造する。より簡易な工程で焼結するという観点からは、焼結の際の雰囲気は、空気中であることが好ましい。しかしながら、本発明はこれに限定されるものではなく、従来と同様に、炭酸ガス雰囲気中、あるいは窒素ガスなどの不活性ガス雰囲気中で焼結してもよい。本発明によれば、空気中で焼結させても、高い密度を有する高純度炭酸カルシウム焼結体を製造することができる。焼結温度は、上記の範囲であることが好ましい。
また、本発明においては、レーザーを照射して成形体を焼結させてもよい。また、3次元プリンターを用いて、レーザーを照射し成形体を焼結させてもよい。
(炭酸カルシウム)
炭酸カルシウムとしては、上記の高純度炭酸カルシウム焼結体の製造において説明した炭酸カルシウムを用いることができる。炭酸カルシウム多孔質焼結体の製造においても、純度の高い炭酸カルシウムを用いることにより、焼結に必要な焼結助剤の量を少なくすることができる。また、焼結助剤を用いることなく、炭酸カルシウムの多孔質焼結体を製造することが可能である。焼結助剤を用いる場合、上記と同様の焼結助剤の種類及び含有量にすることができる。
本発明において用いる発泡剤としては、ラウリル硫酸トリエタノールアミンなどのアルキル硫酸エステル塩、ポリオキシエチレンアルキルエーテル硫酸エステル塩、ポリオキシエチレンアルキルエーテル酢酸塩、アルキルポリグルコシドなどが挙げられる。
本発明においては、分散液に賦形剤を添加してもよい。賦形剤を添加することにより発泡後の分散発泡体中の気泡の強度が上がり、発泡体の形状を安定化することができる。賦形剤としては、デンプン、デキストリン、ポリビニルアルコール、ポリプロピレングリコール、ペクチン、アルギン酸類、カルボキシセルロースのナトリウム塩などが挙げられる。
本発明においては、水などの分散媒に炭酸カルシウムを徐々に添加しながら、ディスパー、ミキサー、ボールミル等の攪拌力の強い装置を用いて、炭酸カルシウムを分散媒に分散することが好ましい。炭酸カルシウムの含有量は、一般に、分散液中において30~70質量%であることが好ましい。このとき、必要であれば炭酸カルシウム100質量部に対して0~3質量部程度のポリアクリル酸塩などの高分子界面活性剤を分散剤として添加してもよい。
本発明では、上記分散液に発泡剤を添加した後撹拌し泡立てることにより発泡体を作製する。発泡剤は、分散液中の発泡剤の濃度が0.01~5質量%程度となるように添加することが好ましい。攪拌は、ハンドミキサーやディスパーなどで行うことが好ましい。撹拌を行うことで分散液の温度が上昇することがあるため、必要であれば、分散液を冷却しながら撹拌を行ってもよい。
本発明においては、上記発泡体を凍結乾燥した後、焼結することが好ましい。凍結乾燥することにより、発泡体の形状を容易に維持することができ、多孔質焼結体を良好な形状で得ることができる。
本発明においては、発泡体を焼結することにより、炭酸カルシウム多孔質焼結体を製造する。本発明においては、仮焼結した後、本焼結することが好ましい。これにより、発泡体中に含まれている有機分が残存、炭化して黒ずんだり、有機分が急激に分解を起こすことで、焼結体にヒビの発生を生じることを防ぐことができる。
本発明の高純度炭酸カルシウム多孔質焼結体は、炭酸カルシウムが99.7質量%以上含まれており、かつ気孔率が50体積%以上である。
<実施例1>
(炭酸カルシウム)
純度99.99質量%、平均粒子径(D50)0.15μm、BET比表面積10m2/gである炭酸カルシウムを用いた。純度は、差分法により導出した。具体的には、誘導結合プラズマ発光分析装置を用いて、質量既知の試料を溶解した測定検液中の不純物量を測定し、得られた結果の和を不純物含量として、全体から不純物含量を引いた値を純度とした。
炭酸カルシウムを適量のジルコニアボールが入ったポリエチレン瓶に入れ、一晩乾式混合を行い、原料粉末とした。この原料粉末を円筒状の金型内に入れ、プレス機を用いて一軸プレス成形した。98Mpa(1000kgf/cm2)の成形圧で1分間予備プレス成形した後、196.1Mpa(2000kgf/cm2)の成形圧で1分間プレス成形した。
得られた成形体を、空気中で540℃の焼成温度で3時間焼成し焼結させた。なお、焼成温度に達するまで毎分10℃で昇温させた。この焼成により、炭酸カルシウム焼結体を得た。
アルキメデス法より炭酸カルシウム焼結体のかさ密度ρb[g/cm3]を求め、得られたかさ密度を炭酸カルシウムの理論密度(2.711g/cm3)で割り、その相対密度を求めた。炭酸カルシウム焼結体のかさ密度は、次のように求めた。先ず、炭酸カルシウム焼結体の試料の乾燥重量W1を測定し、湯煎したパラフィン中にその試料を10分程度静置した後、取り出して常温になるまで冷やした。冷めた後にパラフィンを含有した試料の重量W2を測定した。その後、その試料の水中重量W3を測定し、下記の式より試料のかさ密度ρbを求めた。炭酸カルシウム焼結体の相対密度を表1に示す。
ρW:水の密度[g/cm3]
W1:試料の乾燥重量[g]
W2:パラフィンを含有した試料の重量[g]
W3:試料の水中重量[g]
炭酸カルシウム焼結体の純度は、上記の差分法により導出した。
純度99.91質量%、平均粒子径(D50)0.15μm、BET比表面積10m2/gである炭酸カルシウムを用いる以外は、実施例1と同様にして、炭酸カルシウム焼結体を製造した。炭酸カルシウム焼結体の相対密度及び純度を表1に示す。
純度99.61質量%、平均粒子径(D50)0.15μm、BET比表面積10m2/gである炭酸カルシウムを用いる以外は、実施例1と同様にして、炭酸カルシウム焼結体を製造することを試みた。しかしながら、炭酸カルシウムの成形体を焼結させることができなかった。
比較例1の炭酸カルシウムと焼結助剤とを、焼結助剤の含有量が0.7質量%となるように混合し、この混合粉末を上記のように乾式混合して原料粉末とした。この原料粉末を用いる以外は、実施例1と同様にして、炭酸カルシウム焼結体を製造した。
<実施例3>
適量のジルコニアボールが入ったポリエチレン瓶に純水を入れ、39体積%になるように実施例1で用いた炭酸カルシウムを純水に添加した。次に、炭酸カルシウム100質量部に対して、賦形剤としてのポリビニルアルコールを0.8質量部、分散剤としての高分子界面活性剤(花王株式会社製、特殊ポリカルボン酸型高分子界面活性剤、商品名「ポイズ520」)を2.5質量部添加した後、ポッドミルを用いて12時間湿式混合を行った。得られたスラリーに、スラリー10gあたり2mlとなるように、発泡剤としてのポリオキシエチレンアルキルエーテル19質量%水溶液を添加して分散液とした。
実施例2で用いた炭酸カルシウムを用いる以外は、実施例3と同様にして、炭酸カルシウム多孔質焼結体を製造した。炭酸カルシウム多孔質焼結体の純度及び気孔率を表2に示す。
比較例1で用いた炭酸カルシウムを用いる以外は、実施例3と同様にして、炭酸カルシウム多孔質焼結体を製造することを試みた。しかしながら、発泡体を焼結させることができなかった。
図1~図4は、実施例3で得られた炭酸カルシウム多孔質焼結体の走査型電子顕微鏡写真である。図1は倍率25倍、図2は倍率100倍、図3は倍率10000倍、図4は倍率50000倍である。図1及び図2から明らかのように、炭酸カルシウム多孔質焼結体は、焼結体の外部に至る連通孔を有していることがわかる。また、図3及び図4から明らかなように、炭酸カルシウム粒子が緻密に焼結されて、多孔質焼結体が形成されていることがわかる。
Claims (16)
- 炭酸カルシウムが99.7質量%以上含まれており、かつ相対密度が90%以上である、高純度炭酸カルシウム焼結体。
- 純度が99.7質量%以上である炭酸カルシウムを圧縮成形し、成形体を作製する工程と、
前記成形体を焼結することにより、炭酸カルシウム焼結体を製造する工程とを備える、高純度炭酸カルシウム焼結体の製造方法。 - 前記成形体が炭酸カルシウムのみを含む、請求項2に記載の高純度炭酸カルシウム焼結体の製造方法。
- 前記成形体を、420~600℃で焼結する、請求項2または3に記載の高純度炭酸カルシウム焼結体の製造方法。
- 前記圧縮成形が、一軸成形である、請求項2~4のいずれか一項に記載の高純度炭酸カルシウム焼結体の製造方法。
- 前記成形体を空気中で焼結する、請求項2~5のいずれか一項に記載の高純度炭酸カルシウム焼結体の製造方法。
- 炭酸カルシウムが99.7質量%以上含まれており、かつ気孔率が50体積%以上である、高純度炭酸カルシウム多孔質焼結体。
- 炭酸カルシウムが99.9質量%以上含まれている、請求項7に記載の高純度炭酸カルシウム多孔質焼結体。
- 焼結体の外部に至る連通孔が形成されている、請求項7または8に記載の高純度炭酸カルシウム多孔質焼結体。
- 純度が99.7質量%以上である炭酸カルシウムを含む分散液を調製する工程と、
前記分散液に発泡剤を添加した後撹拌して泡立て、発泡体を作製する工程と、
前記発泡体を焼結することにより、炭酸カルシウム多孔質焼結体を製造する工程とを備える、高純度炭酸カルシウム多孔質焼結体の製造方法。 - 前記発泡体を凍結乾燥した後、焼結する、請求項10に記載の高純度炭酸カルシウム多孔質焼結体の製造方法。
- 前記分散液が、前記炭酸カルシウムを20体積%以上含有する、請求項10または11に記載の高純度炭酸カルシウム多孔質焼結体の製造方法。
- 前記焼結する工程が、仮焼結した後、本焼結する工程である、請求項10~12のいずれか一項に記載の高純度炭酸カルシウム多孔質焼結体の製造方法。
- 仮焼結の温度が200~500℃の範囲内であり、本焼結の温度が仮焼結時の温度以上かつ420~600℃の範囲内である、請求項13に記載の高純度炭酸カルシウム多孔質焼結体の製造方法。
- 純度が99.9質量%以上である、高純度炭酸カルシウム焼結体製造用炭酸カルシウム
。 - 純度が99.9質量%以上である、高純度炭酸カルシウム多孔質焼結体製造用炭酸カルシウム。
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