JP3030875B2 - Method for producing translucent alumina raw material powder - Google Patents
Method for producing translucent alumina raw material powderInfo
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- JP3030875B2 JP3030875B2 JP3002617A JP261791A JP3030875B2 JP 3030875 B2 JP3030875 B2 JP 3030875B2 JP 3002617 A JP3002617 A JP 3002617A JP 261791 A JP261791 A JP 261791A JP 3030875 B2 JP3030875 B2 JP 3030875B2
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- Prior art keywords
- alumina
- raw material
- powder
- material powder
- mill
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Description
【０００１】[0001]
【産業上の利用分野】本発明は透光性アルミナ原料粉末
の製造方法に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing a transparent alumina raw material powder.
【０００２】[0002]
【従来技術の説明】高純度の多結晶アルミナは機械的・
熱的強度、耐食性、更には透光性に優れている為、従
来、高圧ナトリウムランプの発光管、高温用窓、メモリ
ー消去用窓等に使用されている。2. Description of the Prior Art High-purity polycrystalline alumina is mechanically
Because of its excellent thermal strength, corrosion resistance, and light transmissivity, it has been conventionally used for arc tubes of high-pressure sodium lamps, windows for high temperature, windows for memory erasing, and the like.
【０００３】透光性アルミナ多結晶体は９９．９％以上
の高純度アルミナに少量のＭｇＯあるいはＭｇＯ及び他
の金属酸化物を添加し、成形し、空気中８００℃〜１３
００℃で仮焼し、バインダーを充分燃焼させた後、還元
雰囲気中又は真空中で１７５０℃〜１９５０℃で１時間
〜１０時間保持して作られる。[0003] Translucent polycrystalline alumina is prepared by adding a small amount of MgO or MgO and other metal oxides to high-purity alumina of 99.9% or more, forming the mixture, and forming the mixture in air at 800 ° C to 13 ° C.
After calcination at 00 ° C. to sufficiently burn out the binder, the binder is maintained at 1750 ° C. to 1950 ° C. for 1 hour to 10 hours in a reducing atmosphere or vacuum.
【０００４】そのための原料アルミナ粉末については９
９．９％以上の高純度で、かつ微粒のアルミナが必要と
されている。特に原料アルミナ粉末中に粗粒が存在する
場合には均一な焼結の妨げとなり、１μｍ以上の粗粒を
いかに少なくするかが問題となっている。For the raw material alumina powder for this purpose, 9
High-purity 9.9% or more and fine-grain alumina are required. In particular, when coarse particles are present in the raw material alumina powder, uniform sintering is hindered, and there is a problem of how to reduce coarse particles of 1 μm or more.
【０００５】乾式振動ミル、ボールミルでは未粉砕の粗
粒は減るが、粉砕が長いと微粒が多く発生し、この微粒
が凝集した粗粒の増加が見られる。この粗粒のため焼結
が均一でなくなり、焼結体中にポアが残る。[0005] In a dry vibration mill or a ball mill, unmilled coarse particles are reduced. However, if the grinding is long, many fine particles are generated, and an increase in coarse particles in which the fine particles are aggregated is observed. Due to the coarse particles, sintering is not uniform, and pores remain in the sintered body.
【０００６】湿式ボールミルを用いる方法もあるが、こ
の場合には粉砕された微粒の凝集は見られないが、限界
粒度分布に達するには数十〜数百時間を要する等粉砕効
率が悪いばかりでなく、長時間粉砕の場合は媒体からの
汚染もすすむので好ましくない。There is also a method using a wet ball mill. In this case, no aggregation of the pulverized fine particles is observed, but the pulverization efficiency is poor, for example, it takes several tens to several hundred hours to reach the limit particle size distribution. In addition, long-time pulverization is not preferable because contamination from the medium also proceeds.
【０００７】又、ジェットミル、ピンミルでは凝集粒は
発生しないものの未粉砕粗粒が残存し、１μｍ以上の粗
粒が１０％以下にならない。In a jet mill or a pin mill, aggregated particles are not generated, but unmilled coarse particles remain, and coarse particles having a size of 1 μm or more do not become 10% or less.
【０００８】[0008]
【発明が解決しようとする課題】かかる事情に鑑み、本
発明者らは透光性に優れるアルミナ多結晶体を得るため
のアルミナ原料粉末を開発すべく、鋭意検討した結果本
発明方法を完成するに至った。In view of such circumstances, the present inventors have conducted intensive studies to develop alumina raw material powder for obtaining an alumina polycrystal having excellent translucency, and as a result, completed the method of the present invention. Reached.
【０００９】[0009]
【課題を解決する為の手段】すなわち、本発明は純度が
９９．９％以上、ＢＥＴ比表面積１ｍ2／ｇ〜７０ｍ2／
ｇのα−アルミナ又はα−アルミナと中間アルミナより
なるアルミナ粉末をジェットミルで粉砕し、次いで直径
０．２ｍｍ〜５ｍｍの粉砕媒体を用いて湿式粉砕するこ
とを特徴とする透光性アルミナ原料粉末の製造方法を提
供するにある。That Means for Solving the Problems The present invention has a purity of 99.9% or higher, BET specific surface area of 1m 2 / g~70m 2 /
g of alumina powder comprising α-alumina or α-alumina and intermediate alumina is crushed by a jet mill, and then wet crushed using a crushing medium having a diameter of 0.2 mm to 5 mm. To provide a method for manufacturing the same.
【００１０】以下本発明方法を更に詳細に説明する。本
発明における高純度アルミナとは、有機アルミニウム加
水分解法、改良バイヤー法、アンモニウム明ばん熱分解
法、アンモニウムドーソナイト熱分解法等で得られる物
であり、ジルコニア以外の不純物が０．１％未満、１μ
ｍ以上の粗粒が普通には１０〜１００％、比表面積１〜
７０ｍ2／ｇのα−アルミナまたはα−アルミナとγ−
アルミナ、δ−アルミナ、θ−アルミナ、η−アルミ
ナ、χ−アルミナ、κ−アルミナ等の中間アルミナの少
なくとも一種との共存物であり、このような物性を有す
るアルミナ粉末は、最も一般的には有機アルミニウム加
水分解法により得られる。Hereinafter, the method of the present invention will be described in more detail. The high-purity alumina in the present invention is a product obtained by an organic aluminum hydrolysis method, an improved Bayer method, an ammonium alum pyrolysis method, an ammonium dawsonite pyrolysis method, and the like, in which impurities other than zirconia are 0.1%. Less than 1μ
m is usually 10 to 100%, specific surface area is 1 to 100%.
70 m 2 / g of α-alumina or α-alumina and γ-alumina
Alumina, δ-alumina, θ-alumina, η-alumina, χ-alumina, coexisting with at least one kind of intermediate alumina such as κ-alumina, alumina powder having such physical properties, most commonly, Obtained by an organic aluminum hydrolysis method.
【００１１】湿式粉砕をする前にジェットミル、ピンミ
ル等の自由粉砕あるいは、振動ミル、ボールミル等の回
分粉砕をしておくと、粉体の分散性が向上し、スラリー
の濃度を上げることができる。If free grinding such as a jet mill or a pin mill or batch grinding such as a vibration mill or a ball mill is performed before wet grinding, the dispersibility of the powder is improved and the concentration of the slurry can be increased. .
【００１２】湿式粉砕で用いる湿式微粒粉砕機としては
タワーミル、パールミル、サンドミル、ダイノミル、ウ
ルトラビスコミル、アトライター、アニュラーミル等の
媒体攪拌ミルが挙げられ、粉砕媒体としては約０．２ｍ
ｍ〜５ｍｍ、好ましくは約０．３ｍｍ〜２ｍｍの直径を
有するアルミナ製ビーズ或いはジルコニア製ビーズが用
いられる。Examples of the wet fine particle mill used in the wet mill include a medium stirring mill such as a tower mill, a pearl mill, a sand mill, a dyno mill, an ultravisco mill, an attritor, and an annular mill.
Alumina beads or zirconia beads having a diameter of m to 5 mm, preferably about 0.3 mm to 2 mm are used.
【００１３】砕料の汚染防止の点からはアルミナ製ビー
ズの使用が推奨されるが、ジルコニア製ビーズの場合、
砕料に多少の汚染が生じても焼結性や透光性に及ぼす影
響は少ない。[0013] From the viewpoint of preventing contamination of the crushing material, the use of alumina beads is recommended, but in the case of zirconia beads,
Even if there is some contamination in the crushing material, it has little effect on sinterability and light transmission.
【００１４】該湿式粉砕でのアルミナ粉末の処理時間
は、粉砕処理に適用する装置、粉砕媒体、粉砕条件等に
より一義的ではないが、粉砕機容量に占める媒体量約３
０〜約７０体積％、スラリー濃度約１０〜約７５重量
％、好ましくは媒体量約４０〜約６０体積％、スラリー
濃度約３０〜約７０重量％の条件で、通常約１０分〜約
１時間程度であり、具体的には簡単な予備実験により決
定すればよい。The processing time of the alumina powder in the wet pulverization is not unique depending on the apparatus used for the pulverization, the pulverizing medium, the pulverizing conditions, etc., but the amount of the medium in the pulverizer capacity is about 3 times.
0 to about 70% by volume, slurry concentration of about 10 to about 75% by weight, preferably medium amount of about 40 to about 60% by volume, slurry concentration of about 30 to about 70% by weight, usually about 10 minutes to about 1 hour. Degree, and may be determined by a simple preliminary experiment.
【００１５】[0015]
【実施例】以下、実施例により本発明を更に詳細に説明
するが、実施例は本発明方法の一実施態様を示すもので
あり、これにより本発明が制約されるものではない。
尚、実施例において特に断らない限り、部、％は重量
部、重量％である。中心粒径、１μｍ以上の粒子の割
合、ＢＥＴ比表面積は以下の方法で求めた。 中心粒径（μｍ）： 島津製遠心沈降式粒度分布測定器
ＣＰ−５０を用い、水１００ｍｌに試料１ｇ及びヘキサ
メタリン酸ナトリウム（０．２％溶液）５ｍｌを加え、
超音波洗浄機で１０分間よく分散させた試料液を用い、
粒度分布を測定する。粒径に対して、累積重量割合をプ
ロットし、累積重量割合が５０％の粒径を中心粒径とし
た。 １μｍ以上の粒子の割合（％）： 中心粒径で測定した
粒度分布より、粒径１μｍ以上の重量割合を求めた。 ＢＥＴ比表面積（ｍ2／ｇ）： カンタクローム社製比
表面積測定装置モノソーブを用い、試料０．５〜１ｇを
サンプルセルに入れ、Ｎ2／Ｈｅ（３０／７０）キャリ
アーガス流通下で脱気（３５０℃、１５分）後、液体窒
素温度でキャリアーガスを吸着させる。その後室温まで
昇温させ脱着量を熱伝導度型検出器で測定しＢＥＴ比表
面積を求めた。（ＢＥＴ１点法） 透光性（％）： 日立製作所製Ｕ−２０００スペクトロ
メーター（光源−沃素タングステンランプ、検出器−シ
リコンダイオード）を用い、光源スポット径５．５ｍｍ
で透光性を測定した。The present invention will be described in more detail with reference to the following examples, which are merely illustrative of one embodiment of the method of the present invention and do not limit the present invention.
In the examples, parts and percentages are by weight unless otherwise specified. The center particle diameter, the ratio of particles having a particle diameter of 1 μm or more, and the BET specific surface area were determined by the following methods. Center particle diameter (μm): Using a Shimadzu centrifugal sedimentation type particle size distribution analyzer CP-50, 1 g of a sample and 5 ml of sodium hexametaphosphate (0.2% solution) were added to 100 ml of water,
Using a sample solution well dispersed for 10 minutes with an ultrasonic cleaner,
Measure the particle size distribution. The cumulative weight ratio was plotted against the particle size, and the particle size at which the cumulative weight ratio was 50% was defined as the central particle size. Ratio of particles having a particle size of 1 μm or more (%): From a particle size distribution measured with a central particle size, a weight ratio of a particle having a particle size of 1 μm or more was determined. BET specific surface area (m 2 / g): Using a specific surface area measuring device Monosorb manufactured by Cantachrome, 0.5 to 1 g of a sample is put in a sample cell, and degassed under N 2 / He (30/70) carrier gas flow. After (350 ° C., 15 minutes), the carrier gas is adsorbed at the temperature of liquid nitrogen. Thereafter, the temperature was raised to room temperature, and the amount of desorption was measured with a thermal conductivity detector to determine the BET specific surface area. (BET one-point method) Light transmission (%): Using a U-2000 spectrometer manufactured by Hitachi, Ltd. (light source-iodine tungsten lamp, detector-silicon diode), light source spot diameter 5.5 mm
The translucency was measured.
【００１６】実施例１ 原料として純度９９．９９％、粉末中１μｍ以上の粒子
の占める割合が７０％、ＢＥＴ比表面積４．２ｍ2／ｇ
の有機アルミニウム加水分解法により得られたα−アル
ミナを、前処理としてジェットミルで粉砕し、中心粒径
０．６μｍ、１μｍ以上の粒子の割合が１２％、ＢＥＴ
比表面積４．５ｍ2／ｇの粉末を得た。Example 1 The raw material had a purity of 99.99%, the ratio of particles having a particle size of 1 μm or more in the powder was 70%, and the BET specific surface area was 4.2 m 2 / g.
Α-alumina obtained by the organoaluminum hydrolysis method of Example 1 was pulverized with a jet mill as a pretreatment, and the ratio of particles having a center particle diameter of 0.6 μm, 1 μm or more was 12%, and BET
A powder having a specific surface area of 4.5 m 2 / g was obtained.
【００１７】このようにして得たアルミナ粉末１００部
と水４３部、有機分散剤（ポリカルボン酸アンモニウ
ム）０．５部を攪拌機で混合し、ダイノミル〔内容量５
リットル、ウィリー，エー，バフォーヘン社（Willy A.
Bachofen AG ) 製〕で湿式粉砕した。 粉砕条件は周速
１３ｍ／Ｈｒ、スラリー供給量５０リットル／Ｈｒ、粉
砕媒体としては０．６ｍｍφのジルコニア製ビーズ２．
４リットルを用いた。粉砕後に得られたアルミナ粉末
は、ＢＥＴ比表面積５．０ｍ2／ｇで、１μｍ以上の粒
子の割合が７％で不純物として０．１７％のＺｒＯ2を
含有していた。100 parts of the alumina powder thus obtained, 43 parts of water, and 0.5 part of an organic dispersant (ammonium polycarboxylate) were mixed with a stirrer, and the mixture was mixed with a Dynomill [content 5%].
Liter, Willy A. Bafochen
Bachofen AG)]. The grinding conditions were a peripheral speed of 13 m / Hr, a slurry supply rate of 50 L / Hr, and 0.6 mmφ zirconia beads as a grinding medium.
4 liters were used. The alumina powder obtained after the pulverization had a BET specific surface area of 5.0 m 2 / g, contained 7% of particles having a particle size of 1 μm or more, and contained 0.17% of ZrO 2 as an impurity.
【００１８】次いで湿式粉砕により得られたアルミナ粉
末に硝酸マグネシウムをＭｇＯ換算で０．０５％添加し
スプレードライ法により顆粒とした。得られた顆粒を
１．５ｔ／ｃｍ2の荷重で厚さ１．５ｍｍ、直径２０ｍ
ｍのペレットにプレス成形した後、電気炉で空気中９０
０℃、３Ｈｒ仮焼後、水素雰囲気炉で１８００℃、６Ｈ
ｒ焼成した。Next, magnesium nitrate was added to the alumina powder obtained by the wet pulverization in an amount of 0.05% in terms of MgO, and granulated by a spray drying method. The obtained granules were loaded under a load of 1.5 t / cm 2 to a thickness of 1.5 mm and a diameter of 20 m.
m pellets, and then in an electric furnace at 90
After calcination at 0 ° C and 3Hr, 1800 ° C and 6H in a hydrogen atmosphere furnace
b.
【００１９】得られた焼結体を両面ラッピングし、厚み
を０．８５ｍｍに調整した後、波長６００ｎｍの光を入
射し、透光性（直線透過率）を測定したところ３６％で
あった。After the obtained sintered body was wrapped on both sides and the thickness was adjusted to 0.85 mm, light having a wavelength of 600 nm was incident thereon, and the light transmittance (linear transmittance) was measured to be 36%.
【００２０】実施例２ 原料として純度９９．９９％、粉末中１μｍ以上の粒子
の占める割合が６５％、ＢＥＴ比表面積６．０ｍ2／ｇ
の有機アルミニウム加水分解法により得られたα−アル
ミナを実施例１と同様の条件でジェットミル粉砕、ダイ
ノミル湿式粉砕を行った。Example 2 Purity: 99.99% as raw material, 65% of particles having a particle size of 1 μm or more in powder, BET specific surface area: 6.0 m 2 / g
The α-alumina obtained by the organic aluminum hydrolysis method was subjected to jet mill pulverization and dyno mill wet pulverization under the same conditions as in Example 1.
【００２１】粉砕後に得られたアルミナ粉末は、ＢＥＴ
比表面積７．０ｍ2／ｇで、１μｍ以上の粒子の割合が
７％で不純物として０．２０％のＺｒＯ2を含有してい
た。The alumina powder obtained after the pulverization is BET
The particles had a specific surface area of 7.0 m 2 / g, a ratio of particles of 1 μm or more was 7%, and contained 0.20% of ZrO 2 as an impurity.
【００２２】実施例１と、同様の操作、条件によりアル
ミナ焼結体を作成し、透光性を評価したところ３４％で
あった。An alumina sintered body was prepared under the same operation and conditions as in Example 1, and the translucency was evaluated to be 34%.
【００２３】実施例３ 原料として純度９９．９９％、粉末中１μｍ以上の粒子
の占める割合が５０％、ＢＥＴ比表面積２６．０ｍ2／
ｇの有機アルミニウム加水分解法により得られたα−ア
ルミナとγ−アルミナの共存物を実施例１と同様の条件
でジェットミル粉砕、ダイノミル湿式粉砕を行った。Example 3 The raw material had a purity of 99.99%, the proportion of particles having a particle size of 1 μm or more in the powder was 50%, and the BET specific surface area was 26.0 m 2 /
g of a coexistent substance of α-alumina and γ-alumina obtained by the organic aluminum hydrolysis method were subjected to jet mill pulverization and dyno mill wet pulverization under the same conditions as in Example 1.
【００２４】粉砕後に得られたアルミナ粉末は、ＢＥＴ
比表面積２７．０ｍ2／ｇで、１μｍ以上の粒子の割合
が８％で不純物として０．２４％のＺｒＯ2を含有して
いた。得られた粉末を用い実施例１と、同様の操作、条
件によりアルミナ焼結体を作成し、透光性を評価したと
ころ３２％であった。The alumina powder obtained after the pulverization is BET
It had a specific surface area of 27.0 m 2 / g, a ratio of particles of 1 μm or more was 8%, and contained 0.24% of ZrO 2 as an impurity. Using the obtained powder, an alumina sintered body was prepared by the same operation and conditions as in Example 1, and the light transmittance was evaluated. As a result, it was 32%.
【００２５】比較例１ 原料としては純度９９．９９％、粉末中１μｍ以上の粒
子の占める割合が７０％、ＢＥＴ比表面積４．２ｍ2／
ｇの有機アルミニウム加水分解法により得られたα−ア
ルミナをジェットミル粉砕し、中心粒径０．６μｍ、粉
末中１μｍ以上の粒子の占める割合が１２％、ＢＥＴ比
表面積４．５ｍ2／ｇの粉末とした。得られた粉末を用
い実施例１と、同様の操作、条件によりアルミナ焼結体
を作成し透光性を評価したところ１８％であった。Comparative Example 1 The raw material had a purity of 99.99%, the ratio of particles having a particle size of 1 μm or more in the powder was 70%, and the BET specific surface area was 4.2 m 2 /
g of α-alumina obtained by the organoaluminum hydrolysis method is jet-milled to obtain a powder having a center particle diameter of 0.6 μm, a particle occupying 1 μm or more in the powder at a ratio of 12%, and a BET specific surface area of 4.5 m 2 / g. Powder. Using the obtained powder, an alumina sintered body was prepared under the same operation and conditions as in Example 1, and the light transmittance was evaluated. As a result, it was 18%.
【００２６】比較例２〜５ 表１に示す原料粉末、粉砕条件を用いた以外は実施例１
と、同様の操作、条件によりアルミナ焼結体を作成し、
透光性を評価した。その結果を表２に示す。 Comparative Examples 2 to 5 Example 1 was repeated except that the raw material powders and grinding conditions shown in Table 1 were used.
Alumina sintered body is made by the same operation and conditions,
The translucency was evaluated. Table 2 shows the results.
【００２７】 [0027]
【００３２】 [0032]
【００３３】[0033]
【発明の効果】このように本発明方法は特定の物性を有
するアルミナ粉末を特定粒径の粉砕媒体を用いて湿式粉
砕することにより、短時間でアルミナ粉末中の１μｍ以
上の粒子の占める割合を著しく減少せしめ得ることを可
能としたものであり、このようにして得られたアルミナ
粉末を用いる場合には従来法のアルミナ粉末を用いたも
のと比較し透光性に優れたアルミナ焼結体が得られるの
でその産業的利用価値は頗る大である。As described above, according to the method of the present invention, the ratio of particles having a particle size of 1 μm or more in the alumina powder can be reduced in a short time by wet-grinding the alumina powder having specific physical properties using a grinding medium having a specific particle size. It is possible to significantly reduce, when using the alumina powder obtained in this way, compared with those using the alumina powder of the conventional method, an alumina sintered body excellent in light transmission As such, its industrial use value is very large.
フロントページの続き (51)Int.Cl.7 識別記号 ＦＩ Ｃ０４Ｂ 35/626 Ｂ０２Ｃ 17/16 Ｂ // Ｂ０２Ｃ 17/16 Ｃ０４Ｂ 35/00 Ａ (56)参考文献 特開 昭63−174646（ＪＰ，Ａ) 特表 平３−500023（ＪＰ，Ａ) (58)調査した分野(Int.Cl.7，ＤＢ名) C04B 35/00 Continuation of the front page (51) Int.Cl. 7 Identification symbol FI C04B 35/626 B02C 17 / 16B // B02C 17/16 C04B 35 / 00A (56) References JP-A-63-174646 (JP, A ) Special table Hei 3-500023 (JP, A) (58) Fields investigated (Int. Cl. 7 , DB name) C04B 35/00
Claims (5)
１〜７０ｍ2／ｇのα−アルミナ又はα−アルミナと中
間アルミナよりなるアルミナ粉末をジェットミルで粉砕
し、次いで直径０．２ｍｍ〜５ｍｍの粉砕媒体を用いて
湿式粉砕することを特徴とする透光性アルミナ原料粉末
の製造方法。1. A jet mill of α-alumina having a BET specific surface area of 19.9 m 2 / g or a mixture of α-alumina and intermediate alumina having a purity of 99.9% or more.
And then performing wet pulverization using a pulverizing medium having a diameter of 0.2 mm to 5 mm.
０．３ｍｍ〜２ｍｍであることを特徴とする請求項１記
載の透光性アルミナ原料粉末の製造方法。2. The method for producing a translucent alumina raw material powder according to claim 1, wherein the diameter of the pulverizing medium used in the wet pulverization is 0.3 mm to 2 mm.
ナ製ビーズまたはジルコニア製ビーズであることを特徴
とする請求項１又は２記載の透光性アルミナ原料粉末の
製造方法。3. The method for producing a translucent alumina raw material powder according to claim 1 or 2, wherein the grinding media used in the wet milling is alumina beads or zirconia beads.
ルミニウムの加水分解法により得た純度９９．９％以
上、１μｍ以上の粗粒が１０〜１００％、ＢＥＴ比表面
積１〜７０ｍ2／ｇのα−アルミナ又はα−アルミナと
中間アルミナよりなるアルミナ粉末であることを特徴と
する請求項１〜３いずれか１項に記載の透光性アルミナ
原料粉末の製造方法。4. A powder having a BET specific surface area of 1 to 70 m 2 / g, wherein alumina powder to be subjected to wet pulverization has a purity of 99.9% or more and a coarse particle of 1 μm or more obtained by a hydrolysis method of organoaluminum of 10 to 100%. The method for producing a light-transmitting alumina raw material powder according to any one of claims 1 to 3 , wherein the powder is alumina powder composed of -alumina or α-alumina and intermediate alumina.
ルであることを特徴とする請求項１〜４いずれか１項に
記載の透光性アルミナ原料粉末の製造方法。5. The method for producing a translucent alumina raw material powder <br/> claim 1-4 any one of grinder characterized in that it is a medium agitating mill to apply to wet grinding.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3002617A JP3030875B2 (en) | 1991-01-14 | 1991-01-14 | Method for producing translucent alumina raw material powder |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3002617A JP3030875B2 (en) | 1991-01-14 | 1991-01-14 | Method for producing translucent alumina raw material powder |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH04238856A JPH04238856A (en) | 1992-08-26 |
| JP3030875B2 true JP3030875B2 (en) | 2000-04-10 |
Family
ID=11534368
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP3002617A Expired - Lifetime JP3030875B2 (en) | 1991-01-14 | 1991-01-14 | Method for producing translucent alumina raw material powder |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3030875B2 (en) |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4547770B2 (en) * | 2000-04-27 | 2010-09-22 | 住友化学株式会社 | Method for producing alumina powder |
| DE10108553C2 (en) * | 2001-02-22 | 2003-06-05 | Siemens Ag | Process for producing a scintillator ceramic and use of the scintillator ceramic |
| FI116657B (en) * | 2002-03-28 | 2006-01-31 | Focus Inhalation Oy | Method for treating carrier particles and their use |
| JP2007031163A (en) * | 2004-07-02 | 2007-02-08 | Showa Denko Kk | Method of producing aluminum oxide powder, and aluminum oxide powder |
| JP4932148B2 (en) * | 2004-10-18 | 2012-05-16 | 株式会社フジミインコーポレーテッド | Method for producing aluminum oxide powder |
| JP5678421B2 (en) * | 2009-09-09 | 2015-03-04 | 東ソー株式会社 | Powder for translucent alumina, method for producing the same, and method for producing translucent alumina sintered body using the same |
-
1991
- 1991-01-14 JP JP3002617A patent/JP3030875B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH04238856A (en) | 1992-08-26 |
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