JP2000160434A - High purity alumina filament and its fiber product and fire-resistant insulating material - Google Patents
High purity alumina filament and its fiber product and fire-resistant insulating materialInfo
- Publication number
- JP2000160434A JP2000160434A JP10347981A JP34798198A JP2000160434A JP 2000160434 A JP2000160434 A JP 2000160434A JP 10347981 A JP10347981 A JP 10347981A JP 34798198 A JP34798198 A JP 34798198A JP 2000160434 A JP2000160434 A JP 2000160434A
- Authority
- JP
- Japan
- Prior art keywords
- alumina
- purity alumina
- fiber
- fire
- filament
- 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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Classifications
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B14/00—Use of inorganic materials as fillers, e.g. pigments, for mortars, concrete or artificial stone; Treatment of inorganic materials specially adapted to enhance their filling properties in mortars, concrete or artificial stone
- C04B14/38—Fibrous materials; Whiskers
- C04B14/46—Rock wool ; Ceramic or silicate fibres
- C04B14/4618—Oxides
- C04B14/4625—Alumina
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Ceramic Engineering (AREA)
- Civil Engineering (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Inorganic Fibers (AREA)
- Woven Fabrics (AREA)
- Porous Artificial Stone Or Porous Ceramic Products (AREA)
- Compositions Of Oxide Ceramics (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、不純物の少ない高
純度のアルミナ長繊維、アルミナ長繊維を主材とする繊
維製品、及び、耐火性短繊維を主材とする耐火繊維体で
構成した耐火断熱材に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a high-purity alumina long fiber containing few impurities, a fiber product mainly composed of alumina long fiber, and a fire-resistant fiber composed mainly of fire-resistant short fiber. It is related to thermal insulation.
【０００２】[0002]
【従来の技術】アルミナ長繊維は、一般に６０〜１００
重量％程度のＡｌ2 Ｏ3 （アルミナ）を含む直径５〜２
０μｍの連続繊維である。アルミナ長繊維はアルミナと
シリカを主成分として形成され、場合により酸化硼素や
酸化錫を含有する。2. Description of the Related Art Alumina filaments are generally 60 to 100.
5 to 2 in diameter containing about 2 % by weight of Al 2 O 3 (alumina)
It is a continuous fiber of 0 μm. Alumina long fibers are formed mainly of alumina and silica, and optionally contain boron oxide or tin oxide.
【０００３】アルミナ長繊維は、溶液の原料を紡糸して
前駆体繊維とし、この前駆体繊維を加熱処理により緻密
化および結晶化させ、繊維の強度を発現させる。この結
晶相は中間アルミナ（γアルミナ、δアルミナ、θアル
ミナ）である。中間アルミナは、使用の際の加熱により
コランダムあるいはムライトに変化する。繊維中にコラ
ンダムやムライトの結晶が析出すると、強度が著しく低
下する。このような繊維でも、短時間であれば１４００
℃前後の温度で使用できる。[0003] Alumina long fibers are obtained by spinning a raw material of a solution into precursor fibers, and the precursor fibers are densified and crystallized by a heat treatment to develop the fiber strength. This crystal phase is an intermediate alumina (γ alumina, δ alumina, θ alumina). Intermediate alumina changes to corundum or mullite due to heating during use. When crystals of corundum or mullite precipitate in the fiber, the strength is significantly reduced. Even for such fibers, if it is short, 1400
Can be used at temperatures around ° C.
【０００４】アルミナ長繊維は、このような特性によ
り、ＦＲＰやＦＲＭなどにそのまま補強繊維として使わ
れたり、或いは、アルミナ長繊維を数百本纏めてヤーン
とし、このヤーンからクロス等の織布に加工され、繊維
製品として使用されている。Due to such properties, alumina filaments are used as reinforcement fibers in FRP or FRM as they are, or hundreds of alumina filaments are combined into a yarn, and the yarn is converted into a cloth such as cloth. Processed and used as textile products.
【０００５】さらに、アルミナ長繊維クロスは、耐火断
熱材の粉塵防止にも用いられる。すなわち、短繊維を主
材とする成形品の表面をこのクロスで覆って、短繊維成
形品から発生する粉塵を防止するのである。[0005] Furthermore, the alumina long fiber cloth is also used for dust prevention of a refractory heat insulating material. That is, the surface of the molded article mainly composed of short fibers is covered with the cloth to prevent dust generated from the short fiber molded article.
【０００６】[0006]
【発明が解決しようとする課題】しかしながら、従来の
アルミナ長繊維を、耐火断熱材として高温で長期間使用
すると、繊維の結晶成長が進み、強度や耐熱性の低下が
生じ易かった。その場合、アルミナ長繊維は、脆くなっ
て破断し易くなる。そして、粉塵が発生し、炉内の被加
熱物が汚染される。However, when the conventional alumina long fiber is used as a refractory heat insulating material at a high temperature for a long period of time, the crystal growth of the fiber proceeds, and the strength and the heat resistance are likely to be reduced. In that case, the alumina long fibers become brittle and easily broken. Then, dust is generated, and the object to be heated in the furnace is contaminated.
【０００７】最近は、様々な工業製品の高品質化が進ん
でおり、工業炉等においても汚染を完全に防止すること
が望まれている。Recently, the quality of various industrial products has been improved, and it has been desired to completely prevent contamination in industrial furnaces and the like.
【０００８】本発明は、強度の劣化が小さく、耐熱性に
優れ、被熱処理物の汚染源とならない高純度のアルミナ
長繊維、及び、そのような繊維製品と耐火断熱材を提供
することを目的としている。SUMMARY OF THE INVENTION An object of the present invention is to provide a high-purity alumina filament which has a small deterioration in strength, is excellent in heat resistance and does not become a source of contamination of an object to be heat-treated, and to provide such a fiber product and a fire-resistant heat insulating material. I have.
【０００９】[0009]
【課題を解決するための手段】本発明の解決手段は、Ａ
ｌ2 Ｏ3 が６０〜１００重量％であるアルミナ長繊維に
おいて、ＮａとＫの含有量の合計が５００ｐｐｍ以下で
あり、Ｆｅの含有量が３００ｐｐｍ以下であることを特
徴とする高純度アルミナ長繊維である。Means for Solving the Problems The solution of the present invention is as follows.
2. A high-purity alumina filament having a total content of Na and K of 500 ppm or less and an Fe content of 300 ppm or less in an alumina filament having an l 2 O 3 of 60 to 100% by weight. It is.
【００１０】本発明の他の解決手段は、アルミナ長繊維
を主材として形成される繊維製品において、アルミナ長
繊維が前記高純度アルミナ長繊維であることを特徴とす
る繊維製品である。[0010] Another solution of the present invention is a fiber product formed mainly of alumina filaments, wherein the alumina filaments are the high-purity alumina filaments.
【００１１】本発明のさらに他の解決手段は、耐火性短
繊維を主材とする耐火繊維体で構成した耐火断熱材にお
いて、耐火繊維体の表面を、前記高純度アルミナ長繊維
のクロスによって覆ったことを特徴とする耐火断熱材で
ある。[0011] Still another solution of the present invention is a refractory heat insulating material comprising a refractory fiber mainly composed of refractory short fibers, wherein the surface of the refractory fiber is covered with the cloth of the high-purity alumina filament. It is a fire-resistant heat insulating material characterized by the following.
【００１２】[0012]
【発明の実施の形態】本発明者達は、鋭意研究の結果、
アルミナ長繊維の加熱に伴う結晶成長による劣化が、主
にＮａ、Ｋ、Ｆｅ、Ｃａ、Ｃｕ、Ｎｉ等の不純物に起因
することを知見して、本発明を完成させた。BEST MODE FOR CARRYING OUT THE INVENTION The present inventors have conducted intensive studies,
The present invention was completed by finding that deterioration due to crystal growth due to heating of alumina long fibers is mainly caused by impurities such as Na, K, Fe, Ca, Cu, and Ni.
【００１３】すなわち、アルミナ長繊維に所定比率を超
えるＮａ、Ｋ、Ｆｅが含まれると、繊維の結晶成長が著
しく促進されることが判明した。そのうち、ＮａとＫ
は、その合計が所定比率を超えると、繊維の結晶成長が
著しく促進される。[0013] That is, it has been found that when alumina long fibers contain Na, K, and Fe in excess of a predetermined ratio, the crystal growth of the fibers is remarkably promoted. Of which Na and K
When the total exceeds a predetermined ratio, the crystal growth of the fiber is remarkably promoted.
【００１４】また、所定比率以上のＣａがアルミナ長繊
維に含まれると、Ｎａ、Ｋ、Ｆｅの場合と同様に、繊維
の結晶成長が促進されることも確認された。[0014] It was also confirmed that when a predetermined ratio or more of Ca is contained in the alumina filament, the crystal growth of the fiber is promoted as in the case of Na, K, and Fe.
【００１５】さらに、アルミナ長繊維に含まれるＣｕ、
Ｎｉの挙動は、明確に解明できていないが、これらは、
繊維を製造する際に拡散移動して繊維表面に濃縮してい
ると考えられる。そのため、Ｃｕ、Ｎｉは、繊維全体に
含まれる量がそれぞれ僅かであっても、繊維の結晶成長
を局部的に促進するものと推定される。Further, Cu contained in alumina long fiber,
Although the behavior of Ni has not been clearly elucidated,
It is considered that when the fiber is manufactured, it diffuses and moves to concentrate on the fiber surface. Therefore, it is presumed that Cu and Ni locally promote the crystal growth of the fiber even if the amounts contained in the entire fiber are small.
【００１６】以上の理由により、本発明の高純度アルミ
ナ長繊維が含有する不純物の量は、ＮａとＫが合計で５
００ｐｐｍ以下、Ｆｅが３００ｐｐｍ以下である。より
好ましくは、ＮａとＫは合計で３００ｐｐｍ以下、Ｆｅ
は２００ｐｐｍ以下とする。For the above reasons, the amount of impurities contained in the high-purity alumina filament of the present invention is such that Na and K are 5
00 ppm or less and Fe is 300 ppm or less. More preferably, the total of Na and K is 300 ppm or less,
Is 200 ppm or less.
【００１７】また、Ｃａの含有量は５０ｐｐｍ以下が好
ましい。より好ましくは、Ｃａは２０ｐｐｍ以下とす
る。Further, the content of Ca is preferably 50 ppm or less. More preferably, Ca is set to 20 ppm or less.
【００１８】また、Ｃｕの含有量は２ｐｐｍ以下、Ｎｉ
の含有量は４ｐｐｍ以下とするのが好ましい。より好ま
しくは、Ｃｕは１ｐｐｍ以下、Ｎｉは２ｐｐｍ以下とす
る。The Cu content is 2 ppm or less,
Is preferably 4 ppm or less. More preferably, Cu is 1 ppm or less and Ni is 2 ppm or less.
【００１９】不純物の含有量が前述の値を越えると、使
用の際に、結晶成長による繊維の劣化が大きく、強度お
よび耐熱性が著しく低下する恐れがある。さらに、被加
熱物の汚染の原因となり易い。When the content of the impurities exceeds the above-mentioned value, the fibers are greatly deteriorated due to crystal growth during use, and the strength and heat resistance may be significantly reduced. Furthermore, it is likely to cause contamination of the object to be heated.
【００２０】アルミナ長繊維は、アルミナ原料、シリカ
原料、繊維化助材の溶液を所定量混合し、濃縮や加水分
解により混合溶液の粘性を調整して、この溶液を繊維化
した後、約１２００℃に加熱して製造できる。Alumina filaments are prepared by mixing a predetermined amount of a solution of an alumina raw material, a silica raw material, and a fiberizing aid, adjusting the viscosity of the mixed solution by concentration or hydrolysis, and fiberizing the solution. It can be manufactured by heating to ℃.
【００２１】本発明に使用するアルミナ原料としては、
例えば塩基性塩化アルミニウムなどのアルミニウム塩化
物、硝酸塩などの無機酸塩、酢酸塩などの有機酸塩、ア
ルミニウムのアルコキシド溶液などが好ましい。The alumina raw material used in the present invention includes:
For example, aluminum chloride such as basic aluminum chloride, inorganic acid salt such as nitrate, organic acid salt such as acetate, alkoxide solution of aluminum and the like are preferable.
【００２２】本発明に使用するシリカ原料としては、例
えばコロイダルシリカ、水溶性シリコーン、シリコンの
アルコキシド溶液などが好ましい。As the silica raw material used in the present invention, for example, colloidal silica, water-soluble silicone, alkoxide solution of silicon and the like are preferable.
【００２３】本発明に使用する繊維化助材としては、例
えば乳酸やポリビニルアルコールなどの水分散性の有機
重合体が好ましい。As the fiberizing aid used in the present invention, a water-dispersible organic polymer such as lactic acid or polyvinyl alcohol is preferable.
【００２４】アルコキシド溶液は、比較的不純物は少な
いが、高価なためにコスト的な観点から使用が制限され
る。一方、塩基性塩化アルミニウムやコロイダルシリ
カ、水溶性シリコーンなどは、不純物は多いが、安価な
ために多く使用される。Although the alkoxide solution has relatively few impurities, its use is limited from the viewpoint of cost because it is expensive. On the other hand, basic aluminum chloride, colloidal silica, water-soluble silicone and the like have many impurities, but are often used because they are inexpensive.
【００２５】不純物の多い原料から不純物を除去する方
法としては、イオン交換樹脂法がある。この方法によれ
ば、アルカリイオンや金属イオンなどを除去することが
できる。この処理は、原料を混合する前でも、混合した
後でも良い。As a method for removing impurities from a raw material containing many impurities, there is an ion exchange resin method. According to this method, alkali ions and metal ions can be removed. This treatment may be performed before or after mixing the raw materials.
【００２６】本発明の高純度アルミナ長繊維は、例えば
アルコキシド溶液やイオン交換樹脂法を用いた原料を組
合わせて製造できる。The high-purity alumina filament of the present invention can be produced by combining raw materials using, for example, an alkoxide solution or an ion exchange resin method.
【００２７】本発明の繊維製品は、高純度のアルミナ長
繊維を主な構成材料とする製品である。例えば、高純度
のアルミナ長繊維を数百本纏めたヤーン、このヤーンを
編んだ紐またはロープ、このヤーンを織ったクロス等の
織布などがある。これらの製造に際しては、収束材や織
機などから不純物が混入しないように製造手段を限定し
て使用することが好ましい。The fiber product of the present invention is a product mainly composed of high-purity alumina long fibers. For example, there are a yarn obtained by gathering hundreds of high-purity alumina filaments, a string or a rope obtained by knitting the yarn, and a woven cloth such as a cloth woven from the yarn. In the production, it is preferable to use a limited production means so that impurities are not mixed in from a converging material or a loom.
【００２８】本発明の耐火断熱材は、アルミナシリカ質
短繊維に代表される短繊維の耐火繊維を主材とする耐火
繊維体の表面を、前述した本発明の高純度アルミナ長繊
維からなるクロスで覆ったものである。The refractory heat-insulating material of the present invention is obtained by coating the surface of a refractory fiber mainly composed of refractory fibers of short fibers typified by alumina-silica short fibers with a cloth made of the above-described high-purity alumina filaments of the present invention. It is covered with.
【００２９】耐火性の短繊維はその製造方法に起因して
ショットを含んでおり、粉塵発生の原因の一つとなって
いる。そこで、本発明の高純度アルミナ長繊維のクロス
で、耐火性短繊維を主材とする成形品（耐火繊維体）を
覆うことにより、粉塵の発生を抑制すると共に、不純物
の揮発による汚染を少なくすることができる。Refractory staple fibers contain shots due to their production method, which is one of the causes of dust generation. Therefore, by covering the molded article (fire-resistant fiber body) mainly composed of fire-resistant short fibers with the cloth of the high-purity alumina long fiber of the present invention, the generation of dust is suppressed, and the contamination due to the volatilization of impurities is reduced. can do.
【００３０】[0030]
【実施例】実施例１〜４ 塩基性塩化アルミニウム溶液（Ａ１／Ｃ１＝１．７、Ａ
ｌ2 Ｏ3 固形分２３．５％）６２重量部と、低ソーダの
コロイダルシリカ（ＳｉＯ2 固形分２０．０％）２８重
量部と、これらの溶液をイオン交換樹脂法により高純度
化した溶液６２重量部または２８重量部から選択した溶
液と、乳酸（濃度５０％）１０重量部を混合した。さら
に、必要に応じて、Ｃａ、Ｃｕ、Ｎｉ等を含む試薬を添
加した。EXAMPLES Examples 1 to 4 Basic aluminum chloride solution (A1 / C1 = 1.7, A
62 parts by weight of l 2 O 3 solid content 23.5%), 28 parts by weight of low soda colloidal silica (SiO 2 solid content 20.0%), and a solution obtained by purifying these solutions by an ion exchange resin method. A solution selected from 62 parts by weight or 28 parts by weight was mixed with 10 parts by weight of lactic acid (concentration: 50%). Further, a reagent containing Ca, Cu, Ni or the like was added as needed.
【００３１】この混合液を濃縮して、粘度を約２０００
ポイズに調整した。この液を径０．１ｍｍのノズルから
押出して繊維化し、乾燥後、１２００℃で３０分間加熱
して直径１０μｍであり、Ａｌ2 Ｏ3 含有率が７２重量
％の高純度アルミナ長繊維を得た。The mixture is concentrated to a viscosity of about 2000
Adjusted to poise. This liquid was extruded from a nozzle having a diameter of 0.1 mm into fibers, dried, and heated at 1200 ° C. for 30 minutes to obtain high-purity alumina long fibers having a diameter of 10 μm and an Al 2 O 3 content of 72% by weight. .
【００３２】塩基性塩化アルミニウム溶液、低ソーダの
コロイダルシリカ、乳酸の不純物量の分析値を表１に示
す。Table 1 shows the analytical values of the impurities of the basic aluminum chloride solution, low soda colloidal silica, and lactic acid.
【００３３】高純度アルミナ長繊維の使用原料、不純物
の量および特性を表２に示す。Table 2 shows raw materials used, amounts of impurities and characteristics of the high-purity alumina filaments.
【００３４】高純度アルミナ長繊維の特性は、以下の試
験方法でテストしたものである。The properties of the high-purity alumina filaments were tested by the following test methods.
【００３５】引張強度は、厚さ０．３ｍｍ、巾２５ｍｍ
の綾織りのクロスの破断荷重を測定した。The tensile strength is 0.3 mm thick and 25 mm wide.
The breaking load of the twill cloth was measured.
【００３６】加熱収縮率は、巾２５ｍｍ、長さ１００ｍ
ｍの綾織りのクロスの長さ方向の収縮率を測定した。The heat shrinkage is 25 mm in width and 100 m in length.
The shrinkage in the length direction of the t-woven cloth of m was measured.
【００３７】汚染反応性は、粉砕したアルミナ長繊維
０．３ｇを石英ガラス板の上の約３０ｍｍ角に置いて、
１０００℃で６時間加熱し、石英ガラスの失透を観察し
た。失透の程度により、無、微小、小、中、大の５段階
にわけて評価した。失透が大きい程、汚染が多くなる。Contamination reactivity was measured by placing 0.3 g of crushed alumina long fibers on a quartz glass plate in a square of about 30 mm.
After heating at 1000 ° C. for 6 hours, devitrification of the quartz glass was observed. Depending on the degree of devitrification, evaluation was made in five stages: none, minute, small, medium, and large. The greater the devitrification, the greater the contamination.
【００３８】比較例１〜２ 実施例１〜４と同様にして、比較例１〜２の長繊維を製
造した。ただし、実施例１〜４に比べて、意図的に不純
物が多く含まれるようにした。[0038] In the same manner as in Comparative Examples 1-2 Examples 1-4 were prepared long fibers of Comparative Examples 1-2. However, compared with Examples 1 to 4, intentionally more impurities were included.
【００３９】比較例１〜２は、表２に示すように、Ｎ
ａ、Ｋ、Ｃａ、Ｃｕ、Ｎｉの含有量が多く、引張強度が
劣っており、加熱収縮が大きく、汚染が多かった。In Comparative Examples 1 and 2, as shown in Table 2, N
The content of a, K, Ca, Cu, Ni was large, the tensile strength was inferior, the heat shrinkage was large, and the contamination was large.
【００４０】[0040]
【表１】 [Table 1]
【００４１】[0041]
【表２】 [Table 2]
【００４２】[0042]
【発明の効果】本発明の高純度アルミナ長繊維およびそ
の繊維製品は、優れた耐熱性を備え、高温での繊維の強
度劣化が小さく、被加熱物との汚染反応性が少ないなど
の効果を奏する。The high-purity alumina filament and the fiber product of the present invention have excellent heat resistance, have a small strength deterioration of the fiber at a high temperature, and have a low contamination reactivity with an object to be heated. Play.
【００４３】このような特長により、本発明の高純度ア
ルミナ長繊維、繊維製品および耐火断熱材を使用すれ
ば、被加熱物を汚染することがなく、安全に長時間の使
用ができ、被加熱物の品質向上と生産量の向上が可能と
なる。Because of these features, the use of the high-purity alumina filament, the fiber product, and the refractory heat-insulating material of the present invention makes it possible to safely and prolong the use without contaminating the object to be heated. It is possible to improve the quality of products and the production volume.
【００４４】特に、本発明の耐火断熱材は、粉塵や不純
物の揮発による汚染が少ないので、高純度を必要とする
例えば石英ガラスや半導体材料との併用に好適である。In particular, the refractory heat insulating material of the present invention is suitable for being used in combination with, for example, quartz glass or a semiconductor material which requires high purity, since it has little pollution due to dust and evaporation of impurities.
フロントページの続き Ｆターム(参考） 4G019 EA09 4G030 AA03 AA04 AA08 AA27 AA29 AA31 AA36 AA37 BA22 CA08 4L037 CS18 CS22 FA01 FA15 PA40 PA43 PS02 UA06 UA07 4L048 AA02 AA53 AB01 AB07 AC14 BA01 BA02 CA06 DA24 Continued on front page F term (reference) 4G019 EA09 4G030 AA03 AA04 AA08 AA27 AA29 AA31 AA36 AA37 BA22 CA08 4L037 CS18 CS22 FA01 FA15 PA40 PA43 PS02 UA06 UA07 4L048 AA02 AA53 AB01 AB07 AC14 BA01 BA02 CA06 DA24
Claims (5)
アルミナ長繊維において、ＮａとＫの含有量の合計が５
００ｐｐｍ以下であり、Ｆｅの含有量が３００ｐｐｍ以
下であることを特徴とする高純度アルミナ長繊維。1. In an alumina continuous fiber having an Al 2 O 3 content of 60 to 100% by weight, the total content of Na and K is 5%.
A high-purity alumina filament having a Fe content of not more than 00 ppm and an Fe content of not more than 300 ppm.
とを特徴とする請求項１に記載の高純度アルミナ長繊
維。2. The high-purity alumina filament according to claim 1, wherein the content of Ca is 50 ppm or less.
有量が４ｐｐｍ以下であることを特徴とする請求項２に
記載の高純度アルミナ長繊維。3. The high-purity alumina filament according to claim 2, wherein the content of Cu is 2 ppm or less and the content of Ni is 4 ppm or less.
繊維製品において、アルミナ長繊維が請求項１〜３のい
ずれか１項に記載された高純度アルミナ長繊維であるこ
とを特徴とする繊維製品。4. A fiber product formed mainly of alumina filaments, wherein the alumina filaments are the high-purity alumina filaments according to any one of claims 1 to 3. Product.
構成した耐火断熱材において、耐火繊維体の表面を、請
求項１〜３のいずれか１項に記載の高純度アルミナ長繊
維のクロスによって覆ったことを特徴とする耐火断熱
材。5. A high-purity alumina filament according to any one of claims 1 to 3, wherein the surface of the refractory fiber is made of a high-purity alumina filament according to claim 1. Fire resistant insulation covered with a cloth.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10347981A JP2000160434A (en) | 1998-11-24 | 1998-11-24 | High purity alumina filament and its fiber product and fire-resistant insulating material |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10347981A JP2000160434A (en) | 1998-11-24 | 1998-11-24 | High purity alumina filament and its fiber product and fire-resistant insulating material |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JP2000160434A true JP2000160434A (en) | 2000-06-13 |
Family
ID=18393937
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP10347981A Pending JP2000160434A (en) | 1998-11-24 | 1998-11-24 | High purity alumina filament and its fiber product and fire-resistant insulating material |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2000160434A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6348428B1 (en) * | 1999-02-23 | 2002-02-19 | Toshiba Monofrax Co., Ltd. | High-purity crystalline inorganic fiber, molded body thereof, and method of production thereof |
| JP2003002731A (en) * | 2001-06-20 | 2003-01-08 | Toshiba Monofrax Co Ltd | Alumina fiber block and production method therefor |
| WO2019038747A1 (en) | 2017-08-25 | 2019-02-28 | デンカ株式会社 | Alumina fibers, alumina fiber aggregate, and retaining material for use in exhaust gas purification device |
| JP2019039107A (en) * | 2017-08-25 | 2019-03-14 | デンカ株式会社 | Alumina fibers, alumina fiber aggregate, and retaining material for use in exhaust gas purification device |
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| JPS62206021A (en) * | 1986-03-06 | 1987-09-10 | Nippon Light Metal Co Ltd | Production of alumina based filament |
| JPH01298018A (en) * | 1988-05-25 | 1989-12-01 | Nippon Light Metal Co Ltd | Production of alumina having high purity |
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6348428B1 (en) * | 1999-02-23 | 2002-02-19 | Toshiba Monofrax Co., Ltd. | High-purity crystalline inorganic fiber, molded body thereof, and method of production thereof |
| JP2003002731A (en) * | 2001-06-20 | 2003-01-08 | Toshiba Monofrax Co Ltd | Alumina fiber block and production method therefor |
| WO2019038747A1 (en) | 2017-08-25 | 2019-02-28 | デンカ株式会社 | Alumina fibers, alumina fiber aggregate, and retaining material for use in exhaust gas purification device |
| JP2019039106A (en) * | 2017-08-25 | 2019-03-14 | デンカ株式会社 | Alumina fibers, alumina fiber aggregate, and retaining material for use in exhaust gas purification device |
| JP2019039107A (en) * | 2017-08-25 | 2019-03-14 | デンカ株式会社 | Alumina fibers, alumina fiber aggregate, and retaining material for use in exhaust gas purification device |
| EP3623505A4 (en) * | 2017-08-25 | 2020-07-15 | Denka Company Limited | Alumina fibers, alumina fiber aggregate, and retaining material for use in exhaust gas purification device |
| EP3623504A4 (en) * | 2017-08-25 | 2020-07-15 | Denka Company Limited | Alumina fibers, alumina fiber aggregate, and retaining material for use in exhaust gas purification device |
| US11319250B2 (en) | 2017-08-25 | 2022-05-03 | Denka Company Limited | Alumina fibers, alumina fiber aggregate, and retaining material for use in exhaust gas purification device |
| US11345641B2 (en) | 2017-08-25 | 2022-05-31 | Denka Company Limited | Alumina fibers, alumina fiber aggregate, and retaining material for use in exhaust gas purification device |
| JP7258458B2 (en) | 2017-08-25 | 2023-04-17 | デンカ株式会社 | Alumina fiber, alumina fiber assembly and gripping material for exhaust gas purifier |
| JP7258457B2 (en) | 2017-08-25 | 2023-04-17 | デンカ株式会社 | Alumina fiber, alumina fiber assembly and gripping material for exhaust gas purifier |
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