JPS62231019A - Ceramic fiber having high acid resistance - Google Patents
Ceramic fiber having high acid resistanceInfo
- Publication number
- JPS62231019A JPS62231019A JP7035486A JP7035486A JPS62231019A JP S62231019 A JPS62231019 A JP S62231019A JP 7035486 A JP7035486 A JP 7035486A JP 7035486 A JP7035486 A JP 7035486A JP S62231019 A JPS62231019 A JP S62231019A
- Authority
- JP
- Japan
- Prior art keywords
- alumina
- fiber
- silica
- ceramic fiber
- acid resistance
- 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.)
- Pending
Links
- 239000000835 fiber Substances 0.000 title claims abstract description 41
- 239000002253 acid Substances 0.000 title claims abstract description 19
- 239000000919 ceramic Substances 0.000 title claims abstract description 19
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims abstract description 27
- 239000013078 crystal Substances 0.000 claims abstract description 15
- 239000000377 silicon dioxide Substances 0.000 claims abstract description 13
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims abstract description 11
- KZHJGOXRZJKJNY-UHFFFAOYSA-N dioxosilane;oxo(oxoalumanyloxy)alumane Chemical compound O=[Si]=O.O=[Si]=O.O=[Al]O[Al]=O.O=[Al]O[Al]=O.O=[Al]O[Al]=O KZHJGOXRZJKJNY-UHFFFAOYSA-N 0.000 claims abstract description 10
- 229910052863 mullite Inorganic materials 0.000 claims abstract description 10
- 239000002994 raw material Substances 0.000 abstract description 5
- 230000002378 acidificating effect Effects 0.000 abstract 1
- 239000011521 glass Substances 0.000 description 5
- 238000010438 heat treatment Methods 0.000 description 5
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 4
- 229910052906 cristobalite Inorganic materials 0.000 description 4
- 238000010828 elution Methods 0.000 description 4
- 150000002500 ions Chemical class 0.000 description 4
- 150000007513 acids Chemical class 0.000 description 3
- 229910052782 aluminium Inorganic materials 0.000 description 2
- -1 aluminum ions Chemical class 0.000 description 2
- 230000000052 comparative effect Effects 0.000 description 2
- 239000011222 crystalline ceramic Substances 0.000 description 2
- 229910002106 crystalline ceramic Inorganic materials 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000007664 blowing Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 239000012784 inorganic fiber Substances 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 239000011707 mineral Substances 0.000 description 1
- 238000012856 packing Methods 0.000 description 1
- 239000002244 precipitate Substances 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 238000009987 spinning Methods 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 238000004781 supercooling Methods 0.000 description 1
- 230000004580 weight loss Effects 0.000 description 1
Landscapes
- Inorganic Fibers (AREA)
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は、従来のセラミック繊維に比し結晶を主体とし
、耐酸性において格段に優れた一部ガラスよυなる結晶
質のセラミック繊維に関するものである。[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a crystalline ceramic fiber mainly composed of crystals and having a glass-like υ, which has much better acid resistance than conventional ceramic fibers. It is.
セラミックファイバー（以下、セラミック繊維ともいう
）は、アルミナとシリカを主体とした原料を高温で溶融
しこの融液をブローイングやスピニング法の繊維化方法
で繊維化される。前記いずれの方法に於いても０．１秒
以下の非常に短時間で繊維形成が行なわれ同時にほとん
ど常温まで急激に冷却される為過冷却されて繊維は非晶
質のガラス状態になる。Ceramic fibers (hereinafter also referred to as ceramic fibers) are produced by melting raw materials mainly consisting of alumina and silica at high temperatures, and using the molten liquid to form fibers by blowing or spinning. In any of the above methods, fiber formation takes place in a very short time of 0.1 seconds or less, and at the same time, the fiber is rapidly cooled to almost room temperature, resulting in supercooling and the fiber becomes an amorphous glass state.
このガラスを構成するシリカは網目形成酸化物である。The silica that makes up this glass is a network-forming oxide.
一方のアルミナは網目形成酸化物とこの網目の中に入る
修飾酸化物との両方の特性を有する両性酸化物であ夛、
このセラミックファイバーを模式的に示すと後に掲げる
第１図のようになる。このセラミックファイバーのＳｉ
イオン及び一部のＡＩイオンは網目を形成し酸に対し安
定である。また網目を形成しない一部のＡＩ３＋イオン
は３個の（０−）と電気的に約９合った状態で存在して
いるがこの網目を形成してないＡＩイオンは不安定な状
態であって酸に接触すると容易に溶出する性質がある。On the other hand, alumina is an amphoteric oxide that has the characteristics of both a network-forming oxide and a modified oxide that enters the network.
This ceramic fiber is schematically shown in Figure 1, which will be listed later. The Si of this ceramic fiber
The ions and some AI ions form a network and are stable against acids. In addition, some AI3+ ions that do not form a network exist in an electrically matched state of about 9 with three (0-), but these AI ions that do not form a network are in an unstable state. It has the property of being easily eluted when it comes into contact with acid.
この様に酸に浸漬されたセラミックファイバーは繊維形
体が維持されなくなる。この様な理由からセラミックフ
ァイバーは耐酸性ガスケット及びパツキン、酸溶液の濾
過材、蓄電池のセパレーター等の酸に晒される製品の原
材料として使用する事は不適であった。Ceramic fibers immersed in acid in this way no longer maintain their fiber shape. For these reasons, ceramic fibers are not suitable for use as raw materials for products that are exposed to acids, such as acid-resistant gaskets and packings, filtering materials for acid solutions, and separators for storage batteries.
また、他にシリカ繊維など耐酸性に優れた無機繊維があ
るが原料や製法上非常に高価なものであり、一部の分野
においてのみ使用されているに過ぎなかった。Additionally, there are other inorganic fibers with excellent acid resistance, such as silica fibers, but they are extremely expensive due to their raw materials and manufacturing methods, and have only been used in some fields.
本発明はこのよ、うな従来技術の欠点を解決することを
目的とし、前記特許請求の範囲記載の耐酸性セラミック
繊維を提供することによりその目的を達成するものであ
る。The present invention aims to solve these drawbacks of the prior art, and achieves its purpose by providing acid-resistant ceramic fibers as described in the claims.
〔問題を解決するだめの手段及び作用〕本発明は、過冷
却されたアルミナ、シリカ系のガラス質のセラミックフ
ァイバーを加熱処理してガラス構造すなわちガラスの網
目構造を形成してないアルミナをムライト結晶に変化し
耐酸性を付加した半結晶あるいは結晶質繊維のセラミッ
クファイバーに関するものである。以下本発明の詳細な
説明する。[Means and effects for solving the problem] The present invention heat-treats supercooled alumina and silica-based vitreous ceramic fibers to form mullite crystals from alumina that does not have a glass structure, that is, a glass network structure. This relates to semi-crystalline or crystalline ceramic fibers that have been modified to have acid resistance. The present invention will be explained in detail below.
本発明では、アルミナ、シリカ糸の非晶質のセラミック
ファイバーを熱処理してムライト結晶、クリストバライ
ト結晶とシリカを主体としたガラスよ構成る繊維とする
事により前記繊維を構成するアルミニウムイオンの酸溶
出を防止した。この熱処理によって得られる繊維の構造
を模式的に示すと後に掲げる図２のようになυ、構造的
に不安定な一部のアルミニウムイオンを熱処理によシ安
定なムライト結晶（３ＡＬＯ，・２ＳｉＯ，）に移行さ
せる事で酸溶出が飛躍的に抑制出来た。In the present invention, amorphous ceramic fibers such as alumina and silica threads are heat-treated to produce fibers mainly composed of mullite crystals, cristobalite crystals, and silica, thereby preventing acid elution of aluminum ions constituting the fibers. Prevented. The structure of the fiber obtained by this heat treatment is schematically shown in Figure 2, which will be listed later. ), acid elution was dramatically suppressed.
アルミナ・シリカ系の非晶質セラミックファイバーは加
熱すると９００℃〜１１００℃附近でムライト結晶が析
出し１１００℃〜１２５０℃附近で急激にその析出量が
増加し、１３００℃〜１４００℃附近でムライト結晶以
外にクリストバライト結晶が析出する。When alumina-silica-based amorphous ceramic fiber is heated, mullite crystals precipitate around 900°C to 1100°C, the amount of precipitation increases rapidly around 1100°C to 1250°C, and mullite crystals around 1300°C to 1400°C. In addition, cristobalite crystals are precipitated.
本発明ではアルミナ・シリカ系の非晶質セラミックファ
イバーを９００℃〜１４００℃の温度範囲内で熱処理し
てムライト結晶２０〜７０重量％と残部が、クリストバ
ライト結晶とシリカを主体とするガラスよυ成るファイ
バーとすることを好適とする。前記熱処理の温度が９０
０℃未満ではファイバーの中にムライト結晶の析出量が
少なく、構造的に不安定なアルミニウムイオンが多量に
存在するために、硫酸などの酸に対する溶出が起こる。In the present invention, alumina-silica-based amorphous ceramic fibers are heat-treated within a temperature range of 900°C to 1400°C, so that 20 to 70% by weight of mullite crystals and the balance are glass mainly composed of cristobalite crystals and silica. Preferably, it is a fiber. The temperature of the heat treatment is 90
At temperatures below 0°C, the amount of mullite crystals precipitated in the fiber is small, and a large amount of structurally unstable aluminum ions are present, so that elution with acids such as sulfuric acid occurs.
一方、１４００℃を越えるとファイバーの中に析出した
ムライト結晶あるいはクリストバライト結晶の粗大化が
起シ繊維の形態を維持できなくなる欠点があった。On the other hand, when the temperature exceeds 1,400°C, the mullite crystals or cristobalite crystals precipitated in the fibers become coarser and the fiber morphology cannot be maintained.
以下、本発明の実施例を比較例と共に示す。 Examples of the present invention will be shown below along with comparative examples.
化学組成がＡＩ、○＝ ４７．８ ％ 、５ｔＯ−５１
，９％ −Ｆｅａｒｓｏ、０６ ％ −Ｎａ−００，２
４’％ −ＣａＯＯ，０１％ −ＴｉＯ＊ ０．０２チ
であり、繊維径が平均径として２．０μであるアルミナ
・シリカ糸の非晶質セラミックファイバーをａ気炉にて
９００℃〜１４００℃の温度範囲にて所定時間熱処理し
た。前述の熱処理によシ得られたファイバーの鉱物組成
を第１表に示す。Chemical composition is AI, ○=47.8%, 5tO-51
,9%-Fearso,06%-Na-00,2
Amorphous ceramic fibers made of alumina-silica threads containing 4'% -CaOO, 01% -TiO* 0.02 and an average fiber diameter of 2.0μ are heated in an air furnace at 900°C to 1400°C. Heat treatment was performed for a predetermined time at a temperature range of . Table 1 shows the mineral composition of the fibers obtained by the heat treatment described above.
第１表
また前述の熱処理によシ得られたファイバーを温度８０
℃、比重１．２の硫酸に５時間浸漬し、その時のファイ
バーの重量減少量として酸溶出チを表わし、その結果を
第２表に示す。Table 1 also shows the fibers obtained by the heat treatment described above at a temperature of 80°C.
The fibers were immersed in sulfuric acid with a specific gravity of 1.2 for 5 hours at a temperature of 1.2°C, and the acid elution rate was expressed as the weight loss of the fiber at that time, and the results are shown in Table 2.
以上述べたように本発明によれば、耐酸性に優れ、酸雰
囲気中での用途の原材料として非常に有用なセラミック
ファイバーが得られる。As described above, according to the present invention, a ceramic fiber can be obtained which has excellent acid resistance and is very useful as a raw material for use in an acid atmosphere.
バーの化学構造を示す模式図である。FIG. 2 is a schematic diagram showing the chemical structure of a bar.
Claims (1)
からなる非晶質セラミック繊維を、９００〜１４００℃
の温度範囲で熱処理せしめ、前記アルミナ含有量の１４
％以上をムライト結晶にして成ることを特徴とする結晶
質の高耐酸性セラミック繊維。Amorphous ceramic fibers consisting of 40 to 72% by weight of alumina and 28 to 60% by weight of silica were heated at 900 to 1400°C.
The alumina content is 14.
A crystalline highly acid-resistant ceramic fiber characterized by comprising more than % of mullite crystals.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7035486A JPS62231019A (en) | 1986-03-27 | 1986-03-27 | Ceramic fiber having high acid resistance |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7035486A JPS62231019A (en) | 1986-03-27 | 1986-03-27 | Ceramic fiber having high acid resistance |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS62231019A true JPS62231019A (en) | 1987-10-09 |
Family
ID=13429013
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP7035486A Pending JPS62231019A (en) | 1986-03-27 | 1986-03-27 | Ceramic fiber having high acid resistance |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS62231019A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH03258909A (en) * | 1990-03-06 | 1991-11-19 | Matsushita Electric Ind Co Ltd | Diesel exhaust gas purifying device |
| EP1329601A1 (en) * | 2000-10-17 | 2003-07-23 | Ibiden Co., Ltd. | Holding seal material for catalytic converter and method of manufacturing the holding seal material |
| WO2004003276A1 (en) * | 2002-06-28 | 2004-01-08 | Denki Kagaku Kogyo Kabushiki Kaisha | Inorganic staple fiber accumulation for holding material, process for producing the same and holding material |
-
1986
- 1986-03-27 JP JP7035486A patent/JPS62231019A/en active Pending
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH03258909A (en) * | 1990-03-06 | 1991-11-19 | Matsushita Electric Ind Co Ltd | Diesel exhaust gas purifying device |
| EP1329601A1 (en) * | 2000-10-17 | 2003-07-23 | Ibiden Co., Ltd. | Holding seal material for catalytic converter and method of manufacturing the holding seal material |
| EP1329601A4 (en) * | 2000-10-17 | 2005-02-02 | Ibiden Co Ltd | Holding seal material for catalytic converter and method of manufacturing the holding seal material |
| EP1736644A1 (en) * | 2000-10-17 | 2006-12-27 | Ibiden Co., Ltd. | Holding and sealing material for catalytic converter and corresponding manufacturing method |
| EP1757782A3 (en) * | 2000-10-17 | 2007-03-07 | Ibiden Co., Ltd. | Holding and sealing material for catalyc converter and corresponding manufacturing method |
| WO2004003276A1 (en) * | 2002-06-28 | 2004-01-08 | Denki Kagaku Kogyo Kabushiki Kaisha | Inorganic staple fiber accumulation for holding material, process for producing the same and holding material |
| US7182999B2 (en) | 2002-06-28 | 2007-02-27 | Denki Kagaku Kogyo Kabushiki Kaisha | Inorganic staple fiber accumulation for holding material, process for producing the same and holding material |
| CN100359071C (en) * | 2002-06-28 | 2008-01-02 | 电气化学工业株式会社 | Inorganic short fiber aggregate for fixing material, method for producing same, and fixing material |
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