JP7180713B2 - アルミナ繊維集合体及びその製造方法 - Google Patents
アルミナ繊維集合体及びその製造方法 Download PDFInfo
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- JP7180713B2 JP7180713B2 JP2021090327A JP2021090327A JP7180713B2 JP 7180713 B2 JP7180713 B2 JP 7180713B2 JP 2021090327 A JP2021090327 A JP 2021090327A JP 2021090327 A JP2021090327 A JP 2021090327A JP 7180713 B2 JP7180713 B2 JP 7180713B2
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- Prior art keywords
- alumina
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- alumina fiber
- fiber
- fibers
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- 239000000835 fiber Substances 0.000 title claims description 250
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 title claims description 167
- 238000004519 manufacturing process Methods 0.000 title description 9
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 26
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 16
- 239000000463 material Substances 0.000 claims description 13
- 239000000377 silicon dioxide Substances 0.000 claims description 13
- 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 description 10
- 239000000203 mixture Substances 0.000 claims description 10
- 229910052863 mullite Inorganic materials 0.000 claims description 10
- 239000011148 porous material Substances 0.000 claims description 9
- 239000000126 substance Substances 0.000 claims description 8
- 238000006243 chemical reaction Methods 0.000 claims description 5
- 238000004140 cleaning Methods 0.000 claims description 3
- 238000009987 spinning Methods 0.000 description 77
- 239000000243 solution Substances 0.000 description 48
- 229920002451 polyvinyl alcohol Polymers 0.000 description 44
- 235000019422 polyvinyl alcohol Nutrition 0.000 description 44
- 239000004372 Polyvinyl alcohol Substances 0.000 description 41
- 238000000034 method Methods 0.000 description 26
- 238000007127 saponification reaction Methods 0.000 description 22
- 238000006116 polymerization reaction Methods 0.000 description 20
- 238000007906 compression Methods 0.000 description 17
- 230000006835 compression Effects 0.000 description 17
- 238000009826 distribution Methods 0.000 description 17
- RMAQACBXLXPBSY-UHFFFAOYSA-N silicic acid Chemical compound O[Si](O)(O)O RMAQACBXLXPBSY-UHFFFAOYSA-N 0.000 description 17
- 238000010304 firing Methods 0.000 description 16
- 239000007789 gas Substances 0.000 description 16
- 239000002243 precursor Substances 0.000 description 16
- 239000002245 particle Substances 0.000 description 15
- 239000003054 catalyst Substances 0.000 description 10
- 238000005259 measurement Methods 0.000 description 10
- 239000007864 aqueous solution Substances 0.000 description 9
- VSCWAEJMTAWNJL-UHFFFAOYSA-K aluminium trichloride Chemical compound Cl[Al](Cl)Cl VSCWAEJMTAWNJL-UHFFFAOYSA-K 0.000 description 8
- 239000007788 liquid Substances 0.000 description 8
- 238000011156 evaluation Methods 0.000 description 7
- 230000000704 physical effect Effects 0.000 description 7
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 description 6
- 230000005484 gravity Effects 0.000 description 6
- 230000014759 maintenance of location Effects 0.000 description 5
- 230000010349 pulsation Effects 0.000 description 5
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 4
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 4
- 230000008020 evaporation Effects 0.000 description 4
- 238000001704 evaporation Methods 0.000 description 4
- 238000002360 preparation method Methods 0.000 description 4
- 238000001179 sorption measurement Methods 0.000 description 4
- 229910052782 aluminium Inorganic materials 0.000 description 3
- 238000004458 analytical method Methods 0.000 description 3
- 238000007664 blowing Methods 0.000 description 3
- 230000000052 comparative effect Effects 0.000 description 3
- 229920006240 drawn fiber Polymers 0.000 description 3
- 238000010438 heat treatment Methods 0.000 description 3
- 238000003756 stirring Methods 0.000 description 3
- 229910004298 SiO 2 Inorganic materials 0.000 description 2
- 230000006866 deterioration Effects 0.000 description 2
- 238000001035 drying Methods 0.000 description 2
- 238000002296 dynamic light scattering Methods 0.000 description 2
- 239000012784 inorganic fiber Substances 0.000 description 2
- 238000000691 measurement method Methods 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 239000004570 mortar (masonry) Substances 0.000 description 2
- 229910052757 nitrogen Inorganic materials 0.000 description 2
- 229920003169 water-soluble polymer Polymers 0.000 description 2
- 229910018072 Al 2 O 3 Inorganic materials 0.000 description 1
- 229910018626 Al(OH) Inorganic materials 0.000 description 1
- 206010007269 Carcinogenicity Diseases 0.000 description 1
- 240000007594 Oryza sativa Species 0.000 description 1
- 235000007164 Oryza sativa Nutrition 0.000 description 1
- 239000002202 Polyethylene glycol Substances 0.000 description 1
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 1
- BOTDANWDWHJENH-UHFFFAOYSA-N Tetraethyl orthosilicate Chemical compound CCO[Si](OCC)(OCC)OCC BOTDANWDWHJENH-UHFFFAOYSA-N 0.000 description 1
- 230000033228 biological regulation Effects 0.000 description 1
- 230000000711 cancerogenic effect Effects 0.000 description 1
- 231100000315 carcinogenic Toxicity 0.000 description 1
- 231100000260 carcinogenicity Toxicity 0.000 description 1
- 230000007670 carcinogenicity Effects 0.000 description 1
- 230000003197 catalytic effect Effects 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 239000012141 concentrate Substances 0.000 description 1
- 238000002425 crystallisation Methods 0.000 description 1
- 230000008025 crystallization Effects 0.000 description 1
- 230000001186 cumulative effect Effects 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 239000008367 deionised water Substances 0.000 description 1
- 229910021641 deionized water Inorganic materials 0.000 description 1
- 238000003795 desorption Methods 0.000 description 1
- 229910003460 diamond Inorganic materials 0.000 description 1
- 239000010432 diamond Substances 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 238000007865 diluting Methods 0.000 description 1
- KPUWHANPEXNPJT-UHFFFAOYSA-N disiloxane Chemical class [SiH3]O[SiH3] KPUWHANPEXNPJT-UHFFFAOYSA-N 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 238000011049 filling Methods 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 238000009472 formulation Methods 0.000 description 1
- 229910052809 inorganic oxide Inorganic materials 0.000 description 1
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- 238000002156 mixing Methods 0.000 description 1
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- 229910052710 silicon Inorganic materials 0.000 description 1
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- 239000002002 slurry Substances 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
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Description
アルミナ源、シリカ源、紡糸助剤及び水を含有する紡糸液を調製する紡糸液調製工程、該紡糸液を細孔より大気中に押出し、乾燥することによりアルミナ繊維前駆体の集合体を得る紡糸工程、該アルミナ繊維前駆体の集合体をニードリング処理するニードリング工程、及びニードリング処理された該アルミナ繊維前駆体の集合体を焼成する焼成工程を有し、該シリカ源は、動的光散乱法によって測定される、平均粒子径分布のモード径が20nm以上60nm以下かつ該粒子径分布の標準偏差が20nm以上35nm以下のシリカゾルであり、該紡糸助剤は、重合度の加重平均が2.0×103以上3.0×103以下であり、ケン化度の加重平均が85.0以上95.0以下のポリビニルアルコールであり、該紡糸液のB型粘度計による25℃での粘度が5.0×103mPa・s以上1.5×104mPa・s以下であるアルミナ繊維集合体の製造方法。
該ポリビニルアルコールAとポリビニルアルコールBとの質量比率が9~5:1~5であり、該ポリビニルアルコールA及びポリビニルアルコールBにおける重合度の加重平均が2.0×103以上3.0×103以下であり、該ポリビニルアルコールA及びポリビニルアルコールBにおけるケン化度の加重平均が85.0以上95.0以下である、[10]に記載のアルミナ繊維集合体の製造方法。
繊維径(μm)=(測定値)/(観察倍率)×1000
平均繊維径(μm)=300点の繊維径の合計値/300
ECB/TM/1(00)rev2のDRAFT-4の記載に沿って、次式(a)~(d)より算出された「長さ加重幾何平均径-2×標準誤差」は6.0μm以上10.0μm以下、特に6.0μm以上8.0μm以下であることが好ましい。
(1) アルミナ源、シリカ源、紡糸助剤及び水を含有する紡糸液を得る紡糸液調製工程
(2) 該紡糸液を細孔より大気中に押出し、乾燥することでアルミナ繊維前駆体の集合体を得る紡糸工程
(3) 該アルミナ繊維前駆体の集合体にニードリング処理を行うニードリング工程
(4) 該ニードリング処理されたアルミナ繊維前駆体を焼成する焼成工程
紡糸液調製工程では、例えばアルミナ源とシリカ源を、最終的なアルミナ質繊維が所望する化学組成となるようにアルミナ成分とシリカ成分の比に混ぜ、さらに紡糸助剤を配合して均一に混合してから減圧濃縮するのが好ましい。
紡糸工程は好ましくは、高速の紡糸気流中に紡糸液を供給するブローイング法によって行われ、これにより長さが数十mm~数百mmのアルミナ短繊維前駆体の集合体が得られる。上記の紡糸の際に使用する紡糸ノズルの構造は、特に制限はないが、例えば、特許第2602460号公報に記載されているような、エアーノズルより吹き出される空気流と紡糸液供給ノズルより押し出される紡糸液流とは並行流となり、しかも、空気の並行流は充分に整流されて紡糸液と接触する構造のものが好ましい。この場合、紡糸ノズルの直径は通常0.1~0.5mmであり、紡糸液供給ノズル1本あたりの液量は、通常0.1~120ml/h、好ましくは0.3~50ml/hであり、エアーノズルからのスリットあたりのガス流速は通常40~200m/sである。また、紡糸液供給ノズル1本あたりの液量のばらつきは通常±5%以内、好ましくは±2%以内であり、エアノズルからのスリットあたりのガス流速のばらつきは通常±15%以内、好ましくは±8%以内である。かかる液、ガス流速をより精密に制御できることは、繊維径分布をよりシャープにするための極めて重要な要因となっているものと考えられる。
ニードリング工程では、アルミナ短繊維前駆体の集合体(積層シート)にニードリングを施すことにより、厚さ方向にも配向された機械的強度の大きいアルミナ繊維集合体(アルミナ繊維ニードルブランケットという場合がある)とする。
焼成工程では、上記ニードリング処理されたアルミナ短繊維前駆体の集合体を空気雰囲気中で焼成する。焼成温度は、通常500℃以上、好ましくは700℃以上1400℃以下の温度で行う。焼成温度が500℃未満の場合は結晶化が不十分なため強度の小さい脆弱なアルミナ繊維しか得られず、焼成温度が1400℃を越える場合は繊維の結晶の粒成長が進行して強度の小さい脆弱なアルミナ繊維しか得られない。好ましくは、焼成工程の最高焼成温度が1000℃以上1300℃以下であり、最高焼成温度までの昇温速度が40℃/分以下であり、より好ましくは30℃/分以下、さらに好ましくは20℃/分以下であり、一方、1℃/分以上が好ましく、より好ましくは3℃/分以上、さらに好ましくは5℃/分以上であり、上記焼成工程を上記条件とすることで、緻密な繊維構造を維持しつつ、高生産性を確保できる点で好ましい。
測定サンプルとしてアルミナ繊維集合体0.2~0.5gに荷重10kN/m2を2回繰り返し与えることで測定サンプルを粉砕した。粉砕サンプルを走査型電子顕微鏡(SEM)を用いて、倍率1000~3000の範囲で適宜選択しながら撮影した。該SEM写真から、ノギス又は直定規で0.1mm単位で量り取る。そして、任意に合計300本の繊維径を測定し、次式により平均繊維径を算出した。この際、計算値は小数点以下2ケタを四捨五入して小数点以下1桁とした。また、合計300本に対して、繊維径が10.0μmを超える繊維の割合(%)を本数基準で算出した(但し該繊維は、融着した繊維を含まないものとする。)。
繊維径(μm)=(測定値)/(観察倍率)×1000
平均繊維径(μm)=300点の繊維径の合計値/300
(長さ加重幾何平均径-2×標準誤差)
長さ加重幾何平均径は前記(1)式で定義される。
測定サンプル(SiO2濃度20.5%溶液、10ml)を濃度0.002Nの塩酸で40倍に希釈して25℃にした後の希釈溶液5ml(最終濃度 0.5%)を、動的光散乱装置(大塚電子社製ELS-Z)により、以下の測定条件で、シリカゾル粒子径分布を測定した。得られたシリカゾル粒子径分布からモード径及び標準偏差を算出した。
[測定条件]
Correlation Method : T.D
Correlation Channel: 440
Angle(°) : 165.0
Incident Filter(%) : 10.12%
積算回数 : 70
サンプルであるアルミナ繊維一本を、1mm角のダイヤモンド基板上に載せ、島津製作所製微小圧縮試験機 MCTM-500にて、直径50μmの平面圧子を用いて、該アルミナ繊維一本あたりの破壊荷重を測定した。次式に従って破壊荷重より単繊維引張強度を求め、10点の単繊維引張強度の平均値を算出して、平均単繊維引張強度とした。
測定サンプル1gを乳鉢にて粉砕し、150℃、真空下で3時間減圧加熱処理を行った後、カンタークローム社製・オートソーブ3Bにて、液体窒素温度下で吸着等温線(吸着ガス:窒素)を測定した。得られた吸着側等温線を用いて、BET多点法解析を実施し比表面積を、また得られた吸着側及び脱離側吸着等温線を用いて、BJH法解析により全細孔分布を求めた。
温度条件を25℃にし、アルミナ繊維集合体をGBD(嵩密度)=0.33g/cm3から0.38g/cm3まで圧縮することを20回繰り返した。その際、第1回目のGBD=0.33g/cm3での面圧値と第20回目のGBD=0.33g/cm3での面圧値を測定し、以下の式より面圧の劣化度合いの指標となる面圧残存率(%)を求めた。結果を表1に示す。
高温サイクル面圧の測定方法は、アルミナ繊維集合体をGBD(嵩密度)=0.38g/cm3で30分間圧縮した後、上下のプレートを昇温速度15℃/分で600℃まで昇温し、GBD=0.33g/cm3(開放側)から0.38g/cm3(圧縮側)まで圧縮することを800回繰り返した。その際、第1回目のGBD=0.33g/cm3(開放側)又は0.38g/cm3(圧縮側)での面圧値と第800回目のGBD=0.33g/cm3(開放側)又は0.38g/cm3(圧縮側)での面圧値を測定し、以下の式より、面圧の劣化度合いの指標となる高温サイクル面圧残存率(%)を求めた。
[高温サイクル開放側面圧残存率(%)]=[第800回目の面圧値(GBD=0.33g/cm3)]/[第1回目の面圧値(GBD=0.33g/cm3)]×100
[高温サイクル圧縮側面圧残存率(%)]=[第800回目の面圧値(GBD=0.38g/cm3)]/[第1回目の面圧値(GBD=0.38g/cm3)]×100
アルミナ繊維集合体を50mm角に打ち抜き、質量が5.0±0.03gになるように複数枚重ねて調整する。幅50mm角、厚み4mmの金型に入れ、プレス機で10kNの荷重を10分間かける。圧縮後、上記サンプルを5~10mm角程度に裂き、こぼれないように1Lのビーカーに水温23度のイオン交換水400mlと共に入れた。撹拌速度1000rpmにて10分間撹拌・解繊したのち、1Lメスシリンダーへ移した。その際、内壁や撹拌羽についた付着繊維をイオン交換水で洗い落しながら回収し、イオン交換水の総量を500mlとした。
測定サンプルを乳鉢にて粉砕し、X線回折装置(例えばRIGAKU社製)で感電圧30kv、感電流40mA、4°/分の速度で測定し、ムライトのピーク2θ=26.3°の高さhを読み取った。また、同じ条件でムライト標準物質(例えばNIST Alpha Quartz)を測定し、2θ=26.3°のピーク高h0を読み取る。このときのムライト化率は以下の式で表す値となる。
[紡糸液の調整工程]
先ず、アルミニウム濃度が163g/Lの塩基性塩化アルミニウムの水溶液1.0L当たり、モード径43nm(標準偏差24nm)、濃度20.5質量%のシリカゾル溶液0.496L、10質量%ポリビニルアルコール(重合度2400、ケン化度88.0)水溶液0.257Lを添加して混合した後、減圧濃縮し、紡糸液を得た。紡糸液の粘度は7.1×103mPa・s(25℃におけるB型粘度計(東機産業製(形式TVB-10M粘度計、ロータTM3(半径12.7mm、厚み1.67mm)回転速度12rpm))による測定、以下の実施例について同様)による測定値)であった。
上記の紡糸液をブローイング法で紡糸し、アルミナ繊維前駆体を得た。なお、紡糸ノズルとしては、特許第2602460号公報図6に記載されたものと同様の構造の紡糸ノズルを使用し、製造条件等は特許第2602460号に準じて実施した。
上記のアルミナ繊維前駆体を、1200℃までの昇温速度を5℃/分、1200℃で30分間空気中で焼成し、アルミナ繊維集積体を得た。得られたアルミナ繊維集積体の評価を表1に示す。
参考例1において、10質量%ポリビニルアルコール(重合度2400、ケン化度88.0)水溶液の代わりに、ポリビニルアルコールA(重合度2100、ケン化度88.0)及びポリビニルアルコールB(重合度2600、ケン化度97.6)を比率8:2で混合し、ポリビニルアルコールとして10質量%の水溶液(重合度の加重平均2200、ケン化度の加重平均89.9)を同量添加して混合した後、減圧濃縮し得られた紡糸液の粘度が8.2×103mPa・sであること以外は、参考例1と同様にしてアルミナ繊維集積体を得た。得られたアルミナ繊維集積体の評価を表1に示す。
参考例1において、モード径43nm(標準偏差24nm)、濃度20.5質量%のシリカゾル溶液0.490Lの代わりに、シリカゾルのモード径22nm(標準偏差8nm)、濃度10.5%のシリカゾル0.957Lを添加し、減圧濃縮し得られた紡糸液の粘度が6.7×103mPa・sであり、ゲル状であったこと以外は、参考例1と同様にアルミナ繊維集積体を得た。得られたアルミナ繊維集積体の評価を表1に示す。
参考例1において、10質量%ポリビニルアルコール(重合度2400、ケン化度88.0)の代わりに、10質量%ポリビニルアルコール(重合度1700、ケン化度88.0)を同量添加して混合した後、減圧濃縮し得られた紡糸液の粘度が2.7×103mPa・sであった以外は、参考例1と同様にアルミナ繊維集積体を得た。得られたアルミナ繊維集積体の評価を表1に示す。
[紡糸液の調製工程]
参考例1と同様に、アルミニウム濃度が163g/Lの塩基性塩化アルミニウムの水溶液1.0L当たり20.5質量%シリカゾル溶液0.490L、10.5質量%ポリビニルアルコール(重合度2100、ケン化度88.0)水溶液0.243Lを添加して混合した後、減圧濃縮し、紡糸液を得た。紡糸液の濃度は8.0×103mPa・sであった。
次に、上記の紡糸液をブローイング法で紡糸した。紡糸ノズルとしては、特許第2602460号公報図6に記載されたものと同様の構造の紡糸ノズルを使用した。また、繊維捕集に際しては、高速気流に並行流で乾燥した165℃の温風(温度30℃、相対湿度40%の大気を加温)をスクリーンに導入することにより、繊維捕集器付近の空気流を温度45℃、相対湿度30%以下に調整した。そして、紡糸気流に対して略直角となる様に金網製の無端ベルトを設置し、無端ベルトを回転させつつ、これにアルミナ短繊維前駆体を含む紡糸気流を含む紡糸気流を衝突させる構造の集積装置により連続シート(薄層シート)として回収した。
集積装置より回収された薄層シートは、連続的に引出して折畳み装置に送り、所定の幅に折り畳んで積み重ねつつ、折り畳み方向に対して直角方向に連続的に移動させることにより積層シートにした。上記の折畳み装置としては、特開2000―80547号公報に記載されたものと同様の構造の折畳み装置を使用した。
上記の積層シート(アルミナ短繊維前駆体の集合体)にニードリングを施した後、800℃までの昇温速度を16℃/分、1200℃で30分間空気中で焼成し、アルミナ繊維集合体を得た。上記のニードリングはニードルパンチング機械により、焼成後のアルミナ繊維集合体におけるニードル痕密度が5~30回/cm2となるようにパンチングを行い、ニードリング処理されたアルミナ繊維集合体(アルミナ繊維ニードルブランケット)を得た。得られたアルミナ繊維ニードルブランケットの評価を表2に示す。
実施例1において、10.5質量%ポリビニルアルコール(重合度2100、ケン化度88.0)水溶液0.243Lの代わりに、参考例2に記載のポリビニルアルコールA及びポリビニルアルコールBを含む水溶液を調整し、該水溶液0.258Lを添加し、減圧濃縮後の紡糸液の粘度が6.5×103mPa・sであったこと以外は、実施例1と同様にアルミナ繊維ニードルブランケットを得た。得られたアルミナ繊維ニードルブランケットの評価を表2に示す。
比較例1において、特開2005-120560に記載の条件に基づき、実施例1と同様にアルミナ繊維ニードルブランケットを得た。得られたアルミナ繊維ニードルブランケットの評価を表2に示す。なお、シリカゾルは参考例3に記載のものを使用した。
本出願は、2016年7月11日付で出願された日本特許出願2016-136958に基づいており、その全体が引用により援用される。
Claims (8)
- アルミナ短繊維からなるニードリング処理されたアルミナ繊維集合体であって、
該アルミナ短繊維の平均繊維径が6.0μm以上10.0μm以下であり、該アルミナ短繊維の比表面積が0.2m2/g以上1.0m2/g以下であり、
かつ、該アルミナ繊維集合体の高温サイクル開放側面圧残存率(%)が45%以上であり、
該アルミナ繊維集合体の水中嵩密度が1.40×10-2g/ml以上2.00×10-2g/ml以下であり、
前記アルミナ短繊維の繊維径が10.0μmを超える繊維の割合が本数基準で2.7%以下であることを特徴とするニードリング処理されたアルミナ繊維集合体。 - 前記アルミナ短繊維の繊維径の長さ加重幾何平均径からその標準誤差の2倍値を引いた値が6.0μm以上である、請求項1に記載のアルミナ繊維集合体。
- 前記アルミナ短繊維の全細孔容積が2.5×10-3ml/g以下である、請求項1又は2に記載のアルミナ繊維集合体。
- 前記アルミナ短繊維の平均単繊維引張強度が1.20×103MPa以上である、請求項1~3のいずれか1項に記載のアルミナ繊維集合体。
- 前記アルミナ短繊維の化学組成がアルミナ70質量%以上75質量%以下、かつシリカ25質量%以上30質量%以下である、請求項1~4のいずれか1項に記載のアルミナ繊維集合体。
- 前記アルミナ繊維集合体のムライト化率が5.0%以下である請求項1~5のいずれか1項に記載のアルミナ繊維集合体。
- 前記ニードリング処理により生じたニードル痕を有する請求項1~6のいずれか1項に記載のアルミナ繊維集合体。
- 自動車用排ガス洗浄装置のクッション材用である、請求項1~7のいずれか1項に記載のアルミナ繊維集合体。
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