JP6462115B2 - 多孔質媒体中でナノファイバーを一方向に配列する装置及び方法 - Google Patents
多孔質媒体中でナノファイバーを一方向に配列する装置及び方法 Download PDFInfo
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- B29C70/24—Fibrous reinforcements only characterised by the structure of fibrous reinforcements, e.g. hollow fibres using fibres of substantial or continuous length oriented in at least three directions forming a three-dimensional [3D] structure
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- B29C70/40—Shaping or impregnating by compression not applied
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- B29C70/28—Shaping operations therefor
- B29C70/40—Shaping or impregnating by compression not applied
- B29C70/50—Shaping or impregnating by compression not applied for producing articles of indefinite length, e.g. prepregs, sheet moulding compounds [SMC] or cross moulding compounds [XMC]
- B29C70/504—Shaping or impregnating by compression not applied for producing articles of indefinite length, e.g. prepregs, sheet moulding compounds [SMC] or cross moulding compounds [XMC] using rollers or pressure bands
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- B29K2105/06—Condition, form or state of moulded material or of the material to be shaped containing reinforcements, fillers or inserts
- B29K2105/12—Condition, form or state of moulded material or of the material to be shaped containing reinforcements, fillers or inserts of short lengths, e.g. chopped filaments, staple fibres or bristles
- B29K2105/122—Condition, form or state of moulded material or of the material to be shaped containing reinforcements, fillers or inserts of short lengths, e.g. chopped filaments, staple fibres or bristles microfibres or nanofibers
- B29K2105/124—Nanofibers
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- B29K2105/00—Condition, form or state of moulded material or of the material to be shaped
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- B82Y—SPECIFIC USES OR APPLICATIONS OF NANOSTRUCTURES; MEASUREMENT OR ANALYSIS OF NANOSTRUCTURES; MANUFACTURE OR TREATMENT OF NANOSTRUCTURES
- B82Y30/00—Nanotechnology for materials or surface science, e.g. nanocomposites
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Description
本出願は、引用することにより本明細書の一部をなす、「Apparatus and Method for Directional Alignment of Nanofibers in a Porous Medium」と題する、2014年5月28日に出願された米国仮特許出願第62/003,982号に対する優先権を主張する。
繊維強化複合材料は、一般的な種類の複合材料である。繊維強化複合材料は、通常、2つの構成要素、すなわち繊維強化システム及びマトリックスを備える。繊維強化システムは、複合材料を強化するように所望のパターンで配置される繊維群である。マトリックスは、繊維を合わせて結合し、繊維間で荷重を伝達するために使用される。一般的なマトリックスは、熱硬化性樹脂(エポキシ樹脂等)、熱可塑性樹脂(PEEK等)、セラミック及び金属である。一般的な繊維強化材は、炭素繊維、ガラス繊維、金属繊維、アラミド繊維及び天然繊維である。繊維のうちの大部分が、3マイクロメートルより大きい直径を有する(すなわち、マイクロファイバー)。ナノテクノロジーにおける最近の開発により、1ナノメートルから1マイクロメートル未満の範囲の直径を有する多くの新たな繊維(すなわち、ナノファイバー)が製造された。ナノファイバーは、炭素系(カーボンナノチューブ、カーボンナノファイバー、カーボンナノワイヤー)、金属系又はセラミック系等とすることができる。
複合材料製造プロセスは、(1)繊維強化システム及びマトリックスを一体化することと、(2)複合積層品を所望の幾何学的形状に形成することとを含む。一般に、繊維システムは、繊維トウ(Fiber Tow:各トウはおよそ2000〜10000のマイクロファイバーを含む)、(多くの繊維トウによって形成された)繊維ファブリック又は繊維プリフォーム(繊維トウが3次元形状に織られている)として供給される。マトリックス(エポキシ樹脂等)は、流体相に変えられ、その後、繊維システムの開放空間内に徐々に流れ込み、繊維システムを飽和させることができる。このマトリックス飽和プロセス中、固体繊維システムは「多孔質媒体」として処理され、それは、流体マトリックス及び空気がそこを通って流れ、多孔質媒体内部の孔空間を充填するのを可能にする。マトリックスが繊維システムを完全に飽和させた後、マトリックスを固体に転化させ、金型内で複合材料を任意の所望の形状に形成することができる。
上述したような複合材料は、以下の微小機械的理由のうちの任意のものによって破損する可能性がある。すなわち、(1)繊維破壊、(2)マトリックス破壊、(3)繊維/マトリックス界面破損、及び(4)繊維微小座屈(micro-buckling)である。複合積層品に対して、繊維配列方向、すなわち積層品の面内方向に沿って引張力が加えられる場合、複合積層品は、通常、応力が繊維破壊限界に達するまで破損しない。これは、複合積層品の理想的な理論的強度である。しかしながら、現実には、応力は、繊維方向に完全に整合しない可能性がある。例えば、応力が積層品の面外方向に作用している場合、マトリックス破壊及び繊維/マトリックス界面破損によって明らかなように、破損が発生する。こうした破損シナリオは、一般に、複合積層品の複数枚の層の間で観察される。破損が二枚の層の間にある場合、それは層間破損とも呼ばれる。
Claims (22)
- 多孔質媒体中でナノファイバーを一方向に配列する方法であって、
外部流デバイスにおける流体マトリックス内にナノファイバー分散を確立することと、
前記多孔質媒体を前記流体マトリックスと接触させることと、
成形器具に対して前記多孔質媒体を位置決めすることであって、それにより、該多孔質媒体が該成形器具の表面に少なくとも部分的に形状が適合することと、
前記成形器具内の圧力を制御することであって、それにより、前記流体マトリックスが前記多孔質媒体及び前記成形器具を通って流れ、前記多孔質媒体内の前記ナノファイバーが配列されるようにすることと、
を含む、方法。 - 前記表面は湾曲しており、前記制御することは、前記流体マトリックスが前記表面の湾曲に対して半径方向に流れるように行われる、請求項1に記載の方法。
- 前記制御することは、前記成形器具内の圧力と前記外部流デバイス内の圧力との圧力差をもたらすことを含む、請求項2に記載の方法。
- 前記成形器具内の前記圧力は、前記外部流デバイス内の圧力より高く、それにより、前記成形器具からの前記流体マトリックスの発散半径方向流がもたらされる、請求項3に記載の方法。
- 前記成形器具内の前記圧力は、前記外部流デバイス内の圧力より低く、それにより、前記成形器具に向かう前記流体マトリックスの収束半径方向流がもたらされる、請求項3に記載の方法。
- 前記流体マトリックスの前記流れが収束流と発散流との間で交互になるように、前記圧力差を変動させることを更に含む、請求項3に記載の方法。
- 半径方向における前記流体マトリックスの前記流れに対する非半径方向における該流体マトリックスの前記流れの比は、0.3未満である、請求項2に記載の方法。
- 前記流体マトリックスが前記多孔質媒体に入る前に、前記流体マトリックスの半径方向流を生成することを更に含む、請求項2に記載の方法。
- 前記半径方向流の少なくとも70%は、前記成形器具の前記表面に形状が適合する前記多孔質媒体の部分で発生する、請求項8に記載の方法。
- 前記成形器具を回転させることを更に含む、請求項1に記載の方法。
- 前記外部流デバイスから前記多孔質媒体を除去することと、
前記多孔質媒体から過剰な流体マトリックスを除去することと、
前記多孔質媒体の少なくとも一方の側に膜を付与することと、
前記多孔質媒体内の前記流体マトリックスを固化させることと、
を更に含む、請求項1に記載の方法。 - ナノファイバー分散液を含む、外部流デバイス内の流体マトリックスと、
成形器具と、
前記成形器具と接触する多孔質媒体と、
前記成形器具に結合され、かつ前記流体マトリックスが前記多孔質媒体及び前記成形器具を通るように強制的に流されるように、前記成形器具内の圧力を制御するように構成された圧力源であって、前記多孔質媒体を通る前記流体マトリックスの流れは、該多孔質媒体中でナノファイバーを配列する、圧力源と、
を備える、システム。 - 前記成形器具内の前記圧力と前記外部流デバイス内の圧力との圧力差により、前記流体マトリックスが前記多孔質媒体を通って流れる、請求項12に記載のシステム。
- 前記流体マトリックスに圧力を加える圧力源を更に備える、請求項12に記載のシステム。
- 前記成形器具内に前記圧力源によって加えられる前記圧力は、前記外部流デバイス内の圧力より高く、それにより、前記成形器具からの前記流体マトリックスの発散半径方向流がもたらされる、請求項12に記載のシステム。
- 前記成形器具内に前記圧力源によって加えられる前記圧力は、前記外部流デバイス内の圧力より低く、それにより、前記成形器具に向かう前記流体マトリックスの収束半径方向流がもたらされる、請求項12に記載のシステム。
- 前記流体マトリックスに圧力を加える前記圧力源は、前記成形器具内の前記圧力と前記外部流デバイス内の圧力との圧力差をもたらす、請求項14に記載のシステム。
- 前記成形器具は回転する、請求項12に記載のシステム。
- 前記成形器具は弧状ローラーを含む、請求項12に記載のシステム。
- 多孔質媒体中でナノファイバーを一方向に配列し延伸させる方法であって、
前記多孔質媒体を成形器具の外面と外部流デバイスとに接触させることと、
成形器具の内部圧力を、該内部圧力が前記外部流デバイス内の圧力とは異なるように制御することであって、それにより、前記多孔質媒体及び前記成形器具を通るナノファイバーの流体マトリックスの流れをもたらし、前記多孔質媒体を通る流体マトリックスの前記流れにより、前記多孔質媒体内のナノファイバーの配列がもたらされることと、
を含む、方法。 - 前記成形器具の外面の表面は湾曲し、前記成形器具により、前記成形器具の外面の表面の湾曲に対して半径方向に前記流体マトリックスの流れがもたらされる、請求項20に記載の方法。
- 前記成形器具の前記内部圧力を変動させることを更に含む、請求項20に記載の方法。
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| PCT/US2015/033000 WO2015184151A1 (en) | 2014-05-28 | 2015-05-28 | Apparatus and method for directional alignment of nanofibers in a porous medium |
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| JP6672268B2 (ja) * | 2014-09-02 | 2020-03-25 | ユニバーシティ・オブ・サウス・アラバマ | 多孔質ナノ複合材料及びその製造方法 |
| US10052813B2 (en) | 2016-03-28 | 2018-08-21 | Arevo, Inc. | Method for additive manufacturing using filament shaping |
| EP3463821A4 (en) | 2016-06-01 | 2020-01-08 | Arevo, Inc. | LOCALIZED HEATING TO IMPROVE THE INTERLAYER CONNECTION IN 3D PRINTING |
| US10873026B2 (en) * | 2017-03-10 | 2020-12-22 | Wisconsin Alumni Research Foundation | Alignment of carbon nanotubes in confined channels |
| US11911958B2 (en) | 2017-05-04 | 2024-02-27 | Stratasys, Inc. | Method and apparatus for additive manufacturing with preheat |
| WO2018217650A1 (en) | 2017-05-22 | 2018-11-29 | Arevo, Inc. | Methods and systems for three-dimensional printing of composite objects |
| US10864686B2 (en) * | 2017-09-25 | 2020-12-15 | Apple Inc. | Continuous carbon fiber winding for thin structural ribs |
| FR3092592B1 (fr) * | 2019-02-13 | 2021-02-19 | Safran | Procédé de fabrication d’une pièce en matériau composite à matrice renforcée et dispositif de mise en œuvre |
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| CA2394955C (en) * | 1999-12-07 | 2010-01-26 | William Marsh Rice University | Oriented nanofibers embedded in polymer matrix |
| US20020185770A1 (en) | 2001-06-06 | 2002-12-12 | Mckague Elbert Lee | Method for aligning carbon nanotubes for composites |
| ITTO20020256A1 (it) | 2002-03-22 | 2003-09-22 | Fiat Ricerche | Procedimento per la realizzazione di una sorgente luminosa ad incandescenza e sorgente luminosa ottenuta con tale procedimento. |
| US8025960B2 (en) | 2004-02-02 | 2011-09-27 | Nanosys, Inc. | Porous substrates, articles, systems and compositions comprising nanofibers and methods of their use and production |
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| US8337979B2 (en) | 2006-05-19 | 2012-12-25 | Massachusetts Institute Of Technology | Nanostructure-reinforced composite articles and methods |
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