JP2017031396A - Cmc材料における繊維間隔の改善された均一性 - Google Patents
Cmc材料における繊維間隔の改善された均一性 Download PDFInfo
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- JP2017031396A JP2017031396A JP2016139866A JP2016139866A JP2017031396A JP 2017031396 A JP2017031396 A JP 2017031396A JP 2016139866 A JP2016139866 A JP 2016139866A JP 2016139866 A JP2016139866 A JP 2016139866A JP 2017031396 A JP2017031396 A JP 2017031396A
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Abstract
【解決手段】マトリックス材(22)と、マトリックス材(22)に包まれた一方向配列のトウを形成する複数の繊維(16)と、テープ(20)内で隣接する繊維(16)間に分散した複数の充填材粒子(24)とを含む予備含浸復号テープ(20)が提供される。繊維(16)は、平均繊維径約5〜約40μmを有し、テープ(20)内に約15〜約40体積%含まれる。複数の充填材粒子(24)は、テープ(20)が、対数正規体積メジアン径対平均繊維径比約0.05:1〜約1:1を有するような対数正規体積メジアン径を有する。さらに、セラミックマトリックス複合材料の製造方法を提供する。
【選択図】図6B
Description
(発明の背景)
効率向上のために、ガスタービンの稼働温度の高温化が絶えず求められている。鉄基、ニッケル基及びコバルト基超合金の調製により、高温性能の著しい進歩は達成されているが、代替材料が検討されている。CMC材料は、その高温性能が冷却空気の必要量を顕著に低減できるため、注目に値する例である。CMC材料は、一般に、セラミックマトリックス材に埋め込まれたセラミック繊維強化材を備える。強化材は、マトリックス材に分散された不連続短繊維、或いはマトリックス材内で配向された連続繊維又は繊維束であってよく、マトリックスの亀裂発生時にはCMCの荷重支持構成要素として機能する。一方、セラミックマトリックスは強化材を保護し、その繊維の配向を維持し、強化材に対する荷重を消散するように機能する。マトリックス材及び/又は強化材が炭化ケイ素(SiC)などであるシリコン系複合材は、高温用途、例えば、航空機のガスタービンエンジン及び発電産業で使用される地上設置型ガスタービンエンジンを含むガスタービンの高温部品に特に重要である。
以下、本発明を詳細に説明する。
注目に値する、しかし非限定的なCFCC材料の例は、HiPerComp(登録商標)の名称でGeneral Electric社によって開発されており、炭化ケイ素及び元素状ケイ素又はケイ素合金のマトリックスに炭化ケイ素連続繊維を含む。
しかし、他の材料、例えば、充填材粒子が炭素粒子、Mo5Si3粒子、又はポリマー粒子を含む場合は、焼成工程中に変換できる。ポリマー粒子を利用する実施形態ではは、溶剤系に可溶性でなく、バーンアウト工程までその存在を保持するポリマー粒子が選択される。
(実施例)
溶媒、バインダー、樹脂、可塑剤、炭素粉末、及びSiC粉末を使用してスラリーを作製した。種々の反復テストには、元のSiC粉末とメジアン径の異なる別のSiC粉末との質量で1:1の置換を唯一の変更点とした。スラリー又は加工条件に他の変更は行っていない。メジアン径0.6μmを有するSiC粒子で形成されたCMC層を図4に示し、メジアン径7μmを有するSiC粒子で形成されたCMC層を図5に示す。
Claims (9)
- マトリックス材(22)と、
マトリックス材(22)に包まれた一方向配列のトウ(2)を形成する複数の繊維(16)であって、平均繊維径約5〜約40μmを有し、テープ(20)内に約15〜約40体積%含まれる、複数の繊維(16)と、
テープ(20)において隣接する繊維(16)間に分散し、かつメジアン径を有する、複数の充填材粒子(24)であって、 テープ(20)はメジアン径対平均繊維径比約0.05:1〜約1:1を有する、複数の充填材粒子(24)と、を備える複数の予備含浸複合テープ(20)。 - 充填材粉末のメジアン径対平均繊維径比は約0.07:1〜約0.7:1である、請求項1に記載のテープ(20)。
- 充填材粉末のメジアン径対繊維径比は約0.1:1〜約0.5:1である、請求項1に記載のテープ(20)。
- 充填材粒子(24)は、SiC粒子、炭素粒子、ホウ素粒子、B4C粒子、Si3N4粒子、Mo5Si3粒子、MoSi2粒子、ケイ化物粒子、酸化物粒子、ポリマー粒子、又はそれらの混合物を含む、請求項1に記載のテープ(20)。
- マトリックス材(22)は、セラミック成形粉末からなる、請求項1に記載のテープ(20)。
- セラミック成形粉末は、複数の炭素粒子を含む、請求項5に記載のテープ(20)。
- 充填材粒子(24)は、テープ(20)内に体積分率で約5〜約40%含まれる、請求項1に記載のテープ(20)。
- 各繊維(16)が平均繊維径5〜40μmを有する、繊維(16)集合体を提供するステップと、
バインダーと、溶媒と、充填材粉末とを含むスラリー組成物で繊維(16)集合体を含浸するステップと、
含浸した繊維(16)集合体を一方向性テープ(20)に形成するステップであって、充填材粒子(24)がテープ(20)において隣接する繊維(16)間に分散するように、充填材粉末が繊維(16)集合体に入り込み、充填材粒子(24)がメジアン径対平均繊維径比約0.05:1〜約1:1を有するメジアン径を有する、ステップと、
テープ(20)を成形プリフォームに加工するステップと、
約400°C以上に加熱することによってプリフォームを熱分解して、バインダーの有機成分を分解し、かつ任意のプレセラミックポリマー又は炭素形成ポリマー成分をそれぞれセラミック又は炭素へと変換するステップと、
化学気相含侵、液相含浸、又は溶融含浸を使用して複合材プリフォームを緻密化するステップとを備える、セラミックマトリックス複合材の製造方法。 - 充填材粒子(24)は、SiC粒子、炭素粒子、ホウ素粒子、B4C粒子、Si3N4粒子、Mo5Si3粒子、MoSi2粒子、ケイ化物粒子、酸化物粒子、ポリマー粒子、又はそれらの混合物を含み、
充填材粒子(24)のメジアン径は平均繊維径の0.07〜0.7倍であり、テープ内の所望の粒度範囲内の充填材粒子(24)の体積分率は5〜40%であり、スラリー組成物は複数の炭素粒子をさらに含み、充填材粒子(24)はテープ内に体積分率で約5〜約40%含まれる、請求項8に記載の方法。
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| US14/813,239 | 2015-07-30 | ||
| US14/813,239 US20170029340A1 (en) | 2015-07-30 | 2015-07-30 | Uniformity of fiber spacing in cmc materials |
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| JP2021195268A (ja) * | 2020-06-10 | 2021-12-27 | イビデン株式会社 | SiC/SiC複合材の製造方法 |
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| JP6685929B2 (ja) * | 2014-12-12 | 2020-04-22 | 国立大学法人京都大学 | 炭化ケイ素繊維強化炭化ケイ素複合材料 |
| US10723660B2 (en) * | 2017-01-11 | 2020-07-28 | General Electric Company | Carbon yielding resin for melt infiltration |
| US10822281B2 (en) | 2018-11-09 | 2020-11-03 | Raytheon Technologies Corporation | Accelerated CVI densification of CMC through infiltration |
| DE102019213351A1 (de) * | 2019-09-03 | 2021-03-04 | Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. | Verfahren zur Herstellung faserverstärkter Verbundwerkstoffe mit stabilisierten Fasern, Faserbeschichtungen und/oder Faserbündelbeschichtungen |
| US12099894B2 (en) * | 2019-09-20 | 2024-09-24 | Rtx Corporation | Composite material marking and identification |
| EP4204481A1 (en) * | 2020-08-28 | 2023-07-05 | Toray Advanced Composites | Ud tape with improved processing characteristics and method for production thereof |
| US20230192558A1 (en) * | 2021-12-20 | 2023-06-22 | Raytheon Technologies Corporation | Pva based binder application for cmcs |
| US12534808B2 (en) | 2022-11-09 | 2026-01-27 | General Electric Company | Methods and apparatus for coating fibers |
| US20250066260A1 (en) * | 2023-08-21 | 2025-02-27 | Rtx Corporation | Polymer towpreg for ceramic matrix composites |
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