JP2008151117A - 小さくて複雑な特徴部を有するcmc物品 - Google Patents
小さくて複雑な特徴部を有するcmc物品 Download PDFInfo
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- JP2008151117A JP2008151117A JP2007302339A JP2007302339A JP2008151117A JP 2008151117 A JP2008151117 A JP 2008151117A JP 2007302339 A JP2007302339 A JP 2007302339A JP 2007302339 A JP2007302339 A JP 2007302339A JP 2008151117 A JP2008151117 A JP 2008151117A
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- ply
- turbine engine
- gas turbine
- tows
- insert
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- 239000011159 matrix material Substances 0.000 claims description 35
- 239000000463 material Substances 0.000 claims description 28
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Abstract
【解決手段】 ガスタービンエンジン用のCMC部品(10)は、レイアップされたプリプレグプライ(40)と非プライセラミックインサート(650,680)との組合せを使用して形成された、約0.030インチ未満の厚さ及び約0.030インチ未満の小さい半径を有する薄い縁部のような精密な特徴部を有する。本発明のCMC部品は、輪郭変化部又は厚さ変化部に適合した寸法に切断された小さいプライインサートの代わりに配置され、また小さいプライインサートを製造された単一体の不連続強化複合材インサート(650,680)に置き換えることにより、皺のような欠陥を少なくし、寸法制御を改善する。
【選択図】 図6
Description
非プライセラミックインサートは複数の構成を含んでいてもよい。不連続強化複合材料インサートは、プリプレグプライをカットして複数の小片とし、これらの小片をマトリックス材料のスラリーと混合してペースト又はパテを形成することによって製造することができる。様々な長さの繊維又はトウを切断プライの代わりに使用してもよいし、或いは切断プライと共に又は追加して使用してもよい。
レイアップ時に部品の空洞にペースト又はパテを塗工して未硬化インサートを形成し、この未硬化インサートは乾燥時に硬化する。或いは、混合物をモールド成形して硬化させて硬化インサートを形成し、これを部品に組み込んでもよい。不連続強化複合材料から作られたインサートは完全に等方性とはいえないが、硬化CMCレイアップよりは方向性が少ない。かかる機械的特性は完全に等方性とはいえないものの、方向性でもないので、本願では「実質的に等方性」であるという。
例えば、インサート自体が、部品用のレイアップのプライと結合できる部分硬化成形品であってもよく、かかる部分硬化プリフォームは部品の硬化時にプリプレグプライの樹脂マトリックスと結合する。インサートは、CMCマトリックス部と一体の拡散結合を容易にするために炭素に富むものであってもよく、一体結合は溶融ケイ素溶浸時に形成される。或いは、ペーストとして塗工する場合、材料は部品の硬化時にプリプレグプライの樹脂マトリックスと共に硬化できる。最終的に得られるものは、(1)複数の連続トウがマトリックス中で実質的に互いに平行に延在する硬化強化セラミックマトリックス複合材料部分と、(2)部品の輪郭変化及び厚さ変化領域に位置し、実質的に等方性をもつ不連続強化複合材料部分との2以上の異なる部分を有する完全に緻密なタービンエンジン部品である。不連続強化複合材料部分は、マトリックス材料中に不連続繊維を含む材料からなる。不連続強化複合材料部分は強化セラミックマトリックス複合材料部分に隣接していて、強化セラミックマトリックス複合材部品と共に硬化している。
ただし、インサートの使用によって、非常にきつい半径を形成することができ、例えば狭翼弦動翼のように従来技術の薄肉用プライのレイアップでは達成できなかった薄肉部を形成することができる。さらに、不連続強化複合材料インサートの形成又はペーストとしてのインサート材料の使用によって、多数の小さな薄プライを取り扱うことに起因する皺及び付随する欠陥のおそれがなくなる。
SiC/SiC一方向性プリプレグテープを利用してスラリーを調製したが、テープは炭化ケイ素マトリックス中の被覆炭化ケイ素トウであった。トウを構成する繊維は典型的には窒化ホウ素のような剥離皮膜で被覆される。布を液体窒素に曝してプリプレグから裏当てを取り除いた。次いで、布を約1/4平方インチ以下の大きさの複数の片にカットした。Cotronics社(米国ニューヨーク州ブルックリン)から市販の高温セラミックグラファイト接着剤樹脂である「Cotronics Resbond 931」とアセトンとの溶液を等重量のアセトンと混合して調製した。約3gのチョップドプリプレグをプリプレグ/溶液重量比約3対1で溶液に添加して混合物を形成した。一様な粘稠性とするため混合物を適当な手段でブレンドした。これは振盪、撹拌、ボールミリングその他の混合技術で達成できる。所期の用途に合わせて必要であれば、追加量のアセトンを添加するか、或いは溶媒を蒸発させることによって、混合物の粘度を調節することができる。例えば、混合物は、大まかな形に注型成形してから最終的な形に機械加工してもよいし、或いは所定の最終的な形に注型成形して硬化してもよい。或いは、混合物に適当なサブミクロン粉末を添加した後、さらに混合してもよい。このペーストを次いで前述の通り塗工すればよい。
2つの用途は外側コーナーである。図7Aは、動翼プラットフォーム隅肉に使用する場合の本発明の実質的に等方性のセラミックインサート710の使用例を示し、インサートは小さなコーナープライの代わりに全長プライを覆う。図7Bは、鋭い外側コーナーに沿った小さな多数のセラミックプライの代替物としてセラミックインサート730を使用する同様な例を示し、インサートは小さなコーナープライの代わりに全長プライを覆う。図7Cは、補強材としての小さな多数のセラミックプライの代替物として本発明の実質的に等方性のセラミックインサート750を使用する例を示し、この場合、部品断面に沿って大きな輪郭変化があり、インサート750は小さいカットプライの代わりに配置され全長プライで取り囲まれる。
12 翼形部
14 ダブテール
16 前縁部
18 後縁部
24 中央平面
40 プリプレグプライ
41 根元プライ
42 相対的に小さい(プリプレグ)プライ
44 相対的に大きい(プリプレグ)プライ
110 (不連続強化)インサート
510 インサート
520 インサート
530 インサート
540 インサート
550 インサート
560 インサート
570 インサート
610 狭翼弦タービン動翼
612 後縁
614 空気通路
650 不連続強化複合材後縁インサート
652 第1の端部
654 負圧面
656 第2の端部
658 正圧面
680 リブインサート
690 内側巻装プライ
710 セラミックインサート
730 セラミックインサート
750 セラミックインサート
Claims (10)
- ホットセクションガスタービンエンジン部品(10)であって、
互いに実質的に平行に延在する複数の連続トウをマトリックス中に含む硬化強化セラミックマトリックス複合材部分(40,690)と、
当該部品の輪郭又は厚さの変化する領域に位置する、実質的に等方性の特性を有する不連続強化複合材部分(650、680)であって、マトリックス材料中に不連続繊維含有材料を含む不連続強化複合材部分(650、680)と
を含んでなり、不連続強化複合材部分(650、680)が、複数の連続トウを含む強化セラミックマトリックス複合材部分に隣接していおり、不連続強化複合材部分が強化セラミックマトリックス複合材部分と共に硬化している、ホットセクションガスタービンエンジン部品(10)。 - 硬化強化セラミックマトリックス複合材部分(40)が、さらに、マトリックス中に複数の群の連続トウを含んでおり、各群のトウがマトリックス中で互いに実質的に平行に延在しており、各群が、1以上の他の群のトウに対して所定の角度で配向している、請求項1記載のホットセクションガスタービンエンジン部品(10)。
- 第1群のトウが、0°、+45°、−45°、90°、−45°、+45°からなる群から選択される第1の所定の角度で配向しており、0°で配向したトウが部品の軸に平行に配向しており、第1群に隣接した1以上の他の群のトウは、隣接する群の所定の角度とは異なる第2の所定の角度で配向しており、第2の所定の角度が0°、+45°、−45°、90°、−45°、+45°からなる群から選択される、請求項1記載のホットセクションガスタービンエンジン部品(10)。
- 輪郭又は厚さの変化する領域に位置する、実質的に等方性の特性を有する不連続強化複合材部分(680)が、タービン部品のコーナーに配置されている、請求項1記載のホットセクションガスタービンエンジン部品(10)。
- 輪郭又は厚さの変化する領域に位置する、実質的に等方性の特性を有する不連続強化複合材部分(650)が、厚さの変化する部分の補強材として配置される、請求項1記載のホットセクションガスタービンエンジン部品(10)。
- 不連続繊維を含む不連続強化複合材部分(650、680)が、さらに、繊維、トウ及びチョップドプリプレグプライからなる群から選択される繊維含有材料を含む、請求項1記載のホットセクションガスタービンエンジン部品(10)。
- 前記繊維含有材料が約0.1〜1インチの寸法を有する、請求項6記載のホットセクションガスタービンエンジン部品(10)。
- マトリックス材料中に不連続繊維含有材料を含む不連続強化複合材部分が、さらに、マトリックス材料中に繊維含有材料を約10体積%〜約50体積%の充填量で含む、請求項1記載のホットセクションガスタービンエンジン部品(10)。
- 当該タービン部品が狭翼弦タービン動翼(610)であって、実質的に等方性の特性を有する不連続強化複合材部分(650)が動翼の後縁部に配置され、不連続強化複合材部分(650)に硬化強化セラミックマトリックス複合材部分が結合している、請求項1記載のホットセクションガスタービンエンジン部品(10)。
- 当該タービン部品が狭翼弦タービン動翼(610)であって、実質的に等方性の特性を有する不連続強化複合材部分(680)が空気通路(614)の近傍の輪郭変化部にリブとして配置されている、請求項1記載のホットセクションガスタービンエンジン部品(10)。
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Also Published As
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US9005382B2 (en) | 2015-04-14 |
US20080124512A1 (en) | 2008-05-29 |
CA2612038C (en) | 2014-09-02 |
US20090324878A1 (en) | 2009-12-31 |
US7600979B2 (en) | 2009-10-13 |
JP5519905B2 (ja) | 2014-06-11 |
EP1930548A3 (en) | 2012-11-14 |
EP1930548A2 (en) | 2008-06-11 |
CA2612038A1 (en) | 2008-05-28 |
MX2007014550A (es) | 2008-10-28 |
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