JP2004075527A - Carbon fiber reinforced carbon composite material and sliding material using the same - Google Patents
Carbon fiber reinforced carbon composite material and sliding material using the same Download PDFInfo
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Abstract
Description
【０００１】
【産業上の利用分野】
本発明は、強度及び摩擦、摺動特性に優れ、特に高速度・高エネルギー車の摺動材に適した炭素繊維強化炭素複合材に関するものである。
【０００２】
【従来の技術】
一般に炭素繊維強化炭素複合材（以下、「Ｃ／Ｃ複合材」という。）はＰＡＮ系、ピッチ系、或いはレーヨン系などの長短炭素繊維にフェノール樹脂、フラン樹脂などの熱硬化性樹脂、或いはピッチ類などの熱可塑性樹脂等を含浸、又は混合して加熱成形したものを非酸化性雰囲気において焼成し、さらに緻密化、黒鉛化処理することにより製造されている。
【０００３】
Ｃ／Ｃ複合材は摩擦特性、機械特性、耐熱性に優れ、かつ軽量であることから航空機や車両用のブレーキとして用いられている。Ｃ／Ｃ複合材に用いる炭素繊維の強化法としては、２次元織物、所謂織布を用いたり、本発明の如く短繊維を用いる方法があるが、均一な摩擦面が容易に得られること、安価であること等から、一般に短繊維強化型のＣ／Ｃ複合材が摩擦材として用いられてきた。しかしながら、近年の航空機や車両の大型化、高速化に伴って、より高熱容量、高熱伝導率、高強度がＣ／Ｃ複合材に要求されるようになってきた。特に航空機や高速車両用のＣ／Ｃ複合材は、大径（外径〜５００ｍｍφ）かつ高回転（〜８０００ｒｐｍ）、さらに高熱容量、高熱伝導率が要求されている。
【０００４】
例えば、外径５００ｍｍφ、内径１２０ｍｍφ、嵩密度１．８ｋｇ／ｃｍ３で回転数８０００ｒｐｍの条件下に使用する時に必要とされる引張強度は、円周方向の応力（σｔ）ＭＡＸとして次式で求めることができる。
【０００５】
【数１】
ここで、γ：嵩密度（１．８×１０−３ｋｇ／ｃｍ３）
ｒ２ ：外半径（２５ｃｍ）
ｒ１ ：内半径（６ｃｍ）
ω：角速度（８０００／６０）×２π＝８３８ｒａｄ／ｓ
ν：ポアソン比（０．２）
∴ （σｔ）ＭＡＸ＝６５４ｋｇ／ｃｍ２＝６．５ｋｇ／ｍｍ２
（σｔ）ＭＡＸ＝８０６ｋｇ／ｃｍ２＝８．１ｋｇ／ｍｍ２（ｒ１＝ｒ２時のＭＡＸ値）
【０００７】
従って、少なくとも８．５ｋｇ／ｍｍ２以上、好ましくは９ｋｇ／ｍｍ２以上、更に好ましくは１０ｋｇ／ｍｍ２以上の引張強度が必要となる。しかし、従来の短繊維強化型Ｃ／Ｃ複合材では強度不足のため、織布を用いたり摩擦特性を維持するために、中央部は織布を用い、表面のみ短繊維強化型としたＣ／Ｃ複合材等が大型車両用のブレーキ材として提案されている。しかしながら、織布を用いたＣ／Ｃ複合材は高価である上に、摩擦特性に劣り、ブレーキ材としての要求特性を満足したものではなかった。
【０００８】
【発明が解決しようとする課題】
そこで、本発明者らは、短繊維強化型Ｃ／Ｃ複合材に着目して、上記のような問題がなく、高速車両摺動材として有用なＣ／Ｃを提供すべく鋭意検討した。
【０００９】
【課題を解決するための手段】
本発明者等は、かかる課題を解決するため、短繊維を用いたＣ／Ｃ複合材について鋭意検討し、特に、炭素繊維としてピッチ系炭素繊維を使用し、緻密化のためにピッチで含浸することにより、更に緻密化の前に２２００℃以上で黒鉛化し、緻密化焼成温度を２１００℃以下にすることによって、高強度、高熱容量、高熱伝導率、かつ摩擦特性に優れるＣ／Ｃ複合材を製造することができることを見い出し、本発明に到達した。
【００１０】
即ち本発明の要旨は、短繊維強化型Ｃ／Ｃ複合材であって、引張強度８．５ｋｇ／ｍｍ２以上、嵩密度１．８ｇ／ｃｍ３以上、熱伝導率１００Ｗ／ｍ・Ｋ以上、且つ気孔率１０％以下の特性を有するＣ／Ｃ複合材及びそれを用いた摺動材に存する。
以下、本発明を詳細に説明するが、本発明で用いる炭素繊維としてはＰＡＮ系、レーヨン系等の公知のものが使用できるが、高熱容量かつ高熱伝導であるピッチ系炭素繊維を使用するのが好ましい。更に必要に応じてＳｉＣ、Ａｌ２Ｏ３、カーボンブラックなどの無機繊維、無機物などを添加してもよい。
【００１１】
用いられる炭素繊維の形態としては、複数の単繊維からなるトウ、ストランド、ロービング、ヤーンなどの形態であり、これらをカッティングすることにより得られる短繊維を用いるのが好ましい。そして、これらの短繊維は複数の単繊維の束、１０００〜８０００本、好ましくは２０００〜６０００本から形成されており、本発明においては、通常０．３〜１００ｍｍ、好ましくは５〜５０ｍｍ程度の短繊維束を使用する。炭素繊維自体の径や弾性率は、一般に複合材として用いられる範囲で特に限定はない。Ｃ／Ｃ複合材とする際には、該短繊維束を解繊、分散し、二次元ランダムのシートを作製し、マトリックス物質をその間に充填させることが特性向上のために重要である。
【００１２】
このため、本発明においては、上記短繊維束を乾式又は湿式解繊し、二次元ランダムのシートを作製する。ここで乾式解繊し、二次元ランダムに配向したシートの製造方法としては、例えば紡績において一般的な機械的に炭素繊維をモノフィラメント化し、シートを作製するランダムウェバーを使用して製造したり、またはエアーにより解繊し、シートを製造する方法等がある。
【００１３】
また湿式解繊し、二次元ランダムに配向したシートを製造する方法としては、例えばパルプ等の叩解処理に通常使用されているビーターや解繊処理に用いられるパルパーを使用し、溶媒中で短繊維状炭素繊維を解繊後、例えば底部にスクリーンを有する型枠等に少量ずつ供給したり、解繊後攪拌等の手段で均一に分散させ、金網等で抄紙後、乾燥させて作製する方法がある。短繊維状の炭素繊維を均一に分散させる溶媒としては、好ましくは水、或いはアセトン、炭素１〜５のアルコール、アントラセン油等を用いるが、その他の有機溶剤を用いてもよい。又該溶媒中にフェノール樹脂、フラン樹脂或いはピッチ等を分散もしくは溶解させておくと、炭素繊維同士が接着された状態となり、次工程での取り扱いをより容易とするので好ましい。更に、繊維素グリコール酸ナトリウム、ポリビニルアルコール、ヒドロキシセルロース等の増粘剤を溶媒中に加えておくと、その効果が更に増大となるので好ましい。
【００１４】
シートの目付（１ｍ２当りの重量）としては、種々のものが取り得るが、取り扱い性、含浸性、均一性を考えると、１０〜５００ｇ／ｍ２が最適である。この様にして得られた二次元ランダムに配向したシートに、フェノール樹脂、フラン樹脂、或いは石油系、石炭系ピッチ等のマトリックスを含浸させた後乾燥する。その際、マトリックスはアルコール、アセトン、アントラセン油等の溶媒に溶解して適正な粘度に調整したものを使用する。
【００１５】
次いで、この乾燥したシートを積層して金型へ充填し、１００〜５００℃の温度で加圧成形してＶｆ（繊維体積含有量）＝５〜６５％、好ましくは１０〜５５％程度の成形体を得る。その後、Ｎ２ガス等の不活性ガス雰囲気中で１〜２００℃／ｈの昇温速度で２２００℃、好ましくは２４００℃以上２８００℃以下の温度まで焼成し、熱伝導率１００Ｗ／ｍ・Ｋ以上、好ましくは１１０Ｗ／ｍ・Ｋ以上とし、更に引張強度を８．５ｋｇ／ｍｍ２以上、好ましくは９ｋｇ／ｍｍ２以上、更に好ましくは１０ｋｇ／ｍｍ２以上とする。
【００１６】
更に上記焼成したＣ／Ｃ複合材を緻密化する。その方法としては、ＣＶＤ及び／又は樹脂等を用いる方法が挙げられるが、高熱容量且つ高熱伝導性が得られるピッチを含浸することが好ましい。その後更に、２１００℃以下で焼成する緻密化処理を複数回繰り返し気孔率１０％以下とすることにより、嵩密度１．８ｇ／ｃｍ３以上、好ましくは１．９ｇ／ｃｍ３以上となり、高熱容量かつ摩擦特性及び耐酸化性に優れたＣ／Ｃ複合材となる。このとき使用するピッチとしては、種々のピッチを用いることができるが、好ましくは、軟化点７０〜１５０℃、さらに好ましくは８０〜９０℃、トルエン不溶分１０〜３０％、さらに好ましくは１３〜２０％、実質上キノリン不溶分は含まず、固定炭素４０％以上、さらに好ましくは５０％以上のものを用いる。緻密化処理工程以降での最高温度は摩擦特性を向上させるため、２１００℃以下であることが必要であるが、耐酸化性向上のためには１６００℃以上であることが好ましく、かかる緻密化処理工程以降での最高温度は、最終熱処理時の温度であることが必要である。尚、最終熱処理は、緻密化工程であってもよいし、あるいは緻密化工程後に別に設けてもよい。
【００１７】
このようにして得られた短繊維強化型Ｃ／Ｃ複合材は、引張強度８．５ｋｇ／ｍｍ２以上、嵩密度１．８ｇ／ｃｍ３以上、熱伝導率１００Ｗ／ｍ・Ｋ以上、気孔率１０％以下となり、航空機や高速車両用ブレーキとしての要求特性を十分に兼ね備えたものとなる。尚、物性値の測定に当たっては、気孔率については水銀ポロシメーターを使用し、熱伝導率の測定は、レーザーフラッシュ法を用い、引張強度の測定は、ＪＩＳ Ｋ−６９１１に準拠して測定した。
【００１８】
以下、本発明を実施例により具体的に説明するが、本発明はその要旨を越えない限り、下記実施例に限定されるものではない。
【００１９】
【実施例】
以下、実施例により本発明をさらに詳細に説明する。
実施例１
フィラメント数４０００のピッチ系炭素繊維を３０ｍｍ長に切断したものをランダムウェバーにて解繊し、二次元ランダムに配向した目付２００ｇ／ｍ２のシートを得た。このシートへエタノールで希釈したフェノール樹脂を含浸させた後乾燥し、２００ｇ／ｍ２の炭素繊維に対し１３０ｇ／ｍ２のフェノール樹脂を含浸したシートを作製した。このシートを金型内へ積層し、２５０℃にて加圧成形し、Ｖｆ≒５０％の成形体を得た。この成形体を２４００℃迄焼成した後、ピッチを含浸し１０００℃迄焼成した。さらに同様の含浸−焼成の操作を複数回繰り返し、その後最終処理として、２０００℃の熱処理を行って、気孔率８％のＣ／Ｃ複合材を得た。このＣ／Ｃ複合材の特性を表１に示す。
【００２０】
比較例１
実施例１と同様な方法で成形し、２０００℃で焼成した後に、実施例１と同様の緻密化処理を行い、気孔率８％のＣ／Ｃ複合材を得た。このＣ／Ｃ複合材の特性を表１に示す。
比較例２
フィラメント数４０００のピッチ系炭素繊維１００重量部にフェノール樹脂６５重量部含浸し、乾燥したのち３０ｍｍ長に切断した所謂トウプレプリグを作製した。このものを金型内へ充填し、２５０℃にて加圧成形し、Ｖｆ≒５０％の成形体を得た。この成形体を実施例１と同様な方法にて緻密化処理を行い、気孔率８％のＣ／Ｃ複合材を得た。このＣ／Ｃ複合材の特性を表１に示す。
【００２１】
【表１】
【発明の効果】
本発明により、航空機や高速車両用の摩擦特性、機械特性、熱特性、耐酸化性に優れた短繊維強化型Ｃ／Ｃ複合材ブレーキを容易に得ることができる。[0001]
[Industrial applications]
The present invention relates to a carbon fiber reinforced carbon composite material having excellent strength, friction, and sliding characteristics, and particularly suitable for a sliding material of a high-speed, high-energy vehicle.
[0002]
[Prior art]
Generally, carbon fiber reinforced carbon composite material (hereinafter referred to as “C / C composite material”) is a PAN-based, pitch-based or rayon-based long-short carbon fiber and a phenol resin, a thermosetting resin such as a furan resin, or a pitch. It is manufactured by impregnating or mixing a thermoplastic resin or the like, or the like, followed by heat molding, firing in a non-oxidizing atmosphere, and further densifying and graphitizing.
[0003]
C / C composite materials are used as brakes for aircraft and vehicles because of their excellent frictional properties, mechanical properties, heat resistance, and light weight. As a method for reinforcing carbon fibers used in the C / C composite material, there are a method using a two-dimensional woven fabric, a so-called woven fabric, and a method using short fibers as in the present invention. However, a uniform friction surface can be easily obtained. In general, short fiber reinforced C / C composites have been used as friction materials because of their low cost. However, with the recent increase in the size and speed of aircraft and vehicles, higher heat capacity, higher thermal conductivity, and higher strength have been required for C / C composite materials. In particular, C / C composite materials for aircraft and high-speed vehicles are required to have a large diameter (outer diameter of up to 500 mmφ), a high rotation speed (up to 8000 rpm), a high heat capacity, and a high thermal conductivity.
[0004]
For example, the tensile strength required when used under the conditions of an outer diameter of 500 mmφ, an inner diameter of 120 mmφ, a bulk density of 1.8 kg / cm 3 , and a rotation speed of 8000 rpm is defined as a circumferential stress (σ t ) MAX by the following formula. You can ask.
[0005]
(Equation 1)
Here, γ: bulk density (1.8 × 10 −3 kg / cm 3 )
r 2 : outer radius (25 cm)
r 1 : inner radius (6 cm)
ω: angular velocity (8000/60) × 2π = 838 rad / s
ν: Poisson's ratio (0.2)
∴ (σ t ) MAX = 654 kg / cm 2 = 6.5 kg / mm 2
(Σ t ) MAX = 806 kg / cm 2 = 8.1 kg / mm 2 (MAX value when r 1 = r 2 )
[0007]
Therefore, a tensile strength of at least 8.5 kg / mm 2 or more, preferably 9 kg / mm 2 or more, more preferably 10 kg / mm 2 or more is required. However, since the conventional short fiber reinforced C / C composite material is insufficient in strength, in order to use a woven fabric or maintain friction characteristics, a woven fabric is used at the center and only the surface is made of a short fiber reinforced C / C composite. C composite materials and the like have been proposed as brake materials for large vehicles. However, a C / C composite material using a woven fabric is expensive, has poor friction characteristics, and does not satisfy the characteristics required as a brake material.
[0008]
[Problems to be solved by the invention]
Therefore, the present inventors have focused on a short fiber reinforced C / C composite material and have intensively studied to provide a C / C which is free from the above-mentioned problems and is useful as a sliding material for high-speed vehicles.
[0009]
[Means for Solving the Problems]
The present inventors have intensively studied a C / C composite material using short fibers in order to solve such a problem, and in particular, use pitch-based carbon fibers as carbon fibers and impregnate them with pitch for densification. Thereby, the C / C composite material having high strength, high heat capacity, high thermal conductivity, and excellent friction characteristics can be obtained by further graphitizing at 2200 ° C. or higher before densification and setting the densification firing temperature to 2100 ° C. or lower. They found that they could be manufactured and arrived at the present invention.
[0010]
That is, the gist of the present invention is a short fiber reinforced C / C composite material having a tensile strength of 8.5 kg / mm 2 or more, a bulk density of 1.8 g / cm 3 or more, and a thermal conductivity of 100 W / m · K or more. And a C / C composite material having a porosity of 10% or less and a sliding material using the same.
Hereinafter, the present invention will be described in detail. As the carbon fibers used in the present invention, known materials such as PAN-based and rayon-based can be used, but pitch-based carbon fibers having high heat capacity and high heat conductivity are preferably used. preferable. Further, if necessary, inorganic fibers such as SiC, Al 2 O 3 and carbon black, and inorganic substances may be added.
[0011]
The form of the carbon fiber used is a form of a tow, a strand, a roving, a yarn or the like composed of a plurality of single fibers, and it is preferable to use a short fiber obtained by cutting these. And these short fibers are formed from a bundle of a plurality of single fibers, 1000 to 8000, preferably 2000 to 6000, and in the present invention, usually 0.3 to 100 mm, preferably about 5 to 50 mm. Use short fiber bundles. The diameter and elastic modulus of the carbon fiber itself are not particularly limited as long as they are generally used as a composite material. When forming a C / C composite material, it is important to defibrate and disperse the short fiber bundle, produce a two-dimensional random sheet, and fill a matrix material therebetween to improve the properties.
[0012]
Therefore, in the present invention, the short fiber bundle is dry- or wet-defibrated to produce a two-dimensional random sheet. Here, dry defibration, as a method of manufacturing a two-dimensionally randomly oriented sheet, for example, a common mechanically monofilament carbon fiber in spinning, or using a random webber to produce a sheet, or There is a method of defibrating with air to produce a sheet.
[0013]
In addition, as a method of producing a two-dimensionally randomly oriented sheet by wet defibration, for example, a beater usually used for beating pulp or the like or a pulper used for defibration is used, and short fibers are used in a solvent. After fibrillation of the fibrous carbon fiber, for example, it is supplied little by little to a mold having a screen at the bottom or the like, or is uniformly dispersed by means of stirring or the like after fibrillation, paper-made with a wire mesh or the like, and dried to produce. is there. As a solvent for uniformly dispersing the short fibrous carbon fibers, water, acetone, an alcohol having 1 to 5 carbon atoms, anthracene oil, or the like is preferably used, but other organic solvents may be used. Also, it is preferable to disperse or dissolve phenol resin, furan resin, pitch, or the like in the solvent, since the carbon fibers will be in a bonded state and handling in the next step will be easier. Further, it is preferable to add a thickener such as sodium cellulose glycolate, polyvinyl alcohol, or hydroxycellulose to the solvent, since the effect is further increased.
[0014]
As the basis weight (weight per 1 m 2 ) of the sheet, various ones can be used. However, considering the handleability, impregnation property and uniformity, 10 to 500 g / m 2 is optimal. The thus obtained two-dimensionally randomly oriented sheet is impregnated with a phenol resin, a furan resin, or a matrix such as a petroleum-based or coal-based pitch and then dried. At this time, the matrix used is one dissolved in a solvent such as alcohol, acetone, anthracene oil or the like and adjusted to an appropriate viscosity.
[0015]
Next, the dried sheets are laminated, filled in a mold, and pressed at a temperature of 100 to 500 ° C. to form Vf (fiber volume content) = 5 to 65%, preferably about 10 to 55%. Get the body. Then, it is fired in an inert gas atmosphere such as N 2 gas at a temperature rising rate of 1 to 200 ° C./h to 2200 ° C., preferably 2400 ° C. to 2800 ° C., and has a thermal conductivity of 100 W / m · K or more. Preferably, the tensile strength is 110 W / m · K or more, and the tensile strength is 8.5 kg / mm 2 or more, preferably 9 kg / mm 2 or more, more preferably 10 kg / mm 2 or more.
[0016]
Further, the fired C / C composite is densified. Examples of the method include a method using CVD and / or a resin, and it is preferable to impregnate a pitch that provides high heat capacity and high thermal conductivity. After that, the densification treatment of firing at 2100 ° C. or less is repeated a plurality of times to make the porosity 10% or less, so that the bulk density becomes 1.8 g / cm 3 or more, preferably 1.9 g / cm 3 or more, and the high heat capacity and It becomes a C / C composite material having excellent friction characteristics and oxidation resistance. As the pitch used at this time, various pitches can be used, but preferably the softening point is 70 to 150 ° C, more preferably 80 to 90 ° C, the toluene insoluble content is 10 to 30%, and further preferably 13 to 20%. %, Containing substantially no quinoline-insoluble matter and having a fixed carbon of 40% or more, more preferably 50% or more. The maximum temperature after the densification step is required to be 2100 ° C. or lower in order to improve the friction characteristics, but is preferably 1600 ° C. or higher in order to improve the oxidation resistance. The maximum temperature after the process needs to be the temperature at the time of the final heat treatment. The final heat treatment may be performed in the densification step or may be separately provided after the densification step.
[0017]
The short fiber reinforced C / C composite thus obtained has a tensile strength of 8.5 kg / mm 2 or more, a bulk density of 1.8 g / cm 3 or more, a thermal conductivity of 100 W / m · K or more, and a porosity. This is 10% or less, which sufficiently satisfies the characteristics required for brakes for aircraft and high-speed vehicles. In the measurement of the physical properties, the porosity was measured using a mercury porosimeter, the thermal conductivity was measured using a laser flash method, and the tensile strength was measured according to JIS K-6911.
[0018]
Hereinafter, the present invention will be described specifically with reference to examples, but the present invention is not limited to the following examples unless departing from the gist of the present invention.
[0019]
【Example】
Hereinafter, the present invention will be described in more detail with reference to examples.
Example 1
A pitch-based carbon fiber having 4000 filaments cut into a length of 30 mm was defibrated by random webber to obtain a two-dimensionally randomly oriented sheet having a basis weight of 200 g / m 2 . This sheet was impregnated with a phenol resin diluted with ethanol and then dried to prepare a sheet in which 200 g / m 2 of carbon fiber was impregnated with 130 g / m 2 of a phenol resin. The sheet was laminated in a mold and pressed at 250 ° C. to obtain a molded product having a Vf of about 50%. After firing this molded body to 2400 ° C, pitch was impregnated and fired to 1000 ° C. Further, the same operation of impregnation and firing was repeated a plurality of times, and thereafter, as a final treatment, a heat treatment at 2000 ° C. was performed to obtain a C / C composite material having a porosity of 8%. Table 1 shows the characteristics of the C / C composite material.
[0020]
Comparative Example 1
After molding by the same method as in Example 1 and firing at 2000 ° C., the same densification treatment as in Example 1 was performed to obtain a C / C composite material having a porosity of 8%. Table 1 shows the characteristics of the C / C composite material.
Comparative Example 2
A so-called toe prepreg was prepared by impregnating 65 parts by weight of a phenol resin into 100 parts by weight of pitch-based carbon fiber having 4000 filaments, drying and cutting the same to a length of 30 mm. This was filled in a mold and pressed at 250 ° C. to obtain a molded product having a Vf of about 50%. This compact was subjected to a densification treatment in the same manner as in Example 1 to obtain a C / C composite material having a porosity of 8%. Table 1 shows the characteristics of the C / C composite material.
[0021]
[Table 1]
【The invention's effect】
According to the present invention, a short fiber reinforced C / C composite brake excellent in friction characteristics, mechanical characteristics, thermal characteristics, and oxidation resistance for aircraft and high-speed vehicles can be easily obtained.
Claims (5)
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| Application Number | Priority Date | Filing Date | Title |
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| JP2003183424A JP4066896B2 (en) | 2003-06-26 | 2003-06-26 | Carbon fiber reinforced carbon composite material and sliding material using the same |
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| JP2003183424A JP4066896B2 (en) | 2003-06-26 | 2003-06-26 | Carbon fiber reinforced carbon composite material and sliding material using the same |
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| JP27050492A Division JP3484711B2 (en) | 1992-10-08 | 1992-10-08 | Method for producing carbon fiber reinforced carbon composite |
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| JP2004075527A true JP2004075527A (en) | 2004-03-11 |
| JP4066896B2 JP4066896B2 (en) | 2008-03-26 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007217256A (en) * | 2006-02-20 | 2007-08-30 | Ihi Aerospace Co Ltd | Aluminum-impregnated three-dimensional c/c composite and method for producing the same |
| KR101205145B1 (en) | 2010-08-04 | 2012-11-26 | 이비덴 가부시키가이샤 | Carbon fiber reinforced carbon composite and method for manufacturing the same |
| KR101261728B1 (en) | 2010-08-04 | 2013-05-07 | 이비덴 가부시키가이샤 | C/c composite molded body and method for manufacturing the same |
-
2003
- 2003-06-26 JP JP2003183424A patent/JP4066896B2/en not_active Expired - Lifetime
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007217256A (en) * | 2006-02-20 | 2007-08-30 | Ihi Aerospace Co Ltd | Aluminum-impregnated three-dimensional c/c composite and method for producing the same |
| KR101205145B1 (en) | 2010-08-04 | 2012-11-26 | 이비덴 가부시키가이샤 | Carbon fiber reinforced carbon composite and method for manufacturing the same |
| KR101261728B1 (en) | 2010-08-04 | 2013-05-07 | 이비덴 가부시키가이샤 | C/c composite molded body and method for manufacturing the same |
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| JP4066896B2 (en) | 2008-03-26 |
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