JP3383989B2 - Method for producing carbon fiber reinforced carbon composite - Google Patents
Method for producing carbon fiber reinforced carbon compositeInfo
- Publication number
- JP3383989B2 JP3383989B2 JP15699892A JP15699892A JP3383989B2 JP 3383989 B2 JP3383989 B2 JP 3383989B2 JP 15699892 A JP15699892 A JP 15699892A JP 15699892 A JP15699892 A JP 15699892A JP 3383989 B2 JP3383989 B2 JP 3383989B2
- Authority
- JP
- Japan
- Prior art keywords
- carbon fiber
- composite material
- carbon
- length
- fiber bundle
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
- 229920000049 Carbon (fiber) Polymers 0.000 title claims description 36
- 239000004917 carbon fiber Substances 0.000 title claims description 36
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 title claims description 26
- 239000002131 composite material Substances 0.000 title claims description 25
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 title claims description 12
- 229910052799 carbon Inorganic materials 0.000 title claims description 12
- 238000004519 manufacturing process Methods 0.000 title claims description 6
- 239000000835 fiber Substances 0.000 claims description 22
- 238000000034 method Methods 0.000 claims description 13
- 239000011347 resin Substances 0.000 claims description 6
- 229920005989 resin Polymers 0.000 claims description 6
- 238000000265 homogenisation Methods 0.000 claims description 2
- 239000011295 pitch Substances 0.000 description 10
- 238000010304 firing Methods 0.000 description 6
- 239000007789 gas Substances 0.000 description 5
- 239000011159 matrix material Substances 0.000 description 5
- 239000005011 phenolic resin Substances 0.000 description 5
- 239000002904 solvent Substances 0.000 description 5
- CSCPPACGZOOCGX-UHFFFAOYSA-N Acetone Chemical compound CC(C)=O CSCPPACGZOOCGX-UHFFFAOYSA-N 0.000 description 4
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 4
- MWPLVEDNUUSJAV-UHFFFAOYSA-N anthracene Chemical compound C1=CC=CC2=CC3=CC=CC=C3C=C21 MWPLVEDNUUSJAV-UHFFFAOYSA-N 0.000 description 4
- 239000007849 furan resin Substances 0.000 description 4
- 238000010438 heat treatment Methods 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- 239000000126 substance Substances 0.000 description 3
- 229920000297 Rayon Polymers 0.000 description 2
- 239000011300 coal pitch Substances 0.000 description 2
- 239000011280 coal tar Substances 0.000 description 2
- 238000000280 densification Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000006698 induction Effects 0.000 description 2
- 238000000465 moulding Methods 0.000 description 2
- 239000002296 pyrolytic carbon Substances 0.000 description 2
- 239000002964 rayon Substances 0.000 description 2
- 229920001187 thermosetting polymer Polymers 0.000 description 2
- WSLDOOZREJYCGB-UHFFFAOYSA-N 1,2-Dichloroethane Chemical group ClCCCl WSLDOOZREJYCGB-UHFFFAOYSA-N 0.000 description 1
- 229910018072 Al 2 O 3 Inorganic materials 0.000 description 1
- 102000009123 Fibrin Human genes 0.000 description 1
- 108010073385 Fibrin Proteins 0.000 description 1
- BWGVNKXGVNDBDI-UHFFFAOYSA-N Fibrin monomer Chemical compound CNC(=O)CNC(=O)CN BWGVNKXGVNDBDI-UHFFFAOYSA-N 0.000 description 1
- AEMRFAOFKBGASW-UHFFFAOYSA-M Glycolate Chemical compound OCC([O-])=O AEMRFAOFKBGASW-UHFFFAOYSA-M 0.000 description 1
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 description 1
- 239000004372 Polyvinyl alcohol Substances 0.000 description 1
- 238000010009 beating Methods 0.000 description 1
- 125000004432 carbon atom Chemical group C* 0.000 description 1
- 239000006229 carbon black Substances 0.000 description 1
- 239000012159 carrier gas Substances 0.000 description 1
- 239000000805 composite resin Substances 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 229950003499 fibrin Drugs 0.000 description 1
- 238000009415 formwork Methods 0.000 description 1
- 238000005087 graphitization Methods 0.000 description 1
- 150000008282 halocarbons Chemical class 0.000 description 1
- 229930195733 hydrocarbon Natural products 0.000 description 1
- 150000002430 hydrocarbons Chemical class 0.000 description 1
- 239000011261 inert gas Substances 0.000 description 1
- 239000012784 inorganic fiber Substances 0.000 description 1
- 238000010030 laminating Methods 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 229910003465 moissanite Inorganic materials 0.000 description 1
- 239000003960 organic solvent Substances 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- 239000011301 petroleum pitch Substances 0.000 description 1
- 229920002451 polyvinyl alcohol Polymers 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 229910010271 silicon carbide Inorganic materials 0.000 description 1
- 229910052708 sodium Inorganic materials 0.000 description 1
- 239000011734 sodium Substances 0.000 description 1
- 238000009987 spinning Methods 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
- 229920005992 thermoplastic resin Polymers 0.000 description 1
- 239000002562 thickening agent Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Landscapes
- Braking Arrangements (AREA)
- Ceramic Products (AREA)
Description
【発明の詳細な説明】Detailed Description of the Invention
【０００１】[0001]
【産業上の利用分野】本発明は、強度及び摩擦、摺動特
性に優れた炭素繊維強化炭素複合材の摩擦係数の制御に
関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to controlling the coefficient of friction of a carbon fiber reinforced carbon composite material having excellent strength, friction and sliding characteristics.
【０００２】[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
酸化性雰囲気におて６００〜２５００℃で焼成すること
により製造されている。2. Description of the Related Art Generally, carbon fiber reinforced carbon composite materials (hereinafter referred to as "C / C composite materials") are made of PAN-based, pitch-based or rayon-based long-short carbon fibers and phenol resin.
It is manufactured by impregnating or mixing a thermosetting resin such as a furan resin or a thermoplastic resin such as pitches, and then heat-molding the mixture, which is fired at 600 to 2500 ° C. in a non-oxidizing atmosphere. .
【０００３】摩擦係数を制御する方法としては、例えば
特公昭６０−５４２７０号公報に見られるように、コー
ルタールまたはコールタールおよび／もしくはピッチと
フラン樹脂とを含浸させて制御する方法、又、特公平１
−５９４５９号公報に見られるように比較的長い繊維
（４〜６ｃｍ）と短い繊維（０．０１５〜０．３ｃｍ）
をランダムに配向させる方法、さらに特公平３−７８４
９８号公報に見られるように円筒の軸と直角な面を横切
るように炭素繊維が配向している炭素繊維強化熱硬化性
樹脂複合材を円筒の軸と直角な方向へ切断し、焼成、緻
密化し、摺動面に対して炭素繊維が角度をもって配向さ
せる方法が知られている。As a method of controlling the coefficient of friction, for example, as disclosed in Japanese Patent Publication No. 60-54270, a method of controlling by impregnating coal tar or coal tar and / or pitch with a furan resin, or a special method. Fairness 1
Relatively long fibers (4-6 cm) and short fibers (0.015-0.3 cm) as seen in -59459.
Method for randomly orienting, and Japanese Patent Publication No. 3-784
As disclosed in Japanese Patent Publication No. 98, a carbon fiber reinforced thermosetting resin composite material in which carbon fibers are oriented so as to cross a plane perpendicular to the axis of the cylinder is cut in a direction perpendicular to the axis of the cylinder, baked, and densified. It is known that the carbon fibers are oriented at an angle with respect to the sliding surface.
【０００４】[0004]
【発明が解決しようとする課題】しかしながら、上記特
公昭６０−５４２７０号公報に記載の方法ではマトリッ
クスのみに注目して本質的な炭素繊維の配向性について
は言及されておらず、又特公平１−５９４５９号公報に
記載の方法では、２種類の異なった炭素繊維を混合しな
くてはならず、且つ炭素繊維長の具体的な効果も示され
ていなかった。さらに特公平３−７８４９８号公報に記
載の方法では、円筒の軸と直角な面を横切るように炭素
繊維が配向したディスクを輪切りにしなければならず、
工程が複雑となる問題があった。さらに上記すべての方
法では摩擦係数の制御という観点からは、具体的な例示
もなく、単に一般的傾向を示しているだけであった。However, in the method described in Japanese Patent Publication No. 60-54270, only the matrix is focused on and the essential orientation of carbon fibers is not mentioned, and Japanese Patent Publication No. In the method described in Japanese Patent No. 59459, two different kinds of carbon fibers have to be mixed, and the specific effect of the carbon fiber length has not been shown. Furthermore, in the method described in Japanese Patent Publication No. 3-78498, a disk in which carbon fibers are oriented so as to cross a plane perpendicular to the axis of the cylinder must be sliced.
There was a problem that the process became complicated. Further, in all of the above methods, from the viewpoint of controlling the friction coefficient, there is no specific example, and only a general tendency is shown.
【０００５】[0005]
【課題を解決するための手段】そこで、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たところ、短繊維状の炭素繊維束
を乾式又は湿式解繊し、２次元ランダムに配向したシー
トを作製し、樹脂又はピッチを含浸後積層して成形した
後に従来法に基づいてＣ／Ｃ複合材とする際に、該短繊
維状の炭素繊維束の長さを変えることにより、上記課題
が解決できることを知得し、本発明を完成するに到っ
た。Therefore, the present inventors have
In order to solve such a problem, when the C / C composite material using short fibers was earnestly studied, a short-fiber-like carbon fiber bundle was dry- or wet-defibrated to prepare a two-dimensional randomly oriented sheet, and a resin was prepared. Alternatively, it is known that the above problems can be solved by changing the length of the short fibrous carbon fiber bundle when a C / C composite material is formed based on a conventional method after being impregnated with pitch, laminated and molded. Then, the present invention has been completed.
【０００６】即ち本発明の目的は、Ｃ／Ｃ複合材の摩擦
係数を制御することであり、その目的は、複数の単繊維
からなる短繊維状の炭素繊維束を乾式又は湿式解繊し、
繊維が２次元ランダムに配向したシートを作製し、樹脂
又はピッチを含浸後、積層して成形した後に、焼成、緻
密化処理する炭素繊維強化炭素複合材の製造方法におい
て、炭素繊維強化炭素複合材の摩擦係数（μ）と、該短
繊維状の炭素繊維束の長さとの相関を求め、これに基づ
いて摩擦係数（μ）を制御することを特徴とする炭素繊
維強化炭素複合材の製造方法により容易に達成される。That is, the object of the present invention is to control the coefficient of friction of a C / C composite material, and the object is to dry or wet defibrate short fiber carbon fiber bundles composed of a plurality of single fibers,
A method for producing a carbon fiber-reinforced carbon composite material, comprising producing a sheet in which fibers are two-dimensionally randomly oriented, impregnating a resin or pitch, laminating and molding, and then firing and densifying the carbon fiber-reinforced carbon composite material. Of friction coefficient (μ) and the length of the short fiber-shaped carbon fiber bundle, and controlling the friction coefficient (μ) based on the correlation More easily achieved.
【０００７】以下、本発明を詳細に説明する。本発明で
用いる炭素繊維としては、ピッチ系、ＰＡＮ系或いはレ
ーヨン系炭素繊維等のいずれのものも使用できる。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。用いられる
炭素繊維の形態としては、複数の単繊維から成るトウ、
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状の
炭素繊維束（以下短繊維束という）を用いるのが好まし
い。そして、これらの短繊維束は複数の単繊維の束、具
体的には通常１０００本〜８０００本、好ましくは２０
００〜６０００本から形成されており、本発明において
は、通常長さが０．３〜１００ｍｍ、好ましくは長さが
５〜５０ｍｍ程度で均一化度が±１％以内のものが９９
％以上である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。この時使用する短繊維束の長さにより摩擦係
数を制御することが可能である。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。The present invention will be described in detail below. As the carbon fiber used in the present invention, any of pitch-based, PAN-based or rayon-based carbon fiber can be used. Further, if necessary, inorganic fibers such as SiC, Al 2 O 3 and carbon black, and inorganic substances may be added. The form of carbon fiber used is a tow composed of a plurality of single fibers,
It is preferably in the form of strands, rovings, yarns, etc., and it is preferable to use short fiber-like carbon fiber bundles obtained by cutting these (hereinafter referred to as short fiber bundles). These short fiber bundles are bundles of a plurality of single fibers, specifically, usually 1000 to 8000, preferably 20.
In the present invention, the length is usually 0.3 to 100 mm, preferably about 5 to 50 mm and the degree of homogenization is within ± 1%.
Use short fiber bundles that are at least%. The diameter and elastic modulus of the carbon fiber itself are not particularly limited within the range generally used as a composite material. The friction coefficient can be controlled by the length of the short fiber bundle used at this time. In the case of making a C / C composite material, it is important to disintegrate and disperse the short fiber bundle to prepare a two-dimensional random sheet, and to fill the matrix substance between them in order to improve the characteristics.
【０００８】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ものフィラメント化し、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。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 for producing a sheet that is two-dimensionally randomly oriented, for example, carbon fibers are mechanically formed into filaments commonly used in spinning, and the sheet is produced using a random webber, Alternatively, there is a method of producing a sheet by defibrating with air.
【０００９】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型枠等に少量ず
つ供給したり、解繊後撹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、炭素数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。As a method for wet-defibration to produce a two-dimensional randomly oriented sheet, for example, a beater usually used for beating of pulp or the like or a pulper used for defibration is used in a solvent. After defibrating the short fibrous carbon fibers with, for example, by supplying little by little to a formwork or the like having a screen at the bottom, or evenly dispersing by means such as stirring after defibration,
There is a method in which after paper making with a wire net or the like, the paper is dried and produced. As the solvent for uniformly dispersing the short fibrous carbon fibers, water, acetone, alcohol having 1 to 5 carbon atoms, anthracene oil, or the like is preferably used, but other organic solvents may be used. Further, it is preferable to disperse or dissolve the phenol resin, furan resin, pitch, or the like in the solvent because the carbon fibers are bonded to each other and the handling in the next step is easier. Furthermore, it is preferable to add a thickening agent such as sodium fibrin glycolate, polyvinyl alcohol, or hydroxycellulose to the solvent because the effect is further increased.
【００１０】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。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８００〜２５００
℃まで昇温し、焼成してＣ／Ｃ複合材を得る。Various sheet weights (weight per 1 m 2 ) can be taken, but 10-500 g / m 2 is optimal in view of handleability, impregnating property and uniformity. The two-dimensional randomly oriented sheet thus obtained is impregnated with a phenol resin, furan resin, or a matrix such as petroleum-based or coal-based pitch and then dried. At this time, the matrix used is one that is dissolved in a solvent such as alcohol, acetone, or anthracene oil and adjusted to have an appropriate viscosity. Then, the dried sheets are stacked, filled in a mold, and pressure-molded at a temperature of 100 to 500 ° C. to obtain a molded body having Vf (fiber content) = 5 to 65%, preferably 10 to 55%. obtain. Then, 800 to 2500 at a temperature rising rate of 1 to 200 ° C./h in an inert gas atmosphere such as N 2 gas.
C / C composite material is obtained by heating to ℃ and firing.
【００１１】上記焼成したＣ／Ｃ複合材を適宜、例えば
次の３種類のマトリックスを単独又は組み合わせること
により緻密化処理を行い、さらに性能の向上を図るのが
良い。
１）樹脂又はピッチによる緻密化処理
所定温度に加熱された槽に上記Ｃ／Ｃ複合材を載置し、
槽内を真空とした後、樹脂又は溶融ピッチを供給し、焼
成により生じた空隙にマトリックスを含浸する。この後
再度８００〜２５００℃の温度で焼成する。上記工程を
繰り返すことにより目的のＣ／Ｃ複合材の緻密化処理を
行う。
２）ＣＶＤによる緻密化処理
誘導加熱コイル等により反応器内に載置した上記Ｃ／Ｃ
複合材を加熱し、炭化水素類或いはハロゲン化炭化水素
類の蒸気をＨ2ガス、Ａｒガス或いはＮ2ガスと共に反応
器内へ供給し、生成する熱分解炭素で空隙を含浸し緻密
化する。更に必要に応じて黒鉛化処理を行うことができ
る。The fired C / C composite material may be appropriately densified by using, for example, the following three types of matrices alone or in combination to further improve the performance. 1) Densification treatment with resin or pitch Place the C / C composite material in a tank heated to a predetermined temperature,
After the inside of the tank is evacuated, resin or molten pitch is supplied, and the voids formed by firing are impregnated with the matrix. After that, firing is performed again at a temperature of 800 to 2500 ° C. By repeating the above steps, the target C / C composite material is densified. 2) Densification treatment by CVD The above C / C placed in the reactor by an induction heating coil or the like
The composite material is heated, and vapors of hydrocarbons or halogenated hydrocarbons are supplied into the reactor together with H 2 gas, Ar gas or N 2 gas, and the generated pyrolytic carbon impregnates the voids to densify the same. Furthermore, graphitization treatment can be performed if necessary.
【００１２】そして本発明の特徴は、短繊維束の長さを
変更することにより、摩擦係数（μ）を制御することに
ある。短繊維束の長さと、摩擦係数の相関は、短繊維束
の長さのみを変え、他の製造条件を一致させたＣ／Ｃ材
を製造し、実際に数点を測定することによって求める。
実際の相関関係については、条件によっても異なるが、
一般には１次式の形で求めれば十分である。そして摩擦
係数は通常短繊維束の長さが長くなれば低くなることが
多い。従ってこの相関関係は、下記式Ｉのように表され
ることが多い。A feature of the present invention is to control the friction coefficient (μ) by changing the length of the short fiber bundle. The correlation between the length of the short fiber bundle and the coefficient of friction is determined by changing the length of the short fiber bundle only, producing a C / C material that matches other production conditions, and actually measuring several points.
The actual correlation depends on the conditions,
Generally, it is sufficient to obtain it in the form of a linear equation. The coefficient of friction usually decreases as the length of the short fiber bundle increases. Therefore, this correlation is often expressed by the following formula I.
【００１３】
摩擦係数μ＝−Ａ×（短繊維束長（ｍｍ））＋Ｂ． ・・・（式Ｉ）
そして、求める摩擦係数が、同一の製造により製造され
たＣ／Ｃ材同士である場合、上述の式Ｉにおいて、０．
０００５≦Ａ≦０．００５、−０．０５≦Ｂ≦０．０５
程度の値となる。そして、この場合得られる摩擦係数の
誤差の範囲は、およそ±０．０５以内に抑えることがで
きる。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こえない限り、下記実施例に限
定されるものではない。Friction coefficient μ = −A × (short fiber bundle length (mm)) + B. (Equation I) When the obtained coefficient of friction is between C / C materials manufactured by the same manufacturing, in the above-described expression I, 0.
0005≤A≤0.005, -0.05≤B≤0.05
It becomes a value of the degree. The error range of the friction coefficient obtained in this case can be suppressed within about ± 0.05. Hereinafter, the present invention will be described in detail with reference to Examples, but the present invention is not limited to the following Examples unless it exceeds the gist.
【００１４】[0014]
【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束を１０±
０．１ｍｍ長に１００％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が約５０％の成形体
を得た。この成形体を２０００℃迄焼成した後、高周波
誘導加熱装置により５５０℃に加熱し、ジクロロエチレ
ン蒸気を、Ｎ2ガスをキャリアーガスとして反応容器内
に導入して熱分解炭素により、気孔を充填する緻密化処
理を行った。The present invention will be described in more detail with reference to the following examples. Example 1 A pitch-based carbon fiber bundle having 4000 filaments was used for 10 ±
200 g with 100% cut into 0.1 mm length disintegrated with a random webber and two-dimensionally randomly oriented basis weight
A sheet of / m 2 was obtained. This sheet was impregnated with a phenol resin diluted with ethanol and then dried to obtain 200 g /
A sheet was prepared by impregnating m 2 of carbon fiber with 130 g / m 2 of phenol resin. This sheet was laminated in a mold and pressure-molded at 250 ° C. to obtain a molded body having Vf of about 50%. After firing this molded body to 2000 ° C., it is heated to 550 ° C. by a high-frequency induction heating device, dichloroethylene vapor is introduced into the reaction vessel as a carrier gas of N 2 gas, and the pores are filled with pyrolytic carbon. The chemical treatment was performed.
【００１５】次いで、ピッチを含浸後１０００℃迄焼成
する。さらに同様の含浸−焼成の操作を再度繰り返し、
その後２０００℃の熱処理を行って気孔率１３％のＣ／
Ｃ複合材を得た。このＣ／Ｃ複合材の回転数５０００ｒ
ｐｍ、面圧１０ｋｇ／ｃｍ2の条件での１００回繰り返
しの平均摩擦係数は０．２０７であった。同様にして、
炭素繊維束長を３０±０．１ｍｍ長及び５０±０．１ｍ
ｍ長に１００％切断したものを用いた以外は同様にして
気孔率１３％のＣ／Ｃ複合材を得、平均摩擦係数を求め
たところ、それぞれ０．１８８、０．１３８となった。Then, after impregnating the pitch, it is fired up to 1000.degree. Further, the same impregnation-firing operation is repeated again,
After that, heat treatment at 2000 ° C. is performed to form C / with a porosity of 13%.
A C composite material was obtained. The rotation speed of this C / C composite material is 5000r
The average friction coefficient of 100 times repeated under the conditions of pm and surface pressure of 10 kg / cm 2 was 0.207. Similarly,
Carbon fiber bundle length 30 ± 0.1mm length and 50 ± 0.1m
A C / C composite material having a porosity of 13% was obtained in the same manner except that a material cut to 100 m in length was used, and the average friction coefficient was 0.188 and 0.138, respectively.
【００１６】これらよりＣ／Ｃ複合材の炭素繊維束長
（ｍｍ）と摩擦係数の関係は
μ＝−０．００１７３×炭素繊維束長（ｍｍ）＋０．２
２９
誤差範囲０．０１１と求められ、摩擦係数と炭素繊維束
長が一次の相関を持つことが確認できた。次いで、この
相関関係に基づき、炭素繊維束長を変えることにより、
所望の摩擦係数を有するＣ／Ｃ複合材を精度よく得るこ
とができた。From these, the relationship between the carbon fiber bundle length (mm) of the C / C composite material and the friction coefficient is μ = −0.00173 × carbon fiber bundle length (mm) +0.2
29 An error range of 0.011 was obtained, and it was confirmed that the friction coefficient and the carbon fiber bundle length had a linear correlation. Then, based on this correlation, by changing the carbon fiber bundle length,
It was possible to accurately obtain a C / C composite material having a desired friction coefficient.
【００１７】[0017]
【発明の効果】本発明によりＣ／Ｃ複合材の摩擦係数を
制御することが可能となった。The present invention makes it possible to control the friction coefficient of a C / C composite material.
───────────────────────────────────────────────────── フロントページの続き (56)参考文献 特開 平３−140211（ＪＰ，Ａ) 特開 昭62−119288（ＪＰ，Ａ) (58)調査した分野(Int.Cl.7，ＤＢ名) C04B 35/83 ─────────────────────────────────────────────────── ─── Continuation of the front page (56) Reference JP-A-3-140211 (JP, A) JP-A-62-119288 (JP, A) (58) Fields investigated (Int.Cl. 7 , DB name) C04B 35/83
Claims (2)
維束を乾式又は湿式解繊し、繊維が２次元ランダムに配
向したシートを作製し、樹脂又はピッチを含浸後、積層
して成形した後に、焼成、緻密化処理する炭素繊維強化
炭素複合材の製造方法において、得られる炭素繊維強化
炭素複合材の摩擦係数（μ）と、該短繊維状の炭素繊維
束の長さとの相関を求めておき、これに基づいて所期の
摩擦係数を有する炭素繊維強化炭素複合材が得られるよ
うに用いる炭素繊維束の長さを決定することを特徴とす
る方法。 1. A sheet in which short fiber-like carbon fiber bundles composed of a plurality of single fibers are dry or wet defibrated to fabricate a sheet in which fibers are two-dimensionally randomly oriented, impregnated with resin or pitch, and then laminated and molded. After that, in the method for producing a carbon fiber-reinforced carbon composite material, which is fired and densified, the correlation between the friction coefficient (μ) of the obtained carbon fiber-reinforced carbon composite material and the length of the short fibrous carbon fiber bundle is determined. I asked leave, of the intended on the basis of this
Carbon fiber reinforced carbon composite material with friction coefficient can be obtained
Characterized by determining the length of the carbon fiber bundle used for
How to do.
で均一化度が±１％以内のものが９９％以上であるものThe degree of homogenization within ± 1% is 99% or more.
を用いることを特徴とする請求項１記載の方法。The method according to claim 1, characterized in that
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP15699892A JP3383989B2 (en) | 1992-06-16 | 1992-06-16 | Method for producing carbon fiber reinforced carbon composite |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP15699892A JP3383989B2 (en) | 1992-06-16 | 1992-06-16 | Method for producing carbon fiber reinforced carbon composite |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH05345667A JPH05345667A (en) | 1993-12-27 |
| JP3383989B2 true JP3383989B2 (en) | 2003-03-10 |
Family
ID=15639955
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP15699892A Expired - Lifetime JP3383989B2 (en) | 1992-06-16 | 1992-06-16 | Method for producing carbon fiber reinforced carbon composite |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3383989B2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE10164229B4 (en) * | 2001-12-31 | 2006-03-09 | Sgl Carbon Ag | Friction discs, process for their preparation and their use |
-
1992
- 1992-06-16 JP JP15699892A patent/JP3383989B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH05345667A (en) | 1993-12-27 |
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