JPH06173118A - Production of carbon fiber coated with silicon oxide - Google Patents
Production of carbon fiber coated with silicon oxideInfo
- Publication number
- JPH06173118A JPH06173118A JP32315292A JP32315292A JPH06173118A JP H06173118 A JPH06173118 A JP H06173118A JP 32315292 A JP32315292 A JP 32315292A JP 32315292 A JP32315292 A JP 32315292A JP H06173118 A JPH06173118 A JP H06173118A
- Authority
- JP
- Japan
- Prior art keywords
- pitch
- silicon oxide
- carbon fiber
- coated
- fiber
- 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.)
- Pending
Links
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、酸化珪素により被覆さ
れた炭素繊維の製造方法に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing carbon fibers coated with silicon oxide.
【０００２】本明細書において、“％”とあるのは、
“重量％”を意味するものとする。In this specification, "%" means
It shall mean "% by weight".
【０００３】[0003]
【従来技術とその問題点】酸化珪素被覆炭素繊維は、高
温酸化性雰囲気において優れた耐酸化性を発揮するとと
もに、金属、プラスチックなどに対して優れた密着性乃
至付着性を発揮する。2. Description of the Related Art Silicon oxide-coated carbon fibers exhibit excellent oxidation resistance in a high temperature oxidizing atmosphere, and exhibit excellent adhesion or adhesion to metals, plastics and the like.
【０００４】従来この様な酸化珪素被覆炭素繊維は、す
でに炭素化或いは黒鉛化した炭素繊維の表面に熱化学的
気相析出法などの方法により珪素含有物質を析出被覆さ
せることにより、製造されている。しかしながら、この
様な従来技術では、炭素繊維自体の製造に必要なエネル
ギーに加えて、表面への被覆操作時にも高温が必要とさ
れるので、大量の熱エネルギーがさらに必要となる。従
って、得られる酸化珪素被覆炭素繊維のコストが高くな
り、且つ製造工程が複雑で、長時間を要するという問題
点がある。Conventionally, such silicon oxide-coated carbon fibers have been produced by depositing and coating a silicon-containing substance on the surface of carbonized or graphitized carbon fibers by a method such as thermochemical vapor deposition. There is. However, in such a conventional technique, in addition to the energy required for producing the carbon fiber itself, a high temperature is required also during the coating operation on the surface, and thus a large amount of thermal energy is further required. Therefore, there are problems that the cost of the obtained silicon oxide-coated carbon fiber is high, the manufacturing process is complicated, and it takes a long time.
【０００５】[0005]
【発明が解決しようとする課題】従って、本発明は、エ
ネルギー消費が少なく、製造コストを低下させ得る新た
な酸化珪素被覆炭素繊維の製造方法を提供することを主
な目的とする。SUMMARY OF THE INVENTION Therefore, the main object of the present invention is to provide a new method for producing carbon fibers coated with silicon oxide which consumes less energy and can reduce the production cost.
【０００６】[0006]
【課題を解決するための手段】本発明者は、上記のよう
な技術の現状に鑑みて研究を進めた結果、従来技術の様
に炭素繊維形成後にその表面に珪素含有物質を析出させ
るのではなく、ピッチ繊維表面に特定の方法により非晶
質シリカを析出させた後、炭素化を行なう場合には、そ
の目的を達成し得ることを見出した。The present inventor has conducted research in view of the current state of the art as described above, and as a result, it was found that a silicon-containing substance may not be deposited on the surface of the carbon fiber after the carbon fiber is formed as in the prior art. However, it has been found that the purpose can be achieved when the amorphous carbon is deposited on the pitch fiber surface by a specific method and then carbonized.
【０００７】即ち、本発明は、下記の酸化珪素被覆炭素
繊維の製造方法を提供するものである： １ ピッチを溶融紡糸し、得られたピッチ繊維を不融化
し、炭素化して炭素繊維を製造するに際し、低温プラズ
マ気相析出法により常温から２００℃で有機珪素化合物
を導入しつつピッチ繊維表面に非晶質シリカを析出させ
た後、これを不融化し、１０００〜１５００℃で炭素化
することを特徴とする酸化珪素により被覆された炭素繊
維の製造方法。That is, the present invention provides the following method for producing a carbon fiber coated with silicon oxide: 1 Pitch is melt-spun and the obtained pitch fiber is infusible and carbonized to produce a carbon fiber. In this case, amorphous silica is deposited on the pitch fiber surface while introducing an organosilicon compound from room temperature to 200 ° C. by a low temperature plasma vapor deposition method, then infusible and carbonized at 1000 to 1500 ° C. A method for producing a carbon fiber coated with silicon oxide, comprising:
【０００８】本発明において出発原料として使用するピ
ッチは、特に制限されず、石炭系ピッチ、石油系ピッチ
および合成系ピッチのいずれであっても良く、また等方
性ピッチおよび異方性ピッチのいずれであっても良い。
石炭系ピッチとしては、コールタールピッチ、石炭液化
油などが例示される。石油系ピッチとしては、エチレン
タールなどが例示される。合成ピッチとしては、ナフタ
レンなどを原料として、例えば、特開平１−１３９６２
１号公報、特開平１−２５４７９６号公報などに開示さ
れた方法で製造されたピッチなどが例示される。また、
これらのピッチは、必要に応じて、比重差による沈降処
理、濾過、蒸留、溶剤抽出、水素化反応、重縮合反応な
どの公知の方法により改質した後、使用しても良い。ピ
ッチの軟化点は、特に限定されるものではないが、紡糸
性の観点からは、２２０〜３２０℃程度であることが好
ましく、２４０〜３００℃程度であることがより好まし
い。The pitch used as a starting material in the present invention is not particularly limited and may be any of coal pitch, petroleum pitch and synthetic pitch, and isotropic pitch or anisotropic pitch. May be
Examples of the coal-based pitch include coal tar pitch and coal liquefied oil. Examples of petroleum pitch include ethylene tar and the like. As the synthetic pitch, for example, naphthalene is used as a raw material, and for example, Japanese Patent Application Laid-Open No. 1-13962.
Examples include pitches manufactured by the method disclosed in Japanese Patent Laid-Open No. 1-2547996 and Japanese Patent Laid-Open No. 1-2547996. Also,
If necessary, these pitches may be used after being modified by a known method such as sedimentation treatment by specific gravity difference, filtration, distillation, solvent extraction, hydrogenation reaction and polycondensation reaction. The softening point of the pitch is not particularly limited, but from the viewpoint of spinnability, it is preferably about 220 to 320 ° C, more preferably about 240 to 300 ° C.
【０００９】ピッチの紡糸工程は、実質的に常法と異な
るところはない。即ち、原料ピッチをピッチの溶融温度
に対応した所定の温度で溶融し、紡糸して、ピッチ繊維
とすれば良い。The pitch spinning process is substantially the same as the conventional method. That is, the raw material pitch may be melted at a predetermined temperature corresponding to the melting temperature of the pitch and spun into pitch fibers.
【００１０】この様にして得られたピッチ繊維の表面に
は、次いでラジオ波、マイクロ波などを使用して有機珪
素化合物を導入する低温プラズマ気相析出法により、非
晶質シリカを析出させる。Amorphous silica is then deposited on the surface of the pitch fiber thus obtained by a low temperature plasma vapor deposition method in which an organosilicon compound is introduced by using radio waves, microwaves or the like.
【００１１】シリカ源としては、非晶質シリカを析出さ
せるための常温〜２００℃程度の低温の反応温度で揮発
可能な有機珪素化合物が広く一般に使用できる。この様
な有機珪素化合物としては、テトラエトキシシラン（Ｔ
ＥＯＳ）、テトラメトキシシラン、トリエチルシランな
どが例示される。As the silica source, an organosilicon compound which can be volatilized at a low reaction temperature of room temperature to about 200 ° C. for depositing amorphous silica can be widely and generally used. As such an organosilicon compound, tetraethoxysilane (T
EOS), tetramethoxysilane, triethylsilane and the like are exemplified.
【００１２】非晶質シリカの析出反応は、公知のラジオ
波、マイクロ波などを使用する低温プラズマ気相析出装
置を使用して常法に従って実施することができる。反応
は、特に限定されるものではないが、通常常温〜２００
℃程度の低温度で、この種のプラズマを継続的に保持し
得る減圧度（０．１〜１０torr程度）の条件下に行な
う。即ち、低温プラズマ気相析出装置に不融化ピッチ繊
維を配置し、所定の減圧条件下に装置内で酸素プラズマ
が安定した後、ＴＥＯＳなどの有機珪素化合物を装置内
に導入する。かくして、有機珪素化合物は、酸素プラズ
マの作用により分解されて、非晶質シリカとしてピッチ
繊維の表面に析出する。プラズマの作用により、ピッチ
繊維も加熱されるが、反応自体が低温で行なわれるの
で、軟化したり、溶融したりすることはない。The precipitation reaction of amorphous silica can be carried out by a conventional method using a known low-temperature plasma vapor deposition apparatus using radio waves, microwaves, or the like. The reaction is not particularly limited, but is usually room temperature to 200.
It is carried out at a low temperature of about 0 ° C. under the condition of a reduced pressure (about 0.1 to 10 torr) capable of continuously holding this kind of plasma. That is, the infusibilized pitch fiber is placed in the low temperature plasma vapor deposition apparatus, and oxygen plasma is stabilized in the apparatus under a predetermined depressurization condition, and then an organosilicon compound such as TEOS is introduced into the apparatus. Thus, the organosilicon compound is decomposed by the action of oxygen plasma and deposited as amorphous silica on the surface of the pitch fiber. Although the pitch fiber is also heated by the action of plasma, the reaction itself is carried out at a low temperature, so that it is not softened or melted.
【００１３】本発明方法で利用するラジオ波などを使用
する低温プラズマ法は、高周波誘導式無電極放電プラズ
マ法であるため、その装置の構造が簡単であり、また電
極を使用しないので、ガス純度の制御が容易で且つ不純
物の混入が回避できる。さらに、ピッチ繊維への非晶質
シリカによる被覆形成時の析出物の回り込み特性に優れ
ているので、ピッチ繊維が粗面状態である場合にも、非
晶質シリカによる被覆表面の平滑性が改善される。ま
た、ピッチ繊維が短繊維である場合には、破断面をも被
覆し得る。The low temperature plasma method using radio waves used in the method of the present invention is a high frequency induction type electrodeless discharge plasma method, so that the structure of the apparatus is simple and no electrodes are used. Can be easily controlled and contamination of impurities can be avoided. In addition, the excellent wraparound property of precipitates when forming a coating on pitch fibers with amorphous silica improves the smoothness of the surface coated with amorphous silica even when the pitch fibers are rough. To be done. When the pitch fiber is a short fiber, it can also cover the fracture surface.
【００１４】非晶質シリカで被覆されたピッチ繊維の不
融化工程は、常法と同様にして行なわれる。即ち、特に
限定されるものではないが、非晶質シリカ被覆ピッチ繊
維を含酸素雰囲気下に昇温温度０．５〜３℃／分程度、
保持温度２１０〜３５０℃程度、保持時間１時間程度ま
で（より好ましくは２〜３０分間程度）の条件を適宜組
合わせて不融化処理すれば良い。含酸素雰囲気として
も、特に限定されず、空気、酸素富化空気、酸素−不活
性ガス混合物などが例示される。炭素繊維の物性の改善
という観点からは、ピッチ繊維の半径方向に均一なプロ
ファイルとなる様に処理を行なうことが望ましい。The infusibilizing step of the pitch fiber coated with the amorphous silica is carried out in the same manner as a usual method. That is, although not particularly limited, the amorphous silica-coated pitch fiber is heated in an oxygen-containing atmosphere at a temperature rising temperature of about 0.5 to 3 ° C./minute,
The infusibilizing treatment may be performed by appropriately combining the conditions of holding temperature of about 210 to 350 ° C. and holding time of up to about 1 hour (more preferably about 2 to 30 minutes). The oxygen-containing atmosphere is not particularly limited, and examples thereof include air, oxygen-enriched air, and oxygen-inert gas mixture. From the viewpoint of improving the physical properties of the carbon fibers, it is desirable to perform the treatment so that the pitch fibers have a uniform profile in the radial direction.
【００１５】或いは、不融化の促進およびコストの削減
という観点からは、２５０℃以下の温度でＮＯ2 、オゾ
ンなどの酸化剤を含む雰囲気中で不融化処理を開始し、
その後必要に応じて最高３５０℃まで昇温して、不融化
を完了させても良い。但し、均一な不融化を目的とする
場合には、酸化剤を使用しないことが好ましい。従っ
て、酸化剤を使用するか否かは、目的に応じて決定すべ
きである。Alternatively, from the viewpoint of promoting the infusibilization and reducing the cost, the infusibilization treatment is started at a temperature of 250 ° C. or lower in an atmosphere containing an oxidizing agent such as NO 2 or ozone,
Thereafter, if necessary, the temperature may be raised up to 350 ° C. to complete the infusibilization. However, for the purpose of uniform infusibilization, it is preferable not to use an oxidizing agent. Therefore, whether or not to use the oxidant should be determined according to the purpose.
【００１６】本発明では、不融化を終えた非晶質シリカ
被覆ピッチ繊維は、次いで常法に従って予備炭化され
る。予備炭化は、特に限定されるものではないが、不活
性雰囲気中で通常昇温速度５〜３００℃／分程度（より
好ましくは１０〜１５０℃／分程度）、最高到達温度５
００〜１０００℃程度（より好ましくは６００〜８００
℃程度）での保持時間３〜２０分間程度の条件下に行な
われる。In the present invention, the amorphous silica-coated pitch fiber that has been infusibilized is then pre-carbonized by a conventional method. Preliminary carbonization is not particularly limited, but usually a temperature rising rate of about 5 to 300 ° C./min (more preferably about 10 to 150 ° C./min) in an inert atmosphere, and a maximum reached temperature of 5
About 00 to 1000 ° C (more preferably 600 to 800)
The holding time is about 3 to 20 minutes.
【００１７】予備炭化を終えた繊維は、常法に従って不
活性雰囲気中１０００〜１５００℃程度で炭化処理さ
れ、所望の酸化珪素被覆炭素繊維が得られる。The fiber which has been pre-carbonized is carbonized in an inert atmosphere at about 1000 to 1500 ° C. according to a conventional method to obtain a desired silicon oxide-coated carbon fiber.
【００１８】[0018]
【発明の効果】本発明方法によれば、下記の様な顕著な
効果が達成される。According to the method of the present invention, the following remarkable effects are achieved.
【００１９】（１）酸化珪素被覆炭素繊維の製造に際
し、エネルギー消費を低減させることができ、製造装置
も簡単なので、全体としての製造コストを低下させるこ
とができる。(1) When manufacturing the silicon oxide-coated carbon fiber, energy consumption can be reduced and the manufacturing apparatus is simple, so that the manufacturing cost as a whole can be reduced.
【００２０】（２）非晶質シリカで被覆されたピッチ繊
維の不融化および炭素化工程において、生成した低分子
量成分が繊維から留出するとともに、繊維内では重縮合
などの反応が進行するので、繊維体積が収縮減少する。
一方、繊維表面に被覆形成された非晶質シリカも、脱水
素および結晶化により体積が収縮減少するので、従来法
による酸化珪素被覆炭素繊維に比して、酸化珪素被覆層
と炭素繊維との界面での密着性が向上する。(2) In the process of infusibilizing and carbonizing the pitch fiber coated with amorphous silica, the produced low molecular weight component is distilled out from the fiber, and a reaction such as polycondensation proceeds in the fiber. , The fiber volume shrinks and decreases.
On the other hand, since the volume of the amorphous silica coated on the surface of the fiber also shrinks due to dehydrogenation and crystallization, the volume of the silicon oxide coating layer and the carbon fiber is smaller than that of the conventional silicon oxide-coated carbon fiber. Adhesion at the interface is improved.
【００２１】[0021]
【実施例】以下に実施例および比較例を示し、本発明の
特徴とするところをより一層明確にする。EXAMPLES Examples and comparative examples will be shown below to further clarify the features of the present invention.
【００２２】実施例１ 常法に従って軟化点２７０℃の等方性ピッチを溶融紡糸
して、繊維径１４μｍのピッチ繊維を得た後、これをラ
ジオ波を使用する低温プラズマ気相析出装置のガラス製
反応器内に充填した。次いで、反応器内を減圧して残存
ガスを除去した後、酸素ガスを導入して反応器内を１to
rrに調整した。Example 1 Isotropic pitch having a softening point of 270 ° C. was melt-spun according to a conventional method to obtain pitch fibers having a fiber diameter of 14 μm, which were then used in a glass of a low temperature plasma vapor deposition apparatus using radio waves. It was filled in the reactor. Next, after decompressing the inside of the reactor to remove residual gas, oxygen gas was introduced to move the inside of the reactor to 1 to
Adjusted to rr.
【００２３】次ぎに、反応器周囲に取り付けた高周波コ
イルに通電してプラズマを発生させ、プラズマが安定し
た時点で、約３０℃に保温した反応容器内に１ｍｇ／分
の割合でＴＥＯＳを導入した。９分間反応を継続するこ
とにより、非晶質シリカで被覆されたピッチ繊維を得
た。このピッチ繊維におけるシリカの重量分率は、２．
１％であった。Next, a high-frequency coil mounted around the reactor was energized to generate plasma, and when the plasma became stable, TEOS was introduced at a rate of 1 mg / min into the reaction vessel kept at about 30 ° C. . By continuing the reaction for 9 minutes, pitch fibers coated with amorphous silica were obtained. The weight fraction of silica in this pitch fiber is 2.
It was 1%.
【００２４】上記の様にして得られた非晶質シリカ被覆
ピッチ繊維を空気中２．５℃／分の速度で３５０℃まで
昇温させた後、同温度に１５分間保持して不融化を行な
った。The amorphous silica-coated pitch fiber obtained as described above was heated in air at a rate of 2.5 ° C./minute to 350 ° C., and then kept at the same temperature for 15 minutes for infusibilization. I did.
【００２５】次いで、反応器内をアルゴンガスにより置
換した後、１０００℃まで昇温し、同温度で１時間保持
することにより、酸化珪素被覆炭素繊維を製造した。Next, after replacing the inside of the reactor with argon gas, the temperature was raised to 1000 ° C. and the temperature was maintained for 1 hour to produce a silicon oxide-coated carbon fiber.
【００２６】この酸化珪素被覆炭素繊維における酸化珪
素被覆層の厚さは、平均５００ｎｍであり、その表面
は、平滑であった。The thickness of the silicon oxide coating layer in this silicon oxide coating carbon fiber was 500 nm on average, and the surface was smooth.
【００２７】この酸化珪素被覆炭素繊維の耐酸化性を調
べるために、空気中毎分１０℃の速度で６００℃まで昇
温加熱したところ、重量減少は２１％であった。In order to investigate the oxidation resistance of this silicon oxide-coated carbon fiber, when it was heated in air at a rate of 10 ° C./min to 600 ° C., the weight loss was 21%.
【００２８】実施例２ 等方性ピッチに代えて光学的に異方性ピッチ（軟化点２
８３℃、光学的異方性量９８％）を使用する以外は実施
例１と同様にして，酸化珪素被覆炭素繊維を得た。Example 2 Instead of an isotropic pitch, an optically anisotropic pitch (softening point 2
A silicon oxide-coated carbon fiber was obtained in the same manner as in Example 1 except that 83 ° C. and an optical anisotropy amount of 98%) were used.
【００２９】この酸化珪素被覆炭素繊維の耐酸化性を調
べるために、空気中毎分１０℃の速度で６００℃まで昇
温加熱したところ、重量減少は１９％であった。In order to examine the oxidation resistance of this silicon oxide-coated carbon fiber, when the temperature was raised to 600 ° C. in air at a rate of 10 ° C./min, the weight loss was 19%.
【００３０】比較例１ ピッチ繊維に非晶質シリカを被覆しない以外は実施例１
と同様にして炭素繊維を得た。Comparative Example 1 Example 1 except that the pitch fibers were not coated with amorphous silica.
A carbon fiber was obtained in the same manner as in.
【００３１】得られた炭素繊維のの耐酸化性を調べるた
めに、空気中毎分１０℃の速度で６００℃まで昇温加熱
したところ、重量減少は５０％にも達していた。In order to examine the oxidation resistance of the obtained carbon fiber, when the temperature was raised to 600 ° C. in air at a rate of 10 ° C./min, the weight loss reached 50%.
Claims (1)
維を不融化し、炭素化して炭素繊維を製造するに際し、
低温プラズマ気相析出法により常温乃至２００℃で有機
珪素化合物を導入しつつピッチ繊維表面に非晶質シリカ
を析出させた後、これを不融化し、１０００〜１５００
℃で炭素化することを特徴とする酸化珪素により被覆さ
れた炭素繊維の製造方法。1. When melt-spinning pitch, infusibilizing the pitch fiber obtained and carbonizing to produce carbon fiber,
After depositing amorphous silica on the pitch fiber surface while introducing an organic silicon compound at room temperature to 200 ° C. by the low temperature plasma vapor deposition method, it is made infusible and 1000 to 1500
A method for producing a carbon fiber coated with silicon oxide, which comprises carbonizing at ℃.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP32315292A JPH06173118A (en) | 1992-12-02 | 1992-12-02 | Production of carbon fiber coated with silicon oxide |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP32315292A JPH06173118A (en) | 1992-12-02 | 1992-12-02 | Production of carbon fiber coated with silicon oxide |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH06173118A true JPH06173118A (en) | 1994-06-21 |
Family
ID=18151667
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP32315292A Pending JPH06173118A (en) | 1992-12-02 | 1992-12-02 | Production of carbon fiber coated with silicon oxide |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH06173118A (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6541113B1 (en) | 1998-07-24 | 2003-04-01 | Cabot Corporation | Methods for preparing silica-coated carbon products |
| JP2004036073A (en) * | 2002-07-10 | 2004-02-05 | Advanced Composite Materials Corp | Silicon carbide fiber practically containing no whisker and method for producing the same |
| JP2007107151A (en) * | 2005-10-17 | 2007-04-26 | Showa Denko Kk | Silica-coated carbon fiber |
| US9688583B2 (en) | 2006-03-30 | 2017-06-27 | Advanced Composite Materials, Llc | Composite materials and devices comprising single crystal silicon carbide heated by electromagnetic radiation |
| JP2017524835A (en) * | 2014-06-25 | 2017-08-31 | シーメンス アクチエンゲゼルシヤフトＳｉｅｍｅｎｓ Ａｋｔｉｅｎｇｅｓｅｌｌｓｃｈａｆｔ | Carbon fiber having a modified surface, method for modifying carbon fiber surface, and use of carbon fiber |
| JP2018197186A (en) * | 2014-03-31 | 2018-12-13 | 日本製紙株式会社 | Fiber composite and production method thereof |
-
1992
- 1992-12-02 JP JP32315292A patent/JPH06173118A/en active Pending
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6541113B1 (en) | 1998-07-24 | 2003-04-01 | Cabot Corporation | Methods for preparing silica-coated carbon products |
| JP2004036073A (en) * | 2002-07-10 | 2004-02-05 | Advanced Composite Materials Corp | Silicon carbide fiber practically containing no whisker and method for producing the same |
| JP4612287B2 (en) * | 2002-07-10 | 2011-01-12 | アドヴァンスド・コンポジット・マテリアルズ・コーポレーション | Silicon carbide fiber substantially free of whiskers and method for producing the same |
| JP2007107151A (en) * | 2005-10-17 | 2007-04-26 | Showa Denko Kk | Silica-coated carbon fiber |
| US9688583B2 (en) | 2006-03-30 | 2017-06-27 | Advanced Composite Materials, Llc | Composite materials and devices comprising single crystal silicon carbide heated by electromagnetic radiation |
| JP2018197186A (en) * | 2014-03-31 | 2018-12-13 | 日本製紙株式会社 | Fiber composite and production method thereof |
| JP2017524835A (en) * | 2014-06-25 | 2017-08-31 | シーメンス アクチエンゲゼルシヤフトＳｉｅｍｅｎｓ Ａｋｔｉｅｎｇｅｓｅｌｌｓｃｈａｆｔ | Carbon fiber having a modified surface, method for modifying carbon fiber surface, and use of carbon fiber |
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