JPH02116672A - Production of carbon fiber/carbon composite cylindrical body - Google Patents
Production of carbon fiber/carbon composite cylindrical bodyInfo
- Publication number
- JPH02116672A JPH02116672A JP63267092A JP26709288A JPH02116672A JP H02116672 A JPH02116672 A JP H02116672A JP 63267092 A JP63267092 A JP 63267092A JP 26709288 A JP26709288 A JP 26709288A JP H02116672 A JPH02116672 A JP H02116672A
- Authority
- JP
- Japan
- Prior art keywords
- mandrel
- prepreg
- carbon
- carbon fiber
- cylindrical body
- 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
- 229920000049 Carbon (fiber) Polymers 0.000 title claims abstract description 21
- 239000004917 carbon fiber Substances 0.000 title claims abstract description 21
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 title claims abstract description 13
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 title claims abstract description 10
- 229910052799 carbon Inorganic materials 0.000 title claims abstract description 8
- 239000002131 composite material Substances 0.000 title claims description 14
- 239000011203 carbon fibre reinforced carbon Substances 0.000 title claims description 11
- 238000004519 manufacturing process Methods 0.000 title claims description 7
- 239000000463 material Substances 0.000 claims abstract description 15
- 239000012298 atmosphere Substances 0.000 claims abstract description 11
- 238000000034 method Methods 0.000 claims description 13
- 238000010304 firing Methods 0.000 claims description 11
- 230000001590 oxidative effect Effects 0.000 claims description 7
- 239000000126 substance Substances 0.000 claims description 7
- 238000000465 moulding Methods 0.000 claims description 2
- 239000005011 phenolic resin Substances 0.000 abstract description 6
- KXGFMDJXCMQABM-UHFFFAOYSA-N 2-methoxy-6-methylphenol Chemical compound [CH]OC1=CC=CC([CH])=C1O KXGFMDJXCMQABM-UHFFFAOYSA-N 0.000 abstract description 2
- 229920001568 phenolic resin Polymers 0.000 abstract description 2
- 239000010410 layer Substances 0.000 abstract 3
- 238000001354 calcination Methods 0.000 abstract 1
- 230000001747 exhibiting effect Effects 0.000 abstract 1
- 239000011229 interlayer Substances 0.000 abstract 1
- 238000004901 spalling Methods 0.000 abstract 1
- 239000000758 substrate Substances 0.000 abstract 1
- 239000011347 resin Substances 0.000 description 6
- 229920005989 resin Polymers 0.000 description 6
- 229920001187 thermosetting polymer Polymers 0.000 description 4
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 description 3
- 239000004744 fabric Substances 0.000 description 3
- -1 Furthermore Polymers 0.000 description 2
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- MWPLVEDNUUSJAV-UHFFFAOYSA-N anthracene Chemical compound C1=CC=CC2=CC3=CC=CC=C3C=C21 MWPLVEDNUUSJAV-UHFFFAOYSA-N 0.000 description 2
- 230000032798 delamination Effects 0.000 description 2
- 210000004709 eyebrow Anatomy 0.000 description 2
- 239000000835 fiber Substances 0.000 description 2
- 238000009730 filament winding Methods 0.000 description 2
- 239000007849 furan resin Substances 0.000 description 2
- 229910002804 graphite Inorganic materials 0.000 description 2
- 239000010439 graphite Substances 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 239000002759 woven fabric Substances 0.000 description 2
- 239000004743 Polypropylene Substances 0.000 description 1
- BZHJMEDXRYGGRV-UHFFFAOYSA-N Vinyl chloride Chemical compound ClC=C BZHJMEDXRYGGRV-UHFFFAOYSA-N 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000003763 carbonization Methods 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 230000008602 contraction Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 239000012299 nitrogen atmosphere Substances 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 229920013716 polyethylene resin Polymers 0.000 description 1
- 229920001155 polypropylene Polymers 0.000 description 1
- 229920003002 synthetic resin Polymers 0.000 description 1
- 239000000057 synthetic resin Substances 0.000 description 1
- 238000005979 thermal decomposition reaction Methods 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
Landscapes
- Ceramic Products (AREA)
Abstract
Description
【発明の詳細な説明】
（産業上の利用分野）
本発明は炭素繊維／炭素コンポジット（以下、Ｃ／Ｃコ
ンポジットという）製の筒体の製造方法に関する。DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a method for manufacturing a cylinder made of carbon fiber/carbon composite (hereinafter referred to as C/C composite).
（従来の技術）
たとえば、長尺なＣ／Ｃコンポジットの円筒は、一般に
次のようにして製造されている。すなわち、まず、所定
の長さと径を有するマンドレルに、炭素繊維と炭化可能
物質とのプリプレグを巻回して所定厚みの積層体を形成
する。(Prior Art) For example, a long C/C composite cylinder is generally manufactured as follows. That is, first, a prepreg of carbon fiber and carbonizable material is wound around a mandrel having a predetermined length and diameter to form a laminate having a predetermined thickness.
このとき、一般に、炭素繊維としては織物が用いられ、
また、炭化可能物質としてはフェノール樹脂やフラン樹
脂のような熱硬化性樹脂が用いられている。At this time, woven fabric is generally used as the carbon fiber,
Furthermore, thermosetting resins such as phenol resins and furan resins are used as carbonizable substances.
ついで、積層体を所定温度に加熱し、炭化可能物質を熱
硬化させて成型したのちマンドレルを引き抜く、その後
、得られた円筒をそのまま非酸化性雰囲気中にて焼成し
、炭化可能物質を炭化せしめることによりＣ／Ｃコンポ
ジットの円筒にする。Next, the laminate is heated to a predetermined temperature, the carbonizable material is thermosetted and molded, and the mandrel is pulled out.Then, the resulting cylinder is fired as it is in a non-oxidizing atmosphere to carbonize the carbonizable material. This makes it a C/C composite cylinder.
（発明が解決しようとする課題）
しかしながら、上記した従来の製造方法においては、次
のような不都合な問題が発生している。(Problems to be Solved by the Invention) However, in the conventional manufacturing method described above, the following inconvenient problems occur.
すなわち、その第１の問題は、円筒の断面を観察すると
眉間剥離や空隙が認められ、しかもこれら層間剥離や空
隙は円筒長手方向に延在しているという問題である。ま
た、第２の問題は、断面が真円にならず、歪んだ形状に
なりやすいという問題である。さらには、肉厚も不均一
で、しかも長手方向には反りが発生して円筒の直線性が
得にくいのである。That is, the first problem is that when the cross section of the cylinder is observed, glabellar peeling and voids are observed, and these delaminations and voids extend in the longitudinal direction of the cylinder. The second problem is that the cross section is not a perfect circle and tends to be distorted. Furthermore, the wall thickness is nonuniform, and warpage occurs in the longitudinal direction, making it difficult to obtain straightness of the cylinder.
本発明は、上記した問題を解決し、層間剥離や空隙がほ
とんどなく、円筒体の場合はその真円度が優れているよ
うに、横断面形状の変形がほとんどなく、また肉厚がよ
り均一で反りも少ないＣ／Ｃコンポジット製筒体の製造
方法の提供を目的とする。The present invention solves the above-mentioned problems, has almost no delamination or voids, has excellent roundness in the case of a cylindrical body, has almost no deformation in cross-sectional shape, and has a more uniform wall thickness. The purpose of the present invention is to provide a method for manufacturing a cylinder made of C/C composite with less warpage.
（課題を解決するための手段）
上記した目的を達成するために、本発明においては、マ
ンドルの周りに、厚みが５．０ ｍ以下で、炭素繊維の
体積含有率が５５〜７０％である、炭素繊維と炭化可能
物質とのプリプレグ層を形成する工程（以下、第１工程
という）；前記プリプレグ層を前記マンドレルごと熱処
理して成型する工程（以下、第２工程という）；成型体
を、前記マンドレルごと非酸化性雰囲気中にて６００〜
３０００℃で焼成する工程（以下、第３工程という）；
および、焼成体からマンドレルを抜き取る工程（以下、
第４工程という）；を含むことを特徴とする炭素繊維２
／炭素コンポジット製筒体の製造方法が提供される。(Means for Solving the Problems) In order to achieve the above object, in the present invention, the thickness is 5.0 m or less and the volume content of carbon fiber is 55 to 70% around the mandle. , a step of forming a prepreg layer of carbon fibers and a carbonizable substance (hereinafter referred to as the first step); a step of heat-treating and molding the prepreg layer together with the mandrel (hereinafter referred to as the second step); a molded body, 600~ in a non-oxidizing atmosphere with the mandrel
A step of firing at 3000°C (hereinafter referred to as the third step);
and the step of extracting the mandrel from the fired body (hereinafter referred to as
Carbon fiber 2 characterized in that it includes a fourth step);
/Provided is a method for manufacturing a carbon composite cylinder.
まず、第１工程で用いるマンドレルは、耐熱金属、黒鉛
、セラミックス等から成り、その横断面形状は、目的と
する筒体の横断面形状と相似関係にあり、通常、円形で
あるが、楕円状や多角形状等であってもよい。First, the mandrel used in the first step is made of heat-resistant metal, graphite, ceramics, etc., and its cross-sectional shape is similar to the cross-sectional shape of the target cylinder, and is usually circular, but elliptical. It may also be a polygonal shape or the like.
プリプレグは、炭素繊維と炭化可能物質とを複合して成
るものである。炭素繊維としては織物が好ましく使用さ
れる。具体的には、平織物、綾織物、朱子織物である。Prepreg is a composite of carbon fiber and carbonizable material. A woven fabric is preferably used as the carbon fiber. Specifically, they are plain weave, twill weave, and satin weave.
もっとも、本発明においては、炭素繊維を、連続繊維や
マット等の形態で用いることができる。また、炭化可能
物質は、フェノール樹脂やフラン樹脂等の熱硬化性樹脂
であることが好ましいが、石油重質油や、ピッチ、アン
トラセン等を使用することもできる。However, in the present invention, carbon fibers can be used in the form of continuous fibers, mats, or the like. Further, the carbonizable substance is preferably a thermosetting resin such as a phenol resin or a furan resin, but heavy petroleum oil, pitch, anthracene, etc. can also be used.
第１工程におけるプリプレグの形成は、通常、シート状
のプリプレグを用い、それを、マンドレルに巻回するこ
とによって行う。炭素繊維として連続繊維を用いる場合
には、フィラメントワインディング法によるか、または
、生の炭素繊維をフィラメントワインディング法と同様
にしてマンドレルに巻き付けたのち、炭化可能物質を含
浸する方法による。ここで、プリプレグ層の形成に当っ
ては、複合材料において通常採られているように、要求
特性等に応じて炭素繊維の方向を決める。たとえば、織
物プリプレグを用いる場合にあっては、織物の経糸また
は緯糸のいずれか一方がマンドレルの軸方向になる（し
たがって、他方の糸はマンドレルの周方向になる）よう
にする。Formation of the prepreg in the first step is usually performed by using a sheet-like prepreg and winding it around a mandrel. When continuous fibers are used as the carbon fibers, a filament winding method is used, or a method is used in which raw carbon fibers are wound around a mandrel in the same manner as the filament winding method and then impregnated with a carbonizable substance. Here, when forming the prepreg layer, the direction of the carbon fibers is determined depending on the required characteristics, etc., as is usually adopted for composite materials. For example, when using a fabric prepreg, either the warp or the weft of the fabric is oriented in the axial direction of the mandrel (therefore, the other yarn is in the circumferential direction of the mandrel).
なお、プリプレグ層の形成に先立ち、マンドレルの周面
に、非酸化性雰囲気中にて６００〜３０００″Ｃで焼成
したときの残炭率が５０％以下となるような物質から成
る下地層を形成しておくことが好ましい、この下地層は
、第３工程の焼成過程で、マンドレルと成型体との熱膨
張差により、とくにマンドレルと接する部分で炭素繊維
が切断することを抑制すると同時に、第４工程における
マンドレルの抜き取りを容易にしてマンドレルの再使用
を可能にするように作用する。In addition, prior to forming the prepreg layer, a base layer made of a material that has a residual carbon percentage of 50% or less when fired at 600 to 3000"C in a non-oxidizing atmosphere is formed on the circumferential surface of the mandrel. This base layer, which is preferably left in place, prevents the carbon fibers from being cut, especially at the portions in contact with the mandrel, due to the difference in thermal expansion between the mandrel and the molded body during the firing process of the third step, and at the same time, It functions to facilitate the removal of the mandrel during the process and to enable reuse of the mandrel.
このような下地層を形成する物質としては、たとえば、
パルプや、塩化ビニル樹脂、ポリエチレン樹脂、ポリプ
ロピレン樹脂等の合成樹脂があげられ、このような物質
をマンドレルに塗布したり、紙、フィルム等の形態でマ
ンドレルに巻回して下地層が形成される。この場合の下
地層の厚みは、薄すぎると上記した作用が発揮されず、
また、極端に厚いと、焼成時におけるマンドレルと成型
体との間隙が大きくなりすぎて、焼成過程における成型
体の変形が起りやすくなるので、０．２〜５ｍ程度であ
ることが好ましい。Examples of substances that form such a base layer include:
Examples include pulp and synthetic resins such as vinyl chloride resin, polyethylene resin, and polypropylene resin, and such materials are applied to a mandrel or wound around a mandrel in the form of paper, film, etc. to form the base layer. In this case, if the thickness of the base layer is too thin, the above-mentioned effect will not be exhibited.
Furthermore, if it is extremely thick, the gap between the mandrel and the molded body during firing becomes too large, making it easy for the molded body to deform during the firing process, so it is preferably about 0.2 to 5 m.
プリプレグは、その厚みが５．０ｆｆ１１１以下、炭素
繊維の体積含有率（Ｖｆ；％）が５５〜７０％に規制さ
れる。The thickness of the prepreg is limited to 5.0ff111 or less, and the volume content (Vf; %) of carbon fiber is limited to 55 to 70%.
プリプレグ層の厚みが５．０閣より厚いと、焼成過程で
炭化可能物質の熱分解時に発生するガスが外部に抜けき
れずに残留して空隙ができたり、また、炭化可能物質の
炭化過程における収縮により眉間剥離が多発するように
なる。If the thickness of the prepreg layer is thicker than 5.0 mm, the gas generated during the thermal decomposition of the carbonizable material during the firing process may not be able to escape to the outside and remain, creating voids. Contraction causes frequent glabellar peeling.
また、Ｖｆが５５％よりも低い場合は、焼成過程におい
て、炭化可能物質の収縮が大きく起り、その結果、横断
面では眉間剥離が多発するとともに、横断面形状の歪み
が発生しはじめる。Ｖｆが７０％よりも高い場合は、焼
成過程においては、逆に炭化可能物質の膨張が起り、同
じく眉間剥離や横断面の歪みを招く、このようなことか
ら、Ｖｆは上記範囲内に設定されるが、さらに好ましい
範囲は６０〜７０％である。If Vf is lower than 55%, the carbonizable material will shrink significantly during the firing process, and as a result, peeling between the eyebrows will occur frequently in the cross section, and distortion in the cross-sectional shape will begin to occur. If Vf is higher than 70%, expansion of the carbonizable material occurs during the firing process, which also causes peeling between the eyebrows and distortion of the cross section.For this reason, Vf is set within the above range. However, a more preferable range is 60 to 70%.
第２工程においては、第１工程で形成したプリプレグ層
を、マンドレルごと１５０〜２００℃程度の温度で熱処
理し、成型する。熱処理は、通常、常圧下で、数時間か
ら十数時間程度行う、炭化可能物質が熱硬化性樹脂であ
る場合、その熱硬化性樹脂はこの熱処理によって硬化す
る。In the second step, the prepreg layer formed in the first step is heat-treated together with the mandrel at a temperature of about 150 to 200° C. and molded. The heat treatment is usually carried out under normal pressure for several hours to about ten or more hours. When the carbonizable substance is a thermosetting resin, the thermosetting resin is cured by this heat treatment.
第３工程においては、第２工程で形成した成型体を、マ
ンドレルごと、非酸化性雰囲気中で焼成する。非酸化性
雰囲気としては、たとえば、窒素が好適である。焼成温
度は６００〜３０００ ”Ｃに設定される。６００℃よ
り低い温度では炭化可能物質の炭化が進行せず、また３
０００ ’Ｃより高い温度の設定は、工業的には無意
味である。In the third step, the molded body formed in the second step is fired together with the mandrel in a non-oxidizing atmosphere. For example, nitrogen is suitable as the non-oxidizing atmosphere. The firing temperature is set at 600-3000"C. At temperatures lower than 600"C, carbonization of the carbonizable material does not proceed;
Setting a temperature higher than 000'C is industrially meaningless.
この焼成により、成型体の炭化可能物質が炭化されて、
マンドレルの周囲に、焼成体、すなわちＣ／Ｃコンポジ
ットが形成される。By this firing, the carbonizable material of the molded body is carbonized,
A fired body, or C/C composite, is formed around the mandrel.
第４工程においては、第３工程で得られた焼成体からマ
ンドレルが抜き取られる。かくして、本発明のＣ／Ｃコ
ンポジット製筒体が得られる。In the fourth step, the mandrel is extracted from the fired body obtained in the third step. In this way, the C/C composite cylinder of the present invention is obtained.
（発明の実施例）
直径４０■、長さ３００ｍｍの棒状黒鉛から成るマンド
レルの周りに、０．０８５ａｍ厚の紙（残炭率＝２８重
量％）を厚みが０．３５＋＋ｍ＋となるように巻きつけ
て下地層を形成した。(Embodiment of the invention) A 0.085 am thick paper (remaining carbon content = 28% by weight) was wound around a mandrel made of rod-shaped graphite with a diameter of 40 mm and a length of 300 mm so that the thickness was 0.35 + m +. A base layer was formed.
ついで、この下地層の上に、東しく株）製炭素繊維“ト
レカ”の平織物Ｃｏ ６３４３（厚み： ０．２７閣
、日付：２００ｇ／ｎｆ）に、メタノールで各種濃度に
希釈したフェノール樹脂を含浸せしめて成るプリプレグ
を、表に示した厚みとなるように巻回してプリプレグ層
を形成し、さらに、２００℃で１０時間加熱してフェノ
ール樹脂を硬化し、マンドレル上に各種の成型体を形成
した。Next, on top of this base layer, phenol resin diluted with methanol to various concentrations was applied to carbon fiber "Toreca" plain fabric Co 6343 (thickness: 0.27 mm, date: 200 g/nf) manufactured by Toshiki Co., Ltd. The impregnated prepreg is wound to the thickness shown in the table to form a prepreg layer, and then heated at 200°C for 10 hours to harden the phenolic resin, forming various molded bodies on a mandrel. did.
ついで、下地層と成型体とをマンドレルごと雰囲気炉に
入れ、窒素雰囲気中にて１００℃／時の速度で１０００
’Ｃまで昇温し、その温度に６０分間保持して焼成し
た。Next, the base layer and the molded body were placed together with the mandrel in an atmosphere furnace, and heated at a rate of 100°C/hour in a nitrogen atmosphere for 1000°C.
The temperature was raised to 'C, and the temperature was maintained for 60 minutes for firing.
次に、焼成体から、マンドレルを手で押して抜き取り、
円筒のＣ／Ｃコンポジットを得た。このとき、抜き取り
は極めて容易であった。Next, push the mandrel by hand and pull it out from the fired body.
A cylindrical C/C composite was obtained. At this time, extraction was extremely easy.
得られた円筒を切断し、その横断面を目視観察して眉間
剥離や空隙の有無、真円度の良否、肉厚のばらつきを調
べた。その結果を一括して表に示した。The obtained cylinder was cut, and its cross section was visually observed to check for glabellar peeling and voids, roundness, and variation in wall thickness. The results are summarized in the table.
なお、比較のために、実施例においてフェノール樹脂を
硬化せしめた時点でマンドレルを抜き取り、得られた成
型体をそのまま、実施例と同じ条件で焼成した。得られ
たＣ／Ｃコンポジット円筒の断面状態も表に併記した。For comparison, the mandrel was removed at the time when the phenol resin was cured in the example, and the resulting molded body was fired as it was under the same conditions as in the example. The cross-sectional state of the obtained C/C composite cylinder is also listed in the table.
（以下余白） ＊ ： 断面最大値−断面量ノ」９直(Margin below) *: Maximum value of cross section - amount of cross section 9 shifts
Claims (2)
炭素繊維の体積含有率が５５〜７０％である、炭素繊維
と炭化可能物質とのプリプレグ層を形成する工程；前記
プリプレグ層を前記マンドレルごと熱処理して成型する
工程；成型体を前記マンドレルごと非酸化性雰囲気中に
て６００〜３０００℃で焼成する工程；および、焼成体
からマンドレルを抜き取る工程；を含むことを特徴とす
る炭素繊維／炭素コンポジット製筒体の製造方法。(1) Around the mandle, the thickness is 5.0 mm or less,
A step of forming a prepreg layer of carbon fibers and a carbonizable material in which the volume content of carbon fibers is 55 to 70%; A step of heat-treating and molding the prepreg layer together with the mandrel; A method for manufacturing a carbon fiber/carbon composite cylindrical body, comprising the steps of firing at 600 to 3000°C in an oxidizing atmosphere; and removing a mandrel from the fired body.
性雰囲気中にて６００〜３０００℃で焼成したときの残
炭率が５０重量％以下である物質から成る下地層を形成
する請求項１記載の製造方法。(2) A base layer made of a substance having a residual carbon content of 50% by weight or less when fired at 600 to 3000°C in a non-oxidizing atmosphere is formed in advance around the mandrel. Production method.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63267092A JPH02116672A (en) | 1988-10-25 | 1988-10-25 | Production of carbon fiber/carbon composite cylindrical body |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63267092A JPH02116672A (en) | 1988-10-25 | 1988-10-25 | Production of carbon fiber/carbon composite cylindrical body |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH02116672A true JPH02116672A (en) | 1990-05-01 |
Family
ID=17439937
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP63267092A Pending JPH02116672A (en) | 1988-10-25 | 1988-10-25 | Production of carbon fiber/carbon composite cylindrical body |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH02116672A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2013039696A (en) * | 2011-08-12 | 2013-02-28 | Ihi Aerospace Co Ltd | Method of manufacturing die and hot press with the die |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5035930A (en) * | 1973-07-12 | 1975-04-04 | ||
| JPS5734085A (en) * | 1980-08-06 | 1982-02-24 | Toho Beslon Co | Manufacture of carbon fiber reinforced carbon composite material |
-
1988
- 1988-10-25 JP JP63267092A patent/JPH02116672A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5035930A (en) * | 1973-07-12 | 1975-04-04 | ||
| JPS5734085A (en) * | 1980-08-06 | 1982-02-24 | Toho Beslon Co | Manufacture of carbon fiber reinforced carbon composite material |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2013039696A (en) * | 2011-08-12 | 2013-02-28 | Ihi Aerospace Co Ltd | Method of manufacturing die and hot press with the die |
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