JPH0465357A - Method for reducing porosity of fiber reinforced composite material - Google Patents
Method for reducing porosity of fiber reinforced composite materialInfo
- Publication number
- JPH0465357A JPH0465357A JP2178284A JP17828490A JPH0465357A JP H0465357 A JPH0465357 A JP H0465357A JP 2178284 A JP2178284 A JP 2178284A JP 17828490 A JP17828490 A JP 17828490A JP H0465357 A JPH0465357 A JP H0465357A
- Authority
- JP
- Japan
- Prior art keywords
- fiber
- composite material
- reinforced composite
- porosity
- reducing
- 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
- 239000000463 material Substances 0.000 title claims description 40
- 239000003733 fiber-reinforced composite Substances 0.000 title claims description 36
- 238000000034 method Methods 0.000 title claims description 31
- 239000011148 porous material Substances 0.000 claims description 20
- 239000011159 matrix material Substances 0.000 claims description 17
- 229910052799 carbon Inorganic materials 0.000 claims description 14
- 239000007789 gas Substances 0.000 claims description 14
- 239000012495 reaction gas Substances 0.000 claims description 7
- 239000000835 fiber Substances 0.000 claims description 6
- 239000007795 chemical reaction product Substances 0.000 claims description 5
- 239000002657 fibrous material Substances 0.000 claims description 2
- 239000010419 fine particle Substances 0.000 claims description 2
- 239000004745 nonwoven fabric Substances 0.000 claims description 2
- 239000002759 woven fabric Substances 0.000 claims description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 12
- 239000002131 composite material Substances 0.000 description 7
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 6
- 230000002093 peripheral effect Effects 0.000 description 6
- 229920000049 Carbon (fiber) Polymers 0.000 description 5
- 239000004917 carbon fiber Substances 0.000 description 5
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 5
- 239000007788 liquid Substances 0.000 description 4
- 239000007791 liquid phase Substances 0.000 description 3
- 229910052757 nitrogen Inorganic materials 0.000 description 3
- 239000012071 phase Substances 0.000 description 3
- QQONPFPTGQHPMA-UHFFFAOYSA-N propylene Natural products CC=C QQONPFPTGQHPMA-UHFFFAOYSA-N 0.000 description 3
- 125000004805 propylene group Chemical group [H]C([H])([H])C([H])([*:1])C([H])([H])[*:2] 0.000 description 3
- 238000003763 carbonization Methods 0.000 description 2
- 230000000052 comparative effect Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000005470 impregnation Methods 0.000 description 2
- 238000005229 chemical vapour deposition Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000009730 filament winding Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 230000008595 infiltration Effects 0.000 description 1
- 238000001764 infiltration Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 239000000376 reactant Substances 0.000 description 1
- 230000035484 reaction time Effects 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
Landscapes
- Ceramic Products (AREA)
- Carbon And Carbon Compounds (AREA)
Abstract
(57)【要約】本公報は電子出願前の出願データであるた
め要約のデータは記録されません。(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.
Description
【発明の詳細な説明】
［産業上の利用分野］
この発明は、繊維強化複合材料の製造方法に関するもの
であり、特に、繊維強化複合材料の気孔率を低下させる
方法に関するものである。DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a method for producing a fiber-reinforced composite material, and particularly to a method for reducing the porosity of a fiber-reinforced composite material.
［従来の技術］
高気孔率の繊維強化複合材料の気孔に、マトリックスを
充填することにより、低気孔率化している。気孔内への
マトリックスの充填は、液相て行なう場合と、気相で行
なう場合とがある。液相でマトリックスを充填する方法
としては、樹脂含浸法、加圧含浸炭化法（たとえば、「
炭素繊維産業」著者 森田健−近代編集社のｐ１７６〜
１７８に開示されている）等がある。[Prior Art] The porosity of a high-porosity fiber-reinforced composite material is reduced by filling the pores with a matrix. The filling of the matrix into the pores may be carried out in a liquid phase or in a gas phase. Methods for filling the matrix with liquid phase include resin impregnation method, pressure impregnation carbonization method (for example,
"Carbon Fiber Industry" Author: Ken Morita - Kindai Editorial Co., Ltd. p176~
178), etc.
気相でマトリックスを充填する方法としては、ＣＶＤ法
（たとえば、「炭素繊維産業」 著者森田健−近代編集
社のｐ１７６〜１７８に開示されている）、ＣＶＩ法（
たとえば、Ａｍ、Ｃｅｒａｍ、 Ｓｏｃ、 Ｂｕ
ｌ １．、 ６５ ［２コ ３４７−５０ （１
９８６）に開示されている）がある。Methods for filling the matrix with a gas phase include the CVD method (for example, disclosed in "Carbon Fiber Industry" by Ken Morita, published by Kindai Editorial Co., Ltd., pages 176-178), the CVI method (
For example, Am, Ceram, Soc, Bu
l 1. , 65 [2 pieces 347-50 (1
986)).
液相でマトリックスを気孔に充填する場合、繊維強化複
合材料の表面から内部に向かうにしたがって液体が浸透
しにくくなるので、繊維強化複合材料の内部では低気孔
率化を達成することができない。繊維強化複合材料の内
部にまで、液体を浸透させるために低粘度の液体を用い
ることも考えられる。例えば、液体としてピッチを用い
た場合、低粘度のピッチは炭化収率か悪く、−度の浸透
では、低気孔率を達成することかできない。When filling the pores with a matrix in a liquid phase, it becomes difficult for the liquid to penetrate from the surface of the fiber-reinforced composite material toward the inside, so it is impossible to achieve low porosity inside the fiber-reinforced composite material. It is also conceivable to use a low-viscosity liquid in order to allow the liquid to penetrate into the interior of the fiber-reinforced composite material. For example, when pitch is used as the liquid, pitch with low viscosity has a poor carbonization yield, and low porosity cannot be achieved with a low degree of penetration.
気相で気孔にマトリックスを充填する方法では、通常、
反応ガス同士か反応することにより生成される反応生成
ガスは、反応ガスよりも体積か大きくなる。このため、
繊維強化複合材料の内部に浸入する反応ガスよりも、内
部から外に向かって噴８してくる反応生成ガスの量の方
か多い。したがって、反応ガスは繊維強化複合材料の内
部まで浸入することか困難となり、繊維強化複合材料の
内部では、低気孔率化を達成することかできない。The method of filling the pores with a matrix in the gas phase usually involves
The reaction product gas produced by reacting the reaction gases with each other has a volume larger than that of the reaction gas. For this reason,
The amount of reaction product gas that blows out from the inside of the fiber-reinforced composite material is greater than the amount of reaction gas that enters the inside of the fiber-reinforced composite material. Therefore, it becomes difficult for the reaction gas to penetrate into the interior of the fiber-reinforced composite material, and it is impossible to achieve a low porosity inside the fiber-reinforced composite material.
また、気孔の幅より気孔の深さのほうか大きいので、気
孔の内部かマトリックスで充填される前に、気孔の入り
口かマトリックスで塞がれてしまう。In addition, since the depth of the pore is larger than the width of the pore, the entrance of the pore is blocked by the matrix before the inside of the pore is filled with the matrix.
１発明か解決しようとする課題］
気相状態で気孔をマトリックスで充填する場合、繊維強
化複合材料の内部にまで反応ガスを浸入させることかで
きる方法として、圧力勾配法（たとえば、Ｗ、Ｖ、Ｋｏ
ｔ １ｅｎｓｋｙ、 “Ｃｈ ｅｍｉｓｔｒｙ ａ
ｎｄ Ｐｈｙｓｉｃｓ ｏｆ Ｃａｒｂｏｎ
Ｖｏｌ、９”ｅｄｔ、 ｂｙ Ｐ。1 Invention or Problems to be Solved] When filling pores with a matrix in a gaseous state, pressure gradient method (for example, W, V, Ko
t1ensky, “Ch emistry a
nd Physics of Carbon
Vol, 9” edt, by P.
Ｌ、Ｗａｌｋｅｒ、Ｊｒ、 ｅｔ ａｌ、、ｐｐ
１７４−２６２ （＋９７３） 、 に開示されている
。）がある。圧力勾配法は、繊維強化複合材料の一方の
表面と他方の表面とに圧力差を設けることにより、繊維
強化複合材料内部に反応ガスが浸入しやすいようにする
。L., Walker, Jr., et al., pp.
174-262 (+973), . ). In the pressure gradient method, a pressure difference is provided between one surface and the other surface of the fiber-reinforced composite material to facilitate the infiltration of the reaction gas into the fiber-reinforced composite material.
気孔の内部かマトリックスで充填される前に、気孔の入
り口がマトリックスで埋まるという問題を解決する技術
として、本願出願人と同−出願人がした特願平１−１３
９８４６号がある。As a technique for solving the problem that the entrance of a pore is filled with a matrix before the inside of the pore is filled with a matrix, Japanese Patent Application No. 1-13 filed by the applicant and the same applicant
There is No. 9846.
しかしながら、圧力勾配法、特願平１−１３９８４６号
に開示された技術だけでは、繊維強化複合材料の十分な
低気孔率化を図ることかできなかった。However, it has not been possible to sufficiently reduce the porosity of fiber-reinforced composite materials using only the pressure gradient method and the technique disclosed in Japanese Patent Application No. 1-139846.
この発明はこのような従来の問題点を解決するためにな
されたものである。この発明の目的は、繊維強化複合材
料の十分な低気孔率化を図ることかできる方法を提供す
ることである。This invention was made to solve these conventional problems. An object of the present invention is to provide a method that can sufficiently reduce the porosity of a fiber-reinforced composite material.
［課題を解決するための手段］
繊維強化複合材料の低気孔率化方法は、第１および第２
の表面を備え、かつ、気孔を有する繊維強化複合材料の
気孔内に、反応ガスを導入し、反応ガスから生成された
反応生成物を化学蒸着させるものである。[Means for solving the problem] The method for lowering the porosity of fiber-reinforced composite materials includes the first and second methods.
A reactive gas is introduced into the pores of a fiber-reinforced composite material having a surface and pores, and a reaction product generated from the reactive gas is chemically vapor deposited.
この発明にしたがった繊維強化複合材料の低気孔率化方
法は、微粒子か連続的に流れることにより形成される流
動層を、第１の表面と接するように設け、第１の表面側
の圧力を、第２の表面側の圧力より高くし、反応ガスを
流動層を通して、第１の表面に導いたことを特徴とする
。The method for reducing the porosity of a fiber-reinforced composite material according to the present invention is to provide a fluidized bed formed by continuous flow of fine particles in contact with a first surface, and to reduce the pressure on the first surface side. , the pressure is higher than that on the second surface side, and the reaction gas is guided to the first surface through a fluidized bed.
繊維強化複合材料の繊維としては、ウィスカー短繊維、
ペーパー、フェルト、長繊維、不織布、２次元織布およ
びｎＤ材（ｎ≧３）を含む群から選ばれた少なくとも１
種以上かある。The fibers of fiber-reinforced composite materials include whisker short fibers,
At least one selected from the group including paper, felt, long fiber, nonwoven fabric, two-dimensional woven fabric, and nD material (n≧3)
There are more than seeds.
繊維強化複合材料の繊維の材料としては、Ｃ１Ｓ ＩＣ
−、Ｓ ｉ３ Ｎ４、ＢＪ ＣおよびＢＮを含む群から
選ばれた少なくとも１種以上がある。The fiber material for fiber reinforced composite material is C1S IC.
-, S i3 N4, BJ C and BN.
繊維強化複合材料のマトリックスの材料としては、Ｃ，
ＳｉＣ，５ｊ３Ｎ、、、Ｂ、ＣおよびＢＮを含む群から
選ばれた少なくとも１種以上かある。The matrix material of the fiber reinforced composite material is C,
There is at least one kind selected from the group including SiC, 5j3N, . . . B, C, and BN.
［作用・効果］
この発明にしたかった繊維強化複合材料の低気孔率化方
法は、圧力勾配法と特願平１−１３９８４６号に開示さ
れた技術とを組み合わせたものである。[Operations and Effects] The method of reducing the porosity of fiber-reinforced composite materials, which is the object of the present invention, is a combination of the pressure gradient method and the technique disclosed in Japanese Patent Application No. 1-139846.
特願平１−１３９８４６号に開示された技術の作用を、
簡単に説明する。この技術は、繊維強化複合材料の一方
の表面を流動層と接するようにしている。流動層は、微
粒子を連続的に流すことにより形成される。そして、反
応ガスを流動層を通して繊維強化複合材料の一方の表面
に導く。気孔の入り口は絶えず粒子と衝突しているので
、気孔の入り口にマトリックスが形成されてもマトリッ
クスは剥がされることになる。したかつて、気孔の内部
にまでマトリックスを充填することが可能となる。The effect of the technology disclosed in Japanese Patent Application No. 1-139846,
Explain briefly. This technique brings one surface of the fiber-reinforced composite material into contact with a fluidized bed. A fluidized bed is formed by continuously flowing particulates. The reactant gas is then introduced to one surface of the fiber-reinforced composite material through the fluidized bed. Since the pore entrances are constantly collided with particles, even if a matrix is formed at the pore entrances, the matrix will be peeled off. Once this is done, it becomes possible to fill the matrix even inside the pores.
この発明にしたかった繊維強化複合材料の低気孔率化方
法は、上記２つの技術を組み合わせたので、繊維強化複
合材料を十分に低気孔率化することか可能となる。The method of reducing the porosity of a fiber-reinforced composite material, which is the object of the present invention, combines the above two techniques, so that it is possible to sufficiently reduce the porosity of the fiber-reinforced composite material.
［実施例］
この発明の一実施例を用いて炭素繊維強化炭素複合材料
の低気孔率化を行なった。[Example] An example of the present invention was used to reduce the porosity of a carbon fiber-reinforced carbon composite material.
まず、フィラメント・ワインディング法で炭素繊維強化
炭素複合材料の円筒を制作した。円筒の高さは、１０ｃ
ｍ、外径は５ｃｍ、内径は３．５ｃｍであった。気孔率
は３０％であった。反応ガスに用いるプロピレンと窒素
との混合ガスは、大気圧下で、基材円筒の外周面から内
周面まで通じた。First, a cylinder made of carbon fiber-reinforced carbon composite material was created using the filament winding method. The height of the cylinder is 10c
m, the outer diameter was 5 cm, and the inner diameter was 3.5 cm. The porosity was 30%. A mixed gas of propylene and nitrogen used as a reaction gas was passed from the outer peripheral surface of the base cylinder to the inner peripheral surface under atmospheric pressure.
ガスで８１０２粉末（直径約３００ａｍ）を動かし、円
筒の内周面で囲まれた領域を流動層とした。基材を高周
波加熱により９００℃に加熱した。8102 powder (about 300 am in diameter) was moved using gas, and the area surrounded by the inner peripheral surface of the cylinder was made into a fluidized bed. The substrate was heated to 900°C by high frequency heating.
円筒の外周面側を、０．４気圧に減圧した。円筒の内周
面側は、大気圧の状態にある。The pressure on the outer peripheral surface of the cylinder was reduced to 0.4 atm. The inner peripheral surface of the cylinder is at atmospheric pressure.
プロピレンと窒素とからなる混合ガス（プロピレン：窒
素−１：４（体積比））を用い、ＣＶＩ法によって、基
材の気孔にマトリックスを充填した。反応時間は５０時
間であった。得られた炭素繊維強化炭素複合材料の気孔
率は、９％であった。Using a mixed gas of propylene and nitrogen (propylene:nitrogen - 1:4 (volume ratio)), the pores of the base material were filled with the matrix by the CVI method. The reaction time was 50 hours. The porosity of the obtained carbon fiber reinforced carbon composite material was 9%.
比較例１として、円筒の外周面側を大気圧にした以外は
、すへてこの発明の一実施例と同し条件にして、炭素繊
維強化炭素複合材料の低気孔率化を図った。得られた炭
素繊維強化炭素複合材料の気孔率は、１５％であった。As Comparative Example 1, a carbon fiber-reinforced carbon composite material was made to have a low porosity under the same conditions as in an example of the present invention, except that the outer circumferential surface of the cylinder was brought to atmospheric pressure. The porosity of the obtained carbon fiber reinforced carbon composite material was 15%.
比較例２として、流動層を形成しない以外は、すべてこ
の発明の一実施例と同じ条件にして炭素繊維強化炭素複
合材料の低気孔率化を図った。円筒の内周面には、多量
の反応生成物が付着し、気孔の入り口が目詰まりをして
いた。得られた炭素繊維強化炭素複合材料の気孔率は、
１７％であった。As Comparative Example 2, a carbon fiber-reinforced carbon composite material was made to have a low porosity under all the same conditions as in Example of the present invention except that no fluidized bed was formed. A large amount of reaction products adhered to the inner peripheral surface of the cylinder, and the entrances of the pores were clogged. The porosity of the obtained carbon fiber reinforced carbon composite material is
It was 17%.
したがって、この発明にしたがった繊維強化複合材料の
低気孔率化方法によれば、気孔率をさらに低下させるこ
とができる。Therefore, according to the method for reducing the porosity of a fiber-reinforced composite material according to the present invention, the porosity can be further reduced.
Claims (4)
る繊維強化複合材料の前記気孔内に、反応ガスを導入し
、前記反応ガスから生成された反応生成物を化学蒸着さ
せ、前記繊維強化複合材料を低気孔率化する方法におい
て、 微粒子が連続的に流れることにより形成される流動層を
、前記第１の表面と接するように設け、前記第１の表面
側の圧力を、前記第２の表面側の圧力より高くし、前記
反応ガスを前記流動層を通して、前記第１の表面に導い
たことを特徴とする、繊維強化複合材料の低気孔率化方
法。(1) A reactive gas is introduced into the pores of the fiber-reinforced composite material having first and second surfaces and has pores, and a reaction product generated from the reactive gas is chemically vapor deposited; In a method for reducing the porosity of a fiber-reinforced composite material, a fluidized bed formed by continuous flow of fine particles is provided in contact with the first surface, and the pressure on the first surface side is adjusted to A method for reducing the porosity of a fiber-reinforced composite material, characterized in that the pressure is higher than that on the second surface side, and the reaction gas is guided to the first surface through the fluidized bed.
繊維、ペーパー、フェルト、長繊維、不織布、２次元織
布およびｎＤ材（ｎ≧３）を含む群から選ばれた少なく
とも１種以上である、請求項１に記載の繊維強化複合材
料の低気孔率化方法。(2) The fibers of the fiber-reinforced composite material are at least one type selected from the group including whiskers, short fibers, paper, felt, long fibers, nonwoven fabrics, two-dimensional woven fabrics, and nD materials (n≧3). A method for reducing the porosity of a fiber-reinforced composite material according to claim 1.
Ｃ、Ｓｉ＿３Ｎ＿４、Ｂ＿４ＣおよびＢＮを含む群から
選ばれた少なくとも１種以上である、請求項１に記載の
繊維強化複合材料の低気孔率化方法。(3) The fiber material of the fiber reinforced composite material is C, Si
The method for lowering the porosity of a fiber-reinforced composite material according to claim 1, wherein the porosity is at least one selected from the group including C, Si_3N_4, B_4C, and BN.
Ｃ、ＳｉＣ、Ｓｉ＿３、Ｎ＿４、Ｂ＿、ＣおよびＢＮを
含む群から選ばれた少なくとも１種以上である、請求項
１に記載の繊維強化複合材料の低気孔率化方法。(4) The material of the matrix of the fiber reinforced composite material is:
The method for lowering the porosity of a fiber-reinforced composite material according to claim 1, wherein the porosity is at least one selected from the group including C, SiC, Si_3, N_4, B_, C, and BN.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2178284A JPH0465357A (en) | 1990-07-04 | 1990-07-04 | Method for reducing porosity of fiber reinforced composite material |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2178284A JPH0465357A (en) | 1990-07-04 | 1990-07-04 | Method for reducing porosity of fiber reinforced composite material |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0465357A true JPH0465357A (en) | 1992-03-02 |
Family
ID=16045780
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2178284A Pending JPH0465357A (en) | 1990-07-04 | 1990-07-04 | Method for reducing porosity of fiber reinforced composite material |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0465357A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN119841655A (en) * | 2025-01-15 | 2025-04-18 | 烟台大学 | Gradient boron carbide composite material with double-layer structure and preparation method and application thereof |
-
1990
- 1990-07-04 JP JP2178284A patent/JPH0465357A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN119841655A (en) * | 2025-01-15 | 2025-04-18 | 烟台大学 | Gradient boron carbide composite material with double-layer structure and preparation method and application thereof |
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