JPH0726164B2 - Method for manufacturing SIC whiskey foam for FRM - Google Patents
Method for manufacturing SIC whiskey foam for FRMInfo
- Publication number
- JPH0726164B2 JPH0726164B2 JP60289432A JP28943285A JPH0726164B2 JP H0726164 B2 JPH0726164 B2 JP H0726164B2 JP 60289432 A JP60289432 A JP 60289432A JP 28943285 A JP28943285 A JP 28943285A JP H0726164 B2 JPH0726164 B2 JP H0726164B2
- Authority
- JP
- Japan
- Prior art keywords
- pressure
- preform
- molding
- frm
- sic
- 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
- 238000004519 manufacturing process Methods 0.000 title claims description 9
- 238000000034 method Methods 0.000 title description 9
- 239000006260 foam Substances 0.000 title 1
- 235000015041 whisky Nutrition 0.000 title 1
- 238000000465 moulding Methods 0.000 claims description 19
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 10
- 239000004925 Acrylic resin Substances 0.000 claims description 5
- 229920000178 Acrylic resin Polymers 0.000 claims description 5
- 239000002904 solvent Substances 0.000 claims description 3
- 238000001035 drying Methods 0.000 description 10
- 239000000835 fiber Substances 0.000 description 8
- 230000000694 effects Effects 0.000 description 4
- 239000011347 resin Substances 0.000 description 4
- 229920005989 resin Polymers 0.000 description 4
- 238000005336 cracking Methods 0.000 description 3
- 238000010438 heat treatment Methods 0.000 description 3
- 238000003825 pressing Methods 0.000 description 3
- 238000007796 conventional method Methods 0.000 description 2
- 239000013078 crystal Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000003960 organic solvent Substances 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 230000000717 retained effect Effects 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
Classifications
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H23/00—Processes or apparatus for adding material to the pulp or to the paper
Landscapes
- Paper (AREA)
- Manufacture Of Alloys Or Alloy Compounds (AREA)
Description
【発明の詳細な説明】 〔産業上の利用分野〕 本発明は、FRM用SiCウイスカプリフオームの製造方法に
関する。TECHNICAL FIELD The present invention relates to a method for producing a SiC whisker preform for FRM.
従来、SiCウイスカプリフオームの製造は、水または有
機溶媒等に分散させ、これを炉過成形あるいは加圧成形
した後、乾燥させる方法や、SiCウイスカを所定の圧力
で均等に圧搾後、炉過成形し、所定の繊維含有量のプリ
フオームを得る方法等が実施されている。Conventionally, SiC whisker preforms have been manufactured by dispersing them in water or an organic solvent and then subjecting them to furnace overmolding or pressure molding and then drying, or after uniformly compressing the SiC whiskers at a specified pressure, Methods such as molding to obtain a preform having a predetermined fiber content are practiced.
従来のSiCウイスカプリフオームの製造法では、乾燥時
にプリフオームに割れが発生したり、高繊維含有量のプ
リフオームになると、成形時に割れが入り、乾燥すると
ころの割れが著しく大きくなく傾向がある。In the conventional method for producing a SiC whisker preform, cracks are generated in the preform during drying, and when a preform having a high fiber content is formed, cracks are formed during molding and the cracks in the dried part tend not to be significantly large.
又、成形前にSiCウイスカを所定の圧力で圧搾して炉過
成形する方法では、圧搾の際にSiCウイスカが損傷し、
長さが短かくなることが考えられる。長さが短かくなる
と、アスペクト比が小さくなり、FRM化したときの強度
の向上が余り期待できない。Also, in the method of pressing the SiC whiskers at a predetermined pressure before molding and furnace overmolding, the SiC whiskers are damaged during pressing,
It is possible that the length becomes shorter. As the length becomes shorter, the aspect ratio becomes smaller, and improvement in strength when FRM is applied cannot be expected very much.
本発明は、SiCウイスカプリフオームを損傷せずに、か
つ成形乾燥時のプリフオームの割れ等を解決する方法を
提案せんとするものである。The present invention proposes a method for solving cracks in the preform during molding and drying without damaging the SiC whisker preform.
本発明は、前記問題点を溶媒を水とし、これに成形助剤
として親水基をもつアクリル系樹脂を添加し、さらに成
型方法を工夫することにより解決するものである。The present invention solves the above problems by using water as a solvent, adding an acrylic resin having a hydrophilic group as a molding aid thereto, and devising a molding method.
すなわち本発明は、SiCウイスカに溶媒として水を用
い、成形助剤として親水基をもつアクリル系樹脂を添加
し、水中分散させ、所定の形状の成形型で加圧成形し、
加圧力を解除後、低圧で再加圧し、加圧保持のまま成形
型ごと加熱することを特徴とするFRM用SiCウイスカプリ
フオームの製造方法である。That is, the present invention, using water as a solvent in the SiC whiskers, adding an acrylic resin having a hydrophilic group as a molding aid, dispersed in water, pressure molding in a mold of a predetermined shape,
A method of manufacturing a SiC whisker preform for FRM, which comprises repressurizing at a low pressure after releasing the applied pressure, and heating the mold together with maintaining the pressure.
原料となる、SiCウイスカは繊維径0.1〜1.0μｍ、長さ1
00〜300μｍのβ−SiC針状単結晶である。これを水中分
散させ、親水基をもつアクリル系樹脂を添加する。樹脂
の添加量は、SiCウイスカに対して2wt％〜10wt％が良好
で、ウイスカプリフオームにおける繊維体積含有量（Vf
値）が高いほど、この樹脂の添加量を多くする。樹脂量
が少なすぎると、成形助剤としての効果が顕著でない。The raw material, SiC whiskers, has a fiber diameter of 0.1 to 1.0 μm and a length of 1
It is a β-SiC acicular single crystal of 00 to 300 μm. This is dispersed in water, and an acrylic resin having a hydrophilic group is added. The amount of resin added is preferably 2 wt% to 10 wt% with respect to the SiC whiskers, and the fiber volume content (V f
The higher the value), the greater the amount of this resin added. If the amount of resin is too small, the effect as a molding aid is not remarkable.
次に、上記の水中分散させ樹脂を添加したSiCウイスカ
を、所定の成形型に入れ、加圧成形する。この際、プリ
フオームが目的のVf値に達するまで加圧したら、そのま
まの状態で10min〜20min加圧保持する。加圧保持しない
で、加圧力を解除すると、バツクラツシユによりプリフ
オームに割れを生じる。Next, the above SiC whiskers dispersed in water and added with a resin are put into a predetermined molding die and pressure-molded. At this time, after pressurizing the preform until the target V f value is reached, the preform is pressurized and held as it is for 10 min to 20 min. If the applied pressure is released without holding the pressure, the preform will crack due to backlash.
また、加圧力を解除した後、再び低圧（10kg/cm2以下）
で加圧すると、割れの発生はほとんどない。Also, after releasing the pressure, low pressure (10 kg / cm 2 or less) again.
Almost no cracking occurs when the pressure is applied at.
このような成形方法においては、加圧成形時、又はプリ
フオーム乾燥時に非常に割れを生じやすく、特に高Vf値
の場合はその傾向が大きいが、加圧成形後、加圧力を解
除し、再び低圧（10kg/cm2〜20kg/cm2）で加圧し、加圧
保持したまま成形型ごと加熱（乾燥）させることによっ
て、高Vf値、例えばVf値20〜40％のプリフオームであっ
ても割れを生じることなく成形することができる。乾燥
は成形型から取出し後に行つてもよい。In such a molding method, during the pressure molding or during the preform drying, cracks are apt to occur, and particularly in the case of a high V f value, the tendency is large, but after the pressure molding, the pressing force is released and the pressurized at low pressure (10kg / cm 2 ~20kg / cm 2), by pressure retained while the mold by heating (drying), high V f value, a preform of example V f value 20-40% Can be molded without cracking. Drying may be performed after removing from the mold.
第１図に、本発明方法の一実施態様のフローを示す。図
中、直線のフローは参考例であり、Vf値20％以下のプリ
フオームの製造に適用できるが、点線で示す本発明方法
のフローはVf値20％以上の高繊維含有量プリフオームの
製造にも適用することができる。FIG. 1 shows a flow of one embodiment of the method of the present invention. In the figure, the straight line flow is a reference example, and can be applied to the production of preforms having a V f value of 20% or less, but the flow of the method of the present invention shown by the dotted line is the production of a high fiber content preform having a V f value of 20% or more. Can also be applied to.
実施例１ 繊維メーカーから購入後、精製したSiCウイスカ40gを水
中分散し、これにアクリル系樹脂（商品名：リカボン
ド）をSiCウイスカに対して7wt％添加した。これを回転
式（スクリユー）攪拌機で10分間攪拌した後、内径φ30
mm、高さ150mmのステンレス製金型により成形圧力200kg
/cm2で上下２方向から加圧し、そのまま10分間保持し
た。Example 1 After purchasing from a fiber maker, 40 g of purified SiC whiskers were dispersed in water, and an acrylic resin (trade name: Ricabond) was added to this in an amount of 7 wt% with respect to the SiC whiskers. After stirring this for 10 minutes with a rotary (screw) stirrer, the inner diameter φ30
mm, height 150 mm, stainless steel mold, molding pressure 200 kg
The pressure was applied from the upper and lower sides in the direction of / cm 2 , and the pressure was maintained for 10 minutes.
加圧力を解除後、再度、10kg/cm2の低圧で加圧したま
ま、リボンヒーターで金型ごと加熱した。加熱温度は20
0℃で時間は20分間保持した。その後、金型からプリフ
オームを取り出した。After the pressure was released, the mold was again heated with a ribbon heater while being pressurized at a low pressure of 10 kg / cm 2 . The heating temperature is 20
Hold at 0 ° C for 20 minutes. Then, the preform was taken out from the mold.
残りの水分量は、SiCウイスカに対して25％程度であつ
た。これを乾燥炉に入れ、乾燥温度60℃で完全に乾燥さ
せ、直径φ30mm、高さ60mm、Vf＝30％のSiCウイスカプ
リフオームを得た。The remaining water content was about 25% with respect to the SiC whiskers. This was put in a drying oven and completely dried at a drying temperature of 60 ° C. to obtain a SiC whisper preform having a diameter of 30 mm, a height of 60 mm and V f = 30%.
本発明によるSiCウイスカプリフオーム製造法を用いる
と、以下の効果を奏することができる。The following effects can be obtained by using the SiC whisker preform manufacturing method according to the present invention.
１）従来の製造方法と比較して、成形助剤の効果によ
り、プリフオーム成形時及び乾燥時の割れ等が防止でき
る。1) Compared with the conventional manufacturing method, the effect of the molding aid can prevent cracks during preform molding and during drying.
２）特に、Vf値が20％〜40％の高繊維含有量プリフオー
ム製造に関しては、従来の方法では、成形、乾燥時の割
れがひどく、成形困難であつたが、本発明方法を用いる
と、この問題は大巾に改善され、高繊維含有量プリフオ
ームの製造を容易に行うことができる。2) In particular, regarding the production of a high fiber content preform having a V f value of 20% to 40%, the conventional method had severe cracking during molding and drying, which made it difficult to mold. However, this problem is greatly improved, and a high fiber content preform can be easily manufactured.
第１図は本発明方法の一実施態様例のフローを示す図で
ある。FIG. 1 is a diagram showing a flow of an embodiment of the method of the present invention.
Claims (1)
助剤として親水基をもつアクリル系樹脂を添加し、水中
分散させ、所定の形状の成形型で、加圧成形し、加圧力
を解除後、低圧で再加圧し、加圧保持のまま成形型ごと
加熱することを特徴とするFRM用SiCウイスカプリフオー
ムの製造方法。1. A water is used as a solvent for a SiC whisker, an acrylic resin having a hydrophilic group is added as a molding aid, dispersed in water, and pressure-molded with a mold having a predetermined shape to release the pressure. Then, the method for producing a SiC whisker preform for FRM is characterized in that it is repressurized at a low pressure and then the mold together with the pressure is heated.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP60289432A JPH0726164B2 (en) | 1985-12-24 | 1985-12-24 | Method for manufacturing SIC whiskey foam for FRM |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP60289432A JPH0726164B2 (en) | 1985-12-24 | 1985-12-24 | Method for manufacturing SIC whiskey foam for FRM |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS62149832A JPS62149832A (en) | 1987-07-03 |
| JPH0726164B2 true JPH0726164B2 (en) | 1995-03-22 |
Family
ID=17743168
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP60289432A Expired - Lifetime JPH0726164B2 (en) | 1985-12-24 | 1985-12-24 | Method for manufacturing SIC whiskey foam for FRM |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0726164B2 (en) |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS59121197A (en) * | 1982-12-25 | 1984-07-13 | Tokai Carbon Co Ltd | Preparation of whisker preform for composite material |
-
1985
- 1985-12-24 JP JP60289432A patent/JPH0726164B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPS62149832A (en) | 1987-07-03 |
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