JPH0523563B2 - - Google Patents
Info
- Publication number
- JPH0523563B2 JPH0523563B2 JP31803987A JP31803987A JPH0523563B2 JP H0523563 B2 JPH0523563 B2 JP H0523563B2 JP 31803987 A JP31803987 A JP 31803987A JP 31803987 A JP31803987 A JP 31803987A JP H0523563 B2 JPH0523563 B2 JP H0523563B2
- Authority
- JP
- Japan
- Prior art keywords
- composite
- carbon mold
- carbon
- mold
- cylindrical
- 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
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 71
- 229910052799 carbon Inorganic materials 0.000 claims description 56
- 239000002131 composite material Substances 0.000 claims description 41
- 229910002804 graphite Inorganic materials 0.000 description 15
- 239000010439 graphite Substances 0.000 description 15
- 238000010438 heat treatment Methods 0.000 description 9
- 238000001816 cooling Methods 0.000 description 6
- 239000000463 material Substances 0.000 description 5
- 229920000049 Carbon (fiber) Polymers 0.000 description 4
- 239000004917 carbon fiber Substances 0.000 description 4
- 238000007731 hot pressing Methods 0.000 description 4
- 239000005011 phenolic resin Substances 0.000 description 4
- 229920001568 phenolic resin Polymers 0.000 description 4
- 230000003014 reinforcing effect Effects 0.000 description 4
- 230000000052 comparative effect Effects 0.000 description 3
- 239000000843 powder Substances 0.000 description 3
- 229920005989 resin Polymers 0.000 description 3
- 239000011347 resin Substances 0.000 description 3
- KXGFMDJXCMQABM-UHFFFAOYSA-N 2-methoxy-6-methylphenol Chemical compound [CH]OC1=CC=CC([CH])=C1O KXGFMDJXCMQABM-UHFFFAOYSA-N 0.000 description 2
- 229910052581 Si3N4 Inorganic materials 0.000 description 2
- 238000003763 carbonization Methods 0.000 description 2
- 239000000919 ceramic Substances 0.000 description 2
- 208000037998 chronic venous disease Diseases 0.000 description 2
- 238000005336 cracking Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000010304 firing Methods 0.000 description 2
- 238000005470 impregnation Methods 0.000 description 2
- 239000011810 insulating material Substances 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 150000002739 metals Chemical class 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 239000002296 pyrolytic carbon Substances 0.000 description 2
- HQVNEWCFYHHQES-UHFFFAOYSA-N silicon nitride Chemical compound N12[Si]34N5[Si]62N3[Si]51N64 HQVNEWCFYHHQES-UHFFFAOYSA-N 0.000 description 2
- 238000005245 sintering Methods 0.000 description 2
- 125000006850 spacer group Chemical group 0.000 description 2
- 229920000297 Rayon Polymers 0.000 description 1
- 238000010000 carbonizing Methods 0.000 description 1
- 239000003245 coal Substances 0.000 description 1
- 230000008602 contraction Effects 0.000 description 1
- 238000002788 crimping Methods 0.000 description 1
- 230000006378 damage Effects 0.000 description 1
- 238000000151 deposition Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 239000007849 furan resin Substances 0.000 description 1
- 230000006698 induction Effects 0.000 description 1
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical group C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 229920002239 polyacrylonitrile Polymers 0.000 description 1
- 239000002861 polymer material Substances 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 239000002964 rayon Substances 0.000 description 1
- 229920001059 synthetic polymer Polymers 0.000 description 1
Landscapes
- Press-Shaping Or Shaping Using Conveyers (AREA)
- Powder Metallurgy (AREA)
Description
【発明の詳細な説明】
（産業上の利用分野）
この発明は、常圧下、あるいは減圧下において
セラミツク又は金属等の圧着、焼結に使用するホ
ツトプレス装置の炉芯部を構成するホツトプレス
用カーボン鋳型に関する。Detailed Description of the Invention (Field of Industrial Application) This invention relates to a carbon mold for a hot press that constitutes a furnace core of a hot press device used for crimping and sintering ceramics, metals, etc. under normal pressure or reduced pressure. Regarding.
（従来の技術）
従来、ホツトプレス装置はセラミツクや金属、
あるいは複合材料などの粉体あるいは仮成形体を
加圧焼結するのに広く使用されている。(Conventional technology) Conventionally, hot press equipment has been used to press ceramics, metals,
It is also widely used for pressure sintering powders or temporary compacts such as composite materials.
このホツトプレス装置の炉芯部は、第１図に示
すように、被焼結体４を充填する筒形状のカーボ
ン鋳型１、発熱体（誘導加熱ではコイル、抵抗加
熱ではヒータ）２、断熱材３、スペーサ５、押棒
６、押台７により構成されている。 As shown in Fig. 1, the furnace core of this hot press device consists of a cylindrical carbon mold 1 filled with a material to be sintered 4, a heating element (a coil for induction heating, a heater for resistance heating) 2, and a heat insulating material 3. , a spacer 5, a push rod 6, and a push stand 7.
カーボン鋳型は耐熱性の点で最もすぐれたもの
の一つであるが、カーボン鋳型の素材であるカー
ボン成形体は脆性材料であるので、押棒で300
Kg／cm2以上の圧力をかけホツトプレスする場合、
突然クラツクが入り破壊されることがある。 Carbon molds are one of the best in terms of heat resistance, but since the carbon molded body that is the material for carbon molds is a brittle material, it can be
When hot pressing by applying pressure of Kg/cm2 or more ,
Sometimes a crack suddenly occurs and the device is destroyed.
このようなカーボン鋳型の突然の破壊を防止す
るため、実開昭62−107907号公報には、カーボン
鋳型の外面にＣ／Ｃ複合体を一体に固着形成して
なるカーボン鋳型が記載されている。 In order to prevent such sudden destruction of the carbon mold, Japanese Utility Model Application No. 62-107907 describes a carbon mold in which a C/C composite is integrally formed on the outer surface of the carbon mold. .
（発明が解決しようとする問題点）
しかしながら、実開昭62−107907号公報に記載
のカーボン鋳型は、炉芯部の加圧加熱、冷却の繰
り返しにより外面のＣ／Ｃ複合体がクリープを起
こし、カーボン鋳型の補強効果が早期になくなつ
てしまうという問題があつた。これは、カーボン
鋳型の基材である黒鉛とＣ／Ｃ複合体との熱膨張
係数が異なるためであると思われる。すなわち、
加圧加熱時は熱膨張係数の小さいＣ／Ｃ複合体が
熱膨張係数の大きい黒鉛の膨張を押さえようと
し、丁度、桶をたがで締めつけているようにＣ／
Ｃ複合体がカーボン鋳型の割れを防止するように
作用するが、逆に冷却時にはＣ／Ｃ複合体が黒鉛
の正常な収縮に追従できず、変形したり、ほぐれ
たりする。さらに、Ｃ／Ｃ複合体と黒鉛との固着
状態がなくなり、同時に炉芯部の加圧加熱、冷却
の繰り返しにより、Ｃ／Ｃ複合体が当初の形状よ
りも広がつてしまい黒鉛からなるカーボン鋳型の
補強効果がなくなつてしまう。丁度、桶を締めつ
ているたがが何回もの加圧加熱、冷却の繰り返し
によつて緩んでしまうようにＣ／Ｃ複合体の戻り
がなくなつてしまうからである。(Problems to be Solved by the Invention) However, in the carbon mold described in Utility Model Application Publication No. 62-107907, the C/C composite on the outer surface causes creep due to repeated pressure heating and cooling of the furnace core. However, there was a problem in that the reinforcing effect of the carbon mold quickly disappeared. This seems to be because the thermal expansion coefficients of graphite, which is the base material of the carbon mold, and the C/C composite are different. That is,
During pressurized heating, the C/C composite with a small coefficient of thermal expansion tries to suppress the expansion of graphite, which has a large coefficient of thermal expansion, and the C/C composite has a small coefficient of thermal expansion and tries to suppress the expansion of graphite, which has a large coefficient of thermal expansion.
The C/C composite acts to prevent the carbon mold from cracking, but on the contrary, the C/C composite cannot follow the normal contraction of graphite and deforms or loosens during cooling. Furthermore, the adhesion state between the C/C composite and the graphite disappears, and at the same time, due to the repeated pressure heating and cooling of the furnace core, the C/C composite expands beyond its original shape and becomes a carbon mold made of graphite. The reinforcing effect is lost. This is because the C/C composite will no longer be able to return, just as a hoop tightening a tub will loosen after repeated pressurization, heating, and cooling.
この発明は、このような事情に鑑みなされたも
のであり、黒鉛からなるカーボン鋳型の脆性をカ
バーし、さらにカーボン鋳型の補強効果の早期喪
失を防止して、長期間使用することができるホツ
トプレス用カーボン鋳型を提供しようとするもの
である。 This invention was made in view of these circumstances, and provides a hot press that can be used for a long period of time by covering the brittleness of carbon molds made of graphite, and further preventing early loss of the reinforcing effect of carbon molds. The aim is to provide carbon molds.
（問題点を解決しようとする手段）
すなわち、本発明は、ホツトプレス装置の炉芯
部を構成する筒形状のカーボン鋳型の筒壁内部に
カーボン鋳型内に充填された被焼結体の充填部位
を包囲するようにＣ／Ｃ複合体を嵌着してなるこ
とを特徴とするホツトプレス用カーボン鋳型を、
その要旨としている。(Means for Solving the Problems) That is, the present invention provides a filling portion of the object to be sintered filled in the carbon mold inside the cylindrical wall of the cylindrical carbon mold constituting the furnace core of the hot press device. A carbon mold for hot pressing characterized by a C/C composite fitted in a surrounding manner,
This is the summary.
Ｃ／Ｃ複合体はポリアクリロニトリル、レーヨ
ン、フエノール樹脂等の合成高分子材料を出発原
料とする炭素繊維か、又は石油ピツチ、石炭ピツ
チ等を出発原料とする炭素繊維を用いて、筒状の
構造に組み立てられ、次いでこれらの構造体はフ
エノール樹脂やフラン樹脂等の炭化性樹脂を含浸
したり、ピツチ類を含浸し、硬化後、700℃以上
で焼成炭化することにより得られる。より緻密で
高強度のＣ／Ｃ複合体を得るには樹脂含浸−硬化
−炭化のプロセスを数回繰り返すのがよい。 The C/C composite has a cylindrical structure using carbon fibers made from synthetic polymer materials such as polyacrylonitrile, rayon, and phenolic resins, or carbon fibers made from petroleum pits, coal pits, etc. These structures are then obtained by impregnating carbonizable resins such as phenolic resins and furan resins or by impregnating them with pitch, and after hardening, firing and carbonizing them at 700°C or higher. In order to obtain a denser and higher strength C/C composite, it is preferable to repeat the resin impregnation-hardening-carbonization process several times.
又、Ｃ／Ｃ複合体は、前記樹脂含浸による方法
に換えて、CVD処理によつて熱分解炭素を炭素
繊維構造体内に均一に沈着させることによつて得
ることもできる。 Furthermore, instead of the resin impregnation method described above, the C/C composite can also be obtained by uniformly depositing pyrolytic carbon within a carbon fiber structure by CVD treatment.
こうして得られた筒状のＣ／Ｃ複合体は、第２
図及び第３図に示すように筒形状の黒鉛からなる
カーボン鋳型１の筒壁内部に嵌着され、カーボン
鋳型１が構成される。 The cylindrical C/C composite thus obtained is
As shown in the drawings and FIG. 3, the carbon mold 1 is constructed by being fitted inside the cylinder wall of a carbon mold 1 made of cylindrical graphite.
このように嵌着されるＣ／Ｃ複合体８は、第４
図に示すように、加圧加熱時の圧力を最も受ける
カーボン鋳型１内に充填された被焼結体４の充填
部位を包囲するように設置されていればよい。し
かしながら、本発明に係るカーボン鋳型の構成に
おいてはＣ／Ｃ複合体８が被焼結体４の充填部位
よりも広く包囲するように設置されることを妨げ
ない。 The C/C composite 8 fitted in this way is the fourth
As shown in the figure, it is sufficient that it is installed so as to surround the filling part of the object to be sintered 4 filled in the carbon mold 1 which receives the most pressure during pressurization and heating. However, in the configuration of the carbon mold according to the present invention, the C/C composite body 8 may be installed so as to surround the area wider than the filling area of the object 4 to be sintered.
第５図又は第６図は、Ｃ／Ｃ複合体８が嵌着さ
れた部分以外の部分について、黒鉛からなるカー
ボン鋳型１の一部を省略した構造のカーボン鋳型
１を示している。このようにＣ／Ｃ複合体８が嵌
着されない部分については、従来のカーボン鋳型
１より薄い肉厚で形成することも応力のかかり方
から考えると可能であり、材料の軽減によるコス
ト低減を図ることができる。 FIG. 5 or FIG. 6 shows a carbon mold 1 having a structure in which a part of the carbon mold 1 made of graphite is omitted from the part other than the part where the C/C composite 8 is fitted. In this way, it is possible to form the part where the C/C composite 8 is not fitted with a thinner wall thickness than the conventional carbon mold 1, considering the way stress is applied, and it is possible to reduce the cost by reducing the material used. be able to.
又、本発明に係るカーボン鋳型は、形状が円筒
形のものに限らず、第７図及び第８図に示すよう
に角筒形の筒形状のものも適用される。 Further, the carbon mold according to the present invention is not limited to a cylindrical mold, but may also be a rectangular cylindrical mold as shown in FIGS. 7 and 8.
（発明の作用）
本発明に係るカーボン鋳型は、ホツトプレス装
置の炉芯部を構成する筒形状のカーボン鋳型の筒
壁内部にカーボン鋳型内に充填された被焼結体の
充填部位を包囲するようにＣ／Ｃ複合体を嵌着し
てなる構成を採つているから次のような作用があ
る。(Function of the Invention) The carbon mold according to the present invention is arranged such that the cylindrical wall of the cylindrical carbon mold constituting the furnace core of the hot press device surrounds the filling area of the object to be sintered in the carbon mold. Since it has a structure in which a C/C composite is fitted to the inside, it has the following effects.
カーボン鋳型の加圧加熱時においては、熱膨張
率の小さいＣ／Ｃ複合体が、黒鉛からなるカーボ
ン鋳型の膨張を押さえるように作用して、カーボ
ン鋳型に割れを生じるのを防止する。 When the carbon mold is heated under pressure, the C/C composite having a small coefficient of thermal expansion acts to suppress the expansion of the carbon mold made of graphite, thereby preventing the carbon mold from cracking.
また、カーボン鋳型の冷却時においては、Ｃ／
Ｃ複合体より熱膨張率の大きいＣ／Ｃ複合体の外
側のカーボン鋳型が膨張状態にあつたＣ／Ｃ複合
体の戻りを助け、これによつて、Ｃ／Ｃ複合体が
伸びきつた状態に固定されるのを防止し、同時に
Ｃ／Ｃ複合体の変形やそれに伴うほぐれも防止す
る。 Also, when cooling the carbon mold, C/
The carbon mold on the outside of the C/C composite, which has a higher coefficient of thermal expansion than the C composite, helps the expanded C/C composite return to its original state, thereby causing the C/C composite to reach its fully extended state. This prevents the C/C composite from being fixed, and at the same time prevents deformation of the C/C composite and its accompanying loosening.
したがつて、本発明に係るカーボン鋳型は、
Ｃ／Ｃ複合体によつて長期間にわたつて黒鉛から
なるカーボン鋳型の補強効果を保ち続ける。 Therefore, the carbon mold according to the present invention has the following characteristics:
The C/C composite maintains the reinforcing effect of the carbon mold made of graphite over a long period of time.
（実施例）
次に、本発明を実施例によつて具体的に説明す
る。(Example) Next, the present invention will be specifically explained using examples.
実施例 １
炭素繊維を円筒形状の中子に一方向に巻きつ
け、フエノール樹脂に含浸し、硬化後、700℃で
焼成炭化してＣ／Ｃ複合体の中間体を作製した。
その後、更に４回フエノール樹脂含浸と焼成炭化
を繰り返し外径250mmΦ、内径230mmΦ、高さ250
mm及び外径250mmΦ、内径230mmΦ、高さ100mmの
Ｃ／Ｃ複合体２個を得た。Example 1 Carbon fibers were wound in one direction around a cylindrical core, impregnated with phenolic resin, cured, and then fired and carbonized at 700°C to produce a C/C composite intermediate.
After that, phenolic resin impregnation and firing carbonization were repeated four more times, outer diameter 250mmΦ, inner diameter 230mmΦ, height 250mm.
Two C/C composites with an outer diameter of 250 mmΦ, an inner diameter of 230 mmΦ, and a height of 100 mm were obtained.
このＣ／Ｃ複合体の大きさに合わせ、等方性黒
鉛からなる円筒形状のカーボン鋳型に嵌着溝を形
成し、この嵌着溝内に前記Ｃ／Ｃ複合体を嵌着さ
せて、第２図及び第４図に示すようなカーボン鋳
型２個を作製した。 A fitting groove is formed in a cylindrical carbon mold made of isotropic graphite according to the size of the C/C composite, and the C/C composite is fitted into the fitting groove. Two carbon molds as shown in FIGS. 2 and 4 were produced.
一方、Ｃ／Ｃ複合体を嵌着させない同質の等方
性黒鉛からなる同一寸法の円筒形状のカーボン鋳
型を比較例として、これらを窒化珪素の粉体のホ
ツトプレスに使用した。 On the other hand, as a comparative example, cylindrical carbon molds of the same size made of homogeneous isotropic graphite without a C/C composite were used for hot pressing of silicon nitride powder.
この結果、実施例１のカーボン鋳型はＣ／Ｃ複
合体を嵌着させない比較例のカーボン鋳型に比べ
て、第２図のカーボン鋳型は15倍、第４図のカー
ボン鋳型は10倍のライフアツプが図れた。 As a result, the life-up of the carbon mold of Example 1 is 15 times that of the carbon mold of Example 1, and that of the carbon mold of FIG. was achieved.
実施例 ２
炭素繊維を角筒形状の中子に一方向に巻きつ
け、繊維間隙にCVD処理によつて熱分解炭素を
沈着させ、外形寸法300mm×400mm×100mm、厚み
10mmのＣ／Ｃ複合体を得た。Example 2 Carbon fibers were wound in one direction around a rectangular tube-shaped core, and pyrolytic carbon was deposited in the gaps between the fibers by CVD treatment, and the outer dimensions were 300 mm x 400 mm x 100 mm, and the thickness was
A 10 mm C/C composite was obtained.
このＣ／Ｃ複合体の大きさに合わせ、等方性黒
鉛からなる円筒形状のカーボン鋳型に嵌着溝を形
成し、この嵌着溝内に前記Ｃ／Ｃ複合体を嵌着さ
せて、第７図に示すようなカーボン鋳型を作製し
た。 A fitting groove is formed in a cylindrical carbon mold made of isotropic graphite according to the size of the C/C composite, and the C/C composite is fitted into the fitting groove. A carbon mold as shown in Fig. 7 was prepared.
一方、Ｃ／Ｃ複合体を嵌着させない同質の等方
性黒鉛からなる同一寸法の角筒形状のカーボン鋳
型を比較例として、両者を窒化珪素の粉体のホツ
トプレスに使用した。 On the other hand, as a comparative example, a square tube-shaped carbon mold of the same size and made of isotropic graphite of the same quality without the C/C composite fitted therein was used for hot pressing of silicon nitride powder.
この結果、実施例２のカーボン鋳型はＣ／Ｃ複
合体を嵌着させない比較例のカーボン鋳型に比べ
て、12倍のライフアツプが図れた。 As a result, the life of the carbon mold of Example 2 was 12 times longer than that of the carbon mold of the comparative example in which the C/C composite was not fitted.
（発明の効果）
以上説明したように、本発明に係るカーボン鋳
型は、従来のカーボン鋳型に比べ、高強度とする
ことができるとともに、冷却時のＣ／Ｃ複合体の
戻りを確実にして、変形やほぐれを防止し大巾な
ライフアツプを図ることができる。(Effects of the Invention) As explained above, the carbon mold according to the present invention can have higher strength than conventional carbon molds, and also ensures the return of the C/C composite during cooling. It prevents deformation and unraveling and greatly extends its life.
第１図はホツトプレス装置の炉芯部の概略をあ
らわした断面図、第２図は本発明に係るカーボン
鋳型の一実施例を示す断面図、第３図は第２図Ａ
−Ａ線の断面図、第４図から第７図までのそれぞ
れは本発明に係るカーボン鋳型の各実施例を示す
断面図、第８図は第７図Ｂ−Ｂ線の断面図であ
る。
符号の説明、１……カーボン鋳型、２……発熱
体、３……断熱材、４……被焼結体、５……スペ
ーサ、６……押棒、７……押台、８……Ｃ／Ｃ複
合体。
Fig. 1 is a sectional view schematically showing the furnace core of a hot press device, Fig. 2 is a sectional view showing an embodiment of a carbon mold according to the present invention, and Fig. 3 is Fig. 2A.
4 to 7 are sectional views showing each embodiment of the carbon mold according to the present invention, and FIG. 8 is a sectional view taken along line B-B in FIG. 7. Explanation of symbols, 1...Carbon mold, 2...Heating element, 3...Insulating material, 4...Sintered body, 5...Spacer, 6...Push bar, 7...Push stand, 8...C /C complex.
Claims (1)
のカーボン鋳型の筒壁内部にカーボン鋳型内に充
填された被焼結体の充填部位を包囲するように
Ｃ／Ｃ複合体を嵌着してなることを特徴とするホ
ツトプレス用カーボン鋳型。1 A C/C composite is fitted into the cylindrical wall of a cylindrical carbon mold constituting the furnace core of a hot press device so as to surround the filling area of the object to be sintered filled in the carbon mold. A carbon mold for hot press characterized by the following.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP31803987A JPH01157804A (en) | 1987-12-15 | 1987-12-15 | Carbon molding die for hot press |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP31803987A JPH01157804A (en) | 1987-12-15 | 1987-12-15 | Carbon molding die for hot press |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH01157804A JPH01157804A (en) | 1989-06-21 |
| JPH0523563B2 true JPH0523563B2 (en) | 1993-04-05 |
Family
ID=18094811
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP31803987A Granted JPH01157804A (en) | 1987-12-15 | 1987-12-15 | Carbon molding die for hot press |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH01157804A (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107379619A (en) * | 2017-07-25 | 2017-11-24 | 北京理工大学 | A kind of powder presser die and tabletting method for being easy to move back mould |
-
1987
- 1987-12-15 JP JP31803987A patent/JPH01157804A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPH01157804A (en) | 1989-06-21 |
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