JP6700068B2 - Bonding method of carbon sheet in multi-axis electrification sintering device - Google Patents
Bonding method of carbon sheet in multi-axis electrification sintering device Download PDFInfo
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Description
本発明は、粉体材料を加圧しながら通電して焼結する通電焼結装置に関するものである。 The present invention relates to an electric current sintering apparatus that sinters a powder material by applying current while applying pressure.
従来、粉体材料を加圧しながら通電して焼結する通電焼結装置として、一軸通電焼結装置と多軸通電焼結装置とがある。 BACKGROUND ART Conventionally, there are a uniaxial energization sintering device and a multiaxial energization sintering device as an energization sintering device for energizing and sintering a powder material while applying pressure.
図５に示す一軸通電焼結装置２００は、真空容器２７０内の成形型２８０に入れられた粉体材料に対して、上方にスペーサー２１１，２１２及び上パンチ２１３を配置し、下方にスペーサー２２１，２２２及び下パンチ２２３を配置し、上下方向の加圧通電軸２１０，２２０により加圧通電して、焼結体２９０を生成するものである。一軸通電焼結装置は、加圧と通電に同じ軸を使用することから、焼結部分の径方向（水平方向）の温度分布が不均一となりやすい。その欠点を改良すべく、加圧軸と通電軸とを分離したものが多軸通電焼結装置である。 In the uniaxial electric sintering apparatus 200 shown in FIG. 5, the spacers 211 and 212 and the upper punch 213 are arranged above the powder material placed in the molding die 280 in the vacuum container 270, and the spacer 221, below. 222 and a lower punch 223 are arranged, and pressure is applied by the pressure applying shafts 210 and 220 in the vertical direction to generate a sintered body 290. Since the same shaft is used for pressurization and energization in the uniaxial energization sintering device, the temperature distribution in the radial direction (horizontal direction) of the sintered portion tends to be non-uniform. In order to improve the drawback, a multi-axis electrification sintering device is one in which a pressure axis and an electrification axis are separated.
図６に示す多軸通電焼結装置１００は、真空容器７０内の成形型８０に入れられた粉体材料を、上下方向の加圧軸１０，２０により加圧し、水平方向の通電軸（Ａ）３０，４０及び通電軸（Ｂ）５０，６０により通電するようになっている。そして、通電軸による通電方法に関して、特許文献１には、加圧下にある粉体材料を収納する筒状の型の側面の周囲に、２本一対を１組とした電極を複数組配設して、各組の一対の電極に対する通電を交互に切り換えながら粉体材料に熱を付与するようにした多軸通電焼結装置に関する発明が記載されている。 In the multi-axis electrification sintering apparatus 100 shown in FIG. 6, the powder material placed in the molding die 80 in the vacuum container 70 is pressed by the pressurizing shafts 10 and 20 in the vertical direction, and the horizontal electrifying shaft (A ) 30, 40 and energizing shafts (B) 50, 60 for energizing. Regarding the energization method by the energization shaft, in Patent Document 1, a plurality of sets of two pairs are provided around the side surface of a cylindrical mold that stores the powder material under pressure. Thus, an invention relating to a multi-axis electrification sintering device in which heat is applied to a powder material while alternately energizing a pair of electrodes in each set is described.
ここで、多軸通電焼結装置における通電軸と成形型８０との間には、カーボンシートが配置されている。図７は、多軸通電焼結装置におけるカーボンシートの配置図である。このカーボンシート１は、例えば０．８ｍｍ程度の厚さの黒鉛フィルムであって、通電軸３０，４０と成形型８０との間に配置されており、通電軸と成形型との接触面を均一にして、通電軸からの電流の流れが成形型に均一に広がるようにするためのものである。通電軸と成形型との接触面は、微細な凹凸の存在により必ずしも鏡のように平滑ではなく、もしカーボンシートがなければ、成形型が不均一に加熱されて最悪の場合割れてしまう。 Here, a carbon sheet is arranged between the energizing shaft and the molding die 80 in the multi-axis energizing sintering device. FIG. 7 is a layout diagram of carbon sheets in a multi-axis electrification sintering apparatus. The carbon sheet 1 is, for example, a graphite film having a thickness of about 0.8 mm and is arranged between the current-carrying shafts 30 and 40 and the molding die 80, and has a uniform contact surface between the current-carrying shaft and the molding die. Thus, the current flow from the current-carrying shaft is spread evenly in the mold. The contact surface between the current-carrying shaft and the mold is not always smooth like a mirror due to the presence of fine irregularities, and if the carbon sheet is not present, the mold will be unevenly heated and cracked in the worst case.
従来、カーボンシート１の配置にあたっては、通電軸の先端側にカーボンシート１を支持するための治具を設けて、その治具にカーボンシート１を差し込む等により配置していた。しかしながら、カーボンシート１を治具により支持する構造では、カーボンシート１のずれ、曲がり、折れ、割れ等が生じやすく、頻繁に取り替えが必要であった。 Conventionally, when arranging the carbon sheet 1, a jig for supporting the carbon sheet 1 is provided on the tip end side of the current-carrying shaft, and the carbon sheet 1 is inserted into the jig. However, in the structure in which the carbon sheet 1 is supported by a jig, the carbon sheet 1 is apt to be displaced, bent, bent, cracked, or the like, so that the carbon sheet 1 needs to be frequently replaced.
これに対して、カーボンシート１を、通電軸の先端側に樹脂接着剤で接着することが行われている。これにより、カーボンシート１のずれや破損の抑制を少しは改善できるものの、樹脂接着剤は通電軸からの通電により加熱されると、すぐに炭になってしまうため、接着力に問題があった。 On the other hand, the carbon sheet 1 is bonded to the tip end side of the current-carrying shaft with a resin adhesive. Thereby, although the displacement and damage of the carbon sheet 1 can be suppressed a little, the resin adhesive becomes charcoal immediately when it is heated by the energization from the energizing shaft, so that there is a problem in the adhesive strength. .
本発明は、上記従来の課題を解決するものであり、多軸通電焼結装置における通電軸と成形型との間に配置するカーボンシートを強固に接着することの可能な、多軸通電焼結装置におけるカーボンシートの接着方法を提供するものである。 The present invention is to solve the above-mentioned conventional problems, and is capable of firmly adhering a carbon sheet arranged between an energizing shaft and a molding die in the multi-axis energizing sintering device, the multi-axis energizing sintering. A method for adhering a carbon sheet in an apparatus is provided.
上記課題を解決するため、本発明の多軸通電式焼結装置におけるカーボンシートの接着方法は、上下方向の加圧軸と水平方向の通電軸とを備え、成形型内の粉体材料を前記加圧軸により加圧しながら前記通電軸により通電して焼結する通電焼結装置における、前記通電軸又は前記成形型へのカーボンシートの接着方法であって、前記カーボンシートをピッチにより接着することを特徴とする。 In order to solve the above-mentioned problems, a method for adhering a carbon sheet in a multi-axis electrification type sintering apparatus of the present invention comprises a vertical pressing axis and a horizontal energizing axis, and the powder material in a molding die is A method for adhering a carbon sheet to the current-carrying shaft or the molding die in a current-carrying sintering apparatus, wherein current is applied by the current-carrying shaft and sintered while being pressed by a pressure shaft, wherein the carbon sheet is bonded with a pitch. Is characterized by.
また好ましくは、前記ピッチがメソフィーズピッチであることを特徴とする。 Further preferably, the pitch is a mesophase pitch.
また好ましくは、前記通電軸の先端が黒鉛であることを特徴とする。 Further, preferably, the tip of the current-carrying shaft is made of graphite.
また好ましくは、前記通電軸の先端が銅であって、前記通電軸の先端に微細な凹凸が形成されていることを特徴とする。 Further preferably, the tip of the current-carrying shaft is made of copper, and fine irregularities are formed on the tip of the current-carrying shaft.
本発明の多軸通電式焼結装置におけるカーボンシートの接着方法は、上下方向の加圧軸と水平方向の通電軸とを備え、成形型内の粉体材料を加圧軸により加圧しながら通電軸により通電して焼結する通電焼結装置における、通電軸又は成形型へのカーボンシートの接着方法であり、カーボンシートをピッチにより接着するものである。接着剤として塗布されたピッチは、粉末状のものであっても、通電軸からの通電により加熱されると液状になってカーボンシートに染み込んでいく。そして、加熱が進むにつれて炭化した後さらに黒鉛化して、カーボンシートと通電軸又はカーボンシートと成形型を強固に接合する。従って、樹脂接着剤のように加熱によりすぐに炭になるだけではなく接着力が大きい。 A method for adhering a carbon sheet in a multi-axis electrification type sintering apparatus of the present invention comprises an up-down pressing axis and a horizontal energizing axis, and energizes while pressing a powder material in a molding die by the pressing axis. This is a method for adhering a carbon sheet to an energizing shaft or a molding die in an energizing sintering device that energizes and sinters a shaft, and bonds the carbon sheet with a pitch. The pitch applied as an adhesive, even if it is in the form of powder, becomes liquid when it is heated by energization from the energizing shaft and soaks into the carbon sheet. Then, as the heating progresses, it is carbonized and then graphitized to firmly bond the carbon sheet and the current-carrying shaft or the carbon sheet and the mold. Therefore, not only does it become charcoal immediately when heated like a resin adhesive, but it also has a large adhesive force.
また、ピッチがメソフィーズピッチである場合には、分子構造に規則性があり熱処理に適しているため好ましい。 Further, when the pitch is a mesophase pitch, the molecular structure has regularity and is suitable for heat treatment, which is preferable.
また、通電軸の先端が黒鉛である場合には、加熱されたピッチが通電軸側にも染み込みやすく、より強固に接合できる。 Further, when the tip of the current-carrying shaft is made of graphite, the heated pitch easily penetrates into the current-carrying shaft side, so that more firm bonding can be achieved.
また、通電軸の先端が銅であって、通電軸の先端に微細な凹凸が形成されている場合には、アンカー効果で、より強固に接合できる。 In addition, when the tip of the current-carrying shaft is copper and the tip of the current-carrying shaft has fine irregularities, it is possible to more firmly bond due to the anchor effect.
このように、本発明の多軸通電焼結装置におけるカーボンシートの接着方法によれば、多軸通電焼結装置における通電軸と成形型との間に配置するカーボンシートを強固に接着することが可能である。 As described above, according to the method for adhering a carbon sheet in a multi-axis electric current sintering apparatus of the present invention, it is possible to firmly adhere a carbon sheet arranged between an electric current axis and a molding die in the multi-axis electric current sintering apparatus. It is possible.
次に、図１乃至図４を参照して、本発明の実施形態に係る多軸通電焼結装置におけるカーボンシートの接着方法について説明する。本実施形態に係る多軸通電焼結装置の全体構成は、従来例として説明した図６に示す多軸通電焼結装置１００と同様であり、真空容器７０内の成形型８０に入れられた粉体材料を、上下方向の加圧軸１０，２０により加圧し、水平方向の通電軸３０，４０及び通電軸５０，６０により通電するようにしたものである。 Next, with reference to FIG. 1 to FIG. 4, a method for adhering a carbon sheet in a multi-axis current sintering apparatus according to an embodiment of the present invention will be described. The overall configuration of the multi-axis current sintering device according to the present embodiment is the same as that of the multi-axis current sintering device 100 shown in FIG. 6 described as a conventional example, and the powder placed in the molding die 80 in the vacuum container 70 is powder. The body material is pressed by the pressing shafts 10 and 20 in the vertical direction, and is energized by the energizing shafts 30 and 40 and the energizing shafts 50 and 60 in the horizontal direction.
（実施形態１）
図１に示す実施形態１は、カーボンシート１を通電軸３０及び通電軸４０の先端（電極）に接着して貼り付けたものである。カーボンシート１は、例えば０．８ｍｍ程度の厚さの黒鉛フィルムである。また、接着剤としてピッチを用いる。なお、用いるピッチは、粉末や液体のものを用いることができ、その種類も特に限定されるものではないが、接着力の観点からは、分子構造に規則性があり熱処理に適したメソフェーズピッチを用いることが好ましい。
(Embodiment 1)
In the first embodiment shown in FIG. 1, the carbon sheet 1 is adhered and attached to the tips (electrodes) of the current-carrying shaft 30 and the current-carrying shaft 40. The carbon sheet 1 is, for example, a graphite film having a thickness of about 0.8 mm. Also, pitch is used as an adhesive. The pitch used may be powder or liquid, and the type thereof is not particularly limited, but from the viewpoint of adhesive strength, a mesophase pitch having a regular molecular structure and suitable for heat treatment is used. It is preferable to use.
カーボンシート１と通電軸３０，４０との間に塗布されたピッチは、通電軸による通電により加熱されると、粉末状のものであっても液状になってカーボンシート１に染み込んでいき、加熱が進むにつれて炭化した後さらに黒鉛化する。従って、樹脂接着剤のように加熱によりすぐに炭になるだけではなく、黒鉛化によりカーボンシート１と通電軸３０，４０とを強固に接合する。なお、メソフィーズピッチの場合、１４０℃〜３５０℃程度でカーボンシート１に染み込む。 When the pitch applied between the carbon sheet 1 and the current-carrying shafts 30 and 40 is heated by the current-carrying by the current-carrying shaft, even if it is a powder, it becomes liquid and permeates the carbon sheet 1 to heat it. Is carbonized and then graphitized. Therefore, not only is the charcoal converted to carbon immediately by heating like a resin adhesive, but the carbon sheet 1 and the current-carrying shafts 30 and 40 are firmly bonded by graphitization. In the case of mesophase pitch, the carbon sheet 1 is impregnated at about 140°C to 350°C.
図２に示すように、通電軸３０の先端が黒鉛電極３１の場合には、通電軸による通電によりピッチが加熱されると、カーボンシート１とともに黒鉛電極３１にも染み込んでいくため、より強固に接着することができる。 As shown in FIG. 2, in the case where the tip of the current-carrying shaft 30 is the graphite electrode 31, when the pitch is heated by the current-carrying by the current-carrying shaft, the pitch permeates into the graphite electrode 31 together with the carbon sheet 1, so that it becomes firmer. Can be glued.
一方、図３（ａ）に示すように、通電軸３０の先端が銅である場合には、加熱されたピッチが通電軸側に染み込まない。従って、図３（ｂ）に示すように、通電軸３０の先端に微細な溝３２を形成することにより、アンカー効果で、より強固に接着することができる。また、溝３２をアリ溝（開口部が狭く底部が広い台形の溝）とすれば、よりアンカー効果が得られるため好ましい。なお、アンカー効果を生じさせるためには、溝３２に限らずその他の微細な凹凸を形成することができる。また、黒鉛電極の場合に比べて、カーボンシート１の厚みを若干厚くして２ｍｍ程度とすることが好ましい。 On the other hand, as shown in FIG. 3A, when the tip of the current-carrying shaft 30 is copper, the heated pitch does not soak into the current-carrying shaft side. Therefore, as shown in FIG. 3B, by forming the fine groove 32 at the tip of the current-carrying shaft 30, it is possible to more firmly bond due to the anchor effect. Further, it is preferable that the groove 32 is a dovetail groove (a trapezoidal groove having a narrow opening and a wide bottom) because an anchor effect can be further obtained. In addition, in order to generate the anchor effect, not only the groove 32 but also other fine irregularities can be formed. Further, it is preferable that the thickness of the carbon sheet 1 be slightly thicker than that of the graphite electrode to be about 2 mm.
（実施形態２）
図４に示す実施形態２は、カーボンシート１を成形型８０に接着して貼り付けたものである。使用するカーボンシート１や接着材としてのピッチは、実施形態１と同様である。
(Embodiment 2)
In the second embodiment shown in FIG. 4, the carbon sheet 1 is adhered and attached to a molding die 80. The carbon sheet 1 used and the pitch as the adhesive material are the same as those in the first embodiment.
カーボンシート１を接着する成形型８０は黒鉛であるため、通電軸による通電によりピッチが加熱されると、カーボンシート１とともに成形型８０にも染み込んでいくため、より強固に接着することができる。 Since the molding die 80 for adhering the carbon sheet 1 is graphite, when the pitch is heated by the energization by the energizing shaft, the pitch penetrates into the molding die 80 together with the carbon sheet 1, so that the bonding can be made more firmly.
本実施形態に係る多軸通電式焼結装置におけるカーボンシートの接着方法は、上下方向の加圧軸１０，２０と水平方向の通電軸３０，４０，５０，６０とを備え、成形型８０内の粉体材料を加圧軸１０，２０により加圧しながら通電軸３０，４０，５０，６０により通電して焼結する通電焼結装置における、通電軸３０，４０，５０，６０又は成形型８０へのカーボンシート１の接着方法であり、カーボンシート１をピッチにより接着するものである。接着剤として塗布されたピッチは、粉末状のものであっても、通電軸３０，４０，５０，６０からの通電により加熱されると液状になってカーボンシート１に染み込んでいく。そして、加熱が進むにつれて炭化した後さらに黒鉛化して、カーボンシート１と通電軸３０，４０，５０，６０又はカーボンシート１と成形型８０を強固に接合する。従って、樹脂接着剤のように加熱によりすぐに炭になるだけではなく接着力が大きい。 The method for adhering a carbon sheet in the multi-axis electrification type sintering apparatus according to the present embodiment includes a vertical pressing shaft 10, 20 and a horizontal energizing shaft 30, 40, 50, 60, and the inside of the molding die 80. Of the powder material of the present invention, the current-carrying shaft 30, 40, 50, 60 or the molding die 80 in the current-carrying sintering device for powering and sintering the current-carrying shaft 30, 40, 50, 60 while pressing the powder material with the pressure shafts 10, 20. A method of adhering the carbon sheet 1 to the carbon sheet 1 by means of a pitch. The pitch applied as an adhesive, even if it is in powder form, becomes liquid when it is heated by the electric current from the current-carrying shafts 30, 40, 50, 60, and soaks into the carbon sheet 1. Then, as the heating progresses, it is carbonized and then graphitized to firmly bond the carbon sheet 1 and the current-carrying shafts 30, 40, 50, 60 or the carbon sheet 1 and the molding die 80. Therefore, not only does it become charcoal immediately when heated like a resin adhesive, but it also has a large adhesive force.
また、ピッチがメソフィーズピッチである場合には、分子構造に規則性があり熱処理に適しているため好ましい。 Further, when the pitch is a mesophase pitch, the molecular structure has regularity and is suitable for heat treatment, which is preferable.
また、通電軸の先端が黒鉛である場合には、加熱されたピッチが通電軸側にも染み込みやすく、より強固に接合できる。 Further, when the tip of the current-carrying shaft is made of graphite, the heated pitch easily penetrates into the current-carrying shaft side, so that more firm bonding can be achieved.
また、通電軸の先端が銅であって、通電軸の先端に微細な凹凸（溝３２）が形成されている場合には、アンカー効果で、より強固に接合できる。 In addition, when the tip of the current-carrying shaft is copper and fine irregularities (grooves 32) are formed on the tip of the current-carrying shaft, the anchor effect enables more firm joining.
このように、本実施形態に係る多軸通電焼結装置におけるカーボンシートの接着方法によれば、多軸通電焼結装置における通電軸と成形型との間に配置するカーボンシートを強固に接着することが可能である。 As described above, according to the carbon sheet bonding method in the multi-axis current sintering device according to the present embodiment, the carbon sheet arranged between the current-carrying shaft and the molding die in the multi-axis current sintering device is firmly bonded. It is possible.
以上、本発明の実施形態に係る多軸通電焼結装置について説明したが、本発明は上述した実施の形態に限定されるわけではなく、その他種々の変更が可能である。 Although the multi-axis electric current sintering apparatus according to the embodiment of the present invention has been described above, the present invention is not limited to the above-described embodiment, and various modifications can be made.
１ カーボンシート
１０ 加圧軸
１５ 上パンチ
２０ 加圧軸
２５ 下パンチ
３０ 通電軸
３１ 黒鉛電極
３２ 溝
４０ 通電軸
５０ 通電軸
６０ 通電軸
７０ 真空容器
８０ 成形型
９０ 焼結体
１００ 多軸通電焼結装置
２００ 一軸通電焼結装置
２１０ 加圧通電軸
２１１ スペーサー
２１２ スペーサー
２１３ 上パンチ
２２０ 加圧通電軸
２２１ スペーサー
２２２ スペーサー
２２３ 下パンチ
２７０ 真空容器
２８０ 成形型
２９０ 焼結体
1 Carbon Sheet 10 Pressure Shaft 15 Upper Punch 20 Pressure Shaft 25 Lower Punch 30 Current Shaft 31 Graphite Electrode 32 Groove 40 Current Shaft 50 Current Shaft 60 Current Shaft 70 Vacuum Container 80 Mold 90 Sintered Body 100 Multi-axis Electric Sintering Device 200 Uniaxial energization sintering device 210 Pressurization energization shaft 211 Spacer 212 Spacer 213 Upper punch 220 Pressurization energization shaft 221 Spacer 222 Spacer 223 Lower punch 270 Vacuum container 280 Mold 290 Sintered body
Claims (4)
前記通電軸の先端が黒鉛であり、
前記カーボンシートをピッチにより接着することを特徴とする多軸通電式焼結装置におけるカーボンシートの接着方法。 Comprising a vertical pressing axis and the horizontal direction of the energization shaft, in current sintering device for sintering are energized by the energizing shaft while the powder material in the mold under pressure by the pressure application shaft, the energization A method for adhering a carbon sheet arranged between a shaft and the molding die to the current-carrying shaft ,
The tip of the current-carrying shaft is graphite,
A method for adhering a carbon sheet in a multi-axis electrification type sintering apparatus, characterized in that the carbon sheets are adhered by a pitch.
前記通電軸の先端が銅であり、前記通電軸の先端に微細な凹凸が形成されており、
前記カーボンシートをピッチにより接着することを特徴とする多軸通電式焼結装置におけるカーボンシートの接着方法。 Comprising a vertical pressing axis and the horizontal direction of the energization shaft, in current sintering device for sintering are energized by the energizing shaft while the powder material in the mold under pressure by the pressure application shaft, the energization A method for adhering a carbon sheet arranged between a shaft and the molding die to the current-carrying shaft ,
The tip of the current-carrying shaft is copper, fine irregularities are formed on the tip of the current-carrying shaft,
A method for adhering a carbon sheet in a multi-axis electrification type sintering apparatus, characterized in that the carbon sheets are adhered by a pitch.
前記成形型が黒鉛であり、
前記カーボンシートをピッチにより接着することを特徴とする多軸通電式焼結装置におけるカーボンシートの接着方法。 Comprising a vertical pressing axis and the horizontal direction of the energization shaft, in current sintering device for sintering are energized by the energizing shaft while the powder material in the mold under pressure by the pressure application shaft, the energization A method for adhering a carbon sheet arranged between a shaft and the mold to the mold ,
The mold is graphite,
A method for adhering a carbon sheet in a multi-axis electrification type sintering apparatus, characterized in that the carbon sheets are adhered by a pitch.
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| JPH0753847B2 (en) * | 1985-12-11 | 1995-06-07 | イビデン株式会社 | Bonded structure and manufacturing method thereof |
| JPS63112147A (en) * | 1986-10-30 | 1988-05-17 | イビデン株式会社 | Carbon and graphite bonding structure and manufacture thereof |
| JP3148839B2 (en) * | 1991-05-11 | 2001-03-26 | 日清紡績株式会社 | Adhesive for carbon material |
| FR2687998A1 (en) * | 1992-02-28 | 1993-09-03 | Aerospatiale | PROCESS FOR MANUFACTURING CARBON / CARBON COMPOSITE MATERIALS USING MESOPHASE POWDER |
| JP4226674B2 (en) * | 1997-01-20 | 2009-02-18 | 株式会社アカネ | Sintering method and sintering apparatus |
| JP2008095196A (en) * | 2006-09-08 | 2008-04-24 | Akane:Kk | Electric sintering device |
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