JPS61191508A - Production of carbonaceous material - Google Patents

Abstract

PURPOSE:To produce a carbonaneous material having a uniform structure while easily regulating the bulk density by molding a kneaded material consisting of a skeleton material and a binder, putting the molded body in a baking vessel at a specified space factor, and baking it. CONSTITUTION:A skeleton material is kneaded with a binder and molded. The molded body is put in a baking vessel at 1-50vol% space factor and baked. The baking vessel is made of ceramics such as SiC, Si3N4 or Al2O3, steel or the like.

Description

【発明の詳細な説明】 （産業上の利用分野） 本発明は炭素材の製造法に関する。[Detailed description of the invention] (Industrial application field) The present invention relates to a method for producing carbon materials.

（従来技術） 炭素材は、メカニカルシールに代表される機械的用途、
電機用ブラシに代表される電気的用途等広範囲な用途を
有し、黒鉛粉、コークス粉、油煙等の骨材とタールピン
チ、コールタール等の結合材とを混練した混練物を押出
成形、型造成形等により成形し、その成形体を焼成し、
必要に応じて黒鉛化処理を行なって製造される。(Prior art) Carbon materials are used for mechanical applications such as mechanical seals,
It has a wide range of uses, including electrical applications such as electrical brushes, and is made by extruding and molding a kneaded product made by kneading aggregates such as graphite powder, coke powder, and oil smoke with binders such as tar pinch and coal tar. Shape by molding etc., fire the molded body,
Manufactured by graphitization treatment if necessary.

炭素材に要求される諸特性は当然用途によって相違する
。例えば電機用ブラシは弾性率を小さくして整流子等と
の摺接性能を保持するが、このためには弾性率と相関関
係にあるかさ密度を小さくし、又シール、軸受等の機械
的用途に使われるものは耐摩耗性やシール性を良好にす
るため高密度にするのが一般である。炭素材のかさ密度
の調整は、従来成形圧力を変えて行なう方法がとられて
いた。これは炭素材のかさ密度は骨材の種類、骨材の粒
度、骨材と結合材との組成等によって相違するが９通常
約１トン／ｃｍ２の成形圧力までは比例的に増加するか
らである。Naturally, the various properties required of carbon materials differ depending on the use. For example, brushes for electrical machinery maintain sliding contact performance with commutators etc. by reducing the elastic modulus, but in order to do this, the bulk density, which has a correlation with the elastic modulus, must be reduced, and also for mechanical applications such as seals and bearings. The materials used for this purpose are generally made to have a high density to improve wear resistance and sealing properties. Conventionally, the bulk density of carbon materials has been adjusted by changing the molding pressure. This is because the bulk density of carbon material varies depending on the type of aggregate, the particle size of aggregate, the composition of aggregate and binder, etc., but it usually increases proportionally up to a molding pressure of about 1 ton/cm2. be.

（発明が解決しようとする問題点） しかしながら成形圧力が１トン／ｃｍ２未満であると得
られる炭素材の組織が不均一になり易く、成形圧力を１
トン／　ｃｍ”以上にすると炭素材の組織は均一になる
がかさ密度の増加率は小さくなり、焼成温度、昇温速度
等の焼成条件の影響を受けてかさ密度の調整が難かしく
なるという問題がある。(Problems to be Solved by the Invention) However, if the molding pressure is less than 1 ton/cm2, the structure of the carbon material obtained tends to be uneven, and the molding pressure is lower than 1 ton/cm2.
If the carbon material is increased to more than t/cm", the structure of the carbon material becomes uniform, but the rate of increase in bulk density becomes small, and the problem is that it becomes difficult to adjust the bulk density due to the influence of firing conditions such as firing temperature and heating rate. There is.

発明者は、焼成において焼成容器に充填する成形体の占
有容積によってかさ密度が変化することに着目し、更に
検討を加え本発明を完成するに至った。The inventor noticed that the bulk density changes depending on the volume occupied by the molded body filled into the firing container during firing, and after further study, the present invention was completed.

（問題点を解決するための手段） 本発明は、骨材及び結合材を混練後成形した成形体を焼
成する炭素材の製造法において、焼成容器内における前
記成形体の容積占有率が１〜５０チになるように焼成容
器内に成形体を充填して焼成する炭素材の製造法に関す
る。(Means for Solving the Problems) The present invention provides a method for producing a carbon material in which a molded body formed after kneading aggregate and a binder is fired, in which the volume occupancy of the molded body in a firing container is 1 to 1. The present invention relates to a method for manufacturing a carbon material, in which a firing container is filled with molded bodies to a size of 50 cm and fired.

本発明において、焼成容器の材質はセラミック。In the present invention, the material of the firing container is ceramic.

鋼材等焼成される雰囲気で変質及び変形しないものであ
ればよく特に制限はない。ＳｉＣ，５ｉｓＮ４゜Ａｅｚ
Ｏｓ等のセラミックが１３００℃でも安定で機械的強度
も強いので好ましい。焼成容器の形状・寸法にも特に制
限はないが通常は長方形のものを用いる。成形体の形状
・寸法は特に制限はない。There are no particular limitations as long as the material does not change or deform in the firing atmosphere, such as steel. SiC, 5isN4゜Aez
Ceramics such as Os are preferred because they are stable even at 1300° C. and have strong mechanical strength. There are no particular restrictions on the shape or dimensions of the firing container, but a rectangular one is usually used. There are no particular restrictions on the shape and dimensions of the molded body.

成形体の焼成容器中に占める容積が１チ未満では不経済
であるほか揮発分の散逸がはやく組織が不均一になるこ
とがあり、５０％を越えるとふくれや亀裂が発生して好
ましくない。骨材及び結合剤は公知のものを使用し、混
練、成形、焼成及び必要に応じて行なう黒鉛化は公知の
方法により特に制限はない。If the volume occupied by the molded body in the firing container is less than 1 inch, it is not economical, and volatile matter dissipates quickly and the structure may become non-uniform; if it exceeds 50%, blisters and cracks occur, which is undesirable. Known aggregates and binders are used, and kneading, molding, firing, and optionally graphitization are carried out by known methods without any particular limitations.

（実施例） 次に実施例を説明する。(Example) Next, an example will be described.

実施例１ 自家製油煙１０重量部とピッチコークス（日鉄化学製、
グレードＬＰＣ−Ａ）とを１００　μｍ以下に粉砕した
粉末９０重量部との混合粉に対しタールピッチ（用鉄化
学製、グレードＰＫ−Ｌ　）５６重量部を加え、混練機
に入れ１７０℃で５時間混練し冷却後平均粒径１５０μ
ｍに粉砕して成形粉とし、該成形粉を油圧プレスで１．
２トン／国２の成形圧により厚さ３０−９幅５５ａｎ、
長さ１１０薗、容積１８２ｃｍ３の成形体を作成した。Example 1 10 parts by weight of homemade oil smoke and pitch coke (manufactured by Nippon Steel Chemical Co., Ltd.)
56 parts by weight of tar pitch (Yotetsu Kagaku, grade PK-L) was added to a mixed powder of 90 parts by weight of powder obtained by pulverizing LPC-A) to 100 μm or less, and the mixture was placed in a kneader and heated at 170°C. Average particle size after kneading for hours and cooling: 150μ
The molded powder is crushed into 1.m powder using a hydraulic press.
Thickness 30-9 width 55an due to molding pressure of 2 tons/Country 2,
A molded body having a length of 110 mm and a volume of 182 cm3 was prepared.

次に前記成形体を材質がＳｉ３Ｎ＋、寸法が高さ２３０
ｍｍ、幅２２０ｍｍ、長さ２７０ｍｍ、内容積が１３７
００ｃｍ”の焼成容器に第１表に示す各枚数を入れ、空
間に詰粉としてコークス粉末を充填し、　Ｓｉ３Ｎ４製
の蓋をして電気炉に入れ１１００℃で５時間焼成し。Next, the molded body is made of Si3N+ and has a height of 230 mm.
mm, width 220mm, length 270mm, internal volume 137mm
The number of sheets shown in Table 1 was placed in a 00cm" baking container, the space was filled with coke powder as a filler, the lid made of Si3N4 was covered, and the pieces were placed in an electric furnace and baked at 1100°C for 5 hours.

冷却後焼成容器より焼成した炭素材を取出し黒鉛化炉に
詰めかえて２８００℃で黒鉛化を行なった。After cooling, the fired carbon material was taken out from the firing container and placed in a graphitization furnace, where it was graphitized at 2800°C.

得られた炭素材のかさ密度及び焼成時の焼成容器内に占
める成形体の占有率を第１表に示した。Table 1 shows the bulk density of the obtained carbon material and the occupancy rate of the molded body in the firing container during firing.

第１表 第１表から成形体の容積占有率を変えることによりかさ
密度の調整が可能であることがわかる。Table 1 It can be seen from Table 1 that the bulk density can be adjusted by changing the volume occupancy of the molded body.

また得られた炭素材の組織も均一であった。Furthermore, the structure of the obtained carbon material was also uniform.

実施例２ 実施例１と同じ成形粉を実施例１と同じ成形圧力で厚さ
１５圓９幅１５薗、長さ６０鵬、容積１３．５ｃｍ３の
成形体を得、この成形体３４５枚を実施例１と同じ焼成
容器に入れ（容積占有率３ｔ％）。Example 2 Using the same molding powder as in Example 1 and using the same molding pressure as in Example 1, a molded body with a thickness of 15 mm, 9 width, 60 cm, and a volume of 13.5 cm was obtained, and 345 pieces of this molded body were processed. Place in the same firing container as in Example 1 (volume occupancy 3t%).

つた。炭素材の組織も均一であった。Ivy. The structure of the carbon material was also uniform.

（発明の効果） 本発明によれば、成形圧力を変えず焼成工程において炭
素材のかさ密度の調整が可能となり、均一な組織の炭素
材が得られる。(Effects of the Invention) According to the present invention, the bulk density of the carbon material can be adjusted in the firing process without changing the molding pressure, and a carbon material with a uniform structure can be obtained.

Claims (1)

【特許請求の範囲】[Claims] １、骨材及び結合材を混練後成形した成形体を焼成する
炭素材の製造法において、焼成容器内における前記成形
体の容積占有率が１〜５０％になるように焼成器内に成
形体を充填して焼成することを特徴とする炭素材の製造
法。1. In a carbon material manufacturing method in which a molded body is fired after kneading aggregate and a binder, the molded body is placed in a firing vessel such that the volume occupancy of the molded body in the firing vessel is 1 to 50%. A method for producing a carbon material, characterized by filling and firing the carbon material.