JPS586787B2 - graphite electrode - Google Patents
graphite electrodeInfo
- Publication number
- JPS586787B2 JPS586787B2 JP55061179A JP6117980A JPS586787B2 JP S586787 B2 JPS586787 B2 JP S586787B2 JP 55061179 A JP55061179 A JP 55061179A JP 6117980 A JP6117980 A JP 6117980A JP S586787 B2 JPS586787 B2 JP S586787B2
- Authority
- JP
- Japan
- Prior art keywords
- graphite
- graphite electrode
- electrode
- gas
- pores
- 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
Links
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 title claims description 27
- 229910002804 graphite Inorganic materials 0.000 title claims description 20
- 239000010439 graphite Substances 0.000 title claims description 20
- 229910052799 carbon Inorganic materials 0.000 claims description 7
- 239000004215 Carbon black (E152) Substances 0.000 claims description 3
- 229930195733 hydrocarbon Natural products 0.000 claims description 3
- 238000000354 decomposition reaction Methods 0.000 claims 1
- 125000001183 hydrocarbyl group Chemical group 0.000 claims 1
- 230000003647 oxidation Effects 0.000 claims 1
- 238000007254 oxidation reaction Methods 0.000 claims 1
- 239000007789 gas Substances 0.000 description 9
- 239000011148 porous material Substances 0.000 description 7
- 239000007772 electrode material Substances 0.000 description 6
- 239000010410 layer Substances 0.000 description 5
- 238000006243 chemical reaction Methods 0.000 description 4
- 239000007770 graphite material Substances 0.000 description 4
- 230000001590 oxidative effect Effects 0.000 description 4
- UHOVQNZJYSORNB-UHFFFAOYSA-N Benzene Chemical compound C1=CC=CC=C1 UHOVQNZJYSORNB-UHFFFAOYSA-N 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- WCUXLLCKKVVCTQ-UHFFFAOYSA-M Potassium chloride Chemical compound [Cl-].[K+] WCUXLLCKKVVCTQ-UHFFFAOYSA-M 0.000 description 2
- 229910021383 artificial graphite Inorganic materials 0.000 description 2
- 238000007664 blowing Methods 0.000 description 2
- 238000000151 deposition Methods 0.000 description 2
- 238000010304 firing Methods 0.000 description 2
- 229910052736 halogen Inorganic materials 0.000 description 2
- 150000002367 halogens Chemical class 0.000 description 2
- 150000002430 hydrocarbons Chemical class 0.000 description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- 230000000704 physical effect Effects 0.000 description 2
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical compound [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 description 2
- 239000012495 reaction gas Substances 0.000 description 2
- 150000003839 salts Chemical class 0.000 description 2
- 239000003513 alkali Substances 0.000 description 1
- 239000010405 anode material Substances 0.000 description 1
- 239000011230 binding agent Substances 0.000 description 1
- 239000012159 carrier gas Substances 0.000 description 1
- 239000003518 caustics Substances 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 230000008021 deposition Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000005868 electrolysis reaction Methods 0.000 description 1
- 239000008151 electrolyte solution Substances 0.000 description 1
- 238000005087 graphitization Methods 0.000 description 1
- 238000005470 impregnation Methods 0.000 description 1
- 230000006698 induction Effects 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 239000012466 permeate Substances 0.000 description 1
- 229910052697 platinum Inorganic materials 0.000 description 1
- 238000012805 post-processing Methods 0.000 description 1
- 235000011164 potassium chloride Nutrition 0.000 description 1
- 239000001103 potassium chloride Substances 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000002791 soaking Methods 0.000 description 1
- 239000002344 surface layer Substances 0.000 description 1
- 239000011271 tar pitch Substances 0.000 description 1
- 230000004580 weight loss Effects 0.000 description 1
Landscapes
- Electrodes For Compound Or Non-Metal Manufacture (AREA)
- Electrolytic Production Of Metals (AREA)
Description
【発明の詳細な説明】 本発明は黒鉛電極に関するものである。[Detailed description of the invention] The present invention relates to graphite electrodes.
人造黒鉛は電導性に優れハロゲン過電圧が低く、苛性ア
ルカリ及びハロゲンに対する耐食性が極めて大きいので
、食塩、塩化カリウム等の水溶液電解用として白金に次
ぐ重要な電解用陽極材料となっている。Artificial graphite has excellent conductivity, low halogen overvoltage, and extremely high corrosion resistance against caustic alkali and halogens, so it has become the second most important electrolytic anode material after platinum for aqueous electrolysis of salt, potassium chloride, etc.
しかしながら人造黒鉛材は焼成→黒鉛化の熱処理時に、
成形時の結合剤として配合した揮発分が逃げるため体積
比で５乃至２０％の気孔が存在するので、この気孔が酸
化零囲気中で酸化消耗を促進させるという問題点がある
。However, when artificial graphite material is heat-treated from firing to graphitization,
Since 5 to 20% by volume of pores exist due to the escape of volatile components blended as a binder during molding, there is a problem that these pores accelerate oxidative consumption in an oxidizing atmosphere.
これは、黒鉛電極材の気孔に電解液が浸み込みこれが気
孔中で局部的に電解作用を営み、そのため気孔の周囲の
黒鉛が酸化消耗し同時に黒鉛粒子の結合がゆるめられて
崩壊してしまうためてある。This is because the electrolytic solution permeates into the pores of the graphite electrode material and locally electrolyzes the pores, causing the graphite around the pores to be oxidized and consumed, and at the same time, the bonds between the graphite particles are loosened and they collapse. I have saved up.
上記問題点を解決せんがため、気孔を有しない黒鉛材料
を用いれば良いが現在の黒鉛材料の製法においては気孔
を５％以下に押えることは極めて困難であり、一般には
タールピッチ等を真空含浸または浸漬させた後９００℃
前後の雰囲気で焼成し気孔の目詰めを実施しているが十
分な効果が得られなかった。In order to solve the above problems, it is possible to use a graphite material that does not have pores, but with the current manufacturing method of graphite materials, it is extremely difficult to suppress the porosity to less than 5%, and in general, vacuum impregnation with tar pitch, etc. is used. Or 900℃ after soaking
Although we tried to close the pores by firing in different atmospheres, we were not able to obtain a sufficient effect.
従って、高密度で均質な表面層を有する黒鉛電極を得る
には電極を機械加工した後処理に頼らざるを得ないのが
現状である。Therefore, in order to obtain a graphite electrode having a high density and homogeneous surface layer, it is currently necessary to rely on post-processing after machining the electrode.
即ち本発明は叙上の欠点に鑑みてなされたものであり、
炭化水素系ガスを高温熱分解し黒鉛電鉛電極表面に炭素
の堆積層を形成させることを目的としたものである。That is, the present invention has been made in view of the above-mentioned drawbacks,
The purpose is to pyrolyze hydrocarbon gas at high temperature and form a carbon deposit layer on the surface of the graphite electrode.
本発明の実施例を第１図乃至第４図に基き以下説明する
。Embodiments of the present invention will be described below with reference to FIGS. 1 to 4.
第１図は炭素堆積層を形成させる装置の略図であり、反
応室５内には第２図に示すととくの黒鉛ホールダー９に
狭持させた被処理黒鉛電極８が入って居り、反応室５の
外周部に設置した高周波コイル６に３ｋＶ、０．５ＫＡ
の条件で通電すると反応室５内の被処理黒鉛電極８が誘
導加熱されて赤熱状態になる。FIG. 1 is a schematic diagram of an apparatus for forming a carbon deposit layer, and a reaction chamber 5 contains a graphite electrode 8 to be treated sandwiched between graphite holders 9 shown in FIG. 3kV, 0.5KA to the high frequency coil 6 installed on the outer periphery of
When electricity is applied under these conditions, the graphite electrode 8 to be treated in the reaction chamber 5 is heated by induction and becomes red hot.
この状態のもとにおいて、密封カン１の中にシクロルエ
チレン（Ｃ２Ｈ２Ｃｌ２）３を入れ、吸き込み管２より
キャリアガスとしてＮ２ガスを９０ＶＯｌ％ ６００ｍ
ｌ／ｍｉｎの条件で吸き込み、密封カン１内にて発生し
たガスを反応ガス吸き込み管４より反応室５へ送り込む
。Under this condition, cycloethylene (C2H2Cl2) 3 was put into the sealed can 1, and N2 gas was added as a carrier gas through the suction pipe 2 at 90 vol% 600 m
The gas generated in the sealed can 1 is fed into the reaction chamber 5 through the reaction gas suction pipe 4.
即ち被処理黒鉛電極８が赤熱状態となったときにガスが
進入してくると最も高混な被処理黒鉛電極８近辺で分解
し被処理黒鉛電極８表面に炭素の均質層が堆積する。That is, when the graphite electrode 8 to be treated is in a red-hot state and gas enters, it decomposes near the graphite electrode 8 where the gas is most contaminated, and a homogeneous layer of carbon is deposited on the surface of the graphite electrode 8 to be treated.
そして、第３図に示すごとく８００℃１時間保持後の黒
鉛材１１の表面にば、５０乃至１００μｍの炭素の均質
堆積層１０が得られる。As shown in FIG. 3, a homogeneous deposited layer 10 of carbon with a thickness of 50 to 100 μm is obtained on the surface of the graphite material 11 after being held at 800° C. for 1 hour.
尚原料ガスは、メタン、ベンゼン等の炭化水素系ガスで
あれば上記実施例と同様な堆積を施すものである。If the raw material gas is a hydrocarbon gas such as methane or benzene, the same deposition as in the above embodiment is performed.
第４図は本発明の実施例による電極と従来使用の黒鉛電
極の酸化消耗による重量減少を比較したものである。FIG. 4 compares the weight loss due to oxidative consumption between the electrode according to the embodiment of the present invention and the conventionally used graphite electrode.
従って、本発明の構成による電極は極めて耐酸化消耗性
に秀れ従来の電極材との比較において５倍の寿命を有す
るものとなった。Therefore, the electrode constructed according to the present invention has excellent oxidative wear resistance and has a lifespan five times longer than that of conventional electrode materials.
尚試験条件は電流密度１５０Ａ／ｄｍ２、塩濃度３５ｇ
／ｋｇである。The test conditions were a current density of 150 A/dm2 and a salt concentration of 35 g.
/kg.
電極材の物性は表１に示す通りであり、本発明による電
極材は従来の黒鉛電極材に炭素を堆積させたもので基本
物性は同一である。The physical properties of the electrode material are as shown in Table 1, and the electrode material according to the present invention is obtained by depositing carbon on the conventional graphite electrode material and has the same basic physical properties.
第１図は本発明の実施例を示す装置略図、第２図は本発
明の実施例を示す斜視図、第３図は本発明の実施例を示
す断面図、第４図は本発明の重量減少比較実験結果。
符号の説明、１・・・・・・密封カン、２・・・・・・
Ｎ２ガス吹き込み管、３・・・・・・シクロルエチレン
、４・・・・・・反応ガス吹き込み管、５・・・・・・
反応室、６・・・・・・高周波コイル、７・・・・・・
残ガス出口、８・・・・・・被処理黒鉛電極、９・・・
・・・黒鉛ホールダー、１０・・・・・・炭素堆積層、
１１・・・・・・黒鉛電極材。Fig. 1 is a schematic diagram of an apparatus showing an embodiment of the present invention, Fig. 2 is a perspective view showing an embodiment of the invention, Fig. 3 is a sectional view showing an embodiment of the invention, and Fig. 4 is a weight diagram of the invention. Decrease comparison experimental results. Explanation of symbols, 1... Sealed ring, 2...
N2 gas blowing pipe, 3... cycloethylene, 4... Reaction gas blowing pipe, 5...
Reaction chamber, 6...High frequency coil, 7...
Residual gas outlet, 8... graphite electrode to be treated, 9...
... graphite holder, 10 ... carbon deposit layer,
11...Graphite electrode material.
Claims (1)
分解して得た炭素堆積層によって被覆してなることを特
徴とする電解酸化または電解還元用黒鉛電極。1. A graphite electrode for electrolytic oxidation or electrolytic reduction, characterized in that a part or the entire surface of the graphite electrode is coated with a carbon deposit layer obtained by high-temperature decomposition of hydrocarbon gas.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP55061179A JPS586787B2 (en) | 1980-05-07 | 1980-05-07 | graphite electrode |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP55061179A JPS586787B2 (en) | 1980-05-07 | 1980-05-07 | graphite electrode |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS56156785A JPS56156785A (en) | 1981-12-03 |
| JPS586787B2 true JPS586787B2 (en) | 1983-02-07 |
Family
ID=13163667
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP55061179A Expired JPS586787B2 (en) | 1980-05-07 | 1980-05-07 | graphite electrode |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS586787B2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2783927B2 (en) * | 1991-11-29 | 1998-08-06 | 三菱鉛筆株式会社 | Carbon material for electrode and method for producing the same |
-
1980
- 1980-05-07 JP JP55061179A patent/JPS586787B2/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| JPS56156785A (en) | 1981-12-03 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US3432336A (en) | Impregnation of graphite with refractory carbides | |
| US3077507A (en) | Fuel cell electrode | |
| US2392682A (en) | Process for decreasing the permeability of fabricated carbon shapes | |
| CN105923629B (en) | The method that dipping recrystallization carbonization biomass prepares the compound Heteroatom doping porous carbon materials of transition metal | |
| JPS5921658B2 (en) | conductive carbon composite | |
| CN106673655A (en) | Preparation method of self-supporting thin film of graphene enhanced three-dimensional porous carbon | |
| JPS596388A (en) | Manufacture of electrode activated with tungsten carbide | |
| US4137373A (en) | Platinum catalyst and method for making | |
| JPS586787B2 (en) | graphite electrode | |
| US2762724A (en) | Insulated porous aluminum strip | |
| US3167449A (en) | Method of forming carbon coating | |
| FI56981C (en) | ELECTROCHEMICAL PROCESSER AND FOUNDATION FOER DESS FRAMSTAELLNING | |
| US3695869A (en) | Methods of preparing fibrous metal materials and to materials prepared thereby | |
| US4241104A (en) | Process for bonding carbon substrates using particles of a thermally stable solid | |
| JPS6140459B2 (en) | ||
| US1893286A (en) | Method of carbonizing metals and alloys | |
| Shao et al. | Fabrication of a Robust Tantalum Nitride Photoanode from a Flame‐Heating‐Derived Compact Oxide Film | |
| JPH09142819A (en) | Carbon tube enveloping different substance and its production | |
| JPS6139398B2 (en) | ||
| US3462522A (en) | Deposition of pyrolytic material | |
| JP2012111647A (en) | Porous body and method for producing the same | |
| CA1150231A (en) | Process for electrode fabrication having a uniformly distributed catalyst layer upon a porous substrate | |
| JPS61119716A (en) | Carbon fiber having large surface area, production thereof, and catalyst carrier made of said carbon fiber | |
| US378258A (en) | Theodore mace | |
| JPH05285735A (en) | Graphite electrode for electro-chemical machining |