JPH02226614A - High temperature electric insulating material and manufacture thereof - Google Patents
High temperature electric insulating material and manufacture thereofInfo
- Publication number
- JPH02226614A JPH02226614A JP4433389A JP4433389A JPH02226614A JP H02226614 A JPH02226614 A JP H02226614A JP 4433389 A JP4433389 A JP 4433389A JP 4433389 A JP4433389 A JP 4433389A JP H02226614 A JPH02226614 A JP H02226614A
- Authority
- JP
- Japan
- Prior art keywords
- temperature
- alumina
- silica
- insulating material
- heat
- 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.)
- Pending
Links
- 239000011810 insulating material Substances 0.000 title claims abstract description 40
- 238000004519 manufacturing process Methods 0.000 title claims description 7
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims abstract description 51
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims abstract description 46
- 239000000377 silicon dioxide Substances 0.000 claims abstract description 23
- 239000011230 binding agent Substances 0.000 claims abstract description 21
- 239000004927 clay Substances 0.000 claims abstract description 15
- 239000000463 material Substances 0.000 claims abstract description 12
- 238000010438 heat treatment Methods 0.000 claims abstract description 11
- 239000002002 slurry Substances 0.000 claims abstract description 8
- 239000000919 ceramic Substances 0.000 claims description 18
- 239000000835 fiber Substances 0.000 claims description 18
- 238000007666 vacuum forming Methods 0.000 claims description 7
- 238000004898 kneading Methods 0.000 claims description 4
- 230000005611 electricity Effects 0.000 claims description 2
- 239000000203 mixture Substances 0.000 abstract description 3
- 238000010292 electrical insulation Methods 0.000 description 17
- 239000012772 electrical insulation material Substances 0.000 description 5
- 230000000694 effects Effects 0.000 description 4
- RMAQACBXLXPBSY-UHFFFAOYSA-N silicic acid Chemical compound O[Si](O)(O)O RMAQACBXLXPBSY-UHFFFAOYSA-N 0.000 description 4
- 230000005856 abnormality Effects 0.000 description 2
- 230000000052 comparative effect Effects 0.000 description 1
- 238000005485 electric heating Methods 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 239000000395 magnesium oxide Substances 0.000 description 1
- CPLXHLVBOLITMK-UHFFFAOYSA-N magnesium oxide Inorganic materials [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 description 1
- AXZKOIWUVFPNLO-UHFFFAOYSA-N magnesium;oxygen(2-) Chemical compound [O-2].[Mg+2] AXZKOIWUVFPNLO-UHFFFAOYSA-N 0.000 description 1
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 description 1
- 238000005245 sintering Methods 0.000 description 1
Landscapes
- Inorganic Insulating Materials (AREA)
Abstract
Description
【発明の詳細な説明】
産業上の利用分野
本発明は一般家庭において使用される電気ユニットや工
業用として使用される電気炉などに用いられる高温電気
絶縁材料に関するものである。DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to high-temperature electrical insulating materials used in electrical units used in general households, electric furnaces used in industry, and the like.
従来の技術
従来より高温電気絶縁材料としては、シーズヒータなど
に用いられる酸化マグネシウムや酸化アルミニウムなど
がよく知られている。BACKGROUND OF THE INVENTION Magnesium oxide, aluminum oxide, and the like, which are used in sheathed heaters, are well known as high-temperature electrical insulating materials.
一方、電熱ユニットや電気炉において、コイル状の電熱
線や棒状の炭化ナイ素などの発熱体を保持または絶縁す
る高温絶縁材料として陶器やシリカまたはアルミナを主
成分とするセラミックファイバーからなる断熱材が主に
用いられている。On the other hand, in electric heating units and electric furnaces, heat insulating materials made of ceramic fibers mainly composed of ceramic, silica, or alumina are used as high-temperature insulating materials to hold or insulate heating elements such as coiled heating wires and rod-shaped nitric carbide. Mainly used.
特にシリカまたはアルミナを主成分とする断熱材は、断
熱効果もあり、最近ではよく用いられるようになって来
ている。In particular, heat insulating materials mainly composed of silica or alumina have a heat insulating effect and have recently become popular.
発明が解決しようとする課題
しかしながら高温電気絶縁材料として、シリカまたはア
ルミナを主成分とするセラミックファイバーからなる断
熱材を用いると、耐熱性に優れるため高温で使用しても
実使用上大きな問題はないが、多湿雰囲気中に放置され
ると、電気絶縁特性が著しく低下し、問題があった。Problems to be Solved by the Invention However, if a heat insulating material made of ceramic fibers containing silica or alumina as a main component is used as a high-temperature electrical insulating material, it has excellent heat resistance, so there is no problem in practical use even when used at high temperatures. However, when left in a humid atmosphere, the electrical insulation properties deteriorate significantly, creating a problem.
これは断熱材の結合材として、吸湿性の著しいシリカゾ
ルを使用するためであると言われている。This is said to be due to the use of highly hygroscopic silica sol as a binding material for the heat insulating material.
また、このような断熱材を高温電気絶縁材料として用い
た場合の他の問題として、振動、落下などの機械的強度
が比較的弱いということがある。Another problem when such a heat insulating material is used as a high-temperature electrical insulating material is that its mechanical strength against vibrations, drops, etc. is relatively weak.
このため、特定の条件下でのみ用いられていた。For this reason, it was only used under certain conditions.
本発明は前述した課題を解決する。The present invention solves the problems mentioned above.
（１）多湿雰囲気中に放置されても電気絶縁特性が優れ
る、
（２） （１）の特性を有すると共に機械的強度にお
いても浸れる、
などの特性の高温電気絶縁材料と製造方法を提供しよう
とするものである。We would like to provide a high-temperature electrical insulating material and manufacturing method that has the following properties: (1) It has excellent electrical insulation properties even when left in a humid atmosphere; (2) It has the properties described in (1) and can also be immersed in mechanical strength. That is.
課題を解決するための手段
本発明はシリカまたはアルミナ、またはシリカとアルミ
ナの混合組成分を主成分とするセラミックファイバーを
、（１）アルミナゾルを主たる結合材とし、（２）アル
ミナゾルと粘土を主たる結合材とし、それぞれ所要形状
に真空成型したのち６００℃以上の温度で熱処理した高
温電気絶縁材料であり、シリカ、アルミナまたはシリカ
とアルミナの混合組成物に結合材として（１）アルミナ
ゾルまたは（２）アルミナゾルと粘土を添加し、スラリ
ー状に混煉した後、所定形状に真空成型し６００℃以上
の温度で熱処理する製造方法である。Means for Solving the Problems The present invention uses ceramic fibers mainly composed of silica, alumina, or a mixed composition of silica and alumina, (1) using alumina sol as the main binding material, and (2) using alumina sol and clay as the main binding material. It is a high-temperature electrical insulating material that is vacuum-formed into the desired shape and then heat-treated at a temperature of 600°C or higher. Silica, alumina, or a mixed composition of silica and alumina is combined with (1) alumina sol or (2) alumina sol as a binder. This is a production method in which clay is added and kneaded into a slurry, which is then vacuum-formed into a predetermined shape and heat-treated at a temperature of 600°C or higher.
作用
本発明では、多湿雰囲気中の電気絶縁特性を高めるため
に結合材として、吸湿性の極めて少ないアルミナゾルを
使用すると共に、このアルミナゾルを安定化させるため
に６００℃以上の高温で熱処理したものである。Function: In the present invention, an alumina sol with extremely low hygroscopicity is used as a binding material in order to improve electrical insulation properties in a humid atmosphere, and the alumina sol is heat-treated at a high temperature of 600°C or higher to stabilize it. .
また、多湿雰囲気中の電気絶縁特性および機械的強度を
高めるためにアルミナゾルに加えて粘土を結合材として
用いることにより粘土の結合力の強さにより機械的強度
を高めたものである。Furthermore, in order to enhance the electrical insulation properties and mechanical strength in a humid atmosphere, clay is used as a binding material in addition to alumina sol, thereby increasing the mechanical strength due to the strong binding force of the clay.
このような理由により多湿雰囲気中に放置されても浸れ
た電気絶縁特性を、また浸れた電気絶縁特性および機械
的強度を示す高温電気絶縁材料が可能となる。For this reason, high-temperature electrical insulating materials are possible that exhibit excellent electrical insulation properties even when left in a humid atmosphere, and also exhibit excellent electrical insulation properties and mechanical strength.
実施例 本発明を具体的な実施例について説明する。Example The present invention will be described with reference to specific examples.
実施例１ シリカおよびアルミナ（５０１５０）（重量％を示す。Example 1 Silica and alumina (50150) (% by weight shown).
）を主成分とするセラミックファイバーに結合材として
アルミナゾルを重量％で１０％以下に添加し、スラリー
状に混煉した後ψ２００Ｘｔ＝１０ の形状に真空成型
し、高温電気絶縁材料を準備した。) was added with alumina sol as a binder in an amount of 10% by weight or less as a binder, kneaded into a slurry, and then vacuum formed into a shape of ψ200Xt=10 to prepare a high-temperature electrical insulating material.
これを２００℃〜１２００℃の温度で熱処理し試料番号
１１〜２１の各種高温電気絶縁材料を作成した。This was heat-treated at a temperature of 200° C. to 1200° C. to create various high-temperature electrical insulating materials of sample numbers 11 to 21.
一方、比較の奔め結合材としてシリカゾルを用い、同様
にして真空成型すると共に熱処理し、試料番号１〜ｌＯ
の高温電気絶縁材料を作成した。On the other hand, using silica sol as a comparative bonding material, vacuum forming and heat treatment were performed in the same manner, sample numbers 1 to 1O
created a high-temperature electrical insulation material.
このようＫして準備した各種高温電気絶縁材料を評価す
るため４０℃、相対湿度９５％の多湿雰囲気中に７日間
投入し、この後に電気絶縁抵抗を測定した。In order to evaluate the various high-temperature electrical insulating materials prepared in this way, they were placed in a humid atmosphere at 40° C. and 95% relative humidity for 7 days, and then their electrical insulation resistance was measured.
なお、電気絶縁抵抗は高温電気絶縁材料を２枚の導電板
でサンドイッチにし、この間の絶縁抵抗を測定した。The electrical insulation resistance was measured by sandwiching a high-temperature electrical insulating material between two conductive plates and measuring the insulation resistance between them.
この結果を第１表に示した。The results are shown in Table 1.
第１表から明らかなように、結合材としてシリカゾルを
用いた試料番号１〜１０の従来の高温電気絶縁材料では
、熱処理温度にかかわらずいずれも１．０ ＭΩ以下で
あり、低い電気絶縁抵抗であった。As is clear from Table 1, the conventional high-temperature electrical insulating materials of sample numbers 1 to 10 using silica sol as a binder have low electrical insulation resistances of 1.0 MΩ or less regardless of the heat treatment temperature. there were.
また、結合材としてアルミナゾルを用い６００℃以下で
熱処理した試料番号１１〜１４の高温電気絶縁材料は、
従来のシリカゾルを結合材としたものに比較してＩＭΩ
とかなり高い値を示すものの１０ＭΩ以下であり、実用
レベルとしてはまだ低い値であった。In addition, the high-temperature electrical insulating materials of sample numbers 11 to 14, which were heat-treated at 600°C or less using alumina sol as a binding material,
IMΩ compared to conventional silica sol binding material
Although this value was quite high, it was less than 10 MΩ, which was still a low value for practical use.
これに対し、６００℃以上で熱処理した試料番号１５〜
２１の本発明の高温電気絶縁材料は１０ＭΩ以上の非常
に高い値を示し、実用上問題のないレベルとなった。On the other hand, sample number 15~ which was heat-treated at 600℃ or higher
No. 21 high-temperature electrical insulating material of the present invention showed a very high value of 10 MΩ or more, which was at a level that caused no practical problems.
このようにアルミナゾルを結合材として６００℃以上で
熱処理した断熱材は優れた高温電気絶縁材料として使用
することができる。A heat insulating material heat-treated at 600° C. or higher using alumina sol as a binder can be used as an excellent high-temperature electrical insulating material.
なお、熱処理温度としては１０００℃を越えると断熱材
の焼結が進行し、収縮度が高まり、機械的強度が低下す
るなど別の問題が生じて来るのでｔｏｏｏ℃以下に抑え
るのがよい。It should be noted that if the heat treatment temperature exceeds 1000°C, sintering of the heat insulating material will progress, the degree of shrinkage will increase, mechanical strength will decrease, and other problems will occur, so it is better to keep it below 1000°C.
実施例２
シリカおよびアルミナ（５０１５０）を主成分とするセ
ラミックファイバーに結合材としてアルミナゾルおよび
粘土それぞれ重量％で１０％以下を添加し、スラリー状
に混錬したあと実施例１と同様にψ２００Ｘｔ＝ｌＯの
形状に真空成型し、高温電気絶縁材料を準備した。Example 2 10% or less by weight of each of alumina sol and clay were added as binders to ceramic fibers mainly composed of silica and alumina (50150), and after kneading them into a slurry, ψ200Xt=lO as in Example 1. The material was vacuum formed into the shape of , and a high-temperature electrical insulating material was prepared.
これを２００℃〜１２００℃の温度で熱処理し試料番号
２２〜３２の各種高温電気絶縁材料２作成した。This was heat-treated at a temperature of 200° C. to 1200° C. to produce various high-temperature electrical insulating materials 2 of sample numbers 22 to 32.
このように準備した各種高温電気絶縁材料および実施例
１で作成した試料番号１１〜２１の各種高温電気絶縁材
料について、実施例１で行なった多湿雰に気中における
電気絶縁抵抗を測定すると共に、機械的強度の評価を行
ない、結果を第２表に示した。Regarding the various high-temperature electrical insulating materials prepared in this way and the various high-temperature electrical insulating materials of sample numbers 11 to 21 created in Example 1, the electrical insulation resistance in a humid atmosphere was measured as in Example 1, and Mechanical strength was evaluated and the results are shown in Table 2.
なお、機械的強度については８０ｃｒｎの高さより水平
に落下させ、破損する場合をｘ印で、まったく異常のな
い場合をＯ印で、また破損にまで至らないが変形など異
常が見られる場合をΔ印で示した。Regarding mechanical strength, when dropped horizontally from a height of 80 crn, the case where damage occurs is marked x, the case where there is no abnormality at all is marked O, and the case where abnormality such as deformation is observed although not broken is marked Δ. Indicated with a mark.
し−一〉シ’ｐ−ノ
第会２
表
第２表から明らかなように、結合材としてアルミナゾル
を用いた試料番号１１〜２１の高温電気絶縁材料は、多
湿雰囲気中において高い電気絶縁抵抗を示すが、機械的
強度において、Δ〜×となんもの問題を生じ、使用環境
が極めて限定された条件下でしか使用することができな
い。As is clear from Table 2, the high-temperature electrical insulating materials of sample numbers 11 to 21 using alumina sol as a binder have high electrical insulation resistance in a humid atmosphere. However, it causes some problems in terms of mechanical strength, ranging from Δ to ×, and can only be used under extremely limited usage environments.
特に、この機械的強度は、熱処理温度が高くなるほど低
くなる傾向にあり、多湿雰囲気中における電気絶縁抵抗
と逆の傾向にあり、実使用上、都合の悪いものであった
。In particular, this mechanical strength tends to decrease as the heat treatment temperature increases, and has a tendency opposite to the electrical insulation resistance in a humid atmosphere, which is inconvenient for practical use.
一方、これに対して結合材としてアルミナゾルと粘土を
用いた試料番号２２〜３２の高温電気絶縁材料は、従来
のアルミナシ、ルのみを結合材としたものに比較的に多
湿雰囲気中における電気絶縁抵抗は高い値を示すと共に
、なによりも機械的強度において優れた特性を示した。On the other hand, the high-temperature electrical insulation materials of sample numbers 22 to 32 using alumina sol and clay as binders have a higher electrical insulation resistance in a relatively humid atmosphere than those using only alumina sol and clay as binders. In addition to showing a high value, it also showed excellent properties in terms of mechanical strength above all.
特に、６００℃〜１０００℃で熱処理した試料番号２６
〜３０の高温電気絶縁材料は、高い電気絶縁抵抗および
機械的強度を示し、優れた高温電気絶縁材料として使用
することができる。In particular, sample number 26 heat-treated at 600°C to 1000°C.
~30 high temperature electrical insulation materials exhibit high electrical insulation resistance and mechanical strength, and can be used as excellent high temperature electrical insulation materials.
なお、熱処理温度と機械的強度については実施例１で述
べた傾向が同様に見られ、ｔｏｏｏ℃以下に抑えるのが
望ましい。Regarding the heat treatment temperature and mechanical strength, the same tendency as described in Example 1 can be seen, and it is desirable to suppress the heat treatment temperature to below 100°C.
以上実施例１および２で示したように、結合材としてア
ルミナゾルを用い、６００℃以上の温度で熱処理するこ
とにより多湿雰囲気中における電気絶縁抵抗を高めるこ
とが出来る。As shown in Examples 1 and 2 above, electrical insulation resistance in a humid atmosphere can be increased by using alumina sol as a binding material and heat-treating at a temperature of 600° C. or higher.
また、このようにして得られる高温電気絶縁材料は、−
船釣には機械的強度が弱く、特定の条件下でしか応用す
ることが出来ないが、このアルミナゾルに結合材として
粘土を加えることによりＩれた電気絶縁抵抗を有したま
ま機械的強度を高めることができ、幅広い用途において
実使用が可能となる。Moreover, the high temperature electrical insulating material obtained in this way is -
For boat fishing, the mechanical strength is weak and it can only be applied under certain conditions, but by adding clay as a binder to this alumina sol, the mechanical strength is increased while maintaining the electrical insulation resistance. This enables practical use in a wide range of applications.
なお、本発明の実施例において、セラミックファイバー
としてシリカおよびアルミナの成分が５０１５０のもの
について述べたが、特にこれに限定されるものではなく
、他の配合比のセラミックファイバーや、異なる組成の
たとえばジルコニアファイバーなどのセラミックファイ
バーにおいても同様の効果が得られる。In the examples of the present invention, ceramic fibers containing 50150 silica and alumina have been described, but the invention is not limited to this. Similar effects can be obtained with ceramic fibers such as fibers.
シリカまたはアルミナ単体のセラミックファイバーであ
っても同様の作用効果を生ずる。Similar effects can be obtained even if the ceramic fiber is made of silica or alumina alone.
発明の効果
本発明によれば、シリカまたはアルミナを主成分とする
セラミックファイバーをアルミナゾルを主たる結合材と
し真空成型したのち６００℃以上の温度で熱処理するこ
とにより、多湿雰囲気中に放置されても電気絶縁特性に
浸れた高温電気絶縁材料を提供することができる。Effects of the Invention According to the present invention, ceramic fibers mainly composed of silica or alumina are vacuum-formed using alumina sol as the main binder, and then heat-treated at a temperature of 600°C or higher, so that electricity can be maintained even when left in a humid atmosphere. A high temperature electrical insulation material steeped in insulating properties can be provided.
また、シリカまたはアルミナゾルを主成分とするセラミ
ックファイバーをアルミナゾルおよび粘土を主たる結合
材とし、真空成型したのち６００℃以上の温度で熱処理
することにより多湿雰囲気中に放置されても電気絶縁特
性に浸れると共に、機械的強度に浸れた高温電気絶縁材
料を提供することが出来る。In addition, ceramic fibers containing silica or alumina sol as the main components are vacuum formed using alumina sol and clay as the main binders, and then heat treated at a temperature of 600°C or higher, so that they retain their electrical insulation properties even when left in a humid atmosphere. At the same time, it is possible to provide a high temperature electrical insulating material with high mechanical strength.
Claims (8)
ァイバーをアルミナゾルを結合材とし所要形状に真空成
型し６００℃以上の温度で加熱処理してなることを特徴
とする高温電気絶縁材料。1. A high-temperature electrical insulating material characterized by being made by vacuum forming ceramic fibers containing silica or alumina as a main component into a desired shape using alumina sol as a binder, and then heat-treated at a temperature of 600°C or higher.
ァイバーに結合材としてアルミナゾルを添加し、スラリ
ー状に混煉した後、所要形状に真空成型し６００℃以上
の温度で熱処理することを特徴とする高温電気絶縁材料
の製造方法。2. A high-temperature electrical insulating material characterized by adding alumina sol as a binder to ceramic fibers mainly composed of silica or alumina, kneading them into a slurry, vacuum forming them into the desired shape, and heat-treating them at a temperature of 600°C or higher. manufacturing method.
バーをアルミナゾルを結合材とし薄板状に真空成型し、
６００℃以上の温度で加熱処理してなることを特徴とす
る高温電気絶縁材料。3. Ceramic fibers mainly composed of silica and alumina are vacuum formed into thin plates using alumina sol as a binding material.
A high-temperature electrical insulating material characterized by being heat-treated at a temperature of 600°C or higher.
バーに結合材としてアルミナゾルを添加し、スラリー状
に混煉した後、薄板状に真空成型し６００℃以上の温度
で熱処理することを特徴とする高温電気絶縁材料の製造
方法。4. A high-temperature electrical insulating material characterized by adding alumina sol as a binder to ceramic fibers mainly composed of silica and alumina, kneading them into a slurry, vacuum forming them into thin plates, and heat-treating them at temperatures of 600°C or higher. manufacturing method.
ァイバーをアルミナゾルおよび粘土を結合材とし、所要
形状に真空成型し６００℃以上の温度で加熱処理してな
ることを特徴とする高温電気絶縁材料。5. A high-temperature electrical insulating material characterized in that it is made by vacuum forming ceramic fibers containing silica or alumina as a main component, using alumina sol and clay as binders, into a desired shape, and heat-treating them at a temperature of 600°C or higher.
ァイバーに結合材としてアルミナゾルおよび粘土を添加
し、スラリー状に混煉した後、所要形状に真空成型し６
００℃以上の温度で加熱処理することを特徴とする高温
電気絶縁材料の製造方法。6. Alumina sol and clay are added as binders to ceramic fibers mainly composed of silica or alumina, mixed into a slurry, and then vacuum formed into the desired shape.
1. A method for producing a high-temperature electrical insulating material, characterized by heat treatment at a temperature of 00° C. or higher.
バーをアルミナゾルおよび粘土を結合材とし、所要形状
に真空成型し６００℃以上の温度で熱処理してなる高温
電気絶縁材料。7. A high-temperature electrical insulating material made by vacuum forming ceramic fibers whose main components are silica and alumina using alumina sol and clay as binders into the desired shape and heat-treating them at temperatures of 600°C or higher.
バーに結合材としてアルミナゾルと粘土を添加し、スラ
リー状に混煉した後、所要形状に真空成型し６００℃以
上の温度で熱処理することを特徴とする高温電気絶縁材
料の製造方法。8. High-temperature electricity is characterized by adding alumina sol and clay as binders to ceramic fibers mainly composed of silica and alumina, kneading them into a slurry, vacuum forming them into the desired shape, and heat-treating them at a temperature of 600°C or higher. Method of manufacturing insulating materials.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4433389A JPH02226614A (en) | 1989-02-26 | 1989-02-26 | High temperature electric insulating material and manufacture thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4433389A JPH02226614A (en) | 1989-02-26 | 1989-02-26 | High temperature electric insulating material and manufacture thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH02226614A true JPH02226614A (en) | 1990-09-10 |
Family
ID=12688589
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP4433389A Pending JPH02226614A (en) | 1989-02-26 | 1989-02-26 | High temperature electric insulating material and manufacture thereof |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH02226614A (en) |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH02210711A (en) * | 1989-02-09 | 1990-08-22 | Nippon Steel Chem Co Ltd | Manufacture of thermal resistant electrical insulating material |
-
1989
- 1989-02-26 JP JP4433389A patent/JPH02226614A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH02210711A (en) * | 1989-02-09 | 1990-08-22 | Nippon Steel Chem Co Ltd | Manufacture of thermal resistant electrical insulating material |
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