JPS63224303A - Manufacture of zinc oxide varistor - Google Patents
Manufacture of zinc oxide varistorInfo
- Publication number
- JPS63224303A JPS63224303A JP62057988A JP5798887A JPS63224303A JP S63224303 A JPS63224303 A JP S63224303A JP 62057988 A JP62057988 A JP 62057988A JP 5798887 A JP5798887 A JP 5798887A JP S63224303 A JPS63224303 A JP S63224303A
- Authority
- JP
- Japan
- Prior art keywords
- zinc oxide
- varistor
- aqueous solution
- oxide varistor
- value
- 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.)
- Granted
Links
- XLOMVQKBTHCTTD-UHFFFAOYSA-N Zinc monoxide Chemical compound [Zn]=O XLOMVQKBTHCTTD-UHFFFAOYSA-N 0.000 title claims description 22
- 239000011787 zinc oxide Substances 0.000 title claims description 11
- 238000004519 manufacturing process Methods 0.000 title claims description 9
- 238000000034 method Methods 0.000 claims description 13
- 239000007864 aqueous solution Substances 0.000 claims description 11
- 150000001412 amines Chemical class 0.000 claims description 8
- 239000002244 precipitate Substances 0.000 claims description 7
- 238000005245 sintering Methods 0.000 claims description 5
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 4
- 239000003795 chemical substances by application Substances 0.000 claims description 4
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 3
- 229910052797 bismuth Inorganic materials 0.000 claims description 3
- JCXGWMGPZLAOME-UHFFFAOYSA-N bismuth atom Chemical compound [Bi] JCXGWMGPZLAOME-UHFFFAOYSA-N 0.000 claims description 3
- 239000011651 chromium Substances 0.000 claims description 3
- 239000001301 oxygen Substances 0.000 claims description 3
- 229910052760 oxygen Inorganic materials 0.000 claims description 3
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 claims description 2
- 229910052787 antimony Inorganic materials 0.000 claims description 2
- WATWJIUSRGPENY-UHFFFAOYSA-N antimony atom Chemical compound [Sb] WATWJIUSRGPENY-UHFFFAOYSA-N 0.000 claims description 2
- 229910052804 chromium Inorganic materials 0.000 claims description 2
- 229910017052 cobalt Inorganic materials 0.000 claims description 2
- 239000010941 cobalt Substances 0.000 claims description 2
- GUTLYIVDDKVIGB-UHFFFAOYSA-N cobalt atom Chemical compound [Co] GUTLYIVDDKVIGB-UHFFFAOYSA-N 0.000 claims description 2
- WPBNNNQJVZRUHP-UHFFFAOYSA-L manganese(2+);methyl n-[[2-(methoxycarbonylcarbamothioylamino)phenyl]carbamothioyl]carbamate;n-[2-(sulfidocarbothioylamino)ethyl]carbamodithioate Chemical compound [Mn+2].[S-]C(=S)NCCNC([S-])=S.COC(=O)NC(=S)NC1=CC=CC=C1NC(=S)NC(=O)OC WPBNNNQJVZRUHP-UHFFFAOYSA-L 0.000 claims description 2
- -1 praseodium Chemical compound 0.000 claims description 2
- 239000000047 product Substances 0.000 claims description 2
- 150000003839 salts Chemical class 0.000 claims description 2
- 239000000377 silicon dioxide Substances 0.000 claims description 2
- 150000003751 zinc Chemical class 0.000 claims description 2
- 239000000843 powder Substances 0.000 description 14
- 238000010304 firing Methods 0.000 description 8
- 238000001354 calcination Methods 0.000 description 6
- 239000000470 constituent Substances 0.000 description 5
- HPNMFZURTQLUMO-UHFFFAOYSA-N diethylamine Chemical compound CCNCC HPNMFZURTQLUMO-UHFFFAOYSA-N 0.000 description 4
- 238000002156 mixing Methods 0.000 description 4
- XSQUKJJJFZCRTK-UHFFFAOYSA-N Urea Chemical compound NC(N)=O XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 description 3
- 239000004202 carbamide Substances 0.000 description 3
- 238000007796 conventional method Methods 0.000 description 3
- 238000010438 heat treatment Methods 0.000 description 3
- 229910052751 metal Inorganic materials 0.000 description 3
- 239000002184 metal Substances 0.000 description 3
- ROSDSFDQCJNGOL-UHFFFAOYSA-N Dimethylamine Chemical compound CNC ROSDSFDQCJNGOL-UHFFFAOYSA-N 0.000 description 2
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 description 2
- 229920000877 Melamine resin Polymers 0.000 description 2
- BAVYZALUXZFZLV-UHFFFAOYSA-N Methylamine Chemical compound NC BAVYZALUXZFZLV-UHFFFAOYSA-N 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000007731 hot pressing Methods 0.000 description 2
- JDSHMPZPIAZGSV-UHFFFAOYSA-N melamine Chemical compound NC1=NC(N)=NC(N)=N1 JDSHMPZPIAZGSV-UHFFFAOYSA-N 0.000 description 2
- 238000003980 solgel method Methods 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 238000005406 washing Methods 0.000 description 2
- 239000004129 EU approved improving agent Substances 0.000 description 1
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 1
- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 description 1
- 230000002378 acidificating effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000007872 degassing Methods 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 239000010419 fine particle Substances 0.000 description 1
- 230000002706 hydrostatic effect Effects 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-M hydroxide Chemical compound [OH-] XLYOFNOQVPJJNP-UHFFFAOYSA-M 0.000 description 1
- 150000004679 hydroxides Chemical class 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 239000011572 manganese Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000004570 mortar (masonry) Substances 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 229910017604 nitric acid Inorganic materials 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 238000010298 pulverizing process Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
- 239000011701 zinc Substances 0.000 description 1
Landscapes
- Thermistors And Varistors (AREA)
Abstract
(57)【要約】本公報は電子出願前の出願データであるた
め要約のデータは記録されません。(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.
Description
【発明の詳細な説明】 産業上の利用分野 本発明は酸化亜鉛バリスタの製造方法に関する。[Detailed description of the invention] Industrial applications The present invention relates to a method for manufacturing a zinc oxide varistor.
酸化亜鉛バリスタは電気回路の電圧安定化や電圧サージ
の吸収素子として広く実用化されている。Zinc oxide varistors are widely used as voltage stabilizing elements in electrical circuits and as voltage surge absorbing elements.
従来技術
従来の酸化亜鉛バリスタの製造方法としては、機械的混
合法、ゾル−ゲル法、尿素法等が知られている。Prior Art Conventional methods for producing zinc oxide varistors include a mechanical mixing method, a sol-gel method, and a urea method.
機械的混合法は、構成成分の酸化物を乾式または湿式で
混合し、仮焼・粉砕・加圧成型・本焼成により焼結体を
作製する方法である。バリスタ特性の評価指数として知
られるα値は■＝ｓｃ−ｖ’（Ｉ；電流 Ｖ Ｈ電圧、
に；定数）として知られるが、機械的混合法によるバリ
スタでは、ＺｎＯに数種の金属成分を添加することによ
り、α値が５０以上の焼結体を作製することが可能であ
るが、その焼成温度が１３００℃以上と高く、しかもそ
の温度領域でのαの温度依存性が極端に大きいために再
現性良くα値５０以上を達成することは極めて困難であ
る。The mechanical mixing method is a method in which constituent oxides are mixed dry or wet, and a sintered body is produced by calcination, pulverization, pressure molding, and main firing. The α value known as the evaluation index of varistor characteristics is ■=sc-v'(I; current V H voltage,
In varistors made by mechanical mixing, it is possible to create a sintered body with an α value of 50 or more by adding several metal components to ZnO. Since the firing temperature is as high as 1300° C. or higher, and the temperature dependence of α is extremely large in that temperature range, it is extremely difficult to achieve an α value of 50 or higher with good reproducibility.
ゾールゲル法は、構成元素の水酸化物の混合ゾル溶液を
濃縮し、ゲルを得、該ゲルを、仮焼後、ホットプレスに
より焼結体を作製し、その後、酸素気流中７００−１０
００℃の加熱処理を行うことにより、バリスタを製造す
る方法である。この方法は、ホットプレスと′・それに
続く加熱処理という複雑な工程を必要とし、α値も最高
で４０という低い値であるという欠点を持つ。In the sol-gel method, a mixed sol solution of hydroxides as constituent elements is concentrated to obtain a gel, which is then calcined and hot-pressed to produce a sintered body.
This is a method of manufacturing a varistor by performing heat treatment at 00°C. This method requires complicated steps of hot pressing and subsequent heat treatment, and has the disadvantage that the α value is as low as 40 at most.
尿素法は構成成分の硝酸水溶液に尿素を加え、加熱・濃
縮により、メラミンを合成し、該メラミンを仮焼して得
られた粉末を加圧成型後、１１００〜１２００℃で焼成
、または７５０〜９５０℃でホットプレスすることによ
りバリスタを作製する方法である。In the urea method, urea is added to an aqueous solution of nitric acid as a component, and melamine is synthesized by heating and concentrating.The melamine is calcined, the resulting powder is pressure molded, and then calcined at 1100 to 1200 °C, or 750 to 750 °C. This is a method for producing varistors by hot pressing at 950°C.
この方法で作製したバリスタのα値は２０〜３０の範囲
であり、α値が低いという欠点を有する。The α value of the varistor produced by this method is in the range of 20 to 30, and has the disadvantage of a low α value.
発明の目的
本発明は従来法の欠点を解消するためになされたもので
、その目的はアミン類を沈殿剤として用いることにより
、高い粉末特性を持つ粉末を合成し、これを焼結するこ
とにより、高いα値を持つ酸化亜鉛バリスタを低い温度
で、且つ再現性良く製造する方法を提供するにある。Purpose of the Invention The present invention was made to overcome the drawbacks of conventional methods.The purpose of the present invention is to synthesize a powder with high powder properties by using amines as a precipitant, and to sinter this powder. An object of the present invention is to provide a method for manufacturing a zinc oxide varistor having a high α value at low temperature and with good reproducibility.
発明の構成
本発明者らは、酸化亜鉛バリスタの製造について、鋭意
研究を重ねた結果、アミン類を沈殿剤として用いること
により、高い粉末特性を持つ粉末を合成出来ることを究
明した。これを原料として、焼結を行うと、α値の高い
バリスタが低い温度で作製できること、及びα値の焼成
温度依存性が広い温度範囲で極めて小さい事実が判明し
た。これらの知見に基づき本発明を完成した。Structure of the Invention The present inventors have conducted extensive research into the production of zinc oxide varistors, and as a result have discovered that a powder with high powder characteristics can be synthesized by using amines as a precipitant. It has been found that by sintering this material as a raw material, a varistor with a high α value can be produced at a low temperature, and that the dependence of the α value on firing temperature is extremely small over a wide temperature range. The present invention was completed based on these findings.
本発明の要旨は
亜鉛塩類とバリスタ機能の付与剤または向上剤の１種ま
たは２種以上の塩類との混合水溶液を、アミン類の水溶
液と混合して沈殿物を作り、該沈殿物を洗浄乾燥し、２
００〜７００℃で仮焼した後、粉砕・加圧成型し、該成
型物を空気中または酸素雰囲気中で１１００〜１３００
℃で焼結することを特徴とする酸化亜鉛バリスタの製造
方法、にある。The gist of the present invention is to form a precipitate by mixing an aqueous solution of zinc salts and one or more salts as a varistor function imparting agent or improver with an aqueous solution of amines, and washing and drying the precipitate. 2
After calcining at 00 to 700°C, the molded product is crushed and pressure molded to a temperature of 1100 to 1300°C in air or oxygen atmosphere.
A method for manufacturing a zinc oxide varistor, characterized by sintering at ℃.
バリスタ機能の付与剤または向上剤としては、例えば、
ビスマス、コバルト、マンガン、クロム。Examples of varistor function imparting or improving agents include:
Bismuth, cobalt, manganese, chromium.
アンチモン、プラセオヂウム、シリカ等が挙げられる。Examples include antimony, praseodium, and silica.
しかし、これらに限定されるものではない。However, it is not limited to these.
沈殿剤のアミン類としては、例えばジエチルアミン２エ
チルアミン、メチルアミン、ジメチルアミン等が挙げら
れる。Examples of amines as precipitants include diethylamine, diethylamine, methylamine, and dimethylamine.
沈殿を形成するには、アミン類の水溶液中に構成成分を
含む水溶液を滴下することが一般的には好ましい、また
沈殿形成後の液のｐｉは８〜１０にすることが適当であ
る。液のｐＨが８未満では構成成分の沈殿生成が完結し
なく、ｐＨが１０を超えると仮焼後の粉末特性が悪（な
る。To form a precipitate, it is generally preferable to drop an aqueous solution containing the constituent components into an aqueous solution of amines, and it is appropriate that the pi of the liquid after precipitate formation be 8 to 10. If the pH of the solution is less than 8, precipitation of the constituent components will not be completed, and if the pH exceeds 10, the powder properties after calcination will be poor.
得られた沈殿物を水、アルコールまたはアミン類の水溶
液で洗浄後、乾燥して２００〜７００℃で仮焼する。仮
焼温度が２００℃未満では構成成分の反応や脱ガスが完
結せず、また得られる粉末の嵩密度が低くなる。７００
℃を超えると粉末粒子が粗大化して焼結性が悪くなる。The obtained precipitate is washed with water, alcohol, or an aqueous solution of amines, dried, and calcined at 200 to 700°C. If the calcination temperature is less than 200°C, the reaction of the constituent components and degassing will not be completed, and the bulk density of the resulting powder will be low. 700
If the temperature exceeds .degree. C., the powder particles become coarse and the sinterability deteriorates.
従って、仮焼温度は２０後、空気中または酸素雰囲気中
で焼成する。焼成は８００〜１０００℃まで昇温後、０
〜３時間保持した後、ｔｔｏｏ〜１３００℃まで昇温す
ることが好ましい。Therefore, after the calcination temperature is 20°C, the calcination is performed in air or in an oxygen atmosphere. Firing is performed after raising the temperature to 800-1000℃, and then
After holding for ~3 hours, it is preferable to raise the temperature to ~1300°C.
焼成温度が１１００℃未満では焼結が不十分であり、ま
たα値も低い。１３００℃を超えるとビスマス等のバリ
スタ機能付与剤の飛散が顕著となり、多孔質化し、α値
も低下する。高いα値のものを得るためには焼成温度は
１１００〜１３００℃であることが必要である。If the firing temperature is less than 1100°C, sintering will be insufficient and the α value will also be low. When the temperature exceeds 1300°C, scattering of the varistor function imparting agent such as bismuth becomes noticeable, the film becomes porous, and the α value also decreases. In order to obtain a high α value, the firing temperature needs to be 1100 to 1300°C.
実施例
金属濃度としてＺｎを２０．８ ｇ／ｌ、 Ｂｉを０．
６８５ ｇ／ｌ。Example The metal concentration was 20.8 g/l for Zn and 0.8 g/l for Bi.
685 g/l.
Ｇｏを０．１９３ ｇ／ｌ 、 Ｍｎを０．０９０１
ｇ／ｌ、 Ｃｒを０．１７１ｇ／ｌ。Go 0.193 g/l, Mn 0.0901
g/l, Cr 0.171 g/l.
ｓｂを０．７９７ｇ八を含む塩酸酸性水溶液２６０ ｃ
ｃを調製し、これを攪拌した０、８Ｎジエチルアミン水
溶液１０００ｃｃ中に滴下して水酸化物の共沈物を作っ
た。260 c of hydrochloric acid acidic aqueous solution containing 0.797 g of sb
c was prepared and added dropwise to 1000 cc of a stirred 0.8N diethylamine aqueous solution to form a coprecipitate of hydroxide.
これを０．００１Ｎジエチルアミン水溶液で洗浄後、１
００℃で乾燥し、５００℃で６時間仮焼した。得られた
粉末をＢＵＴにより比表面積を測定したところ、比表面
積３ｈ＋”／ｇの微細な粒子からなっていた。該粉末を
乳鉢で粉砕後、 ２．Ｑ ｔ／ａｍ”の静水圧化で直径
８ｔｍ、厚さ１．５ｆｉに成型し、空気中で９００℃ま
で１時間で昇温し、９００℃で３０分間保持後、最終的
に更に高温（１１００〜１３００℃）で１時間焼成した
。After washing this with 0.001N diethylamine aqueous solution,
It was dried at 00°C and calcined at 500°C for 6 hours. When the specific surface area of the obtained powder was measured by BUT, it was found to consist of fine particles with a specific surface area of 3 h+''/g. After crushing the powder in a mortar, it was subjected to hydrostatic pressure of 2.Q t/am'' to reduce the diameter. It was molded to a size of 8tm and 1.5fi, heated to 900°C in air over 1 hour, held at 900°C for 30 minutes, and finally fired at a higher temperature (1100 to 1300°C) for 1 hour.
得られた焼結体の電流−電圧特性を測定したところ、最
終焼成温度範囲１１００〜１３００℃の広い温度範囲に
おいて、α値５０を得た。When the current-voltage characteristics of the obtained sintered body were measured, an α value of 50 was obtained in a wide temperature range of 1100 to 1300° C. in the final firing temperature range.
比較例
従来法により、実施例１と同様の金属濃度となるように
秤量した酸化物を、混合・仮焼・粉砕・加圧成型・焼成
したところ、１３５０℃焼成では、α４０．１１００℃
焼成ではα値３０であった。Comparative Example When oxides weighed to have the same metal concentration as in Example 1 were mixed, calcined, pulverized, pressure molded, and fired using a conventional method, α40.1100°C when fired at 1350°C.
The α value was 30 during firing.
発明の効果
本発明の方法によると、アミン類を沈殿剤として用いる
ことにより高い粉末特性を持つ粉末が得られ、これを焼
結することにより高いα値を持つ酸化亜鉛バリスタを低
い温度で、且つ再現性良く製造し得られる優れた効果を
奏し得られる。Effects of the Invention According to the method of the present invention, a powder with high powder characteristics can be obtained by using amines as a precipitant, and by sintering this powder, a zinc oxide varistor with a high α value can be produced at a low temperature. It can be produced with good reproducibility and produces excellent effects.
Claims (1)
種または２種以上の塩類との混合水溶液を、アミン類の
水溶液と混合して沈殿物を作り、該沈殿物を洗浄乾燥し
、２００〜７００℃で仮焼した後、粉砕・加圧成形し、
該成型物を空気中または酸素雰囲気中で１１００〜１３
００℃で焼結することを特徴とする酸化亜鉛バリスタの
製造方法。 ２）バリスタ機能の付与剤または向上剤が、ビスマス、
コバルト、マンガン、クロム、アンチモン、プラセオヂ
ウム、シリカ等である特許請求の範囲第１項記載の酸化
亜鉛バリスタの製造方法。[Claims] 1) Zinc salts and varistor function imparting or improving agent 1
A mixed aqueous solution of seeds or two or more salts is mixed with an aqueous solution of amines to form a precipitate, the precipitate is washed and dried, calcined at 200 to 700°C, and then crushed and pressure molded. ,
The molded product was heated to 1100 to 13 in air or oxygen atmosphere.
A method for manufacturing a zinc oxide varistor, characterized by sintering at 00°C. 2) The agent for imparting or improving ballista function is bismuth,
The method for manufacturing a zinc oxide varistor according to claim 1, which is made of cobalt, manganese, chromium, antimony, praseodium, silica, etc.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62057988A JPS63224303A (en) | 1987-03-13 | 1987-03-13 | Manufacture of zinc oxide varistor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62057988A JPS63224303A (en) | 1987-03-13 | 1987-03-13 | Manufacture of zinc oxide varistor |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS63224303A true JPS63224303A (en) | 1988-09-19 |
| JPH048921B2 JPH048921B2 (en) | 1992-02-18 |
Family
ID=13071389
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP62057988A Granted JPS63224303A (en) | 1987-03-13 | 1987-03-13 | Manufacture of zinc oxide varistor |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS63224303A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2019212800A (en) * | 2018-06-06 | 2019-12-12 | Koa株式会社 | Zinc oxide varistor |
| WO2021029421A1 (en) * | 2019-08-15 | 2021-02-18 | Ｊｆｅミネラル株式会社 | Zinc oxide powder for producing zinc oxide sintered body, zinc oxide sintered body, and methods for production thereof |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS58225605A (en) * | 1982-06-25 | 1983-12-27 | 株式会社東芝 | Voltage nonlinear resistor |
| JPS58225604A (en) * | 1982-06-25 | 1983-12-27 | 株式会社東芝 | Oxide voltage nonlinear resistor |
-
1987
- 1987-03-13 JP JP62057988A patent/JPS63224303A/en active Granted
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS58225605A (en) * | 1982-06-25 | 1983-12-27 | 株式会社東芝 | Voltage nonlinear resistor |
| JPS58225604A (en) * | 1982-06-25 | 1983-12-27 | 株式会社東芝 | Oxide voltage nonlinear resistor |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2019212800A (en) * | 2018-06-06 | 2019-12-12 | Koa株式会社 | Zinc oxide varistor |
| WO2019235499A1 (en) * | 2018-06-06 | 2019-12-12 | Koa株式会社 | Zinc oxide varistor |
| US11370671B2 (en) | 2018-06-06 | 2022-06-28 | Koa Corporation | Zinc oxide varistor |
| WO2021029421A1 (en) * | 2019-08-15 | 2021-02-18 | Ｊｆｅミネラル株式会社 | Zinc oxide powder for producing zinc oxide sintered body, zinc oxide sintered body, and methods for production thereof |
| JPWO2021029421A1 (en) * | 2019-08-15 | 2021-09-13 | Ｊｆｅミネラル株式会社 | Zinc oxide powder and zinc oxide sintered body for producing zinc oxide sintered body, and a method for producing these. |
| TWI778400B (en) * | 2019-08-15 | 2022-09-21 | 日商杰富意礦物股份有限公司 | Zinc oxide powder for producing zinc oxide sintered body, zinc oxide sintered body, and method of producing these |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH048921B2 (en) | 1992-02-18 |
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| EXPY | Cancellation because of completion of term |