JPS6243325B2 - - Google Patents
Info
- Publication number
- JPS6243325B2 JPS6243325B2 JP56064605A JP6460581A JPS6243325B2 JP S6243325 B2 JPS6243325 B2 JP S6243325B2 JP 56064605 A JP56064605 A JP 56064605A JP 6460581 A JP6460581 A JP 6460581A JP S6243325 B2 JPS6243325 B2 JP S6243325B2
- Authority
- JP
- Japan
- Prior art keywords
- resistor
- protective coating
- voltage
- layer
- nitrate
- 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
- 239000010410 layer Substances 0.000 claims description 51
- 239000011253 protective coating Substances 0.000 claims description 27
- XLOMVQKBTHCTTD-UHFFFAOYSA-N Zinc monoxide Chemical compound [Zn]=O XLOMVQKBTHCTTD-UHFFFAOYSA-N 0.000 claims description 18
- 229910002651 NO3 Inorganic materials 0.000 claims description 14
- NHNBFGGVMKEFGY-UHFFFAOYSA-N Nitrate Chemical compound [O-][N+]([O-])=O NHNBFGGVMKEFGY-UHFFFAOYSA-N 0.000 claims description 14
- 239000007864 aqueous solution Substances 0.000 claims description 11
- 238000000034 method Methods 0.000 claims description 11
- 239000011787 zinc oxide Substances 0.000 claims description 9
- XNDZQQSKSQTQQD-UHFFFAOYSA-N 3-methylcyclohex-2-en-1-ol Chemical compound CC1=CC(O)CCC1 XNDZQQSKSQTQQD-UHFFFAOYSA-N 0.000 claims description 2
- 239000011248 coating agent Substances 0.000 claims description 2
- 238000000576 coating method Methods 0.000 claims description 2
- 238000001035 drying Methods 0.000 claims description 2
- 230000006866 deterioration Effects 0.000 description 8
- 239000000463 material Substances 0.000 description 7
- BNGXYYYYKUGPPF-UHFFFAOYSA-M (3-methylphenyl)methyl-triphenylphosphanium;chloride Chemical compound [Cl-].CC1=CC=CC(C[P+](C=2C=CC=CC=2)(C=2C=CC=CC=2)C=2C=CC=CC=2)=C1 BNGXYYYYKUGPPF-UHFFFAOYSA-M 0.000 description 5
- 238000007796 conventional method Methods 0.000 description 5
- 239000000843 powder Substances 0.000 description 5
- 238000010438 heat treatment Methods 0.000 description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 4
- 230000015572 biosynthetic process Effects 0.000 description 3
- 229910010272 inorganic material Inorganic materials 0.000 description 3
- 239000011147 inorganic material Substances 0.000 description 3
- 239000012212 insulator Substances 0.000 description 3
- 239000006096 absorbing agent Substances 0.000 description 2
- 239000011230 binding agent Substances 0.000 description 2
- 239000011521 glass Substances 0.000 description 2
- AMWRITDGCCNYAT-UHFFFAOYSA-L hydroxy(oxo)manganese;manganese Chemical compound [Mn].O[Mn]=O.O[Mn]=O AMWRITDGCCNYAT-UHFFFAOYSA-L 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- ONDPHDOFVYQSGI-UHFFFAOYSA-N zinc nitrate Chemical compound [Zn+2].[O-][N+]([O-])=O.[O-][N+]([O-])=O ONDPHDOFVYQSGI-UHFFFAOYSA-N 0.000 description 2
- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 description 1
- 239000000020 Nitrocellulose Substances 0.000 description 1
- WGLPBDUCMAPZCE-UHFFFAOYSA-N Trioxochromium Chemical compound O=[Cr](=O)=O WGLPBDUCMAPZCE-UHFFFAOYSA-N 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 229910000410 antimony oxide Inorganic materials 0.000 description 1
- 229910000416 bismuth oxide Inorganic materials 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 229910000423 chromium oxide Inorganic materials 0.000 description 1
- 229910000428 cobalt oxide Inorganic materials 0.000 description 1
- IVMYJDGYRUAWML-UHFFFAOYSA-N cobalt(ii) oxide Chemical compound [Co]=O IVMYJDGYRUAWML-UHFFFAOYSA-N 0.000 description 1
- 230000002542 deteriorative effect Effects 0.000 description 1
- TYIXMATWDRGMPF-UHFFFAOYSA-N dibismuth;oxygen(2-) Chemical compound [O-2].[O-2].[O-2].[Bi+3].[Bi+3] TYIXMATWDRGMPF-UHFFFAOYSA-N 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000011810 insulating material Substances 0.000 description 1
- MIVBAHRSNUNMPP-UHFFFAOYSA-N manganese(2+);dinitrate Chemical compound [Mn+2].[O-][N+]([O-])=O.[O-][N+]([O-])=O MIVBAHRSNUNMPP-UHFFFAOYSA-N 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229910044991 metal oxide Inorganic materials 0.000 description 1
- 150000004706 metal oxides Chemical class 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- KBJMLQFLOWQJNF-UHFFFAOYSA-N nickel(ii) nitrate Chemical compound [Ni+2].[O-][N+]([O-])=O.[O-][N+]([O-])=O KBJMLQFLOWQJNF-UHFFFAOYSA-N 0.000 description 1
- 150000002823 nitrates Chemical class 0.000 description 1
- 229910017604 nitric acid Inorganic materials 0.000 description 1
- 229920001220 nitrocellulos Polymers 0.000 description 1
- 239000005416 organic matter Substances 0.000 description 1
- VTRUBDSFZJNXHI-UHFFFAOYSA-N oxoantimony Chemical compound [Sb]=O VTRUBDSFZJNXHI-UHFFFAOYSA-N 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 239000002002 slurry Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
Landscapes
- Details Of Resistors (AREA)
- Thermistors And Varistors (AREA)
Description
本発明は絶縁体層を有する電圧非直線抵抗体の
保護被覆層の形成方法に関する。さらに詳しく
は、本発明は避雷器、サージアブソーバ用などに
用いられる絶縁体層を有する電圧非直線抵抗体の
耐電圧用あるいは耐環境向上用の保護被覆層の形
成方法に関する。
従来の電圧非直線抵抗体は、一般に酸化亜鉛を
主材としこれに微量の酸化ビスマス、酸化アンチ
モン、酸化コバルト、酸化マンガン、酸化クロム
などの金属酸化物を加えて造粒、成形、焼結する
ことによつて製造され、その結果電圧非直線性に
きわめてすぐれた抵抗体がえられる。しかし、こ
の抵抗体に電極を形成しただけの構造のものが直
接使用されることはほとんどない。すなち多くの
ばあい、第１図に示すように少なくとも衝撃大電
流の吸収時における空気放電による素子の外部閃
絡を防止するために、電圧非直線抵抗体１の側面
に絶縁体層３が設けられる。これで不充分なばあ
いには第２図に示すように、耐電圧性向上のため
に無機質材料からなる保護被覆層４が形成され
る。さらには第３図に示すように、電圧非直線抵
抗体の表面を化学的および機械的な損傷から守る
ために保護被覆層４を該抵抗体の電極２を除いた
全体に形成することも多く行なわれている。
このような従来の保護被覆層は、無機質材料を
用いるばあいには粉体状のものを選ぶことが多
い。かかる粉体自身には接着力がないので該抵抗
体に接着するために無機質材料の粉体とバインダ
とを混合し、該抵抗体の所定部分に塗布して熱処
理を行なうことによつて保護被覆層を形成する。
しかし、そのような工程によつて保護被覆層が
形成された電圧非直線抵抗体の電気特性はしばし
ば悪化する傾向にある。
一般に酸化亜鉛を主材とした電圧非直線抵抗体
は、還元性雰囲気下で熱処理するときその電気特
性が悪化することが知られている。したがつて前
記従来法による保護被覆層の形成によつて該抵抗
体の電気特性が悪化する原因として、保護被覆層
形成材料中の有機物が熱処理により分解し、還元
性雰囲気を発生せしめていることが考えられる。
本発明の方法は、前記のごとき従来の欠点を克
服すべくなされたものであり、無機質の粉末材料
を泥しよう状にし、これを絶縁体層を有する酸化
亜鉛を主体とする電圧非直線抵抗体の所定部分に
塗布する前に該抵抗体に硝酸塩層を形成すること
によつて該抵抗体の電気特性を維持したまま保護
被覆層を形成することを特徴とする。
硝酸塩層を形成する材料としては、たとえば硝
酸アルミニウム、硝酸マンガン、硝酸ニツケル、
硝酸亜鉛などの硝酸塩が用いられ、それらのう
ち、とくに硝酸アルミニウムが好ましい。
硝酸塩層は前記硝酸塩の水溶液中に絶縁体層と
有する電圧非直線抵抗体を浸し、つぎにオーブン
中にて100〜200℃、好ましくは110〜150℃で10〜
120分間、好ましくは20〜120分間乾燥して形成す
るか、該水溶液を該電圧非直線抵抗体を塗布する
かなどの方法で形成される。硝酸塩水溶液は、た
とえば硝酸アルミニウム９水塩（Al（NO3）3・
9H2O）のばあい0.3〜２ｇ／ｇ水、好ましくは
0.5〜１ｇ／ｇ水の濃度のものが用いられる。硝
酸塩水溶液の濃度範囲がこれよりも低いばあいに
は１回の形成操作では電気特性悪化防止の効果が
低いものしか形成されない。したがつて該低濃度
溶液を用いるばあいには、この電気特性悪化防止
層の形成操作をくり返す必要性が生じてくる。
さらに硝酸塩層が形成された前記電圧非直線抵
抗体には、常法により保護被覆層が形成される。
本発明においては、保護被覆層を形成するばあ
いに、もしかりに保護被覆層形成材料に由来する
還元性雰囲気が発生したとしても、該抵抗体と保
護被覆層との間に形成された硝酸アルミニウムな
どの電気特性の悪化を防止するための硝酸塩層に
よつてその影響が弱められるか消滅せしめられる
から該抵抗体の電気特性の悪化を防ぐことができ
る。さらには避雷器、サージアブソーバなどにお
いて絶縁体層を有する酸化亜鉛を主体とする電圧
非直線抵抗体を金属、セラミツクおよび絶縁物な
どで機械的に補強して周辺部を一体化するばあい
にも、本発明の方法を適用するときには該抵抗体
の電気特性はほとんど悪化しない。
以上のように本発明によれば、絶縁体層を有す
る酸化亜鉛を主体とする電圧非直線抵抗体の電気
特性を悪化させることなく該抵抗体の任意の部分
あるいは全体に耐電圧用、耐環境向上用の保護被
覆層を形成することができる。
つぎに実施例をあげて本発明の方法を説明する
が、本発明はその実施例のみに限定されるもので
はない。
実施例
第１図に示す形態を有する絶縁体層を有する酸
化亜鉛を主体とする電圧非直線抵抗体をAl
（NO3）3・9H2Oの50ｇおよび水100ｇよりなる硝
酸アルミニウム水溶液に浸し、つぎにオーブンに
て110℃で30分間乾燥し硝酸アルミニウムを該抵
抗体に付着させた。
このものにたとえば鉛系ガラスなどのような低
融点ガラス粉末とニトロセルロースなどの有機物
バインダを混合して泥しよう化したものを保護被
覆層材料として第３図に示した形態に塗布したの
ち、バツチ炉にて500℃で１時間熱処理を施して
保護被覆層を形成した。
かくしてえられた電気特性の悪化を防止するた
めの硝酸塩層を有し、かつ保護被覆層が形成され
た絶縁体層を有する酸化亜鉛を主体とする電圧非
直線抵抗体Ａの保護被覆層形成前後の両電極間の
電圧を測定した。比較のために、従来法によつて
えられた硝酸塩層を有しない絶縁体層を有する酸
化亜鉛を主体とする電圧非直線抵抗体Ｂおよび
Al（NO3）3・9H2Oの10ｇと水100ｇとからなる水
溶液を用いた本発明の方法によつてえられた抵抗
体Ｃの保護被覆層形成前後の両電極間の電圧を測
定した。対照として第１図に示す形の抵抗体Ｄを
前記と同様にバツチ炉にて500℃で１時間熱処理
した前後の両電極間の電圧も測定した。それらの
結果を第１表に示す。
第１表においてＶ10〓AおよびＶ1nAは、それぞ
れ抵抗体に10μＡおよび1mAの電流を流したと
きの両電極間のバリスタ電圧の測定値を表わし、
（ΔＶ／Ｖ）10〓Aおよび（ΔＶ／Ｖ）1nAは各電圧
測定値の変化率を表わす。
The present invention relates to a method for forming a protective coating layer of a voltage nonlinear resistor having an insulating layer. More specifically, the present invention relates to a method for forming a protective coating layer for improving voltage resistance or environment resistance of a voltage nonlinear resistor having an insulating layer used for lightning arresters, surge absorbers, and the like. Conventional voltage nonlinear resistors are generally made of zinc oxide as the main material, to which trace amounts of metal oxides such as bismuth oxide, antimony oxide, cobalt oxide, manganese oxide, and chromium oxide are added, then granulated, molded, and sintered. The result is a resistor with excellent voltage nonlinearity. However, a structure in which only electrodes are formed on this resistor is rarely used directly. That is, in many cases, as shown in FIG. 1, an insulating layer 3 is provided on the side surface of the voltage nonlinear resistor 1 in order to prevent external flash shorting of the element due to air discharge at least when absorbing a large impact current. will be provided. If this is insufficient, as shown in FIG. 2, a protective coating layer 4 made of an inorganic material is formed to improve voltage resistance. Furthermore, as shown in FIG. 3, in order to protect the surface of the voltage nonlinear resistor from chemical and mechanical damage, a protective coating layer 4 is often formed on the entire surface of the resistor except for the electrodes 2. It is being done. When using an inorganic material, such a conventional protective coating layer is often in powder form. Since the powder itself does not have adhesive strength, in order to adhere to the resistor, inorganic material powder and a binder are mixed, applied to a predetermined part of the resistor, and heat treated to form a protective coating. form a layer. However, the electrical characteristics of a voltage nonlinear resistor on which a protective coating layer is formed by such a process often tend to deteriorate. It is generally known that the electrical characteristics of a voltage nonlinear resistor mainly made of zinc oxide deteriorate when it is heat treated in a reducing atmosphere. Therefore, the cause of the deterioration of the electrical characteristics of the resistor due to the formation of the protective coating layer by the conventional method is that the organic matter in the material for forming the protective coating layer is decomposed by heat treatment and a reducing atmosphere is generated. is possible. The method of the present invention has been made to overcome the above-mentioned drawbacks of the conventional methods, and consists of forming an inorganic powder material into a slurry-like form and applying it to a voltage non-linear resistor mainly composed of zinc oxide and having an insulating layer. The protective coating layer is formed while maintaining the electrical characteristics of the resistor by forming a nitrate layer on the resistor before coating on a predetermined portion of the resistor. Examples of materials forming the nitrate layer include aluminum nitrate, manganese nitrate, nickel nitrate,
Nitrates such as zinc nitrate are used, and among these, aluminum nitrate is particularly preferred. The nitrate layer is formed by immersing the insulating layer and the voltage nonlinear resistor in an aqueous solution of the nitrate, and then heating it in an oven at 100 to 200°C, preferably 110 to 150°C for 10 to 30 minutes.
It is formed by drying for 120 minutes, preferably 20 to 120 minutes, or by applying the aqueous solution to the voltage nonlinear resistor. The nitrate aqueous solution is, for example, aluminum nitrate nonahydrate (Al(NO 3 ) 3 .
9H2O ) 0.3-2g/g water, preferably
A concentration of 0.5 to 1 g/g water is used. If the concentration range of the nitrate aqueous solution is lower than this, a single forming operation will only form a solution that is less effective in preventing deterioration of electrical properties. Therefore, when the low concentration solution is used, it becomes necessary to repeat the formation operation of the layer for preventing deterioration of electrical properties. Furthermore, a protective coating layer is formed on the voltage nonlinear resistor on which the nitrate layer is formed by a conventional method. In the present invention, when forming a protective coating layer, even if a reducing atmosphere derived from the material for forming the protective coating layer is generated, the nitric acid formed between the resistor and the protective coating layer The influence of aluminum or the like is weakened or eliminated by the nitrate layer for preventing deterioration of the electrical characteristics of the resistor, thereby preventing deterioration of the electrical characteristics of the resistor. Furthermore, in lightning arresters, surge absorbers, etc., a voltage non-linear resistor mainly made of zinc oxide with an insulating layer is mechanically reinforced with metal, ceramic, insulating material, etc. to integrate the peripheral part. When the method of the present invention is applied, the electrical characteristics of the resistor are hardly deteriorated. As described above, according to the present invention, any part or the entirety of the voltage non-linear resistor mainly made of zinc oxide having an insulating layer can be made to withstand voltage or withstand the environment without deteriorating the electrical characteristics of the resistor. A protective coating layer for enhancement can be formed. Next, the method of the present invention will be explained with reference to Examples, but the present invention is not limited to these Examples. Example A voltage nonlinear resistor mainly made of zinc oxide and having an insulating layer having the form shown in Fig.
The resistor was immersed in an aluminum nitrate aqueous solution consisting of 50 g of (NO 3 ) 3 ·9H 2 O and 100 g of water, and then dried in an oven at 110° C. for 30 minutes to adhere aluminum nitrate to the resistor. A mixture of low-melting point glass powder such as lead-based glass and an organic binder such as nitrocellulose to form slurry is applied to this material as a protective coating layer material in the form shown in Figure 3, and then batch-coated. A protective coating layer was formed by heat treatment in a furnace at 500°C for 1 hour. Before and after formation of the protective coating layer of voltage nonlinear resistor A mainly made of zinc oxide, which has a nitrate layer for preventing deterioration of the electrical characteristics obtained in this way, and an insulator layer on which a protective coating layer is formed. The voltage between both electrodes was measured. For comparison, voltage nonlinear resistor B and
The voltage between the two electrodes of resistor C obtained by the method of the present invention using an aqueous solution consisting of 10 g of Al(NO 3 ) 3.9H 2 O and 100 g of water was measured before and after the protective coating layer was formed. . As a control, a resistor D having the shape shown in FIG. 1 was heat-treated at 500 DEG C. for 1 hour in a batch furnace in the same manner as described above, and the voltage between the two electrodes was also measured. The results are shown in Table 1. In Table 1, V 10 〓 A and V 1nA represent the measured values of the varistor voltage between the two electrodes when currents of 10 μA and 1 mA are passed through the resistor, respectively,
(ΔV/V) 10 〓 A and (ΔV/V) 1 nA represent the rate of change of each voltage measurement.
【表】
第１表の試料番号７、８における結果より、電
圧非直線抵抗体は熱処理によつてバリスタ電圧が
数％程度変化することがわかる。従来法により保
護被覆層を形成すると、試料番号３、４にみられ
るようにバリスタ電圧はＶ10〓A、Ｖ1nAとも50％
以上の変化率を示し電圧非直線抵抗体としてはも
はや使用できないほど電気特性は悪化する。しか
し本発明の方法によつて形成された試料番号１、
２のものではバリスタ電圧の変化は試料番号７、
８程度であり、従来法による保護被覆層の形成に
よつてみられる電気特性の悪化は認められない。
ただし試料番号５、６にみられるように使用する
硝酸アルミニウム水溶液濃度が低いばあいには、
電気特性悪化防止層としての効果は小さくなつて
しまう。[Table] From the results for sample numbers 7 and 8 in Table 1, it can be seen that the varistor voltage of the voltage nonlinear resistor changes by several percent due to heat treatment. When a protective coating layer is formed using the conventional method, the varistor voltage is 50% for both V 10 〓 A and V 1nA as seen in sample numbers 3 and 4.
The electrical characteristics deteriorate to such an extent that it can no longer be used as a voltage nonlinear resistor. However, sample number 1 formed by the method of the present invention,
2, the change in varistor voltage is sample number 7,
8, and there is no deterioration in electrical properties that is observed when forming a protective coating layer using the conventional method.
However, if the concentration of the aluminum nitrate aqueous solution used is low, as seen in sample numbers 5 and 6,
The effect as a layer for preventing deterioration of electrical properties is reduced.
第１図は電極と側面絶縁体層を有する電圧非直
線抵抗体の断面図、第２図は第１図に示される電
圧非直線抵抗体にさらに保護被覆層を形成したも
のの断面図、第３図は第１図に示される電圧非直
線抵抗体の電極を除いたすべての表面に保護被覆
層を形成したものの断面図である。
（図面の符号） １：電圧非直線抵抗体、２：
電極、３：絶縁体層、４：保護被覆層。
Fig. 1 is a cross-sectional view of a voltage non-linear resistor having an electrode and a side insulator layer, Fig. 2 is a cross-sectional view of the voltage non-linear resistor shown in Fig. 1 with a protective coating layer further formed, and Fig. 3 is a cross-sectional view of a voltage non-linear resistor shown in Fig. The figure is a sectional view of the voltage nonlinear resistor shown in FIG. 1, with a protective coating layer formed on all surfaces except for the electrodes. (Symbols in the drawing) 1: Voltage nonlinear resistor, 2:
Electrode, 3: Insulator layer, 4: Protective coating layer.
Claims (1)
非直線抵抗体上に硝酸塩層を形成したのち保護被
覆層を形成することを特徴とする絶縁体層を有す
る電圧非直線抵抗体の保護被覆層の形成方法。 ２ 前記硝酸塩層が絶縁体層を有する酸化亜鉛を
主体とする電圧非直線抵抗体を硝酸塩水溶液に浸
すか該電圧非直線抵抗体に硝酸塩水溶液を塗布し
たのち乾燥して形成される特許請求の範囲第１項
記載の方法。 ３ 前記硝酸塩水溶液が硝酸アルミニウム９水塩
の水溶液である特許請求の範囲第２項記載の方
法。[Claims] 1. A voltage nonlinear resistor having an insulating layer, characterized in that a nitrate layer is formed on a voltage nonlinear resistor mainly made of zinc oxide, and a protective coating layer is then formed on the voltage nonlinear resistor having an insulating layer. A method for forming a protective coating layer for a resistor. 2 Claims in which the nitrate layer is formed by immersing a voltage nonlinear resistor mainly made of zinc oxide and having an insulating layer in a nitrate aqueous solution, or by coating the voltage nonlinear resistor with a nitrate aqueous solution and then drying the voltage nonlinear resistor. The method described in paragraph 1. 3. The method according to claim 2, wherein the nitrate aqueous solution is an aqueous solution of aluminum nitrate nonahydrate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP56064605A JPS57178303A (en) | 1981-04-28 | 1981-04-28 | Method of forming protective coating layer for voltage nonlinear resistor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP56064605A JPS57178303A (en) | 1981-04-28 | 1981-04-28 | Method of forming protective coating layer for voltage nonlinear resistor |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS57178303A JPS57178303A (en) | 1982-11-02 |
| JPS6243325B2 true JPS6243325B2 (en) | 1987-09-12 |
Family
ID=13263047
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP56064605A Granted JPS57178303A (en) | 1981-04-28 | 1981-04-28 | Method of forming protective coating layer for voltage nonlinear resistor |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS57178303A (en) |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5249491A (en) * | 1975-10-16 | 1977-04-20 | Meidensha Electric Mfg Co Ltd | Non-linear resistor |
-
1981
- 1981-04-28 JP JP56064605A patent/JPS57178303A/en active Granted
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5249491A (en) * | 1975-10-16 | 1977-04-20 | Meidensha Electric Mfg Co Ltd | Non-linear resistor |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS57178303A (en) | 1982-11-02 |
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