JPH0742135B2 - Glass composition for zinc oxide varistor and zinc oxide varistor - Google Patents
Glass composition for zinc oxide varistor and zinc oxide varistorInfo
- Publication number
- JPH0742135B2 JPH0742135B2 JP3035392A JP3539291A JPH0742135B2 JP H0742135 B2 JPH0742135 B2 JP H0742135B2 JP 3035392 A JP3035392 A JP 3035392A JP 3539291 A JP3539291 A JP 3539291A JP H0742135 B2 JPH0742135 B2 JP H0742135B2
- Authority
- JP
- Japan
- Prior art keywords
- weight
- zinc oxide
- parts
- oxide
- voltage
- 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 - Fee Related
Links
Description
【０００１】[0001]
【産業上の利用分野】この発明は酸化亜鉛バリスタ素体
内に拡散させるガラス組成物とこのガラス組成物を拡散
させた酸化亜鉛バリスタに関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a glass composition for diffusing into a zinc oxide varistor element body and a zinc oxide varistor in which the glass composition is diffused.
【０００２】[0002]
【従来の技術】酸化亜鉛を主成分とする焼結体からなる
酸化亜鉛バリスタは他のバリスタと比較して電圧非直線
特性に優れ、しかもサージ吸収能が大きいので、電圧安
定化素子として広く使用されている。2. Description of the Related Art A zinc oxide varistor composed of a sintered body containing zinc oxide as a main component is widely used as a voltage stabilizing element because it has excellent voltage non-linearity characteristics and has a large surge absorbing ability as compared with other varistor. Has been done.
【０００３】ところで、電子部品は各種の環境下におい
て長時間にわたって使用されるので、酸化亜鉛バリスタ
を電圧安定化素子として使用するためには、上記の電気
的諸特性以外に、各種温度や湿度環境下における連続的
負荷に対してバリスタ電圧ができるだけ安定していなけ
ればならない。By the way, since electronic parts are used for a long time in various environments, in order to use the zinc oxide varistor as a voltage stabilizing element, in addition to the above-mentioned electrical characteristics, various temperature and humidity environments are required. The varistor voltage should be as stable as possible under continuous load.
【０００４】しかし、これまで知られている酸化亜鉛バ
リスタは、そのバリスタ電圧がこのような連続的負荷に
対して必ずしも安定しておらず、例えば高温環境下にお
いて長時間にわたって常時課電負荷を与えた場合、バリ
スタ電圧が大幅に低下してしまうことがあった。However, the zinc oxide varistor known so far does not always have a stable varistor voltage against such a continuous load and, for example, is constantly subjected to a load for a long time in a high temperature environment. In that case, the varistor voltage may drop significantly.
【０００５】そこで、特公昭５０−２４０３７公報に開
示されているように、酸化亜鉛バリスタの素体に導電ペ
ーストを焼き付けて電極を形成する前に、この素体の表
裏面にガラスペーストを塗布し、焼成によってこのガラ
スペースト中のガラス組成物を素体の内部に拡散させて
内部の空隙をこのガラス組成物で充填し、上記のような
連続的負荷に対するバリスタ電圧の低下を解消するよう
にした酸化亜鉛バリスタが提案されている。Therefore, as disclosed in Japanese Examined Patent Publication (Kokoku) No. 50-24037, a glass paste is applied to the front and back surfaces of a zinc oxide varistor element body before baking a conductive paste to form electrodes. The glass composition in the glass paste was diffused into the element body by firing to fill the internal voids with the glass composition, thereby eliminating the above-mentioned decrease in varistor voltage with respect to continuous load. Zinc oxide varistors have been proposed.
【０００６】この提案で、酸化亜鉛バリスタの素体の内
部に拡散させるガラス組成物としては、酸化ビスマス６
０〜８５重量％、シリカ５〜２０重量％および無水ホウ
酸５〜２０重量％から成る組成物１００重量部に対し
て、酸化コバルト５〜２０重量部および酸化銀２〜２５
重量部を配合して成るものが使用されている。According to this proposal, bismuth oxide 6 is used as a glass composition for diffusing into the element body of a zinc oxide varistor.
5 to 20 parts by weight of cobalt oxide and 2 to 25 parts by weight of silver oxide based on 100 parts by weight of a composition consisting of 0 to 85% by weight, silica 5 to 20% by weight and boric anhydride 5 to 20% by weight.
A mixture of parts by weight is used.
【０００７】[0007]
【発明が解決しようとする課題】しかし、この提案の酸
化亜鉛バリスタは、耐湿負荷特性について充分に検討さ
れておらず、しかも他の電気的諸特性（電圧非直線係数
α、制限電圧比、サージ電流特性等）についても全く検
討されていないので、電圧安定化素子としては充分に満
足できる電気的諸特性を有するものではなかった。However, the proposed zinc oxide varistor has not been sufficiently examined for its moisture resistance load characteristics, and has other electrical characteristics (voltage nonlinear coefficient α, limiting voltage ratio, surge voltage). Since the current characteristics, etc.) have not been studied at all, the voltage stabilizing element does not have sufficiently satisfactory electrical characteristics.
【０００８】ここで、耐湿負荷特性とは、湿度の高い雰
囲気中において素子に長時間にわたって常時課電した前
後におけるバリスタ電圧から求めた変化率で表わされる
ものをいう。この耐湿負荷特性はできるだけ小さい方が
好ましい。Here, the moisture resistance load characteristic is represented by the rate of change obtained from the varistor voltage before and after the element is constantly energized for a long time in an atmosphere of high humidity. It is preferable that this moisture load resistance characteristic is as small as possible.
【０００９】また、電圧非直線係数αとは、次の数１か
ら得られる数値αをいい、この数値αはできるだけ大き
い方が好ましい。The voltage non-linearity coefficient α is a numerical value α obtained from the following equation 1, and it is preferable that the numerical value α is as large as possible.
【００１０】[0010]
【数１】[Equation 1]
【００１１】また、制限電圧比とは、大電流領域におけ
る非直線性を示す指標であり、素子に大電流を流した時
のバリスタ電圧と微小電流を流した時のバリスタ電圧と
の比で表わされるものをいう。この制限電圧比はできる
だけ小さい方が好ましい。The limiting voltage ratio is an index showing non-linearity in a large current region, and is represented by a ratio between a varistor voltage when a large current is applied to the device and a varistor voltage when a minute current is applied. What is said. This limiting voltage ratio is preferably as small as possible.
【００１２】また、サージ電流特性とは、素子にサージ
電流を流した後におけるバリスタ電圧の変化率で表わさ
れるものをいい、このサージ電流特性はできるだけ小さ
い方が好ましい。The surge current characteristic is represented by the rate of change of the varistor voltage after the surge current is passed through the element, and it is preferable that the surge current characteristic is as small as possible.
【００１３】この発明は、耐湿負荷特性に優れ、しかも
上述した他の電気的諸特性にも優れた酸化亜鉛バリスタ
を得るための酸化亜鉛バリスタ用ガラス組成物と酸化亜
鉛バリスタを提供することを目的とするものである。It is an object of the present invention to provide a zinc oxide varistor glass composition and a zinc oxide varistor for obtaining a zinc oxide varistor which is excellent in moisture resistance load characteristics and also excellent in other electrical characteristics described above. It is what
【００１４】[0014]
【課題を解決するための手段】この発明に係る酸化亜鉛
バリスタ用ガラス組成物は、酸化ビスマス９０〜９７重
量％、二酸化ケイ素３〜１０重量％からなる組成物１０
０重量部に対して、酸化コバルトを１〜１０重量部、酸
化ホウ素を１〜５重量部及び酸化銀を０．５〜４重量部
添加してなるものである。The glass composition for a zinc oxide varistor according to the present invention comprises a composition 10 comprising 90 to 97% by weight of bismuth oxide and 3 to 10% by weight of silicon dioxide.
1 to 10 parts by weight of cobalt oxide, 1 to 5 parts by weight of boron oxide, and 0.5 to 4 parts by weight of silver oxide are added to 0 parts by weight.
【００１５】また、この発明に係る酸化亜鉛バリスタ
は、酸化亜鉛を主成分とする焼結体からなる素体と、こ
の素体に拡散させた上記ガラス組成物と、この素体の外
部に形成された電極とを備えたものである。Further, the zinc oxide varistor according to the present invention is formed on the outside of this element body, the element body made of a sintered body containing zinc oxide as a main component, the glass composition diffused in this element body. And an electrode that has been formed.
【００１６】ここで、酸化ビスマスは９０〜９７重量％
の範囲が好ましい。酸化ビスマスが９０重量％未満では
サージ電流特性が悪くなり、９７重量％を越えると電圧
非直線係数αおよび耐湿負荷特性が悪くなるからであ
る。Here, the bismuth oxide is 90 to 97% by weight.
Is preferred. This is because if the bismuth oxide content is less than 90% by weight, the surge current characteristic becomes poor, and if it exceeds 97% by weight, the voltage nonlinear coefficient α and the moisture resistance load characteristic become poor.
【００１７】また、二酸化ケイ素は３〜１０重量％の範
囲が好ましい。二酸化ケイ素が３重量％未満では均質な
ガラスが形成され難くなり、１０重量％を越えるとガラ
スの軟化点が高くなって素体中への拡散が困難になるか
らである。The silicon dioxide content is preferably in the range of 3 to 10% by weight. This is because if silicon dioxide is less than 3% by weight, it is difficult to form a homogeneous glass, and if it exceeds 10% by weight, the softening point of glass becomes high and it becomes difficult to diffuse it into the element body.
【００１８】また、酸化コバルトは１〜１０重量部の範
囲が好ましい。酸化コバルトがこの範囲を逸脱すると電
圧非直線係数αが小さくなり、サージ電流特性も悪くな
るからである。The amount of cobalt oxide is preferably in the range of 1 to 10 parts by weight. This is because if the cobalt oxide deviates from this range, the voltage non-linearity coefficient α becomes small and the surge current characteristic also deteriorates.
【００１９】また、酸化ホウ素は１〜５重量部の範囲が
好ましい。酸化ホウ素が１重量部未満では電圧非直線係
数αが小さくなるとともに、耐湿負荷特性が悪くなり、
５重量部を越えるとサージ電流特性が悪くなるからであ
る。The boron oxide content is preferably in the range of 1 to 5 parts by weight. When the content of boron oxide is less than 1 part by weight, the voltage non-linearity coefficient α decreases and the moisture resistance load characteristic deteriorates.
This is because if the amount exceeds 5 parts by weight, the surge current characteristic deteriorates.
【００２０】また、酸化銀は０．５〜４重量部の範囲が
好ましい。酸化銀が０．５重量部未満では耐湿負荷特性
およびサージ電流特性が悪くなり、４重量部を越える
と、電圧非直線係数αが低下し、通常の製造方法（単な
る空気中での溶解）ではＡｇが析出してガラスの形成が
困難となるからである。The silver oxide content is preferably 0.5 to 4 parts by weight. If the amount of silver oxide is less than 0.5 parts by weight, the moisture resistance load characteristic and the surge current characteristic are deteriorated. This is because Ag is deposited and it becomes difficult to form glass.
【００２１】[0021]
【作用】酸化亜鉛を主成分とする焼結体からなる素体の
表裏面にこの発明に係るガラス組成物のペーストを塗布
した後、焼成すると、この焼成によってガラス組成物が
素体の内部に拡散し、内部の空隙を満たし、また、隣接
する粒子相互を強固に結合する。Operation: When the paste of the glass composition according to the present invention is applied to the front and back surfaces of an element body made of a sintered body containing zinc oxide as a main component and then fired, the glass composition is transferred to the inside of the element body by this firing. It diffuses, fills voids inside, and firmly bonds adjacent particles to each other.
【００２２】[0022]
【実施例】まず、酸化亜鉛（ＺｎＯ）の粉末に酸化ビス
マス（Ｂ2 Ｏ3 ）、酸化アンチモン（Ｓｂ2 Ｏ3 ）、酸
化コバルト（ＣｏＯ）、酸化マンガン（ＭｎＯ）、酸化
ニッケル（ＮｉＯ）、酸化クロム（Ｃｒ2 Ｏ3 ）の粉末
をそれぞれ０．０１〜５ｍｏｌ％添加し、これらをボー
ルミル中において２０ｈｒ攪拌混合して酸化亜鉛バリス
タの原料粉末を得た。EXAMPLES First, zinc oxide (ZnO) powder was added to bismuth oxide (B 2 O 3 ), antimony oxide (Sb 2 O 3 ), cobalt oxide (CoO), manganese oxide (MnO), nickel oxide (NiO), Powders of chromium oxide (Cr 2 O 3 ) were added in an amount of 0.01 to 5 mol%, and these were stirred and mixed in a ball mill for 20 hours to obtain raw material powders of zinc oxide varistor.
【００２３】次に、この原料粉末にバインダーを加えて
造粒し、これを成形機で圧縮成形して、直径９ｍｍ、厚
さ１．４ｍｍのディスク状の成形体を得た。そして、こ
の成形体を大気中において１１００〜１４００℃の温度
で２時間焼成して、酸化亜鉛を主成分とする焼結体から
なる酸化亜鉛バリスタ素体を得た。Next, a binder was added to this raw material powder and granulated, and this was compression-molded by a molding machine to obtain a disk-shaped molded body having a diameter of 9 mm and a thickness of 1.4 mm. Then, this molded body was fired in the atmosphere at a temperature of 1100 to 1400 ° C. for 2 hours to obtain a zinc oxide varistor body composed of a sintered body containing zinc oxide as a main component.
【００２４】一方、酸化ビスマス（Ｂｉ2 Ｏ3 ）９０〜
９９重量％、二酸化ケイ素（ＳｉＯ2 ）１〜１２重量％
から成る組成物１００重量部に対して酸化ホウ素（Ｂ2
Ｏ3）０．５〜７重量部、酸化コバルト（ＣｏＯ）０．
５〜１５重量部、酸化銀（Ａｇ2 Ｏ）を０．２〜５重量
部添加し、これらをボールミルで攪拌混合してガラス組
成物用の原料粉末を得た。On the other hand, bismuth oxide (Bi 2 O 3 ) 90-
99% by weight, silicon dioxide (SiO 2 ) 1 to 12% by weight
100 parts by weight of a composition consisting of boron oxide (B 2
O 3) 0.5 to 7 parts by weight of cobalt oxide (CoO) 0.
5 to 15 parts by weight and 0.2 to 5 parts by weight of silver oxide (Ag 2 O) were added, and these were stirred and mixed with a ball mill to obtain a raw material powder for a glass composition.
【００２５】次に、この原料粉末を白金ルツボに入れ、
９００〜１２００℃で３０分間加熱して溶融させてガラ
ス物質を得、これを水中に投入して急冷し、得られた粒
状ガラスを粉砕し、ガラスフリットを作成した。Next, this raw material powder is put into a platinum crucible,
A glass substance was obtained by heating by melting at 900 to 1200 ° C. for 30 minutes to obtain a glass substance, which was put into water and rapidly cooled, and the obtained granular glass was crushed to prepare a glass frit.
【００２６】次に、このガラスフリットに糊成分を、ガ
ラスフリットと糊成分の重量比が１：５の割合となるよ
うに配合し、混合して均質なガラスペーストを得た。こ
こで、糊成分としてはエチルセルロース１００重量部を
酢酸−ｎ−ブチル５００とｎ−ブチルカルビトール５０
重量部との混合溶剤に溶解したものを使用した。Next, a paste component was added to this glass frit so that the weight ratio of the glass frit and the paste component was 1: 5, and mixed to obtain a homogeneous glass paste. Here, as a paste component, 100 parts by weight of ethyl cellulose was mixed with 500 parts of n-butyl acetate and 50 parts of n-butyl carbitol.
What was melt | dissolved in the mixed solvent with weight part was used.
【００２７】以上のように調製されたガラスペーストを
上記の酸化亜鉛バリスタ素体の表裏面に塗布し、大気中
において９００〜１２００℃で０．５〜２時間焼成し
た。ガラスペーストはこの焼成によってガラス組成物と
なり、素体中に拡散して内部の空隙を埋め、また内部粒
子を連結強化することになる。The glass paste prepared as described above was applied to the front and back surfaces of the zinc oxide varistor element body, and fired in the air at 900 to 1200 ° C. for 0.5 to 2 hours. The glass paste becomes a glass composition by this firing, diffuses into the element body, fills voids inside, and strengthens the connection of the internal particles.
【００２８】次に、この酸化亜鉛バリスタ素体の表裏面
に導電ペーストを塗布し、５００〜９００℃で０．５〜
２時間焼き付けた。導電ペーストはこの焼き付けによっ
て金属の電極となり、素体の表裏面に電極が形成された
酸化亜鉛バリスタが形成された。Next, a conductive paste is applied to the front and back surfaces of this zinc oxide varistor element body, and the temperature of 0.5 to 0.5 at 500 to 900 ° C.
Baked for 2 hours. By this baking, the conductive paste became a metal electrode, and a zinc oxide varistor having electrodes formed on the front and back surfaces of the element body was formed.
【００２９】次に、この酸化亜鉛バリスタについて電圧
非直線係数α、大電流領域における非直線性（制限電圧
比）、湿度の高い雰囲気における常時課電前後の小電流
領域の電圧の変化率（耐湿負荷特性）及びサージ電流印
加前後の小電流領域の電圧変化率（サージ電流特性）を
調べたところ表１のようになった。Next, with respect to this zinc oxide varistor, the voltage non-linearity coefficient α, the non-linearity in the high current area (limit voltage ratio), the rate of change of the voltage in the small current area before and after the constant voltage application in a high humidity atmosphere (moisture resistance) The load characteristics) and the voltage change rate (surge current characteristics) in the small current region before and after the application of the surge current were examined.
【００３０】ここで、電圧非直線係数αは、前述した数
１を用い、１ｍＡと１０ｍＡの電流を流した時の端子間
電圧Ｖ１ｍＡとＶ１０ｍＡとより求めた。Here, the voltage non-linearity coefficient α was determined from the terminal voltages V 1mA and V 10mA when currents of 1 mA and 10 mA were applied using the above-mentioned equation 1.
【００３１】また、制限電圧比は、素子に１ｍＡの電流
を流した時の端子間電圧Ｖ1mA と、素子に６００Ａの電
流を流した時の端子間電圧Ｖ600Aとの比（Ｖ600A／Ｖ
1mA ）として求めた。なお、端子間電圧Ｖ600Aは８×２
０μ・ｓの波形のサージ電流を流して測定した。The limiting voltage ratio is a ratio (V 600A / V) between the terminal voltage V 1mA when a current of 1mA is applied to the element and the terminal voltage V 600A when a current of 600A is applied to the element.
1mA ). The terminal voltage V 600A is 8 × 2
The measurement was performed by applying a surge current having a waveform of 0 μs.
【００３２】また、耐湿負荷特性は、６０℃、湿度９５
％の下で素子に０．８５×Ｖ1mA の電圧を５００ｈｒ印
加した前後において、各々１０μＡの電流を流した時の
端子間電圧（Ｖ10μA ）の変化率ΔＶ／Ｖ10μA として
求めた。Moisture resistance characteristics are 60 ° C and 95% humidity.
In% before and after a voltage of 0.85 × V 1 mA to the element to 500hr applied under, calculated as the rate of change ΔV / V 10 μ A terminal voltage (V 10 μ A) upon applying each 10μA current It was
【００３３】また、サージ電流特性は、素子に８×２０
μ・ｓの波形で６００Ａのサージ電流を同一方向に２回
印加した前後において、各々１０μＡの電流を流した時
の端子間電圧Ｖ10μA の変化率（ΔＶ／Ｖ10μA ）とし
て求めた。The surge current characteristic is 8 × 20 for the element.
before and after the applied twice waveform mu · s surge currents 600A in the same direction, determined as the rate of change of terminal voltage V 10 mu A upon applying each 10μA of current (ΔV / V 10 μ A) It was
【００３４】更に、表１中、Ｂ2 Ｏ3 ，ＣｏＯ，Ａｇ2
Ｏの欄の数値はＢｉ2 Ｏ3 ，ＳｉＯ2 の合計重量１００
重量部に対するものであり、また、※印が付されたＮｏ
の試料は比較例である。Further, in Table 1, B 2 O 3 , CoO, Ag 2
The value in the O column is the total weight of Bi 2 O 3 and SiO 2 of 100.
It is for parts by weight and is marked with *
Is a comparative example.
【００３５】[0035]
【表１】 [Table 1]
【００３６】この表１の結果から次のことが明らかにな
った。まず、特許請求の範囲に入るＮｏ２，３，６，
７，１０〜１２，１５，１６の試料は他のＮｏの試料と
比較して非直線係数α、制限電圧比、耐湿負荷特性、サ
ージ電流特性がいずれも良好になっているFrom the results shown in Table 1, the following is revealed. First, No2, 3, 6, which falls within the scope of claims
The samples of Nos. 7, 10 to 12, 15, and 16 have better non-linearity coefficient α, limiting voltage ratio, moisture resistance load characteristic, and surge current characteristic than the other No samples.
【００３７】これに対し、特許請求の範囲に入らない試
料はこれらの電気的諸特性のいずれかが悪くなってい
る。すなわち、酸化ビスマスが９０重量％未満のＮｏ１
の試料ではサージ電流特性が悪くなり、酸化ビスマスが
９７重量％を越えるＮｏ４の試料では電圧非直線係数α
および耐湿負荷特性が悪くなっている。On the other hand, the samples that do not fall within the scope of the claims have poor electrical characteristics. That is, No1 containing less than 90% by weight of bismuth oxide
The sample No. 4 has a poor surge current characteristic, and the sample No. 4 in which bismuth oxide exceeds 97% by weight has a voltage nonlinear coefficient α
And the humidity load resistance is poor.
【００３８】また、酸化コバルトが１〜１０重量部の範
囲を逸脱すると、Ｎｏ９及び１３の試料からわかるよう
に、電圧非直線係数αが小さくなり、サージ電流特性も
悪くなっている。Further, when the cobalt oxide deviates from the range of 1 to 10 parts by weight, as can be seen from the samples of Nos. 9 and 13, the voltage non-linearity coefficient α becomes small and the surge current characteristic also becomes poor.
【００３９】また、酸化ホウ素が１重量部未満のＮｏ５
の試料では電圧非直線係数αが小さくなるとともに、耐
湿負荷特性が悪くなり、酸化ホウ素が５重量部を越える
Ｎｏ７の試料ではサージ電流特性が悪くなっている。No. 5 containing less than 1 part by weight of boron oxide
In the sample No. 7, the voltage non-linearity coefficient α becomes smaller, the moisture resistance load characteristic becomes worse, and in the sample No. 7 in which boron oxide exceeds 5 parts by weight, the surge current characteristic becomes poor.
【００４０】また、酸化銀が０．５重量部未満ではＮｏ
１４の試料では耐湿負荷特性およびサージ電流特性が悪
くなり、酸化銀が４重量部を越えるＮｏ１７の試料で
は、非直線係数αが低下している。If the silver oxide content is less than 0.5 part by weight, no
The moisture resistance load characteristic and the surge current characteristic were deteriorated in the sample No. 14, and the non-linear coefficient α was lowered in the sample No. 17 in which silver oxide exceeded 4 parts by weight.
【００４１】[0041]
【発明の効果】この発明によれば、電圧非直線係数αが
大きくなり、また耐湿負荷等の連続負荷に対してバリス
タ電圧が安定するという効果がある。According to the present invention, the voltage non-linearity coefficient α is increased and the varistor voltage is stabilized against a continuous load such as a moisture resistant load.
【数１】 [Equation 1]
Claims (2)
ケイ素３〜１０重量％からなる組成物１００重量部に対
して、酸化コバルトを１〜１０重量部、酸化ホウ素を１
〜５重量部及び酸化銀を０．５〜４重量部添加してなる
酸化亜鉛バリスタ用ガラス組成物。1. 1 to 10 parts by weight of cobalt oxide and 1 part of boron oxide to 100 parts by weight of a composition comprising 90 to 97% by weight of bismuth oxide and 3 to 10% by weight of silicon dioxide.
A glass composition for a zinc oxide varistor, containing 5 to 5 parts by weight and 0.5 to 4 parts by weight of silver oxide.
素体と、この素体内に拡散させた請求項１記載のガラス
組成物と、この素体の外部に形成された電極とを備えた
酸化亜鉛バリスタ。2. An element body made of a sintered body containing zinc oxide as a main component, the glass composition according to claim 1 diffused in the element body, and an electrode formed outside the element body. Zinc oxide varistor equipped.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3035392A JPH0742135B2 (en) | 1991-02-05 | 1991-02-05 | Glass composition for zinc oxide varistor and zinc oxide varistor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3035392A JPH0742135B2 (en) | 1991-02-05 | 1991-02-05 | Glass composition for zinc oxide varistor and zinc oxide varistor |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH04254437A JPH04254437A (en) | 1992-09-09 |
| JPH0742135B2 true JPH0742135B2 (en) | 1995-05-10 |
Family
ID=12440645
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP3035392A Expired - Fee Related JPH0742135B2 (en) | 1991-02-05 | 1991-02-05 | Glass composition for zinc oxide varistor and zinc oxide varistor |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0742135B2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5439852A (en) * | 1994-08-01 | 1995-08-08 | E. I. Du Pont De Nemours And Company | Cadmium-free and lead-free thick film conductor composition |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5173282A (en) * | 1974-12-20 | 1976-06-24 | Matsushita Electric Ind Co Ltd | SANKAAENDENATSUHICHOKUSENTEIKOTAIYODENKYOKUZAIRYO |
| JPS531891A (en) * | 1976-06-28 | 1978-01-10 | Matsushita Electric Ind Co Ltd | Electrode material for voltage non-linearity resistor |
| JPS5388999A (en) * | 1977-01-17 | 1978-08-04 | Matsushita Electric Ind Co Ltd | Electrode material applied for voltage non-linear resistance body |
-
1991
- 1991-02-05 JP JP3035392A patent/JPH0742135B2/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5173282A (en) * | 1974-12-20 | 1976-06-24 | Matsushita Electric Ind Co Ltd | SANKAAENDENATSUHICHOKUSENTEIKOTAIYODENKYOKUZAIRYO |
| JPS531891A (en) * | 1976-06-28 | 1978-01-10 | Matsushita Electric Ind Co Ltd | Electrode material for voltage non-linearity resistor |
| JPS5388999A (en) * | 1977-01-17 | 1978-08-04 | Matsushita Electric Ind Co Ltd | Electrode material applied for voltage non-linear resistance body |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH04254437A (en) | 1992-09-09 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CA1092251A (en) | Ceramic electrical resistor with nonlinear voltage characteristic | |
| CA1061472A (en) | Voltage-dependent resistor | |
| JPH0742135B2 (en) | Glass composition for zinc oxide varistor and zinc oxide varistor | |
| JPH0733261B2 (en) | Glass composition for zinc oxide varistor and zinc oxide varistor | |
| JPH08718B2 (en) | Glass composition for zinc oxide varistor and zinc oxide varistor | |
| JPH0897011A (en) | Electrode material for zinc oxide varistor | |
| JPH04139702A (en) | Voltage-dependent nonlinear resistor | |
| JPS6221242B2 (en) | ||
| JPS626325B2 (en) | ||
| JPH1197217A (en) | Manufacture of voltage-nonlinear resistor for low voltage | |
| JP3317015B2 (en) | Zinc oxide varistor | |
| JP3089370B2 (en) | Voltage non-linear resistance composition | |
| JP3089371B2 (en) | Voltage non-linear resistance composition | |
| JP2715718B2 (en) | Voltage non-linear resistor | |
| JP2970179B2 (en) | Electrode material for zinc oxide varistor | |
| JP2765070B2 (en) | Varistor | |
| JP2715717B2 (en) | Voltage non-linear resistor | |
| JPH0732085B2 (en) | Electrode material for voltage nonlinear resistors | |
| CA1036346A (en) | Resistor composition | |
| JPH0732087B2 (en) | Electrode material for voltage nonlinear resistors | |
| JPH0812804B2 (en) | Voltage nonlinear resistor | |
| JPH04175259A (en) | Voltage-nonlinear resistance ceramic composition | |
| JPH0732086B2 (en) | Electrode material for voltage nonlinear resistors | |
| JPS62290104A (en) | Electrode material for voltage nonlinear resistance unit | |
| JPH0214763B2 (en) |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| A01 | Written decision to grant a patent or to grant a registration (utility model) |
Free format text: JAPANESE INTERMEDIATE CODE: A01 Effective date: 19951107 |
|
| R250 | Receipt of annual fees |
Free format text: JAPANESE INTERMEDIATE CODE: R250 |
|
| R250 | Receipt of annual fees |
Free format text: JAPANESE INTERMEDIATE CODE: R250 |
|
| R250 | Receipt of annual fees |
Free format text: JAPANESE INTERMEDIATE CODE: R250 |
|
| R250 | Receipt of annual fees |
Free format text: JAPANESE INTERMEDIATE CODE: R250 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20090510 Year of fee payment: 14 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20100510 Year of fee payment: 15 |
|
| LAPS | Cancellation because of no payment of annual fees |