JPS62162Y2 - - Google Patents
Info
- Publication number
- JPS62162Y2 JPS62162Y2 JP12815480U JP12815480U JPS62162Y2 JP S62162 Y2 JPS62162 Y2 JP S62162Y2 JP 12815480 U JP12815480 U JP 12815480U JP 12815480 U JP12815480 U JP 12815480U JP S62162 Y2 JPS62162 Y2 JP S62162Y2
- Authority
- JP
- Japan
- Prior art keywords
- electrode
- silver
- baked
- varistor
- carbon
- 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
- 229910052709 silver Inorganic materials 0.000 claims description 30
- 239000004332 silver Substances 0.000 claims description 30
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 claims description 29
- 229910052799 carbon Inorganic materials 0.000 claims description 10
- 239000000919 ceramic Substances 0.000 claims description 10
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 9
- WABPQHHGFIMREM-UHFFFAOYSA-N lead(0) Chemical compound [Pb] WABPQHHGFIMREM-UHFFFAOYSA-N 0.000 claims description 9
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N Iron oxide Chemical compound [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 claims description 6
- XLOMVQKBTHCTTD-UHFFFAOYSA-N Zinc monoxide Chemical compound [Zn]=O XLOMVQKBTHCTTD-UHFFFAOYSA-N 0.000 claims description 6
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 claims description 3
- JRPBQTZRNDNNOP-UHFFFAOYSA-N barium titanate Chemical compound [Ba+2].[Ba+2].[O-][Ti]([O-])([O-])[O-] JRPBQTZRNDNNOP-UHFFFAOYSA-N 0.000 claims description 3
- 229910002113 barium titanate Inorganic materials 0.000 claims description 3
- OGIDPMRJRNCKJF-UHFFFAOYSA-N titanium oxide Inorganic materials [Ti]=O OGIDPMRJRNCKJF-UHFFFAOYSA-N 0.000 claims description 3
- 239000011787 zinc oxide Substances 0.000 claims description 3
- 230000015572 biosynthetic process Effects 0.000 claims 1
- 229910000679 solder Inorganic materials 0.000 description 16
- 230000006866 deterioration Effects 0.000 description 4
- 230000007797 corrosion Effects 0.000 description 3
- 238000005260 corrosion Methods 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 230000005611 electricity Effects 0.000 description 2
- 230000020169 heat generation Effects 0.000 description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 239000002075 main ingredient Substances 0.000 description 2
- 229910044991 metal oxide Inorganic materials 0.000 description 2
- 150000004706 metal oxides Chemical class 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 238000007650 screen-printing Methods 0.000 description 2
- 238000005245 sintering Methods 0.000 description 2
- 229910018072 Al 2 O 3 Inorganic materials 0.000 description 1
- 229910015902 Bi 2 O 3 Inorganic materials 0.000 description 1
- 229910052684 Cerium Inorganic materials 0.000 description 1
- 229910005191 Ga 2 O 3 Inorganic materials 0.000 description 1
- -1 Ge) Chemical class 0.000 description 1
- 229910021193 La 2 O 3 Inorganic materials 0.000 description 1
- 229910018068 Li 2 O Inorganic materials 0.000 description 1
- 229910004298 SiO 2 Inorganic materials 0.000 description 1
- 229910006404 SnO 2 Inorganic materials 0.000 description 1
- 229910010413 TiO 2 Inorganic materials 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- 229910052788 barium Inorganic materials 0.000 description 1
- 229910052793 cadmium Inorganic materials 0.000 description 1
- 150000001721 carbon Chemical class 0.000 description 1
- 229910052804 chromium Inorganic materials 0.000 description 1
- 239000007772 electrode material Substances 0.000 description 1
- 230000003628 erosive effect Effects 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 229910052749 magnesium Inorganic materials 0.000 description 1
- 229910052748 manganese Inorganic materials 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 150000003378 silver Chemical class 0.000 description 1
- 238000005476 soldering Methods 0.000 description 1
- 229910052718 tin Inorganic materials 0.000 description 1
- 229910052727 yttrium Inorganic materials 0.000 description 1
- 229910052725 zinc Inorganic materials 0.000 description 1
- 239000011701 zinc Substances 0.000 description 1
- 229910052726 zirconium Inorganic materials 0.000 description 1
Landscapes
- Thermistors And Varistors (AREA)
- Details Of Resistors (AREA)
Description
【考案の詳細な説明】
本考案は電極を改良したセラミツクバリスタに
関する。[Detailed Description of the Invention] The present invention relates to a ceramic varistor with improved electrodes.
従来、酸化亜鉛、酸化チタン、酸化鉄、チタン
酸バリウムなどを主成分としこれに他の金属酸化
物を数種類混合した粉体を高温で焼結したセラミ
ツクバリスタは第１図に示すようにバリスタ素体
１に銀含有率50〜80％のペースト状電極材料をス
クリーン印刷などの方法で塗布しこれを300〜700
℃の温度で焼付け電極２を形成する。該電極２に
はリード線３を当接して溶融ハンダ槽に浸漬しハ
ンダ４で一体に接続する。このような構成になる
電極３は溶融ハンダ槽に浸漬するため電極３の全
面にハンダ４が付着する。このため電極３材料と
してハンダ付性のよい銀ペーストを使用しなけれ
ばならないが前記溶融ハンダは200〜300℃の高温
で溶融しているため電極３全面にこの温度が加わ
り第２図に示すような銀食われ、すなわち電極３
の銀がハンダ４の中に入り込み電極３が部分的に
バリスタ素体１とはなれその部分にハンダ４が侵
入する。しかしながらハンダ４はバリスタ素体１
と密着しないためこの部分のバリスタ素体１に電
極３はもちろんハンダ４とも密着しない欠落部５
が数箇所生ずる。この銀食われ現象によつて前記
欠落部５の部分だけバリスタにおける電極として
機能する電極３面積が減少し、それだけサージ吸
収能力が低下する。したがつて所定のサージを吸
収した場合、電極３の単位面積当たりで吸収する
電気量が大きくなり、ハンダとも密着しない前記
欠落部５に局部発熱が発生する。その結果該欠落
部５からバリスタ素体１の熱劣化が促進されバリ
スタ電圧が低下する。また金属銀は高価であるた
めセラミツクバリスタに占める電極３の材料費の
割合が高いという欠点もある。 Conventionally, ceramic varistors are made by sintering powders containing zinc oxide, titanium oxide, iron oxide, barium titanate, etc. as the main ingredients and a mixture of several other metal oxides at high temperatures, as shown in Figure 1. A paste-like electrode material with a silver content of 50 to 80% is applied to the body 1 by a method such as screen printing, and a 300 to 700%
The baked electrode 2 is formed at a temperature of .degree. A lead wire 3 is brought into contact with the electrode 2, immersed in a molten solder bath, and connected together with solder 4. Since the electrode 3 having such a structure is immersed in a molten solder bath, the solder 4 adheres to the entire surface of the electrode 3. For this reason, silver paste with good solderability must be used as the material for the electrode 3, but since the molten solder is melted at a high temperature of 200 to 300°C, this temperature is applied to the entire surface of the electrode 3, as shown in Figure 2. silver corrosion, i.e. electrode 3
The silver enters into the solder 4, and the electrode 3 is partially separated from the varistor element body 1, and the solder 4 enters into that part. However, solder 4 is varistor body 1
The missing part 5 does not come into close contact with the varistor body 1 in this part, not only with the electrode 3 but also with the solder 4.
occurs in several places. Due to this silver erosion phenomenon, the area of the electrode 3 functioning as an electrode in the varistor is reduced by the portion of the missing portion 5, and the surge absorbing ability is reduced accordingly. Therefore, when a predetermined surge is absorbed, the amount of electricity absorbed per unit area of the electrode 3 increases, and local heat generation occurs in the missing portion 5 that is not in close contact with the solder. As a result, thermal deterioration of the varistor body 1 from the missing portion 5 is accelerated and the varistor voltage is reduced. Furthermore, since metallic silver is expensive, there is also the disadvantage that the material cost of the electrode 3 in the ceramic varistor is high.
本考案は上記のような欠点を除去するためにバ
リスタ素体の電極形成面に帯状の銀ペーストを塗
布し焼付けたのち他の部分にカーボンを塗布して
再び焼付けを行い電極を形成し該電極の銀焼付部
にリード線をハンダ付することによつて、銀食わ
れ現象によるバリスタ素体の熱劣化をなくし、長
期にわたつて特性の安定した安価なセラミツクバ
リスタを提供せんとするものである。 In order to eliminate the above-mentioned drawbacks, the present invention applies a strip of silver paste to the electrode forming surface of the varistor body and bakes it, then applies carbon to other parts and bakes it again to form the electrode. By soldering a lead wire to the silver-baked part of the varistor, the thermal deterioration of the varistor body due to the silver corrosion phenomenon is eliminated, and the purpose is to provide an inexpensive ceramic varistor with stable characteristics over a long period of time. .
以下本考案の一実施例につき図面を参照して詳
細に説明する。第３図および第４図に示すように
酸化亜鉛、酸化チタン、酸化鉄、チタン酸バリウ
ムなどを主成分としこれにMgo，NiO，CaO，
CuO，PbO，CdO，BaO，SrO，MnO，SiO2，
TiO2，SnO2，MnO2，ZrO2，ThO2，Bi2O3，
Sb2O3，Co2O3，Fe2O3，Cr2O3，Al2O3，B2O3，
In2O3，La2O3，Y2O3，Ga2O3，Ta2O5，V2O5，
Nb2O5，Li2O，MoO3，WO3，MeF2（Me＝Ca，
Ba，Cd，Zn，Mg，Mn，Ni，Sn，Zr，Ti，
Ge），MeF2（Me＝Cr，Al，Fe，Ce，Ｙ）など
の金属酸化物を数種類混合してなる混合物をたと
えば板上または柱状に成型しさらにこれを1000〜
1450℃の高温で焼結しバリスタ素体１１を形成す
る。該バリスタ素体１１の電極形成面の略中心部
にスクリーン印刷などの方法により細長く帯状に
銀ペーストを塗布し300〜700℃の温度で焼付を行
い銀焼付部１２を形成する。ついで前記電極形成
面の銀焼付部１２以外の箇所に該銀焼付部１２の
端部と接触させて銀よりもハンダ付性は若干劣る
が電気伝導性のよい材料であるカーボンを塗布し
150〜300℃の温度で焼付けを行いカーボン焼付部
１３を形成する。このカーボン焼付部１３と前記
銀焼付部１２とでもつて電極１４を構成するもの
である。しかして第５図および第６図に示すよう
に該電極１４の一部を構成する前記銀焼付部１２
にリード線１５をハンダ１６で接続するものであ
る。この場合銀焼付部１２は細長く帯状に形成さ
れており電極１４のごく一部分にすぎないためリ
ード線１５をハンダ１６で接続する際に加熱して
も電極１４の全面にわたつて銀食われ現象が発生
することなく、たとえ発生してもハンダ１６付部
分となる銀焼付部１２に１箇所ぐらい生じるだけ
であるからバリスタにおける電極として機能する
電極１４面積の減少はほとんどなく、電極１４単
位面積当たりで吸収する電気量の増大は無視で
き、局部発熱はない。したがつてバリスタ素体１
１の熱劣化現象によるバリスタ電圧の低下はほと
んどなく、安定した特性を長期にわたつて維持で
きる。 Hereinafter, one embodiment of the present invention will be described in detail with reference to the drawings. As shown in Figures 3 and 4, the main ingredients are zinc oxide, titanium oxide, iron oxide, barium titanate, etc., and Mgo, NiO, CaO, etc.
CuO, PbO, CdO, BaO, SrO, MnO, SiO 2 ,
TiO 2 , SnO 2 , MnO 2 , ZrO 2 , ThO 2 , Bi 2 O 3 ,
Sb 2 O 3 , Co 2 O 3 , Fe 2 O 3 , Cr 2 O 3 , Al 2 O 3 , B 2 O 3 ,
In 2 O 3 , La 2 O 3 , Y 2 O 3 , Ga 2 O 3 , Ta 2 O 5 , V 2 O 5 ,
Nb 2 O 5 , Li 2 O, MoO 3 , WO 3 , MeF 2 (Me=Ca,
Ba, Cd, Zn, Mg, Mn, Ni, Sn, Zr, Ti,
A mixture of several types of metal oxides such as Ge), MeF 2 (Me = Cr, Al, Fe, Ce, Y) is molded into a plate or column shape, and further
The varistor body 11 is formed by sintering at a high temperature of 1450°C. A silver paste is applied in a long and thin strip to approximately the center of the electrode forming surface of the varistor body 11 by a method such as screen printing, and baked at a temperature of 300 to 700° C. to form a silver baked portion 12. Next, carbon, which is a material with better electrical conductivity but slightly inferior solderability than silver, is applied to a portion of the electrode forming surface other than the silver baked portion 12 in contact with the end of the silver baked portion 12.
Baking is performed at a temperature of 150 to 300°C to form a carbon baked part 13. This carbon baked portion 13 and the silver baked portion 12 together constitute an electrode 14. As shown in FIGS. 5 and 6, the silver baked portion 12 forming a part of the electrode 14
A lead wire 15 is connected to the lead wire 15 with solder 16. In this case, the silver baked part 12 is formed into a long and narrow band shape and is only a small part of the electrode 14, so even if it is heated when connecting the lead wire 15 with the solder 16, the entire surface of the electrode 14 will be etched away. It does not occur, and even if it does occur, it will only occur in one spot on the silver baked part 12, which is the part where the solder 16 will be attached, so there is almost no reduction in the area of the electrode 14 that functions as an electrode in the varistor, and the area of the electrode 14 is reduced per unit area of the electrode 14. The increase in the amount of electricity absorbed is negligible and there is no local heat generation. Therefore, ballista body 1
There is almost no drop in varistor voltage due to the thermal deterioration phenomenon described in No. 1, and stable characteristics can be maintained over a long period of time.
以上詳述したように本考案によればバリスタ素
体の電極形成面に細長く帯状に銀焼付部を形成し
該銀焼付部以外の箇所に該銀焼付部の端部と接触
させてカーボン焼付部を形成し該カーボン焼付部
と銀焼付部とで電極を構成し、該電極の銀焼付部
にリード線をハンダで接続したことによつて銀焼
付部が細長い帯状に形成されており電極のごく一
部分にすぎないためリード線をハンダで接続する
際に加熱しても電極の全面にわたつて銀食われ現
象が発生することなくバリスタ電圧の熱劣化によ
るバリスタ電圧の低下を防ぎ特性の安定した安価
なセラミツクバリスタを提供することができる。 As described in detail above, according to the present invention, a silver baked part is formed in a long and narrow strip shape on the electrode forming surface of the varistor element body, and a carbon baked part is made in contact with the end of the silver baked part at a location other than the silver baked part. The carbon baked part and the silver baked part constitute an electrode, and a lead wire is connected to the silver baked part of the electrode with solder, so that the silver baked part is formed into a long and narrow strip. Because it is only a part of the electrode, even if it is heated when connecting the lead wire with solder, silver corrosion does not occur over the entire surface of the electrode, preventing the drop in varistor voltage due to thermal deterioration of the varistor voltage, resulting in stable characteristics and low cost. We can provide ceramic varistors with excellent quality.
第１図は従来のセラミツクバリスタを示す断面
図、第２図は従来のセラミツクバリスタの電極を
示す一部拡大断面図、第３図は本考案の一実施例
に係るセラミツクバリスタの電極を示す平面図、
第４図はその断面図、第５図は本考案のセラミツ
クバリスタを示す平面図、第６図はその断面図で
ある。
１１……バリスタ素体、１２……銀焼付部、１
３……カーボン焼付部、１４……電極、１５……
リード線、１６……ハンダ。
FIG. 1 is a sectional view showing a conventional ceramic varistor, FIG. 2 is a partially enlarged sectional view showing an electrode of a conventional ceramic varistor, and FIG. 3 is a plan view showing an electrode of a ceramic varistor according to an embodiment of the present invention. figure,
FIG. 4 is a sectional view thereof, FIG. 5 is a plan view showing the ceramic varistor of the present invention, and FIG. 6 is a sectional view thereof. 11... Varistor body, 12... Silver baked part, 1
3... Carbon baked part, 14... Electrode, 15...
Lead wire, 16...solder.
Claims (1)
ウムなどを主成分とするバリスタ素体と、該バリ
スタ素体の電極形成面に形成した細長い帯状の銀
焼付部と、該銀焼付部の端部と接触させて該銀焼
付部以外の他の電極形成面に形成したカーボン焼
付部と、該カーボン焼付部と前記銀焼付部とから
なる電極と、該電極を構成する前記銀焼付部にハ
ンダ付けしたリード線とを具備したことを特徴と
するセラミツクバリスタ。 A varistor element whose main components are zinc oxide, titanium oxide, iron oxide, barium titanate, etc., an elongated strip-shaped silver baked part formed on the electrode forming surface of the varistor element, and an end of the silver baked part. A carbon baked portion formed on an electrode formation surface other than the silver baked portion in contact with each other; an electrode consisting of the carbon baked portion and the silver baked portion; and a carbon baked portion soldered to the silver baked portion constituting the electrode. A ceramic varistor characterized by being equipped with a lead wire.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP12815480U JPS62162Y2 (en) | 1980-09-08 | 1980-09-08 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP12815480U JPS62162Y2 (en) | 1980-09-08 | 1980-09-08 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5750802U JPS5750802U (en) | 1982-03-24 |
| JPS62162Y2 true JPS62162Y2 (en) | 1987-01-07 |
Family
ID=29488548
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP12815480U Expired JPS62162Y2 (en) | 1980-09-08 | 1980-09-08 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS62162Y2 (en) |
-
1980
- 1980-09-08 JP JP12815480U patent/JPS62162Y2/ja not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5750802U (en) | 1982-03-24 |
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