JPH0546681B2 - - Google Patents
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- Publication number
- JPH0546681B2 JPH0546681B2 JP60184387A JP18438785A JPH0546681B2 JP H0546681 B2 JPH0546681 B2 JP H0546681B2 JP 60184387 A JP60184387 A JP 60184387A JP 18438785 A JP18438785 A JP 18438785A JP H0546681 B2 JPH0546681 B2 JP H0546681B2
- Authority
- JP
- Japan
- Prior art keywords
- srtio
- mol parts
- firing
- parts
- powder
- 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
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- 239000000203 mixture Substances 0.000 claims description 15
- 229910002367 SrTiO Inorganic materials 0.000 claims description 13
- 238000010304 firing Methods 0.000 claims description 11
- 229910052573 porcelain Inorganic materials 0.000 claims description 10
- 229910021193 La 2 O 3 Inorganic materials 0.000 claims description 4
- 229910010413 TiO 2 Inorganic materials 0.000 claims description 4
- 229910004298 SiO 2 Inorganic materials 0.000 claims description 3
- 229910015902 Bi 2 O 3 Inorganic materials 0.000 claims description 2
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 claims 2
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims 1
- 229910000019 calcium carbonate Inorganic materials 0.000 claims 1
- 235000010216 calcium carbonate Nutrition 0.000 claims 1
- 229910052593 corundum Inorganic materials 0.000 claims 1
- 229910001845 yogo sapphire Inorganic materials 0.000 claims 1
- 239000000843 powder Substances 0.000 description 9
- 239000000919 ceramic Substances 0.000 description 4
- 239000002994 raw material Substances 0.000 description 4
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000001590 oxidative effect Effects 0.000 description 2
- 229910052709 silver Inorganic materials 0.000 description 2
- 239000004332 silver Substances 0.000 description 2
- 229910018072 Al 2 O 3 Inorganic materials 0.000 description 1
- -1 Sb 2 O 5 Inorganic materials 0.000 description 1
- 239000011230 binding agent Substances 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 239000011812 mixed powder Substances 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
- 238000005303 weighing Methods 0.000 description 1
Landscapes
- Compositions Of Oxide Ceramics (AREA)
- Thermistors And Varistors (AREA)
Description
〔産業上の利用分野〕
この発明は、静電容量を有するバリスタ用の
SrTiO3系磁器組成物に関する。
〔従来の技術〕
従来、静電容量を有するバリスタ用磁器組成物
は、SrTiO3を主成分とし、少量のNb2O5,SiO2
等を含む磁器原料を、少量の水素ガスを含む窒素
ガス中等の非酸化雰囲気において、1300〜1450℃
の温度で焼成し、さらに空気中において1000℃前
後の温度で焼成して作られたものである。
この磁器組成物を使用して作られたバリスタの
特性は、例えば直径8.4mm、厚さ1.0mmの円板形に
成形された磁器の両主面に、銀電極を設けたもの
では、バリスタ電圧V1が120〜550V、非直線指
数αが10〜13、静電容量が1〜5nFであつた。
〔発明が解決しようとする問題点〕
上記従来の磁器組成物は、原料を非酸化雰囲気
中で焼成した後に、空気中で焼成するという二度
の焼成工程を経て得られる。
この種の磁器組成物はこうした焼成に伴う生産
性の低さが問題となり改善が要望されていた。
この発明は、従来の静電容量を有するバリスタ
用SrTiO3系磁器組成物の上記問題点を解決すべ
くなされたもので、その目的は、焼成の工程にお
ける生産性の高い静電容量を有するバリスタ用磁
器組成物を提供することにある。
〔問題を解決するための手段〕
この発明による磁器組成物は、SrTiO3(第一成
分)が100モル部と、La2O3,Y2O3のグループか
ら選ばれた1種以上(第二成分)が0.05〜7.75モ
ル部と、TiO2(第三成分)が上記第二成分より
0.01〜2.25多いモル部と、SiO2,Sb2O5,Bi2O3の
グループから選ばれた1種以上(第四成分)が
0.01〜3.25モル部と、Ag(第五成分)が0.01〜0.5
モル部と、CuO,NiO,CoO,ZnO,Al2O3,
CaCO3から選ばれた1種以上の成分(第六成分)
が0.01〜1.25モル部とからなる混合物を空気中で
焼成してなるものである。
〔実施例〕
次に、この発明の実施例について説明する。
まず、純度99.5%のSrCO3粉末を147.62g、純度
99.5%のTiO2粉末を79.90gずつ秤量し、これをボ
ールミルに10時間かけて攪拌混合した。続いてこ
の混合粉末に1180℃の温度に2時間加えて仮焼し
た後、再びボールミルに8時間かけて粉砕し、
SrTiO3粉末を作つた。
次に、上記SrTiO3粉末を183.52g、純度99.9%
のLa2O3粉末を0.163g(SrTiO3100モル部に対して
0.05モル部相当)、純度99.9%のTiO2粉末を1.84g
(SrTiO3100モル部に対して2.3モル部相当)、純
度99.0%のSb2O5粉末を0.324g(SrTiO3100モル部
に対して0.1モル部相当)、純度99.0%のAg粉末を
0.270g(SrTiO3100モル部に対して0.25モル部相
当)及び純度99.0%のZnO粉末を0.57g(SrTiO3
100モル部に対して0.7モル部相当)ずつ秤量し
た。これらを擂漬器に20時間かけて攪拌し、混合
した。
上記混合物にバインダを加えて造粒した後、こ
れを直径10mm、厚さ1.2mmの円板形に加圧成形し
た。次いでこの成形物を空気中で、常温から1300
℃〜1450℃の温度に加熱し、この温度を4時間維
持した後、冷却するという全所要時間約12時間の
プロフイルで焼成した。こうして作られた円板形
の磁器組成物は、直径約8.4mm、厚さ約1.0mmであ
つた。
次に、上記磁器円板の両主面に直径8.0mmの円
形に銀ペーストを塗布し、これを750℃の温度で
焼き付け、電極を設けた。これを試料15とした。
さらに下表の試料1〜14及び同16〜20について
も、それぞれの欄に示す組成となるように各成分
を秤量して混合し、上記試料15と同様にして製作
した。
これら各試料について、電流I1=0.1mAのとき
の電極間の電圧、即ちバリスタ電圧V1を測定し、
さらに電流I2=1.0mAのときの電極間の電圧V2を
測定し、これらの値から下の式を用いて電圧非直
線指数αを求めた。また、静電容量Cを周波数
1KHzで測定した。
α=log(I2/I1)/log(V2/V1)
この測定結果のうち、バリスタ電圧V1と電圧
非直線指数αを下表に示した。
下表から明らかな通り、試料1〜20のバリスタ
電圧V1は、123〜546V、電圧非直線指数αは、
10.4〜13.7であつた。静電容量については、下表
に示されていないが、1〜5nFであつた。
[Industrial Application Field] The present invention is applicable to varistors having capacitance.
This invention relates to a SrTiO 3 based ceramic composition. [Prior Art] Conventionally, ceramic compositions for varistors with capacitance have SrTiO 3 as the main component, with small amounts of Nb 2 O 5 and SiO 2
The porcelain raw materials containing the
It is made by firing at a temperature of 1000°C and then firing it in air at a temperature of around 1000°C. The characteristics of a varistor made using this porcelain composition are, for example, when silver electrodes are provided on both main surfaces of porcelain formed into a disk shape with a diameter of 8.4 mm and a thickness of 1.0 mm, the varistor voltage V 1 was 120 to 550 V, nonlinear index α was 10 to 13, and capacitance was 1 to 5 nF. [Problems to be Solved by the Invention] The above-mentioned conventional porcelain composition is obtained through two firing steps: firing the raw material in a non-oxidizing atmosphere and then firing it in air. This type of porcelain composition has a problem of low productivity due to firing, and improvements have been desired. This invention was made to solve the above-mentioned problems of the conventional SrTiO 3 ceramic composition for varistors with capacitance. An object of the present invention is to provide a porcelain composition for use. [Means for solving the problem] The ceramic composition according to the present invention contains 100 mol parts of SrTiO 3 (first component) and one or more selected from the group of La 2 O 3 and Y 2 O 3 (first component). 2 components) is 0.05 to 7.75 mole parts, and TiO 2 (third component) is more than the above second component.
0.01 to 2.25 more molar parts and one or more selected from the group of SiO 2 , Sb 2 O 5 , Bi 2 O 3 (fourth component)
0.01 to 3.25 mole parts and 0.01 to 0.5 Ag (fifth component)
Molar part and CuO, NiO, CoO, ZnO, Al 2 O 3 ,
One or more components selected from CaCO 3 (sixth component)
is obtained by firing a mixture of 0.01 to 1.25 mole parts in air. [Example] Next, an example of the present invention will be described. First, 147.62g of SrCO 3 powder with purity of 99.5%, purity
79.90 g of 99.5% TiO 2 powder was weighed out and mixed by stirring in a ball mill for 10 hours. Next, this mixed powder was calcined at a temperature of 1180℃ for 2 hours, and then ground again in a ball mill for 8 hours.
SrTiO 3 powder was made. Next, 183.52g of the above SrTiO 3 powder, purity 99.9%
0.163 g of La 2 O 3 powder (per 100 mole parts of SrTiO 3
1.84 g of TiO 2 powder with a purity of 99.9% (equivalent to 0.05 mole part)
(equivalent to 2.3 mol parts per 100 mol parts of SrTiO 3 ), 0.324 g of Sb 2 O 5 powder with a purity of 99.0% (equivalent to 0.1 mol parts per 100 mol parts of SrTiO 3 ), and Ag powder with a purity of 99.0%.
0.270g (equivalent to 0.25 mol parts per 100 mol parts of SrTiO 3 ) and 0.57 g (corresponding to 0.25 mol parts per 100 mol parts of SrTiO 3 ) of ZnO powder with a purity of 99.0% (SrTiO 3
(corresponding to 0.7 mol parts per 100 mol parts). These were stirred and mixed in a pickler for 20 hours. After adding a binder to the above mixture and granulating it, this was pressure-molded into a disk shape with a diameter of 10 mm and a thickness of 1.2 mm. Next, this molded product is heated in air from room temperature to 1300°C.
The firing profile consisted of heating to a temperature of 1450°C to 1450°C, maintaining this temperature for 4 hours, and then cooling for a total time of about 12 hours. The disk-shaped porcelain composition thus produced had a diameter of about 8.4 mm and a thickness of about 1.0 mm. Next, silver paste was applied to both main surfaces of the porcelain disk in a circular shape with a diameter of 8.0 mm, and this was baked at a temperature of 750° C. to provide electrodes. This was designated as sample 15. Furthermore, Samples 1 to 14 and Samples 16 to 20 in the table below were manufactured in the same manner as Sample 15 by weighing and mixing each component so as to have the composition shown in each column. For each of these samples, measure the voltage between the electrodes when the current I 1 = 0.1 mA, that is, the varistor voltage V 1 ,
Furthermore, the voltage V 2 between the electrodes when the current I 2 =1.0 mA was measured, and the voltage nonlinearity index α was determined from these values using the formula below. Also, the capacitance C is expressed as the frequency
Measured at 1KHz. α=log(I 2 /I 1 )/log(V 2 /V 1 ) Among the measurement results, the varistor voltage V 1 and the voltage non-linearity index α are shown in the table below. As is clear from the table below, the varistor voltage V 1 of samples 1 to 20 is 123 to 546V, and the voltage nonlinearity index α is
It was between 10.4 and 13.7. Although the capacitance is not shown in the table below, it was 1 to 5 nF.
【表】【table】
以上説明した通り、この発明によれば、従来の
ように原料を非酸化雰囲気と空気中の2度にわた
つて焼成することなく、空気中で1度焼成するだ
けで、静電容量を有するバリスタ用磁器組成物を
提供できる効果がある。
As explained above, according to the present invention, a varistor with capacitance can be produced by firing the raw material once in air, instead of firing the raw material twice in a non-oxidizing atmosphere and in air as in the past. This has the effect of providing a porcelain composition for use.
Claims (1)
ープから選ばれた1種以上が0.05〜7.75モル部
と、TiO2がLa2O3,Y2O3のグループから選ばれ
た上記成分より0.01〜2.25多いモル部と、SiO2,
Sb2O5,Bi2O3のグループから選ばれた1種以上
が0.01〜3.25モル部と、Agが0.01〜0.5モル部と、
CuO,NiO,CoO,ZnO,Al2O3,CaCO3から選
ばれた1種以上が0.01〜1.25モル部とからなる混
合物を空気中で焼成してなるバリスタ用磁器組成
物。1 SrTiO 3 is 100 mol parts, one or more selected from the group of La 2 O 3 and Y 2 O 3 is 0.05 to 7.75 mol parts, and TiO 2 is from the group of La 2 O 3 and Y 2 O 3 0.01 to 2.25 molar parts more than the selected above components, and SiO 2 ,
0.01 to 3.25 mol parts of one or more selected from the group of Sb 2 O 5 and Bi 2 O 3 , and 0.01 to 0.5 mol parts of Ag;
A porcelain composition for a varistor obtained by firing in air a mixture comprising 0.01 to 1.25 mole parts of one or more selected from CuO, NiO, CoO, ZnO, Al2O3 , and CaCO3 .
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP60184387A JPS6243106A (en) | 1985-08-21 | 1985-08-21 | Ceramic composition for varistor |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP60184387A JPS6243106A (en) | 1985-08-21 | 1985-08-21 | Ceramic composition for varistor |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS6243106A JPS6243106A (en) | 1987-02-25 |
JPH0546681B2 true JPH0546681B2 (en) | 1993-07-14 |
Family
ID=16152291
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP60184387A Granted JPS6243106A (en) | 1985-08-21 | 1985-08-21 | Ceramic composition for varistor |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS6243106A (en) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN102807364B (en) * | 2012-09-06 | 2014-07-23 | 山东国瓷功能材料股份有限公司 | Tau-f-adjustable high-Q-value microwave medium material |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS60136205A (en) * | 1983-12-23 | 1985-07-19 | 松下電器産業株式会社 | Voltage dependent nonlinear resistor porcelain composition |
-
1985
- 1985-08-21 JP JP60184387A patent/JPS6243106A/en active Granted
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS60136205A (en) * | 1983-12-23 | 1985-07-19 | 松下電器産業株式会社 | Voltage dependent nonlinear resistor porcelain composition |
Also Published As
Publication number | Publication date |
---|---|
JPS6243106A (en) | 1987-02-25 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
LAPS | Cancellation because of no payment of annual fees |