JPS6316882B2 - - Google Patents
Info
- Publication number
- JPS6316882B2 JPS6316882B2 JP1267382A JP1267382A JPS6316882B2 JP S6316882 B2 JPS6316882 B2 JP S6316882B2 JP 1267382 A JP1267382 A JP 1267382A JP 1267382 A JP1267382 A JP 1267382A JP S6316882 B2 JPS6316882 B2 JP S6316882B2
- Authority
- JP
- Japan
- Prior art keywords
- pot
- diameter
- zirconia
- agate
- cobblestone
- 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
- MCMNRKCIXSYSNV-UHFFFAOYSA-N Zirconium dioxide Chemical compound O=[Zr]=O MCMNRKCIXSYSNV-UHFFFAOYSA-N 0.000 claims description 26
- 239000002994 raw material Substances 0.000 claims description 13
- 238000010298 pulverizing process Methods 0.000 claims description 11
- 239000000843 powder Substances 0.000 claims description 9
- 238000001354 calcination Methods 0.000 claims description 8
- 229910002113 barium titanate Inorganic materials 0.000 claims description 5
- JRPBQTZRNDNNOP-UHFFFAOYSA-N barium titanate Chemical compound [Ba+2].[Ba+2].[O-][Ti]([O-])([O-])[O-] JRPBQTZRNDNNOP-UHFFFAOYSA-N 0.000 claims description 5
- 238000004519 manufacturing process Methods 0.000 claims description 5
- 229920006122 polyamide resin Polymers 0.000 claims description 4
- 239000000463 material Substances 0.000 claims description 3
- 239000004065 semiconductor Substances 0.000 claims description 2
- 238000000034 method Methods 0.000 claims 1
- 238000005245 sintering Methods 0.000 claims 1
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 10
- 230000000694 effects Effects 0.000 description 7
- 239000000203 mixture Substances 0.000 description 5
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 description 4
- 238000005299 abrasion Methods 0.000 description 4
- 239000012535 impurity Substances 0.000 description 4
- 229910010413 TiO 2 Inorganic materials 0.000 description 2
- 230000002411 adverse Effects 0.000 description 2
- 238000002474 experimental method Methods 0.000 description 2
- 238000010304 firing Methods 0.000 description 2
- 239000008188 pellet Substances 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 229910004298 SiO 2 Inorganic materials 0.000 description 1
- AYJRCSIUFZENHW-UHFFFAOYSA-L barium carbonate Chemical group [Ba+2].[O-]C([O-])=O AYJRCSIUFZENHW-UHFFFAOYSA-L 0.000 description 1
- 239000011362 coarse particle Substances 0.000 description 1
- 238000011109 contamination Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 239000011164 primary particle Substances 0.000 description 1
Landscapes
- Thermistors And Varistors (AREA)
Description
【発明の詳細な説明】
本発明は過大な電流が流れるに伴つて高抵抗に
なつて電流を阻止し、しや断器等の作動による電
流しや断後に通常の低抵抗に戻る限流素子の製造
方法に関する。DETAILED DESCRIPTION OF THE INVENTION The present invention is a current-limiting element that becomes high in resistance as an excessive current flows, blocks the current, and returns to normal low resistance after the current is interrupted by the operation of a shield breaker or the like. Relating to a manufacturing method.
限流素子として代表される大電流用正温度係数
（PTC）サーミスタは、その好ましい特性として
抵抗の正温度係数が十分大きいこと及び常温での
比抵抗が十分小さいことが上げられる。PTCサ
ーミスタは例えばチタン酸バリウム系半導体粉末
に金属粉末を混合して焼成することにより実現さ
れる。 A large current positive temperature coefficient (PTC) thermistor, which is typically used as a current limiting element, has desirable characteristics such as a sufficiently large positive temperature coefficient of resistance and a sufficiently small specific resistance at room temperature. A PTC thermistor is realized, for example, by mixing barium titanate semiconductor powder with metal powder and firing the mixture.
チタン酸バリウムは炭酸バリウム（BaCO3）
とチタニア（TiO2）とを等モル比になるよう原
料の重量比を計算し、これを秤量配合（調合）
し、ポツト内に適量の玉石と水と共に入れて該ポ
ツトを回転駆動することにより粉砕と混合して得
る。しかし、ポツトの回転中、玉石とポツトの内
壁又は玉石同志の衝突により玉石及びポツト内壁
の磨耗を起し、これが不純物となつてBaTiO3原
料中に混入し、焼成後の電気特性に悪影響を及ぼ
していた。ポツト中での磨耗はポツト内壁の磨耗
よりも玉石分の方が多く、不純物の混入を少なく
するよう良質の玉石として一般には“めのう”が
使用されている。 Barium titanate is barium carbonate (BaCO 3 )
Calculate the weight ratio of the raw materials to have an equimolar ratio of titania (TiO 2 ) and titania (TiO 2 ), and weigh and blend (mix)
Then, by putting an appropriate amount of cobblestones and water into a pot and rotating the pot, they are mixed with pulverization. However, during the rotation of the pot, the cobblestones and the inner wall of the pot collide with each other, causing abrasion of the cobblestones and the inner wall of the pot.This becomes an impurity and mixes into the BaTiO 3 raw material, which adversely affects the electrical properties after firing. was. Abrasion caused by the cobblestones in the pot is greater than abrasion of the inner wall of the pot, and "agate" is generally used as a high-quality cobblestone to reduce contamination with impurities.
この“めのう”の玉石は、ポツトでの試料の粉
砕混合のほかに、BaTiO3原料を仮焼した後の粉
末化のための粉砕にも使用する。この仮焼と粉砕
について説明すると、仮焼は原料組成の均一化を
図るもので、仮焼終了後に原料を粉砕して一次粒
子を得るにはスタンパやクラツシヤによる粉砕を
施し、その後ふるいを通して粗い粒子を除去しボ
ールミルにより微粉末にする。このボールミルに
も上述の“めのう”を使用し、“めのう”の磨耗
分が不純物として原料に混入し、製品の電気特性
に悪影響を及ぼす。 These "agate" boulders are used not only for pulverizing and mixing samples in the pot, but also for pulverizing the BaTiO 3 raw material after calcining it into powder. To explain this calcination and pulverization, calcination aims to make the raw material composition uniform. After calcination, the raw material is pulverized to obtain primary particles by pulverization with a stamper or crusher, and then passed through a sieve to produce coarse particles. is removed and made into a fine powder using a ball mill. The above-mentioned "agate" is also used in this ball mill, and the abrasions of the "agate" mix into the raw material as impurities and adversely affect the electrical properties of the product.
本発明は、上述までの事情に鑑みてなされたも
ので、ポリアミド系樹脂のポツトを使用し、玉石
として５〜16mmφのジルコニアボールを使用する
ことにより、ポツトでの原料の粉砕、混合及びボ
ールミルでの微粉末化に不純物の混入を低減した
製造方法を提供することを目的とする。 The present invention has been made in view of the above-mentioned circumstances, and uses a pot made of polyamide resin and zirconia balls with a diameter of 5 to 16 mm as cobblestones. The object of the present invention is to provide a manufacturing method that reduces the amount of impurities mixed into the powder.
本発明に基づいた実験として、玉石に従来の
“めのう”を使う場合とジルコニアを使う場合、
また玉石の直径がチタン酸バリウムによる限流素
子製造でのPTC効果に及ぼす影響について実験
した。 As an experiment based on the present invention, when using conventional "agate" for the cobblestone and when using zirconia,
We also conducted an experiment to examine the effect of the diameter of the cobblestone on the PTC effect in manufacturing current limiting elements using barium titanate.
まず、実験条件として、“めのう”は８mmφの
もの、ジルコニアの焼成ペレツト８mmφのものを
用意し、各玉石を使用して内容積４のポリアミ
ド系樹脂のポツト中にBaTiO3粗粉末500ｇと同
容量の水を入れて12時間粉砕した。こうした条件
での原料試作を施し、夫々の原料は仮焼後の粉砕
にも同じ玉石を使用して微粉末を得て焼結した限
流素子についてPTC効果は図示のものになつた。 First, as the experimental conditions, we prepared "agate" of 8 mm diameter and calcined zirconia pellets of 8 mm diameter, and using each cobblestone, we placed the same volume as 500 g of BaTiO 3 coarse powder in a polyamide resin pot with an internal volume of 4. of water and ground for 12 hours. Prototypes of raw materials were produced under these conditions, and the same cobblestones were used for pulverization after calcination of each raw material to obtain fine powder, which was then sintered.The PTC effect was as shown in the figure.
図中、曲線Ａは玉石として“めのう”を使用し
た場合の温度−比抵抗特性を示し、曲線Ｂはジル
コニアを使用した場合である。特性ＡとＢの比較
から明らかなように、ジルコニアの玉石を使用す
る場合は常温での抵抗が“めのう”の場合よりも
50倍ほど低くなり、限流素子として優れる。これ
は、“めのう”を玉石とする曲線Ａの場合には
“めのう”の成分である抵抗の高いSiO2が
BaTiO3中に多量に混入した結果と考えられる。 In the figure, curve A shows the temperature-resistivity characteristic when "agate" is used as the boulder, and curve B shows the temperature-resistivity characteristic when zirconia is used. As is clear from the comparison of characteristics A and B, when using zirconia cobblestone, the resistance at room temperature is higher than when using agate.
It is about 50 times lower, making it an excellent current limiting element. This means that in the case of curve A where "agate" is used as a cobblestone, SiO 2 with high resistance, which is a component of "agate", is
This is thought to be the result of a large amount being mixed into BaTiO 3 .
なお、ジルコニアの焼成ペレツトの径として、
２mmφ、20mmφのものを使用して上述の実験条件
で粉砕処理を施し、焼結した素子についての
PTC効果を調べると、径が８mmφのジルコニア
の場合が最もPTC効果が顕著に現われた。これ
は、２mmφのジルコニアでは軽過ぎてポツト内で
玉石が最上部まで上がつた後落下し、再び粉砕の
ために下部に進む浮き上り現象で原料の粉砕効率
が悪くなると考えられる。また、20mmφのジルコ
ニアでは大き過ぎて玉石同志の原料を間にした衝
突回数、衝突面が少なくなつて粉砕効率が悪くな
ると考えられる。この径についてはジルコニアを
玉石とするにしても５mmφ乃至16mmφの範囲のも
のにして素子のPTC効果に良好な特性を得るこ
とができた。 In addition, as the diameter of the fired zirconia pellets,
We used 2mmφ and 20mmφ devices, which were pulverized and sintered under the experimental conditions described above.
When examining the PTC effect, it was found that the PTC effect was most pronounced in the case of zirconia with a diameter of 8 mm. This is because zirconia with a diameter of 2 mm is too light, and the boulder rises to the top in the pot, falls down, and moves to the bottom for pulverization again, resulting in a floating phenomenon that reduces the efficiency of pulverizing the raw material. In addition, zirconia with a diameter of 20 mm is too large, and it is thought that the number of collisions between the raw materials of the boulders and the collision surface will be reduced, resulting in poor pulverization efficiency. Regarding this diameter, even if zirconia is used as the cobblestone, it is within the range of 5 mmφ to 16 mmφ, and good characteristics can be obtained for the PTC effect of the element.
以上のとおり、本発明によれば、ポツトと玉石
による原料製造及び原料仮焼後の微粉砕に玉石と
してジルコニアボールを使用し、ポツトにはポリ
アミド系樹脂を使用することにより、常温で抵抗
が低くしかもPTC効果の大きくなるチタン酸バ
リウム粉末材料を得ることができる。 As described above, according to the present invention, zirconia balls are used as the cobbles for raw material production using pots and cobblestones, and for fine pulverization after calcining the raw materials, and polyamide resin is used for the pots, so that the resistance is low at room temperature. Moreover, a barium titanate powder material with a large PTC effect can be obtained.
図面は本発明に基づいた実験結果を示す限流素
子の温度−比抵抗特性図である。
The drawing is a temperature-resistivity characteristic diagram of a current limiting element showing experimental results based on the present invention.
Claims (1)
焼後の微粉末を焼結して限流素子を製造するにお
いて、上記原料の生成のためのポツトにポリアミ
ド系樹脂を使用して玉石として５mm径乃至16mm径
のジルコニアボールを使用し、仮焼後のボールミ
ルでの原料粉砕に上記ジルコニアボールと同じも
のを使用することを特徴とする限流素子の製造方
法。1. In producing a barium titanate-based semiconductor material and sintering the fine powder after calcination to produce a current limiting element, a polyamide resin is used in a pot for producing the above-mentioned material, and a cobblestone with a diameter of 5 mm or more is used. A method for manufacturing a current limiting element, characterized in that zirconia balls with a diameter of 16 mm are used, and the same zirconia balls as described above are used for pulverizing the raw material in a ball mill after calcination.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1267382A JPS58130507A (en) | 1982-01-29 | 1982-01-29 | Method of producing current limiting element |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1267382A JPS58130507A (en) | 1982-01-29 | 1982-01-29 | Method of producing current limiting element |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS58130507A JPS58130507A (en) | 1983-08-04 |
| JPS6316882B2 true JPS6316882B2 (en) | 1988-04-11 |
Family
ID=11811886
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1267382A Granted JPS58130507A (en) | 1982-01-29 | 1982-01-29 | Method of producing current limiting element |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS58130507A (en) |
-
1982
- 1982-01-29 JP JP1267382A patent/JPS58130507A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS58130507A (en) | 1983-08-04 |
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