JPH0869901A - Positive temperature coefficient thermistor - Google Patents
Positive temperature coefficient thermistorInfo
- Publication number
- JPH0869901A JPH0869901A JP6203457A JP20345794A JPH0869901A JP H0869901 A JPH0869901 A JP H0869901A JP 6203457 A JP6203457 A JP 6203457A JP 20345794 A JP20345794 A JP 20345794A JP H0869901 A JPH0869901 A JP H0869901A
- Authority
- JP
- Japan
- Prior art keywords
- temperature coefficient
- positive temperature
- thermistor
- temperature
- resistance
- 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.)
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- Compositions Of Oxide Ceramics (AREA)
- Thermistors And Varistors (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は例えば、温度補償装置、
カラーＴＶ消磁装置、電流制御などの各種スイッチング
素子、あるいは低温発熱体として利用される正特性サー
ミスタに関するものである。The present invention relates to, for example, a temperature compensation device,
The present invention relates to a color TV degaussing device, various switching elements for current control, or a positive temperature coefficient thermistor used as a low temperature heating element.
【０００２】[0002]
【従来の技術】従来、緻密なサーミスタ素子を得るため
に、チタン酸バリウム系半導体磁器にＳｉＯ2等を添加
して結晶粒成長を抑制していた。2. Description of the Related Art Conventionally, in order to obtain a dense thermistor element, crystal grain growth has been suppressed by adding SiO 2 or the like to a barium titanate-based semiconductor ceramic.
【０００３】[0003]
【発明が解決しようとする課題】上記方法では、Ｓｉ化
合物が形成されるため、キュリー温度での結晶変態速度
が遅くなり、キュリー温度直後の正の抵抗温度係数が小
さかった。In the above method, since a Si compound is formed, the rate of crystal transformation at the Curie temperature is slow, and the positive temperature coefficient of resistance immediately after the Curie temperature is small.
【０００４】従って、定温発熱体として利用した場合、
印加電圧が１００Ｖ，２２０Ｖあるいはそれ以上の高電
圧になると電圧依存性を有することとなる。そのため、
１００Ｖの電圧を印加したときと、２２０Ｖの電圧を印
加した場合の正特性サーミスタの動作温度変化が大きく
なり、印加電圧によって正特性サーミスタの発熱量が異
なり、使用する電圧によってサーミスタを替えなければ
ならないという問題点を有していた。Therefore, when used as a constant temperature heating element,
When the applied voltage becomes a high voltage of 100 V, 220 V or higher, it has voltage dependence. for that reason,
The change in operating temperature of the positive temperature coefficient thermistor between when a voltage of 100 V is applied and when a voltage of 220 V is applied becomes large, the amount of heat generated by the positive temperature coefficient thermistor differs depending on the applied voltage, and the thermistor must be changed depending on the voltage used Had the problem.
【０００５】本発明はキュリー温度直後の正の抵抗温度
係数の大きい正特性サーミスタを提供することを目的と
するものである。An object of the present invention is to provide a positive temperature coefficient thermistor having a large positive temperature coefficient of resistance immediately after the Curie temperature.
【０００６】[0006]
【課題を解決するための手段】この目的を達成するため
に本発明は、サーミスタ素子をチタン酸バリウム系半導
体磁器１モルに対してＣａＴｉＯ3を０．０９〜０．１
２５モル含有させたもので構成するものである。In order to achieve this object, the present invention provides a thermistor element containing CaTiO 3 in an amount of 0.09 to 0.1 with respect to 1 mol of barium titanate based semiconductor ceramics.
It is composed of 25 mol.
【０００７】[0007]
【作用】この構成により、Ｃａがチタン酸バリウムのバ
リウムサイト側に置換され、結晶粒子成長を抑制すると
同時にＴｉＯ2が過剰な状態になるため、液相焼結が促
進される。また、従来のようにＳｉＯ2を添加していな
いので、Ｓｉ化合物を形成せずキュリー温度での結晶変
態速度が迅速になると考えられる。その結果、キュリー
温度直後の正の抵抗温度係数の大きい正特性サーミスタ
を提供することができる。With this structure, Ca is substituted on the barium site side of barium titanate, and crystal grain growth is suppressed, and at the same time, TiO 2 is in an excessive state, so that liquid phase sintering is promoted. In addition, since SiO 2 is not added as in the conventional case, it is considered that the Si compound is not formed and the crystal transformation rate at the Curie temperature is increased. As a result, a positive temperature coefficient thermistor having a large positive temperature coefficient of resistance immediately after the Curie temperature can be provided.
【０００８】[0008]
【実施例】以下、本発明の一実施例について説明する。
本実施例に用いた材料組成を（化１）に示している。EXAMPLES An example of the present invention will be described below.
The material composition used in this example is shown in (Chemical Formula 1).
【０００９】[0009]
【化１】 Embedded image
【００１０】この配合組成になるように、市販のＢａＣ
Ｏ3、ＴｉＯ2、ＰｂＯ、Ｙ2Ｏ3、Ａｌ2Ｏ3、Ｍｎ（ＮＯ
3）2及びＣａＴｉＯ3を秤量し、原料１２００ｇを１０
ｌボールミルに入れ純水２ｌと直径１０mmのＹＴＺボー
ル３kgとを加え２０時間湿式混合し、１５０℃で乾燥し
た。その後、この混合物を粗砕し１１００℃で２時間仮
焼し、次に、仮焼粉を１０ｌボールミルに入れ、純水１
ｌと直径１０mmのＹＴＺボール３kgとを加え２０時間湿
式粉砕した後１５０℃で乾燥した。[0010] Commercially available BaC should have the above composition.
O 3 , TiO 2 , PbO, Y 2 O 3 , Al 2 O 3 , Mn (NO
3 ) 2 and CaTiO 3 are weighed, and 1200 g of raw material is mixed with 10
The mixture was placed in a 1-ball mill, 2 l of pure water and 3 kg of YTZ balls having a diameter of 10 mm were added, wet-mixed for 20 hours, and dried at 150 ° C. Then, this mixture was crushed and calcined at 1100 ° C. for 2 hours, and then the calcined powder was put into a 10 l ball mill and purified water 1
1 and 3 kg of YTZ balls having a diameter of 10 mm were added, wet pulverized for 20 hours, and then dried at 150 ° C.
【００１１】次に、得られた粉砕粉に５％ポリビニルア
ルコール水溶液を１０ｗｔ％加え、ライカイ機で５分間
造粒した後２０メッシュパスして造粒粉とし、その造粒
粉を直径１２mmの成形金型を用いて８００kg／cm2の圧
力でディスク形状に成形した。次に、その成形物を焼成
炉中で３００℃／ｈｒの速度で昇温し、１２８０℃の温
度で１．５時間焼成した後、１５０℃／ｈｒの降温速度
で室温まで徐冷した。その後、得られたサーミスタ素子
の両面にアルミメタリコン溶射電極を設け、正特性サー
ミスタを得、その抵抗温度係数を測定した。Next, 10% by weight of a 5% polyvinyl alcohol aqueous solution was added to the obtained pulverized powder, and the mixture was granulated for 5 minutes with a liquor machine and passed through 20 mesh to obtain granulated powder. The granulated powder having a diameter of 12 mm was formed. It was formed into a disc shape with a pressure of 800 kg / cm 2 using a die. Next, the molded product was heated in a firing furnace at a rate of 300 ° C./hr, fired at a temperature of 1280 ° C. for 1.5 hours, and then gradually cooled to room temperature at a temperature lowering rate of 150 ° C./hr. Then, aluminum metallikon sprayed electrodes were provided on both surfaces of the obtained thermistor element to obtain a positive temperature coefficient thermistor, and the temperature coefficient of resistance thereof was measured.
【００１２】ここで本発明の特徴であるＣａＴｉＯ3に
ついてその作製方法を説明する。市販のＣａＣＯ3、Ｔ
ｉＯ2を１モル：１モルの比率にて秤量し、原料９００
ｇを１０ｌボールミルに入れ、純水２ｌと直径１０mmの
ＹＴＺボール３kgとを加えて２０時間湿式混合した後１
５０℃で乾燥した。その後、混合物を粗砕し１１００℃
で２時間仮焼し、仮焼粉を１０ｌボールミルに入れ、純
水１ｌと直径１０mmのＹＴＺボール３kgとを加えて２０
時間湿式粉砕し１５０℃で乾燥した。その後、ライカイ
機で３分間粗砕してＣａＴｉＯ3粉末を得た。Here, a method for producing CaTiO 3 which is a feature of the present invention will be described. Commercially available CaCO 3 , T
iO 2 was weighed at a ratio of 1 mol: 1 mol to obtain 900
g in a 10 liter ball mill, 2 liters of pure water and 3 kg of YTZ balls having a diameter of 10 mm were added and wet-mixed for 20 hours, and then 1
It was dried at 50 ° C. After that, the mixture is crushed to 1100 ° C.
Calcined for 2 hours, put the calcined powder in a 10 l ball mill, add 1 l of pure water and 3 kg of YTZ balls with a diameter of 10 mm, and add 20
It was wet-milled for an hour and dried at 150 ° C. Then, it was roughly crushed for 3 minutes with a liquor machine to obtain CaTiO 3 powder.
【００１３】なお、本実施例では市販のＣａＣＯ3、Ｔ
ｉＯ2からＣａＴｉＯ3を作製したが、市販のＣａＴｉＯ
3を用いてもかまわない。In this example, commercially available CaCO 3 , T
CaTiO 3 was produced from iO 2 , but commercially available CaTiO 3
You can use 3 .
【００１４】本実施例によるサーミスタ素子の結晶粒子
径、サーミスタ素子特性と従来のサーミスタ素子の結晶
粒子径、サーミスタ素子特性を（表１）に比較して示し
ている。The crystal grain diameter and thermistor element characteristics of the thermistor element according to this example and the crystal grain diameter and thermistor element characteristics of the conventional thermistor element are shown in comparison with each other (Table 1).
【００１５】[0015]
【表１】 [Table 1]
【００１６】（表１）において、ＣａＴｉＯ3を０．０
９〜０．１２５モル含有させたものは、その結晶粒子径
は従来のものと同等であるが、正の抵抗温度係数は向上
していることがわかる。特に、０．０９５〜０．１１５
モルで顕著な効果が得られることがわかる。一方、Ｃａ
ＴｉＯ3の含有量が０．０８、０．１３モルの場合は、
本発明の請求範囲外であり正の抵抗温度係数は向上して
いないことがわかる。In Table 1, CaTiO 3 is 0.0
It can be seen that the crystal particles containing 9 to 0.125 mol have the same crystal particle size as the conventional one, but the positive temperature coefficient of resistance is improved. Especially, 0.095 to 0.115
It can be seen that a significant effect can be obtained in moles. On the other hand, Ca
When the content of TiO 3 is 0.08 or 0.13 mol,
It can be seen that the positive temperature coefficient of resistance is out of the scope of the claims of the present invention and is not improved.
【００１７】また、従来はＳｉＯ2を添加し、ＣａＴｉ
Ｏ3の代わりにＣａＣＯ3、ＴｉＯ2を添加しているが、
正の抵抗温度係数は小さい。Conventionally, SiO 2 is added, and CaTi is added.
CaCO 3 and TiO 2 are added instead of O 3 .
The positive temperature coefficient of resistance is small.
【００１８】さらに、図１に抵抗値−温度の特性を示す
が、従来の電圧を１００Ｖ印加したとき（抵抗値Ｒ1）
の動作温度（Ｔ3）と２２０Ｖ印加したとき（抵抗値
Ｒ2）の動作温度（Ｔ4）の差よりも、本実施例の正特性
サーミスタに電圧を１００Ｖ印加したときの動作温度
（Ｔ1）と２２０Ｖ印加したときの動作温度（Ｔ2）の差
は小さく、ほぼ一定の発熱量に保てることがわかる。Further, FIG. 1 shows resistance value-temperature characteristics. When a conventional voltage of 100 V is applied (resistance value R 1 ).
Operating temperature (T 3) and when 220V is applied (the resistance value R 2) operating temperature (T 4) than the difference of the operating temperature when a voltage is 100V applied to the PTC thermistor of this embodiment of (T 1 ) And the operating temperature (T 2 ) when 220 V is applied are small, and it can be seen that the calorific value can be kept almost constant.
【００１９】そのため、従来のように使用電圧によって
サーミスタ素子を変える必要がなく、同一のサーミスタ
素子を用いることができる。Therefore, it is not necessary to change the thermistor element depending on the used voltage as in the prior art, and the same thermistor element can be used.
【００２０】なお、本実施例ではキュリー温度１９５℃
の定温発熱体を用いるが、ＰｂＯの含有比率を変えた異
なるキュリー温度の定温発熱体にも用いることができ
る。In this embodiment, the Curie temperature is 195 ° C.
Although the constant temperature heating element of No. 2 is used, it can also be used for constant temperature heating elements of different Curie temperatures with different PbO content ratios.
【００２１】ここで正特性サーミスタの抵抗温度特性の
測定方法を説明する。まず室温から３００℃までの温度
変化に対する正特性サーミスタの抵抗値変化を測定しプ
ロットする。次に抵抗値が室温抵抗値の２倍になる温度
をキュリー温度とし、キュリー温度での抵抗値とキュリ
ー温度＋１０℃での抵抗値を求め、その抵抗変化率を
（数１）により算出し抵抗温度係数とした。Here, a method of measuring the resistance temperature characteristic of the positive temperature coefficient thermistor will be described. First, the resistance value change of the positive temperature coefficient thermistor with respect to the temperature change from room temperature to 300 ° C. is measured and plotted. Next, the temperature at which the resistance value is twice the room temperature resistance value is the Curie temperature, the resistance value at the Curie temperature and the resistance value at the Curie temperature + 10 ° C are calculated, and the resistance change rate is calculated by (Equation 1) The temperature coefficient was used.
【００２２】[0022]
【数１】 [Equation 1]
【００２３】なお、通常は、キュリー温度＋３０℃にて
抵抗温度係数を求めるが、本発明はキュリー温度直後の
抵抗温度係数を大きくすることを目的としているため、
キュリー温度＋１０℃にて抵抗温度係数を求めている。Normally, the temperature coefficient of resistance is determined at the Curie temperature + 30 ° C., but the present invention aims to increase the temperature coefficient of resistance immediately after the Curie temperature.
The temperature coefficient of resistance is determined at the Curie temperature + 10 ° C.
【００２４】[0024]
【発明の効果】以上のように本発明は、チタン酸バリウ
ム系半導体磁器組成物１モルに対してＳｉＯ2を添加せ
ず、ＣａＴｉＯ3を０．０９〜０．１２５モル含有させ
ることにより結晶粒子成長を抑制し、かつ、キュリー温
度直後の正の抵抗温度係数の大きい正特性サーミスタを
提供することができる。INDUSTRIAL APPLICABILITY As described above, the present invention does not add SiO 2 to 1 mol of the barium titanate-based semiconductor porcelain composition and makes CaTiO 3 0.09 to 0.125 mol, thereby forming crystal particles It is possible to provide a positive temperature coefficient thermistor which suppresses growth and has a large positive temperature coefficient of resistance immediately after the Curie temperature.
【００２５】なお、本発明では定温発熱体を例として挙
げているが、キュリー温度直後の正の抵抗温度係数を大
きくすることにより、電圧を印加して安定電流に達する
までの減衰特性を向上させることができ、カラーＴＶ消
磁装置、電流制御などの各種スイッチング素子などにも
利用できる。In the present invention, the constant temperature heating element is taken as an example, but by increasing the positive temperature coefficient of resistance immediately after the Curie temperature, the damping characteristic until a stable current is applied by applying a voltage is improved. It can also be used for a color TV degaussing device, various switching elements for current control, and the like.
【図１】正特性サーミスタの抵抗値−温度特性曲線図[Fig. 1] Resistance value-temperature characteristic curve diagram of positive temperature coefficient thermistor
Claims (1)
の表面に形成した電極とを備え、前記サーミスタ素子は
チタン酸バリウム系半導体磁器組成物１モルに対しチタ
ン酸カルシウムを０．０９〜０．１２５モル含有させた
もので構成した正特性サーミスタ。1. A thermistor element and an electrode formed on the surface of the thermistor element, wherein the thermistor element contains 0.09 to 0.125 mol of calcium titanate per mol of the barium titanate-based semiconductor ceramic composition. A positive temperature coefficient thermistor composed of the contained elements.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP20345794A JP3196516B2 (en) | 1994-08-29 | 1994-08-29 | Positive thermistor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP20345794A JP3196516B2 (en) | 1994-08-29 | 1994-08-29 | Positive thermistor |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0869901A true JPH0869901A (en) | 1996-03-12 |
| JP3196516B2 JP3196516B2 (en) | 2001-08-06 |
Family
ID=16474448
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP20345794A Expired - Fee Related JP3196516B2 (en) | 1994-08-29 | 1994-08-29 | Positive thermistor |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3196516B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2013507320A (en) * | 2009-10-14 | 2013-03-04 | エプコス アクチエンゲゼルシャフト | Ceramic material, method for producing ceramic material, and resistance element having ceramic material |
-
1994
- 1994-08-29 JP JP20345794A patent/JP3196516B2/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2013507320A (en) * | 2009-10-14 | 2013-03-04 | エプコス アクチエンゲゼルシャフト | Ceramic material, method for producing ceramic material, and resistance element having ceramic material |
| US9169161B2 (en) | 2009-10-14 | 2015-10-27 | Epcos Ag | Ceramic material, method for producing the ceramic material, and resistor component comprising the ceramic material |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3196516B2 (en) | 2001-08-06 |
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