JPH0354147A - Thermistor porcelain composition - Google Patents
Thermistor porcelain compositionInfo
- Publication number
- JPH0354147A JPH0354147A JP1187833A JP18783389A JPH0354147A JP H0354147 A JPH0354147 A JP H0354147A JP 1187833 A JP1187833 A JP 1187833A JP 18783389 A JP18783389 A JP 18783389A JP H0354147 A JPH0354147 A JP H0354147A
- Authority
- JP
- Japan
- Prior art keywords
- porcelain
- thermistor
- strength
- main components
- elements
- 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.)
- Granted
Links
- 229910052573 porcelain Inorganic materials 0.000 title claims abstract description 26
- 239000000203 mixture Substances 0.000 title claims abstract description 12
- 229910052748 manganese Inorganic materials 0.000 claims abstract description 7
- 229910052759 nickel Inorganic materials 0.000 claims abstract description 7
- 229910052751 metal Inorganic materials 0.000 claims abstract description 4
- 239000000919 ceramic Substances 0.000 claims description 13
- 239000012071 phase Substances 0.000 abstract description 4
- 229910052596 spinel Inorganic materials 0.000 abstract description 4
- 239000011029 spinel Substances 0.000 abstract description 4
- 229910052745 lead Inorganic materials 0.000 abstract description 3
- 238000004519 manufacturing process Methods 0.000 abstract description 3
- 238000005245 sintering Methods 0.000 abstract description 3
- 238000006243 chemical reaction Methods 0.000 abstract description 2
- 238000001816 cooling Methods 0.000 abstract description 2
- 239000011521 glass Substances 0.000 abstract description 2
- 239000007791 liquid phase Substances 0.000 abstract description 2
- 238000002156 mixing Methods 0.000 abstract 1
- 239000000463 material Substances 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 239000013078 crystal Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000004372 Polyvinyl alcohol Substances 0.000 description 1
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 230000000996 additive effect Effects 0.000 description 1
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 238000009529 body temperature measurement Methods 0.000 description 1
- 238000001354 calcination Methods 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 230000001010 compromised effect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 238000013001 point bending Methods 0.000 description 1
- 229920002451 polyvinyl alcohol Polymers 0.000 description 1
- 230000004043 responsiveness Effects 0.000 description 1
- 239000004065 semiconductor Substances 0.000 description 1
- 230000035939 shock Effects 0.000 description 1
- 229910052709 silver Inorganic materials 0.000 description 1
- 239000004332 silver Substances 0.000 description 1
- 238000005476 soldering Methods 0.000 description 1
- 238000003746 solid phase reaction Methods 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
Landscapes
- Compositions Of Oxide Ceramics (AREA)
- Thermistors And Varistors (AREA)
Abstract
Description
【発明の詳細な説明】
産業上の利用分野
本発明は、温度計測．温度補償などに用いられる負の温
度係数を有するサーミスタ磁器組成物に関するものであ
る。DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to temperature measurement. The present invention relates to a thermistor ceramic composition having a negative temperature coefficient used for temperature compensation and the like.
従来の技術
近年、ＭｎおよびＮｉを主戊分とする酸化物系、いわゆ
るスビネル系サーミスタ磁器は、軽薄短小化の流れに沿
ってチップ化が進み、セラミソクエレメントに要求され
る項目も高精度のみならず、高強度であることが必要な
条件になって来ている。Conventional technology In recent years, oxide-based thermistor ceramics mainly containing Mn and Ni, so-called Subinel-based thermistor ceramics, have been made into chips in line with the trend of becoming lighter, thinner, shorter, and smaller, and the requirements for ceramic ceramic elements are only high precision. However, high strength is becoming a necessary condition.
発明が解決しようとする課題
上記のようなＭｎおよびＮｉを主成分とするスピネル系
サーミスタ磁器を用い、各種用途に展開する場合、製品
によって使用形態、方法は様々であるが、例えばバネで
セラミックエレメントを保持するタイプでのバネ圧、円
柱状セラミックエレメントの両端にキャップ状電極を嵌
合するタイプでの嵌め合い圧力、さらにはハンダ付け時
のヒートショックなど、セラミックエレメントにかかる
負荷には相当なものがあった。このため、セラミック磁
器の高強度が、工程における作業効率のみならず、製品
としての信頼性をも大きく左右するものでありながら、
従来のスビネル系サーミスタ磁器は、高強度のものが必
ずしも得られなく、適度に妥協しなければならないもの
であった。Problems to be Solved by the Invention When using spinel-based thermistor porcelain mainly composed of Mn and Ni as described above, the usage forms and methods vary depending on the product. The loads placed on ceramic elements are considerable, such as the spring pressure in the type that holds the cylindrical ceramic element, the fitting pressure in the type that fits cap-shaped electrodes on both ends of the cylindrical ceramic element, and even heat shock during soldering. was there. For this reason, the high strength of ceramic porcelain greatly influences not only the work efficiency in the process but also the reliability of the product.
Conventional Subinel-based thermistor porcelain cannot always have high strength and has had to be compromised appropriately.
このようなことから、高強度のサーミスタ磁器を作るこ
とが望まれていた。For this reason, it has been desired to produce high-strength thermistor porcelain.
本発明はこのような問題点を解決するもので、磁器自身
の強度を強くすることによって、量産時における作業性
および製品としての信頼性を向上させることを目的とす
るものである。The present invention is intended to solve these problems, and aims to improve workability during mass production and reliability as a product by increasing the strength of the porcelain itself.
課題を解決するための手段
上記の課題を解決するために本発明のサーミスタ磁器組
成物は、金属元素としてＭｎおよびＮｉを主成分とし、
副成分としてｐｂ元素を０．１〜１０．０原子％添加し
てなるものである。また、上記磁器組成に、さらにＢ，
Ｓｉ元素の少なくとも一方を主成分に対して０．１〜１
０．０原子％添加してなるものである。Means for Solving the Problems In order to solve the above problems, the thermistor ceramic composition of the present invention mainly contains Mn and Ni as metal elements,
It is made by adding 0.1 to 10.0 atom % of pb element as a subcomponent. In addition, in addition to the above porcelain composition, B,
At least one of the Si elements is 0.1 to 1 relative to the main component.
It is formed by adding 0.0 atomic %.
作用
さて、本発明にかかるサーミスタ磁器はスピネル構造を
もつ結晶であり、その焼結過程も一般に固相反応をとる
ことが知られている。そして、電気的な特性は結晶粒子
（半導体）に起因するものであり、一方、磁器の強度は
破断面がアルミナ磁器と同じく粒界破壊であることから
、粒子そのものの強度に依存するものではなく、これよ
り弱い粒界の強度に起因していることが解る。また、こ
の両者は一応独立した事象と考えられる。Function The thermistor ceramic according to the present invention is a crystal with a spinel structure, and it is known that the sintering process thereof generally takes a solid phase reaction. Electrical properties are due to crystal grains (semiconductors), whereas the strength of porcelain does not depend on the strength of the particles themselves, as the fracture surface is grain boundary fracture, just like alumina porcelain. , it can be seen that this is due to the strength of the grain boundaries, which is weaker than this. Furthermore, these two events are considered to be independent events.
そして、本発明の構成によれば、ＭｎおよびＮｉを主成
分とする組或に、Ｐｂを添加することにより、あるいは
Ｂ，Ｓｉをさらに添加することによって、焼結時点で部
分的に液相反応が生じ、冷却時に主成分元素のスビネル
相を析出させ、その後、本発明の添加元素であるＰｂ，
Ｂ，Ｓｉは粒界にとどまり、ガラス相を形或し、強度の
大幅増に寄与しているものとなる。これにより高強度の
サーミスタ磁器が得られることとなる。According to the structure of the present invention, by adding Pb to a composition mainly composed of Mn and Ni, or by further adding B and Si, a liquid phase reaction is partially caused at the time of sintering. occurs, and during cooling, the Subinel phase of the main component element is precipitated, and then Pb, which is the additive element of the present invention, is precipitated.
B and Si remain in the grain boundaries, form a glass phase, and contribute to a significant increase in strength. As a result, high-strength thermistor porcelain can be obtained.
実施例 以下、本発明の実施例について説明する。Example Examples of the present invention will be described below.
まず、下記の第１表，第２表に示す組威となるように各
材料の秤量を行い、湿式ボールにて２０時間混合した後
に乾燥させ、その後、大気中で８００℃・２時間保持に
て仮焼処理を施した。この時、出発原料としては、市販
のＭ ｎ ０２， Ｎｉｐ．Ｐ ｂ Ｏ，Ｂ２０３，Ｓ
ｉ ０２を使用した。次に、仮焼処理を施したものを
再びボールミルにて湿式粉砕した後、乾燥させ、５％Ｐ
ＶＡ（ポリビニルアルコール）をｌＱｗｔ％添加し、ラ
イカイ機にて顆粒を行い、１０００ｋｇ／ｃｄの加圧で
４０ｍｍφ×２印の寸法に成形を行った。次いで、この
戊形体を大気中、■２００℃で２時間保持して焼威し、
電極は焼付銀電極を７５０℃にて両面に施した。First, each material was weighed to give the composition shown in Tables 1 and 2 below, mixed in a wet bowl for 20 hours, dried, and then held at 800°C for 2 hours in the air. A calcining treatment was performed. At this time, commercially available M n 02, Nip. P b O, B203, S
i02 was used. Next, the calcined material was wet-pulverized again in a ball mill, dried, and 5% P
VA (polyvinyl alcohol) was added in an amount of 1Qwt%, granulated using a Raikai machine, and molded into a size of 40 mmφ x 2 marks under pressure of 1000 kg/cd. Next, this rod was incinerated by holding it in the air at 200°C for 2 hours.
Baked silver electrodes were applied on both sides at 750°C.
そして、電気的特性の測定は、オイル槽内にて２５℃に
て抵抗値（Ｒ２５）を測定し、比抵抗値（ρ）に換算し
、また５０’Ｃの抵抗値（Ｒｓｏ）をさらに測定して、
この２点よりサーミスタ定数（Ｂ）を算出した。この算
出式は、Ｂ＝３８５４ＸＩｏ（ Ｒ ２５／ Ｒ ｓｏ
）を用いた。さらに、磁器強度は焼結体をまず厚み０．
５ｍｍに研磨（＃８００）Ｌ、その後、ダイシングマシ
ンにて２ ５ ｍ＋ｎ ｘ ５ ｍｍに切り出し、この
試料を３点曲げ試験法にて測定を行い、抗折強度を測定
した。これらの測定結果を下記の第ｌ表，第２表に併せ
て示す。ここで、測定値は試料数５ヶの平均値である。Then, to measure the electrical characteristics, the resistance value (R25) was measured at 25°C in the oil bath, converted to specific resistance value (ρ), and the resistance value (Rso) at 50'C was further measured. do,
The thermistor constant (B) was calculated from these two points. This calculation formula is B=3854XIo(R25/Rso
) was used. Furthermore, the strength of the porcelain is determined by first measuring the sintered body with a thickness of 0.
The sample was polished to 5 mm (#800) and then cut into 25 m+n x 5 mm pieces using a dicing machine, and the sample was measured using a three-point bending test method to measure the bending strength. These measurement results are also shown in Tables 1 and 2 below. Here, the measured value is an average value of five samples.
上記第１表，第２表に示す結果から明らかなように、本
発明実施例のサーミスタ組或によって、電気特性（比抵
抗値ρおよびサーミスタ定数Ｂ）を変化させずに磁器強
度を著しく高くすることができる。As is clear from the results shown in Tables 1 and 2 above, the thermistor assembly of the embodiment of the present invention significantly increases the strength of the porcelain without changing the electrical characteristics (specific resistance value ρ and thermistor constant B). be able to.
ここで、本発明において、ＰｂさらにはＢ，Ｓｉがそれ
ぞれ主戊分に対して０．１原子％未満の場合には、磁器
強度を高くするという本発明の効果が見られず、また一
方、１０．０原子％を超えた場合には比抵抗値ρが大き
く、かつサーミスタ定数Ｂは小さくなり、サーミスタ磁
器としての用をなさないものとなるため、請求範囲外と
している。Here, in the present invention, when Pb, B, and Si are each less than 0.1 atomic % with respect to the main fraction, the effect of the present invention of increasing the porcelain strength is not observed, and on the other hand, If it exceeds 10.0 atom %, the specific resistance value ρ will be large and the thermistor constant B will be small, making it useless as a thermistor ceramic, and therefore it is outside the scope of the claims.
発明の効果
以上のように、本発明のサーミスタ磁器組成物によれば
、上記第１表，第、２表に示すように電気特性を変化さ
せずに磁器強度を著しく高くすることができるものであ
る。したがって、この磁器を用いることにより、生産効
率が向上するのみならず、製品としての信頼性を飛躍的
に向上させることができるものである。また、磁器強度
が著しく向上したことにより、さらに薄く、小型の製品
、の応用も可能となり、応答性の向上した製品への展開
も可能であるなど、本発明のサーミスタ磁器は画期的な
材料組或を提供することができるものである。Effects of the Invention As described above, according to the thermistor porcelain composition of the present invention, the strength of the porcelain can be significantly increased without changing the electrical properties, as shown in Tables 1, 2, and 2 above. be. Therefore, by using this porcelain, not only the production efficiency can be improved, but also the reliability of the product can be dramatically improved. In addition, the thermistor porcelain of the present invention is an innovative material, as the strength of the porcelain has been significantly improved, making it possible to use it in thinner and more compact products, as well as products with improved responsiveness. It is possible to provide a set of
Claims (2)
成分としてＰｂ元素を０．１〜１０．０原子％添加した
ことを特徴とするサーミスタ磁器組成物。(1) A thermistor ceramic composition characterized in that the main components are Mn and Ni as metal elements, and 0.1 to 10.0 atom % of Pb element is added as a subcomponent.
の少なくとも一方を主成分に対して０．１〜１０．０原
子％添加したことを特徴とするサーミスタ磁器組成物。(2) A thermistor porcelain composition characterized in that 0.1 to 10.0 atomic % of at least one of B and Si elements is added to the porcelain composition according to claim 1, based on the main component.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1187833A JP2715567B2 (en) | 1989-07-20 | 1989-07-20 | Thermistor porcelain composition |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1187833A JP2715567B2 (en) | 1989-07-20 | 1989-07-20 | Thermistor porcelain composition |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0354147A true JPH0354147A (en) | 1991-03-08 |
| JP2715567B2 JP2715567B2 (en) | 1998-02-18 |
Family
ID=16213034
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1187833A Expired - Fee Related JP2715567B2 (en) | 1989-07-20 | 1989-07-20 | Thermistor porcelain composition |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2715567B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPWO2008041481A1 (en) * | 2006-09-29 | 2010-02-04 | 株式会社村田製作所 | NTC thermistor porcelain and NTC thermistor using it |
-
1989
- 1989-07-20 JP JP1187833A patent/JP2715567B2/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPWO2008041481A1 (en) * | 2006-09-29 | 2010-02-04 | 株式会社村田製作所 | NTC thermistor porcelain and NTC thermistor using it |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2715567B2 (en) | 1998-02-18 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| LAPS | Cancellation because of no payment of annual fees |