JP2715574B2 - Thermistor porcelain composition - Google Patents
Thermistor porcelain compositionInfo
- Publication number
- JP2715574B2 JP2715574B2 JP1187876A JP18787689A JP2715574B2 JP 2715574 B2 JP2715574 B2 JP 2715574B2 JP 1187876 A JP1187876 A JP 1187876A JP 18787689 A JP18787689 A JP 18787689A JP 2715574 B2 JP2715574 B2 JP 2715574B2
- Authority
- JP
- Japan
- Prior art keywords
- thermistor
- porcelain
- strength
- porcelain composition
- present
- 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
Links
- 229910052573 porcelain Inorganic materials 0.000 title claims description 22
- 239000000203 mixture Substances 0.000 title claims description 14
- 229910052804 chromium Inorganic materials 0.000 claims description 5
- 229910052748 manganese Inorganic materials 0.000 claims description 5
- 229910052759 nickel Inorganic materials 0.000 claims description 5
- 229910052751 metal Inorganic materials 0.000 claims description 2
- 239000000919 ceramic Substances 0.000 description 8
- 229910052596 spinel Inorganic materials 0.000 description 5
- 239000011029 spinel Substances 0.000 description 5
- 238000000034 method Methods 0.000 description 3
- 239000004372 Polyvinyl alcohol Substances 0.000 description 2
- 239000013078 crystal Substances 0.000 description 2
- 229910052745 lead Inorganic materials 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 239000012071 phase Substances 0.000 description 2
- 229920002451 polyvinyl alcohol Polymers 0.000 description 2
- 238000005245 sintering Methods 0.000 description 2
- 229910004298 SiO 2 Inorganic materials 0.000 description 1
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 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
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000001010 compromised effect Effects 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 239000007791 liquid phase Substances 0.000 description 1
- 238000013001 point bending Methods 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
- 239000007858 starting material Substances 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
Landscapes
- Compositions Of Oxide Ceramics (AREA)
- Thermistors And Varistors (AREA)
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。Description: TECHNICAL FIELD The present invention relates to a thermistor ceramic composition having a negative temperature coefficient used for temperature measurement, temperature compensation, and the like.
従来の技術 近年、Mn,Ni,Crを主成分とする酸化物系、いわゆるス
ピ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、セラミッ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。2. Description of the Related Art In recent years, oxide-based thermistors made mainly of Mn, Ni, and Cr, so-called spinel-based thermistor porcelains, have been made into chips along with the trend toward lighter, thinner, and smaller sizes, and the requirements for ceramic elements are only high precision. In addition, high strength is becoming a necessary condition.
発明が解決しようとする課題 上記のようにMn,NiおよびCr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、従来のスピ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 As described above, when the spinel-based thermistor porcelain containing Mn, Ni and Cr as main components is used for various applications, the use form and method vary depending on the product. Spring pressure in the type that holds the ceramic element,
There were considerable loads on the ceramic element, such as the fitting pressure in the type in which the cap-shaped electrodes were fitted to both ends of the cylindrical ceramic element, and the heat shock at the time of soldering. For this reason, the high strength of ceramic porcelain not only affects the work efficiency in the process, but also greatly affects the reliability as a product, but the conventional spinel-based thermistor porcelain does not always have high strength. Had to be moderately compromised.
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 these reasons, it has been desired to produce a 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 solves such a problem, and an object of the present invention is to improve workability during mass production and reliability as a product by increasing the strength of 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,NiおよびCr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0.1〜10.0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 porcelain composition of the present invention contains Mn, Ni and Cr as main components as metal elements, and 0.1 to 10.0 atomic% of Pb elements as subcomponents. It is. Further, the ceramic composition is obtained by adding at least one of B and Si elements to the main component in an amount of 0.1 to 10.0 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
に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。Operation The thermistor porcelain according to the present invention is a crystal having a spinel structure, and it is known that the sintering process generally takes a solid-phase reaction. The electrical characteristics are due to the crystal grains (semiconductor), while the strength of the porcelain does not depend on the strength of the grains themselves, since the fracture surface is a grain boundary fracture like alumina porcelain. It can be seen that this is due to the weak grain boundary strength. These two events are considered to be independent events.
そして、本発明の構成によれば、Mn,NiおよびCrを主
成分とする組成に、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ピネル相を
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、ガラス相を形成し、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。And according to the configuration of the present invention, by adding Pb to the composition containing Mn, Ni and Cr as main components, or
By further adding B and Si, a liquid phase reaction occurs partially at the time of sintering, and a spinel phase as a main component element is precipitated during cooling.After that, Pb, B, and Si, which are additional elements of the present invention, It stays at the grain boundary, forms a glass phase, and contributes to a large increase in strength. Thus, a 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。Examples Hereinafter, examples of the present invention will be described.
まず、下記の第１表，第２表に示す組成となるように
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
MnO2,NiO,Cr2O3,PbO,B2O3,SiO2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％PVA（ポリビニルアルコール）を10w
t％添加し、ライカイ機にて顆粒を行い、1000kg/cm2の
加圧で40mmφ×2mmの寸法に成形を行った。次いで、こ
の成形体を大気中、1200℃で２時間保持して焼成し、電
極は焼付銀電極を750℃にて両面に施した。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℃
の抵抗値（R50）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＝3854
×In（R25/R50）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）し、その後、ダイシン
グマシンにて25mm×5mm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１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。First, each material was weighed so as to have the composition shown in Tables 1 and 2 below, mixed with a wet ball for 20 hours, dried, and then kept at 800 ° C. for 2 hours in the atmosphere. A calcination treatment was performed. At this time, commercially available starting materials
MnO 2 , NiO, Cr 2 O 3 , PbO, B 2 O 3 , and SiO 2 were used. Next, the calcined product was wet-pulverized again by a ball mill, dried, and dried with 5% PVA (polyvinyl alcohol) for 10w.
After adding t%, the mixture was granulated by a raikai machine and molded into a size of 40 mmφ × 2 mm under a pressure of 1000 kg / cm 2 . Next, the molded body was held in the atmosphere at 1200 ° C. for 2 hours and fired, and a baked silver electrode was applied to both surfaces at 750 ° C. for the electrode. For the measurement of the electrical characteristics, the resistance value (R 25 ) is measured at 25 ° C. in an oil bath, converted into a specific resistance value (ρ),
The resistance value further measures (R 50), was calculated thermistor constant (B) from the two points. This calculation formula is: B = 3854
× In (R 25 / R 50 ) was used. Furthermore, the porcelain strength was first polished to a thickness of 0.5 mm (# 800), then cut out to 25 mm x 5 mm using a dicing machine, and this sample was measured by a three-point bending test method to determine the bending strength. Was measured. The measurement results are 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成によって、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,
According to the thermistor composition of the embodiment of the present invention, the strength of the porcelain can be significantly increased without changing the electrical characteristics (specific resistance value ρ and thermistor constant B).
ここで、本発明において、PbさらにはB,Siがそれぞれ
主成分に対して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、1
0.0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 each of Pb, B, and Si is less than 0.1 atomic% with respect to the main component, the effect of the present invention of increasing the porcelain strength is not observed.
When the content exceeds 0.0 atomic%, the specific resistance value ρ is large and the thermistor constant B is small, so that the thermistor does not need to be used as a thermistor ceramic.
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
へ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
材料組成を提供することができるものである。As described above, according to the thermistor porcelain composition of the present invention, the porcelain strength can be significantly increased without changing the electrical characteristics as shown in Tables 1 and 2. . Therefore, by using this porcelain, not only can the production efficiency be improved, but also the reliability as a product can be dramatically improved. The thermistor porcelain of the present invention is an epoch-making material because the strength of the porcelain is remarkably improved, so that it can be applied to thinner and smaller products and can be applied to products with improved responsiveness. It can provide a composition.
Claims (2)
し、副成分として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 porcelain composition characterized by containing Mn, Ni and Cr as main components as metal elements and 0.1 to 10.0 atomic% of Pb elements as subcomponents.
素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. The porcelain composition according to claim 1, further comprising at least one of B and Si elements in an amount of 0.1 to 10.0 atomic% based on the main component.
A thermistor porcelain composition, wherein the composition is added.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1187876A JP2715574B2 (en) | 1989-07-20 | 1989-07-20 | Thermistor porcelain composition |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1187876A JP2715574B2 (en) | 1989-07-20 | 1989-07-20 | Thermistor porcelain composition |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0354154A JPH0354154A (en) | 1991-03-08 |
| JP2715574B2 true JP2715574B2 (en) | 1998-02-18 |
Family
ID=16213754
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1187876A Expired - Fee Related JP2715574B2 (en) | 1989-07-20 | 1989-07-20 | Thermistor porcelain composition |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2715574B2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP5634357B2 (en) | 2011-09-05 | 2014-12-03 | 株式会社椿本チエイン | Silent chain |
-
1989
- 1989-07-20 JP JP1187876A patent/JP2715574B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0354154A (en) | 1991-03-08 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| LAPS | Cancellation because of no payment of annual fees |