JPH08963B2 - Jig for firing electronic components - Google Patents
Jig for firing electronic componentsInfo
- Publication number
- JPH08963B2 JPH08963B2 JP61178565A JP17856586A JPH08963B2 JP H08963 B2 JPH08963 B2 JP H08963B2 JP 61178565 A JP61178565 A JP 61178565A JP 17856586 A JP17856586 A JP 17856586A JP H08963 B2 JPH08963 B2 JP H08963B2
- Authority
- JP
- Japan
- Prior art keywords
- jig
- alumina
- firing
- base material
- thermistor
- 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 - Lifetime
Links
Landscapes
- Coating By Spraying Or Casting (AREA)
- Fixed Capacitors And Capacitor Manufacturing Machines (AREA)
Description
【発明の詳細な説明】 〔産業上の利用分野〕 この発明は電子部品、特にPbを含有するサーミスタを
焼成するに適した焼成用治具の改良に関するものであ
る。DETAILED DESCRIPTION OF THE INVENTION [Industrial application] The present invention relates to an improvement in a firing jig suitable for firing an electronic component, particularly a Pb-containing thermistor.
従来、電子部品、特にPbを含有するPTCサーミスタの
焼成工程においては、アルミナ質の焼成用治具の上にジ
ルコニア粉末を敷き、その上にサーミスタを載せて焼成
している。この際、アルミナ質の治具中のSiO2成分とサ
ーミスタ中のPb成分とがジルコニア粉末を通して反応す
るのを防ぐため、なるべくAl2O3含有量の多い、例えばA
l2O3含有量99.5％以上の治具の要求がされるのである。
しかし、治具中のアルミナの含有量が多くなるほど、熱
膨張係数も大きくなり、治具は熱衝撃に弱くなる。その
ため大型形状のものでは亀裂が入り使用できないので、
やむを得ず焼成能率の悪い小型のものを使用しているの
が現状である。Conventionally, in the firing process of electronic parts, especially PTC thermistors containing Pb, zirconia powder is spread on an alumina-based firing jig, and the thermistor is placed on the zirconia powder and fired. At this time, in order to prevent the SiO 2 component in the alumina jig and the Pb component in the thermistor from reacting through the zirconia powder, the Al 2 O 3 content is as high as possible, for example, A
There is a demand for jigs with an l 2 O 3 content of 99.5% or more.
However, as the content of alumina in the jig increases, the coefficient of thermal expansion also increases, and the jig becomes vulnerable to thermal shock. For that reason, cracks cannot be used with large-sized ones,
The current situation is to use a small one with inevitable firing efficiency.
このように急熱、急冷の熱衝撃に強く、しかも大型形
状の焼成用治具が安価に供給されることが待たれてい
る。Thus, it is expected that a large-scale firing jig that is resistant to the thermal shock of rapid heat and quenching and that is large in size is supplied at low cost.
熱衝撃に強く、大型形状の焼成用治具として、アルミ
ナ・シリカ質基材の表面にジルコニアを溶射した治具が
提案されている。（特開昭61-12017号および特開昭61-2
4225号）が、この場合にはジルコニアの結晶型を安定化
させるためジルコニア中にCaOを含有させなければなら
ず、この安定化剤のCaOが、サーミスタ中のPbと反応し
てサーミスタの電気的特性を低下させるため使用できな
いのである。A jig in which zirconia is sprayed on the surface of an alumina / silica base material has been proposed as a jig for firing in a large shape that is resistant to thermal shock. (JP-A-61-12017 and JP-A-61-2
No. 4225), in this case, CaO must be contained in the zirconia to stabilize the crystal form of zirconia, and this stabilizer CaO reacts with Pb in the thermistor to cause electrical conductivity of the thermistor. It cannot be used because it deteriorates the characteristics.
本発明者等は、上述の欠点を解消するため溶射法によ
る焼成用治具の開発を鋭意研究し、アルミナ・シリカ質
基材にアルミナ質の溶射をすることによって、熱衝撃に
強くて大型形状にでき、しかも被焼成電子部品との反応
の心配もない焼成用治具を得ることに成功したものであ
る。The present inventors have earnestly studied the development of a firing jig by a thermal spraying method in order to solve the above-mentioned drawbacks, and by spraying alumina on an alumina / silica base material, it is resistant to thermal shock and has a large shape. The present invention succeeds in obtaining a firing jig that can be manufactured without any fear of reaction with electronic components to be fired.
この発明はアルミナ・シリカ質の材料の表面に高純度
のアルミナ溶射層を形成することを特徴とする、PTCサ
ーミスタのような電子部品焼成用治具である。The present invention is a jig for firing electronic parts such as a PTC thermistor, which is characterized by forming a high-purity alumina sprayed layer on the surface of an alumina / silica material.
基材となるアルミナ・シリカ質材料は熱衝撃に強い、
通常の耐火れんがや匣鉢として使用されるものであり、
Al2O3とSiO2とを主成分とするもので、不可避的不純物
は通常の耐火物の範囲内で許される。Alumina / silica materials as the base material are resistant to thermal shock,
It is used as a normal refractory brick or jar,
Al 2 O 3 and SiO 2 are the main components, and unavoidable impurities are allowed within the range of ordinary refractories.
このアルミナ・シリカ質基材中のAl2O3の含有量は60
〜95重量％、好ましくは70〜90重量％のものを使用す
る。Al2O3の含有量が95重量％以上では、サーミスタ焼
成の際の急熱急冷により早い時期に基材に亀裂が生じ、
またAl2O3の含有量が60重量％以下場合は、アルミナ・
シリカ質基材の構成鉱物は通常ムライトおよびクリスト
バライトが安定相であり、この基材にアルミナを溶射コ
ーティングすると、基材構成鉱物であるクリストバライ
ト中のSi成分が溶射層に拡散し、アルミナと反応しムラ
イトとなるため、剥離などの原因となったり、サーミス
タと反応するなど、いずれも好ましくない。Al2O3の含
有量が上記の範囲内であれば、溶射層のムライト化もな
く、また基材の熱膨張率の値と溶射層の熱膨張率の値と
が一致していなくても、治具の使用中に加熱冷却を受け
ても溶射層が剥離したり、治具に亀裂が発生することは
ない。The content of Al 2 O 3 in this alumina / silica substrate is 60.
~ 95 wt%, preferably 70-90 wt% is used. When the content of Al 2 O 3 is 95% by weight or more, cracking occurs in the substrate at an early stage due to rapid heating and quenching during thermistor firing,
If the Al 2 O 3 content is 60 wt% or less,
The constituent minerals of the siliceous base material are usually mullite and cristobalite as stable phases.When this base material is spray-coated with alumina, the Si component in the base material constituent mineral cristobalite diffuses into the sprayed layer and reacts with alumina. Since it becomes mullite, it is not preferable because it causes peeling or reacts with the thermistor. If the content of Al 2 O 3 is within the above range, the sprayed layer does not become mullite, and the thermal expansion coefficient of the base material and the thermal expansion coefficient of the sprayed layer do not match. Even if the jig is heated and cooled during use, the sprayed layer does not peel off or the jig does not crack.
溶射には通常の溶射方法を用いることができるが、溶
射材料であるアルミナの融点から考えてプラズマ溶射
が、特に本発明の目的とする大型形状の治具への溶射に
は水プラズマ溶射が好ましい。溶射は通常のセラミック
溶射法で行なわれ、溶射粉末の粒径は150μｍ以下を用
い、溶射層の厚みは0.1〜3mmが好ましい。これは0.1mm
以下では均質な溶射層が形成出来ないのに加え、SiO2と
被焼成物との反応が防止できない。また3mm以上では熱
覆歴を受けた際に溶射層が剥離したり、溶射層自身に亀
裂が発生する恐れがあるためである。Although an ordinary thermal spraying method can be used for thermal spraying, plasma thermal spraying is preferable considering the melting point of alumina, which is the thermal spraying material, and water plasma thermal spraying is particularly preferable for thermal spraying to a jig having a large shape for the purpose of the present invention. . The thermal spraying is performed by an ordinary ceramic thermal spraying method, the particle size of the thermal spraying powder is 150 μm or less, and the thickness of the thermal spraying layer is preferably 0.1 to 3 mm. This is 0.1mm
In the following, a homogeneous sprayed layer cannot be formed and the reaction between SiO 2 and the material to be fired cannot be prevented. Further, when the thickness is 3 mm or more, the thermal spray layer may peel off or the thermal spray layer itself may crack when it is subjected to thermal history.
溶射材料のアルミナ中の不純物はできるだけ少ない方
が望ましく、特にSiO2とアルカリ成分は被焼成物との反
応を防ぐ点からも少ないほどよい。このように溶射層中
のSiO2分をなるべく低く抑えておけば、緻密な溶射層の
ために、基材中のSiO2分と被焼成物との反応を防止でき
るのである。It is desirable that the amount of impurities in alumina of the thermal spray material is as small as possible, and in particular, the smaller the amount of SiO 2 and the alkali component, the better in terms of preventing the reaction with the material to be fired. In this way, if the SiO 2 content in the sprayed layer is kept as low as possible, the reaction between the SiO 2 content in the base material and the material to be fired can be prevented because of the dense sprayed layer.
以下この発明を実施例にて詳細に説明する。 The present invention will be described in detail below with reference to examples.
Al2O380重量％、SiO217％、その他残部が不可避的不
純物よりなるアルミナ・シリカ質基材を250x250x10mmに
切り出し、その表面にAl2O3純度99.6％、平均粒径45μ
ｍのアルミナ粉末を水プラズマ溶射装置により約1mm厚
さに溶射した。Alumina / silica base material consisting of Al 2 O 3 80% by weight, SiO 2 17%, and the balance of unavoidable impurities is cut out into 250x250x10 mm, and the surface has Al 2 O 3 purity of 99.6% and average particle diameter of 45μ.
m of alumina powder was sprayed with a water plasma spraying device to a thickness of about 1 mm.
この治具の上に純ジルコニア粉末を薄く敷いてPbを含
有するPTCサーミスタの焼成を行なったところ、希望の
特性を持ったサーミスタが得られた。焼成を30回繰り返
しても、サーミスタの特性も一定しており、溶射体も剥
離などもみられなかった。When a pure zirconia powder was thinly laid on this jig and a Pb-containing PTC thermistor was fired, a thermistor having desired characteristics was obtained. Even if the firing was repeated 30 times, the characteristics of the thermistor were constant, and neither the sprayed material nor peeling was observed.
また、溶射層の厚さを約0.05mmとしたものでは溶射コ
ーティング層表面にはサーミスタと明らかに反応した痕
跡が認められ、焼成されたサーミスタも抵抗特性値が大
きく変化し、溶射層を約5mmとしたものでは溶射層と基
材との間に剥離がみられた。Also, when the thickness of the sprayed layer is about 0.05 mm, a trace that clearly reacts with the thermistor is recognized on the surface of the sprayed coating layer, and the resistance characteristic value of the fired thermistor changes greatly, and the sprayed layer has a thickness of about 5 mm. In this case, peeling was observed between the sprayed layer and the base material.
さらに、上記のアルミナ・シリカ質基材をそのまヽ用
いたものと、アルミナ・シリカ質基材上にCaO安定化ジ
ルコニアを溶射したものでは、同じようにジルコニア粉
末を敷いてPTCサーミスタの焼成を行なっても、いずれ
も希望の特性を持ったサーミスタは得られず、それぞれ
SiO2およびCaOとの反応の結果と思われるサーミスタ特
性の変化がみられた。Furthermore, in the case where the above alumina / silica base material is used as it is and in the case where CaO-stabilized zirconia is sprayed on the alumina / silica base material, the zirconia powder is spread in the same manner and the PTC thermistor is baked. Even if you do, none of the thermistors with the desired characteristics can be obtained, each
Changes in thermistor properties were observed, which are probably the result of reaction with SiO 2 and CaO.
実施例にみられるように、本発明のアルミナ・シリカ
質基材上にアルミナを溶射した焼成用治具では被焼成物
との反応もなく希望の特性を持った製品の焼成が可能で
あり、しかも繰り返しての使用に耐えるものである。ま
た、アルミナ・シリカ質基材はアルミナに比して安価で
あり、大型の形状にできるため焼成の効率が著しく向上
するものである。As seen in the examples, in the firing jig in which alumina is sprayed on the alumina-silica base material of the present invention, it is possible to fire a product having desired characteristics without reaction with an object to be fired, Moreover, it withstands repeated use. Further, the alumina / silica base material is cheaper than alumina and can be formed into a large shape, so that the firing efficiency is remarkably improved.
───────────────────────────────────────────────────── フロントページの続き (56)参考文献 特開 昭61−24225（ＪＰ，Ａ) 特開 昭61−12017（ＪＰ，Ａ) 特開 昭59−70758（ＪＰ，Ａ) 特公 昭59−52530（ＪＰ，Ｂ２) ─────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A 61-24225 (JP, A) JP-A 61-12017 (JP, A) JP-A 59-70758 (JP, A) JP-B 59- 52530 (JP, B2)
Claims (1)
シリカ質基材の表面にアルミナ溶射層を有することを特
徴とする電子部品焼成用治具。1. Alumina having an Al 2 O 3 content of 60 to 95% by weight.
A jig for firing electronic parts, comprising an alumina sprayed layer on the surface of a siliceous base material.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61178565A JPH08963B2 (en) | 1986-07-28 | 1986-07-28 | Jig for firing electronic components |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61178565A JPH08963B2 (en) | 1986-07-28 | 1986-07-28 | Jig for firing electronic components |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6333551A JPS6333551A (en) | 1988-02-13 |
| JPH08963B2 true JPH08963B2 (en) | 1996-01-10 |
Family
ID=16050703
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP61178565A Expired - Lifetime JPH08963B2 (en) | 1986-07-28 | 1986-07-28 | Jig for firing electronic components |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH08963B2 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0544325A (en) * | 1991-08-08 | 1993-02-23 | Inax Corp | Tile hanging process |
| JP3579155B2 (en) * | 1995-01-18 | 2004-10-20 | 東芝セラミックス株式会社 | Tools for firing |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP5952530B2 (en) | 2010-05-13 | 2016-07-13 | 住友化学株式会社 | Method for inspecting defects in green honeycomb molded body, and inspection apparatus for defects in green honeycomb molded body |
-
1986
- 1986-07-28 JP JP61178565A patent/JPH08963B2/en not_active Expired - Lifetime
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP5952530B2 (en) | 2010-05-13 | 2016-07-13 | 住友化学株式会社 | Method for inspecting defects in green honeycomb molded body, and inspection apparatus for defects in green honeycomb molded body |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6333551A (en) | 1988-02-13 |
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