JPH11177241A - Low temperature fired substrate - Google Patents

Low temperature fired substrate

Info

Publication number
JPH11177241A
JPH11177241A JP34499897A JP34499897A JPH11177241A JP H11177241 A JPH11177241 A JP H11177241A JP 34499897 A JP34499897 A JP 34499897A JP 34499897 A JP34499897 A JP 34499897A JP H11177241 A JPH11177241 A JP H11177241A
Authority
JP
Japan
Prior art keywords
temperature
conductive paste
green sheet
low
firing
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.)
Pending
Application number
JP34499897A
Other languages
Japanese (ja)
Inventor
Masatoshi Suehiro
雅利 末広
Yutaka Nakayama
豊 中山
Shinichi Ogura
晋一 小倉
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Dowa Holdings Co Ltd
DKS Co Ltd
Original Assignee
Dai Ichi Kogyo Seiyaku Co Ltd
Dowa Mining Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Dai Ichi Kogyo Seiyaku Co Ltd, Dowa Mining Co Ltd filed Critical Dai Ichi Kogyo Seiyaku Co Ltd
Priority to JP34499897A priority Critical patent/JPH11177241A/en
Publication of JPH11177241A publication Critical patent/JPH11177241A/en
Pending legal-status Critical Current

Links

Abstract

PROBLEM TO BE SOLVED: To form a conductor circuit with least warping, by printing on a green sheet a conductive paste whose firing temperature that shows maximum contraction speed is higher than that of the green sheet. SOLUTION: A green sheet on which a conductive paste is printed is laminated in plural numbers and then fired at low temperature to provide a low- temperature fired substrate. Here, the firing temperature of the conductive paste showing a maximum contraction speed is higher than that of the green sheet. The green sheet or the conductive paste film is fired in a belt-type kiln or a box furnace set to a certain temperature, for measuring contraction coefficient at the set temperature, then the set temperature is changed for measuring contraction coefficient at each set temperature, which is plotted to obtain a contraction coefficient curve of the green sheet or the conductive paste film (conductive paste).

Description

【発明の詳細な説明】DETAILED DESCRIPTION OF THE INVENTION

【0001】[0001]

【発明の属する技術分野】本発明は低温焼成基板に関
し、さらに詳しくは、反りが非常に少ない導体回路を形
成できる低温焼成基板に関する。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a low-temperature fired substrate, and more particularly, to a low-temperature fired substrate capable of forming a conductor circuit having very little warpage.

【0002】[0002]

【従来の技術】本発明に関連する技術分野に用いられる
セラミック多層回路基板としては、アルミナ多層回路基
板が主に用いられていた。アルミナ多層回路基板を製造
するためには、アルミナの焼結を行うために1500℃
以上の高温を必要とし、またその温度に耐えるための導
体材料としてMo−MnやW系の高温焼結用材料が使用
されていた。
2. Description of the Related Art Alumina multilayer circuit boards have been mainly used as ceramic multilayer circuit boards used in the technical field related to the present invention. To manufacture an alumina multilayer circuit board, 1500 ° C.
A high temperature sintering material such as Mo-Mn or W has been used as a conductor material that requires the above high temperature and withstands the temperature.

【0003】一方、最近ではアルミナよりも低温で焼成
することのできる低温焼成基板が徐々に用いられ始めて
いる。この低温焼成基板では、800〜1000℃の焼
成温度で焼結が可能となり、そのため導体材料もMo−
MnやWよりも低抵抗のAgやCuが使用できるように
なり、高密度実装基板としてのCSP(チップサイズパ
ッケージ)、あるいはMCM(マルチチップモジュー
ル)に応用展開が図られつつある。
On the other hand, recently, a low-temperature fired substrate that can be fired at a lower temperature than alumina has been gradually used. In this low-temperature fired substrate, sintering can be performed at a firing temperature of 800 to 1000 ° C., so that the conductor material is also Mo-
Ag and Cu, which have lower resistance than Mn and W, can be used, and their application to CSP (chip size package) as a high-density mounting substrate or MCM (multi-chip module) is being promoted.

【0004】低温焼成基板は、一般にガラスフリット成
分とセラミック成分を混合したものであって、ガラスフ
リットの低融点を利用して低温度で焼結させて基板とす
るものである。
[0004] A low-temperature fired substrate is generally a mixture of a glass frit component and a ceramic component, and is sintered at a low temperature using a low melting point of the glass frit to form a substrate.

【0005】このような低温焼成基板を製造する方法
は、基板となるセラミックグリーンシート上に導電ペー
ストを印刷し、またセラミック層間の電気的接続をとる
ためにセラミックグリーンシートのバイアホール部に導
電ペーストを充填し、それらのグリーンシートを複数枚
積層した後一括で焼成する方法である。
[0005] A method of manufacturing such a low-temperature fired substrate is to print a conductive paste on a ceramic green sheet as a substrate, and to form a conductive paste in a via hole portion of the ceramic green sheet to make electrical connection between ceramic layers. And firing a batch after laminating a plurality of those green sheets.

【0006】[0006]

【発明が解決しようとする課題】ところが、このように
して製造する低温焼成基板には、焼成後に基板に反りが
発生するという問題がある。それは、焼成時の収縮率の
異なる材料であるセラミックグリーンシートと導電ペー
ストを同時に焼成するために起こる現象であり、もしも
反りが発生すると基板として使用できないことは言うま
でもない。
However, the low-temperature fired substrate manufactured in this manner has a problem that the substrate is warped after firing. This is a phenomenon that occurs because ceramic green sheets, which are materials having different shrinkage rates during firing, and a conductive paste are fired at the same time. If warpage occurs, it cannot be used as a substrate.

【0007】本発明は従来の技術の有する上記のような
問題点に鑑みてなされたものであって、その目的は、反
りが非常に少ない導体回路を形成できる低温焼成基板を
提供することにある。
SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems of the prior art, and has as its object to provide a low-temperature fired substrate capable of forming a conductor circuit with very little warpage. .

【0008】[0008]

【課題を解決するための手段】上記目的を達成するため
に本発明は、導電ペーストの最大収縮速度を示す焼成温
度をグリーンシートのその温度以上とし、その導電ペー
ストを上記グリーンシートに印刷して焼成することによ
り、反りが非常に少ない導体回路を形成することができ
る。
In order to achieve the above-mentioned object, the present invention provides a method for printing a conductive sheet on a green sheet by setting the firing temperature, which indicates the maximum shrinkage rate of the conductive paste, equal to or higher than that of the green sheet. By firing, a conductor circuit with very little warpage can be formed.

【0009】[0009]

【発明の実施の形態】すなわち、本発明の要旨は、導電
ペーストを印刷したグリーンシートを複数枚積層して低
温で焼成することによって得られる低温焼成基板であっ
て、導電ペーストの最大収縮速度を示す焼成温度がグリ
ーンシートの最大収縮速度を示す焼成温度以上であるこ
とを特徴とする低温焼成基板にある。
The gist of the present invention is to provide a low-temperature fired substrate obtained by laminating a plurality of green sheets on which a conductive paste is printed and firing at a low temperature. The low-temperature fired substrate is characterized in that the firing temperature shown is equal to or higher than the firing temperature showing the maximum shrinkage rate of the green sheet.

【0010】セラミックグリーンシートと導電ペースト
を同時に焼成したときに反りが発生するのは、グリーン
シートより導電ペーストの収縮の方が早く起こると、グ
リーンシートが焼結する前に導電ペーストが収縮してし
まい、その結果、反りの発生に至るものと考えられる。
[0010] The reason why the warpage occurs when the ceramic green sheet and the conductive paste are simultaneously fired is that when the conductive paste shrinks faster than the green sheet, the conductive paste shrinks before the green sheet is sintered. As a result, it is considered that warpage occurs.

【0011】そこで、本発明の低温焼成基板によれば、
以下に説明するように反りが非常に少ない導体回路を形
成できるのである。
Therefore, according to the low-temperature fired substrate of the present invention,
As described below, a conductor circuit with very little warpage can be formed.

【0012】すなわち、ある温度に設定したベルト式焼
成炉あるいはボックス炉でグリーンシートまたは導電ペ
ーストフィルムを焼成し、その設定温度における収縮率
を測定し、次いで、その設定温度を変えることによっ
て、各設定温度での収縮率を測定し、それをプロットし
てグリーンシートまたは導電ペーストフィルム(導電ペ
ースト)の収縮率曲線を得ることができる。また、TM
A装置(温度機械式分析装置)を用いても、収縮率曲線
を得ることは可能である。そのような方法により測定し
た収縮率曲線の一例を図1に示す。
That is, the green sheet or the conductive paste film is fired in a belt-type firing furnace or a box furnace set at a certain temperature, the shrinkage at the set temperature is measured, and then the set temperature is changed to change each set temperature. The shrinkage ratio at the temperature is measured, and plotted to obtain a shrinkage ratio curve of the green sheet or the conductive paste film (conductive paste). Also, TM
It is also possible to obtain a shrinkage rate curve by using an A apparatus (thermomechanical analyzer). FIG. 1 shows an example of a shrinkage rate curve measured by such a method.

【0013】図1について説明すると、曲線1は約3.
6μmのAg粉末を用いた導電ペーストの収縮率曲線を
示したものであるが、収縮は約600℃より始まり、約
770℃で最大の傾き、すなわち、最大収縮速度(単位
時間当たりの最大収縮率)を示し、徐々に収縮速度は小
さくなって約850℃でほぼ収縮はなくなる。一方、曲
線2はグリーンシート(B23−SiO2 ガラスとAl
23を混合した系)の収縮率曲線であるが、収縮は約5
50℃で始まり、約730℃で最大収縮速度を示し、約
850℃でほぼ収縮はなくなる。従って、図1では、導
電ペーストの最大収縮速度を示す焼成温度(770℃)
の方が、グリーンシートの最大収縮速度を示す焼成温度
(730℃)より高く、導電ペーストの方が遅く収縮す
る。その結果、セラミックグリーンシートと導電ペース
トを同時に焼成しても、反りが非常に少ない導体回路を
形成できるのである。
Referring to FIG. 1, curve 1 is approximately 3.
FIG. 6 shows a shrinkage rate curve of a conductive paste using 6 μm Ag powder, in which shrinkage starts at about 600 ° C. and has a maximum slope at about 770 ° C., ie, a maximum shrinkage rate (maximum shrinkage rate per unit time). ), And the shrinkage rate gradually decreases, and almost no shrinkage occurs at about 850 ° C. On the other hand, curve 2 shows a green sheet (B 2 O 3 —SiO 2 glass and Al
Is a shrinkage curve of the 2 O 3 mixed system), shrinkage of about 5
Beginning at 50 ° C., it shows a maximum shrink rate at about 730 ° C., and at about 850 ° C., there is almost no shrinkage. Therefore, in FIG. 1, the firing temperature (770 ° C.) indicating the maximum shrinkage rate of the conductive paste is shown.
Is higher than the firing temperature (730 ° C.) that indicates the maximum shrinkage rate of the green sheet, and the conductive paste shrinks more slowly. As a result, even if the ceramic green sheet and the conductive paste are fired at the same time, a conductor circuit with very little warpage can be formed.

【0014】[0014]

【実施例】以下に実施例を挙げて本発明を具体的に説明
する。低温焼成基板用グリーンシートとして、B23
SiO2 ガラスとAl23を混合した系のもの(以下
「グリーンシートA」という)とLiO2−Al23
SiO2系のもの(以下「グリーンシートB」という)
を用いた。このグリーンシートの厚みは、約100μm
とした。
EXAMPLES The present invention will be specifically described below with reference to examples. As the green sheet for low-temperature firing substrate, B 2 O 3 -
A mixture of SiO 2 glass and Al 2 O 3 (hereinafter referred to as “green sheet A”) and LiO 2 —Al 2 O 3
SiO 2 type (hereinafter referred to as “green sheet B”)
Was used. The thickness of this green sheet is about 100 μm
And

【0015】また、導電ペーストとしては、以下の表1
に示す組成のAg系のものを用い、Ag粉末の粒子径を
変えたり、添加物を工夫することによって導電ペースト
の収縮率を変えた。そして、この導電ペーストを、離形
フィルム上にバーコーターで100μm厚になるように
コーティングし、乾燥後導電ペーストフィルムを引き剥
がした。
The conductive paste is shown in Table 1 below.
The shrinkage ratio of the conductive paste was changed by changing the particle diameter of Ag powder or devising an additive by using an Ag-based material having the composition shown in FIG. Then, this conductive paste was coated on a release film with a bar coater so as to have a thickness of 100 μm, and after drying, the conductive paste film was peeled off.

【0016】収縮率は、乾燥後(80℃×15分後)の
上記グリーンシートまたは乾燥後の上記導電ペーストフ
ィルムそれぞれの長さ(L0) と焼成後のそれぞれの長
さ(L)を比べることによって算出した。すなわち、収
縮率(%)=((L0−L)/L0 )×100で求めら
れる。そのようにして求められる収縮率に基づいて図1
と同様の収縮率曲線を描き、その収縮率曲線より導電ペ
ーストフィルムの最大収縮速度を示す焼成温度を求め
た。その結果を表1に示す。
The shrinkage ratio is obtained by comparing the length (L 0 ) of the green sheet or the dried conductive paste film after drying (after 80 ° C. for 15 minutes) with the length (L) after firing. It was calculated by: That is, shrinkage (%) = ((L 0 −L) / L 0 ) × 100. FIG. 1 is based on the shrinkage ratio thus obtained.
The same shrinkage rate curve was drawn, and the firing temperature showing the maximum shrinkage rate of the conductive paste film was determined from the shrinkage rate curve. Table 1 shows the results.

【0017】また、反りの測定は、グリーンシート上に
導電ペーストを10mm×10mmのパターンでスクリーン
印刷し、900℃で焼成した後の反り量を反りゲージで
測定し、その反り量からグリーンシートの厚みを差し引
いたものを反り量とし、その値を表1に示す。表1に示
す反り量は、20μm以下のものが良好である。
The warpage is measured by printing a conductive paste on a green sheet in a pattern of 10 mm × 10 mm and firing at 900 ° C. to measure the amount of warpage using a warp gauge. The value obtained by subtracting the thickness is defined as a warpage amount, and the value is shown in Table 1. The warpage shown in Table 1 is preferably 20 μm or less.

【0018】なお、グリーンシートAの最大収縮速度を
示す焼成温度は760℃であり、グリーンシートBのそ
れは720℃である。
The firing temperature at which the maximum shrinkage rate of the green sheet A is 760 ° C., and that of the green sheet B is 720 ° C.

【0019】[0019]

【表1】 [Table 1]

【0020】表1に明らかなように、導電ペーストの最
大収縮速度を示す焼成温度がグリーンシートのその温度
以上である実施例1〜6においては、反りの非常に少な
い良好な回路基板を得ることができる。
As apparent from Table 1, in Examples 1 to 6 in which the firing temperature showing the maximum shrinkage rate of the conductive paste is equal to or higher than that of the green sheet, it is possible to obtain a good circuit board with very little warpage. Can be.

【0021】一方、導電ペーストの最大収縮速度を示す
焼成温度がグリーンシートのその温度よりも低い比較例
1〜6においては、反り量が大きくなることが明らかで
ある。
On the other hand, in Comparative Examples 1 to 6, in which the firing temperature at which the conductive paste shows the maximum shrinkage rate is lower than that of the green sheet, it is apparent that the amount of warpage is large.

【0022】[0022]

【発明の効果】本発明によれば、反りが非常に少ない導
体回路を形成できる低温焼成基板を提供することができ
る。
According to the present invention, it is possible to provide a low-temperature fired substrate capable of forming a conductor circuit with very little warpage.

【図面の簡単な説明】[Brief description of the drawings]

【図1】グリーンシートまたは導電ペーストフィルムの
焼成温度と収縮率との関係を示す図である。
FIG. 1 is a diagram showing a relationship between a firing temperature and a shrinkage rate of a green sheet or a conductive paste film.

Claims (1)

【特許請求の範囲】[Claims] 【請求項1】 導電ペーストを印刷したグリーンシート
を複数枚積層して低温で焼成することによって得られる
低温焼成基板であって、導電ペーストの最大収縮速度を
示す焼成温度がグリーンシートの最大収縮速度を示す焼
成温度以上であることを特徴とする低温焼成基板。
1. A low-temperature fired substrate obtained by laminating a plurality of green sheets on which a conductive paste is printed and firing at a low temperature, wherein the firing temperature indicating the maximum shrinkage rate of the conductive paste is the maximum shrinkage rate of the green sheet. A low-temperature fired substrate characterized by a firing temperature or higher.
JP34499897A 1997-12-15 1997-12-15 Low temperature fired substrate Pending JPH11177241A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP34499897A JPH11177241A (en) 1997-12-15 1997-12-15 Low temperature fired substrate

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP34499897A JPH11177241A (en) 1997-12-15 1997-12-15 Low temperature fired substrate

Publications (1)

Publication Number Publication Date
JPH11177241A true JPH11177241A (en) 1999-07-02

Family

ID=18373595

Family Applications (1)

Application Number Title Priority Date Filing Date
JP34499897A Pending JPH11177241A (en) 1997-12-15 1997-12-15 Low temperature fired substrate

Country Status (1)

Country Link
JP (1) JPH11177241A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2008262916A (en) * 2008-05-26 2008-10-30 Dowa Electronics Materials Co Ltd Silver powder for conductive paste, and conductive paste using silver powder

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2008262916A (en) * 2008-05-26 2008-10-30 Dowa Electronics Materials Co Ltd Silver powder for conductive paste, and conductive paste using silver powder

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