JPH05337911A - Ceramic green sheet manufacturing method - Google Patents
Ceramic green sheet manufacturing methodInfo
- Publication number
- JPH05337911A JPH05337911A JP14583492A JP14583492A JPH05337911A JP H05337911 A JPH05337911 A JP H05337911A JP 14583492 A JP14583492 A JP 14583492A JP 14583492 A JP14583492 A JP 14583492A JP H05337911 A JPH05337911 A JP H05337911A
- Authority
- JP
- Japan
- Prior art keywords
- green sheet
- slurry
- ceramic green
- gradually
- viscosity
- 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.)
- Withdrawn
Links
- 239000000919 ceramic Substances 0.000 title claims abstract description 16
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 11
- 239000002002 slurry Substances 0.000 claims abstract description 43
- 239000000843 powder Substances 0.000 claims abstract description 21
- 230000005484 gravity Effects 0.000 claims abstract description 15
- 239000007788 liquid Substances 0.000 claims abstract description 5
- 239000011230 binding agent Substances 0.000 claims description 5
- 238000001704 evaporation Methods 0.000 claims description 3
- 230000003247 decreasing effect Effects 0.000 claims description 2
- 238000001035 drying Methods 0.000 claims description 2
- 238000000465 moulding Methods 0.000 claims 1
- 239000002994 raw material Substances 0.000 abstract description 8
- 239000000725 suspension Substances 0.000 abstract description 2
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 12
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 10
- 239000002904 solvent Substances 0.000 description 7
- 230000000052 comparative effect Effects 0.000 description 6
- DOIRQSBPFJWKBE-UHFFFAOYSA-N dibutyl phthalate Chemical compound CCCCOC(=O)C1=CC=CC=C1C(=O)OCCCC DOIRQSBPFJWKBE-UHFFFAOYSA-N 0.000 description 6
- 229920002037 poly(vinyl butyral) polymer Polymers 0.000 description 6
- 238000007606 doctor blade method Methods 0.000 description 5
- 239000000377 silicon dioxide Substances 0.000 description 5
- 239000011521 glass Substances 0.000 description 4
- 238000004898 kneading Methods 0.000 description 4
- 238000007872 degassing Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- 239000002245 particle Substances 0.000 description 3
- 238000007796 conventional method Methods 0.000 description 2
- 239000006185 dispersion Substances 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 229920005989 resin Polymers 0.000 description 2
- 239000011347 resin Substances 0.000 description 2
- 238000000926 separation method Methods 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 229910018072 Al 2 O 3 Inorganic materials 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
- 239000002131 composite material Substances 0.000 description 1
- 239000003960 organic solvent Substances 0.000 description 1
- 238000009849 vacuum degassing Methods 0.000 description 1
Landscapes
- Producing Shaped Articles From Materials (AREA)
Abstract
(57)【要約】
【目的】 本発明は、セラミックグリーンシートの製造
方法に関し、比重の異なる粉末を原料に用いる際、均一
なグリーンシートを容易に得ることができるセラミック
グリーンシートの製造方法を提供することを目的とす
る。
【構成】 比重の異なる無機粉末を液体中に分散させた
懸濁液を成形し乾燥させてグリーンシートを作製する
際、混合中のスラリーの粘度を徐々に上昇させるように
構成する。
(57) [Summary] [Object] The present invention relates to a method for producing a ceramic green sheet, which can easily obtain a uniform green sheet when powders having different specific gravities are used as raw materials. The purpose is to [Structure] When a suspension in which inorganic powders having different specific gravities are dispersed in a liquid is molded and dried to produce a green sheet, the viscosity of the slurry during mixing is gradually increased.
Description
【０００１】[0001]
【産業上の利用分野】本発明は、セラミックグリーンシ
ートの製造方法に係り、詳しくは、セラミック回路基板
等に利用されるセラミック部材に適用することができ、
特に、比重の異なる粉末を原料に用いる際、均一なグリ
ーンシートを容易に得ることができるセラミックグリー
ンシートの製造方法に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing a ceramic green sheet, and more specifically, it can be applied to a ceramic member used for a ceramic circuit board,
In particular, the present invention relates to a method for producing a ceramic green sheet that can easily obtain a uniform green sheet when powders having different specific gravities are used as raw materials.
【０００２】近年、電子機器の高性能化の要請に伴な
い、従来になかった性質を有する材料への要求が高まっ
ており、種々の組み合わせの複合材料が検討されてい
る。In recent years, along with the demand for higher performance of electronic devices, there has been an increasing demand for materials having properties that have not been heretofore known, and various combinations of composite materials have been investigated.
【０００３】[0003]
【従来の技術】従来のセラミックグリーンシートの製造
方法について説明する。まず、セラミック粉末と有機バ
インダ、有機溶剤をボールミル等で混合して懸濁液（以
下スラリーと記す）を作製し、このスラリーをドクター
ブレード法等により、キャリアフィルム上に薄く伸ばし
て乾燥させてグリーンシートを得る。そして、得られた
グリーンシートに種々の加工を施した後、焼成してセラ
ミック部材を得ていた。2. Description of the Related Art A conventional method for manufacturing a ceramic green sheet will be described. First, a ceramic powder, an organic binder, and an organic solvent are mixed in a ball mill or the like to prepare a suspension (hereinafter referred to as a slurry), and the slurry is thinly spread on a carrier film by a doctor blade method or the like and dried to obtain green. Get the sheet. Then, the obtained green sheet was subjected to various processes and then fired to obtain a ceramic member.
【０００４】[0004]
【発明が解決しようとする課題】しかしながら、上記し
た従来のセラミックグリーンシートの製造方法では、比
重の異なる粉末を原料に用いると、スラリーが乾燥する
までの間の沈降速度が各々異なるため、均質なグリーン
シートが得難くなるという問題があった。特に、比重が
スラリー溶媒よりも大きい粉末と小さい粉末を混合する
と、比重がスラリー溶媒より大きい粉末は乾燥中に水面
下に沈み、一方比重がスラリー溶媒より小さい粉末は水
面上に浮いてしまって比重の各々異なる粉末同志で分離
してしまい、均質なグリーンシートを得るのは極めて困
難であった。そこで、比重の各々異なる粉末同志の分離
を防ぐためには、スラリー粘度を高く設定すればよいと
考えられるが、最初から粘度を高くして混合すると均一
に混合するのが難しくなる。However, in the above-mentioned conventional method for producing a ceramic green sheet, when powders having different specific gravities are used as raw materials, the settling speeds until the slurry is dried are different, so that a homogeneous slurry is obtained. There was a problem that it was difficult to obtain a green sheet. In particular, when a powder having a specific gravity larger than that of the slurry solvent is mixed with a powder having a smaller specific gravity, a powder having a specific gravity larger than the slurry solvent sinks below the water surface during drying, while a powder having a specific gravity smaller than the slurry solvent floats above the water surface. It was extremely difficult to obtain a uniform green sheet because the powders were separated by different powders. Therefore, in order to prevent the powders having different specific gravities from being separated from each other, it is conceivable to set the slurry viscosity high, but if the viscosity is increased from the beginning to mix, it becomes difficult to uniformly mix.
【０００５】そこで、本発明は、比重の異なる粉末を原
料に用いる際、均質なグリーンシートを容易に得ること
ができるセラミックグリーンシートの製造方法を提供す
ることを目的としている。Therefore, an object of the present invention is to provide a method for producing a ceramic green sheet, which can easily obtain a homogeneous green sheet when powders having different specific gravities are used as raw materials.
【０００６】[0006]
【課題を解決するための手段】本発明によるセラミック
グリーンシートの製造方法は上記目的達成のため、比重
の異なる無機粉末を液体中に分散させたスラリーを成形
し乾燥させてグリーンシートを作製する際、混合中のス
ラリー粘度を徐々に上昇させるものである。本発明にお
いては、前記混合中のスラリー粘度を徐々に上昇させる
のを、スラリー温度を徐々に低下させることにより行う
場合であってもよいし、また、混合中のスラリーの液体
を徐々に蒸発させることにより行う場合であってもよい
し、更には、混合中のスラリーに有機バインダを徐々に
加えることにより行う場合であってもよい。In order to achieve the above object, the method for producing a ceramic green sheet according to the present invention is carried out when a slurry in which inorganic powders having different specific gravities are dispersed in a liquid is molded and dried to produce a green sheet. The viscosity of the slurry during mixing is gradually increased. In the present invention, gradually increasing the viscosity of the slurry during mixing may be performed by gradually decreasing the temperature of the slurry, or gradually evaporating the liquid of the slurry during mixing. It may be carried out by adding the organic binder gradually to the slurry being mixed.
【０００７】[0007]
【作用】本発明では、スラリーの粘度を、混練開始時に
は低く、その後均一に混合された時点で徐々に高めて、
引き伸ばす時は粘度が高い状態で行うようにしたため、
凝集粒が少なく、粉末の分離を生じさせることなく均一
な分散状態を保ちつつ混練することができ、均質なグリ
ーンシートを得ることができる。なお、スラリーの粘度
制御は、スラリー温度の制御、溶剤量の制御、バ
インダ添加量の制御の３種類の手法で容易に行うことが
できる。In the present invention, the viscosity of the slurry is low at the start of kneading and then gradually increased when uniformly mixed,
Since I tried to stretch it while the viscosity was high,
The number of agglomerated particles is small, the powder can be kneaded while maintaining a uniform dispersion state without separation of the powder, and a uniform green sheet can be obtained. The viscosity of the slurry can be easily controlled by three types of methods: controlling the slurry temperature, controlling the solvent amount, and controlling the binder addition amount.
【０００８】[0008]
【実施例】以下、本発明を図面に基づいて説明する。無
機粉末には、比重0.5 の中空シリカ粉末（平均粒径20μ
ｍ）100 ｇと、比重2.5 のアルミナＡｌ2Ｏ3粉末（平均
粒径５μｍ）500 ｇを使用し、これにエタノールとポリ
ビニルブチラール樹脂、及びジブチルフタレートを加え
て真空脱泡装置付ミキサーにて混練してスラリーを作製
した。図は後述する実施例１〜実施例３、比較例におけ
る溶剤及び有機成分の量を示す図である。 （実施例１）図１に示す中空シリカ、ガラス、エタノー
ル、ＰＶＢ、及びＤＢＰの各原料をミキサーに封入し、
内部の温度を50℃にして２時間混練した。その後、温度
を毎分0.5 ℃の割合で20℃まで下げながら更に１時間混
練を続けたところ、図２に示すように、スラリー粘度は
混合中徐々に上昇していた。次いで、得られたスラリー
を真空脱泡した後、ドクターブレード法により厚さ300
μｍのグリーンシートを成形した。そして、これを20ｃ
ｍ角に切断して厚さと重量を測定し、密度を算出し、１
バッチ中のグリーンシート密度の変化を調べたところ、
図３に示すように、バッチ中でのグリーンシート密度の
ばらつきは極端に小さくなっているのが判った。 （実施例２）図１に示す中空シリカ、ガラス、エタノー
ル、ＰＶＢ及びＤＢＰの各原料をミキサーに入れ、常温
常圧で２時間混練した。次に、内部を減圧にし、エタノ
ールを毎分５ｃｃの割合で蒸発させながら更に１時間混
練を続けたところ、図２に示すように、スラリー粘度は
混合中徐々に上昇していた。次いで、得られたスラリー
を真空脱泡した後、ドクターブレード法により厚さ300
μｍのグリーンシートを成形した。そして、これを20ｃ
ｍ角に切断して厚さと重量を測定し、密度を算出し、１
バッチ中のグリーンシート密度の変化を調べたところ、
図３に示すように、バッチ中でのグリーンシート密度の
ばらつきは極端に小さくなっているのが判った。 （実施例３）図１に示す中空シリカ、ガラス、エタノー
ル、ＰＶＢ及びＤＢＰの各原料をミキサーに入れ、常温
常圧で２時間混練した。次に、ポリビニルブチラール樹
脂を10分に10ｇずつ加えながら更に１時間混練を続けた
ところ、図２に示すように、スラリー粘度は混合中徐々
に上昇していた。次いで、得られたスラリーを真空脱泡
した後、ドクターブレード法により厚さ300 μｍのグリ
ーンシートを成形した。そして、これを20ｃｍ角に切断
して厚さと重量を測定し、密度を算出し、１バッチ中の
グリーンシート密度の変化を調べたところ、図３に示す
ように、バッチ中でのグリーンシート密度のばらつきは
極端に小さくなっているのが判った。 （比較例）図１に示す中空シリカ、ガラス、エタノー
ル、ＰＶＢ及びＤＢＰの各原料をミキサーに入れ、常温
常圧で３時間混練した。次いで、得られたスラリーを真
空脱泡した後、ドクターブレード法により厚さ300 μｍ
のグリーンシートを成形した。そして、これを20ｃｍ角
に切断して厚さと重量を測定し、密度を算出し、１バッ
チ中のグリーンシート密度の変化を調べたところ、図３
に示すように、バッチ中でのグリーンシート密度のばら
つきは極端に大きくなっているのが判った。しかも曲線
は右上がりになる傾向にあり、すなわちグリーンシート
密度は全体としては徐々に大きくなっている。これはグ
リーンシートの組成自体が粉末の分離により徐々に変化
しているためと解釈できる。DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the drawings. Hollow silica powder with a specific gravity of 0.5 (average particle size 20μ
m) 100 g and 500 g of alumina Al 2 O 3 powder with a specific gravity of 2.5 (average particle size 5 μm) are used, and ethanol, polyvinyl butyral resin and dibutyl phthalate are added to this and kneaded with a mixer equipped with a vacuum degassing device. Then, a slurry was prepared. The figure shows the amounts of the solvent and the organic component in Examples 1 to 3 and Comparative Example described later. (Example 1) Each material of hollow silica, glass, ethanol, PVB, and DBP shown in FIG. 1 was enclosed in a mixer,
The internal temperature was adjusted to 50 ° C. and the mixture was kneaded for 2 hours. After that, when the temperature was lowered to 20 ° C. at a rate of 0.5 ° C./min and kneading was continued for another hour, the slurry viscosity gradually increased during mixing as shown in FIG. Then, after degassing the obtained slurry in a vacuum, a thickness of 300 is obtained by the doctor blade method.
A green sheet of μm was formed. And this is 20c
Cut into m-square pieces, measure thickness and weight, calculate density, and
When examining the change in the density of the green sheet in the batch,
As shown in FIG. 3, it was found that the variation of the green sheet density in the batch was extremely small. Example 2 The raw materials of hollow silica, glass, ethanol, PVB and DBP shown in FIG. 1 were put in a mixer and kneaded at room temperature and atmospheric pressure for 2 hours. Next, when the interior was evacuated and kneading was continued for another hour while evaporating ethanol at a rate of 5 cc / min, the slurry viscosity gradually increased during mixing, as shown in FIG. Then, after degassing the obtained slurry in a vacuum, a thickness of 300 is obtained by the doctor blade method.
A green sheet of μm was formed. And this is 20c
Cut into m squares, measure thickness and weight, calculate density, and
When examining the change in the density of the green sheet in the batch,
As shown in FIG. 3, it was found that the variation of the green sheet density in the batch was extremely small. Example 3 The raw materials of hollow silica, glass, ethanol, PVB and DBP shown in FIG. 1 were placed in a mixer and kneaded at room temperature and atmospheric pressure for 2 hours. Next, when kneading was continued for another hour while adding 10 g of polyvinyl butyral resin every 10 minutes, the slurry viscosity gradually increased during mixing, as shown in FIG. Next, after degassing the obtained slurry under vacuum, a green sheet having a thickness of 300 μm was formed by a doctor blade method. Then, this was cut into 20 cm squares, the thickness and weight were measured, the density was calculated, and the change in the green sheet density in one batch was examined. As shown in FIG. 3, the green sheet density in the batch was It was found that the variation of was extremely small. (Comparative Example) The raw materials of hollow silica, glass, ethanol, PVB and DBP shown in FIG. 1 were put in a mixer and kneaded at room temperature and atmospheric pressure for 3 hours. Then, the obtained slurry is degassed in vacuum and then the thickness is 300 μm by the doctor blade method.
Green sheet was molded. Then, this was cut into 20 cm squares, the thickness and weight were measured, the density was calculated, and the change in the density of the green sheets in one batch was examined.
As shown in, it was found that the variation in the green sheet density in the batch was extremely large. Moreover, the curve tends to rise to the right, that is, the green sheet density gradually increases as a whole. This can be interpreted as the composition itself of the green sheet gradually changes due to the separation of the powder.
【０００９】このように、比較例のスラリー粘度を変化
させない場合では、バッチ中でのグリーンシート密度の
ばらつきが極端に大きくなっていたので対し、本発明に
おける実施例１のスラリー温度制御によってスラリー粘
度を徐々に上昇させる場合、実施例２のスラリー溶剤量
制御によってスラリー粘度を上昇させる場合、実施例３
のスラリーバインダ添加量制御によってスラリー粘度を
上昇させる場合共全て、バッチ中でのグリーンシート密
度のばらつきを比較例よりも極端に小さくなっていた。
このため、均質なグリーンシートを得ることができる。As described above, in the case where the slurry viscosity of the comparative example was not changed, the dispersion of the green sheet density in the batch was extremely large, whereas the slurry viscosity was controlled by controlling the slurry temperature in Example 1 of the present invention. When gradually increasing the slurry viscosity by increasing the slurry solvent amount control in Example 2,
In all cases where the slurry viscosity was increased by controlling the slurry binder addition amount, the variation in the green sheet density in the batch was extremely smaller than that in the comparative example.
Therefore, a uniform green sheet can be obtained.
【００１０】[0010]
【発明の効果】本発明によれば、比重の異なる粉末を原
料に用いる際、均質なグリーンシートを容易に得ること
ができるという効果がある。According to the present invention, when powders having different specific gravities are used as raw materials, it is possible to easily obtain a homogeneous green sheet.
【図１】実施例１〜実施例３及び比較例における溶剤お
よび有機用成分の量を示す図である。FIG. 1 is a diagram showing amounts of a solvent and an organic component in Examples 1 to 3 and a comparative example.
【図２】実施例１〜実施例３におけるスラリー粘度の変
化を示す図である。FIG. 2 is a diagram showing changes in slurry viscosity in Examples 1 to 3.
【図３】実施例１〜実施例３及び比較例における１バッ
チ中のグリーンシート密度の変化を示す図である。FIG. 3 is a diagram showing changes in green sheet density in one batch in Examples 1 to 3 and Comparative Example.
Claims (4)
せたスラリーを成形し乾燥させてグリーンシートを作製
する際、混合中のスラリー粘度を徐々に上昇させること
を特徴とするセラミックグリーンシートの製造方法。1. A ceramic green sheet characterized by gradually increasing the viscosity of a slurry during mixing, when forming a slurry in which inorganic powders having different specific gravities are dispersed in a liquid and molding and drying the slurry. Production method.
させるのを、スラリー温度を徐々に低下させることによ
り行うことを特徴とする請求項１記載のセラミックグリ
ーンシートの製造方法。2. The method for producing a ceramic green sheet according to claim 1, wherein the slurry viscosity during the mixing is gradually increased by gradually decreasing the slurry temperature.
させるのを、スラリーの液体を徐々に蒸発させることに
より行うことを特徴とする請求項１記載のセラミックグ
リーンシートの製造方法。3. The method for producing a ceramic green sheet according to claim 1, wherein the slurry viscosity during the mixing is gradually increased by gradually evaporating the liquid of the slurry.
させるのを、スラリーに有機バインダを徐々に加えるこ
とにより行なうことを特徴とする請求項１記載のセラミ
ックグリーンシートの製造方法。4. The method for producing a ceramic green sheet according to claim 1, wherein the slurry viscosity during the mixing is gradually increased by gradually adding an organic binder to the slurry.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14583492A JPH05337911A (en) | 1992-06-05 | 1992-06-05 | Ceramic green sheet manufacturing method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14583492A JPH05337911A (en) | 1992-06-05 | 1992-06-05 | Ceramic green sheet manufacturing method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH05337911A true JPH05337911A (en) | 1993-12-21 |
Family
ID=15394192
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP14583492A Withdrawn JPH05337911A (en) | 1992-06-05 | 1992-06-05 | Ceramic green sheet manufacturing method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH05337911A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2357373A (en) * | 1999-12-13 | 2001-06-20 | Murata Manufacturing Co | Production process for monolithic ceramic electronic component |
-
1992
- 1992-06-05 JP JP14583492A patent/JPH05337911A/en not_active Withdrawn
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2357373A (en) * | 1999-12-13 | 2001-06-20 | Murata Manufacturing Co | Production process for monolithic ceramic electronic component |
| GB2357373B (en) * | 1999-12-13 | 2002-02-13 | Murata Manufacturing Co | Monolithic ceramic electronic component and production process therefor, and ceramic paste and production process therefor |
| US6808577B2 (en) | 1999-12-13 | 2004-10-26 | Murata Manufacturing Co., Ltd. | Monolithic ceramic electronic component and production process therefor, and ceramic paste and production process therefor |
| CN1307667C (en) * | 1999-12-13 | 2007-03-28 | 株式会社村田制作所 | Single-piece ceramic electronic element and mfg. method thereof, ceramic paste and mfg. method thereof |
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