JPH06226718A - Powder molding method - Google Patents
Powder molding methodInfo
- Publication number
- JPH06226718A JPH06226718A JP5034829A JP3482993A JPH06226718A JP H06226718 A JPH06226718 A JP H06226718A JP 5034829 A JP5034829 A JP 5034829A JP 3482993 A JP3482993 A JP 3482993A JP H06226718 A JPH06226718 A JP H06226718A
- Authority
- JP
- Japan
- Prior art keywords
- powder
- mold
- slurry
- molding method
- predetermined shape
- 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
Links
Landscapes
- Compositions Of Oxide Ceramics (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】この発明は、セラミック原料粉体
などの粉体成形方法に関し、詳しくは、ゲルキャスティ
ング法による粉体成形方法に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a powder molding method for ceramic raw material powder, and more particularly to a powder molding method by a gel casting method.
【０００２】[0002]
【従来の技術及び発明が解決しようとする課題】セラミ
ック原料粉体などの粉体を所定の形状に成形する方法と
しては、粉体を所定の型に入れて加圧することにより所
定の形状に成形する加圧成形法、スラリーを所定の型に
射出して成形する射出成形法、スラリーを所定の鋳込み
型に鋳込むことにより溶媒を石膏などからなる型に吸収
させて粉体を所定の形状に成形する鋳込み成形法などの
方法が一般的に使用されている。2. Description of the Related Art As a method of molding powder such as ceramic raw material powder into a predetermined shape, the powder is put into a predetermined mold and pressed to obtain a predetermined shape. Pressure molding method, injection molding method of injecting the slurry into a predetermined mold to mold it, and casting the slurry into a predetermined casting mold to absorb the solvent into a mold made of gypsum or the like to form the powder into a predetermined shape. A method such as a cast molding method for molding is generally used.
【０００３】また、近年では、大型形状品や複雑形状品
の成形方法として、アクリルモノマーをゲル化剤として
添加したスラリーを型に注入した後、該スラリーを型内
でゲル化させることにより所定の形状に成形する、いわ
ゆるゲルキャスティング法が提案されている。Further, in recent years, as a method of molding a large-sized product or a complex-shaped product, after a slurry containing an acrylic monomer as a gelling agent is poured into a mold, the slurry is gelled in the mold to obtain a predetermined product. A so-called gel casting method has been proposed in which it is molded into a shape.
【０００４】しかし、上記従来の成形方法のうち加圧成
形法は、小型品の成形には適しているが大型形状品や複
雑形状品の成形が極めて困難であるという問題点があ
る。However, among the above-mentioned conventional molding methods, the pressure molding method is suitable for molding a small product, but has a problem that it is extremely difficult to mold a large-sized product or a complicated-shaped product.
【０００５】また、射出成形法は、成形体中に多量のバ
インダーが含まれるため、バインダーを除去するための
工程すなわち脱脂工程に時間がかかりコストが上昇する
という問題点がある。また、成形時に取り込まれた残留
ガスがボイドやラミネーションの原因となりやすいとい
う問題点がある。Further, the injection molding method has a problem that a step for removing the binder, that is, a degreasing step takes time and costs are increased because a large amount of binder is contained in the molded body. In addition, there is a problem that the residual gas taken in during molding tends to cause voids and lamination.
【０００６】また、鋳込み成形法においては、成形体が
薄膜などのいわゆる薄物である場合には比較的均一な成
形体が得られるが、厚肉物では密度差が生じやすく、割
れが発生しやすいという問題点がある。また、鋳込み型
のライフが短く、高価なためコスト高になるという問題
点がある。[0006] In the casting method, when the molded product is a so-called thin product such as a thin film, a relatively uniform molded product can be obtained, but a thick product tends to cause a density difference and cracks. There is a problem. Further, there is a problem that the life of the casting mold is short and it is expensive, resulting in high cost.
【０００７】さらに、アクリルモノマーを用いたゲルキ
ャスティング法は、上記射出成形法や鋳込み成形法に比
べて低コストで、均一性の高い成形体を得ることができ
るという特徴を有しているが、アクリルモノマーは毒性
が強く、環境上、安全上の面から、工業生産には不適当
であるという問題点がある。Further, the gel casting method using an acrylic monomer is characterized in that a molded article having high uniformity can be obtained at a lower cost than the injection molding method and the casting molding method. Acrylic monomer is highly toxic and has a problem that it is unsuitable for industrial production from the viewpoint of environment and safety.
【０００８】この発明は、上記問題点を解決するもので
あり、大型形状や複雑形状の成形体を、特に大掛かりな
設備を必要とすることなく、容易かつ確実に成形するこ
とが可能な粉体成形方法を提供することを目的とする。The present invention solves the above-mentioned problems, and a powder capable of easily and reliably molding a large-sized or complex-shaped molded body without requiring particularly large-scale equipment. An object is to provide a molding method.
【０００９】[0009]
【課題を解決するための手段】上記目的を達成するため
に、発明者等は種々の実験、検討を行い、ゲルキャステ
ィング法において、水溶性蛋白質をゲル化剤として含
有、溶解させたスラリーを型内に注入して、冷却、ゲル
化させることにより、均一な成形体が得られることを知
り、この発明を完成した。[Means for Solving the Problems] In order to achieve the above-mentioned object, the inventors have conducted various experiments and studies, and in a gel casting method, a slurry containing a water-soluble protein as a gelling agent and dissolving it is used as a mold. The present invention has been completed by knowing that a uniform molded body can be obtained by injecting it into the inside, cooling and gelling.
【００１０】すなわち、この発明の粉体成形方法は、粉
体を含有するスラリーを型に注入し、型内でゲル化させ
ることにより、粉体を所定の形状に成形する粉体成形方
法において、粉体１００重量部に対し、ゲル化剤として
水溶性蛋白質を５〜１０重量部の割合で添加し、これを
１００℃以下の温度で溶解させてなるスラリーを型内に
注入して、冷却、ゲル化させることにより所定形状の成
形体を得ることを特徴とする。That is, according to the powder molding method of the present invention, a slurry containing the powder is poured into a mold and gelled in the mold to mold the powder into a predetermined shape. Water-soluble protein was added as a gelling agent at a ratio of 5 to 10 parts by weight to 100 parts by weight of the powder, and a slurry prepared by dissolving this at a temperature of 100 ° C. or lower was poured into a mold and cooled, A feature is that a molded product having a predetermined shape is obtained by gelling.
【００１１】[0011]
【作用】毒性のない水溶性蛋白質をゲル化剤として添加
し、１００℃以下の温度でこの水溶性蛋白質を溶解させ
たスラリーが型に注入され、冷却（型との熱交換などに
よる自然冷却と、強制冷却とを問わない）されることに
より、スラリーが型内でゲル化し、所定の形状に成形さ
れる。[Function] A non-toxic water-soluble protein is added as a gelling agent, and a slurry in which this water-soluble protein is dissolved is poured into a mold at a temperature of 100 ° C. or lower and cooled (natural cooling such as heat exchange with the mold is performed. And forced cooling), the slurry gels in the mold and is molded into a predetermined shape.
【００１２】したがって、環境上、安全上の問題を生じ
ることなく、容易に粉体を所定の形状に成形することが
できるようになる。Therefore, it becomes possible to easily form the powder into a predetermined shape without causing environmental safety problems.
【００１３】なお、この発明の粉体成形方法における水
溶性蛋白質としては、ゼラチン，アルブミンなどを例示
することができるが、さらに他の水溶性蛋白質を用いる
ことも可能である。Examples of the water-soluble protein in the powder molding method of the present invention include gelatin, albumin, etc., but other water-soluble proteins can be used.
【００１４】なお、水溶性蛋白質の配合割合は、粉体１
００重量部に対して、５〜１０重量部の範囲にあること
が好ましい。これは、水溶性蛋白質の配合割合が５重量
部未満の場合、ゲル化が不十分になり、また、１０重量
部を越えて添加すると、その除去に要する時間が増大し
たり、焼成工程でひびや変形を生じたりするというよう
な問題点があることによる。The mixing ratio of the water-soluble protein is powder 1
It is preferably in the range of 5 to 10 parts by weight with respect to 00 parts by weight. This is because when the content of the water-soluble protein is less than 5 parts by weight, gelation becomes insufficient, and when it is added in excess of 10 parts by weight, the time required for its removal increases or cracking occurs in the firing process. This is because there is a problem such as deformation or deformation.
【００１５】[0015]
【実施例】以下、この発明の実施例を示して、その特徴
をさらに詳しく説明する。EXAMPLES The features of the present invention will be described in more detail below with reference to examples of the present invention.
【００１６】まず、原料粉体として、ＺｒＯ2−ＴｉＯ2
−ＳｎＯ2−ＮｉＯ誘電体材料粉体を用意し、これを、
溶剤（分散媒）である純水、及び分散剤（ポリカルボン
酸アンモニウム）と下記の割合で配合した。 誘電体材料粉体 ：１００重量部 純水 ： ３９重量部 分散剤（（ポリカルボン酸アンモニウム）：０．３重量部First, as a raw material powder, ZrO 2 --TiO 2
Prepared -SnO 2 -NiO dielectric material powder, this,
Pure water as a solvent (dispersion medium) and a dispersant (ammonium polycarboxylate) were mixed in the following proportions. Dielectric material powder: 100 parts by weight Pure water: 39 parts by weight Dispersant ((ammonium polycarboxylate): 0.3 parts by weight
【００１７】そして、この配合組成物を内容積９リット
ルの塩化ビニル製ポットに入れて２４時間湿式混合して
スラリーを調製した。それから、このスラリーに水溶性
蛋白質としてゼラチンを、スラリー中の誘電体材料粉体
１００重量部に対し７．０重量部の割合で添加し、水浴
で７０〜８０℃に加熱し、２０分間攪拌してゼラチンを
溶解させた後、１５分間真空脱気を行った。Then, the blended composition was placed in a vinyl chloride pot having an internal volume of 9 liters and wet-mixed for 24 hours to prepare a slurry. Then, gelatin as a water-soluble protein was added to this slurry at a ratio of 7.0 parts by weight to 100 parts by weight of the dielectric material powder in the slurry, heated to 70 to 80 ° C. in a water bath, and stirred for 20 minutes. Then, the gelatin was dissolved, and vacuum deaeration was performed for 15 minutes.
【００１８】それから、このようにして得られたスラリ
ーを静かに型に注入し、５分間静置後に離型して成形体
を得た。得られた成形体には、割れや変形は認められな
かった。Then, the slurry thus obtained was gently poured into a mold, allowed to stand for 5 minutes and then released from the mold to obtain a molded body. No cracking or deformation was observed in the obtained molded body.
【００１９】そして、この成形体を２０℃で４８時間、
送風乾燥した後、１００℃／ｈｒの昇温速度で昇温して
５００℃で１時間保持し、さらに、１３８０℃に昇温し
て６時間保持することにより焼結させた。Then, the molded body was heated at 20 ° C. for 48 hours,
After drying by air blowing, the temperature was raised at a temperature rising rate of 100 ° C./hr and kept at 500 ° C. for 1 hour, and further raised to 1380 ° C. and kept for 6 hours for sintering.
【００２０】得られた焼結体は割れなどの欠陥もなく、
緻密で均一な焼結体であることが確認された。The obtained sintered body has no defects such as cracks,
It was confirmed that the sintered body was dense and uniform.
【００２１】なお、上記実施例では、誘電体材料粉体を
所定の形状に成形する方法を例にとって説明したが、こ
の発明は、上記実施例に限定されるものではなく、原料
粉体の種類や性状、スラリー中の固形分濃度、溶媒及び
分散剤の種類や配合割合、水溶性蛋白質の種類や添加量
などに関し、この発明の要旨の範囲内において、種々の
応用、変形を加えることが可能である。In the above embodiment, the method of molding the dielectric material powder into a predetermined shape has been described as an example, but the present invention is not limited to the above embodiment, and the kind of raw material powder is used. It is possible to add various applications and modifications within the scope of the present invention regarding the properties and properties, the solid content concentration in the slurry, the type and blending ratio of the solvent and the dispersant, the type and addition amount of the water-soluble protein, etc. Is.
【００２２】[0022]
【発明の効果】上述のように、この発明の粉体成形方法
は、粉体１００重量部に対し、ゲル化剤として水溶性蛋
白質を５〜１０重量部の割合で添加し、これを１００℃
以下の温度で溶解させてなるスラリーを型内に注入し
て、冷却、ゲル化させることにより所定形状の成形体を
得るようにしているので、加圧成形法のように、加圧充
填を行うことが不要で高価な成形型を必要とせず、複雑
形状や大型形状などの任意の形状の成形体を容易かつ確
実に製造することができるとともに、形状変更にも容易
に対応することができる。また、高密度で均一な成形
体、焼結体を得ることができる。As described above, in the powder molding method of the present invention, water-soluble protein as a gelling agent is added at a ratio of 5 to 10 parts by weight with respect to 100 parts by weight of the powder, and this is added at 100 ° C.
A slurry formed by melting at the following temperature is poured into a mold, and a molded product having a predetermined shape is obtained by cooling and gelling. Therefore, pressure filling is performed as in the pressure molding method. It is possible to easily and surely manufacture a molded body having an arbitrary shape such as a complicated shape or a large shape without needing an expensive molding die, and it is also possible to easily cope with a shape change. Further, it is possible to obtain a high-density and uniform molded body and sintered body.
【００２３】さらに、ゲル化剤である水溶性蛋白質が、
従来のゲル化剤であるアクリルモノマーのような毒性を
有していないため、環境上や安全上の面から工業的な生
産工程への適用が妨げられることがない。また、既存の
設備にこの発明の粉体成形方法を適用することも可能で
ある。Further, the water-soluble protein which is a gelling agent is
Since it does not have the toxicity of acrylic monomers that are conventional gelling agents, application to industrial production processes is not hindered from the environmental and safety standpoints. The powder molding method of the present invention can also be applied to existing equipment.
Claims (1)
型内でゲル化させることにより、粉体を所定の形状に成
形する粉体成形方法において、 粉体１００重量部に対し、ゲル化剤として水溶性蛋白質
を５〜１０重量部の割合で添加し、これを１００℃以下
の温度で溶解させてなるスラリーを型内に注入して、冷
却、ゲル化させることにより所定形状の成形体を得るこ
とを特徴とする粉体成形方法。1. A slurry containing powder is poured into a mold,
In a powder molding method in which powder is molded into a predetermined shape by gelling in a mold, water-soluble protein as a gelling agent is added at a ratio of 5 to 10 parts by weight to 100 parts by weight of the powder. A powder molding method, characterized in that a slurry obtained by dissolving the slurry at a temperature of 100 ° C. or lower is poured into a mold, cooled, and gelled to obtain a molded product having a predetermined shape.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5034829A JPH06226718A (en) | 1993-01-29 | 1993-01-29 | Powder molding method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5034829A JPH06226718A (en) | 1993-01-29 | 1993-01-29 | Powder molding method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH06226718A true JPH06226718A (en) | 1994-08-16 |
Family
ID=12425092
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP5034829A Pending JPH06226718A (en) | 1993-01-29 | 1993-01-29 | Powder molding method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH06226718A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1998034744A1 (en) * | 1997-02-12 | 1998-08-13 | The Procter & Gamble Company | Method of constructing fully dense metal molds and parts |
| JP2013241311A (en) * | 2012-05-22 | 2013-12-05 | Denso Corp | Plastic molding composition and baked product |
| JP2013241310A (en) * | 2012-05-22 | 2013-12-05 | Denso Corp | Plastic molding composition and baked product |
-
1993
- 1993-01-29 JP JP5034829A patent/JPH06226718A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1998034744A1 (en) * | 1997-02-12 | 1998-08-13 | The Procter & Gamble Company | Method of constructing fully dense metal molds and parts |
| JP2013241311A (en) * | 2012-05-22 | 2013-12-05 | Denso Corp | Plastic molding composition and baked product |
| JP2013241310A (en) * | 2012-05-22 | 2013-12-05 | Denso Corp | Plastic molding composition and baked product |
| US9738785B2 (en) | 2012-05-22 | 2017-08-22 | Denso Corporation | Plastic molding composition and sintered product |
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