JPH06144919A - Ceramic molding composition - Google Patents
Ceramic molding compositionInfo
- Publication number
- JPH06144919A JPH06144919A JP4293163A JP29316392A JPH06144919A JP H06144919 A JPH06144919 A JP H06144919A JP 4293163 A JP4293163 A JP 4293163A JP 29316392 A JP29316392 A JP 29316392A JP H06144919 A JPH06144919 A JP H06144919A
- Authority
- JP
- Japan
- Prior art keywords
- ceramic
- fatty acid
- molding composition
- solidifying agent
- molding
- 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】本発明は泥漿鋳込み成形に使用す
る焼成前のセラミック成形用組成物の改良に関するもの
である。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement in a ceramic molding composition for firing, which is used in slurry casting.
【０００２】[0002]
【従来の技術】近年、エンジンやガスタービン等の機構
部品、化学プラント等の構成部材、更には時計やアクセ
サリー等の装飾部品にもセラミック部材が多く用いられ
るようになってきた。2. Description of the Related Art In recent years, ceramic members have been widely used for mechanical parts such as engines and gas turbines, constituent members for chemical plants, and decorative parts such as watches and accessories.
【０００３】しかし乍ら、前記機関用機構部品やプラン
ト構成部材および装飾部品には複雑な三次元構造をした
形状のものが多いことから、セラミック材料は金属に比
べて耐熱性、耐食性、耐摩耗性に優れ、高強度でかつ比
較的軽量であるにもかかわらず加工性に難点があり、そ
の様な複雑な三次元構造をした形状を有する部材を得る
ことは困難であった。However, since many of the above-mentioned mechanical parts for engines, plant constituent members, and decorative parts have complicated three-dimensional structures, ceramic materials are more resistant to heat, corrosion, and wear than metals. It is excellent in workability, has high strength and is relatively lightweight, but has a problem in workability, and it has been difficult to obtain a member having a shape having such a complicated three-dimensional structure.
【０００４】従来、複雑な形状のセラミック部材を得る
には、プレス成形法、ラバープレス成形法等で予め焼成
前のセラミック成形体を成形し、焼成前後の双方で機械
加工を施すことにより所望の形状・寸法を得るようにす
るのが一般的であった。Conventionally, in order to obtain a ceramic member having a complicated shape, it is desirable to preform a ceramic molded body before firing by a press molding method, a rubber press molding method or the like and machine it before and after firing. It was common to obtain the shape and size.
【０００５】しかし、このような方法では、複雑な三次
元構造をした形状品を量産化することが難しく、製品コ
ストが著しく高価なものとなり、セラミック製各種部品
の実用化を困難ならしめていた。However, with such a method, it is difficult to mass-produce a shaped article having a complicated three-dimensional structure, and the product cost becomes extremely high, making it difficult to put various ceramic parts into practical use.
【０００６】そこで、前記形状品の成形法として、石膏
型にセラミック泥漿を注入し、型の着肉や吸水を利用し
て成形体を得る鋳込み成形法や、セラミック原料粉末と
有機物を高温にて混練し、流動性を付与させて可塑化状
態とした後、金属製の型に加圧注入することにより成形
する射出成形法が提案されている（特開昭６３−３０２
０２号公報、特開平４−１９３７５８号公報参照）。Therefore, as a method of molding the shaped article, a casting method of injecting ceramic sludge into a gypsum mold to obtain a molded body by utilizing the inking of the mold or water absorption, or a ceramic raw material powder and an organic substance at high temperature An injection molding method has been proposed in which the mixture is kneaded to give fluidity to be in a plasticized state, and then injected into a metal mold under pressure to perform molding (Japanese Patent Laid-Open No. 63-302).
No. 02, Japanese Patent Laid-Open No. 4-193758).
【０００７】[0007]
【発明が解決しようとする課題】しかし乍ら、鋳込み成
形法では、成形型の種類を問わず、該成形型を適宜分割
した組合せ型となし、複雑な三次元構造をした形状を得
んとするのが一般的であるが、前記セラミック泥漿は粘
度が高く、肉厚が大きく変化する成形体では肉厚の薄い
部分に該当する成形型内にセラミック泥漿を均一に充填
させることができず、成形体表面には筋状のフローマー
クと呼ばれる鋳込み不良が発生し易い等の課題があっ
た。However, in the cast molding method, regardless of the type of the molding dies, the molding dies are appropriately divided into combined dies to obtain a shape having a complicated three-dimensional structure. It is common to do, but the ceramic slurry has a high viscosity, it is not possible to uniformly fill the ceramic slurry in the mold corresponding to the thin portion in the molded body with a large change in wall thickness, There has been a problem that casting defects called streaky flow marks are likely to occur on the surface of the molded body.
【０００８】一方、射出成形法では、セラミック粉末に
有機物系バインダーを３０重量％以上添加しないと圧入
可能な流動性が得られず、また、成形後は添加した有機
物系バインダーを除去するために３日間以上の長時間の
脱脂工程を必要とする等、多くの課題があった。On the other hand, in the injection molding method, unless the organic binder is added to the ceramic powder in an amount of 30% by weight or more, fluidity that can be press-fitted cannot be obtained, and after molding, in order to remove the added organic binder, 3 There have been many problems, such as requiring a long-time degreasing step of more than one day.
【０００９】[0009]
【発明の目的】本発明は、前記課題を解消せんとしたも
のであり、フローマーク等の鋳込み不良もなく、脱脂が
極めて容易にできるセラミック成形用組成物を提供する
ことを目的とするものである。An object of the present invention is to solve the above problems, and an object of the present invention is to provide a ceramic molding composition which can be easily degreased without casting defects such as flow marks. is there.
【００１０】[0010]
【課題を解決するための手段】本発明のセラミック成形
用組成物は、セラミック原料粉末に溶媒、固化剤および
有機性分散剤等を加えてセラミック泥漿を調製し、該セ
ラミック泥漿を成形型中へ注入した後、前記固化剤の融
点以下に冷却して成形体を得るために用いるものであっ
て、前記有機性分散剤がアニオン系界面活性剤であり、
また前記溶媒が炭化水素系有機物、前記固化剤がヒドロ
オキシ脂肪酸、ポリアルキレンオキシド誘導体、脂肪酸
エステルまたは脂肪酸アミドのいずれか一種以上、含有
することを特徴とするものである。A ceramic molding composition of the present invention is prepared by adding a solvent, a solidifying agent, an organic dispersant and the like to a ceramic raw material powder to prepare a ceramic slurry, and the ceramic slurry is put into a molding die. After injection, it is used to obtain a molded article by cooling to below the melting point of the solidifying agent, wherein the organic dispersant is an anionic surfactant,
The solvent contains a hydrocarbon organic substance, and the solidifying agent contains one or more of a hydroxy fatty acid, a polyalkylene oxide derivative, a fatty acid ester and a fatty acid amide.
【００１１】前記アニオン系界面活性剤としては、ドデ
シルカルボン酸アンモニウム塩、オクタデカンカルボン
酸アンモニウム塩、ドデシルベンゼンスルホン酸アンモ
ニウム塩やポリオキシエチレン脂肪酸等が好適に使用で
きる。As the anionic surfactant, dodecylcarboxylic acid ammonium salt, octadecanecarboxylic acid ammonium salt, dodecylbenzenesulfonic acid ammonium salt, polyoxyethylene fatty acid and the like can be preferably used.
【００１２】尚、セラミック泥漿中の前記有機性分散剤
の含有率は、０．０５〜５．０重量％が良く、更には
０．３〜１．０重量％がより望ましい。The content of the organic dispersant in the ceramic slurry is preferably 0.05 to 5.0% by weight, more preferably 0.3 to 1.0% by weight.
【００１３】また、前記溶媒は炭化水素系有機物が好ま
しく、より好ましくはその融点が２０℃以下の炭化水素
系有機化合物、例えば炭素数が１０〜１６のパラフィン
混合物、鉱精油や炭素数が１０のノルマル炭化水素等が
望ましい。The solvent is preferably a hydrocarbon organic compound, more preferably a hydrocarbon organic compound having a melting point of 20 ° C. or lower, for example, a paraffin mixture having 10 to 16 carbon atoms, a mineral essential oil, or 10 carbon atoms. Normal hydrocarbon and the like are desirable.
【００１４】尚、セラミック泥漿中の前記溶媒の含有率
は、５〜２５重量％、より好ましくは８〜１５重量％が
望ましい。The content of the solvent in the ceramic slurry is preferably 5 to 25% by weight, more preferably 8 to 15% by weight.
【００１５】前記固化剤は、ヒドロオキシ脂肪酸として
８−ヒドロキシステアリン酸や１２−ヒドロキシステア
リン酸等が、またポリアルキレンオキシド誘導体として
ポリエチレングリコール等が、また脂肪酸エステルとし
て１２−ヒドロキシステアリン酸エチレングリコールエ
ステルや１２−ヒドロキシステアリン酸トリグリセリド
等が、また脂肪酸アミドとしてアセトアミド等があり、
いずれか一種以上からなるものが好ましい。Examples of the solidifying agent include 8-hydroxystearic acid and 12-hydroxystearic acid as hydroxy fatty acids, polyethylene glycol as a polyalkylene oxide derivative, and 12-hydroxystearic acid ethylene glycol ester and 12 as fatty acid esters. -Hydroxystearic acid triglyceride, etc., and fatty acid amides such as acetamide,
Those comprising one or more are preferable.
【００１６】尚、セラミック泥漿中の前記固化剤の含有
率は、３〜２０重量％、より好ましくは５〜１５重量％
が望ましい。The content of the solidifying agent in the ceramic slurry is 3 to 20% by weight, more preferably 5 to 15% by weight.
Is desirable.
【００１７】更に、セラミック泥漿中にアミノ基、カル
ボニル基、カルボキシル基、エステル基または水酸基の
いずれか一種より成る極性基を有する高分子化合物を含
有しても良い。Further, the ceramic slurry may contain a polymer compound having a polar group consisting of any one of an amino group, a carbonyl group, a carboxyl group, an ester group and a hydroxyl group.
【００１８】[0018]
【作用】上記構成によれば、有機性分散剤としてのアニ
オン系界面活性剤は、セラミック泥漿の粘度を低下させ
るように作用する。According to the above construction, the anionic surfactant as the organic dispersant acts to reduce the viscosity of the ceramic slurry.
【００１９】また、溶媒として炭化水素系有機物を使用
することで、セラミック泥漿に可塑性が付与せられ、固
化剤をはじめとするいわゆるバインダー量を低減し、脱
脂が容易となり、寸法精度が向上する。Further, by using a hydrocarbon organic substance as the solvent, plasticity is imparted to the ceramic slurry, so-called binder amount including the solidifying agent is reduced, degreasing is facilitated, and dimensional accuracy is improved.
【００２０】一方、ヒドロキオキシ脂肪酸、ポリアルキ
レンオキシド誘導体、脂肪酸エステルまたは脂肪酸アミ
ドのいずれか一種以上から成る固化剤は、セラミック泥
漿を室温で固化させ、セラミック成形体の強度を向上す
る。On the other hand, the solidifying agent composed of at least one of hydroxyoxy fatty acid, polyalkylene oxide derivative, fatty acid ester and fatty acid amide solidifies the ceramic slurry at room temperature to improve the strength of the ceramic molded body.
【００２１】[0021]
【実施例】以下、本発明のセラミック成形用組成物を実
施例に基づき説明する。EXAMPLES The ceramic molding composition of the present invention will be described below based on examples.
【００２２】本発明に係るセラミック成形用組成物で
は、セラミック原料としてアルミナ（Ａｌ2 Ｏ3 ）、ジ
ルコニア（ＺｒＯ2 ）、窒化珪素（Ｓｉ3 Ｎ4 ）、炭化
珪素（ＳｉＣ）等を用いることができる。In the ceramic molding composition according to the present invention, alumina (Al 2 O 3 ), zirconia (ZrO 2 ), silicon nitride (Si 3 N 4 ), silicon carbide (SiC) or the like is used as a ceramic raw material. it can.
【００２３】また、アルミナの原料粉末にはシリカ（Ｓ
ｉＯ2 ）、カルシア（ＣａＯ）及びマグネシア（Ｍｇ
Ｏ）等を、窒化珪素の原料粉末にはイットリア（Ｙ2 Ｏ
3 ）とアルミナ（Ａｌ2 Ｏ3 ）等を、炭化珪素の原料粉
末にはホウ素（Ｂ）とカーボン（Ｃ）等の各種の焼結助
剤を、ジルコニアの原料粉末にはイットリア（Ｙ
2 Ｏ3）等の安定化剤を所望量添加することができる。Further, silica (S
iO 2 ), calcia (CaO) and magnesia (Mg)
O) or the like, the raw material powder of silicon nitride yttria (Y 2 O
3 ) and alumina (Al 2 O 3 ) and the like, raw material powder of silicon carbide with various sintering aids such as boron (B) and carbon (C), and raw material powder of zirconia with yttria (Y).
A desired amount of stabilizer such as 2 O 3 ) can be added.
【００２４】尚、これらセラミック原料の粒径は、数ミ
クロン乃至サブミクロンのものが好適に用いられる。The particle diameter of these ceramic raw materials is preferably several microns to submicrons.
【００２５】本発明に係るセラミック成形用組成物は、
先ず、主成分として表１に示すセラミック原料粉末に焼
結助剤を加えて湿式混合した後、該混合物を乾燥し、得
られた乾燥原料に対して有機性分散剤、溶媒及び固化剤
等から成るバインダーをそれぞれ表１に示す割合で添加
し、ボールミルにてバインダーの融点より１０℃以上高
い温度で十分に分散混合してセラミック泥漿を調製し
た。The ceramic molding composition according to the present invention is
First, a sintering aid is added to the ceramic raw material powder shown in Table 1 as a main component and wet-mixed, and then the mixture is dried, and an organic dispersant, a solvent, a solidifying agent and the like are added to the obtained dry raw material. Each of the binders was added in the proportions shown in Table 1 and sufficiently dispersed and mixed in a ball mill at a temperature higher than the melting point of the binder by 10 ° C. or more to prepare a ceramic slurry.
【００２６】尚、表１中のバインダーの種類は、表２に
示す通りである。The types of binders in Table 1 are as shown in Table 2.
【００２７】[0027]
【表１】 [Table 1]
【００２８】[0028]
【表２】 [Table 2]
【００２９】次に、セラミック成形体中に気泡が残留す
るのを防止するために、前記セラミック泥漿を真空装置
等で十分に脱泡処理した後、一定の温度に温度調節した
最大外径５０ｍｍのラジアル型ローターの成形型中にセ
ラミック泥漿を注入し、その後、冷却して該セラミック
泥漿を完全に固化させてから前記成形型からセラミック
成形体を取り出した。Next, in order to prevent air bubbles from remaining in the ceramic molded body, the ceramic slurry is sufficiently defoamed by a vacuum device or the like, and then the temperature is adjusted to a constant temperature and the maximum outer diameter is 50 mm. The ceramic slurry was poured into the mold of the radial rotor and then cooled to completely solidify the ceramic slurry, and then the ceramic compact was taken out from the mold.
【００３０】かくして得られたラジアル型ローターの成
形体各１０個についてフローマークの有無を目視検査し
た。Each of the 10 radial rotor moldings thus obtained was visually inspected for flow marks.
【００３１】次いで、前記成形体を、大気中で加熱しな
がら４８時間かけて脱脂した後、燃焼法により該脱脂体
中に残留する炭素をＣＯ2 として赤外線吸収法にて定量
し、炭素残留率を算出した。Next, the molded body was degreased for 48 hours while being heated in the atmosphere, and carbon remaining in the degreased body was quantified by CO 2 as an infrared absorption method by a combustion method to obtain a carbon residual rate. Was calculated.
【００３２】尚、試料番号３３、３４は有機性分散剤と
してノニオン系界面活性剤を用いた比較例である。Sample Nos. 33 and 34 are comparative examples using a nonionic surfactant as an organic dispersant.
【００３３】以上の結果を表３に示す。The above results are shown in Table 3.
【００３４】[0034]
【表３】 [Table 3]
【００３５】表３の結果から明らかなように、有機性分
散剤としてノニオン系界面活性剤を使用した比較例で
は、脱脂体の炭素残留量は少なくよく脱脂されているも
のの、成形体の表面には多量の明確なフローマークが認
められるのに対し、本発明の組成物を用いて成形したセ
ラミック成形体では、いずれもフローマークはなく、か
つ脱脂効率も良好であることが確認できた。As is clear from the results shown in Table 3, in the comparative example using the nonionic surfactant as the organic dispersant, although the degreased body had a small amount of carbon residue and was well degreased, the surface of the molded body was While a large amount of clear flow marks were observed, it was confirmed that the ceramic molded bodies molded using the composition of the present invention did not have flow marks and the degreasing efficiency was good.
【００３６】尚、本発明は前記詳述した実施例に何ら限
定されるものではない。The present invention is not limited to the above-described embodiments.
【００３７】[0037]
【発明の効果】叙上の如く、本発明のセラミック成形用
組成物によれば、セラミック泥漿の粘度を低下させるこ
とができ、その結果セラミック泥漿に可塑性が付与せら
れ、バインダー量を低減できる上、成形が極めて容易と
なり、フローマーク等の鋳込み不良がなく、更に固化剤
が固化する際の結晶化および溶媒の結晶化を防止し、均
一に固化するため脱脂が極めて容易かつ均一に短時間で
完了できる高強度のセラミック成形体を得ることができ
る。As described above, according to the ceramic molding composition of the present invention, it is possible to reduce the viscosity of the ceramic slurry, and as a result, the plasticity is imparted to the ceramic slurry and the amount of the binder can be reduced. , Molding is extremely easy, there are no casting defects such as flow marks, and further crystallization when the solidifying agent is solidified and the crystallization of the solvent are prevented, and uniform solidification makes degreasing extremely easy and uniform in a short time. It is possible to obtain a high-strength ceramic molded body that can be completed.
Claims (3)
有機性分散剤等を加えてセラミック泥漿を調製し、該セ
ラミック泥漿を成形型中へ注入した後、前記固化剤の融
点以下に冷却して成形体を得るセラミック成形用組成物
であって、前記有機性分散剤がアニオン系界面活性剤で
あることを特徴とするセラミック成形用組成物。1. A ceramic raw material powder is prepared by adding a solvent, a solidifying agent, an organic dispersant and the like to a ceramic raw material powder, and after pouring the ceramic slurry into a molding die, it is cooled to a temperature not higher than the melting point of the solidifying agent. A ceramic molding composition for obtaining a molded body, wherein the organic dispersant is an anionic surfactant.
特徴とする請求項１記載のセラミック成形用組成物。2. The ceramic molding composition according to claim 1, wherein the solvent is a hydrocarbon organic substance.
ルキレンオキシド誘導体、脂肪酸エステルまたは脂肪酸
アミドのいずれか一種以上であることを特徴とする請求
項１記載のセラミック成形用組成物。3. The ceramic molding composition according to claim 1, wherein the solidifying agent is one or more of hydroxy fatty acid, polyalkylene oxide derivative, fatty acid ester and fatty acid amide.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4293163A JPH06144919A (en) | 1992-10-30 | 1992-10-30 | Ceramic molding composition |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4293163A JPH06144919A (en) | 1992-10-30 | 1992-10-30 | Ceramic molding composition |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH06144919A true JPH06144919A (en) | 1994-05-24 |
Family
ID=17791236
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP4293163A Pending JPH06144919A (en) | 1992-10-30 | 1992-10-30 | Ceramic molding composition |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH06144919A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102825649A (en) * | 2012-07-18 | 2012-12-19 | 武汉理工大学 | Method for preparing MgAlON transparent ceramic bisque by gel casting and molding |
-
1992
- 1992-10-30 JP JP4293163A patent/JPH06144919A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102825649A (en) * | 2012-07-18 | 2012-12-19 | 武汉理工大学 | Method for preparing MgAlON transparent ceramic bisque by gel casting and molding |
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