JP2968939B2 - Freezing molding method of ceramics using polyvinyl alcohol solution - Google Patents
Freezing molding method of ceramics using polyvinyl alcohol solutionInfo
- Publication number
- JP2968939B2 JP2968939B2 JP7334737A JP33473795A JP2968939B2 JP 2968939 B2 JP2968939 B2 JP 2968939B2 JP 7334737 A JP7334737 A JP 7334737A JP 33473795 A JP33473795 A JP 33473795A JP 2968939 B2 JP2968939 B2 JP 2968939B2
- Authority
- JP
- Japan
- Prior art keywords
- frozen
- molded body
- mold
- freeze
- frozen molded
- 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
- Compositions Of Oxide Ceramics (AREA)
- Devices For Post-Treatments, Processing, Supply, Discharge, And Other Processes (AREA)
- Compositions Of Macromolecular Compounds (AREA)
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、セラミックスの凍
結成形法に係り、更に詳しくは、成形体の離型が容易に
実施でき、離型時に成形体の変形や表面状態の悪化など
が起こりにくいセラミックスの凍結成形法に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for freeze-forming ceramics, and more particularly, to a method for easily releasing a molded product from a mold, and it is unlikely that the molded product is deformed or deteriorated in the surface state at the time of release. The present invention relates to a freeze molding method for ceramics.
【０００２】[0002]
【従来の技術】セラミックスの成形法として、従来、プ
レス成形、射出成形、鋳込成形など各種方法が知られて
いるが、このような成形法の１つとして、近年、凍結成
形法と呼ばれる成形法が注目されている。セラミックス
の凍結成形法は、セラミック粉末を水等の分散媒と混合
し、得られた混合物（原料スラリー）を成形型に充填し
て、これを凍結・硬化させることにより、所望の形状の
凍結成形体を得る成形法であり、複雑形状の付与が可能
であること、成形型材の自由度が大きいこと等の利点が
ある。2. Description of the Related Art Conventionally, various methods such as press molding, injection molding, and cast molding are known as a method of molding ceramics. One of such molding methods has recently been called a freeze molding method. The law is drawing attention. Freezing molding of ceramics is performed by mixing ceramic powder with a dispersion medium such as water, filling the resulting mixture (raw material slurry) into a mold, and freezing and hardening the mixture to obtain a desired shape. This is a molding method for obtaining a body, and has the advantages that a complicated shape can be given and that the degree of freedom of a molding die is large.
【０００３】[0003]
【発明が解決しようとする課題】しかしながら、従来の
凍結成形法においては、成形型として金属型、樹脂型等
を用いた場合、セラミック粉末と分散媒との混合物が凍
結した際に、凍結成形体表面が成形型内面に固着して、
凍結成形体の離型が困難となるという問題があった。そ
して、このように凍結成形体表面が成形型内面に固着し
た状態で、無理に離型を実施しようとすると、凍結成形
体が変形あるいは破壊するおそれがあった。However, in the conventional freeze molding method, when a metal mold, a resin mold, or the like is used as a molding die, when a mixture of a ceramic powder and a dispersion medium is frozen, the frozen molded body is frozen. The surface adheres to the inner surface of the mold,
There is a problem that it is difficult to release the frozen molded body. When the mold is forcibly released in a state where the surface of the frozen molded body is fixed to the inner surface of the mold, the frozen molded body may be deformed or broken.
【０００４】本発明は、このような事情に鑑みてなされ
たものであり、その目的とするところは、凍結成形体の
離型が容易で、離型の際の凍結成形体の変形や破壊など
が起こりにくいセラミックスの凍結成形法を提供するこ
とにある。The present invention has been made in view of such circumstances, and an object of the present invention is to make it easy to release a frozen molded product, and to deform or break the frozen molded product upon release. It is an object of the present invention to provide a ceramics freezing molding method in which cracking is less likely to occur.
【０００５】[0005]
【課題を解決するための手段】本発明によれば、セラミ
ック粉末と分散媒との混合物を成形型内に充填し、これ
を凍結・硬化させた後、凍結成形体を離型するセラミッ
クスの凍結成形法において、前記分散媒としてケン化度
８５モル％以上のポリビニルアルコールを使用して作製
したポリビニルアルコール溶液を用い、前記混合物を成
形型内で凍結・硬化させた後、凍結成形体の表面の温度
を上昇させて、凍結成形体の表層部を粘着性ゲルに転化
させてから離型することを特徴とするセラミックスの凍
結成形法、が提供される。According to the present invention, a mixture of ceramic powder and a dispersion medium is filled in a mold, frozen and hardened, and then the frozen molded body is released. In the molding method, a polyvinyl alcohol solution prepared by using polyvinyl alcohol having a degree of saponification of 85 mol% or more as the dispersion medium is used. The mixture is frozen and cured in a molding die. There is provided a method for freeze-forming ceramics, which comprises raising the temperature to convert the surface layer of the freeze-formed body into an adhesive gel, and then releasing the mold.
【０００６】[0006]
【発明の実施の形態】ポリビニルアルコール（ＰＶＡ）
溶液は、一旦凍結した後、解凍することにより、粘着性
ゲルに転化する性質があることが知られている。本発明
の凍結成形法は、ＰＶＡ溶液のこのような性質を利用し
たものであり、原料スラリー（セラミック粉末と分散媒
との混合物）の分散媒としてＰＶＡ溶液を用いること、
及び凍結成形体の離型を実施する前に、凍結成形体の表
面の温度を上昇させることを主な特徴とする。DETAILED DESCRIPTION OF THE INVENTION Polyvinyl alcohol (PVA)
It is known that a solution has a property of being converted into a sticky gel by being frozen and then thawed. The freeze molding method of the present invention utilizes such properties of a PVA solution, and uses a PVA solution as a dispersion medium of a raw material slurry (a mixture of a ceramic powder and a dispersion medium).
The main feature is that the temperature of the surface of the frozen molded body is increased before the release of the frozen molded body.
【０００７】ＰＶＡ溶液を用いて作製した原料スラリー
を凍結・硬化させた後の凍結成形体は、その表面の温度
を融解温度以上にしても、凍結成形体表層部が溶融する
ことはなく、粘着性ゲルへと転化するため、凍結成形時
の形状を保ったままの状態で離型が可能となり、離型時
の表面状態の悪化も起こらない。また、凍結成形体の表
面の温度を上昇させることによって、凍結成形体表面と
成形型内面との凍結による固着状態が解消され、凍結成
形体に無理な力を加えなくても離型できるので、離型時
の破壊や変形などが抑制される。離型後の凍結成形体
は、凝固点以下に冷却して再度凍結することにより、型
から分離されたままの良好な形状及び表面状態を維持す
ることができ、その後の工程（乾燥、焼成等）に供され
る。[0007] The frozen molded body obtained by freezing and hardening the raw material slurry prepared using the PVA solution does not melt the surface layer portion of the frozen molded body even if the surface temperature thereof is higher than the melting temperature, and the adhesive does not stick. Since the gel is converted into a functional gel, the mold can be released while maintaining the shape at the time of freeze molding, and the surface condition at the time of release does not deteriorate. Also, by raising the temperature of the surface of the frozen molded body, the frozen state of the surface of the frozen molded body and the inner surface of the molding die is eliminated, and the mold can be released without applying excessive force to the frozen molded body. Breakage and deformation at the time of mold release are suppressed. By cooling the frozen molded body after release from the mold to a temperature below the freezing point and freezing again, it is possible to maintain a good shape and surface state as it is separated from the mold, and the subsequent steps (drying, firing, etc.) To be served.
【０００８】以下、本発明を詳しく説明する。本発明で
使用されるセラミック粉末としては、特にその種類を限
定するものではなく、例えばアルミナ、窒化珪素、炭化
珪素、ジルコニア、サイアロン等の粉末が使用できる。
また、これらの焼結体特性等を改良するために、種々の
助剤を加えたものも使用できる。Hereinafter, the present invention will be described in detail. The type of the ceramic powder used in the present invention is not particularly limited, and powders such as alumina, silicon nitride, silicon carbide, zirconia, and sialon can be used.
Further, in order to improve the properties of these sintered bodies, those to which various auxiliaries are added can be used.
【０００９】また、原料スラリーの作製に用いるＰＶＡ
溶液には、ケン化度が８５モル％以上、好ましくは９５
モル％以上のＰＶＡを使用する。ＰＶＡのケン化度が８
５モル％未満では、凍結成形体の表面温度を上昇させた
ときに表層部が溶融して形状が保てなくなり、表面状態
も悪くなる。Further, PVA used for producing a raw material slurry
The solution has a degree of saponification of 85 mol% or more, preferably 95 mol% or more.
Mole% or more of PVA is used. The degree of saponification of PVA is 8
If the amount is less than 5 mol%, the surface layer will melt and the shape cannot be maintained when the surface temperature of the frozen molded body is increased, and the surface state will also deteriorate.
【００１０】ＰＶＡ溶液の溶媒としては、水系、非水系
のいずれの溶媒も使用することができるが、当然にＰＶ
Ａが溶解するものに限定される。したがって、例えば、
メタノールやエタノールは使用できない。ただし、メタ
ノールやエタノールと水との混合溶媒は使用可能であ
る。また、必要に応じ、分散剤、結合剤、消泡剤、界面
活性剤等の添加物を加えたものも使用できる。As a solvent for the PVA solution, any of an aqueous solvent and a non-aqueous solvent can be used.
A is limited to those in which A dissolves. So, for example,
Methanol or ethanol cannot be used. However, a mixed solvent of methanol or ethanol and water can be used. If necessary, additives to which additives such as a dispersant, a binder, an antifoaming agent and a surfactant are added can also be used.
【００１１】なお、原料スラリーの分散媒にＰＶＡ溶液
以外のものを用いた場合には、凍結成形体の表面の温度
を上昇させても、表層部の粘着性ゲルへの転化は起こら
ず、通常は表層部が溶融する。このため、離型は容易に
なるものの、凍結成形時の形状が保てず、凍結成形体の
表面状態の悪化も避けられない。したがって、この場合
には、形状や表面状態を修正するための後工程、すなわ
ち成形体又は焼結体の段階での機械加工が必須となる。When a material other than the PVA solution is used as the dispersion medium for the raw material slurry, even if the temperature of the surface of the frozen molded body is increased, conversion to the adhesive gel on the surface layer does not take place. The surface layer is melted. For this reason, although mold release becomes easy, the shape at the time of freeze molding cannot be maintained, and deterioration of the surface state of the frozen molded body cannot be avoided. Therefore, in this case, a post-process for correcting the shape and the surface state, that is, machining at the stage of the formed body or the sintered body is essential.
【００１２】セラミック粉末とＰＶＡ溶液との比率とし
ては、混合物中のセラミック粉末の体積濃度が６０％以
下であることが好ましい。また、原料スラリー中のＰＶ
Ａの量は、好ましくは０．０５〜２０重量％、更に好ま
しくは１〜５重量％とする。The ratio of the ceramic powder to the PVA solution is preferably such that the volume concentration of the ceramic powder in the mixture is 60% or less. In addition, PV in the raw material slurry
The amount of A is preferably 0.05 to 20% by weight, more preferably 1 to 5% by weight.
【００１３】本発明において、原料スラリーの凍結・硬
化後に凍結成形体の表面温度を上昇させる手段として
は、成形型を加熱してもよいが、原料スラリーの凍結・
硬化後、大気中に放置して、凍結成形体の表層部がゲル
転化する温度まで上昇するのを待つようにしてもよい。
このように表面温度を上昇させることによって粘着性ゲ
ルに転化させる凍結成形体表層部の厚みは、できるだけ
薄くすることが好ましく、厚くてもせいぜい２ｍｍ程度
までとすることが好ましい。あまり深層部までゲル転化
させると変形が生じるおそれがある。In the present invention, as a means for raising the surface temperature of the frozen molded body after freezing and hardening of the raw material slurry, the molding die may be heated.
After hardening, it may be left in the air and wait for the surface portion of the frozen molded body to rise to a temperature at which gel conversion occurs.
It is preferable that the thickness of the surface layer portion of the frozen molded body converted into the adhesive gel by increasing the surface temperature is reduced as much as possible, and it is preferable that the thickness be at most about 2 mm. If the gel is converted to a too deep portion, deformation may occur.
【００１４】なお、離型後の凍結成形体は、通常、焼成
を行う前に乾燥する必要がある。一般に、セラミック凍
結成形体の乾燥は、凍結成形体を凍結状態のまま真空下
に保持し、分散媒を昇華させる凍結乾燥法により行われ
る。したがって、離型後の表層部がゲル化した凍結成形
体は、再び凝固点以下の温度に冷却して、離型時の形状
を保ったままの状態で再度凍結し、その後凍結乾燥を行
うようにする。凍結乾燥法以外の乾燥法、例えば調湿乾
燥や自然乾燥により凍結成形体の乾燥を行う場合には、
必ずしも凍結成形体を再度凍結してから乾燥を行わなく
てもよいが、この場合にも乾燥後の成形体の均質性等を
考慮すると、乾燥前に再度凍結しておくことが好まし
い。It is to be noted that the frozen molded product after release must be dried before firing. In general, drying of the ceramic frozen molded body is performed by a freeze-drying method in which the frozen molded body is kept in a frozen state under vacuum and the dispersion medium is sublimated. Therefore, the frozen molded body having a gelled surface layer after release is cooled again to a temperature below the freezing point, frozen again while maintaining the shape at the time of release, and then freeze-dried. I do. When drying the frozen molded body by a drying method other than the freeze drying method, for example, humidity drying or natural drying,
It is not always necessary to dry the frozen molded body again after freezing it. However, in this case as well, it is preferable to freeze again before drying in consideration of the homogeneity of the dried molded body.
【００１５】本発明の凍結成形法により得られた凍結成
形体は、上記凍結乾燥法などによって乾燥した後、一般
的なセラミックスの焼成工程により、焼結体とすること
ができる。本発明により得られた成形体は、離型の際に
無理な力が加わっていないので、離型時の変形が小さ
く、また表面状態も良好なので、最終的に得られるセラ
ミック焼結体も形状精度や表面状態が優れたものとな
る。The freeze-molded product obtained by the freeze-forming method of the present invention can be made into a sintered body by a general ceramic firing step after drying by the freeze-drying method or the like. Since the molded body obtained by the present invention does not apply excessive force at the time of mold release, the deformation at the time of mold release is small and the surface condition is good, so that the finally obtained ceramic sintered body also has the shape. The accuracy and surface condition are excellent.
【００１６】[0016]
【実施例】以下、本発明を実施例に基づいて更に詳細に
説明するが、本発明はこれらの実施例に限定されるもの
ではない。EXAMPLES Hereinafter, the present invention will be described in more detail with reference to examples, but the present invention is not limited to these examples.
【００１７】〔実施例〕水にケン化度９９モル％のＰＶ
Ａと分散剤（ポリカルボン酸アンモニウム塩）を添加し
て分散媒とし、これにセラミック粉末として窒化珪素粉
末を混合し、−７０cmHgで３分間真空脱泡して、窒化珪
素粉末の体積濃度が３５容積％、ＰＶＡ量が２重量％の
原料スラリーを作製した。この原料スラリーを使用し
て、寸法５０×５０×１５mmの角板を凍結成形法により
成形した。成形方法としては、上記寸法の成形部を有す
るアルミ合金製成形型（分割型）に、原料スラリーを
０．５kg/cm2の圧力で充填し、成形型を約−７０℃に冷
却して、原料スラリーを凍結させた。[Example] PV having a saponification degree of 99 mol% in water
A and a dispersant (polyammonium carboxylate) were added to form a dispersion medium, and silicon nitride powder was mixed as a ceramic powder with the mixture, followed by vacuum degassing at -70 cmHg for 3 minutes to give a silicon nitride powder having a volume concentration of 35 A raw material slurry having a volume% and a PVA amount of 2% by weight was prepared. Using this raw material slurry, a square plate having a size of 50 × 50 × 15 mm was formed by a freeze molding method. As a molding method, an aluminum alloy molding die (split mold) having a molding portion having the above dimensions is filled with the raw material slurry at a pressure of 0.5 kg / cm 2 , and the molding die is cooled to about −70 ° C. The raw slurry was frozen.
【００１８】その後、アルミ合金製成形型の温度が５℃
になるまで大気中に放置し、凍結成形体の表面温度を融
解温度以上としてから、凍結成形体の離型を実施した。
凍結成形体は、型割りを実施するだけで容易に離型でき
た。また、離型時に凍結成形体の表面温度を融解温度以
上にしても、成形体表層部が溶融せず、ゲル化したた
め、凍結成形時の形状を保ったまま離型でき、成形体の
表面状態も良好であった。Thereafter, the temperature of the aluminum alloy mold is set to 5 ° C.
, And the surface temperature of the frozen molded body was set to the melting temperature or higher, and then the frozen molded body was released.
The frozen molded body was easily released from the mold simply by performing the mold splitting. In addition, even if the surface temperature of the frozen molded body is equal to or higher than the melting temperature at the time of release, the surface layer portion of the molded body does not melt and is gelled, so the mold can be released while maintaining the shape at the time of the freeze molding, and the surface state of the molded body Was also good.
【００１９】離型後、得られた凍結成形体を、そのまま
の状態で再度凍結してから、約０．１Torrで−２０℃×
４０時間の凍結乾燥を実施した。乾燥後の成形体につい
てその表面の平面度を測定したところ、結果は表１に示
すとおり０．１１ｍｍと小さく、成形型内面の形状を充
分に保ったまま、離型及び乾燥が実施されていることが
確認された。After release from the mold, the obtained frozen molded body is frozen again as it is, and thereafter, is -20 ° C. × about 0.1 Torr.
Lyophilization was performed for 40 hours. When the flatness of the surface of the dried molded body was measured, the result was as small as 0.11 mm as shown in Table 1. The mold release and drying were performed while the shape of the inner surface of the mold was sufficiently maintained. It was confirmed that.
【００２０】〔比較例１〕分散媒にＰＶＡが添加されて
いない以外は、実施例と同様にして凍結成形を実施し
た。その後、アルミ合金製成形型の温度が５℃になるま
で大気中に放置し、凍結成形体の表面温度を融解温度以
上としてから、凍結成形体の離型を実施したところ、成
形体表層部が溶融して、表面状態が悪化した。また、離
型後、得られた凍結成形体をそのままの状態で再度凍結
してから、実施例と同様に凍結乾燥を行い、乾燥後の成
形体表面の平面度を測定したところ、結果は表１に示す
とおり０．９２ｍｍと大きく、成形型内面の形状が全く
保たれていないことが確認された。Comparative Example 1 Freezing was performed in the same manner as in Example except that PVA was not added to the dispersion medium. Thereafter, the mold was made to stand in the atmosphere until the temperature of the aluminum alloy mold reached 5 ° C., and after the surface temperature of the frozen compact was set to the melting temperature or higher, the mold was released from the frozen compact. It melted and the surface condition deteriorated. After release from the mold, the obtained frozen molded body was frozen again as it was, and then freeze-dried in the same manner as in the example, and the flatness of the dried molded body surface was measured. As shown in FIG. 1, it was as large as 0.92 mm, and it was confirmed that the shape of the inner surface of the mold was not maintained at all.
【００２１】〔比較例２〕ケン化度７５モル％のＰＶＡ
を用いた以外は、実施例と同様にして凍結成形を実施し
た。その後、アルミ合金製成形型の温度が５℃になるま
で大気中に放置し、凍結成形体の表面温度を融解温度以
上としてから、凍結成形体の離型を実施したところ、成
形体表層部が溶融して、表面状態が悪化した。また、離
型後、得られた凍結成形体をそのままの状態で再度凍結
してから、実施例と同様に凍結乾燥を行い、乾燥後の成
形体表面の平面度を測定したところ、結果は表１に示す
とおり０．８４ｍｍと大きく、成形型内面の形状が全く
保たれていないことが確認された。Comparative Example 2 PVA having a saponification degree of 75 mol%
Freezing was carried out in the same manner as in Example except that was used. Thereafter, the mold was made to stand in the atmosphere until the temperature of the aluminum alloy mold reached 5 ° C., and after the surface temperature of the frozen compact was set to the melting temperature or higher, the mold was released from the frozen compact. It melted and the surface condition deteriorated. After release from the mold, the obtained frozen molded body was frozen again as it was, and then freeze-dried in the same manner as in the example, and the flatness of the dried molded body surface was measured. As shown in FIG. 1, it was as large as 0.84 mm, and it was confirmed that the shape of the inner surface of the mold was not maintained at all.
【００２２】[0022]
【表１】 [Table 1]
【００２３】[0023]
【発明の効果】以上説明したように、本発明によれば、
凍結成形体の表面の温度を上昇させることによって、凍
結成形体表面と成形型内面との凍結による固着状態が解
消され、凍結成形体に無理な力を加えなくても容易に離
型できるので、離型時の破壊や変形などが抑制される。
また、原料スラリーの分散媒としてＰＶＡ溶液を用いた
ことにより、凍結成形体は、その表面温度を上昇せさて
も表層部が溶融せずに、粘着性ゲルへと転化するため、
凍結成形時の形状を保ったままの状態で離型でき、表面
状態の悪化も起こらない。このように本発明により得ら
れた凍結成形体は形状精度や表面状態が良好なものなの
で、表面状態や形状を修正するための後工程（成形体又
は焼結体の段階での機械加工）を必ずしも必要とせず、
工程削減及び製造コストの低減が可能となる。As described above, according to the present invention,
By increasing the temperature of the surface of the frozen molded body, the frozen state of the surface of the frozen molded body and the inner surface of the molding die due to freezing is eliminated, and the mold can be easily released without applying excessive force to the frozen molded body. Breakage and deformation at the time of mold release are suppressed.
Further, by using the PVA solution as a dispersion medium of the raw material slurry, the frozen molded body is converted into a sticky gel without melting the surface layer even if the surface temperature is increased,
The mold can be released while maintaining the shape at the time of freeze molding, and the surface condition does not deteriorate. As described above, since the frozen molded body obtained by the present invention has good shape accuracy and surface state, a post-process (machining at the stage of the molded body or sintered body) for correcting the surface state and shape is performed. Not necessarily required,
Process reduction and manufacturing cost can be reduced.
フロントページの続き (56)参考文献 特開 平８−267419（ＪＰ，Ａ) 特開 平４−265701（ＪＰ，Ａ) 特開 昭62−192502（ＪＰ，Ａ) 特開 昭62−124902（ＪＰ，Ａ) 特表 平２−503012（ＪＰ，Ａ) (58)調査した分野(Int.Cl.6，ＤＢ名) B28B 1/00 C04B 35/622 C04B 35/632 Continuation of the front page (56) References JP-A-8-267419 (JP, A) JP-A-4-265701 (JP, A) JP-A-62-192502 (JP, A) JP-A-62-124902 (JP) (A) Special table Hei 2 503012 (JP, A) (58) Fields investigated (Int. Cl. 6 , DB name) B28B 1/00 C04B 35/622 C04B 35/632
Claims (2)
形型内に充填し、これを凍結・硬化させた後、凍結成形
体を離型するセラミックスの凍結成形法において、前記
分散媒としてケン化度８５モル％以上のポリビニルアル
コールを使用して作製したポリビニルアルコール溶液を
用い、前記混合物を成形型内で凍結・硬化させた後、凍
結成形体の表面の温度を上昇させて、凍結成形体の表層
部を粘着性ゲルに転化させてから離型することを特徴と
するセラミックスの凍結成形法。1. A method for filling a mixture of a ceramic powder and a dispersion medium into a mold, freezing and hardening the mixture, and then releasing the frozen molded body. The mixture was frozen and hardened in a mold using a polyvinyl alcohol solution prepared using polyvinyl alcohol having a degree of 85 mol% or more, and then the temperature of the surface of the frozen molded body was increased to obtain a frozen molded body. A freeze molding method for ceramics, which comprises releasing a mold after converting a surface layer into an adhesive gel.
保ったままの状態で再度凍結する請求項１記載のセラミ
ックスの凍結成形法。2. The method according to claim 1, wherein the frozen molded body after releasing is frozen again while maintaining its shape.
Priority Applications (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7334737A JP2968939B2 (en) | 1995-12-22 | 1995-12-22 | Freezing molding method of ceramics using polyvinyl alcohol solution |
| US08/622,406 US5861115A (en) | 1995-03-29 | 1996-03-27 | Method for freeze molding |
| DE19612386A DE19612386A1 (en) | 1995-03-29 | 1996-03-28 | Freeze moulding process for prodn. of ceramic mouldings |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7334737A JP2968939B2 (en) | 1995-12-22 | 1995-12-22 | Freezing molding method of ceramics using polyvinyl alcohol solution |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH09174523A JPH09174523A (en) | 1997-07-08 |
| JP2968939B2 true JP2968939B2 (en) | 1999-11-02 |
Family
ID=18280662
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP7334737A Expired - Lifetime JP2968939B2 (en) | 1995-03-29 | 1995-12-22 | Freezing molding method of ceramics using polyvinyl alcohol solution |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2968939B2 (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2004035281A1 (en) * | 2002-10-16 | 2004-04-29 | Ngk Insulators, Ltd. | Method for producing ceramic formed article |
| US7517490B2 (en) | 2002-10-16 | 2009-04-14 | Ngk Insulators, Ltd. | Method of manufacturing ceramic green body |
| JP5103346B2 (en) * | 2008-10-01 | 2012-12-19 | 日本碍子株式会社 | Method for producing ceramic molded body and method for producing ceramic member |
| JP2010241129A (en) * | 2009-03-19 | 2010-10-28 | Ngk Insulators Ltd | Method of producing powder compact |
-
1995
- 1995-12-22 JP JP7334737A patent/JP2968939B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH09174523A (en) | 1997-07-08 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US4671912A (en) | Method of manufacturing sintered ceramic body | |
| JPH0147428B2 (en) | ||
| US4708838A (en) | Method for fabricating large cross section injection molded ceramic shapes | |
| JP2968939B2 (en) | Freezing molding method of ceramics using polyvinyl alcohol solution | |
| GB2232115A (en) | Ceramic castings | |
| CN104108938A (en) | Preparation method for Sialon ceramic | |
| EP0361238B1 (en) | Method of joining porous silicon carbide bodies | |
| US5861115A (en) | Method for freeze molding | |
| JPH05194037A (en) | Water extrusion of silicon nitride | |
| JP2002037682A (en) | Porous silicon carbide sintered body and its manufacturing method | |
| JPH05505588A (en) | Improved method for producing large cross-section injection molded or slip cast ceramic bodies | |
| JP5067751B2 (en) | Ceramic joined body and manufacturing method thereof | |
| JPH05503683A (en) | Method for producing large cross-section injection molded or slip cast ceramic bodies | |
| JP3320645B2 (en) | Manufacturing method of ceramic sintered body | |
| KR20030013542A (en) | Method for Manufacturing Homogeneous Green Bodies from the Powders of Multimodal Particle Size Distribution Using Centrifugal Casting | |
| JP2002292613A (en) | Method for manufacturing ceramic molding | |
| JP3017066B2 (en) | Method for freeze-drying ceramic frozen molded body and drying jig used for the method | |
| JP2001089270A (en) | Method of producing silicon impregnated silicon carbide ceramic member | |
| CN114133252B (en) | AlON transparent ceramic conformal infrared head cover and preparation method thereof | |
| JP3202670B2 (en) | Manufacturing method of multilayer ceramics | |
| US20230234894A1 (en) | Method for producing metal matrix composite and method for preparing preform | |
| JPH09155838A (en) | Freeze molding of ceramics | |
| JP3136627B2 (en) | Manufacturing method of preform for composite material | |
| JPH10297971A (en) | Production of sheet-like silicon carbide sintered compact | |
| JP2876521B2 (en) | Manufacturing method of aluminum nitride sintered body |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| A01 | Written decision to grant a patent or to grant a registration (utility model) |
Free format text: JAPANESE INTERMEDIATE CODE: A01 Effective date: 19990810 |