JPH01244806A - Molding method for ceramic molded body - Google Patents
Molding method for ceramic molded bodyInfo
- Publication number
- JPH01244806A JPH01244806A JP7255188A JP7255188A JPH01244806A JP H01244806 A JPH01244806 A JP H01244806A JP 7255188 A JP7255188 A JP 7255188A JP 7255188 A JP7255188 A JP 7255188A JP H01244806 A JPH01244806 A JP H01244806A
- Authority
- JP
- Japan
- Prior art keywords
- ceramic
- molded body
- lower frame
- ceramic molded
- model plate
- 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.)
- Granted
Links
- 239000000919 ceramic Substances 0.000 title claims abstract description 54
- 238000000034 method Methods 0.000 title claims abstract description 10
- 238000000465 moulding Methods 0.000 title claims description 5
- 239000002002 slurry Substances 0.000 claims abstract description 22
- 239000002904 solvent Substances 0.000 claims abstract description 5
- 239000012528 membrane Substances 0.000 claims description 17
- 239000008187 granular material Substances 0.000 claims description 11
- 239000013618 particulate matter Substances 0.000 claims description 10
- 238000002347 injection Methods 0.000 claims description 2
- 239000007924 injection Substances 0.000 claims description 2
- 238000005266 casting Methods 0.000 abstract description 5
- 239000011148 porous material Substances 0.000 description 4
- 239000011505 plaster Substances 0.000 description 3
- PEDCQBHIVMGVHV-UHFFFAOYSA-N Glycerine Chemical compound OCC(O)CO PEDCQBHIVMGVHV-UHFFFAOYSA-N 0.000 description 2
- 239000002253 acid Substances 0.000 description 2
- 239000011230 binding agent Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000000843 powder Substances 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 239000004925 Acrylic resin Substances 0.000 description 1
- 229920000178 Acrylic resin Polymers 0.000 description 1
- 239000002202 Polyethylene glycol Substances 0.000 description 1
- 239000004642 Polyimide Substances 0.000 description 1
- 239000004743 Polypropylene Substances 0.000 description 1
- SMEGJBVQLJJKKX-HOTMZDKISA-N [(2R,3S,4S,5R,6R)-5-acetyloxy-3,4,6-trihydroxyoxan-2-yl]methyl acetate Chemical compound CC(=O)OC[C@@H]1[C@H]([C@@H]([C@H]([C@@H](O1)O)OC(=O)C)O)O SMEGJBVQLJJKKX-HOTMZDKISA-N 0.000 description 1
- 229940081735 acetylcellulose Drugs 0.000 description 1
- 229920002301 cellulose acetate Polymers 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 239000000839 emulsion Substances 0.000 description 1
- 235000011187 glycerol Nutrition 0.000 description 1
- 238000001746 injection moulding Methods 0.000 description 1
- CSNNHWWHGAXBCP-UHFFFAOYSA-L magnesium sulphate Substances [Mg+2].[O-][S+2]([O-])([O-])[O-] CSNNHWWHGAXBCP-UHFFFAOYSA-L 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 229920000620 organic polymer Polymers 0.000 description 1
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 description 1
- 238000005373 pervaporation Methods 0.000 description 1
- 229920001223 polyethylene glycol Polymers 0.000 description 1
- 229920001721 polyimide Polymers 0.000 description 1
- 239000002952 polymeric resin Substances 0.000 description 1
- -1 polypropylene Polymers 0.000 description 1
- 229920001155 polypropylene Polymers 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
- 239000004575 stone Substances 0.000 description 1
Abstract
Description
【発明の詳細な説明】
（産業上の利用分野）
本発明は、高温用ブロア翼、ガスタービン翼等の複雑形
状のセラミックス成形体を成形するのに好適な方法に関
する。DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a method suitable for molding complex-shaped ceramic molded bodies such as high-temperature blower blades and gas turbine blades.
（従来技術と問題点）
一般に複雑形状のセラミックス成形体は、鋳込み成形法
や射出成形法により成形されているが、当該セラミック
ス成形体は、抜型が困難なため、それを複数個に分割し
たものを別々に成形した後組み合わせて一体化するよう
にして成形したり、それの成形型として、複数個に分割
した構造の石こう型を使用するようにしている。したが
って、前者では、各部材同士の組み付けが良好になるよ
うに各部材を精曵高く成形する必要があってコスト高に
なる上に、接合部分の嵌合が非常にむずかしく、また、
後者では、石こう型の分割方法や単段を考慮する必要が
あって非常に厄介な上に、石こう型の製作に費用がかか
るなどの問題があった。(Prior art and problems) Ceramic molded bodies with complex shapes are generally molded by casting or injection molding, but since it is difficult to remove the ceramic molded bodies from the mold, they are divided into multiple pieces. They are molded separately and then combined and molded into one, or a plaster mold with a structure divided into multiple pieces is used as a mold for it. Therefore, in the former case, it is necessary to mold each member with great precision so that they can be assembled well, which increases costs, and it is very difficult to fit the joints together.
The latter method requires consideration of the method of dividing the plaster mold and the single stage, which is extremely troublesome, and also poses problems such as the cost of manufacturing the plaster mold.
（発明の目的）
本発明は上記の問題を解消するためになされたもので、
複雑形状のセラミックス成形体を容易に成形し得る方法
を提供することを目的とする。(Object of the invention) The present invention has been made to solve the above problems.
It is an object of the present invention to provide a method for easily molding a ceramic molded body having a complicated shape.
（問題点を解決するための手段）
本発明におけるセラミックス成形体の成形方法は、下型
模型板の表面に浸透性膜を吸着させた後、該下型模型板
上に下枠を載置し、該下枠内に粒状物を充填した後前記
下枠の上端開口部を非通気性の遮蔽膜で閉鎖し、前記浸
透性膜、下枠および遮蔽膜で画成された粒状物充填の空
間内を吸引減圧して該粒状物を固形化し、該画形化粒状
物内蔵の下枠を前記下型模型板から分離して下型を製造
し、該下型の凹み内に、加圧注入によりあらかじめ別途
成形した部分セラミックス成形体をセットし、前記下型
に、該下型と同様にして製造した上型を型合せして部分
セラミックス成形体内蔵の製品キャビティを画成し、該
製品キャビティ内にセラミックススラリーを加圧注入し
、該セラミックススラリーからスラリー溶媒を吸引除去
してセラミックスを固形化し、前記上・下型の粒状物の
固形化状態を解き、もって部分セラミックス成形体を含
むセラミックス成形体を得ることを特徴とするものであ
る。(Means for Solving the Problems) The method for forming a ceramic molded body according to the present invention includes adsorbing a permeable membrane onto the surface of a lower model plate, and then placing a lower frame on the lower model plate. After filling the lower frame with particulate matter, the upper end opening of the lower frame is closed with a non-breathable shielding membrane, and a space for filling the particulate matter defined by the permeable membrane, the lower frame and the shielding membrane is closed. The granules are solidified by suctioning and depressurizing the interior, the lower frame containing the image-shaped granules is separated from the lower model plate to produce a lower mold, and pressure is injected into the recess of the lower mold. A partial ceramic molded body formed separately in advance is set, and an upper mold manufactured in the same manner as the lower mold is fitted to the lower mold to define a product cavity containing the partial ceramic molded body, and the product cavity is A ceramic slurry is injected under pressure into the ceramic slurry, the slurry solvent is removed by suction from the ceramic slurry to solidify the ceramic, and the solidified state of the granules in the upper and lower molds is released, thereby forming a ceramic mold including a partial ceramic molded body. It is characterized by gaining a body.
なお、浸透性膜とは、ポリプロピレン、アセチルセルロ
ース、ポリスルホン酸、ポリイミド酸等の有機高分子樹
脂を膜状にしたものである。また、セラミックススラリ
ーとは、各種のセラミックス粉末に所定のバインダーお
よび水を適宜量添加し混合してスラリー状態にしたもの
である。Note that the permeable membrane is a membrane made of an organic polymer resin such as polypropylene, acetylcellulose, polysulfonic acid, or polyimide acid. Ceramic slurry is a slurry obtained by adding appropriate amounts of a predetermined binder and water to various ceramic powders and mixing them.
（実施例）
第１図〜第６図に基づき高温用ブロア翼の製造手順につ
いて説明する。図中で（１）は下型模型板で、下部に真
空ポンプ（図示せず）と連通接続する中空室（２）が形
成され、さらに表面には中空室（２）に達する細孔（３
）が複数個穿設されている。(Example) The manufacturing procedure of a high temperature blower blade will be explained based on FIGS. 1 to 6. In the figure, (1) is the lower model plate, which has a hollow chamber (2) formed at the bottom that communicates with a vacuum pump (not shown), and further has pores (3) on the surface that reach the hollow chamber (2).
) are drilled in multiple locations.
（４）は下枠で、側部に真空ポンプ（図示せず）と連通
接続する中空室（５）が形成され、さらに内面には中空
室（５）に達する細孔（６）が複数個穿設されている。(4) is a lower frame, which has a hollow chamber (5) formed on its side that communicates with a vacuum pump (not shown), and has multiple pores (6) on its inner surface that reach the hollow chamber (5). It is perforated.
（７）は上型模型板で、下部に真空ポンプ（図示せず）
と連通接続する中空室（８）が形成され、さらに表面に
は中空室（８）に達する細孔（９）が複数個穿設されて
いる。（１０）は上枠で、側部に真空ポンプ（図示せず
）と連通接続する中空室（１１）が形成され、さらに内
面には中空室（１１）に達する細孔（１２）が複数個穿
設されている。(7) is the upper model board, with a vacuum pump (not shown) at the bottom.
A hollow chamber (8) is formed which communicates with the hollow chamber (8), and a plurality of pores (9) reaching the hollow chamber (8) are bored in the surface. (10) is an upper frame, which has a hollow chamber (11) formed on its side that communicates with a vacuum pump (not shown), and has a plurality of pores (12) on its inner surface that reach the hollow chamber (11). It is perforated.
そこで、中空室（２）ヲ真空ポンプに連通して下型模型
板（１）の表面に吸引作用を働かせた状態の下に、下型
模型板（１）上に浸透性膜（■３）を被せてこれを下型
模型板（１）上に吸着させ、続いて、該下型模型板（１
）上に下枠（４）を載置する。次いで、該下枠（４）内
にセラミックス等の適宜の粒状物（１４）を充填し、続
いて、該粒状物（１４）および下枠（４）上に非通気性
で可撓性の遮蔽膜（１５）を被せて下枠（４）の上端開
口部を閉鎖する。次いで、中空室（５）ヲ真空ポンプに
連通して、浸透性膜（１３）、下枠（４）および遮蔽膜
（１５）で画成された粒状物（１４）充填の空間内を吸
引減圧する。これにより、遮蔽膜（１５）を介して粒状
物（１４）に大気圧が作用し、粒状物（１４）は固形化
せしめられる（第１図参照）。Therefore, while the hollow chamber (2) is in communication with the vacuum pump and a suction action is exerted on the surface of the lower model plate (1), a permeable membrane (■3) is placed on the lower model plate (1). and adsorbed it onto the lower model plate (1), and then the lower model plate (1)
) Place the lower frame (4) on top. Next, appropriate granules (14) such as ceramics are filled in the lower frame (4), and then a non-breathable and flexible shield is placed on the granules (14) and the lower frame (4). The upper end opening of the lower frame (4) is closed by covering the membrane (15). Next, the hollow chamber (5) is communicated with a vacuum pump to suction and reduce the pressure in the space filled with the particulate matter (14) defined by the permeable membrane (13), the lower frame (4), and the shielding membrane (15). do. As a result, atmospheric pressure acts on the particulate matter (14) through the shielding film (15), and the particulate matter (14) is solidified (see FIG. 1).
次いで、中空室（２）の真空ポンプへの連通を止めると
ともに中空室（２）に圧縮空気を供給して浸透性膜（１
３）を下型模型板（１）の表面から剥離し、続いて、固
形化した粒状物（１４）内蔵の下枠（４）を下型模型板
（１）から分離し、もって下型（１６）を製造する。次
いで、該下型（１６）を１８０度反転した後、第２図に
示すように、圧力８に〜による圧力注入によりあらかじ
め別途成形した部分セラミックス成形体（１７）と８棒
セラミックス成形体（１８）とを下型（１６）の凹み（
１９）にセットする（第３図参照）。次いで、第４図に
示すように、上述した下型（１６）と同様にして製造し
た、上枠（１０）、浸透性膜（２１）、粒状物（２２）
および遮蔽膜（２３）で構成される上型（２４）を、前
記下型（１６）上に型合せして載置し、第５図に示すよ
うに製品キャビティ（２５）を画成し、続いて、上型（
２４）に形成された鋳込口（２６）の上端部に鋳込カッ
プ（２７）をセットする。次いで、該鋳込カップ（２７
）内および製品キャビティ（２５）内にセラミックスス
ラリーを圧力１０ ｋ％で加圧注入する。Next, communication of the hollow chamber (2) to the vacuum pump is stopped and compressed air is supplied to the hollow chamber (2) to close the permeable membrane (1).
3) from the surface of the lower model plate (1), then the lower frame (4) containing the solidified granules (14) is separated from the lower model plate (1), and then the lower mold ( 16) is manufactured. Next, after inverting the lower mold (16) by 180 degrees, as shown in FIG. 2, a partial ceramic molded body (17) and an 8-bar ceramic molded body (18 ) and the recess (
19) (see Figure 3). Next, as shown in FIG. 4, an upper frame (10), a permeable membrane (21), and a granule (22) were manufactured in the same manner as the lower mold (16) described above.
and a shielding film (23) are placed on the lower mold (16) to form a product cavity (25) as shown in FIG. Next, the upper mold (
A casting cup (27) is set at the upper end of the casting opening (26) formed in 24). Next, the cast cup (27
) and the product cavity (25) at a pressure of 10 k%.
なお、セラミックススラリーは、純度９９．５％の酸化
アルミニウム粉末（昭和電工株式会社製ＡＬ−１６０５
Ｇ ） １００重量部に対して、アクリル樹脂系エマル
ジョン（中京油脂株式会社製Ｅ５１８）８重量部・ポリ
エチレングリコール２重量部・グリセリン１重量部をバ
インダとして添加するとともに、水２５重量部および解
膠剤（中京油脂株式会社製Ｄ８０５）０．３重量部を添
加し、これらをボールミルで十分に混合・解膠して得た
ものを使用した。セラミックススラリーを加圧すること
により、この中のスラリー溶媒がいわゆる浸透気化現象
により浸透性膜（１３） （２１）を通過するとともに
気化して粒状物（１４） （２２）中に至り、その後、
吸引除去される。The ceramic slurry was aluminum oxide powder with a purity of 99.5% (AL-1605 manufactured by Showa Denko Co., Ltd.).
G) To 100 parts by weight, 8 parts by weight of acrylic resin emulsion (E518 manufactured by Chukyo Yushi Co., Ltd.), 2 parts by weight of polyethylene glycol, and 1 part by weight of glycerin were added as a binder, as well as 25 parts by weight of water and a deflocculant. (D805 manufactured by Chukyo Yushi Co., Ltd.) was added, and the mixture was thoroughly mixed and peptized in a ball mill, and the resulting product was used. By pressurizing the ceramic slurry, the slurry solvent therein passes through the permeable membranes (13) (21) and vaporizes into the granules (14) (22) by a so-called pervaporation phenomenon, and then,
It is removed by suction.
この結果、セラミックススラリーは一定速度で均一に着
肉してゆき、均一の密度で固形化せしめられる。かくし
て、部分セラミックス（１７） （１７）の各基部はセ
ラミックススラリーに鋳ぐるまれて一体化される。この
ような状態で所要時間放置した後、鋳込カップ（２７）
を取り除くとともに、中空室（５）（１１）への吸引減
圧を停止して粒状物（１４） （２２）の固形化状態を
解き、続いて浸透性膜（１３） （２１）に包囲された
所望のセラミックス成形体を取り出す。As a result, the ceramic slurry is uniformly deposited at a constant speed and solidified with uniform density. In this way, each base of the partial ceramics (17) (17) is cast into the ceramic slurry and integrated. After leaving it in this condition for the required time, the cast cup (27)
At the same time, the suction vacuum to the hollow chambers (5) and (11) was stopped to release the solidified state of the particulates (14) and (22), which were then surrounded by the permeable membranes (13 and 21). A desired ceramic molded body is taken out.
このセラミックス成形体を乾燥してスラリー溶媒を完全
に除去した後、焼成すると、この焼成により浸透性膜（
１８） （２１）が焼失して第６図で図示するようなセ
ラミックス焼結体が得られた。After drying this ceramic molded body to completely remove the slurry solvent, it is fired to form a permeable film (
18) (21) was burnt out and a ceramic sintered body as shown in FIG. 6 was obtained.
（発明の効果）
以上の説明からも明らかなように本発明は、複雑形状の
セラミックス成形体の成形過程において、そのセラミッ
クス成形体の特定部分をあらかじめ成形して製品キャビ
ティにセットした後、製品キャビティにセラミックスス
ラリーを加圧注入してその部分セラミックス成形体をセ
ラミックススラリーで鋳ぐるむことによってセラミック
ス成形体の全体を成形するようにしたから、従来の成形
方法のように部分セラミックス成形体を精反高（して嵌
合組付可能にする必要はなく、成形コストが安（なる。(Effects of the Invention) As is clear from the above description, the present invention provides a method for forming a ceramic molded body with a complex shape, in which a specific portion of the ceramic molded body is pre-molded and set in the product cavity. The entire ceramic molded body is molded by injecting ceramic slurry under pressure and casting the partial ceramic molded body with the ceramic slurry. There is no need to make it possible to fit and assemble with a high cost, and the molding cost is low.
しかも、粒状物の固形化をもって成形型を製造するよう
にしたから、従来のように複数砂
個に分割された高価な石λ型を使用する場合と比較して
型コストが非常に安くなる。加えて、成形体は加圧注入
により成形されるため、成形体全体の密度がほぼ均一に
なり良質のセラミックス焼結体が得られるなどの優れた
効果を奏する。Moreover, since the mold is manufactured by solidifying the granular material, the cost of the mold is much lower than the conventional case of using an expensive stone λ mold divided into a plurality of sand pieces. In addition, since the molded body is molded by pressurized injection, the density of the entire molded body becomes almost uniform, resulting in excellent effects such as obtaining a high-quality ceramic sintered body.
図面は本発明の一実施例の手順を説明するための説明図
で、第１図は下型模型板と下型の縦断面図、第２図は部
分セラミックス成形体の斜視図、第３図は下型に部分セ
ラミックス成形体をセットした状態を示す平面図、第４
図は上型模型板と上型の縦断面図、第５図は上型と下型
とを型合せして製品キャビティを画成した状態を示す縦
断面図、第６図は製品高温用ファン翼の平面図である。
早１図
卒５ 図The drawings are explanatory drawings for explaining the procedure of an embodiment of the present invention, in which Fig. 1 is a longitudinal sectional view of the lower model plate and the lower mold, Fig. 2 is a perspective view of a partial ceramic molded body, and Fig. 3 4 is a plan view showing the partial ceramic molded body set in the lower mold.
The figure is a vertical cross-sectional view of the upper model plate and the upper mold, Figure 5 is a vertical cross-sectional view showing a state in which the upper mold and lower mold are assembled to define a product cavity, and Figure 6 is a fan for high temperature of the product. FIG. 3 is a plan view of the wing. Early 1st grade Graduation 5th grade
Claims (1)
型板上に下枠を載置し、該下枠内に粒状物を充填した後
前記下枠の上端開口部を非通気性の遮蔽膜で閉鎖し、前
記浸透性膜、下枠および遮蔽膜で画成された粒状物充填
の空間内を吸引減圧して該粒状物を固形化し、該固形化
粒状物内蔵の下枠を前記下型模型板から分離して下型を
製造し、該下型の凹み内に、加圧注入によりあらかじめ
別途成形した部分セラミックス成形体をセットし、前記
下型に、該下型と同様にして製造した上型を型合せして
部分セラミックス成形体内蔵の製品キャビティを画成し
、該製品キャビティ内にセラミックススラリーを加圧注
入し、該セラミックススラリーからスラリー溶媒を吸引
除去してセラミックスを固形化し、前記上・下型の粒状
物の固形化状態を解き、もって部分セラミックス成形体
を含むセラミックス成形体を得ることを特徴とするセラ
ミックス成形体の成形方法。After adsorbing the permeable membrane to the surface of the lower model plate, a lower frame is placed on the lower model plate, and after filling the particulate matter into the lower frame, the upper end opening of the lower frame is closed. The space defined by the permeable membrane, the lower frame and the shielding membrane, which is filled with particulate matter, is vacuumed and depressurized to solidify the particulate matter, and the particulate matter is solidified under the solidified particulate matter. A lower mold is manufactured by separating the frame from the lower mold model plate, a partial ceramic molded body that has been separately molded in advance by pressure injection is set in the recess of the lower mold, and the lower mold and the lower mold are placed in the lower mold. The upper molds manufactured in the same manner are molded together to define a product cavity containing a partial ceramic molded body, a ceramic slurry is injected under pressure into the product cavity, and the slurry solvent is removed by suction from the ceramic slurry to form a ceramic product. A method for molding a ceramic molded body, comprising: solidifying the granules in the upper and lower molds, and releasing the solidified state of the granules in the upper and lower molds, thereby obtaining a ceramic molded body including a partial ceramic molded body.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63072551A JP2547065B2 (en) | 1988-03-26 | 1988-03-26 | Molding method for ceramic molded body |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63072551A JP2547065B2 (en) | 1988-03-26 | 1988-03-26 | Molding method for ceramic molded body |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH01244806A true JPH01244806A (en) | 1989-09-29 |
| JP2547065B2 JP2547065B2 (en) | 1996-10-23 |
Family
ID=13492607
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP63072551A Expired - Fee Related JP2547065B2 (en) | 1988-03-26 | 1988-03-26 | Molding method for ceramic molded body |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2547065B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1997007948A1 (en) * | 1995-08-26 | 1997-03-06 | Toto Ltd. | Method of slip casting of powders, casting mold used in said method, and process for producing open-cell porous body used in said mold |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS59140813U (en) * | 1983-03-11 | 1984-09-20 | 日本模型株式会社 | model molding set |
| JPS62268603A (en) * | 1986-05-16 | 1987-11-21 | 新東工業株式会社 | Method of molding prottype body for sintering |
-
1988
- 1988-03-26 JP JP63072551A patent/JP2547065B2/en not_active Expired - Fee Related
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS59140813U (en) * | 1983-03-11 | 1984-09-20 | 日本模型株式会社 | model molding set |
| JPS62268603A (en) * | 1986-05-16 | 1987-11-21 | 新東工業株式会社 | Method of molding prottype body for sintering |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1997007948A1 (en) * | 1995-08-26 | 1997-03-06 | Toto Ltd. | Method of slip casting of powders, casting mold used in said method, and process for producing open-cell porous body used in said mold |
| US6165398A (en) * | 1995-08-26 | 2000-12-26 | Toto Ltd. | Method of slip casting powdery material, using a water resistant mold with self-water absorbent ability |
| US6866803B1 (en) | 1995-08-26 | 2005-03-15 | Toto Ltd. | Mold for use in slip casting method, and method of manufacturing open porous body for use in mold |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2547065B2 (en) | 1996-10-23 |
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