JPS6330202A - Manufacture of ceramics baked body - Google Patents

Manufacture of ceramics baked body

Info

Publication number
JPS6330202A
JPS6330202A JP17270586A JP17270586A JPS6330202A JP S6330202 A JPS6330202 A JP S6330202A JP 17270586 A JP17270586 A JP 17270586A JP 17270586 A JP17270586 A JP 17270586A JP S6330202 A JPS6330202 A JP S6330202A
Authority
JP
Japan
Prior art keywords
mold
fired
ceramic
slurry
weight
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
Application number
JP17270586A
Other languages
Japanese (ja)
Inventor
修二 小野
博一 山本
英雄 角田
光 本村
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Mitsubishi Heavy Industries Ltd
Original Assignee
Mitsubishi Heavy Industries Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Mitsubishi Heavy Industries Ltd filed Critical Mitsubishi Heavy Industries Ltd
Priority to JP17270586A priority Critical patent/JPS6330202A/en
Publication of JPS6330202A publication Critical patent/JPS6330202A/en
Pending legal-status Critical Current

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Abstract

(57)【要約】本公報は電子出願前の出願データであるた
め要約のデータは記録されません。
(57) [Abstract] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

【発明の詳細な説明】 〔産業上の利用分野〕 本発明は、アルミナ、ジルコニア、窒化珪素、炭化珪素
、サイアロン等のセラミックスの泥漿鋳込成形法による
セラミックス焼成体の製造方法に関する。
DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a method for manufacturing ceramic fired bodies of ceramics such as alumina, zirconia, silicon nitride, silicon carbide, sialon, etc. by a slurry casting method.

〔従来の技術〕[Conventional technology]

従来、セラきツクスの泥漿鋳込成形に用いられている鋳
型は石膏型の場合が多い。半水石膏100重量部に対し
て水を60〜100重量部加えて流し込み所定の形状の
鋳型を得る。石膏型は5.寸法精度が良く、吸水性があ
るため、分散媒に解膠剤や結合剤を加えてスラリー化し
たセラミックス泥漿を流し込めば、水分は、石膏に吸収
され、寸法精度の高いセラミックス成形体が石膏型内に
残る。この後、この成形体を石膏型から取り外し乾燥の
工程を経て、所定の雰囲気、温度で焼成する。
Conventionally, the molds used for slurry casting of serachics are often plaster molds. 60 to 100 parts by weight of water is added to 100 parts by weight of gypsum hemihydrate and poured to obtain a mold of a predetermined shape. The plaster mold is 5. Because it has good dimensional accuracy and water absorption, when ceramic slurry made by adding deflocculant and binder to the dispersion medium is poured, the water will be absorbed by the plaster, and the ceramic molded body with high dimensional accuracy will be made into plaster. remains in the mold. Thereafter, the molded body is removed from the plaster mold, undergoes a drying process, and is fired in a predetermined atmosphere and temperature.

以上のような方法で石膏型を利用した泥漿鋳込が実施さ
れているが、この方法では以下の欠点がある。
Although slurry casting using a plaster mold has been carried out using the method described above, this method has the following drawbacks.

(1)  石膏型は、加熱によって膨張し亀裂を生じや
すい。従って石膏型内に残したままセラミックスを乾燥
や焼成することができない。この欠点は特に複雑形状の
製品を作る際、例えはセラミックスを脱型できない中子
としては使用できないことにつながる。
(1) Gypsum molds tend to expand and crack when heated. Therefore, the ceramic cannot be dried or fired while remaining in the plaster mold. This drawback leads to the inability to use ceramics as cores that cannot be demolded, especially when making products with complex shapes.

(2)石膏型は、石膏を流し込み硬化させ、その後乾燥
して、使用できる状態になる。特に、乾燥後の水分量を
一定にしておかないと、その時点で割れを生じたり、鋳
込んだセラミックス泥漿からの吸水が不安定になり一定
の製品を作れない。従って、量産プロセスとしては適し
ていない。
(2) Plaster molds are ready for use by pouring plaster into them and letting them harden, then drying them. In particular, if the amount of moisture after drying is not kept constant, cracks may occur at that point, and the water absorption from the cast ceramic slurry will become unstable, making it impossible to produce a consistent product. Therefore, it is not suitable as a mass production process.

〔発明が解決しようとする問題点〕[Problem that the invention seeks to solve]

本発明は、石膏型を利用した泥漿鋳込成形法による上記
の欠点を解消することを目的とするものである。
The present invention aims to eliminate the above-mentioned drawbacks caused by the slurry casting method using a plaster mold.

〔問題点を解決するための手段〕[Means for solving problems]

本発明は、セラミックス泥漿を鋳型に流し込み、脱水固
化した後、乾燥、焼成するセラミックス焼成体の製造方
法において、砂粒を骨材とし、これに1種もしくは2種
以上の熱硬化性液状粘結剤と、酸とを加え混練した後所
望の形状に成形硬化させて鋳型とし、該鋳型に溶媒、解
膠剤、粘結剤などを加えてスラリー化したセラミックス
泥漿を流し込み、脱水固化させた後、鋳型内に収容した
ままで乾燥、焼成することを特徴とするセラミックス焼
成体の製造方法である。
The present invention provides a method for producing a fired ceramic body in which ceramic slurry is poured into a mold, dehydrated and solidified, then dried and fired, in which sand grains are used as aggregate, and one or more thermosetting liquid binders are added to the aggregate. After adding and kneading with acid, it is molded and hardened into a desired shape to form a mold, and a ceramic slurry made into a slurry by adding a solvent, a deflocculant, a caking agent, etc. is poured into the mold, and after dehydration and solidification, This is a method for producing a fired ceramic body, which is characterized by drying and firing the fired ceramic body while it is housed in a mold.

以下、本発明の詳細な説明する。The present invention will be explained in detail below.

本発明は、砂粒を骨材とした鋳型を用いることが大きな
特徴である。鋳型の構成の1例を次に示す。砂粒の種類
としては、珪砂、アルミナ、ジルコン、クロマイトなど
を1種もしくは2種以上組合せて使用する。砂の粒度は
、JI85号や4号等の粗い砂も使用できるが、吸水率
が太きすぎて亀裂を生じやすい点及び表面粗度が低下す
る等の理由から好ましくなく、望ましくは5号以上の細
かいものが良い。
A major feature of the present invention is that it uses a mold using sand grains as aggregate. An example of the structure of the mold is shown below. As for the types of sand grains, silica sand, alumina, zircon, chromite, etc. are used alone or in combination of two or more types. As for the grain size of the sand, coarse sand such as JI No. 85 or No. 4 can also be used, but it is not preferable because the water absorption rate is too large and tends to cause cracks, and the surface roughness decreases. The finer details are better.

本発明では、砂粒を結合する熱硬化性液状粘結剤として
、有機系縮合タイプであるフェノール樹脂、尿素フェノ
ール樹脂、フェノール・7ラン樹脂及びウレタン樹脂を
1種もしくは2種以上組合せて使用する。ポリエチレン
を初めとする熱可塑性樹脂は分解温度が低く、セラミッ
クス鋳込後、乾燥及び焼成の過程で強度を保持できない
。また、水ガラス等の無機系のものは、高温でも強度を
もつため、セラミックス焼成の過程で本こわれず、製品
が割れ易くなる。
In the present invention, one type or a combination of two or more of organic condensation type phenol resins, urea phenol resins, phenol-7 run resins, and urethane resins are used as thermosetting liquid binders for bonding sand grains. Thermoplastic resins such as polyethylene have a low decomposition temperature and cannot maintain their strength during the drying and firing process after ceramic casting. Furthermore, since inorganic materials such as water glass have strength even at high temperatures, they do not break during the ceramic firing process, making the product more likely to break.

本発明での熱硬化性液状粘結剤の添加量は、砂粒の種類
や粒度等によシ異なるため特定できないが、砂粒ず00
重量部に対し0.5〜5重量部が望ましい。0.5重量
部未満では安定した強度のものが比較的に得られにくく
、5重量部を超えると粘結剤分解時のガス発生量が大き
く亀裂を生じやすい。
The amount of thermosetting liquid binder added in the present invention cannot be specified because it varies depending on the type and particle size of the sand grains, but
The amount is preferably 0.5 to 5 parts by weight. If it is less than 0.5 parts by weight, it is relatively difficult to obtain stable strength, and if it exceeds 5 parts by weight, the amount of gas generated during decomposition of the binder is large and cracks are likely to occur.

本発明では、粘結剤を硬化させる触媒として酸を用いる
。酸としてはリン酸、硫酸などの無機酸もしくはパラト
ルエン・スルホン酸、キシレン・スルホン酸などの有機
峻を1′Nもしくは2種以上組合せて用いる。添加量は
、粘結剤100重量部に対し、50〜60重量部程度が
望ましい。30重量部未満では粘結剤が十分に硬化せず
、60重量部を超えると、混線中に硬化が進み可使時間
が短くなる。
In the present invention, an acid is used as a catalyst for curing the binder. As the acid, an inorganic acid such as phosphoric acid or sulfuric acid or an organic acid such as para-toluene sulfonic acid or xylene sulfonic acid is used in 1'N or a combination of two or more. The amount added is preferably about 50 to 60 parts by weight per 100 parts by weight of the binder. If the amount is less than 30 parts by weight, the binder will not be sufficiently cured, and if it exceeds 60 parts by weight, curing will proceed during cross-wiring and the pot life will be shortened.

本発明では、これらの材料を混練した後、所定の形状に
成形する。成形に当っては、木型や金型等の繰り返し可
能な模型を用いるか、もしくは発泡ポリスチレン等の消
失性の模型を用いて造型する。木型や金型の場合は硬化
後離型し消失性模型の場合は、内部の模型を消失させて
鋳型とする。また鋳型の表面には、必要に応じて、表面
粗度を上げるため、砂粒より細かい耐火物粉末を膏剤と
する塗料を施こす場合もある。
In the present invention, these materials are kneaded and then molded into a predetermined shape. For molding, a repeatable model such as a wooden mold or a metal mold is used, or a fugitive model such as expanded polystyrene is used. In the case of a wooden mold or metal mold, the mold is released after hardening, and in the case of a fugitive model, the internal model is made to disappear to form a casting mold. Furthermore, in order to increase the surface roughness, the surface of the mold may be coated with a paint containing a refractory powder finer than a grain of sand, if necessary.

このようにして成形した鋳型に、別途、準備したスリッ
プ・キャスティング用のセラミックス・スラリーを流し
込む。スラリー中の水分は徐々に鋳型側へ移行し、流動
性を失い固形物が鋳型内へ残る。
A separately prepared ceramic slurry for slip casting is poured into the mold thus formed. The water in the slurry gradually moves toward the mold, losing fluidity and leaving solids in the mold.

石膏型を用いる通常の方法では、この後、セラミックス
固形物を脱型し、乾燥、焼成を行なうが、本発明では鋳
型内に残したまま乾燥、焼成を行なう。即ちセラミック
ス固形物を残したままの鋳型を昇温すると、粘結剤は、
600〜800C程度で解し、砂粒に対する結合力を失
ないセラミックス固形物が鋳型から外れるよう罠なる。
In a normal method using a plaster mold, the ceramic solid is then removed from the mold, dried, and fired, but in the present invention, it is dried and fired while remaining in the mold. In other words, when the temperature of the mold is raised with the ceramic solids remaining, the binder is
It melts at about 600 to 800 C and becomes a trap so that the ceramic solids that do not lose their binding strength to the sand grains are released from the mold.

この後、そのまま焼成しても良いが、珪砂やジルコン、
クロマイト等は、軟化や溶融等を起こしセラミックスに
付着しやすいため取シ外した方が望ましい。ま友、溶融
アルミナを膏剤とした鋳型では、溶融や軟化は起きない
ため、そのまま焼成しても良い。
After this, you can fire it as is, but you can use silica sand, zircon, etc.
Chromite and the like tend to soften or melt and adhere to ceramics, so it is preferable to remove them. Friend, a mold made of fused alumina will not melt or soften, so it can be fired as is.

実施例1 第1図は本発明の一実施例を示す縦断側面図である。鋳
型1ヘセラミツクス・スラリー2を流し込んだ直後の状
態を示すものである。鋳型1の構成材料は、以下の通り
とした。
Embodiment 1 FIG. 1 is a longitudinal sectional side view showing an embodiment of the present invention. This figure shows the state immediately after pouring the ceramic slurry 2 into the mold 1. The constituent materials of the mold 1 were as follows.

骨材:溶融アルミナ     100重量部(220メ
ツシ、:L) 粘結剤:フェノール・7ラン樹脂      2重量部
酸  :パラトルエン・スルホンW1    1重量部
セラミックス・スラリー2を流し込む鋳型1の空洞部は
、ポリスチレン模型を用いた。枠内にポリスチレン模型
をセットし友後、前記鋳型材料を充填し、固化した後、
加熱して消失させて空洞とした。
Aggregate: 100 parts by weight of fused alumina (220 mesh, :L) Binder: 2 parts by weight of phenol/7 run resin Acid: 1 part by weight of paratoluene/sulfone W1 The cavity of the mold 1 into which the ceramic slurry 2 is poured is: A polystyrene model was used. After setting the polystyrene model in the frame and filling it with the mold material and solidifying it,
It was heated to disappear and form a cavity.

この後、アルミナ100重量部、2%ポリビニールアル
コール水溶液60重量部からなるセラミックス・スラリ
ーを型内に流し込んだ。
Thereafter, a ceramic slurry consisting of 100 parts by weight of alumina and 60 parts by weight of a 2% polyvinyl alcohol aqueous solution was poured into the mold.

セラミックス・スラリー中の水が鋳型内へ吸収され固化
した後、乾燥工程を経て+6ooC。
After the water in the ceramic slurry is absorbed into the mold and solidified, it goes through a drying process to +6ooC.

2時間の条件で焼成した。焼成後鋳型は崩壊し、焼成さ
れたアルミナが炉内に残った。    ゛実施例2〜6 第1表に示す構成材料によう、実施例1と同一の方法で
製作した各鋳型を用いて、実施例1と同一の方法でセラ
ミックス焼成体を製造した。
It was fired for 2 hours. After firing, the mold collapsed and the fired alumina remained in the furnace. Examples 2 to 6 Ceramic fired bodies were manufactured in the same manner as in Example 1 using the constituent materials shown in Table 1 and using molds manufactured in the same manner as in Example 1.

〔発明の効果〕〔Effect of the invention〕

上述したように本発明によれば、つぎのような効果があ
る。
As described above, the present invention has the following effects.

+I+  鋳型内に鋳込んだセラミックス・スラリーを
固化後、脱型する必要がないため複雑形状の製品を容易
に得ることができる。
+I+ Since there is no need to remove the ceramic slurry from the mold after solidifying it, products with complex shapes can be easily obtained.

(21石膏型と異なり、骨材の再生利用が可能でちゃ、
低コストの製品を得ることができる。
(Unlike 21 plaster mold, it is possible to recycle the aggregate,
Low cost products can be obtained.

【図面の簡単な説明】[Brief explanation of drawings]

第1図は、本発明の一実施例を示すセラミックス・スラ
リー鋳込後の鋳型の縦断側面図である。 1・・・鋳型、2・・・セラミックス・スラリー復代理
人 内 1)  明 復代理人 萩 原 亮 − 復代理人 安 西 篤 夫
FIG. 1 is a longitudinal sectional side view of a mold after ceramic slurry is poured, showing an embodiment of the present invention. 1...Mold, 2...Ceramics/slurry sub-agent 1) Meifuku agent Ryo Hagiwara - sub-agent Atsuo Anzai

Claims (1)

【特許請求の範囲】 セラミックス泥漿を鋳型に流し込み、脱水 固化した後、乾燥、焼成するセラミックス焼成体の製造
方法において、砂粒を骨材とし、これに1種もしくは2
種以上の熱硬化性液状粘結剤と、酸とを加え混練した後
所望の形状に成形硬化させて鋳型とし、該鋳型に溶媒、
解膠剤、粘結剤などを加えてスラリー化したセラミック
ス泥漿を流し込み、脱水固化させた後、鋳型内に収容し
たままで乾燥、焼成することを特徴とするセラミックス
焼成体の製造方法。
[Claims] A method for producing a fired ceramic body in which ceramic slurry is poured into a mold, dehydrated and solidified, then dried and fired, wherein sand grains are used as aggregate, and one or two types of
A thermosetting liquid binder and an acid are added and kneaded, then molded and hardened into a desired shape to form a mold, and the mold is filled with a solvent,
A method for manufacturing a fired ceramic body, which comprises pouring ceramic slurry made into a slurry by adding a deflocculant, a caking agent, etc., dehydrating it and solidifying it, and then drying and firing it while remaining in a mold.
JP17270586A 1986-07-24 1986-07-24 Manufacture of ceramics baked body Pending JPS6330202A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP17270586A JPS6330202A (en) 1986-07-24 1986-07-24 Manufacture of ceramics baked body

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP17270586A JPS6330202A (en) 1986-07-24 1986-07-24 Manufacture of ceramics baked body

Publications (1)

Publication Number Publication Date
JPS6330202A true JPS6330202A (en) 1988-02-08

Family

ID=15946813

Family Applications (1)

Application Number Title Priority Date Filing Date
JP17270586A Pending JPS6330202A (en) 1986-07-24 1986-07-24 Manufacture of ceramics baked body

Country Status (1)

Country Link
JP (1) JPS6330202A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5132072A (en) * 1991-01-29 1992-07-21 Kyocera Corporation Molding method of ceramic body
JP2007223137A (en) * 2006-02-23 2007-09-06 National Institute Of Advanced Industrial & Technology Casting mold for microwave heating and method for producing ceramic sintered body
US20100092657A1 (en) * 2007-07-27 2010-04-15 Ngk Insulators, Ltd. Ceramic compact, ceramic part, method for producing ceramic compact, and method for producing ceramic part

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5132072A (en) * 1991-01-29 1992-07-21 Kyocera Corporation Molding method of ceramic body
JP2007223137A (en) * 2006-02-23 2007-09-06 National Institute Of Advanced Industrial & Technology Casting mold for microwave heating and method for producing ceramic sintered body
US20100092657A1 (en) * 2007-07-27 2010-04-15 Ngk Insulators, Ltd. Ceramic compact, ceramic part, method for producing ceramic compact, and method for producing ceramic part
US8409484B2 (en) * 2007-07-27 2013-04-02 Ngk Insulators, Ltd. Method for producing a ceramic compact

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