JPH01150430A - Production of ceramic core - Google Patents
Production of ceramic coreInfo
- Publication number
- JPH01150430A JPH01150430A JP30871987A JP30871987A JPH01150430A JP H01150430 A JPH01150430 A JP H01150430A JP 30871987 A JP30871987 A JP 30871987A JP 30871987 A JP30871987 A JP 30871987A JP H01150430 A JPH01150430 A JP H01150430A
- Authority
- JP
- Japan
- Prior art keywords
- slurry
- ethyl silicate
- emulsion
- ceramic core
- mold
- 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
- 239000000919 ceramic Substances 0.000 title claims abstract description 18
- 238000004519 manufacturing process Methods 0.000 title claims description 10
- BOTDANWDWHJENH-UHFFFAOYSA-N Tetraethyl orthosilicate Chemical compound CCO[Si](OCC)(OCC)OCC BOTDANWDWHJENH-UHFFFAOYSA-N 0.000 claims abstract description 29
- 239000002002 slurry Substances 0.000 claims abstract description 26
- 239000000839 emulsion Substances 0.000 claims abstract description 15
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 11
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 7
- 238000007711 solidification Methods 0.000 abstract description 7
- 230000008023 solidification Effects 0.000 abstract description 7
- 239000003995 emulsifying agent Substances 0.000 abstract description 6
- 239000000203 mixture Substances 0.000 abstract description 3
- 238000005266 casting Methods 0.000 abstract description 2
- 238000000465 moulding Methods 0.000 abstract description 2
- 238000005245 sintering Methods 0.000 abstract 2
- 230000008602 contraction Effects 0.000 abstract 1
- 238000005336 cracking Methods 0.000 abstract 1
- 238000010304 firing Methods 0.000 description 6
- 239000007788 liquid Substances 0.000 description 6
- 239000000843 powder Substances 0.000 description 6
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 239000011347 resin Substances 0.000 description 3
- 229920005989 resin Polymers 0.000 description 3
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 2
- 239000011230 binding agent Substances 0.000 description 2
- 230000014759 maintenance of location Effects 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 239000011505 plaster Substances 0.000 description 2
- 235000019353 potassium silicate Nutrition 0.000 description 2
- 239000000377 silicon dioxide Substances 0.000 description 2
- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical compound [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 description 2
- DBMJMQXJHONAFJ-UHFFFAOYSA-M Sodium laurylsulphate Chemical compound [Na+].CCCCCCCCCCCCOS([O-])(=O)=O DBMJMQXJHONAFJ-UHFFFAOYSA-M 0.000 description 1
- 239000007864 aqueous solution Substances 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 230000003111 delayed effect Effects 0.000 description 1
- 235000014113 dietary fatty acids Nutrition 0.000 description 1
- 230000001804 emulsifying effect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 125000001495 ethyl group Chemical group [H]C([H])([H])C([H])([H])* 0.000 description 1
- 239000000194 fatty acid Substances 0.000 description 1
- 229930195729 fatty acid Natural products 0.000 description 1
- -1 fatty acid ester Chemical class 0.000 description 1
- 238000001879 gelation Methods 0.000 description 1
- 238000007429 general method Methods 0.000 description 1
- 239000002736 nonionic surfactant Substances 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 238000007582 slurry-cast process Methods 0.000 description 1
- 235000019333 sodium laurylsulphate Nutrition 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
- 239000004094 surface-active agent Substances 0.000 description 1
- 229910052845 zircon Inorganic materials 0.000 description 1
- GFQYVLUOOAAOGM-UHFFFAOYSA-N zirconium(iv) silicate Chemical compound [Zr+4].[O-][Si]([O-])([O-])[O-] GFQYVLUOOAAOGM-UHFFFAOYSA-N 0.000 description 1
Landscapes
- Molds, Cores, And Manufacturing Methods Thereof (AREA)
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は鋳造品を製造する際に用いられるセラミックス
中子の製造方法に関する。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method for manufacturing a ceramic core used in manufacturing a cast product.
セラミックス中子全製造する場合、シリカ粉末等の骨材
にエチルシリケートをバインダーとして添加してスラリ
ー全作り、これに硬化剤を添加し、すばやくスラリー全
作型に流し込み、木型内で固化させてから抜型後焼成し
、セラミックス中子全得るのが従来の一般的方法である
。When producing a complete ceramic core, the entire slurry is made by adding ethyl silicate as a binder to aggregate such as silica powder, a hardening agent is added to this, the entire slurry is quickly poured into a mold, and the slurry is solidified within the wooden mold. The conventional general method is to obtain a complete ceramic core by cutting the mold out of the mold and then firing it.
シリカ粉末、アルミナ粉末、ジルコン粉末等セラミック
ス粉末を骨材として、これにエチルシリケートをバイン
ダーとして添加、混合してスラリー状とし、さらに水ガ
ラス、ＭｇＯ等アルカリ系硬化剤を添加、混合し、この
スラリー全作型内に流し込んで固化させ、抜型後焼成す
ることによりセラミックス中子を製造する場合、硬化剤
の添加後スラリーはエチルシリケートのゲル化により刻
々と短時間内に流動性が悪化するｔめ、鋳込作業性が悪
く均質な成形体を得ることが困難であった。又、流動性
を確保する之めエチルシリケートの量を骨材に対して過
剰に添加せねばならず液体分の収縮が大きくなり、固化
時あるいは焼成時にクランクが発生するという不具合を
生じる場合があつ友。Ceramic powder such as silica powder, alumina powder, and zircon powder is used as an aggregate, and ethyl silicate is added as a binder and mixed to form a slurry. Furthermore, an alkaline hardening agent such as water glass and MgO is added and mixed to form a slurry. When manufacturing a ceramic core by pouring it into a mold, solidifying it, and firing it after removal from the mold, the fluidity of the slurry after adding a hardening agent deteriorates rapidly in a short period of time due to gelation of ethyl silicate. However, it was difficult to obtain a homogeneous molded product due to poor casting workability. In addition, in order to ensure fluidity, an excessive amount of ethyl silicate must be added to the aggregate, which increases the shrinkage of the liquid content, which may cause problems such as cranking during solidification or firing. friend.
本発明は上記技術水準に鑑み、セラミックス中子の製造
時のスラリーの固化反応を制御し流動性保持時間を向上
させ、液体分の減少により均質でクラックの発生のない
セラミックス中子の製造方法を提供しようとするもので
ある。In view of the above-mentioned state of the art, the present invention provides a method for producing ceramic cores that is homogeneous and free from cracks by controlling the solidification reaction of slurry during the production of ceramic cores, improving fluidity retention time, and reducing the liquid content. This is what we are trying to provide.
すなわち本発明は骨材、一定温度でエチルシリケートと
水に可逆的に変化するＯ ／ Ｗ型エチルシリケートエ
マルジョン及び硬化剤を混合し友スラＩＪ−に型枠で成
形固化しｔ後、焼成することに％徴とするセラミックス
中子の製造方法である。That is, the present invention involves mixing aggregate, an O/W type ethyl silicate emulsion that reversibly changes into ethyl silicate and water at a certain temperature, and a hardening agent, molding the mixture into a mold to solidify it in a mold, and then firing it. This is a method for manufacturing ceramic cores with a % characteristic.
本発明で使用される一定温度でエチルシリケートと水に
可逆的に変化するＯ／Ｗ型エチエチルシリケートエマル
ジョンエチルシリケートニ乳化剤及び水を加えて攪拌混
合することによって得られる。この際、使用する乳化剤
としてはエチルシリケートの表面張力（極性）と同じ程
度の液体に対して乳化作用を有するものならば単独でも
併用でも使用可能であり、特にノニオン系界面活性が好
ましい。またアクリルアニオン系乳化剤はエチルシリケ
ートを分解しないようにエチルシリケート全つ＼み込む
作用をするのでこのものも使用するに適する乳化剤であ
る。The O/W type ethyl silicate emulsion that reversibly changes into ethyl silicate and water at a constant temperature used in the present invention is obtained by adding an ethyl silicate emulsifier and water and stirring and mixing. In this case, the emulsifier used can be used alone or in combination as long as it has an emulsifying effect on liquids with the same level of surface tension (polarity) as ethyl silicate, and nonionic surfactants are particularly preferred. Acrylic anionic emulsifiers are also suitable emulsifiers because they act to absorb all of the ethyl silicate so as not to decompose it.
０ ／ Ｗ Ｗエチルシリケートエマルジョンを、エチ
ルシリケートと水に変化させる温度は、使用する乳化剤
の選定によってなされる。The temperature at which the 0/WW ethylsilicate emulsion is converted into ethylsilicate and water is determined by the selection of the emulsifier used.
このよりなＯ／ Ｗ型エチルシリケート及び硬化剤を骨
材に配合したスラリーは、一定温度以下ではＯ／Ｗ型エ
チエチルシリケート定に存在している九め、エチルシリ
ケートのゲル化による固化反応は大幅に時間全遅延させ
ることができ、スラリーを木型（樹脂型、石膏型、金型
）内に流し込む際の流動性を保持し、均質な成形体が得
られる。又、このエチルシリケートエマルジョンはある
温度以上に昇温した時、はじめて破壊し硬化剤と反応す
る状態となる。し九がってスラリーヲ鋳込んだ木型（樹
脂型、石膏型、金型）を恒温室に入れ、一定温度に達し
た時点で、急速に固化反応が進み強固なセラミックス中
子が形成され、これはすぐに抜型可能である。In the slurry in which O/W type ethyl silicate and curing agent are blended into aggregate, O/W type ethyl silicate is present at a constant temperature below a certain temperature. It is possible to significantly delay the total time, maintain fluidity when pouring the slurry into a wooden mold (resin mold, plaster mold, metal mold), and obtain a homogeneous molded product. Moreover, this ethyl silicate emulsion breaks down and becomes ready to react with the curing agent only when the temperature rises above a certain temperature. Then, the wooden mold (resin mold, plaster mold, metal mold) into which the slurry was cast is placed in a thermostatic chamber, and when it reaches a certain temperature, the solidification reaction rapidly progresses and a strong ceramic core is formed. This can be immediately demolded.
（１１エチルシリケートエマルジョン’を一定温度以上
では安定なＯ／Ｗ型エマルジョンの状態にあるようにし
ておくことにより、エチルシリケートと硬化剤の反応を
遅らせ、スラリーの可使時間を長くすることができ、ス
ラリーの鋳込作業性を向上させ均質なセラミックス中子
１［造させることができる。(By keeping the 11 ethyl silicate emulsion in a stable O/W type emulsion above a certain temperature, the reaction between the ethyl silicate and the curing agent can be delayed and the usable life of the slurry can be extended. , it is possible to improve the workability of slurry casting and to produce a homogeneous ceramic core 1.
（２） 木型へ流し込んだスラリーは一定温度以上に
昇温することにより、エチルシＩ）ケ−）エマルジョン
が破壊され、硬化剤と反応、急速に固化し、セラミック
ス中子速成形体を得ることができる。(2) When the slurry poured into the wooden mold is heated to a certain temperature or higher, the ethyl resin emulsion is destroyed, reacts with the hardening agent, and rapidly solidifies, making it possible to obtain a ceramic core molded body. can.
（３） スラリーの固化反応を遅延することにより少
ない液体分で十分な流動性を付与させることができ、固
化時及び焼成時の液体分の収縮による割れの発生全防止
できる。(3) By delaying the solidification reaction of the slurry, sufficient fluidity can be imparted with a small liquid content, and cracks due to shrinkage of the liquid content during solidification and firing can be completely prevented.
エチルシリケート４０（有効５ｉｎ２ 含有量４０％
のポリ珪酸−エステル）に、アクリルアニオン系の乳剤
〔亜細亜工業（株）製、商品名２８５００１及び界面活
性剤として、ポリグリセリン脂肪酸エステル（デカグリ
セリルヘプタオレエート）〔日光ケミカルズ（株）製、
商品名；デカボリン（Ｄｅｃａｇｏｌｙｎ） ７−０
］、ラウリル硫酸ナトリウム及び水を表１の割合で攪拌
、混合しエチルシリケートを乳化しエチルシリケートエ
マルジョンを得る。Ethyl silicate 40 (effective 5in2 content 40%)
polysilicate-ester), an acrylic anionic emulsion [manufactured by Asia Kogyo Co., Ltd., trade name 285001] and as a surfactant, polyglycerin fatty acid ester (decaglyceryl heptaoleate) [manufactured by Nikko Chemicals Co., Ltd.,
Product name: Decagolyn 7-0
], sodium lauryl sulfate, and water are stirred and mixed in the proportions shown in Table 1 to emulsify ethyl silicate to obtain an ethyl silicate emulsion.
表 １ エチルシリケートエマルジョ７ｍ成例上記
方法により製作したエチルシリケートエマルジョンに骨
材として平均粒径７μｍ のアルミナ粉末及びモル比２
．３の水ガラス５０％水溶液を表２の割合で混合しスラ
リー全得る。Table 1 Example of ethyl silicate emulsion 7m production Ethyl silicate emulsion produced by the above method and alumina powder with an average particle size of 7 μm as aggregate and a molar ratio of 2
．． A 50% aqueous solution of water glass in Step 3 was mixed in the proportions shown in Table 2 to obtain a slurry.
表 ２ スラリー組成例
上記方法により得られたスラリーを中子装作用の木型内
に流し込み、これを恒温室に入れ、約６０Ｃ以上に加熱
することによりスラリーを固化させる。その後木型より
中子を抜型し、焼成炉にて約＋ｏｏｏＣで１時間加熱焼
成することにより有機成分を除去しセラミックス中子を
得る。Table 2 Example of Slurry Composition The slurry obtained by the above method is poured into a wooden mold for core mounting, placed in a thermostatic chamber, and heated to about 60C or higher to solidify the slurry. Thereafter, the core is cut out from the wooden mold and fired in a firing furnace at approximately +oooC for 1 hour to remove organic components and obtain a ceramic core.
なお、上記衣１、表２の割合は実施例における最適値を
示したものであって同表右側０内に示す範囲であれば同
様の効果をあげ得ることを確認している。Note that the ratios in Clothing 1 and Table 2 above indicate the optimum values in the examples, and it has been confirmed that similar effects can be achieved if the ratios are within the range 0 on the right side of the table.
本発明により、セラミックス中子製造時のスラリーの固
化反応を制御することにより、スラリーの流動性保持時
間の向上、液体分量の減少により均質で、クランク発生
のないセラミックス中子の製造が可能となる。According to the present invention, by controlling the solidification reaction of the slurry during the production of ceramic cores, it is possible to improve the fluidity retention time of the slurry and reduce the amount of liquid, thereby making it possible to produce homogeneous ceramic cores without the occurrence of cracks. .
Claims (1)
するＯ／Ｗ型エチルシリケートエマルジョン及び硬化剤
を混合したスラリーを型枠で成形固化した後、焼成する
ことを特徴とするセラミックス中子の製造方法。A ceramic core characterized in that a slurry containing aggregate, an O/W type ethyl silicate emulsion that reversibly changes into ethyl silicate and water at a certain temperature, and a hardening agent is molded and solidified in a mold, and then fired. Production method.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP30871987A JPH01150430A (en) | 1987-12-08 | 1987-12-08 | Production of ceramic core |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP30871987A JPH01150430A (en) | 1987-12-08 | 1987-12-08 | Production of ceramic core |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH01150430A true JPH01150430A (en) | 1989-06-13 |
Family
ID=17984457
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP30871987A Pending JPH01150430A (en) | 1987-12-08 | 1987-12-08 | Production of ceramic core |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH01150430A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109926433A (en) * | 2019-03-29 | 2019-06-25 | 赵力争 | A kind of solid waste environment-friendly type film forming curing agent and its application method |
-
1987
- 1987-12-08 JP JP30871987A patent/JPH01150430A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109926433A (en) * | 2019-03-29 | 2019-06-25 | 赵力争 | A kind of solid waste environment-friendly type film forming curing agent and its application method |
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