JPH0446721B2 - - Google Patents
Info
- Publication number
- JPH0446721B2 JPH0446721B2 JP13043889A JP13043889A JPH0446721B2 JP H0446721 B2 JPH0446721 B2 JP H0446721B2 JP 13043889 A JP13043889 A JP 13043889A JP 13043889 A JP13043889 A JP 13043889A JP H0446721 B2 JPH0446721 B2 JP H0446721B2
- Authority
- JP
- Japan
- Prior art keywords
- slurry
- plaster mold
- water
- casting
- oxide ceramic
- 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
Links
- 239000011505 plaster Substances 0.000 claims description 48
- 239000002002 slurry Substances 0.000 claims description 46
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 33
- 238000005266 casting Methods 0.000 claims description 28
- 229910052575 non-oxide ceramic Inorganic materials 0.000 claims description 21
- 239000011225 non-oxide ceramic Substances 0.000 claims description 21
- 238000000034 method Methods 0.000 claims description 18
- 238000000465 moulding Methods 0.000 claims description 12
- 229920006395 saturated elastomer Polymers 0.000 claims description 7
- 238000001035 drying Methods 0.000 claims description 6
- HBMJWWWQQXIZIP-UHFFFAOYSA-N silicon carbide Chemical compound [Si+]#[C-] HBMJWWWQQXIZIP-UHFFFAOYSA-N 0.000 claims description 6
- 238000007582 slurry-cast process Methods 0.000 claims description 6
- 229910052581 Si3N4 Inorganic materials 0.000 claims description 4
- 229910010271 silicon carbide Inorganic materials 0.000 claims description 4
- HQVNEWCFYHHQES-UHFFFAOYSA-N silicon nitride Chemical compound N12[Si]34N5[Si]62N3[Si]51N64 HQVNEWCFYHHQES-UHFFFAOYSA-N 0.000 claims description 4
- 239000002245 particle Substances 0.000 description 21
- 239000000919 ceramic Substances 0.000 description 10
- 238000010586 diagram Methods 0.000 description 5
- 239000004094 surface-active agent Substances 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 229910052574 oxide ceramic Inorganic materials 0.000 description 3
- 239000011224 oxide ceramic Substances 0.000 description 3
- 238000010521 absorption reaction Methods 0.000 description 1
- 229920005822 acrylic binder Polymers 0.000 description 1
- 150000001412 amines Chemical class 0.000 description 1
- 239000011230 binding agent Substances 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- HPNMFZURTQLUMO-UHFFFAOYSA-N diethylamine Chemical compound CCNCC HPNMFZURTQLUMO-UHFFFAOYSA-N 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000003292 glue Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
Landscapes
- Producing Shaped Articles From Materials (AREA)
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は炭化ケイ素、窒化ケイ素等の非酸化物
セラミツクス泥漿の鋳込み成形方法に関し、更に
詳しくは前記泥漿による薄肉品、複雑形状品の成
形に好適な泥漿鋳込みによる成形方法に関する。[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a method for casting and molding a non-oxide ceramic slurry such as silicon carbide or silicon nitride, and more specifically to a method for molding thin-walled products and complex-shaped products using the slurry. The present invention relates to a suitable molding method using slurry casting.
酸化物セラミツクスや非酸化物セラミツクスの
泥漿を石膏型に鋳込み成形する方法は、安価な設
備で多品種少量のセラミツクス成形品を生産する
のに適しており、種々の分野で用いられている。
The method of casting oxide ceramic or non-oxide ceramic slurry into a plaster mold is suitable for producing a wide variety of ceramic molded products in small quantities using inexpensive equipment, and is used in various fields.
酸化物セラミツクス泥漿を石膏型に鋳込み成形
する方法では、酸化物セラミツクスが水との親和
性に優れているため、酸化物セラミツクスを水に
分散した泥漿を石膏型に鋳込んだ場合、その親和
性により泥漿の流動性が大きく、かなりの薄肉品
や複雑形状品の成形が容易にできる。 In the method of casting oxide ceramic slurry into a plaster mold, oxide ceramics have excellent affinity with water. Due to this, the fluidity of the slurry is high, and it is possible to easily mold products with very thin walls or complex shapes.
しかし、炭化ケイ素、窒化ケイ素等の非酸化物
セラミツクスにあつては、水との親和性が悪く、
非酸化物セラミツクスを水に分散した泥漿を石膏
型に鋳込んだ場合、短時間（瞬時）に泥漿中の水
分が石膏型に奪われて泥漿の流動性が失われる。
このため、石膏型の鋳込み空間内に前記泥漿を鋳
込む際、石膏型の鋳込み空間内の薄肉の部分や複
雑形状の部分に泥漿が到達することができず、薄
肉品や複雑形状品の成形が困難となる。 However, non-oxide ceramics such as silicon carbide and silicon nitride have poor affinity with water.
When a slurry in which non-oxide ceramics are dispersed in water is cast into a plaster mold, the water in the slurry is absorbed by the plaster mold in a short period of time (instantaneously), causing the fluidity of the slurry to be lost.
For this reason, when pouring the slurry into the casting space of a plaster mold, the slurry cannot reach thin-walled parts or complex-shaped parts within the casting space of the plaster mold, resulting in the molding of thin-walled products or complex-shaped products. becomes difficult.
非酸化物セラミツクス泥漿における前記のよう
な問題を解消する方法として、界面活性剤等を用
いて非酸化物セラミツクス粒子と水との親和性を
高める方法が知られており、近年、アミン系の解
膠剤を界面活性剤として使用することにより、非
酸化物セラミツクスの鋳込みに効果を上げてい
る。 As a method to solve the above-mentioned problems in non-oxide ceramic slurry, it is known to use surfactants etc. to increase the affinity between non-oxide ceramic particles and water. The use of glue as a surfactant has been effective in casting non-oxide ceramics.
しかしながら、前記のような界面活性剤を使用
する場合、セラミツクス粒子の粒径が異なると、
非酸化物セラミツクス泥漿の流動性を維持する効
果が異なる。
However, when using the above-mentioned surfactants, if the ceramic particles have different particle sizes,
The effect of maintaining the fluidity of non-oxide ceramic slurry is different.
すなわち、同じ水分量を含有するセラミツクス
泥漿においても、セラミツクス粒子の粒径が異な
る場合、その比表面積の違いから粒子間に存在す
る自由水の厚さが異なり、第３図に示すように、
セラミツクス粒子３１の粒径が小さい場合、セラ
ミツクス粒子３１の周囲は親水層３２で覆われ、
これらの間隙に自由水３３が存在し、石膏型に鋳
込んだ場合にも流動性が維持される。 In other words, even in ceramic slurry containing the same water content, if the ceramic particles have different particle sizes, the thickness of the free water existing between the particles will differ due to the difference in specific surface area, as shown in Figure 3.
When the particle size of the ceramic particles 31 is small, the periphery of the ceramic particles 31 is covered with a hydrophilic layer 32,
Free water 33 exists in these gaps, and fluidity is maintained even when cast into a plaster mold.
一方、セラミツクス粒子３１の粒径が大きい場
合、第４図に示すように、自由水３３の層が厚く
なり、この自由水３３とセラミツクス粒子３１と
の親和性よりも石膏の毛管作用による吸水性の方
が強くなり、泥漿中の自由水３３は、石膏型に吸
収されることとなり、その結果、泥漿は短時間で
流動性を失う。すなわち、界面活性剤の作用によ
り得られる親水層３２が存在してもセラミツクス
粒子３１の粒径が大きいために親水層３２によつ
て泥漿の流動性を維持できなくなつてしまう。 On the other hand, when the particle size of the ceramic particles 31 is large, the layer of free water 33 becomes thick, as shown in FIG. becomes stronger, and the free water 33 in the slurry will be absorbed by the plaster mold, resulting in the slurry losing its fluidity in a short time. That is, even if there is a hydrophilic layer 32 obtained by the action of a surfactant, the fluidity of the slurry cannot be maintained by the hydrophilic layer 32 because the particle size of the ceramic particles 31 is large.
本発明の目的は、上記した従来技術の課題を解
決し、非酸化物セラミツクスの泥漿を石膏型に鋳
込み成形する際に、セラミツクス粒子の粒径の如
何にかかわらず、石膏型に鋳込まれた泥漿の流動
性を維持し、石膏型の鋳込み空間内の薄肉の部
分、複雑形状部分にも確実に泥漿の鋳込みを行う
ことができる泥漿鋳込みによる成形方法を提供す
ることにある。 An object of the present invention is to solve the above-mentioned problems of the prior art, and when casting non-oxide ceramic slurry into a plaster mold, regardless of the particle size of the ceramic particles, it is possible to To provide a molding method by slurry casting which maintains the fluidity of slurry and can reliably cast slurry even into thin-walled parts and complex-shaped parts in the casting space of a plaster mold.
上記した目的は、非酸化物セラミツクスの泥漿
を、鋳込み空間の形状・構造に充填し難い狭い領
域・複雑形状の領域を有する石膏型に鋳込み成形
する方法において、前記石膏型を予め飽水状態に
した後、この石膏型の前記鋳込み空間内に前記非
酸化物セラミツクスの泥漿を鋳込み、自然乾燥を
用いるのではなく徐々に石膏型を乾燥させ、着肉
させることによつて達成される。
The above-mentioned purpose is to provide a method for casting and molding a non-oxide ceramic slurry into a plaster mold having a narrow area or a complex-shaped area that is difficult to fill in the shape and structure of the casting space, in which the plaster mold is saturated with water in advance. After that, the non-oxide ceramic slurry is cast into the casting space of the plaster mold, and the plaster mold is gradually dried and inked instead of being naturally dried.
非酸化物セラミツクス粒子を水に分散した泥漿
中の自由水は、予め水分を供給して飽水状態にし
た石膏型への吸水が抑制され、泥漿の流動性が維
持され、泥漿は、石膏型の鋳込み空間内の狭い領
域、複雑な領域の隅々までゆきわたり、型通りの
成形が可能となる。
The free water in the slurry in which non-oxide ceramic particles are dispersed in water is inhibited from absorbing water into the plaster mold, which has been saturated with water by supplying water in advance, and the fluidity of the slurry is maintained. It can reach every corner of narrow and complex areas in the casting space, making it possible to mold according to the mold.
以下、本発明を図面に基づいて説明する。 Hereinafter, the present invention will be explained based on the drawings.
第１図Ａ、第１図Ｂには本発明の泥漿鋳込みに
よる成形方法の一実施例を示す説明図が示されて
いて、第１図Ａには、所定の形状の鋳込み空間の
内壁面を有する石膏型１は、泥漿を鋳込む前に予
め水分が供給されて飽水状態に維持されている。 1A and 1B are explanatory diagrams showing an embodiment of the molding method by slurry casting of the present invention, and FIG. 1A shows the inner wall surface of a casting space having a predetermined shape. The plaster mold 1 is supplied with water in advance and maintained in a water-saturated state before pouring the slurry.
上記の石膏型１の飽水状態は、石膏型１内に形
成される鋳込み空間の形状・内壁面構造によつて
異なり、鋳込み空間の形状・構造に狭い領域、複
雑形状の領域があり、かつ、その領域面積が大き
い場合は石膏型１の飽水率を高くすることが望ま
しい。ただし、石膏型１内に泥漿を鋳込んだ後、
石膏型１を乾燥する必要があるので必要以上に石
膏型１を飽水状態とすることは、作業効率の面か
ら望ましくない。 The water saturation state of the plaster mold 1 described above differs depending on the shape and inner wall surface structure of the casting space formed in the plaster mold 1, and the shape and structure of the casting space has narrow regions, complex-shaped regions, and If the area is large, it is desirable to increase the water saturation rate of the plaster mold 1. However, after pouring the slurry into plaster mold 1,
Since it is necessary to dry the plaster mold 1, it is not desirable to make the plaster mold 1 more saturated with water than necessary from the viewpoint of work efficiency.
したがつて、本発明においては、石膏型１の鋳
込み空間内に泥漿２を鋳込み前に石膏型１に予め
水分を供給し、石膏型１を飽水状態、具体的には
飽水率50％以上の飽水状態にするものである。 Therefore, in the present invention, before pouring the slurry 2 into the casting space of the plaster mold 1, moisture is supplied to the plaster mold 1 in advance to bring the plaster mold 1 into a water-saturated state, specifically, at a water saturation rate of 50%. This is to bring the water to a state of water saturation.
また、前記のように泥漿鋳込み後の石膏型１の
乾燥効率を考慮して50％以上の飽水状態の範囲内
で任意に選定することができる。 Further, as described above, it can be arbitrarily selected within the range of water saturation of 50% or more, taking into consideration the drying efficiency of the plaster mold 1 after slurry casting.
これにより、泥漿２中の自由水が石膏型に吸収
されることがなく、非酸化物セラミツクスの泥漿
の流動性が維持されることとなる。 As a result, free water in the slurry 2 is not absorbed into the plaster mold, and the fluidity of the non-oxide ceramic slurry is maintained.
本発明において、前記泥漿２は、非酸化物セラ
ミツクスを含み、必要に応じてアミン系の解膠
剤、バインダー、イオン交換水を含有するもので
よい。ここで非酸化物セラミツクスとしては、例
えば炭化ケイ素、窒化ケイ素等を代表例として挙
げることができる。 In the present invention, the slurry 2 may contain non-oxide ceramics and, if necessary, an amine peptizer, a binder, and ion-exchanged water. Here, representative examples of non-oxide ceramics include silicon carbide and silicon nitride.
石膏型１に泥漿２を鋳込んだ後、石膏型１を乾
燥し、着肉させるための手段としては、自然に乾
燥を行うのではなく直接石膏型１を温風下で乾燥
する方法、あるいは石膏型１を真空容器中に収納
し、真空容器内を脱気して乾燥する方法等を採用
することができる。直接石膏型１を温風下で乾燥
する方法の場合、石膏型１の亀裂等を防止する点
から50℃以下の温風下で乾燥することが望まし
い。 After pouring the slurry 2 into the plaster mold 1, drying the plaster mold 1 and attaching it to the plaster can be done by directly drying the plaster mold 1 under hot air instead of drying it naturally; A method may be adopted in which the mold 1 is housed in a vacuum container and the inside of the vacuum container is degassed to dry it. In the case of the method of directly drying the plaster mold 1 under warm air, it is desirable to dry under warm air at a temperature of 50° C. or lower in order to prevent the plaster mold 1 from cracking or the like.
実験例
平均粒系10μmの炭化ケイ素粉に解膠剤として
ジエチルアミン（0.5重量％）と、アクリル系バ
インダー（１重量％）とを加え、イオン交換水を
添加し、70重量％の炭化ケイ素粉を含む非酸化物
セラミツクス泥漿を作製した。Experimental example Diethylamine (0.5% by weight) as a deflocculant and an acrylic binder (1% by weight) were added to silicon carbide powder with an average particle size of 10 μm, and ion-exchanged water was added, and 70% by weight silicon carbide powder was added. A non-oxide ceramic slurry was prepared containing:
上記で作製した泥漿をボールミルにて24時間混
合し、真空脱泡を行つたところ、得られた泥漿の
粘度は30cpsであつた。 The slurry produced above was mixed in a ball mill for 24 hours and vacuum defoamed, and the viscosity of the slurry obtained was 30 cps.
次に第１図Ａに示すように、縦×横×深さが10
mm×４mm×50mmの鋳込み空間を有する石膏型１
を、飽水率70％に調整した後、この石膏型１の鋳
込み空間内に前記泥漿２を鋳込み、更に充分な泥
漿２を与えつつ、50℃の恒温槽中で30分間乾燥し
た後、脱型した。 Next, as shown in Figure 1A, the length x width x depth is 10
Plaster mold 1 with a casting space of mm x 4 mm x 50 mm
After adjusting the water saturation rate to 70%, the slurry 2 is poured into the casting space of this plaster mold 1, and while giving a sufficient amount of slurry 2, it is dried for 30 minutes in a constant temperature bath at 50°C, and then removed. I molded it.
この結果、第１図Ｂに示すように石膏型１の鋳
込み空間に対応した成形体３を得ることができ、
泥漿２が石膏型１の鋳込み空間内に充分にいきわ
たつたことが判明した。 As a result, as shown in FIG. 1B, a molded body 3 corresponding to the casting space of the plaster mold 1 can be obtained,
It was found that the slurry 2 had sufficiently spread into the casting space of the plaster mold 1.
比較実験例
石膏型１を飽水状態とすることなく、泥漿２を
鋳込んだ他は前記実験例と同様にして石膏型１に
よる鋳込み空間内による鋳込み成形を行つた。Comparative Experimental Example Casting was carried out in the casting space of the plaster mold 1 in the same manner as in the experimental example described above, except that the slurry 2 was cast without making the plaster mold 1 saturated with water.
この結果、第２図に示すように泥漿２は石膏型
１の鋳込み空間の入口から数mmまでしか注入され
ておらず鋳込み空間形状の成形を行うことができ
なかつた。 As a result, as shown in FIG. 2, the slurry 2 was injected only a few mm from the entrance of the casting space of the plaster mold 1, making it impossible to form the shape of the casting space.
以上のように本発明によれば、水との親和性が
ない非酸化物セラミツクス泥漿の場合にも、泥漿
中の自由水の石膏型への吸収が抑制されるととも
に、泥漿の流動性が維持されることによつて、鋳
込み空間の形状・構造に充填し難い狭い領域・複
雑形状の領域を有する石膏型であつても安価な設
備による薄肉品、複雑形状品の成形が可能とな
る。
As described above, according to the present invention, even in the case of non-oxide ceramic slurry that has no affinity with water, absorption of free water in the slurry into the plaster mold is suppressed, and the fluidity of the slurry is maintained. By doing so, it becomes possible to mold thin-walled products and complex-shaped products using inexpensive equipment even if the plaster mold has a narrow region or complex-shaped region that is difficult to fill in the shape and structure of the casting space.
第１図Ａは本発明の方法を示すための説明図、
第１図Ｂは第１図Ａの方法により得られた成形体
を示す斜視図、第２図は従来例の成形方法を示す
ための説明図、第３図は平均粒径の小さい非酸化
物セラミツクス粒子を分散した泥漿の流動特性を
示す説明図、第４図は平均粒径が大きい非酸化物
セラミツクス粒子を分散した泥漿の流動特性を示
す説明図である。
１……石膏型、２……泥漿、３……成形体。
FIG. 1A is an explanatory diagram for showing the method of the present invention,
Figure 1B is a perspective view showing a molded product obtained by the method in Figure 1A, Figure 2 is an explanatory diagram showing a conventional molding method, and Figure 3 is a non-oxide material with a small average particle size. FIG. 4 is an explanatory diagram showing the fluidity characteristics of a slurry in which ceramic particles are dispersed. FIG. 4 is an explanatory diagram showing the fluidity characteristics of a slurry in which non-oxide ceramic particles having a large average particle size are dispersed. 1... Plaster mold, 2... Slime, 3... Molded body.
Claims (1)
の形状・構造に充填し難い狭い領域・複雑形状の
領域を有する石膏型に鋳込み成形する方法におい
て、前記石膏型を予め飽水状態にした後、この石
膏型の前記鋳込み空間内に前記非酸化物セラミツ
クスの泥漿を鋳込み、自然乾燥を用いるのではな
く徐々に石膏型を乾燥させ、着肉させることを特
徴とする泥漿鋳込みによる成形方法。 ２ 前記石膏型の飽水状態が50％以上である請求
項１記載の泥漿鋳込みによる成形方法。 ３ 前記非酸化物セラミツクスが、炭化ケイ素ま
たは窒化ケイ素である請求項１記載の泥漿鋳込み
による成形方法。[Scope of Claims] 1. In a method of casting and molding a non-oxide ceramic slurry into a plaster mold having a narrow region or a region with a complex shape that is difficult to fill in the shape and structure of the casting space, the plaster mold is saturated with water in advance. After forming the slurry, the non-oxide ceramic slurry is cast into the casting space of the plaster mold, and the plaster mold is gradually dried and inked instead of using natural drying. Molding method. 2. The molding method by slurry casting according to claim 1, wherein the water saturation state of the plaster mold is 50% or more. 3. The molding method by slurry casting according to claim 1, wherein the non-oxide ceramic is silicon carbide or silicon nitride.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP13043889A JPH02307707A (en) | 1989-05-24 | 1989-05-24 | Method for forming by slurry casting |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP13043889A JPH02307707A (en) | 1989-05-24 | 1989-05-24 | Method for forming by slurry casting |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH02307707A JPH02307707A (en) | 1990-12-20 |
| JPH0446721B2 true JPH0446721B2 (en) | 1992-07-30 |
Family
ID=15034248
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP13043889A Granted JPH02307707A (en) | 1989-05-24 | 1989-05-24 | Method for forming by slurry casting |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH02307707A (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2747186B2 (en) * | 1992-03-30 | 1998-05-06 | 日本碍子株式会社 | Casting mold and method of manufacturing the same |
| 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 |
-
1989
- 1989-05-24 JP JP13043889A patent/JPH02307707A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPH02307707A (en) | 1990-12-20 |
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