KR20230149987A - Non-aqueous ceramic composition for slip casting and molding method - Google Patents

Abstract

The present invention relates to a non-aqueous ceramic composition for slip casting and a molding method thereof. The non-aqueous ceramic composition for slip casting comprises: ceramic powder which has hydration reactivity; an alcohol-based organic solvent which is as a carrier for preparing suspension; and a polymer-based dispersant which has alcohol solubility as a dispersant.

Description

Non-aqueous ceramic composition for slip casting and molding method}

The composition of the present invention uses an organic solvent that does not contain water to form a slip for slip casting of a ceramic powder material that has a hydration reaction. It relates to a composition for manufacturing. In particular, in order to reduce the hazards that may generally appear when using organic solvents, the non-aqueous ceramic composition for forming nails is characterized in that it is manufactured using an alcohol-based organic solvent with non-toxicity or low toxicity. will be.

The composition according to the present invention is a form in which fine ceramic solid powder particles are evenly dispersed in a low-hazard alcoholic organic solvent in which an agent that has the function of wetting and dispersing ceramic powder particles, that is, a dispersant is dissolved. Refers to a non-aqueous liquid suspension. In addition, the present invention consists of a method of manufacturing a ceramic molded body with a desired size and shape by pouring a non-aqueous suspension of the composition into a mold for forming a needle (hereinafter referred to as a mold) made of a porous material.

The molding method called slip casting is a type of ceramic molding method that turns powdered material into a molded body with the desired shape and dimensions. It is a well-known technology that has a long history along with ceramic manufacturing technology.

The basic structure of this molding method is, first, to evenly disperse the raw material powder in a liquid (usually water. The liquid used to give the solid particle powder the high fluidity required for the molding process is called a vehicle). Suspension (Suspension) refers to a phenomenon in which solid particles do not sink in a liquid, but are evenly distributed (dispersed) throughout the entire liquid and appear cloudy. In this case, a suspension made using water as the liquid is the stage of preparing (especially called a slip);

Preparing a porous mold (usually a plaster mold) with an empty space having a desired shape and dimension formed therein;

The suspension is poured into the mold, and after a certain period of time (at this time, the liquid flows out toward the mold due to capillary action at the contact interface between the mold and the suspension, forming a molded body layer composed only of powder at the interface), the remaining suspension in the mold is released to the outside. Pour and remove;

Finally, it consists of the step of separating the powder molded body formed in the mold from the mold after a certain period of time (at this time, the size of the molded body layer is dried and the molded body shrinks accordingly).

However, when some ceramic materials (oxides, carbides, nitrides, borides, silicides, etc.) come in contact with water, their surface state may change or a hydration reaction may occur. Representative cases are aluminum nitride (AlN + 4H ₂ O = Al(OH) ₃ + NH ₄ OH) and magnesium oxide (MgO + H ₂ O = Mg(OH) ₂ ).

For these materials, water cannot be used as a carrier (liquid) when preparing a suspension, and an organic solvent must be used. Accordingly, non-aqueous compositions for knee molding, such as U.S. Patent No. 5,238,986 (Lionel C. Montgomery, "Nonaqueous Composition for Slip Casting or Cold Forming Refractory Material into Solid Shapes", United States Patent 5,238,986, Aug. 24, 1993), etc. It has been proposed.

In these patents, for the preparation of a suspension, 5 to 12% of low-molecular weight polymeric cyclopentadiene, or 0.5 to 2.2% of polymeric vinyl chloride/vinyl acetate (based on the weight of the suspension) is used. 14%/86%)) The mixed solution is being used as a dispersant. In addition, it is suggested that it is preferable to use an organic solvent ketone such as MEK (Methyl Ethyl Ketone) as a carrier (liquid).

However, due to the nature of the work, knee molding takes a relatively long time to form, and therefore the worker performing the work is exposed to organic solvents for a considerable amount of time. Organic solvents have different degrees of toxicity depending on their type, but in general, most are harmful to the human body.

Therefore, considering the increase in costs due to the expansion of safety equipment to prevent worker health and hazards, it would be desirable to develop a non-aqueous nail molding composition using an organic solvent with low human hazard and a molding method using the composition. . In addition, alcohol-based organic solvents are cheaper than other organic solvents, so they have the advantage of enabling non-aqueous nail molding more economically.

The purpose of the present invention is to provide a non - aqueous ceramic composition for slip casting molding that has low toxicity and economical advantages, and a method of forming a ceramic molded body using the same.

In order to achieve the above-mentioned object, the present invention provides: a ceramic powder having hydration reactivity; Alcohol-based organic solvent as a carrier for preparing a suspension; and a polymer-based dispersant having alcohol solubility as a dispersant. A non - aqueous ceramic composition for slip casting molding is provided.

In the present invention, the ceramic powder may include one or more types selected from metal oxides, carbides, nitrides, borides, and silicides.

In the present invention, the ceramic powder may include one or more types selected from magnesium oxide and aluminum nitride.

In the present invention, aluminum nitride may be a mixture of 1 to 10% by weight of yttrium oxide.

In the present invention, the content of ceramic powder may be 63 to 87% by weight based on the total weight of the composition.

In the present invention, the average particle diameter of the ceramic powder may be 0.1 to 10 ㎛.

In the present invention, the alcohol-based organic solvent may include one or more types selected from alcohols having 1 to 6 carbon atoms.

In the present invention, the alcohol-based organic solvent may include at least one selected from ethyl alcohol and isopropyl alcohol.

In the present invention, the content of the alcohol-based organic solvent may be 12 to 36% by weight based on the total weight of the composition.

In the present invention, the alcohol solubility of the polymer-based dispersant may be 400 g/l or more at 20°C.

In the present invention, the molecular weight of the polymer-based dispersant may be 5,000 g/mol or more.

In the present invention, the content of the polymer-based dispersant may be 0.01 to 5% by weight based on the total weight of the composition and 0.1 to 5% by weight based on the weight of the ceramic powder.

In the present invention, the solid content ratio of the suspension of the composition may be 20 to 60% by volume based on the total volume of the suspension.

In addition, the present invention is a method of forming a ceramic molded body using the above-described non - aqueous ceramic composition for slip casting molding, comprising: preparing a carrier by dissolving a dispersant in an alcohol-based organic solvent; Preparing a composition by adding ceramic powder of a desired composition ratio to the prepared carrier; Preparing a suspension by uniformly mixing the prepared composition; Pouring the prepared suspension into a porous mold to form a molded body; Separating the formed molded body from the mold after a certain period of time has elapsed; and drying the separated molded body.

The molding method according to the present invention may further include the step of firing the dried molded body.

The non - aqueous ceramic composition for slip casting according to the present invention has low harmfulness and economical advantages by using an alcohol-based organic solvent.

1 is a photograph of a molded body according to Example I of the present invention.
Figure 2 is a firing schedule used in Example I of the present invention.
Figure 3 is a photograph of a molded body according to Example II of the present invention.
Figure 4 is a photograph of a molded body according to Example III of the present invention.
Figure 5 is a photograph of a molded body according to Example IV of the present invention.

Hereinafter, the present invention will be described in detail.

The present invention relates to a non - aqueous ceramic composition for slip casting, wherein non-aqueous can mean that it does not contain any water, or that it contains substantially or little water.

The composition according to the present invention includes ceramic powder having hydration reactivity; Alcohol-based organic solvent as a carrier for preparing a suspension; And as a dispersant, it may include a polymer-based dispersant having alcohol solubility.

Ceramic powder is used as the main raw material. Ceramic powder has hydration reactivity, which means that it is reactive with water or moisture, which may mean that it changes the surface state or causes a hydration reaction when it comes in contact with water.

The ceramic powder may contain one or more types selected from metal oxides, carbides, nitrides, borides, and silicides. The metal is not particularly limited and may be, for example, magnesium, aluminum, etc.

Specifically, for example, the ceramic powder may include one or more types selected from magnesium oxide and aluminum nitride. Aluminum nitride may be mixed with yttrium oxide to improve sinterability and thermal conductivity. That is, a mixture of aluminum nitride and yttrium oxide can be used, and the content of yttrium oxide may be, for example, 1 to 10% by weight, preferably 3 to 7% by weight, based on the total weight of the mixture.

The content of the ceramic powder may be, for example, 63 to 87% by weight, preferably 65 to 85% by weight, and more preferably 67 to 83% by weight, based on the total weight of the composition. The average particle diameter of the ceramic powder may be, for example, 0.1 to 10 ㎛, preferably 0.2 to 5 ㎛.

Alcohol-based organic solvents are used as vehicles for preparing suspensions. The alcohol-based organic solvent may include one or more types of alcohols having 1 to 6 carbon atoms.

Specifically, for example, the alcohol-based organic solvent may include one or more selected from methyl alcohol, ethyl alcohol, propyl alcohol, butyl alcohol, pentyl alcohol, hexyl alcohol, and isomers thereof (isopropyl alcohol, etc.) there is.

More specifically, for example, the alcohol-based organic solvent may include at least one selected from ethyl alcohol and isopropyl alcohol.

The content of the alcohol-based organic solvent may be, for example, 12 to 36% by weight, preferably 14 to 34% by weight, and more preferably 16 to 32% by weight, based on the total weight of the composition. The purity of the alcohol-based organic solvent may be, for example, 99% or higher, preferably 99.9% or higher.

A polymer-based dispersant is used as an agent that has the function of wetting and dispersing ceramic powder particles. The polymer-based dispersant may be a dispersant having alcohol solubility, preferably a dispersant having high solubility in alcohol-based solvents.

The alcohol solubility of the polymer-based dispersant may be, for example, 400 g/l or more, preferably 500 g/l or more at 20°C. The upper solubility limit may be, for example, 700 g/l, or 600 g/l.

The polymer-based dispersant is preferably a high molecular weight dispersant. The molecular weight of the polymer-based dispersant may be, for example, 5,000 g/mol or more, preferably 10,000 g/mol or more. The upper molecular weight limit may be, for example, 300,000 g/mol, 100,000 g/mol, 50,000 g/mol, or 30,000 g/mol. Meanwhile, low molecular weight dispersants may have a molecular weight of less than 5,000 g/mol.

Polymer dispersants with high alcohol solubility and high molecular weight include, for example, phosphoric acid ester salts of high molecular weight copolymers (polyacrylate, polyurethane, polyester, etc.) with pigment affinity groups (amine group, imine group, phosphate group, etc.). (BYK brand name DISPERBYK-145, etc.), modified polyacrylate polymer (BASF brand name EFKA-4401, etc.) can be used.

DISPERBYK-145 is CAS number 398475-96-2, and the chemical name and common name are 1,2-Ethanediamine, polymer with aziridine, reaction product with 2-propenoic acid, 2-ethylhexyl ester, salt with oxirane, methyl-, polymer with It is oxirane, monobutyl ether, and phosphate, and its alcohol solubility measured at 20℃ according to the OECD Test Guideline 105 method is more than 522 g/l, so it can be completely dissolved in alcohol.

The content of the polymer-based dispersant may be, for example, 0.01 to 5% by weight, preferably 0.3 to 3% by weight, based on the total weight of the composition. Additionally, the content of the polymer-based dispersant may be, for example, 0.1 to 5% by weight, preferably 0.3 to 3% by weight, based on the weight of the ceramic powder.

Additionally, the composition may further include titanium oxide, niobium oxide, etc. Their content may each independently be, for example, 0.01 to 1% by weight, preferably 0.1 to 0.5% by weight, based on the total weight of the composition. Their particle diameter may be, for example, 10 μm or less, preferably 1 μm or less. Their purity may be 90% or more, preferably 95% or more.

The composition may be a suspension. The solid content ratio of the suspension may be, for example, 20 to 60% by volume, preferably 30 to 55% by volume, based on the total volume of the suspension. Solid content may include ceramic powder, etc.

In addition, the present invention provides a method of forming a ceramic molded body using the above-described non - aqueous ceramic composition for slip casting molding.

The molding method according to the present invention includes the steps of preparing a carrier by dissolving a dispersant in an alcohol-based organic solvent; Preparing a composition by adding ceramic powder of a desired composition ratio to the prepared carrier; Preparing a suspension by uniformly mixing the prepared composition; Pouring the prepared suspension into a porous mold to form a molded body; Separating the formed molded body from the mold after a certain period of time has elapsed; And it may include the step of drying the separated molded body, and may additionally include the step of firing the dried molded body.

When mixing each component, for example, a ball can be placed in a container and ball milled. The material of the container may be, for example, polyethylene, and the volume of the container may be, for example, 100 to 2,000 ml. The material of the ball may be, for example, ZrO ₂ , the diameter of the ball may be, for example, 1 to 20 mm, and the filling amount of the ball in the container may be, for example, 30 to 70%. The ball milling time may be, for example, 1 to 10 minutes for a dispersant, and may be, for example, 1 to 30 hours for a ceramic powder.

The material of the mold may be, for example, gypsum, and the shape of the mold may be, for example, a crucible shape. The retention time of the slurry in the mold may be, for example, 5 to 60 minutes. Drying in the mold can be performed, for example, in room temperature air for 10 to 30 hours. Drying after demolding can be performed, for example, in room temperature air for 5 to 20 hours and then completely dried in an oven. The temperature of the oven may be, for example, 30 to 60° C., and the oven drying time may be, for example, 1 to 5 hours.

Firing can be performed by repeating the step of raising the temperature to a specific temperature and maintaining it at that temperature for a certain time multiple times (for example, 2 to 10 times) while increasing the temperature. In the final stage of firing, the firing temperature may be, for example, 1,300 to 1,600° C., and the firing time may be, for example, 0.5 to 3 hours.

In short, the present invention is based on the discovery of a new non-aqueous lacquer molding composition for replacing conventional non-aqueous suspension compositions for lacquer molding containing hazardous ingredients with low or no hazardous suspension compositions.

The non-aqueous nijang molding suspension composition of the present invention has fine ceramic solid powder particles evenly distributed in a low-hazard alcoholic organic solvent in which a high molecular weight polymer-based copolymerization agent (dispersant) with the function of wetting and dispersing ceramic powder particles is dissolved. It may be a non-aqueous liquid suspension in dispersed form.

Nijang forming of a ceramic material according to the present invention:

Step-1: Preparing a carrier dissolved by adding a dispersant to an alcohol-based solvent;

Step-2: Injecting ceramic raw material powder of the desired composition ratio into the carrier prepared in Step-1;

Step-3: Uniformly mixing the composition prepared in Step-2;

Step-4: pouring the suspension prepared in step-3 into a porous mold to form a molded body, and separating the formed molded body from the mold after a certain period of time; And it may consist of drying the demolded molded body.

The dispersant in step-1 may include various non-aqueous dispersants commonly used in preparing non-aqueous ceramic suspensions, including phosphoric ester salts of copolymers. At this time, the amount of dispersant added may be 0.1 to 5% of the weight of the raw material powder, and preferably 0.3 to 3%.

When knee molding is performed, the liquid is sucked toward the mold by capillary action from the suspension near the interface with the mold, so only solid powder remains, and a powder molding layer can be formed at the interface area. And as time passes and additional liquid continues to be sucked from the residual suspension, the thickness of the molded body layer may gradually increase.

However, the liquid being sucked out at this time contains not only the dissolved polymer dispersant, but also binders and plasticizers, which gradually deposit or precipitate on the inner walls of the pore channels in the mold as the mold dries. It can be done. If this phenomenon continues, the capillary pressure of the mold decreases as it is used, which may ultimately lead to an increase in the time required to form a molding layer of a certain thickness. In other words, it appears as an increase in work time, which can cause problems that reduce productivity.

Therefore, there is a need to minimize the use of organic additives such as binders/plasticizers, as well as the use of dispersants. For this reason, the present invention is characterized by excluding the use of binders/plasticizers, and is also characterized by minimizing the use of dispersants to 0.3 to 3%.

In particular, when selecting a polymer dispersant that acts as a dispersant, deposition or precipitation within the mold can be minimized by selecting a dispersant that has high solubility in alcohol-based solvents. In addition, when a mold that has been used more than a certain number of times over a long period of time is immersed in an alcohol-based solvent, the dispersant polymer deposited/precipitated in the mold is characterized by using a dispersant that can be easily dissolved in alcohol.

The ceramic raw material powder in step-2 includes magnesium oxide (MgO), and various ceramic (oxide, carbide, nitride, boride, silicide, etc.) powders that are reactive with water or moisture can be used.

At this time, if the powder particles are too fine, dispersion becomes difficult due to an increase in the specific surface area, which causes excessive administration of the dispersant. Conversely, if the size of the powder particles is too coarse, the size of the powder particles becomes difficult to disperse in the suspension. There may be a problem that the suspension does not float stably and sinks due to its own weight, which reduces the stability of the suspension. Therefore, the size of the raw material powder particles can range from 0.1 to 10 ㎛ based on the average particle diameter, and preferably 0.2 to 5 ㎛.

Meanwhile, the fraction of solid volume compared to the total volume of the suspension (hereinafter referred to as solid loading) is very important. If the solid content is less than 20% by volume (vol.), there may be a problem in that the thickness of the molding layer during molding of the needle may be very thin or it may take a long time to mold to the desired thickness. On the other hand, if the solid content is more than 55% by volume, not only an excessively thick molding layer is created during molding, but also the liquid in the residual suspension remaining in the center of the mold is sucked into the mold, causing a loss of fluidity. . Accordingly, the solid content ratio of the suspension for knee paste molding is preferably 30 to 55% by volume.

Composition mixing in step-3 includes ball-milling, various grinding and mixing methods (stirring, ultrasonication, attrition-milling, bead) used in general ceramic processes. -Milling (bead-milling, vibratory milling, planetary milling, etc.) are all possible. At this time, considering economics and mass production, ball-milling is preferable, but is not limited to this.

The mold in step-4 can be any porous material containing a large number of micro open pores connected to the external atmosphere, such as polymer, metal, or ceramic. The most widely used mold material is gypsum, and plaster molds made using it are the most economical and easy to make. Although a plaster mold was used in the present invention, it is not necessarily limited to this. If you want a mold that is precise and can be used repeatedly for a long time, for example, cold isostatic pressing aluminum oxide powder and machining the porous alumina ceramic fired at about 1400 to 1500°C into the shape of a mold. You can also use it.

Example I

The process of manufacturing a non-aqueous knee molding slip and using it to mold the knee is as follows. To prepare the composition, 99.95% purity ethyl alcohol and magnesium oxide (MgO) powder (Daejeong Chemical Gold Co., Ltd.), 95% purity TiO ₂ (Rutile) with a particle diameter of 1 ㎛ or less and 99.9% purity Nb ₂ O ₅ powder (Kojundo) Chem. Lab. Co., Ltd.), and DISPERBYK-145 (BYK-Chemie GmbH) were used.

At this time, the overall composition of the prepared composition is as shown in Table 1. Accordingly, first, about half of ZrO ₂ balls with a diameter of 10 mm were filled in a polyethylene container with a volume of 500 ml, and 70 g of ethyl alcohol and a dispersant (DISPERBYK) were filled. -145) After adding 2.7 g, ball milling was performed for about 3 minutes (for uniform mixing of the dispersant and ethyl alcohol). In addition, 0.54 g of titanium oxide powder and 0.46 g of niobium oxide powder were added to the prepared carrier liquid, and then ball milled for about 5 minutes. 180 g of magnesium oxide was added here, and then ball milling was performed for about 24 hours.

The ball milled slurry (slip) was poured into a gypsum mold made in the shape of a crucible, kept for about 20 minutes, and then the slurry remaining inside the mold was poured out and removed. The mold with the molded body formed inside was dried in room temperature air until the molded body and the mold wall were naturally separated and the molded body had enough strength to be demolded (it took about 12 to 24 hours). After demolding from the plaster mold, it was dried in the air at room temperature for an additional 12 hours and then completely dried in an oven at 45°C for 3 hours.

The appearance of the molded body created in this way is shown in the left photo of Figure 1. The manufactured magnesium oxide molded body was fired according to the firing schedule shown in FIG. 2 (at this time, the firing shrinkage rate was about 18%), and the appearance of the resulting magnesium oxide crucible sintered body is shown in the right photo of FIG. 1. As can be seen here, it can be seen that by using the non-aqueous lacquer molding composition according to the present invention, lacquer molding of a ceramic material in which a hydration reaction occurs, etc. is possible.

matter Weight percentage [%] Weight [g] note ethyl alcohol 27.60 70 dispersant 1.06 2.7 BYK-145 TiO ₂ 0.21 0.54 Nb ₂ O ₅ 0.18 0.46 MgO 70.95 180

Example II

As can be seen in Table 2, Example I It was carried out in the same manner as.

The appearance of the molded body created in this way is shown in the left photo of Figure 3. The manufactured magnesium oxide molded body was fired according to the firing schedule shown in FIG. 2 (calcination temperature was 1500°C, firing time was 1 hour), and the appearance of the resulting magnesium oxide crucible sintered body is shown in the photo on the right of FIG. 3.

matter Weight percentage [%] Weight [g] note ethyl alcohol 30.34 80 dispersant 1.03 2.7 BYK-145 TiO ₂ 0.20 0.54 Nb ₂ O ₅ 0.17 0.46 MgO 68.26 180

Example III

In Example III, to determine whether aluminum nitride (AlN), another ceramic material well known to undergo a hydration reaction, can be formed into a non-aqueous nitride. A suspension was prepared with the composition ratio as shown in Table 3. The aluminum nitride raw material powder used at this time was commercially supplied aluminum nitride powder (wt.) with 5 wt.% yttrium oxide (Y ₂ O ₃ ) already added and mixed to improve sinterability and thermal conductivity. Grade JC, Toyoaluminum).

To prepare a suspension, fill about half of ZrO ₂ balls with a diameter of 10 mm in a polyethylene container with a volume of 500 ml, add 70 g of ethyl alcohol and 1.5 g of a dispersant (DISPERBYK-145), (dispersant and ethyl alcohol) (for uniform mixing) was ball milled for about 3 minutes. 318 g of aluminum nitride was added here, and then ball milling was performed for about 3 hours.

The aluminum nitride suspension prepared in this way with a solid content of 51.4% by volume was molded in the same manner as in Example 1. However, in the aluminum nitride molding, a small gourd-shaped mold was used instead of a crucible-shaped mold. The appearance of the molded body created in this way is shown in Figure 4.

matter Weight percentage [%] Weight [g] note ethyl alcohol 17.97 70 dispersant 0.39 1.5 DISPERBYK-145 AlN (5 wt% Y ₂ O ₃ ) 81.64 318

Example IV

In Example IV, isopropyl alcohol was used as an alcohol-based organic solvent, EFKA 4401 was used as a dispersant, and the solid content was adjusted to 44.4% by volume, and was carried out in the same manner as Example III. The appearance of the molded body created in this way is shown in Figure 5.

matter Weight percentage [%] Weight [g] note isopropyl alcohol 22.47 70 dispersant 0.48 1.5 EFKA 4401 AlN (5 wt% Y ₂ O ₃ ) 77.05 240

As described above, the present invention is an alcohol-based carrier used in the production of a suspension for forming a ceramic (oxide, carbide, nitride, boride, silicide, etc.) powder material that is reactive (hydration reactive) with water or moisture. The present invention provides a method for producing a composition suspension composed of an organic solvent, a polymer-based dispersant with alcohol solubility as a dispersant, and ceramic powder particles with hydration reactivity, and a method for forming a Nijang using the same.

In the suspension composition according to the present invention, the alcohol-soluble polymer-based dispersant of the composition is characterized by addition in the range of 0.1 to 5.0% by weight based on the weight of the raw material powder, and the solid content ratio of the hydration-reactive ceramic raw material powder of the composition is 20% in the volume of the total suspension. It is characterized in that it has a range of 60% by volume, and the particle size of the ceramic raw material powder of the composition is 0.1 to 10 ㎛ based on the average particle size.

Claims (15)

Ceramic powder with hydration reactivity;
Alcohol-based organic solvent as a carrier for preparing a suspension; and
A non - aqueous ceramic composition for slip casting comprising a polymer-based dispersant having alcohol solubility as a dispersant. According to paragraph 1,
A non -aqueous ceramic composition for slip casting, wherein the ceramic powder contains at least one selected from metal oxides, carbides, nitrides, borides, and silicides. According to paragraph 1,
A non -aqueous ceramic composition for slip casting, wherein the ceramic powder includes at least one selected from magnesium oxide and aluminum nitride. According to paragraph 3,
A non- aqueous ceramic composition for slip casting molding, wherein aluminum nitride is mixed with 1 to 10% by weight of yttrium oxide. According to paragraph 1,
A non -aqueous ceramic composition for slip casting molding, wherein the content of ceramic powder is 63 to 87% by weight based on the total weight of the composition. According to paragraph 1,
A non -aqueous ceramic composition for slip casting, wherein the ceramic powder has an average particle diameter of 0.1 to 10 ㎛. According to paragraph 1,
A non -aqueous ceramic composition for slip casting molding, wherein the alcohol-based organic solvent contains at least one type selected from alcohols having 1 to 6 carbon atoms. According to paragraph 1,
A non -aqueous ceramic composition for slip casting molding, wherein the alcohol-based organic solvent includes at least one selected from ethyl alcohol and isopropyl alcohol. According to paragraph 1,
A non-aqueous ceramic composition for slip casting, wherein the content of the alcohol - based organic solvent is 12 to 36% by weight based on the total weight of the composition. According to paragraph 1,
A non - aqueous ceramic composition for slip casting, wherein the alcohol solubility of the polymer-based dispersant is 400 g/l or more at 20°C. According to paragraph 1,
A non - aqueous ceramic composition for slip casting, wherein the molecular weight of the polymer-based dispersant is 5,000 g/mol or more. According to paragraph 1,
A non-aqueous ceramic composition for slip casting molding, wherein the content of the polymer-based dispersant is 0.01 to 5% by weight based on the total weight of the composition and 0.1 to 5% by weight based on the weight of the ceramic powder . According to paragraph 1,
A non -aqueous ceramic composition for slip casting molding, wherein the solid content ratio of the suspension of the composition is 20 to 60% by volume with respect to the total volume of the suspension. A method of forming a ceramic molded body using the non - aqueous ceramic composition for slip casting molding according to claim 1:
Preparing a carrier dissolved by adding a dispersant to an alcohol-based organic solvent;
Preparing a composition by adding ceramic powder of a desired composition ratio to a prepared carrier;
Preparing a suspension by uniformly mixing the prepared composition;
Pouring the prepared suspension into a porous mold to form a molded body;
Separating the formed molded body from the mold after a certain period of time has elapsed; and
A method of forming a ceramic molded body, comprising the step of drying the separated molded body. According to clause 14,
A method of forming a ceramic molded body, further comprising the step of firing the dried molded body.