JPH0891940A - Optical molding method for ceramic - Google Patents

Abstract

PURPOSE: To provide a method for molding ceramic capable of molding ceramic into a desired shape without requiring a fixed mold and minimizing post processing after molding. CONSTITUTION: Ceramic hardened layers are successively laminated in a fixed shape by (a) a process for preparing a slurry comprising 100 pts.wt. of ceramic powder, 0.5-50 pts.wt. of a binder having photo-setting properties and 0-10 pts.wt. of a solvent, (b) a process for forming a ceramic slurry layer in fixed thickness by using the slurry, irradiating the slurry layer with light and hardening the slurry layer to form a ceramic hardened layer and (c) a process for continuously carrying out operations similar to those of the process (b) fixed times on the ceramic hardened layer obtained by the process (b) to form a solid formed article of ceramic.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for molding ceramics having excellent properties such as heat resistance, chemical resistance and oxidation resistance. More specifically, it is a photocurable ceramic which undergoes photopolymerization or photocrosslinking reaction. The present invention relates to an optical molding method for ceramics, in which a powdered slurry is irradiated with light to utilize photocuring to obtain a ceramic body having a predetermined shape.

[0002]

2. Description of the Related Art The manufacturing process of ceramics includes a molding process of ceramic powder which has an important influence on the characteristics of a sintered body. Conventionally, as a method of molding a three-dimensional ceramics-shaped body using ceramics powder, a method of using a molding die having a predetermined shape is generally used. For example, dry pressure molding of dry powder using a mold, slip cast molding of slurry containing powder using a water-absorbing mold such as a plaster mold, gel molding method, etc. A method of solidifying and molding by a reaction such as cross-linking or aggregation is known.

[0003]

However, as described above, in all of the conventional methods for forming a three-dimensional ceramic body, the shape that can be formed is limited because a specific mold is used. That is, a molded product having a complicated special shape is difficult to mold, and even if it is molded, there is a problem in homogeneity, and defects such as cracks and cracks are likely to occur, resulting in a low molding yield. It was Further, generally, a mold such as a metal mold is expensive, and it is worn out for a long period of time, so that it is necessary to periodically replace the mold, which is one of the causes of increasing the cost of the ceramic product. The inventors
In view of the problem of ceramics molding by the above-mentioned conventional method, a three-dimensional ceramics molded body, especially a molded body having a complicated shape or a special shape can be easily molded with a good yield without using an expensive molding die, and the obtained molded body is homogeneous. For the purpose of providing a molding method, the present invention thoroughly reviewed the molding method and various ceramic technologies such as ceramic molding materials, and further studied various molding technologies in different technical fields. In particular, we reexamined the plastics field, which has made remarkable progress in molding technology. For example, JP-A-56-144478, JP-B-63-40650 and JP-A-3-10.
The techniques proposed in Japanese Patent No. 4626 and the like are three-dimensional molding by stereolithography using a plastic composition having optical reactivity such as photosensitivity.

However, these are all related to the molding of plastics, and it is not possible to obtain a practical molded product having excellent mechanical properties which can be used for structural members such as various mechanical devices. In addition, Japanese Examined Japanese Patent Publication Sho 63-40650
The publication only discloses the incorporation of ceramic powder as a modifying material, and has not yet examined a ceramic molding method using an optical method with the ceramic powder as a main component. In particular, since the ceramic product is normally sintered at a high temperature of about 800 ° C. or higher, the influence of the added optical reaction component is unknown. Therefore, the present inventors have completed various aspects of the present invention as a result of various studies to apply the above plastic molding technique to ceramics molding.

[0005]

According to the present invention, (a)
A step of preparing a slurry containing 100 parts by weight of ceramic powder, 0.5 to 50 parts by weight of a binder having a photo-curing property, and 0 to 10 parts by weight of a solvent, and (b) a ceramic having a predetermined thickness using the slurry. A step of forming a rally layer and irradiating light to cure the slurry layer to a ceramic cured layer; and (c) the step (b) on the ceramic cured layer obtained in the step (b). An optical molding method for ceramics, comprising a step of continuously repeating the same operation a predetermined number of times, and successively laminating the hardened ceramic layers into a predetermined shape to form a three-dimensionally shaped ceramic body. Will be provided.

(1) A step of holding a ceramic slurry containing 100 parts by weight of ceramic powder, 0.5 to 50 parts by weight of a binder having a photo-curing property, and 0 to 10 parts by weight of a solvent in a container, (2) A step of setting a support table at a predetermined depth from the surface of the ceramic slurry in the ceramic slurry, (3) irradiating the surface of the ceramic slurry in the container with light in a predetermined shape, and Step (4) of hardening the portion to a predetermined depth, and (4) the ceramic hardened layer formed in step (3) is lowered to a predetermined depth from the surface of the ceramic slurry by lowering the supporting base, and the hardened layer surface is then lowered. And a step of introducing a ceramic slurry into the ceramics. The steps (3) and (4) are repeated to sequentially laminate the hardened ceramic layers into a predetermined shape. Optical molding method of the ceramic, which comprises molding the body shape is provided.

[0007]

The present invention is constructed as described above, and a predetermined amount of a photoreactive binder and optionally a solvent are added to a ceramic powder to prepare a slurry having a relatively high fluidity. By using, it is possible to form a ceramic hardened layer by irradiating the ceramic slurry layer with light in a desired shape and hardening the slurry layer without using a molding die such as a die. Further, on the ceramic cured layer obtained by photo-curing, it is possible to repeat the formation of the ceramic slurry layer, the light irradiation, the curing, and the formation of the ceramic cured layer again to successively laminate the ceramic cured layers, without using a molding die. It is possible to obtain a ceramic molded body having a desired three-dimensional shape. Therefore, it is possible to mold a molded body having a complicated shape or the like, which cannot be molded by the conventional molding method using a mold. Also, when the molded product shrinks due to drying,
Unlike the conventional method, since there is no shrinkage failure due to the mold and it can shrink freely, it is possible to suppress the occurrence of cracks and the like. Further, at the same time that the entire molded body becomes homogeneous, a desired molded body designed in advance can be obtained, and near net molding is possible.

The present invention will be described in detail below. The ceramic powder used in the present invention is not particularly limited as long as it is stable to the solvent used for preparing the slurry. For example, various ceramics such as oxides such as alumina, zirconia and silica, carbides such as zirconium carbide, nitrides such as aluminum nitride and silicon nitride, and mixtures thereof can be used. The ceramic powder may be surface-treated with a silane compound such as an alkoxysila compound, chlorosilane, or silazane. Ceramic powder surface-treated with a silane compound is preferable because of its high dispersibility. Further, the thickness of the ceramic slurry layer that can cure the ceramic slurry layer with one light irradiation is affected by the translucency of the ceramic powder in the slurry with respect to the irradiation wavelength.
Therefore, the ceramic used is preferably a ceramic that is substantially transparent to the irradiation wavelength. For example, when ultraviolet rays are used as an irradiation light source, ceramics having an energy gap of 3.8 eV or more are preferable. Usually, alumina, zirconia, silica, aluminum nitride, silicon nitride, or a mixture thereof is used. The particle size of the ceramic powder of the present invention is 100 μm or less, preferably 50 μm or less.
This is because of the dispersion stability of the ceramic slurry.

Examples of the photo-curing, ie, photo-polymerizing and / or photo-crosslinking binder used in the present invention include:
Radical polymerization type photocurable resins such as epoxy acrylate, polyether acrylate, polyester acrylate and urethane acrylate type resins, and cationic polymerization type photocurable resins such as epoxy resins can be mentioned. The amount of the photocurable binder added is 0.5 to 50 parts by weight, preferably 3 to 30 parts by weight, based on 100 parts by weight of the ceramics. When the amount of the binder added is less than 0.5 part by weight, the shape-maintaining force of the molded body is weak and the molded body is easily broken after curing. On the other hand, when the amount of the binder exceeds 50 parts by weight, the time required for the degreasing step after molding becomes long. Further, after degreasing, the proportion of voids in the degreased body increases, and as a result, the shrinkage rate increases during sintering, making it difficult to densify, and difficult to set dimensions. In the present invention, the photo-curable binder alone has sufficient strength to maintain the shape of the molded body, but if necessary, a binder used in the molding of ordinary ceramics may be added and used in combination. it can.

As the photopolymerization initiator for causing the above-mentioned photopolymerizable binder to function, an initiator used in ordinary photopolymerization,
Examples thereof include initiators such as acetophenone type, benzoin ether type, benzyl ketal type and ketone type in radical polymerization type, and aromatic diazonium salts, aromatic sulfonium salts and the like in cationic type. The amount of the initiator added to the photopolymerizable resin is 0.5 to 20 parts by weight, preferably 1 to 10 parts by weight, based on 100 parts by weight of the binder.

The solvent constituting the ceramic slurry of the present invention may be an additive such as a photocurable binder, a polymerization initiator and a dispersant to be used, without reacting with other constituent components of the slurry and ceramic particles. Solvents that are soluble or dispersible, have low volatility and low viscosity are preferred. Examples thereof include alcohols such as n-butanol, n-pentanol and n-hexanol, and esters such as diethyl oxalate, dibutyl oxalate and 2- (2-ethoxyethoxy) ethyl acetate. A polymerizable compound, that is, a polymerizable diluent, can be used as long as it has low volatility and low viscosity. For example, ethoxydiene glycol acrylate, methoxytriethylene glycol acrylate, methoxydipropylene glycol acrylate, polyethylene glycol diacrylate having a low degree of polymerization, and 3-acryloyloxyglycerin monomethacrylate can be used. In the present invention, the content of the solvent in the ceramic slurry can be appropriately selected depending on the characteristics of the ceramic particles and the photocurable binder used in the range of 0 to 10% by weight. Generally, the viscosity of the photocurable binder is high, while the viscosity of the stereolithography slurry is preferably low. Therefore, it is preferable to add a solvent to reduce the viscosity of the slurry for improving workability. Is a ceramic powder (including a sintering aid in some cases) in Japanese Patent Application No. 5-144318.
An optical molding method was proposed by adding 10 to 200 parts by weight to 00 parts by weight to prepare a ceramic slurry having good fluidity. After that, as a result of further research on optical molding of ceramic slurry, by selecting a low-viscosity photocurable binder, no solvent was added or the amount of solvent added was 10 parts by weight with respect to 100 parts by weight of ceramic powder. Even below, the viscosity of the ceramic slurry is low, for example 1
It has been found that it can be 000 cp or less, and a slurry having relatively good fluidity can be formed. That is, the present invention has found that even with a ceramic slurry having a small solvent content, stereolithography can be performed in the same manner as in the previously proposed method. In the present invention, the necessity of addition of the dispersant can be selected depending on the kind of the binder used in the ceramic slurry. Usually, it is added in order to stably disperse the ceramic particles in the slurry for a long time. The type of dispersant has good compatibility with the binder to be used, and ordinary dispersants can be used. For example, a surfactant or the like can be used.

The present invention uses a photocurable ceramic slurry prepared by stirring and mixing the above-mentioned constituents, irradiating light into a predetermined shape to form a ceramic hardened layer, and laminating this hardened layer to obtain a desired shape. It is possible to obtain a three-dimensional shaped ceramic molded body. Molding may be carried out by forming a slurry layer for each light irradiation operation and stacking a hardened ceramic layer obtained by hardening, or by holding a predetermined amount of the ceramic slurry in a predetermined container to appropriately form a plate-shaped body. Introduce the slurry to a predetermined thickness above and irradiate the slurry on the plate with a desired shape to cure it to form a ceramic hardened layer, descend the plate and sequentially introduce the slurry onto it. It is also possible to stack the ceramic hardened layer by repeating the operation of irradiating. Various methods of irradiating the light-curable ceramic slurry with light, hardening it, forming a laminated ceramic hardened layer and molding it into a predetermined shape can be appropriately selected according to respective molding conditions.

Various kinds of light such as visible light and ultraviolet light can be used as the light for irradiating to harden the slurry to form the hardened ceramic layer, depending on the optical characteristics of the binder used. As the irradiation method, a method of using a high-pressure mercury lamp, a low-pressure mercury lamp or the like as a light source and irradiating through a mask having a predetermined shape, or a method of irradiating a predetermined surface with ultraviolet laser light or the like can be applied. Further, the intensity of irradiation light, irradiation time or scanning speed, and scanning interval are the type of ceramic powder, particle size distribution, type of photo-curable binder, concentration of ceramic slurry, and ceramic hardened layer that is hardened and formed by one irradiation. Can be appropriately selected depending on the thickness of the.

[0014]

Embodiments of the present invention will be described in more detail with reference to the drawings. However, the present invention is not limited to the following examples. FIG. 1 is a conceptual explanatory view of an apparatus for forming a ceramic by hardening and laminating a ceramic slurry of the present invention. In FIG. 1, a predetermined ceramic slurry 4 is supplied and held in a slurry container 6, and a surface of the ceramic slurry 4 is irradiated with light emitted from a light source 1 such as a mercury lamp through a mask 2 having a predetermined shape. The support base 3 is previously installed in a predetermined position in the ceramic slurry 4, and the ceramic slurry is cured on the support base 3 by light irradiation to form the ceramic cured layer 5. Ceramic slurry 4
The depth from the surface to the upper surface of the support base 3 is set in advance by the thickness of the hardened ceramic layer formed as described above, the photohardness of the ceramic slurry 4, and the irradiation time. Then, using the z-axis precision position control device (not shown), the support base 3 is used.
Is lowered to lower the ceramic hardened layer 5 formed on the support base 3 in the ceramic slurry 4 by a predetermined distance, and the surrounding ceramic slurry 4 is introduced onto the ceramic hardened layer 5. Further, if necessary, the shape of the mask 2 can be changed and light irradiation can be performed. FIG. 2 is an explanatory diagram showing a state in which the second ceramic hardened layer is formed on the first ceramic hardened layer by the second light irradiation. That is, it is the same as FIG. 1 except that the second ceramic hardened layer 7 is formed on the first ceramic hardened layer 5 in FIG. The above-described operation is repeated to photo-cure the ceramic slurry layer to form and laminate the ceramic hardened layer, thereby obtaining a three-dimensional shaped ceramic molded body. Further, in the above example, by changing the mask shape and laminating the hardened ceramic layers, it is possible to obtain a ceramic molded body having a complicated three-dimensional shape having different cross sections. It is also possible to perform molding using a commercially available stereolithography apparatus having an ultraviolet laser such as a helium-cadmium system.

Example 1 (Preparation of Solution Containing Photocurable Binder) A photocurable binder composed of commercially available aliphatic and aromatic polyfunctional acrylates containing a photopolymerization initiator (manufactured by San Nopco, trade name SN). -5X
-1641) 194 g, and 6 g of polyoxyethylene sorbitan monostearate as a dispersant were added and mixed.

(Preparation of Ceramic Slurry) 300 g of silica (SiO ₂ ) powder treated with γ-methacryloxypropyltrimethoxysilane having an average particle size of 1.0 μm,
The mixture was added to the photocurable binder containing the dispersant prepared as described above, and the mixture was stirred and mixed at room temperature for 24 hours using a nylon ball and a light-shielded polyethylene pot. The obtained ceramic slurry was transferred to a container and defoamed under reduced pressure. The viscosity of the obtained slurry was 90 when measured with a B-type viscometer.
It was 4 cp.

(Photocuring lamination molding of ceramics slurry)
To the slurry container 6 having the same device as that shown in FIG. 1, 150 g of the defoamed ceramic slurry obtained above was added,
The support base 3 is set at a position of 500 μm below the surface of the ceramic slurry, the 100 W high-pressure mercury lamp 1 is set at a position of 150 mm from the slurry surface, and an annular transmission having an inner diameter of 10 mm and an outer diameter of 20 mm is provided on a quartz plate having a thickness of 1 mm. Ultraviolet irradiation was performed through the mask 2 having a surface. Irradiation is 30
After cutting the irradiation light for 2 seconds, the support 3 is moved by moving means.
Lowering the ceramic hardened layer 5 formed on the support base 3.
Was lowered by 500 μm, and at the same time, the slurry was introduced onto the hardened layer, and the ultraviolet ray was irradiated again for 30 seconds in the same manner to form and laminate the ceramic hardened layer 7 on the ceramic hardened layer 5 to cut light. Thereafter, the support base 3 was further lowered by 500 μm, the ceramic hardened layer 7 was further lowered by 500 μm, and ultraviolet rays were irradiated again. The above operation was continuously repeated 40 times. A cylindrical shaped body was taken out from the ceramic slurry, the obtained shaped body was washed with ethanol to remove the uncured slurry, and then dried in an air atmosphere for 2 days. Then, it is dried under reduced pressure at 30 ° C. for 5 hours, and the inner diameter is about 9 mm and the outer diameter is about 1
A cylindrical silica molded body having a length of 6 mm and a length of about 19 mm was obtained. As a result of measuring the bulk density of the obtained silica molded body,
It was 1.4 g / cm ³ .

(Sintering) The silica molded body obtained as described above was heated and degreased in an air atmosphere to 600 ° C. for 20 hours, and thereafter heated and heated at a temperature rising rate of 300 to 400 ° C./hour. It was heated and held at 1400 ° C. for 3 hours for sintering. The bulk density of the obtained sintered body was 2.2 g / cm ³ .

Example 2 (Preparation of Solution Containing Photocurable Binder) Photocurable binder composed of commercially available aliphatic and aromatic polyfunctional acrylates containing a photopolymerization initiator (manufactured by San Nopco, trade name SN). -5X
-1641) 194 g, polyoxyethylene sorbitan monostearate 2 g as a dispersant and ethoxydiethylene glycol acrylate 20 g as a solvent (5 parts by weight to 100 parts by weight of added silica) were added and mixed.

(Preparation of Ceramic Slurry) 400 g of the same silica (SiO ₂ ) powder as in Example 1 was added to the solution containing the photocurable binder prepared as described above, and a nylon ball and light-shielded polyethylene were added. The mixture was stirred and mixed at room temperature for 24 hours using a pot. The obtained ceramic slurry was transferred to a container and defoamed under reduced pressure. The viscosity of the obtained slurry was 804 cp when measured in the same manner as in Example 1.

(Photocuring lamination molding of ceramic slurry)
150 g of the ceramic slurry obtained as described above was added to the stereolithography apparatus in the same manner as in Example 1, and using the same mask as in Example 1, photocuring was performed under the conditions of a stacking interval of 500 μm and an irradiation time of 30 seconds. Layered twice. A cylindrical shaped body was taken out from the ceramic slurry, the obtained shaped body was washed with ethanol to remove the uncured slurry, and then dried in an air atmosphere for 2 days. Then, under reduced pressure, at 30 ℃ 5
Dry for an hour, inner diameter approx. 9 mm, outer diameter approx. 16 mm, length approx. 1
A 9 mm cylindrical rod-shaped silica molded body was obtained. As a result of measuring the bulk density of the obtained silica molded body, it was 1.5 g / cm ³ .

(Sintering) The silica molded body obtained as described above was sintered in the same manner as in Example 1 to obtain a bulk density of 2.2 g /
A sintered body of cm ³ was obtained.

Example 3 194 g of photocurable binder and dispersant 8 as in Example 1.
To g, 32 g of 2- (2-ethoxyethoxy) ethyl acetate as a solvent (8 parts by weight based on 100 parts by weight of silica powder) was added to prepare a solution containing a photocurable binder. To this solution, 400 g of the same silica powder as in Example 1 was added, and stirred in the same manner as in Example 1 using a pot mill for 24 hours to prepare a ceramic slurry. The viscosity of the obtained slurry was 780 cp as measured in the same manner as in Example 1. 150 g of this slurry was sampled and photocured in the same manner as in Example 1 to obtain a cylindrical silica molded body having an inner diameter of about 9 mm, an outer diameter of about 16 mm and a length of about 19 mm. As a result of measuring the bulk density of the obtained silica molded body, it was 1.5 g / cm ³ . Further, the molded body is sintered in the same manner as in Example 1,
A sintered body having a bulk density of 2.1 g / cm ³ was obtained.

Example 4 194 g of photocurable binder and dispersant 6 as in Example 1.
20 g of ethoxydiethylene glycol acrylate as a solvent (5 parts by weight to 100 parts by weight of silica powder) was added to g to prepare a solution containing a photocurable binder. To this solution, 300 g of the same silica powder as in Example 1 was added, and stirred in the same manner as in Example 1 using a pot mill for 24 hours to prepare a ceramic slurry. The viscosity of the obtained slurry was 440 cp when measured in the same manner as in Example 1. A rectangular column having a length of 10 mm and a length of 50 mm was formed from the slurry thus obtained using an optical modeling apparatus equipped with a helium-cadmium laser light source (laser power: 6 mW). Stereolithography conditions: scanning speed 3 mm / min, stacking interval 0.2 mm, exposure amount per unit area 13.3 m
It was W · s / mm ² . As a result of measuring the bulk density of the obtained molded body, it was 1.4 g / cm ³ . Further, the molded body was sintered in the same manner as in Example 1 to obtain a sintered body having a bulk density of 2.1 g / cm ³ .

Example 5 194 g of photocurable binder and dispersant 8 as in Example 1
To g, 32 g of ethoxydiethylene glycol acrylate (8 parts by weight based on 100 parts by weight of silica powder) was added as a solvent to prepare a solution containing a photocurable binder. To this solution, 400 g of the same silica powder as in Example 1 was added, and stirred in the same manner as in Example 1 using a pot mill for 24 hours to prepare a ceramic slurry. The viscosity of the obtained slurry was 510 cp when measured in the same manner as in Example 1. A prism having a length of 10 mm, a width of 10 mm, and a length of 50 mm was formed in the same manner as in Example 4 except that the slurry prepared above was used. As a result of measuring the bulk density of the obtained molded body,
It was 1.5 g / cm ³ . Further, the molded body was sintered in the same manner as in Example 1 to obtain a sintered body having a bulk density of 2.2 g / cm ³ .

Example 6 194 g of photocurable binder and dispersant 8 as in Example 1
32 g of ethoxydiethylene glycol acrylate as a solvent (8 parts by weight to 100 parts by weight of alumina powder) was added to g to prepare a solution containing a photocurable binder. This solution was treated with γ-methacryloxypropyltrimethoxysilane in the same manner as in Example 1, and α having an average particle size of 1.5 μm was used.
-Alumina powder (400 g) was added and stirred for 24 hours using a pot mill in the same manner as in Example 1 to prepare a ceramic slurry. The viscosity of the obtained slurry was 900 cp when measured in the same manner as in Example 1. 1 from this slurry
Samples of 50 g were taken and the same device as used in Example 1 was used to obtain a thickness of 1
Ultraviolet irradiation was performed through a mask (2) having a circular transparent surface with an inner diameter of 15 mm, which was produced on a quartz plate of mm. Irradiation time 40 seconds, lamination interval 250 μm 4
By stacking 0 times, a cylindrical molded body having a diameter of about 16 mm and a height of about 10 mm was obtained. As a result of measuring the bulk density of the obtained alumina molded body, it was 1.9 g / cm ³ . The dry molded body was heated and degreased to 600 ° C. in an air atmosphere for 20 hours, and thereafter heated at a heating rate of 100 ° C./hour to 1600 ° C.
And sintered for 2 hours. As a result of measuring the bulk density of the obtained sintered body, 3.5 g / cm ³ (relative density 87.70) was obtained.
%)Met.

[0027]

INDUSTRIAL APPLICABILITY The present invention prepares a ceramic powder and a photo-curing binder, or a ceramic slurry containing the ceramic powder, a photo-curing binder and a solvent to a predetermined viscosity, and A specific surface of the ceramic slurry is irradiated with light to continuously cure the slurry to form a ceramic cured layer, and a cured layer having a cross section of a specific shape cured by light irradiation is laminated to form a continuous body. Is a method of molding ceramic particles into a three-dimensional shape. Therefore, post-processing such as polishing and grinding is not required, which simplifies the work. Further, as a matter of course, since no mold is required, it is not necessary to manufacture a mold for each specific molded body, and therefore the time and cost required for mold manufacture can be reduced, which is extremely useful industrially. The effects of the present invention can be summarized as follows. (1) Since it is not necessary to use a mold for absorbing water and a solvent such as a plaster mold, there is no restriction on the mold at the time of molding, and it is possible to mold a complicated shape easily and easily. (2) Molding as designed in advance is possible, and near net molding is possible. (3) Since there is no need for post-processing after molding, the raw material ceramic powder and the like can be reduced. (4) Since molds such as molds and gypsum are not required, mold manufacturing time is not required, and a predetermined shape can be molded in a short time, and mold manufacturing cost can be reduced. Moreover, it does not require excessive work for handling large molds, plaster molds, and the like.

[Brief description of drawings]

FIG. 1 is a conceptual explanatory view of an apparatus for forming a ceramic by hardening and laminating a ceramic slurry of the present invention.

FIG. 2 is an explanatory view showing a state in which a second ceramic hardened layer is formed on the first ceramic hardened layer.

[Explanation of symbols]

 1 Light Source 2 Irradiation Mask 3 Support 4 Slurry 5 Ceramic Hardened Layer (First) 6 Slurry Container 7 Ceramic Hardened Layer (Second)

Claims (3)

[Claims] 1. (a) 100 parts by weight of ceramic powder,
Photocurable binder 0.5 to 50 parts by weight and solvent 0
A step of preparing a slurry containing 10 to 10 parts by weight,
(B) a step of forming a ceramic slurry layer having a predetermined thickness using the slurry and irradiating with light to cure the slurry layer to obtain a ceramic hardened layer; and (c) the step obtained in the step (b). The ceramic hardened layer has a step of continuously repeating the same operation as the step (b) a predetermined number of times, and the ceramic hardened layer is sequentially laminated in a predetermined shape to form a three-dimensional ceramic body. An optical molding method for ceramics, characterized by: 2. The optical molding method for ceramics according to claim 1, wherein the ceramic powder is substantially transparent to a light irradiation wavelength. 3. (1) 100 parts by weight of ceramic powder,
Photocurable binder 0.5 to 50 parts by weight and solvent 0
A step of holding a ceramic slurry containing 10 to 10 parts by weight in a container, (2) a step of setting a support table at a predetermined depth from the surface of the ceramic slurry in the ceramic slurry, (3) the container The step of irradiating the surface of the ceramic slurry in a predetermined shape with light to cure a part of the surface of the slurry to a predetermined depth, and (4) descending the ceramic hardened layer formed in step (3) from the support base. The step of lowering the surface of the ceramic slurry to a predetermined depth and introducing the ceramic slurry onto the surface of the hardened layer is performed, and the steps (3) and (4) are repeated to form the hardened ceramic layer into a predetermined shape. An optical molding method for ceramics, characterized in that the three-dimensionally shaped ceramics body is formed by sequentially laminating.