JPH10130061A - Production of ceramic - Google Patents

Abstract

PROBLEM TO BE SOLVED: To efficiently produce a high density and high strength satisfactory sintered body free from defects such as a crack by hardening a ceramic slurry contg. ceramic powder and a photoreactive resin by photosetting. SOLUTION: A ceramic slurry contg. a photopolymerizable and/or photocross- linkable resin and ceramic powder consisting of 80-99 pts.wt. ceramic particles of 0.1-100μm average particle diameter and 1-20 pts.wt. fine ceramic particles of <0.1μm average particle diameter is hardened by irradiation with light and the resultant formed body is sintered to produce the objective ceramic. A metal- contg. org. compd. as a precursor of the ceramic may be incorporated as part or all of the fine ceramic particles. A cubic body may be obtd. by laminating plural flat hardened layers each having a prescribed shape formed by irradiating the ceramic slurry with light.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing ceramics, and more particularly, to a method for producing ceramics exhibiting excellent properties such as heat resistance, chemical resistance, and oxidation resistance. With regard to
More specifically, the present invention relates to a method for producing a ceramic, which comprises irradiating a ceramic slurry containing a photopolymerization and / or photocrosslinking reactive resin and a ceramic powder with light and curing the same to form a ceramic into a predetermined shape and sintering the ceramic.

[0002]

2. Description of the Related Art A process for producing ceramics includes a process for forming ceramic powder which has an important effect on the characteristics of a sintered body. 2. Description of the Related Art Conventionally, as a method of forming a three-dimensional ceramic body using a ceramic powder, a method of using a mold having a predetermined shape is generally used. For example, dry pressure molding of a dry powder using a mold, slip cast molding of a slurry containing a powder using a water-absorbent mold such as a gypsum mold, filling a specific mold with a reactive slurry, polymerization, crosslinking, and aggregation. A gel molding method for solidifying and molding by such a reaction has been known. Since all of these methods use a mold, not only costs and time for manufacturing the mold are required, but also the use of the mold naturally limits the molding shape, and it is difficult to mold a complex-shaped product. In order to solve such problems in the ceramics molding process, the applicant has previously disclosed in Japanese Patent Application Laid-Open No. Hei 6-329460 the bonding of a photopolymerization and / or photocrosslinking reactive resin used in the plastics molding field. A method for forming ceramics used as an agent was proposed.

[0003]

The above-mentioned proposed method is an excellent molding method capable of obtaining a ceramic molded body having a complicated shape without using a molding die. However, as a result of further study on this method, it was found that cracks may occur in the sintering step, and that if the sintering is performed with the cracks occurring, the strength of the sintered body is low and cannot be used depending on the purpose of use. Was done. Based on these findings, the inventors reviewed the above-mentioned ceramic forming method and reexamined it to prevent the occurrence of cracks in the sintering process. As a result, two types of ceramic powder having different particle diameters were used as the ceramic powder in the slurry. Were found to be able to prevent the occurrence of cracks by coexisting at a predetermined ratio, and completed the present invention.

[0004]

According to the present invention, a photopolymerization and / or photocrosslinking reactive resin, and a resin having an average particle size of 0.1.
80 to 99 parts by weight of ceramic particles of 1 to 100 μm and ceramic fine particles 1 to 20 having an average particle size of less than 0.1 μm
The present invention provides a method for producing ceramics, which comprises irradiating a ceramic slurry containing a ceramic powder consisting of parts by weight with light to cure it into a molded body and then sintering the molded body. In the method for producing a ceramic of the present invention, the ceramic particles and the ceramic fine particles are preferably the same type of ceramic,
Further, as a part or all of the ceramic fine particles, a metal-containing organic compound which is a ceramic precursor can be contained. In addition, the ceramic slurry can be irradiated with light to form a plate-shaped cured layer having a predetermined shape, and a plurality of the plate-shaped cured layers can be laminated to obtain a three-dimensionally shaped molded body.

The present invention mainly comprises a photopolymerization and / or photocrosslinking reactive resin, and ceramic particles having an average particle diameter of at least two types within a predetermined range and having a large particle diameter. Since the ceramic slurry containing the ceramic powder as a component is used as a starting material, it is possible to form a molded body of a predetermined shape by irradiating light without using a molding die such as a mold, and at the same time, form the molded body obtained. Cracks in the sintering process can be prevented. The reason why this crack can be prevented is not clear, but since small ceramic fine particles coexist, ceramic fine particles with a small particle size enter the gap between the ceramic particles with a large particle size, and the ceramic particles are tightly bonded. Can be estimated. In addition, when a metal-containing organic compound of a ceramic precursor is added instead of ceramic fine particles having a small average particle diameter, the ceramics that form the final sintered body without increasing the solid ceramic fine powder Since the amount can be increased, an increase in slurry viscosity can be suppressed, and low workability in handling a high viscosity slurry can be avoided. At the same time, since the metal-containing organic compound is converted into fine-grained ceramic during sintering,
It is thought that the ceramic particles can be more effectively tightly bonded, and the occurrence of cracks can be prevented.
As described above, in the present invention, cracks can be prevented from occurring in the sintering step of the molded body, and since the ceramic particles are tightly coupled, the obtained sintered body is homogeneous, high-density, High strength.

[0006]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, the present invention will be described in detail. The ceramic powder used in the present invention is not particularly limited as long as it is stable to the photoreactive resin and 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. In addition, the thickness of the ceramic slurry layer that can harden the ceramic slurry layer by one light irradiation is affected by the light transmittance 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 light is used as the irradiation light source, a ceramic whose energy gap is 3.8 eV or more is preferable. Normal,
Alumina, zirconia, silica, aluminum nitride, silicon nitride, a mixture thereof, or the like is used.

The ceramic powder used in the present invention has an average particle diameter of 100 μm or less, and is used in combination with at least two kinds of particles having an average particle diameter. That is, a ceramic slurry particle having a large average particle diameter of 0.1 to 100 μm, preferably 0.5 to 50 μm, and a ceramic having a small average particle diameter of less than 0.1 μm, and preferably 0.05 μm or less in a ceramic slurry. Coexist with fine particles. The reason why the average particle size of the ceramic powder is set to 100 μm or less is because of the dispersion stability of the ceramic slurry. The reason why the average particle size of large and small is divided by 0.1 μm is that when the main ceramic particle size is less than 0.1 μm, the viscosity of the slurry is significantly increased. Furthermore,
In the total amount of the ceramic powder in the ceramic slurry, 80 to 99% by weight of ceramic particles having a large average particle size and 1 to 20% by weight of ceramic fine particles having a small average particle size are coexisted. Ceramic powder with a small average particle size
If the content is less than 20% by weight, the effect of preventing the occurrence of cracks by coexisting two kinds of ceramic powders, large and small, is not sufficient.
When the content is more than 0% by weight, the viscosity of the slurry is undesirably high. Furthermore, the above average particle size 2
When various kinds of ceramic powders coexist, large and small ceramic powders may be the same or different.
Usually, the same one is used.

In the present invention, among the above-mentioned ceramic powders having a large or small average particle diameter, a metal-containing organic compound of a ceramic precursor which is converted into ceramics by heat treatment is used as a part or all of the ceramic fine particles having a small average particle diameter. Instead of part or all of the ceramic fine particles in the ceramic slurry, a metal-containing organic compound which is expected to be converted into a ceramic corresponding to the amount can be contained. For this reason, even when it is desired to finally increase the amount of ceramics constituting the sintered body, the viscosity of the ceramic slurry is more than necessary because the metal-containing organic compound is used to turn the ceramics into a metal oxide during sintering. The ceramic slurry can be easily handled. For example, when the ceramic powder is added to the slurry, the viscosity of the slurry increases, so that it is possible to prevent the inconvenience that the ceramic slurry is difficult to be introduced and the molding is not easy.

As the metal-containing organic compound used in the present invention, organic compounds such as silicon, aluminum and titanium which form oxides such as silica, alumina and titania by thermal conversion, ie, organometallic compounds, organometallic complexes and the like It is. For example, γ-methacryloxypropyltrimethoxysilane, γ-methacryloxypropylmethyldimethoxysilane, γ-glycidoxypropyltrimethoxysilane, γ-glycidoxypropylmethyldimethoxysilane, β-3,4-epoxycyclohexylethyltrimethoxysilane Examples include methoxysilane, aluminum tributoxide, acetoalkoxyaluminum diisopropylate, titanium tetrabutoxide and the like. Among these, it is compatible with the photopolymerizable and / or photocrosslinkable resin and the polymerizable diluent described below, and is photopolymerizable and / or
Or those having the same reactive functional group as the photocrosslinking reactive resin, and those which are polymerized and cured at the time of light irradiation for molding are particularly preferable,
γ-methacryloxypropyltrimethoxysilane and γ-
Glycidoxypropyltrimethoxysilane is preferably used. The amount of these metal-containing organic compounds to be added is selected depending on the conversion rate to ceramics, but is usually 1 to 1 of the total amount of ceramic powder in the ceramic slurry in terms of the amount of ceramics formed by converting the metal-containing organic compounds. 2
The amount of the metal-containing organic compound is calculated and added so as to be 0% by weight, preferably 2 to 10% by weight. When the amount is small, the effect of addition is small, while when the amount is large, the amount of solid ceramic powder in the ceramic slurry containing the photopolymerizable and / or photocrosslinkable resin, the ceramic powder, and the metal-containing organic compound is reduced. Therefore, the shrinkage during sintering increases, which is not preferable.

The photocurable, ie, photopolymerizable and / or photocrosslinkable, reactive resin used in the present invention includes, for example, radical polymerization of epoxy acrylate, polyether acrylate, polyester acrylate, urethane acrylate resin and the like. Examples include cationic photocurable resins such as mold photocurable resins and epoxy resins, and can be composed of respective monomers and polyfunctional oligomers. In the present invention, the addition amount of the photopolymerization and / or photocrosslinking reactive resin is in the range of 1 to 100 parts by weight, preferably 5 to 50 parts by weight, based on 100 parts by weight of the ceramic. When the addition amount of the photopolymerization and / or photocrosslinking reactive resin is less than 1 part by weight, the molded article has a weak shape retention force after curing and the molded article is easily broken. On the other hand, photopolymerization and / or
Alternatively, if the amount of the photo-crosslinking reactive resin is more than 100 parts by weight, the time in the degreasing step after molding is undesirably long. In addition, after degreasing, the ratio of voids in the degreased body increases, resulting in an increase in shrinkage during sintering, which makes it difficult to achieve densification and difficulties in setting dimensions.

In the present invention, the above-mentioned photopolymerization and / or photocrosslinking reactive resin alone has sufficient strength to maintain the form of the molded article, but if necessary, it can be used for ordinary ceramic molding. Can be added and used together. Examples of the photopolymerization initiator for causing the photopolymerization and / or photocrosslinking reactive resin to function include initiators used in ordinary photopolymerization, such as acetophenone, benzoin ether, and benzyl ketal in radical polymerization. And ketone-based initiators, and in the case of cationic systems, initiators such as aromatic diazonium salts and aromatic sulfonium salts. The amount of the initiator added to the photopolymerization and / or photocrosslinking reactive resin is 0.5 to 20 parts by weight, preferably 2 to 15 parts by weight, based on 100 parts by weight of the photopolymerization and / or photocrosslinking reactive resin. is there. In the present invention, the necessity of adding a dispersant can be selected depending on the type of the photopolymerization and / or photocrosslinking reactive resin used. Usually, ceramic powder particles are added to the ceramic slurry to stably disperse them for a long time. The type of the dispersant is one having good compatibility with the photopolymerization and / or photocrosslinking reactive resin to be used, and a usual dispersant can be used. For example, a surfactant or the like can be used.

In the present invention, a solvent (diluent) is added to a ceramic slurry containing the above-mentioned ceramic powder and the photopolymerization and / or photocrosslinking reactive resin in order to adjust the viscosity of the slurry. Can be. The solvent used is such that additives such as a photocurable photopolymerization and / or photocrosslinking reactive resin, a polymerization initiator and a dispersant are soluble without reacting with other components of the slurry and the ceramic particles. Preferred are those that are present or dispersible, have low volatility and low viscosity. For example, alcohols such as n-butanol, n-pentanol and n-hexanol, diethyl oxalate, dibutyl oxalate, 2- (2-ethoxyethoxy) ethyl acetate,
And the like. In addition, a polymerizable compound, that is, a polymerizable diluent can be used as long as it has low volatility and low viscosity. For example, ethoxydiethylene glycol acrylate, methoxytriethylene glycol acrylate, methoxydipropylene glycol acrylate, diacrylate of polyethylene glycol having a low degree of polymerization, 3-acryloyloxyglycerin monomethacrylate, resorcin diglycidyl ether,
Neopentyl glycol diglycidyl ether, 1,6
-Hexadiol diglycidyl ether and the like can be used. The content of the solvent in the ceramic slurry of the present invention can be appropriately selected depending on the type and amount of the ceramic powder to be used, the characteristics of the photopolymerization and / or photocrosslinking reactive resin, and the like.

In the present invention, a ceramic molded body can be formed by irradiating a photo-curable ceramic slurry prepared by stirring and mixing each of the above-mentioned components into a predetermined shape and irradiating it with light. Alternatively, the ceramic slurry may be cured by irradiating the plate with light to form a plate-shaped cured layer, and the plate-shaped cured layer may be laminated to obtain a desired three-dimensionally shaped ceramic molded body. Lamination molding may be performed by forming a slurry layer for each light irradiation operation, laminating a ceramic cured layer obtained by curing by light irradiation, or holding a predetermined amount of ceramic slurry in a predetermined container, After forming the plate-shaped cured product, an operation of appropriately introducing a slurry to a predetermined thickness on the plate-shaped cured product, irradiating the slurry on the plate-shaped cured product in a desired shape with light, and curing to form a ceramic cured layer is performed. That is,
The formed flat hardened body is sequentially lowered, slurry is introduced,
The operation of light irradiation and curing can be repeated to laminate a ceramic cured layer.

Various lights such as visible light and ultraviolet light are used as light for irradiating the ceramic slurry to form a hardened ceramic layer, depending on the optical characteristics of the photopolymerization and / or photocrosslinking reactive resin used. be able to. As an irradiation method, a high-pressure mercury lamp, a low-pressure mercury lamp or the like is used as a light source, and irradiation is performed through a mask having a predetermined shape.
A method of irradiating a predetermined surface with an ultraviolet laser beam or the like can be applied. In addition, the intensity of irradiation light, irradiation time, scanning speed and scanning interval are determined by the type of ceramic powder, particle size distribution,
It can be appropriately selected depending on the type of the photopolymerization and / or photocrosslinking reactive resin, the concentration of the ceramic slurry, and the like.

[0015]

EXAMPLES The present invention will be described in more detail with reference to examples. However, the present invention is not limited to the following examples. First, a silane compound is selected as a metal-containing organic compound to be formed into a ceramic by a heat treatment for forming ceramic fine particles with the ceramic powder of the present invention. The conversion rate was checked. (Ceramic conversion test by thermal conversion of metal-containing organic compound-1) Commercially available photo-curable resin containing aliphatic and aromatic polyfunctional acrylates containing a photopolymerization initiator (trade name: SN-5X-1641, manufactured by San Nopco) ) To a solution consisting of 80 g and 26.7 g of ethoxydiethylene glycol acrylate, 26.7 g of γ-methacryloxypropyltrimethoxysilane was added and uniformly stirred and mixed. 2.76 g of the obtained mixed solution was collected and dropped on a quartz glass plate to form a thin layer. The thin layer was irradiated with light using a high-pressure mercury lamp (irradiation intensity: 145 mW / cm ² ) to obtain a cured thin layer. Although the cured thin layer was slightly liquid, it became a cured product. The obtained cured product was heated in an air atmosphere to 900 ° C. over about 10 hours, and then heat-treated at 900 ° C. for 3 hours. Thereafter, the mixture was allowed to cool to room temperature to obtain a white powdery substance. The obtained white powdery substance was 0.64 g and γ-
This corresponds to about 96% of the case where silicon constituting methacryloxypropyltrimethoxysilane is completely converted to SiO ₂ . Elemental analysis of the white powder by EPMA (electron beam microanalyzer) confirmed that the powder was SiO ₂ .

(Ceramic conversion test by thermal conversion of metal-containing organic compound-2) 80 g of a commercially available epoxy-based UV-curable resin containing an onium salt-type UV-based polymerization initiator and neopentyl glycol diglycidyl ether
To a solution consisting of 7 g, 26.7 g of γ-glycidoxypropyltrimethoxysilane was added and uniformly stirred and mixed. 1.66 g of the obtained solution was subjected to a ceramic conversion test.
UV irradiation and heat treatment in the same manner as in Example 1.
39 g were obtained. This corresponds to about 92.4% of the case where silicon constituting γ-glycidoxypropyltrimethoxysilane is completely converted to SiO ₂ . Further, it was confirmed that the white powder was SiO ₂ in the same manner as in the ceramicization test-1.

As is clear from the above-mentioned ceramic conversion tests-1 and 2, a silane compound is added to a photopolymerization and / or photocrosslinking reactive resin, and cured by light irradiation, followed by heat treatment. It can be seen that it can be converted to SiO ₂ .

Example 1 168 g of a photocurable resin (manufactured by San Nopco, trade name SN-5X-1641) comprising a commercially available aliphatic and aromatic polyfunctional acrylate containing a photopolymerization initiator and 112 g of a diluent ethoxydiethylene glycol acrylate to a solution consisting of, SiO ₂ particles having an average particle size of 1.0μm as the ceramic powder 280g and an average particle size 16nm of SiO ₂
Fine particles (10.2 g) were added, 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 particle-dispersed slurry was transferred to a container and defoamed under reduced pressure to prepare a slurry. The viscosity of the obtained slurry was measured at 25 ° C. using a B-type viscometer.
cp. Using a stereolithography machine equipped with a helium-cadmium laser light source (laser power: 6 mW), the slurry prepared above at a scanning speed of 3 mm / sec and a stacking interval of 0.2 mm was 20 mm in width, 30 mm in length and 30 mm in thickness. A 5 mm flat plate block was formed. The obtained plate block molded body was heated to 300 ° C. over 3 hours in an air atmosphere, kept at 300 ° C. for 3 hours, and then heated to 1400 ° C. over 10 hours and sintered. The obtained sintered body was porous, had a bulk density of 1.29 g / cm ³ , and had neither cracks nor peeling. It was also confirmed that the bending strength was relatively large.

Example 2 A solution comprising 144 g of the photocurable resin (manufactured by San Nopco, trade name SN-5X-1641) and 48 g of a diluent ethoxyethylene glycol acrylate used in Example 1 was used as a ceramic powder to obtain an average particle size of 1%. 0.0 μm Si
280 g of O ₂ particles and 48 g of γ-methacryloxypropyltrimethoxysilane (11.6 g in terms of SiO ₂ ) were added, and a slurry was prepared in the same manner as in Example 1. As a result of measuring the viscosity of the obtained slurry in the same manner as in Example 1, it was 170 cp. The obtained slurry was irradiated with an ultraviolet laser in the same manner as in Example 1, and the width was 20 m in the same manner.
After forming a flat plate block having a length of m, a length of 30 mm and a thickness of 5 mm, it was similarly sintered to obtain a sintered body. The obtained sintered body was free of cracks and peeling, was porous, had a bulk density of 1.82 g / cm ³ , and had relatively high flexural strength.

Example 3 A solution comprising 144 g of an epoxy ultraviolet curable resin containing an onium salt type polymerization initiator and 48 g of neopentyl glycol diglycidyl ether containing a polymerization initiator of the onium salt type used in the ceramicization test-2 was used as a ceramic powder to have an average particle size of 1%. 0.0μ
240 g of m ₂ SiO ₂ particles and 48 g of γ-glycidoxypropyltrimethoxysilane (12.2% in terms of SiO _2).
g) was added, and a slurry was prepared in the same manner as in Example 1. The viscosity measured in the same manner as in Example 1 was 294 cp. The obtained slurry was irradiated with an ultraviolet laser in the same manner as in Example 1, and the width was 20 mm, the length was 30 mm, and the thickness was 5 m.
m flat plate blocks were formed. Temperature rise as in Example 1,
The sintered body was obtained by sintering. The resulting sintered body was porous without any cracking or peeling, and had a bulk density of 1.92 g / cm.
³ , and the bending strength was relatively large.

Example 4 A solution composed of 144 g of the photocurable resin (manufactured by San Nopco, trade name SN-5X-1641) and 48 g of a diluent ethoxyethylene glycol acrylate used in Example 1 was mixed with calcium carbonate 53. 6g
(30 g as calcium oxide), average particle size 1.2 μm
Aluminum oxide 60 g, average particle size 1.0 μm Si
200 g of O ₂ particles and 48 g of γ-methacryloxypropyltrimethoxysilane (11.6 g in terms of SiO ₂ ) were added, and a slurry was prepared in the same manner as in Example 1. As a result of measuring the viscosity of the obtained slurry in the same manner as in Example 1, it was 876 cp. The obtained slurry was irradiated with an ultraviolet laser in the same manner as in Example 1, and the width was 20 mm in the same manner.
A flat plate block having a length of 30 mm and a thickness of 5 mm was formed.
The flat plate block obtained is placed in an air atmosphere for 300 minutes.
The temperature was raised to 300 ° C. over 3 hours and maintained at 300 ° C. for 3 hours, and then the temperature was raised to 1300 ° C. over 10 hours to sinter. The obtained sintered body is porous and has a bulk density of 1.52 g /
cm ³ , and no cracking or peeling occurred. It was also confirmed that the bending strength was high.

Comparative Example 1 A slurry was prepared in the same manner as in Example 1 except that fine particles of SiO ₂ having an average particle diameter of 16 nm were not added. As a result of measuring the viscosity of the obtained slurry in the same manner as in Example 1, 15
It was 0 cp. The obtained slurry was irradiated with an ultraviolet laser in the same manner as in Example 1, and the width was 20 mm and the length was 30 in the same manner.
A flat block having a thickness of 5 mm and a thickness of 5 mm was formed. The obtained flat plate block was heated and sintered in the same manner as in Example 1 to obtain a sintered body. The obtained sintered body was porous and had a bulk density of 1.70 g / cm ³ , a large number of cracks were observed, and it was confirmed that the sintered body was extremely brittle with some missing parts.

Comparative Example 2 The diluent ethoxydiethylene glycol acrylate was added to 9
A slurry was prepared in the same manner as in Example 4 except that 6 g of SiO ₂ particles having an average particle diameter of 1.0 μm was 210 g and γ-methacryloxypropyltrimethoxysilane was not added. The viscosity of the obtained slurry measured in the same manner as in Example 1 was 724 cp. The obtained slurry was irradiated with an ultraviolet laser in the same manner as in Example 1, and the width was 20 m in the same manner.
m, a flat plate block having a length of 30 mm and a thickness of 5 mm were formed. The obtained flat plate block was heated and sintered in the same manner as in Example 4 to obtain a sintered body. The obtained sintered body is
It was porous and had a bulk density of 1.42 g / cm ³ , and generation and peeling of many cracks were observed.

Table 1 shows the above examples and comparative examples.
Are shown together. In the table, in the quality evaluation column,
High strength, high bulk density, good sintered body without defects such as cracks was obtained. On the other hand, ×, defects such as cracks occurred in the obtained sintered body, and the present invention 5 shows that the strength and the bulk density are lower than those of Examples of the present invention. As is clear from the examples and comparative examples, the photopolymerization and / or Alternatively, the ceramic slurry prepared together with the photocrosslinking reactive resin is cured and molded by irradiation with light using the ceramic slurry to form a molded body, and the sintered body obtained by sintering has cracks generated in the sintering process. It can be seen that there is no high density and high strength. On the other hand, it can be seen that a sintered body obtained from a ceramic slurry in which only ceramic particles having a large average particle size are dispersed has cracks generated in the sintering step, and has a reduced density and is brittle. Further, it can be seen that a similar effect can be obtained without increasing the viscosity of the slurry by using a metal-containing organic compound that can be converted into the ceramic by heat treatment instead of the ceramic particles.

[0025]

[Table 1]

[0026]

The present invention uses a combination of ceramic particles and fine particles having predetermined particle diameters different in size from each other as a ceramic powder, and a photocurable and / or photocrosslinkable reactive resin, and if necessary, a photocurable resin together with a solvent. Forming a ceramic slurry, irradiating light from the ceramic slurry to obtain a molded body by curing molding or laminating a cured layer, and further sintering to obtain a sintered body. Cracks can be prevented, and high-strength ceramics can be obtained. Also, when the amount of ceramic fine powder in the slurry is increased, the viscosity of the slurry increases.For example, when the ceramic slurry is light-cured and a ceramic cured layer is sequentially laminated and formed, if the viscosity of the ceramic slurry becomes too high, The introduction of the slurry on the hardened layer becomes difficult, and handling becomes difficult.However, by using a metal-containing organic compound, it becomes ceramic as a metal oxide during sintering. Without this, a homogeneous, dense, high-density, high-strength sintered ceramic can be produced.

Claims (4)

[Claims] 1. A photopolymerization and / or photocrosslinking reactive resin,
Light irradiation is performed on a ceramic slurry containing a ceramic powder composed of 80 to 99 parts by weight of ceramic particles having an average particle diameter of 0.1 to 100 μm and 1 to 20 parts by weight of ceramic fine particles having an average particle diameter of less than 0.1 μm. And then hardening to form a molded body, and then sintering the molded body. 2. The method according to claim 1, wherein the ceramic particles and the ceramic fine particles are the same type of ceramic. 3. The method for producing a ceramic according to claim 1, wherein a metal-containing organic compound as a ceramic precursor is contained as a part or all of the ceramic fine particles. 4. The molded body is a three-dimensional body formed by irradiating the ceramic slurry with light to form a plate-shaped cured layer of a predetermined shape and laminating a plurality of the plate-shaped cured layers. 4. The method for producing a ceramic according to item 2 or 3.