JPS58153604A - Manufacture of ceramic shape - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical field to which the invention pertains] The present invention relates to a method for manufacturing a ceramic molded body, which manufactures a ceramic molded body before firing.

[Description of prior art]

Conventional manufacturing methods for ceramic molded bodies, with the exception of some manufacturing methods such as glass products that are molded in a warm molten state, use an inorganic solid material as a starting material and mechanically crush, classify, mix, etc. The raw material preparation process involves preparing a raw material powder, and the raw material powder is processed into powder form or powdered trap water, organic binder, etc. as appropriate depending on various molding methods such as pressure molding, extrusion molding, tip molding, and casting molding. Add and granulate,
It consists of a molding process in which a plastic material or slurry-like material is processed into a molded article of a certain shape by adding color through operations such as sizing, mixing, and stirring. Following this molding process, the molded body is subjected to cutting, barrel polishing, and drying processes if necessary, and then undergoes a firing process in which it is heated and fired at a high temperature to obtain a ceramic product.

However, in order to obtain the desired characteristics such as mechanical strength and durability, the conventional manufacturing method of ceramic molded bodies exclusively uses inorganic powder as the starting material, and the chemical composition or constituent mineral phase is different. After mixing the powder to match the target chemical composition, this mixed powder is molded according to the above manufacturing method. Because it progresses through the contact interface of solid particles or the liquid phase slightly present at the contact interface,
K, which produces ceramic products with a uniform composition, requires heat treatment at high temperatures for a long time, and even with this heat treatment, it is extremely difficult to achieve a uniform composition and the properties of ceramics cannot be fully demonstrated. At the point.

Therefore, as a means to solve this problem, the starting raw material powder is pulverized into as fine particles as possible and mixed thoroughly.
This mixed powder is calcined at a temperature lower than the final firing temperature,
Next, the method of pulverizing and mixing this calcined product and then calcining it again is repeated several times to homogenize the composition, and then this calcined powder is molded and fired. However, even with this complex processing method, the compositional or structural homogeneity of the final ceramic product is not sufficient, and the presence of partial heterogeneity and defects is inevitable, and the function and characteristics of the ceramic are affected. This variation causes a decrease in product yield, a decrease in quality reliability, etc., resulting in extremely large economic losses.

Another disadvantage of the conventional method is that the starting material is a powdery homogeneous substance, so a large amount of pulverization power is required to obtain this fine powder, and moreover, foreign matter may be mixed in due to wear of balls, liners, etc. during pulverization. It is impossible to avoid this, making it difficult to produce high-purity raw materials, and processing the dust and powder generated during pulverization is difficult and complicated. Complete continuity is essentially impossible, which hinders process rationalization and automation.

In order to eliminate the various drawbacks mentioned above, the present applicant has proposed K.

A colloid having one or more types of inorganic substances as a dispersed phase is used as a starting material, a liquid having a lower density than the colloid and dissolving the dispersion medium of the colloid is used as an upper liquid, and a liquid with a dense surface larger than that of the colloid is used as a lower layer. the colloid as a liquid, the colloid is supplied around the interface of a two-layer liquid formed by the upper liquid and the lower liquid, and part or all of the dispersion medium of the colloid is desorbed around the interface of the two-layer liquid. Let the said colotoid! l! invented a method for producing a ceramic molded body in which the existing dispersed phase is formed into a molded body,
The application was filed under Japanese Patent Application No. 151368/1984.

The present inventors further investigated the above invention, and obtained the present invention by using a solid carrier instead of the lower liquid in order to further improve the surface smoothness of the molded article. reached.

[Purpose of the invention]

The present invention is.

(1) Homogeneous compacts can be obtained without going through solid powder, (2) Homogeneous compacts of ceramics with complex compositions such as composite oxides can be easily produced, (3) Super High-purity ceramic products can be easily produced. (4) Ceramic molded bodies with even smoother and more homogeneous surfaces, especially film-like molded bodies, can be produced. (5) Continuous ceramic manufacturing process. It is an object of the present invention to provide a method for manufacturing a ceramic molded body that can be processed.

In order to achieve the above object, the present inventors have conducted extensive research and found that, for example, metal or nonmetal oxides, hydroxides, or hydrated compounds thereof, such as all, mu's'g, and Ti, are used as a dispersed phase. When a colloid is injected into a mold, and then the dispersion medium of this colloid is volatilized, K.
It was discovered that a highly pure and dense molded body can be obtained, but since the dispersion medium content of the colloid is generally large, the shrinkage rate of the molded body is large when the dispersion medium is volatilized, causing cracks and deformation in the molded body. Therefore, as a result of further research to develop a new molding and drying method, the present invention was completed.

In addition, in this specification, colloid is 10 to 10.00
A system in which solid particles with a size of 0 angstroms (mu) (1 to 1000 flm) are dispersed in a liquid phase.

[Summary of the invention]

The present invention uses a colloid whose dispersed phase is mainly composed of one or more kinds of inorganic substances as a starting material, coats the colloid on a solid carrier, and coats the colloid on an immersion liquid that dissolves a dispersion medium for the colloid. The dispersion medium of the colloid is partially or completely removed by immersing the carrier, and the dispersed phase remaining in the colloid is formed as a molded body on the carrier.

Preferably, the solid m-body is a mobile carrier, and the colloid is continuously applied thereto, and the solid body is continuously immersed in an immersion liquid.

Moreover, it is preferable that the immersion liquid contains one or more kinds of organic compounds.

Further, it is preferable that this organic compound contains one or more selected from alcohols, ketones, and aldehydes.

Moreover, it is preferable that the alcohol is an alcohol having 6 or less carbon atoms.

Moreover, it is preferable that the ketones are ketones having 6 or less carbon atoms.

Moreover, it is preferable that the aldehyde is an aldehyde having 5 or less carbon atoms.

Further, it is preferable to use a colloid obtained by hydrolyzing food or two or more types of alkoxides as a starting material.

Furthermore, it is preferable to use a mixture of two or more colloids obtained by hydrolyzing one or more alkoxides as the starting material.

The present invention - To further explain, when a colloid coated with a carrier Klk is immersed in an immersion liquid, when a dispersion medium of the colloid is applied in a sol state, the dispersion medium is rapidly absorbed by the immersion liquid. It changes from a sol state to a gel state. Further, when the colloidal dispersion medium is applied in a gel state, the dispersion medium is further absorbed by the immersion liquid and gelation progresses.

As a result, the colloid maintains its coated shape and gradually becomes a molded body mainly composed of a dispersed phase while being supported by the carrier.

At this time, it is also possible to produce a molded article by a so-called batch process in which the carrier tta to which the colloid is coated is a constant color material, and the fixed carrier t is supplied one by one, or by a continuous process using the other carrier as a moving carrier. It is also possible to produce molded bodies. For example, a continuous molded body in the form of a film can be obtained by applying a colloid to a flat moving carrier and continuously immersing it in an immersion liquid.

Note that the temperature of the immersion liquid is set higher than the freezing point of the colloid dispersion medium and the immersion liquid, and lower than their boiling points.

When the gelation of the dispersed phase of the colloid progresses and the colloid condenses into a molded body whose main component is the dispersed phase, this molded body becomes a flexible molded body that does not break even when external stress from kana sand is applied. Therefore, it can be peeled off from the JAL carrier.

Depending on its thickness and the processing method before firing, the above-mentioned molded body can be ←) removed together with the carrier in an immersion liquid, (b) removed from the carrier and then removed in the immersion liquid, or The immersion liquid is pulled up together with the carrier into the space above the immersion liquid, or is pulled up after being peeled from the carrier; - or removed together with the carrier from the liquid container from which the immersion liquid has been discharged, or removed after being peeled off from the carrier.

Next, the molded body is dried in order to remove the dispersion medium remaining in the molded body and/or the immersion liquid that has entered the molded body (1).

This drying method can be carried out by leaving it in the air at room temperature and pressure, or if necessary, by drying it in an atmosphere with appropriately selected temperature conditions, pressure conditions, material conditions constituting the atmosphere, etc. .

The colloidal dispersed phase used in the present invention is not particularly limited and is determined solely by the desired product application and properties, but includes, for example, Mu's"gs"st, ms, Pb.

! Examples include oxides, hydroxides, or hydrated compounds of metals or nonmetals such as n, Zr, and rare earth elements, and may also be mixtures thereof. %, a substance obtained by hydrolysis of one or more alkoxides is preferred. Here, alkoxide refers to metal elements,
Silicon, phosphorus, arsenic, chlorine, tellurium, boron, carbon,
Or, it refers to a compound in which hydrogen in dialcohols is replaced with sulfur.

For example, aluminum isopropoxide is obtained by reacting metallic aluminum with isopropyl alcohol.
-C@HtO)s) Add 100 moles of water to 1 mole and hydrolyze at approximately 80°C for 50 minutes to produce boehmite [M10011)', which is peptized by adding a small amount of hydrochloric acid. As a result, a stable boehmite sol or pseudo-boehmite sol can be obtained. By applying this sol to a carrier and immersing it in the immersion liquid, a desired molded article can be obtained.

The advantage of molding a sol obtained by hydrolyzing an alkoxide as a starting material becomes even more pronounced in the production of a ceramic molded body made of a composite oxide. In other words, a composite oxide is produced by hydrolyzing a mixture of alkoxides consisting of a large number of metal elements constituting this oxide.
It is easily synthesized at a low temperature of 0° C. or lower, and as in the case of boehmite, a sol, in other words, a colloid, can be formed by appropriate peptization treatment.

For example, in the case of barium titanate (!la〒i(h)), which is widely used as a high dielectric constant material, barium isopropoxide and titanium isopropoxide are mixed at a molar ratio of 1:1. This is weighed and weighed in a benzene solution.
Obtain the iO3 precipitate. This white precipitate consists of extremely fine particles, as in the case of other compounds obtained by hydrolysis of alkoxides, and a more stable colloid can be easily obtained by peptizing it, and the molding of the present invention Highly preferred starting materials for the method are provided.

On the other hand, the synthesis of 1aTto= by the conventional method uses powders of barium carbonate (1acos) and titanium dioxide (Ties) as starting materials, which are sufficiently mixed, then pressure-molded and fired. Begin by heating to a temperature of at least 1100
This reaction will not be completed unless heated to 1,550°C or higher, and K to ensure sufficient sintering is required to be treated at a high temperature of 1550°C or higher. In this method, significant shrinkage occurs during the firing process, and mechanical stress is applied to the product, resulting in adverse effects such as distortion and clutter.

On the other hand, if the alkoxide is used as the starting material in the production method of the present invention, the temperature is 100°C or less! IaTiO1 is generated, and even if the firing temperature of the molded body is lowered to around 11200', a ceramic product with a degree of sintering higher than that of the conventional method can be obtained, and there is no phase change during the firing process, so it is homogeneous. It is possible to easily obtain a 1aTio1 ceramic product that is not only dense but also extremely pure.

Even when producing ceramic products with more complex compositions, it is better to use a homogeneous mixture of two or more colloids obtained by hydrolyzing a mixture of one or more alkoxides. A product with excellent properties can be produced stably and at a high yield. The above method can be used, for example, at a normal temperature [r
ye) It is extremely effective when applied to the production of nermista.

Furthermore, using an alkoxide as a starting material means that each component is mixed in an organic solvent, making homogenization extremely easy. A restaurant where starting materials can be created using an automated continuous system.
The following molding process is advantageous in that it can form a continuous production line for ceramics up to the firing process.

The starting materials for the production method of the present invention are not limited to those obtained by hydrolysis and peptization of the alkoxides described above, and for example, ammonia water is added to a metal salt to form a metal hydroxide, and this water is used as a starting material. Various methods can be used, such as forming an oxide into a colloid using a higher alcohol or ester as a dispersion medium.

In addition, a colloid in which a swellable clay mineral containing substituent ions between layers, such as natural smectite or artificial fluorinated mica mineral, is introduced into a dispersion medium and the mineral is used as a dispersed phase, is also suitable as a starting material for the production method of the present invention. It is.

Furthermore, a homogeneous mixed colloid can be easily prepared from a plurality of colloids using different 6c=toid conversion methods, and this mixed colloid can also be used as a starting material in the present invention.

In addition, up to the next dispersion medium removal process and molding process, or the subsequent firing process! I! If a highly flexible molded article is required, this purpose can be achieved by mixing an appropriate amount of a flexible organic binder with the colloid in advance and then molding the colloid. Examples of the organic binder include polyvinyl alcohol, polyvinyl butyral, methylcellulose, polyacrylic acid, polymethacrylic acid, and the like.

Furthermore, prior to molding the colloid, various thickeners or dispersants may be added and mixed in order to adjust the viscosity of the colloid to a range suitable for molding.

Examples of the immersion liquid in which the colloid coated on the carrier is immersed include organic compounds such as alcohols, aldehydes, and ketones. This immersion liquid must have the function of, for example, absorbing the continuously supplied Ploid O dispersion medium, causing solidification and hardening by gelation of the molded body, and subsequently removing the dispersion medium from the molded body. Therefore, when the dispersion medium is composed of water and/or benzene, an organic compound with a small number of carbon atoms is preferable, and the density of the colloid is generally 1.1 to IJ.
t/cj is often 11 degrees, so 1.0 tA
*The following density is preferable.

The alcohols are preferably compounds having 6 or less carbon atoms, such as methyl alcohol, ethyl alcohol,
Includes furfuryl alcohol, clobyl alcohol, butyl alcohol, hexyl alcohol, and isomers of these compounds.

The aldehydes are preferably compounds having 5 or less carbon atoms, such as acetaldehyde, globioaldehyde, butyraldehyde, acrolein, furfural, and isomers of these compounds.

The ketones are preferably compounds having 6 or less carbon atoms, such as acetone, ethyl methyl ketone, propyl methyl ketone, methyl and nyl ketones, cyclohexanone, and op-4 derivatives of these compounds.

The compound constituting the immersion liquid may be one of the various compounds mentioned above, or may be a mixed liquid made by mixing a plurality of the above compounds. The selection of this organic compound is made by taking into consideration various conditions such as the type and content of the dispersion medium constituting the colloid tube, the feeding rate of the colloid-coated carrier, the thickness and width of the molded body, and the speed of removal of the dispersion medium. .

Furthermore, as a method for applying the colloid, when manufacturing by a patch process, a glass plate, a metal plate, an organic polymer plate, etc. is used as a fixed carrier, and the colloid is applied to the fixed carrier by [spraying, pouring, etc.]. A coating method is used.

In addition, in the case of manufacturing using a continuous process, a continuous metal film, organic bulk molecular film, etc. is used as a moving carrier, and this moving carrier is coated with spraying, dipping, doctor blade, reverse roll, pan, etc. The coating method used in some cases is adopted.

As the transfer carrier, metal films such as stainless steel alloy, nickel, and chromium, and organic polymer films such as polypropylene, polyethylene, polyester, and fluororesin are preferred.

, '1- Note that by applying silicone treatment or metal plating treatment to the surface of the fixed and movable carrier, it is also possible to obtain a carrier with excellent removability and surface smoothness.

An example of production using a continuous process is described below. The colloid that is continuously coated on the surface of a moving carrier is supplied together with the moving carrier into an immersion liquid, and part or all of the dispersion medium of the colloid is desorbed. By the gelation of the :II2 id and the resulting coagulation, it is formed into a molded body while being supported by a moving carrier, and is continuously rolled by a winding device, guide rollers, etc. placed outside the immersion housing container. Next, this carried out molded body is peeled off from the moving carrier, and if necessary, the dispersion medium remaining in the molded body is removed using a dryer, and then [sintered] using a tunnel kiln or the like. Particularly, the desired ceramic sheet product is obtained.

If the cutting process is performed prior to the firing process 11K, high-performance ceramic sheet products can be manufactured continuously and efficiently.

In addition, in the case of a molded product in which the above-mentioned flexible binder is added in addition to the sheet-like butt-shaped body, a plurality of sheet-like molded products that have been subjected to various processes may be stacked and pressed.
It is also possible to obtain ceramic products with various cross-sectional shapes.

For reference, a substance equivalent to the substance forming the dispersed phase of the raw material colloid of the present invention was used as a powder raw material, and 10% was prepared based on the conventional method.
After calcining at a temperature of 00°C, an organic binder was added, tape molding was performed, and the resulting molded product had poor surface smoothness and poor mechanical strength compared to the molded product of the present invention. [-1
IK was too weak.

〔Effect of the invention〕

As described above, according to the present invention, (1) Since solid powder is not passed through, pulverization is performed prior to molding.
(2) Cefox molded products with complex compositions such as complex oxides can be produced because they do not require a calcination process and have almost no foreign matter mixed in. However, if each component is mixed to form a raw material colloid and the dispersion medium is removed, a potted gold oxide can be formed at around room temperature, and a molded body that is homogeneous both in composition and structure. (3): Coating on a Froid t-solid carrier,
By removing the immersion liquid, it is possible to produce a molded body with excellent surface smoothness. (4) Since molding is performed continuously in the liquid, a continuous production line for ceramics is formed up to firing step 1. It has great effects.

EXAMPLES In order to clarify the aspects of the present invention, a more specific explanation will be given below using examples, but the examples shown here are merely examples and do not limit the scope of the present invention.

[Example 1] Commercially available alumina sol and silica sol were mixed with water as a dispersion medium and had a mullite composition (molar ratio of 1101:1li (h-S).
: Beating) K is mixed to prepare a raw material colloid.

In order to subject this raw colloid to a patch process, the raw colloid is coated onto a fixed carrier glass plate using an applicator to a thickness of 15 cm. Next, the glass plate coated with this raw material colloid is immersed in methyl alcohol as an immersion liquid, and water, which is the dispersion medium of the raw material colloid, is eliminated with methyl alcohol, and the raw material colloid is gelled. Remove from alcohol.

Next, the sheet-like gel on the glass plate was peeled off from the glass plate and left to dry in air at 40 oct and 1 atm to obtain a formed sheet.

This formed sheet was fired at 1300't to obtain a mullite ceramic sheet having a thickness of 23 μm after firing.

This mullite ceramic sheet is homogeneous and has a surface roughness rL
The surface roughness was 3 μm or less, there were no through holes, and the surface roughness was sufficient to be used as an integrated circuit board without polishing. The mineral composition was confirmed using a tX bell diffractometer to consist only of ultra-high purity mullite.

[Example 2] Aluminum isopropoxide KPH2-4 obtained by reacting metal aluminum with isopropyl alcohol
Boehmite sol was obtained by adding water adjusted to the above and hydrolyzing it. On the other hand, magnesium methoxide obtained by reacting metallic magnesium with methanol was hydrolyzed by adding water to obtain blue side sil.

Both of them have a spinel composition (molar ratio: 1,0: ig
go-1:1) K is mixed to prepare a raw material colloid.

In order to process this raw material colloid in a continuous process, 1. This raw material colloid is coated on a polyester film of a moving carrier to a thickness of j1w+ by the dogta blade coating method. Next, the polyester film coated with this raw material colloid is continuously immersed in cyclohexanone, an immersion liquid, and is desorbed with aqueous cyclohexanone, which is a dispersion medium for the raw material colloid. After gelling the raw material colloid, the cyclohexanone pull up

Next, a sheet of glue was placed on the polyester film. Peel it off from the polyester film and remove it from the polyester film.

1! Cyclohexanone remaining in this sheet-like gel was continuously removed by passing it through air at atmospheric pressure, and the sheet-like gel was heated to a thickness of 60-
A dry molded sheet was obtained.

This molded sheet is fired at 12000C and J1 after firing
A spinel ceramic sheet of 1#"20" was obtained.

This spinel ceramic sheet is homogeneous and has a surface roughness rL
! - Below, there were no through holes at all. The mineral composition was confirmed to consist only of ultra-high purity spinel using tube chemical analysis and an X9 diffractometer. Moreover, although it was thinner than the ceramic sheet of Example 1, it had a strength sufficient for practical use without causing any trouble in handling.

[Example 3] A silica sol obtained by adding water to ethyl orthosilicate and hydrolyzing it, the boehmite sol used in Example 2, and blueside sil were mixed with cordierite (COrdierit).
e, 2Mg0 @ 2m1. Os @ 5g1Os
) composition (molar ratio of MgO: 0.:1io
n = 2:2:5) to produce raw material colloid KM.

In order to process this raw material colloid through a continuous process, K
Add 15% by weight of polyvinyl alcohol based on the solid content of the raw colloid to Km of the raw colloid, and coat the nickel metal tape of the moving carrier with a thickness of 0.1 mm by tape casting based on the reverse roll coating method. .

Next, the coated nickel metal tape is continuously immersed in an immersion liquid of isobutyraldehyde to remove water, which is a dispersion medium for the raw material colloid, with the isobutyraldehyde and gel the raw material colloid. Extracted from aldehyde.

Next, the sheet-like gel on the nickel metal tape was peeled off from the metal tape and passed through a vapor atmosphere of iso7tyraldehyde at 40'C11 atm to give a thickness of iL2@IMnt.
) A dried molded sheet) 1 was obtained.

This formed sheet was fired at 1s00°C to obtain a cordierite ceramic sheet having a thickness of 7 Jfln after firing.

[Example 4] Zirconium isopropoxide and the magnesium methoxide used in Example 2 were mixed at a ratio of 95% by weight in terms of Zr01 and 5% by weight in terms of MgO, and water was added to the mixture for hydrolysis. A stabilized zirconia raw material sol using water as a dispersion medium was obtained as a raw material colloid.

In order to process this raw material colloid in a continuous process, 1. A high-density polyethylene tape serving as a moving carrier is coated with a thickness of 81 mm by tape casting based on the dogta blade coating method. Next, the coated high-density polyethylene tube was continuously immersed in a mixed immersion liquid of butyl alcohol and methyl alcohol (1:1 by volume) at 5°C to remove water, which is the dispersion medium of the raw colloid. After being released, the gel ta device in the form of a congealed sheet is peeled off from the polyethylene tape. Next, this sheet-like gel was transferred onto a Teflon tape and passed through air at 40°C and 1 atm to continuously remove the immersion liquid remaining on this sheet-like gel and dry it to a thickness of 40 II m. A molded sheet was obtained.

This formed sheet is heated at 1500°C and the thickness after firing is 8.
A stabilized zirconium sheet with a diameter of 107 im was obtained.

[Example 5] Ha□Mg,s, which is a kind of swellable artificial fluorinated mica mineral
Water was added to Lit (5i4o)F to cause it to swell and peptize to obtain a swellable artificial fluorinated mica sol with a solid content of 10% by weight as a raw material colloid.

In order to process this raw material colloid in a continuous process, polyacrylamide of 10 weight 9G based on the solid content of this raw material colloid is added to the raw material colloid, and a high-density mobile carrier is formed by tape casting based on the reverse roll coating method. A polyethylene film is coated with a thickness of 1-. Next, the coated high-density polyethylene film was continuously immersed in an immersion liquid of ethyl alcohol at 25°C, and after partially removing water, which is a dispersion medium for the raw colloid, with the ethyl alcohol, it was coagulated. Peel the sheet-like gel from the high-density polyethylene film. Next, this sheet-like gel was transferred onto a tape manufactured by Thea-ON, and passed through an air atmosphere of 1 atm with a 40'C-1 relative humidity of 20 degrees or less to remove the above-mentioned dispersion medium remaining on this sheet-like gel and The immersion liquid was continuously removed to obtain a homogeneous, multi-layered, dried molded sheet with a thickness of 50 pm.

Procedural amendment dated July 26, 1981 Patent Order No. 37819 3 of 1981, Relationship with the case of the person making the amendment Patent applicant Address 5-1 Marunouchi-chome, Chiyoda-ku, Tokyo Name Mitsubishi Mining Cement 'Co., Ltd. Representative Blind Kobayashi 4, Agent 6, Number of inventions increased by amendment None 7, "Detailed explanation of the invention" column 8 of the specification subject to the amendment, Contents of the amendment (11 Page 6 of the specification) In the 17th line, ``I came to obtain -1---...'' is corrected to ``r---...Completed.''

c) Specification, page 8, line 15r --------1. Formed as a molded body----
"..." is corrected to "...--formed as a molded body...".

(3) Specification No. 9! Line 18 - Line 19 of the same page “-1--..., the dispersion medium of the colloid...
−・−・” is changed to r −−−−−・, the colloid is corrected as “−・・−・”.

(Brown Specification page 10, line 1 to question page, line 2 r --
------・Also, the dispersion medium of the colloid is -------" is corrected to "-111--. Also, the colloid is...-----".

(5) Specification, page added, line 10r ----------・Remaining dispersion medium------''
is corrected as "-------remaining dispersion medium and immersion liquid or immersion liquid-------".

(6) Specification page n, line 1 to question page, line 2 r -
----..., change the immersion liquid to ``------...'', and correct the dispersion medium to ``-----J''.

(7) Page 6, line 14 of the specification,
---" is corrected to ".-- by chemical analysis and X-ray diffraction equipment."

+81 Previous page of specification letter, line 18r ---- Stabilized zirconium sheet of -・-
---..." is corrected to "---- stabilized zirconia sheet 111-...".

Claims (9)

[Claims] (1) Starting material is a colloid whose dispersed phase is mainly composed of one or more inorganic substances, the colloid is applied to a solid carrier, and the colloid is applied to an immersion liquid that dissolves the dispersion medium of the colloid. A method for producing a ceramic molded body, which comprises immersing the colloid-treated carrier to remove part or all of the dispersion medium of the colloid, and forming the dispersed phase remaining in the colloid as a molded body on the carrier. (2) The method for producing a ceramic molded body according to claim (1), wherein the solid carrier is a moving carrier, and the colloid is continuously applied to the solid carrier and the ceramic molded body is continuously immersed in an immersion liquid. (3) The method for producing a ceramic molded body according to claim (1) or (2), wherein the immersion liquid contains one or more organic compounds. (4) The method for producing a ceramic molded body according to claim (3), wherein the organic compound contains one or more selected from alcohols, ketones, and aldehydes. (5) The method for producing a ceramic molded body according to claim (4), wherein the alcohol is an alcohol having 6 or less carbon atoms. (6) The method for producing a ceramic molded body according to claim (4), wherein the ketones are ketones having 6 or less carbon atoms. (7) The method for producing a ceramic molded body according to claim (4), wherein the aldehyde is an aldehyde having 5 or less carbon atoms. (8) A method for producing a ceramic molded body according to any one of claims (1) to (7), using a colloid obtained by hydrolyzing one or more alkoxides as a starting material. . (9) Claims (1) to (2) in which the starting material is a mixture of two or more colloids obtained by hydrolyzing one or more alkoxides.
7) A method for producing a ceramic molded body according to any one of items 7).