JP4165999B2 - Method for drying ceramic molded body, method for producing porous ceramic member, and method for producing ceramic filter - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a method for drying a ceramic molded body used for drying a columnar ceramic molded body containing ceramic powder, a binder and the like and having a large number of through-holes arranged side by side in the longitudinal direction. The present invention relates to a method for producing a porous ceramic member using a ceramic molded body, and a method for producing a ceramic filter using the porous ceramic member obtained by the above production method.
[0002]
[Prior art]
Recently, it has been a problem that particulates contained in exhaust gas discharged from internal combustion engines such as vehicles such as buses and trucks and construction machines cause harm to the environment and the human body.
Various ceramic filters that purify exhaust gas by collecting particulates in the exhaust gas by passing the exhaust gas through a porous ceramic have been proposed.
[0003]
The ceramic filter usually comprises a ceramic filter 40 in which a plurality of porous ceramic members 50 as shown in FIG. Further, as shown in FIG. 7, in the porous ceramic member 50, a large number of through holes 51 are arranged in the longitudinal direction, and the partition wall 53 that separates the through holes 51 functions as a filter.
[0004]
That is, in the through hole 51 formed in the porous ceramic member 50, as shown in FIG. 7B, either the inlet side or the outlet side end of the exhaust gas is sealed with the filler 52, The exhaust gas that has flowed into the through holes 51 always passes through the partition wall 53 that separates the through holes 51 and then flows out from the other through holes 51. When the exhaust gas passes through the partition wall 53, The curate is captured by the partition wall 53, and the exhaust gas is purified.
[0005]
Conventionally, when manufacturing such a porous ceramic member 50, first, a ceramic powder, a binder, and a dispersion medium liquid are mixed to prepare a mixed composition for manufacturing a molded body, A ceramic molded body was produced by performing extrusion molding or the like.
[0006]
Then, the obtained ceramic molded body is put into a drying apparatus, and the ceramic molded body is heated by irradiating with hot air to disperse and evaporate the dispersion medium liquid etc. in the ceramic molded body. The dry body 200 of the ceramic molded body shown in FIG. 8A that can be easily handled is manufactured.
After this drying step, the porous ceramic member 50 is manufactured through a degreasing step and a firing step.
[0007]
However, in such a conventional method for drying a ceramic molded body, it is not easy to completely dry the ceramic molded body.
That is, the drying of the ceramic molded body with hot air is the most commonly performed method. However, if the ceramic molded body is quickly dried only with hot air, the ceramic molded body is dried in the drying process. A large difference in moisture content tends to occur between the portion close to the surface and the inside of the ceramic molded body, and as a result, as shown in FIGS. 8B and 8C, a large warp occurs in the ceramic molded body, Cracks will occur.
[0008]
In addition, when trying to dry slowly so as not to cause such warpage and cracks, in order to dry the ceramic molded body completely, it is necessary to perform drying for an extremely long time. Could not do.
[0009]
[Problems to be solved by the invention]
The present invention has been made to solve these problems, and in the drying process of the ceramic molded body, when the ceramic molded body is dried, warping, cracks, etc. due to uneven evaporation of moisture in the ceramic molded body are provided. An object of the present invention is to provide a method for drying a ceramic molded body, a method for producing a porous ceramic member, and a method for producing a ceramic filter, which can be uniformly dried in a short time without being generated. It is.
[0010]
[Means for Solving the Problems]
The method for drying a ceramic molded body of the present invention comprises a columnar ceramic molded body comprising a mixed composition of ceramic powder, a binder, and a dispersion medium liquid, and a large number of through holes arranged in parallel in the longitudinal direction with a partition wall therebetween. Two plate-like bodies made of a material having a thermal conductivity of 50 W / m · K or more are sandwiched between ceramic shaped body drying jigs joined in a V shape,
Applying a predetermined pressure to the entire side surface of the ceramic molded body through the ceramic molded body drying jig by a member that applies pressure to the ceramic molded body included in the ceramic molded body drying jig is dried. It is characterized by.
The method for producing a porous ceramic member of the present invention includes a step of drying the ceramic molded body by the method for drying a ceramic molded body of the present invention , and a step of firing the ceramic molded body dried by the drying method. It is characterized by that.
The method for producing a ceramic filter according to the present invention is characterized in that after the porous ceramic member is produced by the method for producing a porous ceramic member of the present invention, a plurality of porous ceramic members produced by the production method are bound. And
[0011]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of a method for drying a ceramic molded body, a method for producing a porous ceramic member, and a method for producing a ceramic filter according to the present invention will be described with reference to the drawings.
The method for drying a ceramic molded body of the present invention comprises a columnar ceramic molded body comprising a mixed composition of ceramic powder, a binder, and a dispersion medium liquid, and a large number of through holes arranged in parallel in the longitudinal direction with a partition wall therebetween. Two plate-like bodies made of a material having a thermal conductivity of 50 W / m · K or more are sandwiched between ceramic shaped body drying jigs joined in a V shape,
Applying a predetermined pressure to the entire side surface of the ceramic molded body through the ceramic molded body drying jig by a member that applies pressure to the ceramic molded body included in the ceramic molded body drying jig is dried. It is characterized by.
A method for manufacturing a porous ceramic member of the present invention, the step of drying the ceramic molded body in the drying method of a ceramic molded body of the present invention, and a step of firing the ceramic molded body is dried by the drying method It is characterized by that.
The method for producing a ceramic filter according to the present invention is characterized in that after the porous ceramic member is produced by the method for producing a porous ceramic member of the present invention, a plurality of porous ceramic members produced by the production method are bound. And
[0012]
The material constituting the ceramic molded body drying jig of the present invention has a thermal conductivity of 50 W / m · K or more. When the thermal conductivity is less than 50 W / m · K, the efficiency of heating the ceramic molded body is lowered, and the ceramic molded body cannot be effectively dried. The thermal conductivity is desirably 200 W / m · K or more. Since the heating efficiency of the ceramic molded body is excellent, the drying process can be performed in a short time, and the ceramic molded body can be dried uniformly and reliably.
[0013]
The ceramic molded body drying jig of the present invention is composed of an upper jig and a lower jig, and the ceramic molded body is sandwiched between the upper jig and the lower jig so as to hold the ceramic molded body. It is desirable that the structure be dried. This is because heat can be uniformly propagated to the entire side surface of the ceramic molded body and the entire side surface of the ceramic molded body is sandwiched, so that it is possible to prevent the ceramic molded body from being warped.
[0014]
The material constituting the upper jig and the lower jig is not particularly limited as long as it has the above-described thermal conductivity. For example, aluminum, copper, platinum, gold, silver, tungsten, molybdenum, nickel It is desirable that the metal material. This is because such a metal material has a high thermal conductivity, and hardly deteriorates in accuracy due to heat, deteriorates in the surface state, breaks due to carbonization, etc., and has excellent durability.
[0015]
Among the above metal materials, aluminum is more desirable. Because the thermal conductivity exceeds 200 W / m · K and the heating efficiency of the ceramic molded body is excellent, the ceramic molded body can be dried uniformly in a short time, and it is light and excellent in handleability. is there.
[0016]
When the upper jig and the lower jig are made of aluminum, it is desirable that the upper jig and the lower jig are subjected to an alumite treatment. This is because the upper jig and the lower jig have excellent corrosion resistance, and the ceramic molded body drying jig can be used continuously over a long period of time.
[0017]
FIG. 1 is a perspective view schematically showing an example of a ceramic molded body drying jig of the present invention.
As shown in FIG. 1, the ceramic molded body drying jig 10 mainly includes an upper jig 11 and a lower jig 12 configured so as to surround the ceramic molded body in a close contact state from above and below. It consists of.
[0018]
The upper jig 11 has a shape in which two plate-like bodies 110 are joined in a V-shape, and the plate-like body 110 is provided with four pressing spring members 13. The lower jig 12 has substantially the same shape as the upper jig 11 except that the pressing spring member is not provided, and two plate-like bodies 120 are joined in a V shape.
A plurality of support members 115 and 125 are bonded and fixed to the upper jig 11 and the lower jig 12 so that these jigs can be stably placed on the floor surface. Yes.
[0019]
Each member constituting the upper jig 11 and the lower jig 12 is made of a material having the above-described thermal conductivity, and the ceramic molded body drying jig 10 having such a configuration is used to make a ceramic. In order to hold the molded body, the ceramic molded body is placed on the lower jig 12 with the side surfaces inclined, the upper jig 11 is placed thereon, and the ceramic is formed using the pressing spring member 13. While applying pressure to the compact, the upper jig 11 and the lower jig 12 are brought into close contact with the ceramic compact. Since the upper jig 11 and the lower jig 12 have substantially the same configuration, they can be used upside down.
[0020]
As described above, the ceramic molded body drying jig 10 sandwiches and dries the ceramic molded body while applying pressure, and thus almost completely prevents warpage of the ceramic molded body, cell breakage (crack), and the like. be able to.
[0021]
The size of the ceramic molded body drying jig 10 is not particularly limited, and is appropriately adjusted in accordance with the size of the ceramic molded body to be dried.
[0022]
The pressing spring member 13 is not limited to four as shown in the figure as long as an equal pressure can be applied to the ceramic molded body sandwiched between the upper jig 11 and the lower jig 12. For example, six or eight may be used, but the number is preferably an even number, and the upper jig 11 is provided so as to be paired two by two, and is equal to the upper jig 11. It is desirable that they are arranged in the order. This is because when a ceramic molded body is sandwiched between the upper jig 11 and the lower jig 12, a pressure is evenly applied to the ceramic molded body. However, if the number of the pressing spring members 13 is increased, it takes time to attach and remove the upper jig 11 and the lower jig 12, and the handling is inferior.
[0023]
FIG. 2 is a perspective view schematically showing the pressing spring member 13.
The pressing spring member 13 mainly includes a spring 14, a fixing member 15, and a pressing member 16.
The material of the fixing member 15 and the pressing member 16 is not particularly limited, and examples thereof include a metal material such as SUS, a ceramic material such as aluminum nitride, and a resin or the like is used if the strength is sufficient. be able to.
[0024]
Both ends of the fixing member 15 are bent upward, and through holes are formed in the opposing bent portions so that the support rods 17 can be inserted therethrough. Further, the fixing member 15 is formed with a screw hole, and is fixed to the plate 110 of the upper jig 11 by screwing as shown in FIG.
[0025]
The pressing member 16 is formed in a U-shape, two side plates 19 that are in contact with the inside of the bent portion of the fixing member 15, a back plate 160 that supports and fixes these two side plates 19, and the side plate 19. It is comprised from the press bar 18 attached to the lower part of this. Further, a through hole is formed in the side plate 19, and a support rod 17 is inserted through the through hole.
[0026]
On the other hand, the spring 14 has a support rod 17 inserted therein and is pivotally supported by the support rod 17. Then, both end portions of the spring 14 are straightly extended, abut against the back plate 160 of the pressing member 16, and the central portion of the spring 14 is also pulled out to form an inverted U shape (inverted V shape). This portion is in contact with the bottom plate of the fixing member 15. By configuring the pressing spring member 13 in this way, the pressing member 16 configuring the pressing spring member 13 is urged in the direction of the arrow.
In addition, it does not specifically limit as a material of the spring 14, What has a predetermined repulsive force can be selected suitably, and can be used.
[0027]
Therefore, as shown in FIG. 1, when the upper jig 11 having the plurality of pressing spring members 13 and the lower jig 12 are fitted, the pressing rod 18 attached to one end of the pressing member 16. Presses the plate-like body 120 of the lower jig 12, and as a result, a predetermined pressure is applied to the entire side surface of the ceramic molded body placed inside by the upper jig 11 and the lower jig 12. Is done.
[0028]
The pressure applied to the ceramic molded body is preferably 0.1 to 0.6 MPa. If the pressure is less than 0.1 MPa, the ceramic molded body may be warped or broken in the hot air drying step. On the other hand, if it exceeds 0.6 MPa, the cells of the ceramic molded body may be deformed or damaged.
[0029]
The ceramic molded body drying jig 10 is used when the ceramic molded body is dried with hot air. Since the pressure as described above is applied to the ceramic molded body, Some strength is required. This is because the ceramic molded body that has just been formed has insufficient strength, and the pressure received from the ceramic molded body drying jig 10 easily causes cell deformation and breakage in the ceramic molded body.
Therefore, before performing hot air drying using the ceramic molded body drying jig 10, it is necessary to dry the ceramic molded body to some extent by microwaves or the like.
[0030]
Further, as a method of applying pressure to the ceramic molded body without using the spring 14 or the like, for example, a string-like elastic body with hooks attached to both ends is placed around the upper jig 11 and the lower jig 12. Examples of the method include winding with the hook, fastening the drying jig, and applying pressure.
[0031]
Furthermore, for example, by embedding the electromagnets in the two plate-like bodies 110 and 120 constituting the upper jig 11 and the lower jig 12, and setting the upper and lower electromagnets to pull each other, May be applied.
[0032]
The ceramic molded body to be dried in the present invention is composed of a mixed composition of ceramic powder, binder and dispersion medium.
[0033]
The ceramic powder is not particularly limited, and examples thereof include non-oxide ceramic powders such as silicon carbide, silicon nitride, aluminum nitride, boron nitride, titanium nitride, and titanium carbide; alumina, cordierite, mullite, silica, zirconia, Examples thereof include oxide ceramic powders such as titania.
[0034]
The particle size of these ceramic powders is not particularly limited, but those having less shrinkage in the subsequent firing process are preferred. For example, 100 parts by weight of powder having an average particle size of about 0.3 to 50 μm and 0.1 A combination of 5 to 65 parts by weight of powder having an average particle diameter of about 1.0 μm is preferable.
[0035]
The binder is not particularly limited, and examples thereof include methyl cellulose, carboxymethyl cellulose, hydroxyethyl cellulose, polyethylene glycol, phenol resin, and epoxy resin.
Usually, the amount of the binder is preferably about 1 to 10 parts by weight with respect to 100 parts by weight of the ceramic powder.
[0036]
The dispersion medium liquid is not particularly limited, and examples thereof include organic solvents such as benzene; alcohols such as methanol, and water. An appropriate amount of the dispersion medium liquid is blended so that the viscosity of the mixed composition falls within a certain range.
These ceramic powder, binder, dispersion medium and the like are mixed by an attritor or the like, then sufficiently kneaded by a kneader or the like, and formed into a predetermined shape by an extrusion molding method or the like.
[0037]
As described above, the ceramic molded body drying jig of the present invention is made of a material having a thermal conductivity of 50 W / m · K or more. Accordingly, since the heat applied to the ceramic molded body drying jig propagates well in the ceramic molded body drying jig, the heating efficiency of the ceramic molded body becomes excellent, and the ceramic molded body can be removed in a short time. It can be dried uniformly.
[0038]
Next, the process of drying a ceramic molded body using the ceramic molded body drying jig of the present invention will be described with reference to the drawings.
[0039]
First, as described above, before performing hot-air drying of the ceramic molded body using the ceramic molded body drying jig of the present invention, the ceramic molded body is irradiated with microwaves to dry the ceramic molded body to some extent.
[0040]
FIG. 3 is a cross-sectional view schematically showing an example of a microwave drying apparatus used in the microwave drying process.
[0041]
As shown in FIG. 3, first, the ceramic molded body 22 produced by the above-described method is placed in the molded body passage 25 in the microwave drying apparatus 20 including the microwave generator 21 and the microwave stirring stirrer 24. Carry in.
[0042]
In the microwave drying apparatus 20, the microwave 210 to be irradiated is stirred by the microwave stirring stirrer 24, thereby uniformly irradiating the ceramic molded body 22 with the microwave 210 and heating the dispersion medium liquid and the like. To dry.
[0043]
Conditions such as the power of the microwave 210 at the time of drying depend on the shape of the target ceramic molded body 22 and the size of the through holes, and thus cannot be defined unconditionally. For example, the ceramic molded body 22 Is 33 mm × 33 mm × 300 mm, the number of through holes is 31 / cm ² , and the partition wall thickness is 0.35 mm, the power of the microwave 210 is preferably about 0.5 to 4 kW. Even if the shape and size of the ceramic molded body 22 are different, the drying conditions do not deviate greatly from the above-described conditions.
[0044]
At this time, as shown in FIG. 4, a drying jig comprising a glass epoxy lower jig 27 and an upper jig 26 configured to be able to surround the ceramic molded body 22 from above and below in close contact. The ceramic molded body 22 may be placed on the lower jig 27 with the side surfaces inclined, and the upper jig 26 may be placed on the ceramic molded body 22 so that the ceramic molded body is brought into close contact therewith.
[0045]
Although not shown, an elastic member capable of absorbing moisture may be interposed between the ceramic molded body 22 and the upper jig 26 or the lower jig 27. By interposing such an elastic member, the evaporated water is absorbed by the elastic member, and the drying efficiency of the ceramic molded body 22 is improved.
As the elastic member, a porous elastic member made of plastic or rubber is preferable, and silicon sponge is more preferable.
[0046]
By using such a drying jig, the evaporation of moisture from the side surface (surface) of the ceramic molded body 22 can be controlled, and the moisture content between the surface and the inside of the ceramic molded body 22 is reduced. It is possible to prevent deformation such as warpage due to uniformity, cell breakage (cracking in the partition walls separating the through holes), and the like.
[0047]
When the ceramic molded body is completely dried by irradiating the ceramic molded body with microwaves, the dispersion medium liquid (moisture) is removed to some extent from the ceramic molded body. As a result, the temperature of the ceramic powder inside the molded body suddenly rises and the binder begins to decompose before moisture is completely removed, which causes cracks, etc. There is a problem that it becomes easy to do.
However, in the above-described drying by microwaves, since it is controlled to evaporate and remove up to about 65 ± 15% of the total moisture in the ceramic molded body, the microwave is absorbed by the ceramic powder, and the ceramic molded body The temperature of the ceramic powder does not rise rapidly and decomposition (degreasing) of the binder does not start.
[0048]
After the said microwave drying process, as shown in FIG. 5, the ceramic molded body 22 is carried in to the hot air drying apparatus 30 provided with the hot air generator 32 and the air blower 31, and it dries with a hot air. FIG. 5 is a cross-sectional view schematically showing an example of a hot air drying apparatus used in the hot air drying process.
At this time, in order to evaporate the moisture of the ceramic molded body 22 as uniformly as possible, the hot air 33 generated by the hot air generator 32 passes through the side walls 34a and 34b at a high speed by the blower 31 as shown in FIG. Thus, the hot air generator 32 and the blower 31 are arranged, and the direction in which the hot air 33 smoothly passes through the through hole 23 (that is, the direction of the through hole 23 is parallel to the direction of the hot air 33). The ceramic molded bodies 22 are aligned and dried in the direction).
[0049]
Moreover, as shown in FIG. 5, it can dry uniformly by sending the hot air 33 alternately from right and left for every fixed time.
The temperature of the hot air 33 at this time is preferably RT (normal temperature) to 120 ° C., and the wind speed of the hot air 33 is preferably 5 to 40 m / sec.
[0050]
If the temperature of the hot air 33 is less than 50 ° C., the drying speed of the ceramic molded body 22 is slow and cannot be efficiently dried. On the other hand, if the temperature of the hot air 33 exceeds 120 ° C., the ceramic molded body 22 Since it dries rapidly, it dries unevenly, and cracks are likely to occur.
Moreover, when the wind speed of the hot air 33 is less than 5 m / sec, the drying speed becomes slow, and unevenness of drying occurs in the ceramic molded body 22. On the other hand, when the speed of the hot air 33 exceeds 40 m / sec, the drying of the surface proceeds. Moreover, since the wind speed is too high, the ceramic molded body 22 is liable to move, which is not preferable.
[0051]
In such a hot air drying process of the ceramic molded body, the ceramic molded body drying jig of the present invention described above is used to surround the ceramic molded body in a close contact state from above and below, and a predetermined pressure is applied to the ceramic molded body. While adding, the ceramic compact is dried.
[0052]
In the whole process of hot air drying, it is difficult to make the moisture content inside the ceramic molded body completely uniform. Therefore, the ceramic molded body may be warped due to the non-uniformity of moisture. For this reason, by using the jig for drying a ceramic molded body of the present invention, applying a constant pressure to the entire periphery of the side surface of the ceramic molded body prevents warping and the like from occurring.
Furthermore, since the material constituting the jig for drying a ceramic molded body of the present invention has a high thermal conductivity of 50 W / m · K or more, it is excellent in heating efficiency of the ceramic molded body and can be formed in a short time. The body can be dried uniformly.
[0053]
In addition, the drying apparatus used in the drying process of the ceramic molded body described above usually incorporates an automatic control apparatus incorporating a microcomputer, and of course, setting of microwave power, hot air temperature, hot air speed, etc. When the ceramic molded body is carried into a microwave drying apparatus or hot air drying apparatus, for example, the ceramic molded body is automatically detected by an infrared sensor or the like, microwaves are generated, and a microwave stirring stirrer is driven. The hot air generator or the blower is operated.
[0054]
【Example】
Hereinafter, the present invention will be described in more detail with reference to examples. However, the present invention is not limited to these examples.
[0055]
Example 1
70 parts by weight of α-type silicon carbide powder having an average particle diameter of 10 μm, 30 parts by weight of β-type silicon carbide powder having an average particle diameter of 0.7 μm, 5 parts by weight of methylcellulose, 4 parts by weight of a dispersant, and 20 parts by weight of water are uniformly mixed. The mixed composition of the raw materials was prepared by mixing.
[0056]
This mixed composition was filled in an extruder, and a ceramic molded body 22 having a shape as shown in FIG. 4 was produced at an extrusion speed of 2 cm / min. The ceramic molded body 22 had a size of 30 mm × 30 mm × 300 mm, the number of through holes 23 was 31 / cm ² , and the partition wall thickness was 0.35 mm.
[0057]
Next, as shown in FIG. 4, after the ceramic molded body 22 is placed on the lower jig 27, the upper jig 26 is placed on the ceramic molded body 22, and in this state, the microwave drying shown in FIG. After carrying into the apparatus 20 and setting the microwave power to 3 kW and drying the ceramic molded body 22 for 1 minute, when the moisture content of this ceramic molded body 22 was measured, 65% of the initial moisture content was Evaporated and removed.
[0058]
Next, the ceramic molded body 22 dried by the microwave is placed on the lower jig 12 of the aluminum ceramic molded body drying jig 10 (see FIG. 1) whose surface is anodized, and the upper jig The tool 11 was placed on the ceramic molded body 22 and fixed at a pressure of 0.5 MPa using a pressing spring member 13. The ceramic molded body drying jig 10 had a thermal conductivity of 237 W / m · K.
In this state, it was carried into the hot air drying apparatus shown in FIG. 5 and dried under the conditions of a hot air temperature of 50 ° C. and a hot air speed of 35 m / sec. We were able to.
When the dried body of the ceramic molded body 22 was observed in detail, the dried body of the ceramic molded body 22 warped and no cell breakage occurred.
[0059]
Comparative Example 1
After the ceramic molded body was produced in the same manner as in Example 1, it was carried into the hot air drying apparatus 30 shown in FIG. 5 without drying by microwaves, and the ceramic molded body drying treatment as shown in FIG. The ceramic molded body was dried under the conditions of a hot air temperature of 100 ° C. and a hot air speed of 35 m / second without using any tools, and the moisture was evaporated almost completely by drying for 1 hour. I was able to.
In addition, when the dried body of the ceramic molded body was observed in detail, warpage as shown in FIG. 8 (b) and cell breakage as shown in (c) occurred in the dried body of the ceramic molded body. It was.
[0060]
【The invention's effect】
The ceramic molded body drying jig according to the present invention is as described above. Therefore, when the ceramic molded body is dried, the ceramic molded body does not generate deformation such as warpage due to non-uniform evaporation of moisture in the ceramic molded body. The whole can be dried uniformly and in a short time.
[Brief description of the drawings]
FIG. 1 is a perspective view schematically showing an example of a ceramic molded body drying jig of the present invention.
FIG. 2 is a perspective view schematically showing a pressing spring member constituting the ceramic molded body drying jig shown in FIG. 1;
FIG. 3 is a cross-sectional view schematically showing a microwave drying apparatus.
4 is a perspective view schematically showing the microwave drying jig and the ceramic molded body shown in FIG. 3. FIG.
FIG. 5 is a cross-sectional view schematically showing a hot air drying device.
FIG. 6 is a perspective view schematically showing a ceramic filter.
7A is a perspective view schematically showing a porous ceramic member constituting a ceramic filter, and FIG. 7B is a longitudinal sectional view parallel to the longitudinal direction thereof.
8A to 8C are perspective views schematically showing a ceramic molded body after being dried under various conditions.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 10 Ceramic shaping | molding body drying jig | tool 11 Upper jig | tool 12 Lower jig | tool 13 Pressing spring member 14 Spring 15 Fixing member 16 Pressing member 17 Supporting rod 18 Pressing rod 19 Side plate 110, 120 Plate-shaped body 160 Back plate

Claims (10)

A columnar ceramic molded body comprising a mixed composition of ceramic powder, a binder, and a dispersion medium liquid, and having a large number of through holes arranged in parallel in the longitudinal direction with a partition wall therebetween, has a thermal conductivity of 50 W / m · K or more. Two plate-shaped bodies made of materials are sandwiched by a ceramic molded body drying jig joined in a V shape,
Applying a predetermined pressure to the entire side surface of the ceramic molded body through the ceramic molded body drying jig by a member that applies pressure to the ceramic molded body included in the ceramic molded body drying jig and drying the ceramic molded body. A method for drying a ceramic molded body characterized by   The method for drying a ceramic molded body according to claim 1, wherein the pressure is 0.1 to 0.6 MPa.   The method for drying a ceramic molded body according to claim 1, wherein the drying is hot air drying.   The method for drying a ceramic molded body according to claim 3, wherein an air speed of the hot air drying is 5 to 40 m / S.   The method for drying a ceramic molded body according to claim 3 or 4, wherein the temperature of the hot air drying is from room temperature to 120 ° C. The ceramic molded body drying jig according to any one of claims 1 to 5, wherein the ceramic molded body drying jig includes an upper jig and a lower jig made of aluminum. The method for drying a ceramic molded body according to claim 6 , wherein the upper jig and the lower jig are subjected to alumite treatment. Drying the ceramic molded body in the drying method according to any one of claims 1 to 7, and a porous ceramic member which comprises a step of firing the ceramic molded body is dried by the drying method Manufacturing method. The method for producing a porous ceramic member according to claim 8 , comprising a step of degreasing the ceramic molded body before the firing step. A method for producing a ceramic filter, comprising: producing a porous ceramic member by the production method according to claim 8 or 9 ; and binding a plurality of porous ceramic members produced by the production method.

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