JP2002121087A - Ceramics porous sintered compact and method for producing the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a ceramic porous sintered compact which is obtained by charging a porous sintered ceramic body having pore diameter, porosity or the like different from those of a porous sintered ceramic base material into the pores of the porous sintered ceramic base material without causing strain, fractures, cracks or the like, and to provide a method for producing the sintered compact. SOLUTION: The porous sintered ceramic body B having a grain-coupled structure is charged into consecutive sphere form open pores 2 mutually communicating of the porous sintered ceramic base body A.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a ceramic porous sintered body, and more particularly, to a ceramic porous body in which a ceramic sintered body having a specific porous structure is filled in open pores of a porous sintered ceramic base material. The present invention relates to a quality sintered body.

[0002]

2. Description of the Related Art Conventionally, a ceramic porous sintered body has been known for its permeability, absorptivity, and adsorptivity based on its porous structure.
In addition to various properties such as adsorption retention, chemical durability based on ceramics itself, sanitary harmlessness, strength characteristics, heat resistance,
Because it has various properties such as biocompatibility, it is used in various industrial fields and various applications, such as various filters, lightweight structural materials, catalyst carriers, bioreactors, separation membrane support materials, artificial bones, sustained release chemicals, etc. Have been.

[0003] Among these members made of ceramic porous sintered bodies, those obtained by bonding porous ceramics to a dense glass body, and those obtained by laminating porous ceramics to a dense ceramic substrate by fusing or bonding. On the contrary, there are those obtained by coating a porous ceramic substrate with a dense ceramic layer. Further, there is a member in which ceramic porous sintered bodies are joined and integrated by using an adhesive such as an epoxy resin.

[0004]

By the way, inside a porous sintered ceramic substrate (porosity), a porous ceramic body having a different porous structure such as a pore diameter and a porosity from the substrate is sintered. Conventionally, the formed porous ceramic sintered body has hardly been manufactured. This is because, when a ceramic slurry or the like is introduced into a base material and sintering is performed by a normal method, the shape and state of the base material itself are deformed and changed by heat, and the porous ceramic body is contracted. As a result, cracks and cracks occur in the base material or the porous sintered ceramics body, which makes production difficult.

[0005] Nevertheless, the above-mentioned ceramic porous sintered body has a permeability (sieving property) and an absorbing property by appropriately adjusting the pore size (pore size) of the sintered body in the pores. It is expected that the strength of the whole sintered body including the base material can be kept high,
Heretofore, the realization has been strongly desired.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned conventional technical problem. Porous sintered ceramic bodies having different pore diameters, porosity, etc. are formed in pores of a porous sintered ceramic base material by straining. It is an object of the present invention to provide a ceramic porous sintered body filled without generating cracks, cracks and the like. Another object of the present invention is to provide a method for producing the above-mentioned ceramic porous sintered body.

[0007]

Means for Solving the Problems To achieve the above object, a ceramic porous sintered body according to the present invention comprises a porous sintered ceramic base material having open spherical open pores in which pores communicate with each other. It is characterized in that the pores are filled with a porous sintered ceramic body in the form of particles bonded.

Here, it is desirable that the porosity of the porous sintered ceramic base material having the open spherical pores is in the range of 50 to 95% and the average pore diameter is in the range of 50 to 1000 μm. On the other hand, it is desirable that the porosity of the porous sintered ceramic body in the form of particles is in the range of 5 to 45% and the average pore diameter is in the range of 0.1 to 10 μm.

Further, the ceramic material constituting the porous sintered ceramic base material and / or the ceramic material constituting the porous sintered ceramic body in the form of particles bonded and sintered inside the open pores of the base material. It is desirable that the material is made of at least one selected from spinel, cordierite, alumina, zirconia, mullite, silica, hydroxyapatite, tricalcium phosphate and a composite thereof.

[0010] The porous sintered ceramic base material and the ceramic porous sintered body filled into the open pores of the base material and bonded to each other may be composed of the same type of ceramic raw material. It may be composed of different types of ceramic raw materials.

In order to achieve the above object, a method for producing a ceramic porous sintered body according to the present invention is characterized in that a porous sintered ceramic substrate having open spherical open pores in which pores communicate with each other is provided inside the open pores. A ceramic raw material slurry is injected, dried, and then fired in a premature sintering state so that the ceramic particles injected into the pores become a porous body in a particle-bonded form.

Here, the ceramic powder constituting the ceramic raw material slurry is a mixed powder of 100 parts by weight of fine particle powder having an average particle diameter of 3 μm or less and 30 to 2,000 parts by weight of coarse particle powder having an average particle diameter of 5 to 500 μm. Is desirable. Further, in the step of injecting the ceramic raw material slurry into the open pores of the porous sintered ceramic base material, after the base material is placed in a container under reduced pressure, the ceramic raw material slurry is introduced, and then pressurized. Is desirable.

Further, it is desirable to repeat the operations of reducing the pressure, introducing the raw material slurry, and pressing the porous sintered ceramic substrate. Further, the ceramic powder constituting the ceramic raw material slurry may include spinel, cordierite, alumina, zirconia, mullite, silica,
Desirably, it is composed of at least one selected from hydroxyapatite, tricalcium phosphate and a composite thereof.

The porous ceramic sintered body according to the present invention is, as described above, characterized in that the porous sintered ceramic base material is filled with the porous sintered ceramic body in the form of particles bonded inside the open pores. This is a structural feature. That is, in the ceramic porous sintered body according to the present invention, the porous sintered ceramic body in the form of particles bonded inside the open pores of the base material is filled in a state in which the sintered body is in close contact with the pore inner wall by sintering. . Therefore, the strength of the entire ceramic porous sintered body can be extremely increased.

Further, the pore diameter of the porous sintered ceramic base material and the porous sintered ceramic body in the form of particles bonded,
By suitably selecting and combining porosity, pore shape, and the like as desired, for example, it is suitably used for a filter, a lightweight structural material, a catalyst alone, a bioreactor, a separation membrane support, an artificial bone, a drug sustained release material, and the like. be able to. In particular, since the porous sintered ceramic body in the form of particles is bonded to the inside of the open pores of the porous sintered ceramic base material by sintering, for example, a member bonded with an adhesive such as an epoxy resin Not only is the strength higher than that of the above, but it is also excellent in heat resistance, chemical resistance, and high-temperature water resistance.

In general, it is difficult to join porous ceramic bodies having different pore structures, such as pore diameters and porosity, by sintering, since both shrink and deform during sintering. The porous body on the side to be filled greatly shrinks during its formation (for example, when the filled slurry is dried or fired), causing cracks and cracks, and easily peeling from the inner wall of the open pores of the substrate. .

According to the present invention, as a substrate, there is relatively little shrinkage, deformation, etc. when heated near the sintering temperature and good shape stability.
Moreover, by using a specific porous sintered ceramic base material having open spherical open pores and forming a porous sintered ceramic body in a form in which the sintered body filled and formed in the pores is bonded to a particle, Cracks and cracks are suppressed, and peeling of the base material from the inner wall of the open pores is suppressed.

Here, in the present invention, the porous sintered ceramic body in the form of particles bonded refers to a sintered body which has been fired at a relatively early stage of the sintering process (immature sintered state). Say. That is, in the sintering process between the solid particles, initially the particles and the particles are mainly fused to each other by point contact, but the contact area gradually expands, and the particles are fused by surface contact, The voids existing between the particles are gradually filled and reduced, and finally turned into a dense and unitary mass containing no pores. Therefore, specifically describing the sintered body in the form of bonded particles (immature sintered state) according to the present invention, the voids between the particles are communicated in a state where the particles are point-contact fused or surface-contact fused in the above process. It can be said that the sintering was completed in a state where the thus-formed open pores still remained in the structure.

The porous sintered ceramic body in such a state is characterized in that it has open pores in the structure and that shrinkage during sintering is relatively small. In particular, in the production process, the particle size of the raw material powder is adjusted, and the mixture of the coarse powder and the fine powder at an appropriate mixing ratio has a small shrinkage during drying and sintering, and the coarse particles have a premature sintering. In this state, a porous sintered body in a particle-bonded form in which many open pores formed by communicating voids between the coarse particles densely exist.

[0020]

Embodiments according to the present invention will be described below in more detail and specifically with reference to the drawings. FIG. 1 is a diagram schematically showing a porous structure of a porous sintered ceramic substrate used for a ceramic porous sintered body according to an embodiment of the present invention. FIG.
It is the figure which showed typically the porous structure of the porous sintered ceramics body of the particle-bonded form used for the ceramics porous sintered body concerning embodiment of this invention.

As shown in FIG. 1, this porous sintered ceramics base material A is a porous sintered ceramic substrate A in which a plurality of open pores 2 in which a large number of pores communicate with each other through an opening 3 are stretched three-dimensionally. It has a structure. Further, the skeleton wall portion 1 itself for partitioning the pores is made of, for example, a ceramic material having almost no fine open pores typically found in a conventional sintered body.

As described above, since the skeleton wall 1 of the porous sintered ceramic base material A is made of a ceramic material having almost no fine open pores, the same type of sintering wall having a large number of fine pores is used. Even when exposed to a high temperature near the sintering temperature, shrinkage or deformation is less than that of the consolidated body. Also,
If the macropore diameter (average) and porosity are almost equal,
The porous sintered ceramics base material A made of ceramics having almost no fine open pores in the skeleton wall 1 is
It is superior in strength characteristics to a porous sintered ceramic substrate made of ceramics having fine open pores formed in the skeleton wall.

The porous sintered ceramic substrate A of the present invention
Has a porosity in the range of 50 to 95%, particularly preferably 60
９０90%, the average pore diameter of which is 50-100
It is preferably in the range of 0 μm, particularly preferably in the range of 100 to 600 μm. When the porosity is less than 50, it becomes close to a dense sintered body, becomes too heavy in weight depending on applications such as lightweight structural materials, and has poor permeability or sufficient permeability depending on applications such as filters and catalyst carriers. A large amount of adsorption cannot be secured. On the other hand, if the porosity exceeds 95%, sufficient strength cannot be maintained.

When the pore diameter exceeds 1000 μm, the sintered body member having a small size (about several mm) cannot be sintered into a desired shape with high accuracy.
The strength is also insufficient. On the other hand, when it is less than 50 μm, in the case of applications such as artificial bone materials and sustained-release materials for drugs, it is difficult for cells and blood vessels to enter, resulting in insufficient bone tissue formation. In addition, at the time of production, it is also difficult to fill the inside of the porous sintered ceramic substrate with the raw material slurry.

Specific examples of the material of the porous sintered ceramic substrate A of the present invention include spinel, cordierite,
Alumina, zirconia, mullite, silica, silicon carbide,
Tricalcium phosphate, hydroxyapatite, oxyapatite, tetracalcium phosphate, and the like, and composites composed of these can be mentioned.

To produce the porous sintered ceramic substrate A, for example, the following method is used. That is, a ceramic slurry is prepared by dispersing a ceramic powder, a crosslinkable polymerizable substance, and the like in a solvent. To this ceramic slurry, a binder, a dispersant, a foam stabilizer, and the like are added, and a crosslinking agent is added to the obtained ceramic slurry, and the mixture is mechanically stirred and molded in a foamed state. The substance is gelled and cured. At this time, the bubble diameter and the like of the foamy slurry are controlled by adjusting the stirring intensity and the like. Then, the molded body is dried to remove the solvent,
After degreasing, sintering is performed to obtain a porous sintered ceramic substrate A.

Next, a description will be given of a porous sintered ceramic body in a form of particles bonded, which is sintered and filled in the pores of the substrate A. As shown in the schematic diagram of FIG. 2, the porous sintered ceramic body B is formed such that raw ceramic particles having a relatively large particle diameter maintain their spherical shape. That is, it is formed by forming the skeleton portion 10 in a particle-bonded form and partially bonding the particles to form a surface bond while leaving the inter-particle voids 11. The void 1
1 are formed as open pores communicating with each other.

The porous sintered ceramic body B in the form of particles bonded according to the present invention has a porosity in the range of 5 to 45%, particularly preferably 10 to 40%, and an average pore diameter of 0.1 to 40%. It is preferably in the range of 1 to 10 μm. When the porosity is less than 5%, it becomes close to a dense sintered ceramic body and has few open pores. Therefore, depending on the use of a filter, a catalyst carrier, a drug sustained-release material, etc., the permeability, filterability, adsorption amount and the like are not good. Not enough to use. On the other hand, the porosity is 45%
If it exceeds, sufficient strength cannot be maintained, and peeling, cracking, destruction and the like may occur.

If the porous sintered ceramic body B has an average pore diameter of more than 10 μm, it is difficult to form uniform pores, and sufficient filtering performance and sieving accuracy cannot be obtained. It is inappropriate to use On the other hand, those having an average pore diameter of less than 0.1 μm, when used as a filter, a drug sustained-release material or the like, have an extremely low filtration rate and permeation rate, and have insufficient strength. Therefore, the average pore diameter of the porous sintered ceramic body B is 0.1 μm to
It is preferably 10 μm.

Specific examples of the material of the porous sintered ceramics of the present invention in the form of particles bonded include spinel, cordierite, alumina, zirconia, mullite, silica, silicon carbide, tricalcium phosphate, and hydroxyapatite. , Oxyapatite, tetracalcium phosphate, and composites composed of these. The material of the ceramic constituting the base material A and the material of the ceramic constituting the sintered body B in the pores formed in the pores thereof may be the same or different from each other. It is appropriately selected depending on the function.

Next, a method of forming the above-mentioned ceramic porous sintered body B in the form of particles bonded will be described. In the manufacturing method according to the present invention, the slurry is injected and filled into the open pores 2 of the base material A, dried and fired to form the sintered body B. The slurry is prepared as follows. That is, for example, a dispersion medium (eg, pure water) is added to and mixed with a raw material powder pulverized using a ball mill or the like to form a slurry. The particle diameter of the raw material in this slurry is not particularly limited, but it is preferable that the average particle diameter is 3 μm or less. Further, a dispersant, a binder, a thickener and the like are added as necessary.

Further, the average particle diameter of the slurry is 5 to 5.
It is particularly preferable to mix coarse particles of 500 μm from the viewpoint of suppressing shrinkage of the porous sintered ceramic body during subsequent drying or sintering. The average particle diameter of the coarse particles is 5 μm
If it is less than 500 μm, drying and shrinkage during sintering due to the addition of coarse particles cannot be sufficiently suppressed, and if it exceeds 500 μm, the inside of the pores of the porous sintered ceramic base material A will not be filled. It will be difficult.

The amount of the coarse particles added is based on 100 parts by weight of the raw material powder contained in the slurry before the addition of the coarse particles.
It is preferably from 30 parts by weight to 2000 parts by weight. If the amount of the coarse particles is less than 30 parts by weight, the effect of suppressing shrinkage during drying and sintering by adding the coarse particles cannot be sufficiently obtained. On the other hand, if the amount of the coarse particles exceeds 2,000 parts by weight, the fluidity of the slurry is impaired and the filling operation becomes difficult.

In particular, the particle diameter of the coarse particles is preferably 50% or less of the average diameter of the pore openings (reference numeral 3 in FIG. 1) in the open spherical pores of the base material A. Is large, it becomes difficult to fill the slurry into the open pores of the substrate.

The thus prepared slurry containing coarse particles is filled into the open pores of the substrate. As a filling method, various methods such as pouring, injection by pressurization, and injection after decompression can be employed. Among these, a method of putting the base material in a container, depressurizing, introducing a slurry, injecting into pores, and then pressurizing is preferable.Furthermore, this depressurizing, slurry introducing, and pressurizing operations are repeated. Is particularly preferred.

Further, it is preferable to add a substance which gels due to cross-linking polymerization or temperature change to the slurry. This serves to prevent the slurry injected and filled into the pores of the base material from moving, thereby preventing the internal structure from becoming uneven. Examples of the substance that gels by such cross-linking polymerization include a combination of a polyfunctional epoxy compound and a polyfunctional amine, an aqueous solution of polyvinyl alcohol and an aqueous solution of glutaraldehyde with an acid catalyst, and the like. , Ovalbumin, gelatin and the like. A freeze-drying method can be given as a method having the same effect as the addition of the gelling substance.

As described above, after filling the inside of the open pores of the substrate with the slurry (after gelling when a substance that gels is added), it is dried. This step may be performed repeatedly. Then, it is sintered after drying. The sintering temperature is appropriately determined in consideration of the material of the base material A and the material of the ceramic porous sintered body B filled in the open pores.

FIG. 3 schematically shows the structure of the ceramic porous sintered body thus formed. As shown in FIG. 3, the ceramic porous sintered body is composed of a porous sintered ceramic base material A having open spherical pores 2 and a porous body having a particle-bonded form filled inside the open pores 2. And a sintered ceramic body B. This ceramic porous sintered body has many properties such as permeability (sieving property), absorbency, adsorptivity, adsorptive retention, chemical durability, sanitary harmlessness, strength characteristics, heat resistance, biocompatibility, etc. Due to its properties, by using ceramic materials suitable for each application,
Filters, lightweight structural materials, catalyst carriers, bioreactors,
It can be used as a support material for a separation membrane, an artificial bone, an artificial bone substitute, a sustained-release drug solution, and the like.

For example, as the filter material, alumina,
Sintered bodies composed of a number of ceramic materials such as zirconia, mullite, spinel, cordierite, silica, silicon carbide, and alumina, zirconia, bioglass, and calcium phosphate are used as artificial aggregates, artificial bone substitutes, and drug sustained-release materials. A sintered body made of a base material or the like is used. In particular, hydroxyapatite or tricalcium phosphate is effective among calcium phosphate-based materials for artificial bones, artificial bone filling materials, and drug sustained-release materials. For example, as a base material A, hydroxyapatite, tricalcium phosphate, or a composite thereof is used. It is preferable to use a material in which the porous sintered body B filled in the open pores is made of hydroxyapatite, tricalcium phosphate or a composite material thereof. Also,
For the lightweight structural material, the catalyst carrier, the bioreactor, the separation membrane support, and the like, a large number of ceramic materials can be used in addition to the above-described ceramic materials.

[0040]

EXAMPLES Example 1 Porous Alumina Sintered Body 100 parts by weight of alumina raw material powder having an average particle diameter of 0.4 μm, 10 parts by weight of ion-exchanged water as a dispersion medium, and ammonium polyacrylate as a dispersant. 0.8 parts by weight and 0.5 parts by weight of polyvinyl alcohol as a binder were added and mixed with a ball mill for 24 hours to form a slurry. To this slurry, 200 parts by weight of alumina coarse particles having an average particle diameter of 50 μm were added and mixed to prepare a filling slurry.

In this slurry, a porous sintered alumina substrate having an open spherical pore (average pore diameter 400 μm, porosity 75%, substrate size 10 mm × 10 mm × 60 mm) is immersed, and the pressure and pressure are reduced. The slurry was repeatedly filled into the open spherical pores. Then, the substrate was pulled out of the slurry, dried, and sintered at 1550 ° C. for 2 hours. The porosity of the porous sintered alumina body formed inside the pores of the substrate is 30%, the average pore diameter is 4 μm,
It had a particle-bonded morphology.

The three-point bending strength of the thus prepared sample of the porous ceramic sintered body was compared with that of the porous sintered ceramic base material not filled with pores.
The above sample has an average strength of 50 MPa, and the strength of the porous sintered ceramic base material not filled with the pores is 20 MPa.
It was found that the value greatly exceeded a.

"Example 2: Porous hydroxyapatite sintered body" 100 parts by weight of hydroxyapatite raw material powder having an average particle diameter of 1 µm, 60 parts by weight of ion exchange water as a dispersion medium, and 9 parts by weight of polyethyleneimine as a binder were added. Then, the mixture was mixed with a ball mill for two days to form a slurry. The average particle diameter of the particles in the slurry mixed with the ball mill was 0.5 μm. To this slurry, 100 parts by weight of hydroxyapatite coarse particles having an average particle diameter of 10 μm were added and mixed to prepare a filling slurry. Further, 3 parts by weight of sorbitol polyglycidyl ether capable of crosslinking and polymerizing with polyethyleneimine was added and mixed well.

Then, a porous sintered hydroxyapatite substrate having open spherical open pores (average pore diameter 180 μm,
A porosity of 75%, the size of a substrate (column); diameter of 10 mm x length of 50 mm) was reduced to a reduced pressure in a reduced pressure vessel, and the slurry was added to return to atmospheric pressure. Thereafter, the operation of decompression and atmospheric pressure release was repeated five times, and the apparatus was allowed to stand. After about 2 hours, gelation progressed and the fluidity was lost. After removing the slurry portion, the slurry was dried and sintered at 1200 ° C. for 1 hour. The porosity of the porous sintered ceramic body formed inside the pores of the substrate is 30%
The average pore diameter was 0.5 μm, and the particles were in a form of particles.

A sample of the thus prepared ceramic porous sintered body and a porous sintered ceramic base material having unfilled open spherical open pores were processed into a length of 10 mm.
Comparing the compressive strengths of the two samples, it was confirmed that the average of the sample of the ceramic porous sintered body was 45 MPa, which was much higher than the strength of the porous sintered ceramic base material having the unfilled open spherical open pores of 15 MPa. Was done.

[0046]

The ceramic porous sintered body of the present invention comprises:
Since the specific porous sintered ceramic body in the form of particles is filled into the open pores of the specific porous sintered ceramic base material having open spherical pores, there is no crack, crack, peeling, etc. It is firmly joined and has excellent strength. For this reason, ceramic materials suitable for each application can be suitably used for various filters, lightweight structural materials, catalyst carriers, bioreactors, separation membrane support materials, artificial bones, sustained drug release materials, and the like. Further, according to the method for producing a ceramic porous sintered body according to the present invention, the above ceramic porous sintered body can be easily obtained.

[Brief description of the drawings]

FIG. 1 is a diagram schematically showing a porous structure of a porous sintered ceramic substrate used in an embodiment of the present invention.

FIG. 2 is a diagram schematically showing a porous structure of a porous ceramic sintered body in a particle-bonded form used in an embodiment of the present invention.

FIG. 3 is a diagram schematically showing a structure of a ceramic porous sintered body according to an embodiment of the present invention.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 skeleton wall portion 2 open spherical open pores 3 opening 10 skeleton portion (in particle-bonded form) 11 void portion A porous sintered ceramic base material B porous sintered ceramic body

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Akihiko Ichikawa 30 Soya, Hadano-shi, Kanagawa Toshiba Ceramics Co., Ltd. In-house F term (reference) 4G019 GA02 GA04

Claims (11)

[Claims] 1. A porous sintered ceramic body having a particle-bonded form is filled in said open pores of a porous sintered ceramic base material having open spherical pores in which pores communicate with each other. Ceramic porous sintered body. 2. The porosity of the porous sintered ceramic base material having the open spherical open pores is in the range of 50 to 95%,
The ceramic porous sintered body according to claim 1, wherein the average pore diameter is in a range of 50 to 1000 µm. 3. The porosity of the porous sintered ceramics in the form of particles bonded is in the range of 5 to 45%, and the average pore diameter is in the range of 0.1 to 10 μm. The ceramic porous sintered body according to claim 1 or 2. 4. A ceramic material forming the porous sintered ceramic base material and / or a ceramic forming a particle-bonded porous sintered ceramic body sintered and filled inside the open pores of the base material. 4. The material according to claim 1, wherein the material is at least one selected from spinel, cordierite, alumina, zirconia, mullite, silica, hydroxyapatite, tricalcium phosphate, and a composite thereof. A ceramic porous sintered body described in any one of the above. 5. The method according to claim 1, wherein the porous sintered ceramic base material and the ceramic porous sintered body filled into the open pores of the base material and bonded to each other are made of the same kind of ceramic raw material. A ceramic porous sintered body according to any one of claims 1 to 4. 6. The porous sintered ceramic base material and the ceramic porous sintered body filled in particles and bonded to the inside of the open pores of the base material are made of different kinds of ceramic raw materials. The ceramic porous sintered body according to any one of claims 1 to 4. 7. A ceramic raw material slurry is injected into the open pores of a porous sintered ceramic substrate having open spherical open pores in which pores communicate with each other, and after drying, the ceramic particles injected into the pores are particles. A method for producing a ceramic porous sintered body, characterized in that the ceramic sintered body is fired in a premature sintering state so as to form a bonded porous body. 8. A ceramic powder constituting the ceramic raw material slurry, comprising a mixed powder of 100 parts by weight of a fine particle powder having an average particle diameter of 3 μm or less and 30 to 2,000 parts by weight of a coarse particle powder having an average particle diameter of 5 to 500 μm. A method for producing a ceramic porous sintered body according to claim 7, wherein: 9. In the step of injecting the ceramic raw material slurry into the open pores of the porous sintered ceramic base material, the base material is depressurized in a container, and then the ceramic raw material slurry is introduced. The method for producing a ceramic porous sintered body according to claim 7 or 8, wherein the method is performed by applying pressure. 10. The operations of depressurizing the porous sintered ceramic base material, introducing a ceramic raw material slurry, and pressurizing,
The method for producing a ceramic porous sintered body according to claim 9, wherein the method is repeated. 11. The ceramic powder constituting the ceramic raw material slurry comprises at least one selected from spinel, cordierite, alumina, zirconia, mullite, silica, hydroxyapatite, tricalcium phosphate, and a composite thereof. The method for producing a ceramic porous sintered body according to any one of claims 7 to 10, wherein: