Honeycomb ceramic unit body, honeycomb ceramic carrier, preparation method of honeycomb ceramic carrier and tail gas catalysis core body

Abstract

The invention provides a honeycomb ceramic unit body, a honeycomb ceramic carrier, a preparation method of the honeycomb ceramic carrier and a tail gas catalysis core body. The porosity of the honeycomb ceramic unit body is 55-65%, the thermal diffusion coefficient is larger than or equal to 6 mm < 2 > / s, and the shrinkage rate is smaller than 5%. The invention provides the honeycomb ceramic unit body which is proper in porosity, large enough in thermal diffusion coefficient and small in shrinkage rate, the honeycomb ceramic carrier composed of the unit body and the tail gas catalysis core body composed of the honeycomb ceramic carrier.

Description

Technical Field

[0001] The invention relates to the field of honeycomb ceramic carriers, and in particular to a honeycomb ceramic unit body, a honeycomb ceramic carrier and a preparation method thereof, and an exhaust gas catalytic core. Background Art

[0002] At present, the mainstream filter materials on the market are mainly cordierite, aluminum titanate, mullite, silicon carbide, etc. The cordierite material generally has a maximum temperature resistance of no more than 1300°C, and the operating temperature is relatively low. The aluminum titanate filter has low mechanical strength, fragile packaging, and is easily decomposed into titanium dioxide, which causes the product's thermal expansion coefficient to increase rapidly and cracks. Mullite material also has the characteristics of high CTE and easy production of pollutants such as chlorides and fluorides. For porous ceramics made of silicon carbide, its high temperature strength can be maintained above 1600°C, completely avoiding the potential risks of filters made of other materials, and is more adaptable to the harsh working conditions during the use of diesel vehicles. The silicon bonding method is a mainstream method for preparing silicon carbide honeycomb ceramics. However, the products prepared by the silicon bonding method have many problems such as large shrinkage, difficulty in maintaining the shape of the finished product, and low thermal diffusion coefficient, which easily leads to uneven temperature distribution. Especially when the porosity increases to more than 60%, the shrinkage rate is often greater than 5%, and the thermal diffusion coefficient is often less than 6mm. 2 / s.

[0003] Therefore, there is an urgent need for a honeycomb ceramic carrier with a suitable porosity, a sufficiently large thermal diffusion coefficient and a relatively small shrinkage rate to meet the needs of exhaust gas catalytic filtration. Summary of the invention

[0004] The object of the present invention is to provide a honeycomb ceramic unit body, a honeycomb ceramic carrier and a preparation method thereof, and an exhaust gas catalytic core, thereby obtaining a honeycomb ceramic unit body with appropriate porosity, sufficiently large thermal diffusion coefficient and relatively small shrinkage rate, a honeycomb ceramic carrier composed of the unit body, and an exhaust gas catalytic core composed of the honeycomb ceramic carrier.

[0005] To achieve the above object, the present invention provides the following technical solutions:

[0006] A honeycomb ceramic unit body, wherein the porosity of the honeycomb ceramic unit body is 55-65%, and the thermal diffusion coefficient is greater than or equal to 6mm 2 / s, and the shrinkage rate in each direction is less than or equal to 4%.

[0007] In some embodiments of the present invention, the porosity of the honeycomb ceramic unit body is 57-63%, and the thermal diffusion coefficient is greater than or equal to 7 mm 2 / s, and the shrinkage rate in each direction is less than 3.5%.

[0008] In some embodiments of the present invention, the shrinkage rate of the honeycomb ceramic unit body in the height direction is 0.5-4%, the shrinkage rate in the length direction is 1-4%, the shrinkage rate in the width direction is 1-4%, and the compressive strength of the longitudinal axis is 2-8 MPa;

[0009] Preferably, the shrinkage rate of the honeycomb ceramic unit body in the height direction is 0.5-2%, the shrinkage rate in the length direction is 1-3.5%, the shrinkage rate in the width direction is 1-3%, and the compressive strength of the longitudinal axis is 3-7.5 MPa.

[0010] In some embodiments of the present invention, the raw materials of the honeycomb ceramic unit body include silicon carbide powder, silicon powder, alkaline earth metal oxide, clay, binder, pore former and lubricant.

[0011] In some embodiments of the present invention, the raw materials of the honeycomb ceramic unit body include 75-85 parts by weight of silicon carbide powder, 15-25 parts by weight of silicon powder, 0.2-2 parts by weight of alkaline earth metal oxide, 0.5-1.5 parts by weight of clay, 15-25 parts by weight of binder, 25-35 parts by weight of pore former, 20-70 parts by weight of water and 2-15 parts by weight of lubricant;

[0012] Preferably, the raw materials of the honeycomb ceramic unit body include 75 to 85 parts by weight of silicon carbide powder, 15 to 25 parts by weight of silicon powder, 1.2 to 2 parts by weight of alkaline earth metal oxides, 0.5 to 1.5 parts by weight of clay, 15 to 25 parts by weight of a binder, 25 to 35 parts by weight of a pore former, 30 to 60 parts by weight of water and 3 to 10 parts by weight of a lubricant.

[0013] In some embodiments of the present invention, the silicon carbide powder includes a primary silicon carbide powder having a D50 of 15 to 50 μm and a secondary silicon carbide powder having a D50 of 1 to 12 μm;

[0014] Preferably, the D50 of the primary silicon carbide powder is 20 to 45 μm, and the D50 of the secondary silicon carbide powder is 2 to 10 μm.

[0015] In some embodiments of the present invention, the mass ratio of the primary silicon carbide powder to the secondary silicon carbide powder is (65-80):(2-15);

[0016] Preferably, the mass ratio of the primary silicon carbide powder to the secondary silicon carbide powder is (65-80):(5-15).

[0017] In some embodiments of the present invention, the alkaline earth metal oxide is selected from at least one of magnesium oxide, beryllium oxide, strontium oxide, calcium oxide, and barium oxide.

[0018] In some embodiments of the present invention, the binder is selected from at least one of polyvinyl alcohol, glycerol, ethyl cellulose, polyethylene glycol, methyl cellulose, potassium laurate and carboxymethyl cellulose.

[0019] In some embodiments of the present invention, the clay is selected from at least one of kaolin, bentonite, montmorillonite, diatomaceous earth, perlite, illite and lithosphere.

[0020] In some embodiments of the present invention, the mass fraction of oxides in the raw materials of the honeycomb ceramic unit body is less than 3%, preferably less than 2.6%, wherein the mass fraction of oxides is the sum of the mass fractions of alkaline earth metal oxides and oxides in clay.

[0021] In some embodiments of the present invention, the pore-forming agent is selected from at least one of walnut powder, graphite, benzoic acid, starch, ammonium bicarbonate, ammonium chloride, polymethyl methacrylate, and expanded microspheres;

[0022] And / or, the lubricant is glycerol.

[0023] In some embodiments of the present invention, the particle size D50 of the pore former is 5 to 40 μm, preferably 10 to 30 μm.

[0024] In order to achieve the above object, the present invention also provides the following technical solutions:

[0025] A method for preparing the above honeycomb ceramic unit body, the method comprising the following steps:

[0026] S11, dry-mixing silicon carbide powder, pure silicon powder, alkaline earth metal oxide, clay, a binder, and a pore-forming agent;

[0027] S12, adding water and lubricant to the mixture obtained in step S11, and wet mixing;

[0028] S13, kneading the mixture obtained in step S12;

[0029] S14, extruding the mixture obtained in step S13;

[0030] S15. The mixture obtained in step S14 is microwave dried and sintered to obtain the honeycomb ceramic unit body.

[0031] In some embodiments of the present invention, the method has one or more of the following features:

[0032] In the step S11, a high-speed mixer is used for dry mixing, the dry mixing speed is 60 to 90 rpm, and the dry mixing time is 10 to 30 minutes. Preferably, the dry mixing speed is 80 rpm, and the dry mixing time is 15 minutes;

[0033] In step S12, the wet mixing speed is 60-90 rpm, and the wet mixing time is 2-30 min. Preferably, the wet mixing speed is 80 rpm, and the wet mixing time is 5 min.

[0034] In the step S13, a biaxial kneading machine is used for kneading, and the kneading time is 10 to 20 minutes, preferably, the kneading time is 10 to 20 minutes, preferably 15 minutes;

[0035] In the step S14, an extruder is used for extrusion molding, and the extrusion pressure is 5 to 12 MPa, preferably, the extrusion pressure is 6 to 10 MPa;

[0036] In step S15, the microwave drying time is 20 to 40 minutes, preferably 30 minutes.

[0037] In order to achieve the above object, the present invention also provides the following technical solutions:

[0038] A honeycomb ceramic carrier is composed of the honeycomb ceramic unit body mentioned above or the honeycomb ceramic unit body obtained by the above method.

[0039] In order to achieve the above object, the present invention also provides the following technical solutions:

[0040] A method for preparing the above-mentioned honeycomb ceramic carrier comprises the following steps:

[0041] S1, preparing the above-mentioned honeycomb ceramic unit body;

[0042] S2, splicing the honeycomb ceramic unit bodies to obtain a rough blank;

[0043] S3, adding a splicing material to the splicing seam of the rough blank obtained in step S2 to obtain a blank;

[0044] S4, grinding the periphery and end surface of the blank obtained in step S3 to obtain a blank;

[0045] S5, skinning the green body obtained in step S4, and drying it to obtain the honeycomb ceramic carrier.

[0046] In order to achieve the above object, the present invention also provides the following technical solutions:

[0047] An exhaust gas catalytic core, the exhaust gas catalytic core comprising:

[0048] The above honeycomb ceramic unit body, or the honeycomb ceramic unit body obtained by the above method, or the above honeycomb ceramic carrier, or the honeycomb ceramic carrier obtained by the above method; and

[0049] A catalyst is coated on the partition walls of the internal cells of the honeycomb ceramic unit body.

[0050] Further areas of applicability will become apparent from the description provided in the present disclosure.

[0051] The description and specific examples in this summary are intended for purposes of illustration only and are not intended to limit the scope of the present disclosure.

[0052] Compared with the prior art, the technical solution provided by the present invention has the following beneficial effects:

[0053] The present invention provides a honeycomb ceramic unit body, a honeycomb ceramic carrier and a preparation method thereof, and an exhaust gas catalytic core body, and obtains a honeycomb ceramic unit body with appropriate porosity, sufficiently large thermal diffusion coefficient, and relatively small shrinkage rate, a honeycomb ceramic carrier composed of the unit body, and an exhaust gas catalytic core body composed of the honeycomb ceramic carrier; specifically, the honeycomb ceramic carrier provided by the present invention has a porosity of 55-65%, a thermal diffusion coefficient greater than or equal to 6mm 2 / s, and the shrinkage rate in each direction is less than or equal to 4%, which can meet the needs of exhaust gas catalytic filtration. BRIEF DESCRIPTION OF THE DRAWINGS

[0054] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some implementation plans of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without paying any creative work.

[0055] Figure 1 A flowchart of a method for preparing a honeycomb ceramic carrier provided in one embodiment of the present invention.

[0056] Figure 2 A schematic structural diagram of a honeycomb ceramic unit body provided in another embodiment of the present invention. DETAILED DESCRIPTION

[0057] The technical solutions in the embodiments of the present invention are described clearly and completely below. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments in the present invention, all other embodiments obtained by those skilled in the art without creative work belong to the scope of protection of the present invention. It should be understood that the specific embodiments described herein are only used to illustrate and explain the present invention, and are not used to limit the present invention.

[0058] Any specific numerical value disclosed herein (including the endpoint of the numerical range) is not limited to the exact value of the numerical value, but should be understood to also cover values ​​close to the exact value, such as all possible numerical values ​​within the range of ±5% of the exact value. In addition, for the disclosed numerical range, the endpoint values ​​of the range, the endpoint values ​​and the specific point values ​​in the range, and the specific point values ​​can be arbitrarily combined to obtain one or more new numerical ranges, and these new numerical ranges should also be regarded as specifically disclosed herein.

[0059] The terms used in the present disclosure are only intended to describe specific exemplary embodiments and are not intended to be limiting. Unless the context clearly indicates otherwise, the singular forms "one", "a kind of" and "the" as used in the present disclosure may be intended to also include plural forms. The terms "comprise", "include", "contain" and "have" are inclusive, thus illustrating the presence of the features, elements, compositions, steps, integers, operations and / or components, but do not exclude the presence or addition of one or more other features, integers, steps, operations, elements, components and / or their collections. Although the open term "comprise" should be understood as a non-limiting term for describing and claiming the various embodiments described in the present disclosure, in some aspects, the term may be alternatively understood as a more restrictive and limited term, such as "consisting of..." or "consisting essentially of..." Thus, for any given embodiment of a narration composition, material, component, element, feature, integer, operation and / or process step, the present disclosure also particularly includes an embodiment consisting of or essentially consisting of such a composition, material, component, element, feature, integer, operation and / or process step. In the case of “consisting of,” alternative embodiments exclude any additional compositions, materials, components, elements, features, integers, operations and / or process steps, while in the case of “consisting essentially of,” any additional compositions, materials, components, elements, features, integers, operations and / or process steps that materially affect the basic and novel characteristics are excluded from such embodiments, but any compositions, materials, components, elements, features, integers, operations and / or process steps that do not materially affect the basic and novel characteristics may be included in the embodiments.

[0060] Any method steps, processes, and operations described in the present disclosure should not be construed as necessarily requiring their performance in the particular order discussed or illustrated, unless expressly identified as a certain order of performance. It should also be understood that additional or alternative steps may be used unless otherwise stated.

[0061] In this application, except for the contents explicitly described, any matters or items not mentioned are directly applicable to those known in the art without any changes. Moreover, any embodiment described in this disclosure can be freely combined with one or more other embodiments described in this disclosure, and the technical solutions or technical ideas formed thereby are regarded as part of the original disclosure or original record of this application, and should not be regarded as new contents that have not been disclosed or anticipated in this disclosure, unless a person skilled in the art considers that the combination is obviously unreasonable.

[0062] Unless otherwise specified, the terms used herein have the same meaning as commonly understood by those skilled in the art. If a term is defined herein and its definition is different from the commonly understood meaning in the art, the definition herein shall prevail.

[0063] Unless otherwise stated, when % is mentioned herein, it means wt. %.

[0064] First aspect

[0065] See also Figure 2 A honeycomb ceramic unit body, the porosity of the honeycomb ceramic unit body is 55-65%, and the thermal diffusion coefficient is greater than or equal to 6mm 2 / s, and the shrinkage rate in each direction is less than or equal to 4%.

[0066] It is worth noting that the current technology does not mention both a shrinkage rate of less than 4% and a thermal diffusion coefficient of more than 6mm. 2 / s silicon carbide unit body preparation method, the present invention provides a silicon carbide unit body which can have high thermal diffusion coefficient and low shrinkage and its preparation method.

[0067] In some embodiments of the present invention, the porosity of the honeycomb ceramic unit body is 57-63%, and the thermal diffusion coefficient is greater than or equal to 7 mm 2 / s, and the shrinkage rate in each direction is less than 3.5%.

[0068] In the context of the present invention, porosity refers to the percentage of the volume of pores contained in the product to the total volume of the product.

[0069] In the context of the present invention, thermal diffusivity is the ratio of thermal conductivity to volumetric heat capacity, where volumetric heat capacity is the product of density and specific heat capacity.

[0070] In the context of the present invention, the shrinkage rate in each direction includes the shrinkage rate in the height direction, the shrinkage rate in the length direction and the shrinkage rate in the width direction of the honeycomb ceramic unit body.

[0071] See also Figure 2 In the figure, L1 is the height direction of the honeycomb ceramic unit body, L2 is the length direction of the honeycomb ceramic unit body, and L3 is the width direction of the honeycomb ceramic unit body.

[0072] In some embodiments of the present invention, the shrinkage rate of the honeycomb ceramic unit body in height direction is 0.5-4%, in length direction is 1-4%, in width direction is 1-4%, and the longitudinal axis compressive strength is 2-8 MPa.

[0073] In some embodiments of the present invention, the shrinkage rate of the honeycomb ceramic unit body in height direction is 0.5-2%, in length direction is 1-3.5%, in width direction is 1-3%, and the longitudinal axis compressive strength is 3-7.5 MPa.

[0074] In some embodiments of the present invention, the raw materials of the honeycomb ceramic unit body include silicon carbide powder, silicon powder, alkaline earth metal oxide, clay, binder, pore former and lubricant. It is worth noting that the raw material ratio is improved by adding part of silicon powder to improve the thermal diffusion coefficient and mechanical strength of the product, and at the same time, the proportion of silicon is controlled at 17% to 34% of the silicon carbide powder, which can ensure that the shrinkage rate in all directions is less than 4%; at the same time, the product is prepared by a silicon bonding method that matches the raw materials. Compared with the recrystallization method, the sintering temperature is about 1000°C lower, the energy consumption is lower, and the thermal diffusion performance and shrinkage rate of the product are better than those of the products prepared by the conventional silicon bonding method.

[0075] In some embodiments of the present invention, the raw materials of the honeycomb ceramic unit body include 75 to 85 parts by weight of silicon carbide powder, 15 to 25 parts by weight of silicon powder, 0.2 to 2 parts by weight of alkaline earth metal oxides, 0.5 to 1.5 parts by weight of clay, 15 to 25 parts by weight of a binder, 25 to 35 parts by weight of a pore former, 20 to 70 parts by weight of water and 2 to 15 parts by weight of a lubricant.

[0076] In some embodiments of the present invention, the raw materials of the honeycomb ceramic unit body include 75 to 85 parts by weight of silicon carbide powder, 15 to 25 parts by weight of silicon powder, 1.2 to 2 parts by weight of alkaline earth metal oxides, 0.5 to 1.5 parts by weight of clay, 15 to 25 parts by weight of a binder, 25 to 35 parts by weight of a pore former, 30 to 60 parts by weight of water and 3 to 10 parts by weight of a lubricant.

[0077] In some embodiments of the present invention, the silicon carbide powder includes a primary silicon carbide powder having a D50 of 15 to 50 μm and a secondary silicon carbide powder having a D50 of 1 to 12 μm.

[0078] In some embodiments of the present invention, the D50 of the primary silicon carbide powder is 20-45 μm, and the D50 of the secondary silicon carbide powder is 2-10 μm. It is worth noting that the raw material is selected as a more common small-particle powder for particle grading, and a honeycomb ceramic unit body with a lower shrinkage rate is prepared. Ultrafine silicon carbide powder with a particle size of less than 1 μm is not used to fill the gaps between large particles. The preparation cost is lower and it is more suitable for industrial production.

[0079] In some embodiments of the present invention, the mass ratio of the primary silicon carbide powder to the secondary silicon carbide powder is (65-80):(2-15).

[0080] In some embodiments of the present invention, the mass ratio of the primary silicon carbide powder to the secondary silicon carbide powder is (65-80):(5-15).

[0081] In some embodiments of the present invention, the alkaline earth metal oxide is selected from at least one of magnesium oxide, beryllium oxide, strontium oxide, calcium oxide, and barium oxide.

[0082] In some embodiments of the present invention, the binder is selected from at least one of polyvinyl alcohol, ethyl cellulose, polyethylene glycol, methyl cellulose, potassium laurate and carboxymethyl cellulose.

[0083] In some embodiments of the present invention, the clay is selected from at least one of kaolin, bentonite, montmorillonite, diatomaceous earth, perlite, illite and lithosphere.

[0084] In some embodiments of the present invention, the mass fraction of the oxide in the raw material of the honeycomb ceramic unit body is less than 3%, preferably less than 2.6%, wherein the mass fraction of the oxide is the sum of the mass fractions of the alkaline earth metal oxide and the oxide in the clay. It is worth noting that the oxide used in the present invention only contains alkali metal oxides and clay, and the oxide content in the raw material is controlled at a low level. During the preparation and sintering process, the generation of oxides other than silicon oxide is controlled. A higher oxide content will lead to a higher thermal expansion coefficient. At the same time, the thermal diffusion coefficient of the oxide is much lower than that of silicon carbide crystals. Effectively controlling the oxide content can increase the thermal diffusion coefficient of the unit body.

[0085] In some embodiments of the present invention, the pore-forming agent is selected from at least one of walnut powder, graphite, benzoic acid, starch, ammonium bicarbonate, ammonium chloride, polymethyl methacrylate, and expanded microspheres.

[0086] In some embodiments of the present invention, the lubricant is glycerol.

[0087] In some embodiments of the present invention, the particle size D50 of the pore former is 5 to 40 μm, preferably 10 to 30 μm.

[0088] It is worth noting that, in some embodiments of the present invention, the honeycomb ceramic unit body is used for exhaust gas purification, specifically, it can be used to purify the gas generated by the combustion or incomplete combustion of substances such as diesel.

[0089] Second aspect

[0090] The present invention provides a method for preparing the above-mentioned honeycomb ceramic unit body, which comprises the following steps: S11, dry mixing silicon carbide powder, pure silicon powder, alkaline earth metal oxide, clay, binder and pore-forming agent; S12, adding water and lubricant to the mixture obtained in step S11, and wet mixing; S13, kneading the mixture obtained in step S12; S14, extruding the mixture obtained in step S13; S15. Microwave drying and sintering the mixture obtained in step S14 to obtain the honeycomb ceramic unit body.

[0091] In some embodiments of the present invention, in step S11, a high-speed mixer is used for dry mixing, the dry mixing speed is 60-90 rpm, and the dry mixing time is 10-30 min. Preferably, the dry mixing speed is 80 rpm, and the dry mixing time is 15 min.

[0092] In some embodiments of the present invention, in step S12, the wet mixing speed is 60-90 rpm, and the wet mixing time is 2-30 min. Preferably, the wet mixing speed is 80 rpm, and the wet mixing time is 5 min.

[0093] In some embodiments of the present invention, in step S13, a biaxial kneading machine is used for kneading, and the kneading time is 10 to 20 minutes. Preferably, the kneading time is 10 to 20 minutes, preferably 15 minutes.

[0094] In some embodiments of the present invention, in step S14, an extruder is used for extrusion molding, and the extrusion pressure is 5 to 12 MPa, preferably, the extrusion pressure is 6 to 10 MPa.

[0095] In some embodiments of the present invention, in step S15, the microwave drying time is 20 to 40 minutes, preferably 30 minutes.

[0096] The third aspect

[0097] The present invention provides a honeycomb ceramic carrier, which is composed of a plurality of the above-mentioned honeycomb ceramic unit bodies or honeycomb ceramic unit bodies obtained by the above-mentioned method.

[0098] The fourth aspect

[0099] See also Figure 1The present invention provides a method for preparing the above-mentioned honeycomb ceramic carrier, comprising the following steps: S1, preparing a unit body; S2, splicing the unit bodies to obtain a rough blank; S3, adding a splicing material to the splicing seam of the rough blank obtained in step S2 to obtain a blank; S4, grinding the periphery and end surface of the blank obtained in step S3 to obtain a blank; S5, skinning the blank obtained in step S4, drying, to obtain the honeycomb ceramic carrier.

[0100] In some embodiments of the present invention, in step S3, the thickness of the joint seam is 1 to 5 mm.

[0101] In some embodiments of the present invention, in step S5, the thickness of the skin graft layer is 1 to 5 mm.

[0102] Fifth Aspect

[0103] The present invention also provides an exhaust gas catalytic core, which includes: the above-mentioned honeycomb ceramic unit body, or the honeycomb ceramic unit body prepared by the above-mentioned method, or the above-mentioned honeycomb ceramic carrier, or the honeycomb ceramic carrier obtained by the above-mentioned method; and a catalyst coated on the partition wall of the internal compartment of the honeycomb ceramic unit body.

[0104] It is understandable that the exhaust gas catalytic core provided by the present invention can be used in the field of exhaust gas or waste gas purification catalytic treatment, and more specifically can be used for purifying catalytic treatment of waste gas generated after incomplete combustion of diesel.

[0105] Example 1

[0106] This embodiment provides a honeycomb ceramic unit body with high porosity, high thermal conductivity and low shrinkage. The honeycomb ceramic unit body is in the shape of a cuboid. A plurality of honeycomb ceramic unit bodies are adjacently spliced ​​to form a honeycomb ceramic carrier with a roughly circular cross-section. The raw materials of the honeycomb ceramic unit body include, by weight: 80 parts of silicon carbide powder, 20 parts of elemental silicon powder, 1.5 parts of alkaline earth metal oxide, 0.8 parts of clay, 20.5 parts of binder and 30 parts of pore-forming agent. In the honeycomb ceramic unit body, alkaline earth metal The metal oxides are 0.5 parts of calcium oxide and 1 part of beryllium oxide; in the honeycomb ceramic unit body, the clay is 0.8 parts of kaolin; in the honeycomb ceramic unit body, the binder is 10 parts of hydroxymethyl cellulose, 5 parts of polyvinyl alcohol, 3 parts of glycerol and 2.5 parts of potassium laurate; in the honeycomb ceramic unit body, the pore-forming agent is 14 parts of starch and 16 parts of walnut powder; in the honeycomb ceramic unit body, 78 parts of silicon carbide powder with D50=20μm and 2 parts of silicon carbide powder with D50=7μm are used.

[0107] The preparation method is as follows: 1) preparing the above honeycomb ceramic unit body: a) adding alkaline earth metal oxide, clay, silicon carbide powder, silicon powder, pore former and binder together into a high-speed mixer and mixing at high speed for 15 minutes; b) adding water and lubricant and continuing high-speed mixing for 5 minutes; c) adding the raw material mixture obtained in step b) into a biaxial kneader and kneading for 10 minutes; d) adding the raw material mixture obtained in step c) into an extruder and extruding; e) drying with microwaves and sintering to obtain a unit body;

[0108] 2) splicing the unit bodies, assembling the above honeycomb ceramic unit bodies into a green body of suitable size according to the carrier specifications; 3) adding splicing materials into the splicing seams of the above green bodies to obtain a whole composed of the spliced ​​unit bodies;

[0109] 4) grinding the entire periphery and end faces of the assembled honeycomb ceramic unit bodies to obtain honeycomb ceramic blanks of suitable size and shape; 5) grafting and drying the silicon carbide honeycomb ceramic blanks to obtain the honeycomb ceramic carriers.

[0110] Example 2

[0111] This embodiment provides a honeycomb ceramic unit body with high porosity, high thermal conductivity and low shrinkage. The honeycomb ceramic unit body is in the shape of a cuboid. A plurality of honeycomb ceramic unit bodies are adjacently spliced ​​to form a honeycomb ceramic carrier with a roughly circular cross-section. The raw materials of the honeycomb ceramic unit body include, by weight: 85 parts of silicon carbide powder, 15 parts of elemental silicon powder, 1.2 parts of alkaline earth metal oxide, 0.7 parts of clay, 18 parts of binder and 25 parts of pore-forming agent. In the honeycomb ceramic unit body, alkaline earth metal The oxide is 1.2 parts of magnesium oxide; in the honeycomb ceramic unit body, the clay is 0.2 parts of bentonite, 0.4 parts of montmorillonite, and 0.1 parts of tallow; in the honeycomb ceramic unit body, the binder is 9 parts of hydroxymethyl cellulose and 9 parts of ethyl cellulose; in the honeycomb ceramic unit body, the pore-forming agent is 12 parts of starch, 10 parts of walnut powder and 3 parts of benzoic acid; in the honeycomb ceramic unit body, 80 parts of silicon carbide powder with D50=25μm and 5 parts of silicon carbide powder with D50=4μm are used.

[0112] The preparation method is the same as that in Example 1.

[0113] Example 3

[0114] This embodiment provides a honeycomb ceramic unit body with high porosity, high thermal conductivity and low shrinkage. The honeycomb ceramic unit body is in the shape of a rectangular parallelepiped. A plurality of honeycomb ceramic unit bodies are adjacently spliced ​​to form a honeycomb ceramic carrier with a roughly circular cross-section. The raw materials of the honeycomb ceramic unit body include, by weight: 81 parts of silicon carbide powder, 19 parts of elemental silicon powder, 1.4 parts of alkaline earth metal oxide, 0.8 parts of clay, 22 parts of binder and 27.5 parts of pore-forming agent. In the honeycomb ceramic unit body, the alkaline earth metal oxide is 0.5 parts of strontium oxide, 0.5 parts of beryllium oxide and 0.4 parts of barium oxide; in the honeycomb ceramic unit body, the clay is 0.8 parts of illite; in the honeycomb ceramic unit body, the binder is 11 parts of hydroxymethyl cellulose, 3 parts of methyl cellulose and 7 parts of potassium laurate; in the honeycomb ceramic unit body, the pore-forming agent is 13 parts of benzoic acid, 11 parts of graphite and 3.5 parts of ammonium chloride; in the honeycomb ceramic unit body, 66 parts of silicon carbide powder with D50=45μm and 15 parts of silicon carbide powder with D50=10μm are used.

[0115] The preparation method is the same as that in Example 1.

[0116] Example 4

[0117] This embodiment provides a honeycomb ceramic unit body with high porosity, high thermal conductivity and low shrinkage. The honeycomb ceramic unit body is in the shape of a cuboid. A plurality of honeycomb ceramic unit bodies are adjacently spliced ​​to form a honeycomb ceramic carrier with a roughly circular cross-section. The raw materials of the honeycomb ceramic unit body include, by weight: 78 parts of silicon carbide powder, 22 parts of silicon powder, 1.2 parts of alkaline earth metal oxide, 1.5 parts of clay, 18 parts of binder and 25 parts of pore-forming agent. In the honeycomb ceramic unit body, the alkaline earth metal oxide The compounds include 0.5 parts of barium oxide, 0.5 parts of magnesium oxide and 0.2 parts of beryllium oxide; in the honeycomb ceramic unit body, the clay includes 0.5 parts of perlite and 1 part of diatomaceous earth; in the honeycomb ceramic unit body, the binder includes 9 parts of propylene glycol, 4 parts of polyethylene glycol and 5 parts of potassium laurate; in the honeycomb ceramic unit body, the pore-forming agent includes 25 parts of expanded microspheres; in the honeycomb ceramic unit body, 65 parts of silicon carbide powder with D50=30μm and 13 parts of silicon carbide powder with D50=2μm are used.

[0118] The preparation method is the same as that in Example 1.

[0119] Example 5

[0120] This embodiment provides a honeycomb ceramic unit body with high porosity, high thermal conductivity and low shrinkage. The honeycomb ceramic unit body is in the shape of a cuboid. A plurality of honeycomb ceramic unit bodies are adjacently spliced ​​to form a honeycomb ceramic carrier with a roughly circular cross-section. The raw materials of the honeycomb ceramic unit body include, by weight: 75 parts of silicon carbide powder, 25 parts of silicon powder, 1.1 parts of alkaline earth metal oxide, 0.8 parts of clay, 18 parts of binder and 26 parts of pore-forming agent. In the honeycomb ceramic unit body, alkaline earth metal oxide 0.5 parts of magnesium oxide and 0.6 parts of calcium oxide are used; in the honeycomb ceramic unit body, the clay is 0.3 parts of perlite and 0.5 parts of illite; in the honeycomb ceramic unit body, the binder is 9 parts of methyl cellulose and 9 parts of ethyl cellulose; in the honeycomb ceramic unit body, the pore-forming agent is 12 parts of graphite, 10 parts of walnut powder and 4 parts of polymethyl methacrylate; in the honeycomb ceramic unit body, 70 parts of silicon carbide powder with D50=32μm and 5 parts of silicon carbide powder with D50=6μm are used.

[0121] The preparation method is the same as that in Example 1.

[0122] Example 6

[0123] This embodiment provides a honeycomb ceramic unit body with high porosity, high thermal conductivity and low shrinkage. The honeycomb ceramic unit body is in the shape of a rectangular parallelepiped. A plurality of honeycomb ceramic unit bodies are adjacently spliced ​​to form a honeycomb ceramic carrier with a roughly circular cross-section. The raw materials of the honeycomb ceramic unit body include, by weight: 79 parts of silicon carbide powder, 21 parts of silicon powder, 1.5 parts of alkaline earth metal oxide, 0.5 parts of clay, 18 parts of binder and 25 parts of pore-forming agent. In the honeycomb ceramic unit body, alkaline earth metal The oxide is 1.5 parts of barium oxide; in the honeycomb ceramic unit body, the clay is 0.2 parts of tallow and 0.3 parts of montmorillonite; in the honeycomb ceramic unit body, the binder is 13 parts of ethyl cellulose, 3 parts of glycerol and 2 parts of potassium laurate; in the honeycomb ceramic unit body, the pore-forming agent is 12 parts of benzoic acid, 10 parts of graphite and 3 parts of ammonium bicarbonate; in the honeycomb ceramic unit body, 70 parts of silicon carbide powder with D50=28μm and 9 parts of silicon carbide powder with D50=5μm are used.

[0124] The preparation method is the same as that in Example 1.

[0125] Example 7

[0126] This embodiment provides a honeycomb ceramic unit body with high porosity, high thermal conductivity and low shrinkage. The honeycomb ceramic unit body is in the shape of a cuboid. A plurality of honeycomb ceramic unit bodies are adjacently spliced ​​to form a honeycomb ceramic carrier with a roughly circular cross-section. The raw materials of the honeycomb ceramic unit body include, by weight: 78 parts of silicon carbide powder, 22 parts of silicon powder, 1.5 parts of alkaline earth metal oxide, 0.5 parts of clay, 15 parts of binder and 25 parts of pore-forming agent. In the honeycomb ceramic unit body, the alkaline earth metal oxide The chemical compound is 1.5 parts of barium oxide; in the honeycomb ceramic unit body, the clay is 0.2 parts of kaolin and 0.3 parts of montmorillonite; in the honeycomb ceramic unit body, the binder is 10 parts of ethyl cellulose, 3 parts of glycerol and 2 parts of potassium laurate; in the honeycomb ceramic unit body, the pore-forming agent is 12 parts of walnut powder, 10 parts of graphite and 3 parts of ammonium bicarbonate; in the honeycomb ceramic unit body, 70 parts of silicon carbide powder with D50=29μm and 8 parts of silicon carbide powder with D50=5μm are used.

[0127] The preparation method is the same as that in Example 1.

[0128] Example 8

[0129] This embodiment provides a honeycomb ceramic unit body with high porosity, high thermal conductivity and low shrinkage. The honeycomb ceramic unit body is in the shape of a rectangular parallelepiped. A plurality of honeycomb ceramic unit bodies are adjacently spliced ​​to form a honeycomb ceramic carrier with a roughly circular cross-section. The raw materials of the honeycomb ceramic unit body include, by weight: 76 parts of silicon carbide powder, 24 parts of silicon powder, 2 parts of alkaline earth metal oxide, 1.1 parts of clay, 25 parts of binder and 35 parts of pore-forming agent. In the honeycomb ceramic unit body, the alkaline earth metal oxide is 0.5 parts of strontium oxide and 0.5 parts of strontium oxide. 1 part of calcium and 0.5 part of magnesium oxide; in the honeycomb ceramic unit body, the clay is 0.8 parts of diatomaceous earth and 0.3 parts of kaolin; in the honeycomb ceramic unit body, the binder is 15 parts of hydroxymethyl cellulose, 2 parts of ethyl cellulose, 4 parts of glycerol and 4 parts of potassium laurate; in the honeycomb ceramic unit body, the pore-forming agent is 20 parts of ammonium chloride, 10 parts of benzoic acid and 5 parts of polymethyl methacrylate; in the honeycomb ceramic unit body, 70 parts of silicon carbide powder with D50=31μm and 6 parts of silicon carbide powder with D50=8μm are used.

[0130] The preparation method is the same as that in Example 1.

[0131] Example 9

[0132] This embodiment provides a honeycomb ceramic unit body with high porosity, high thermal conductivity and low shrinkage. The honeycomb ceramic unit body is in the shape of a rectangular parallelepiped. A plurality of honeycomb ceramic unit bodies are adjacently spliced ​​to form a honeycomb ceramic carrier with a roughly circular cross-section. The raw materials of the honeycomb ceramic unit body include, by weight: 75 parts of silicon carbide powder, 25 parts of silicon powder, 2 parts of alkaline earth metal oxide, 1.1 parts of clay, 18 parts of binder and 25 parts of pore-forming agent. In the honeycomb ceramic unit body, the alkaline earth metal oxide The honeycomb ceramic unit body comprises 0.5 parts of strontium oxide, 1 part of calcium oxide and 0.5 parts of magnesium oxide; the honeycomb ceramic unit body comprises 0.8 parts of montmorillonite and 0.3 parts of kaolin as clay; the honeycomb ceramic unit body comprises 15 parts of hydroxymethyl cellulose and 3 parts of ethyl cellulose as binder; the honeycomb ceramic unit body comprises 20 parts of graphite and 5 parts of walnut powder as pore-forming agent; the honeycomb ceramic unit body comprises 70 parts of silicon carbide powder with D50=33μm and 5 parts of silicon carbide powder with D50=7μm.

[0133] The preparation method is the same as that in Example 1.

[0134] Comparative Example 1

[0135] In this embodiment, particle grading is not used, and the silicon carbide powder used is all D50=25μm, and the weight proportions of the remaining raw materials are the same as those in Example 1; in addition, the raw materials of the honeycomb ceramic unit body include, by weight proportions: 80 parts of silicon carbide powder, 20 parts of silicon powder, 1.5 parts of alkaline earth metal oxides, 0.8 parts of clay, 20.5 parts of binders, and 30 parts of pore formers; in the honeycomb ceramic unit body, the alkaline earth metal oxides are 0.5 parts of calcium oxide and 1 part of beryllium oxide; in the honeycomb ceramic unit body, the clay is 0.8 parts of kaolin; in the honeycomb ceramic unit body, the binder is 10 parts of hydroxymethyl cellulose, 5 parts of polyvinyl alcohol, 3 parts of glycerol and 2.5 parts of potassium laurate; in the honeycomb ceramic unit body, the pore formers are 14 parts of starch and 16 parts of walnut powder.

[0136] The preparation method is the same as that in Example 1.

[0137] Comparative Example 2

[0138] The particle grading is used, but the two particle sizes of silicon carbide powder used are silicon carbide powder with a particle size of D50=19 μm and silicon carbide powder with a particle size of D50=15 μm, and the weight proportions of the other raw materials are the same as those in Example 1; the raw materials of the honeycomb ceramic unit body include, by weight proportions: 80 parts of silicon carbide powder, 20 parts of silicon powder, 1.5 parts of alkaline earth metal oxide, 0.8 parts of clay, 20.5 parts of binder, and 30 parts of pore former; in the honeycomb ceramic unit body, the alkaline earth metal oxide is selected from Use 0.5 parts of calcium oxide and 1 part of beryllium oxide; in the honeycomb ceramic unit body, the clay uses 0.8 parts of kaolin; in the honeycomb ceramic unit body, the binder uses 10 parts of hydroxymethyl cellulose, 5 parts of polyvinyl alcohol, 3 parts of glycerol and 2.5 parts of potassium laurate; in the honeycomb ceramic unit body, the pore-forming agent uses 14 parts of starch and 16 parts of walnut powder; in the honeycomb ceramic unit body, use 78 parts of silicon carbide powder with D50=19μm and 2 parts of silicon carbide powder with D50=15μm.

[0139] The preparation method is the same as that in Example 1.

[0140] Comparative Example 3

[0141] Particle grading is used, but the content of silicon powder used is not within the given range, and the weight proportions of the remaining raw materials are the same as those in Example 1; in addition, the honeycomb ceramic unit body includes, by weight proportions: 80 parts of silicon carbide powder, 10 parts of silicon powder, 1.5 parts of alkaline earth metal oxide, 0.8 parts of clay, 20.5 parts of binder, and 30 parts of pore-forming agent; in the honeycomb ceramic unit body, the alkaline earth metal oxide is 0.5 parts of calcium oxide and 1 part of beryllium oxide; in the honeycomb ceramic unit body, the clay is 0.8 parts of kaolin; in the honeycomb ceramic unit body, the binder is 10 parts of hydroxymethyl cellulose, 5 parts of polyvinyl alcohol, 3 parts of glycerol, and 2.5 parts of potassium laurate. In the honeycomb ceramic unit body, the pore-forming agent is 14 parts of starch and 16 parts of walnut powder; in the honeycomb ceramic unit body, 78 parts of silicon carbide powder with D50=20μm and 2 parts of silicon carbide powder with D50=7μm are used.

[0142] The preparation method is the same as that in Example 1.

[0143] The honeycomb ceramic carriers obtained from the above embodiments and comparative examples were subjected to performance tests:

[0144] 1. The porosity test method is mercury intrusion method, which is measured by making a sample block with a length, width and height of 10mm*10mm*15mm using a mercury intrusion instrument (MicroActive AutoPore V9600 Version 2.03.00) from Micromeritics. The test method is the national standard: GB / T21650.1-2008;

[0145] 2. The shrinkage rate test method is to use a vernier caliper to measure the length, width and height of the honeycomb ceramic unit before and after firing, and then calculate and obtain the shrinkage rate data;

[0146] 3. The thermal diffusion coefficient is measured by cutting a sample with a side length of 10mm*10mm and a thickness of 1mm on the surface of the unit body, using a laser thermal conductivity meter (LFA467) from NETZSCH in Germany, at a heating interval of 50K / min. The test method is the national standard: GB / T22588-2008;

[0147] 4. The compressive strength is measured by making the sample block into a sample block with a length, width and height of 25mm*25mm*25mm using Suzhou Tuobo's universal material testing machine. The test method is the national standard: GB / T4740-1999; A-axis compression refers to the compressive strength of the honeycomb ceramic carrier along its longitudinal direction.

[0148] The above performance parameters are listed in Table 1 below.

[0149] Table 1 Performance parameters of honeycomb ceramic carriers obtained in various embodiments and comparative examples

[0150]

[0151] As can be seen from Table 1, with the increase of the pore-forming agent content, the porosity tends to increase, and with the increase of the Si content, the thermal diffusion coefficient and mechanical strength gradually increase, but the shrinkage rate also increases. Compared with Example 1, in the case of no particle grading, the shrinkage rate of Comparative Example 1 is significantly improved, and the increase in shrinkage rate will also lead to a decrease in porosity. Compared with Example 1, when the SiC particle size used is not in the given range, the shrinkage rate of the product of Comparative Example 2 will also increase significantly. Compared with Example 1, when the Si content used is low, although the shrinkage will decrease, the thermal diffusion coefficient and mechanical strength will be greatly reduced. Therefore, the use of particle grading can greatly reduce shrinkage while ensuring a high porosity (≥57%). At the same time, when the mass fraction of silicon powder is controlled at 15-25 parts, it can ensure that the thermal diffusion coefficient is greater than 6mm. 2 / s, A-axis compressive strength>3MPa and can ensure the overall shrinkage rate of the product is <3%.

[0152] The above is only a specific implementation of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed by the present invention, which should be covered within the protection scope of the present invention. Therefore, the protection scope of the present invention shall be based on the protection scope of the claims. In addition, the specification uses specific examples to illustrate the principles and implementation methods of the present invention. The description of the above embodiments is only used to help understand the method of the present invention and its core idea. The content of this specification should not be understood as a limitation on the present invention.

Claims

1. A honeycomb ceramic unit body, characterized in that: The porosity of the honeycomb ceramic unit body is 55-65%, and the thermal diffusion coefficient is greater than or equal to 6 mm 2 / s, and the shrinkage rate in each direction is less than or equal to 4%.

2. The honeycomb ceramic unit body according to claim 1, characterized in that: The porosity of the honeycomb ceramic unit body is 57-63%, and the thermal diffusion coefficient is greater than or equal to 7 mm 2 / s, and the shrinkage rate in each direction is less than 3.5%.

3. The honeycomb ceramic unit body according to claim 1, characterized in that: The shrinkage rate of the honeycomb ceramic unit body in the height direction is 0.5-4%, the shrinkage rate in the length direction is 1-4%, the shrinkage rate in the width direction is 1-4%, and the compressive strength of the longitudinal axis is 2-8 MPa; Preferably, the shrinkage rate of the honeycomb ceramic unit body in the height direction is 0.5-2%, the shrinkage rate in the length direction is 1-3.5%, the shrinkage rate in the width direction is 1-3%, and the compressive strength of the longitudinal axis is 3-7.5 MPa.

4. The honeycomb ceramic unit body according to claim 1, characterized in that: The raw materials of the honeycomb ceramic unit body include silicon carbide powder, silicon powder, alkaline earth metal oxide, clay, binder, pore former and lubricant.

5. The honeycomb ceramic unit body according to claim 4, characterized in that: The raw materials of the honeycomb ceramic unit body include 75-85 parts by weight of silicon carbide powder, 15-25 parts by weight of silicon powder, 0.2-2 parts by weight of alkaline earth metal oxide, 0.5-1.5 parts by weight of clay, 15-25 parts by weight of binder, 25-35 parts by weight of pore former, 20-70 parts by weight of water and 2-15 parts by weight of lubricant; Preferably, the raw materials of the honeycomb ceramic unit body include 75 to 85 parts by weight of silicon carbide powder, 15 to 25 parts by weight of silicon powder, 1.2 to 2 parts by weight of alkaline earth metal oxides, 0.5 to 1.5 parts by weight of clay, 15 to 25 parts by weight of a binder, 25 to 35 parts by weight of a pore former, 30 to 60 parts by weight of water and 3 to 10 parts by weight of a lubricant.

6. The honeycomb ceramic unit body according to claim 4 or 5, characterized in that: The silicon carbide powder includes a primary silicon carbide powder with a D50 of 15 to 50 μm and a secondary silicon carbide powder with a D50 of 1 to 12 μm; Preferably, the D50 of the primary silicon carbide powder is 20 to 45 μm, and the D50 of the secondary silicon carbide powder is 2 to 10 μm.

7. The honeycomb ceramic unit body according to claim 6, characterized in that: The mass ratio of the primary silicon carbide powder to the secondary silicon carbide powder is (65-80):(2-15); Preferably, the mass ratio of the primary silicon carbide powder to the secondary silicon carbide powder is (65-80):(5-15).

8. The honeycomb ceramic unit body according to claim 4 or 5, characterized in that: The alkaline earth metal oxide is selected from at least one of magnesium oxide, beryllium oxide, strontium oxide, calcium oxide and barium oxide.

9. The honeycomb ceramic unit body according to claim 4 or 5, characterized in that: The binder is selected from at least one of polyvinyl alcohol, glycerol, ethyl cellulose, polyethylene glycol, methyl cellulose, potassium laurate and carboxymethyl cellulose.

10. The honeycomb ceramic unit body according to claim 4 or 5, characterized in that: The clay is selected from at least one of kaolin, bentonite, montmorillonite, diatomaceous earth, perlite, illite and lithophyllite.

11. The honeycomb ceramic unit body according to claim 4 or 5, characterized in that: The mass fraction of oxides in the raw materials of the honeycomb ceramic unit body is lower than 3%, preferably lower than 2.6%, wherein the mass fraction of oxides is the sum of the mass fractions of alkaline earth metal oxides and oxides in clay.

12. The honeycomb ceramic unit body according to claim 4 or 5, characterized in that: The pore-forming agent is selected from at least one of walnut powder, graphite, benzoic acid, starch, ammonium bicarbonate, ammonium chloride, polymethyl methacrylate, and expanded microspheres; And / or, the lubricant is glycerol.

13. The honeycomb ceramic unit body according to claim 12, characterized in that: The particle size D50 of the pore former is 5 to 40 μm, preferably 10 to 30 μm.

14. A method for preparing a honeycomb ceramic unit body according to any one of claims 1 to 13, characterized in that: The method comprises the following steps: S11, dry-mixing silicon carbide powder, pure silicon powder, alkaline earth metal oxide, clay, a binder, and a pore-forming agent; S12, adding water and lubricant to the mixture obtained in step S11, and wet mixing; S13, kneading the mixture obtained in step S12; S14, extruding the mixture obtained in step S13; S15. The mixture obtained in step S14 is microwave dried and sintered to obtain the honeycomb ceramic unit body.

15. The method according to claim 14, characterized in that The method has one or more of the following features: In the step S11, a high-speed mixer is used for dry mixing, the dry mixing speed is 60 to 90 rpm, and the dry mixing time is 10 to 30 minutes. Preferably, the dry mixing speed is 80 rpm, and the dry mixing time is 15 minutes; In step S12, the wet mixing speed is 60-90 rpm, and the wet mixing time is 2-30 min. Preferably, the wet mixing speed is 80 rpm, and the wet mixing time is 5 min. In the step S13, a biaxial kneading machine is used for kneading, and the kneading time is 10 to 20 minutes, preferably, the kneading time is 10 to 20 minutes, preferably 15 minutes; In the step S14, an extruder is used for extrusion molding, and the extrusion pressure is 5 to 12 MPa, preferably, the extrusion pressure is 6 to 10 MPa; In step S15, the microwave drying time is 20 to 40 minutes, preferably 30 minutes.

16. A honeycomb ceramic carrier, characterized in that: The honeycomb ceramic support is composed of a plurality of honeycomb ceramic unit bodies according to any one of claims 1 to 13, or a honeycomb ceramic unit body obtained by the method according to claim 14 or 15.

17. A method for preparing the honeycomb ceramic carrier according to claim 16, characterized in that: The method comprises the following steps: S1, preparing a honeycomb ceramic unit body as claimed in any one of claims 1 to 13; S2, splicing the honeycomb ceramic unit bodies to obtain a rough blank; S3, adding a splicing material to the splicing seam of the rough blank obtained in step S2 to obtain a blank; S4, grinding the periphery and end surface of the blank obtained in step S3 to obtain a blank; S5, skinning the green body obtained in step S4, and drying it to obtain the honeycomb ceramic carrier.

18. An exhaust gas catalytic core, characterized in that: The exhaust gas catalytic core comprises: The honeycomb ceramic unit body according to any one of claims 1 to 13, or the honeycomb ceramic unit body obtained by the method according to claim 14 or 15, or the honeycomb ceramic carrier according to claim 16, or the honeycomb ceramic carrier obtained by the method according to claim 17; and A catalyst is coated on the partition walls of the internal cells of the honeycomb ceramic unit body.

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