CN117865714A - Ceramic powder, ceramic slurry and preparation method of porous ceramic - Google Patents
Ceramic powder, ceramic slurry and preparation method of porous ceramic Download PDFInfo
- Publication number
- CN117865714A CN117865714A CN202410077034.4A CN202410077034A CN117865714A CN 117865714 A CN117865714 A CN 117865714A CN 202410077034 A CN202410077034 A CN 202410077034A CN 117865714 A CN117865714 A CN 117865714A
- Authority
- CN
- China
- Prior art keywords
- ceramic
- powder
- porous
- slurry
- porous ceramic
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 239000000919 ceramic Substances 0.000 title claims abstract description 221
- 239000000843 powder Substances 0.000 title claims abstract description 85
- 239000002002 slurry Substances 0.000 title claims abstract description 68
- 238000002360 preparation method Methods 0.000 title abstract description 9
- 238000007613 slurry method Methods 0.000 title description 2
- CPLXHLVBOLITMK-UHFFFAOYSA-N Magnesium oxide Chemical compound [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 claims abstract description 28
- 238000005245 sintering Methods 0.000 claims abstract description 28
- 239000006004 Quartz sand Substances 0.000 claims abstract description 19
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims abstract description 19
- 239000011521 glass Substances 0.000 claims abstract description 19
- 239000000395 magnesium oxide Substances 0.000 claims abstract description 18
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 17
- 238000010438 heat treatment Methods 0.000 claims description 24
- 229920002554 vinyl polymer Polymers 0.000 claims description 19
- 239000011230 binding agent Substances 0.000 claims description 17
- 239000011148 porous material Substances 0.000 claims description 14
- 238000002156 mixing Methods 0.000 claims description 13
- 239000002904 solvent Substances 0.000 claims description 13
- 238000005238 degreasing Methods 0.000 claims description 12
- 238000003825 pressing Methods 0.000 claims description 12
- 239000008367 deionised water Substances 0.000 claims description 9
- 229910021641 deionized water Inorganic materials 0.000 claims description 9
- 238000000462 isostatic pressing Methods 0.000 claims description 9
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical group O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 9
- QGZKDVFQNNGYKY-UHFFFAOYSA-O Ammonium Chemical compound [NH4+] QGZKDVFQNNGYKY-UHFFFAOYSA-O 0.000 claims description 8
- 239000002202 Polyethylene glycol Substances 0.000 claims description 8
- DPXJVFZANSGRMM-UHFFFAOYSA-N acetic acid;2,3,4,5,6-pentahydroxyhexanal;sodium Chemical compound [Na].CC(O)=O.OCC(O)C(O)C(O)C(O)C=O DPXJVFZANSGRMM-UHFFFAOYSA-N 0.000 claims description 8
- 239000001768 carboxy methyl cellulose Substances 0.000 claims description 8
- 238000005469 granulation Methods 0.000 claims description 8
- 230000003179 granulation Effects 0.000 claims description 8
- AXZKOIWUVFPNLO-UHFFFAOYSA-N magnesium;oxygen(2-) Chemical compound [O-2].[Mg+2] AXZKOIWUVFPNLO-UHFFFAOYSA-N 0.000 claims description 8
- 229920000058 polyacrylate Polymers 0.000 claims description 8
- 229920001223 polyethylene glycol Polymers 0.000 claims description 8
- 235000019812 sodium carboxymethyl cellulose Nutrition 0.000 claims description 8
- 229920001027 sodium carboxymethylcellulose Polymers 0.000 claims description 8
- 239000000853 adhesive Substances 0.000 claims description 7
- 230000001070 adhesive effect Effects 0.000 claims description 7
- 239000007787 solid Substances 0.000 claims description 7
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 claims description 6
- 238000000227 grinding Methods 0.000 claims description 6
- 239000002023 wood Substances 0.000 claims description 6
- 239000005995 Aluminium silicate Substances 0.000 claims description 5
- 239000002253 acid Substances 0.000 claims description 5
- 235000012211 aluminium silicate Nutrition 0.000 claims description 5
- 238000001816 cooling Methods 0.000 claims description 5
- NLYAJNPCOHFWQQ-UHFFFAOYSA-N kaolin Chemical compound O.O.O=[Al]O[Si](=O)O[Si](=O)O[Al]=O NLYAJNPCOHFWQQ-UHFFFAOYSA-N 0.000 claims description 5
- 238000000034 method Methods 0.000 claims description 5
- 238000007873 sieving Methods 0.000 claims description 5
- 238000009461 vacuum packaging Methods 0.000 claims description 5
- 239000004698 Polyethylene Substances 0.000 claims description 3
- 239000004793 Polystyrene Substances 0.000 claims description 3
- 239000004372 Polyvinyl alcohol Substances 0.000 claims description 3
- 229920002472 Starch Polymers 0.000 claims description 3
- 229910000019 calcium carbonate Inorganic materials 0.000 claims description 3
- 229920001577 copolymer Polymers 0.000 claims description 3
- 239000000428 dust Substances 0.000 claims description 3
- 229920003229 poly(methyl methacrylate) Polymers 0.000 claims description 3
- -1 polyethylene Polymers 0.000 claims description 3
- 229920000573 polyethylene Polymers 0.000 claims description 3
- 239000004926 polymethyl methacrylate Substances 0.000 claims description 3
- 229920002223 polystyrene Polymers 0.000 claims description 3
- 229920002689 polyvinyl acetate Polymers 0.000 claims description 3
- 239000011118 polyvinyl acetate Substances 0.000 claims description 3
- 229920002451 polyvinyl alcohol Polymers 0.000 claims description 3
- 238000005507 spraying Methods 0.000 claims description 3
- 239000008107 starch Substances 0.000 claims description 3
- 235000019698 starch Nutrition 0.000 claims description 3
- 239000011032 tourmaline Substances 0.000 claims description 3
- 229940070527 tourmaline Drugs 0.000 claims description 3
- 229910052613 tourmaline Inorganic materials 0.000 claims description 3
- 238000004519 manufacturing process Methods 0.000 claims 3
- 239000007921 spray Substances 0.000 description 12
- 239000002245 particle Substances 0.000 description 7
- 238000011056 performance test Methods 0.000 description 7
- 230000000694 effects Effects 0.000 description 5
- 238000012360 testing method Methods 0.000 description 4
- 238000000889 atomisation Methods 0.000 description 3
- 241000208125 Nicotiana Species 0.000 description 2
- 235000002637 Nicotiana tabacum Nutrition 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 2
- 229910010293 ceramic material Inorganic materials 0.000 description 2
- 238000002485 combustion reaction Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 239000000779 smoke Substances 0.000 description 2
- 238000001179 sorption measurement Methods 0.000 description 2
- 239000012798 spherical particle Substances 0.000 description 2
- 238000005303 weighing Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000011031 large-scale manufacturing process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 231100000956 nontoxicity Toxicity 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B38/00—Porous mortars, concrete, artificial stone or ceramic ware; Preparation thereof
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Manufacturing & Machinery (AREA)
- Compositions Of Oxide Ceramics (AREA)
Abstract
The application belongs to the technical field of ceramic core preparation, and relates to ceramic powder, which comprises the following components in percentage by mass: 30-60% of ceramic aggregate, 5-20% of sintering aid, 1-10% of glass powder and 10-50% of pore-forming agent; wherein, the ceramic aggregate consists of 20 to 50 percent of quartz sand and 10 to 30 percent of magnesia. The application also relates to a ceramic slurry and a preparation method of the porous ceramic. The technical scheme provided by the application can improve the uniformity of ceramic powder, reduce the specific surface area of ceramic, and ensure that the ceramic slurry has good fluidity, thereby improving the porosity and the structural strength of porous ceramic.
Description
Technical Field
The application relates to the technical field of ceramic core preparation, in particular to ceramic powder, ceramic slurry and a preparation method of porous ceramic.
Background
The ceramic core is used as a heating element of the electronic atomization device, is one of important component parts, and has the principle that: the smoke oil stored in the atomizer volatilizes through the heating of battery power supply, and a certain amount of smoke is generated. Along with the development of technology, the carrier for adsorbing tobacco tar in the ceramic core is mainly inorganic nonmetallic ceramic material, which not only has strong adsorption capacity, but also has the advantages of no toxicity, no harm, safety, reliability, no combustibility, stability and the like, so that the porous ceramic material is one of good materials suitable for preparing the ceramic core.
In order to improve the atomization effect of the electronic atomization device, the structural strength, the porosity and the pore size of the porous ceramic are all affected.
The existing ceramic powder for preparing the porous ceramic mainly takes quartz sand as a main body, and a binder and a pore-forming agent are added, so that the surface area of the powder produced in the industry is overlarge, and the structural strength of the sintered porous ceramic is low; in addition, the powder is not uniformly mixed, so that the fluidity of the formed ceramic slurry is poor, and the structural consistency of the porous ceramic formed by sintering is poor.
Disclosure of Invention
The technical problem to be solved by the embodiment of the application is that the surface area of the powder produced by the prior art is overlarge, the powder is not uniformly mixed, the structural strength of the sintered porous ceramic is low, and the porosity and the pore size are inconsistent.
In order to solve the above technical problems, the embodiments of the present application provide a ceramic powder, which adopts the following technical scheme:
the ceramic powder comprises the following components in percentage by mass: 30-60% of ceramic aggregate, 5-20% of sintering aid, 1-10% of glass powder and 10-50% of pore-forming agent; wherein the ceramic aggregate consists of 20% -50% of quartz sand and 10% -30% of magnesia.
Further, the sintering aid is at least one selected from calcium carbonate, kaolin and tourmaline; and/or
The glass powder is selected from high-temperature lead-free glass powder; and/or
The pore-forming agent is at least one selected from polymethyl methacrylate, wood dust, starch, polyvinyl alcohol and polystyrene.
In order to solve the above technical problems, the embodiments of the present application further provide a ceramic slurry, which adopts the following technical scheme:
a ceramic slurry comprising a solute selected from the ceramic powders of claim 1 or 2 and a solvent selected from deionized water.
Further, the solute accounts for 30% -60% of the total mass of the ceramic slurry, and the solvent accounts for 40% -70% of the total mass of the ceramic slurry.
Further, the ceramic slurry further comprises a binder, wherein the total amount of the ceramic slurry is 100%, and the mass percentage of the binder is 4% -20%;
wherein the solid content of the ceramic slurry is 50% -60%.
Further, the binder comprises at least two of ammonium polyvinyl acid, polyethylene glycol, polyvinyl alcohol-polyacrylate copolymer, polyethylene, polyvinyl alcohol-polyvinyl amide copolymer and sodium carboxymethyl cellulose;
preferably, the binder consists of 1% -5% of ammonium polyvinyl acid, 1% -5% of polyethylene glycol, 1% -5% of polyvinyl alcohol-polyacrylate copolymer and 1% -5% of sodium carboxymethyl cellulose.
In order to solve the above technical problems, the embodiments of the present application further provide a method for preparing porous ceramics, which adopts the following technical scheme:
a method for preparing porous ceramics, comprising the following steps:
uniformly mixing ceramic aggregate, a sintering aid, glass powder and a pore-forming agent to obtain ceramic powder, wherein the ceramic aggregate comprises quartz sand and magnesium oxide;
mixing the ceramic powder with deionized water according to a set proportion to obtain first ceramic slurry;
grinding the first ceramic slurry, and adding an adhesive to obtain a second ceramic slurry, wherein the solid content of the second ceramic slurry is 50% -60%;
spraying granulation and sieving treatment are carried out on the second ceramic slurry to obtain porous ceramic powder;
pressurizing the porous ceramic powder to obtain a porous ceramic green body;
and degreasing and sintering the porous ceramic green body, and cooling to room temperature to obtain the porous ceramic.
Further, the step of pressurizing the porous ceramic powder includes the steps of:
carrying out dry pressing treatment on the porous ceramic powder, wherein the pressure of the dry pressing treatment is 30-120 MPa;
and carrying out vacuum packaging on the porous ceramic powder subjected to the dry pressing treatment, and then carrying out isostatic pressing treatment, wherein the pressure of the isostatic pressing treatment is 60-240 MPa.
Further, the step of degreasing and sintering the porous ceramic green body comprises the following steps:
placing the ceramic blank into a sintering furnace, heating to 150 ℃ at 0.5 ℃/min, and preserving heat for 1h; heating to 250 ℃ at 0.1 ℃/min, heating to 450 ℃ at 0.2 ℃/min, and preserving heat for 2 hours; heating to 900 ℃ at a speed of 2.5 ℃/min, and preserving heat for 1h; then the temperature is raised to 1150 ℃ at 2.5 ℃/min, and the temperature is kept for 2 hours.
Further, the set proportion is 3:7-4:6; and/or
The porosity of the porous ceramic is 50% -70%; and/or
The pore diameter of the porous ceramic is 15-30 mu m.
Compared with the prior art, the embodiment of the application has the following main beneficial effects:
the ceramic aggregate of the ceramic powder provided by the application consists of quartz sand and magnesia, and the magnesia is introduced to overlap with quartz sand particles, so that a firm framework structure is formed, and the strength of the ceramic aggregate is improved; meanwhile, the sintering temperature of the ceramic powder is reduced by adding the combustion improver and the glass powder according to the set mass ratio; by further adding pore-forming agents, the porous ceramic is convenient to form good porosity and uniform pore size on the sintered porous ceramic; in addition, as the particle size of the magnesium oxide is smaller than that of the quartz sand, the magnesium oxide can be filled between the quartz sand when the ceramic powder is mixed, so that the effects of improving the mixing uniformity of the powder and reducing the specific surface area are achieved.
The porous ceramic formed by sintering the ceramic powder provided by the application forms micropores of 15-30 mu m, the porosity is 50-70%, and the compressive strength is 12-15 MPa.
Drawings
For a clearer description of the solution of the present application, a brief introduction will be given to the drawings needed in the description of the embodiments, which are some embodiments of the present application, and from which other drawings can be obtained for a person skilled in the art without the inventive effort.
Fig. 1 is a workflow diagram of a method of preparing a porous ceramic according to an embodiment of the present application.
Detailed Description
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs; the terminology used in the description of the applications herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application; the terms "comprising" and "having" and any variations thereof in the description and claims of the present application and in the description of the figures above are intended to cover non-exclusive inclusions. The terms first, second and the like in the description and in the claims or in the above-described figures, are used for distinguishing between different objects and not necessarily for describing a sequential or chronological order.
Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment may be included in at least one embodiment of the present application. The appearances of such phrases in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. Those of skill in the art will explicitly and implicitly appreciate that the embodiments described herein may be combined with other embodiments.
Embodiments of the present application provide a ceramic powder, in some embodiments, comprising the following components in mass percent: 30-60% of ceramic aggregate, 5-20% of sintering aid, 1-10% of glass powder and 10-50% of pore-forming agent.
In the embodiment, the ceramic aggregate consists of 20% -50% of quartz sand and 10% -30% of magnesia.
The ceramic aggregate of the ceramic powder provided by the embodiment of the application consists of quartz sand and magnesia, and the magnesia is introduced to overlap with quartz sand particles, so that a firm framework structure is formed, and the strength of the ceramic aggregate is improved; meanwhile, the sintering temperature of the ceramic powder is reduced by adding the combustion improver and the glass powder according to the set mass ratio; by further adding pore-forming agents, the porous ceramic is convenient to form good porosity and uniform pore size on the sintered porous ceramic; in addition, as the particle size of the magnesium oxide is smaller than that of the quartz sand, the magnesium oxide can be filled between the quartz sand when the ceramic powder is mixed, so that the effects of improving the mixing uniformity of the powder and reducing the specific surface area are achieved.
In some embodiments, the burn aid is selected from at least one of calcium carbonate, kaolin, tourmaline.
In some embodiments, the glass frit is selected from high temperature lead-free glass frits.
In some embodiments, the pore-forming agent is selected from at least one of polymethyl methacrylate, wood chips, starch, polyvinyl alcohol, polystyrene.
Based on the ceramic powder, the embodiment of the application also provides ceramic slurry which comprises solute and solvent.
In some embodiments, the solute is selected from ceramic powders as described above and the solvent is selected from deionized water.
According to the embodiment of the application, the ceramic powder is adopted as the ceramic slurry formed after the solute and the deionized water are mixed, and the ceramic slurry formed by the ceramic powder has good fluidity due to good uniformity of the ceramic powder, so that the structural consistency of the porous ceramic formed by the ceramic slurry is good, and the structural strength distribution of each part is uniform.
In some embodiments, the solute comprises 30% -60% of the total mass of the ceramic slurry, the solvent comprises 40% -70% of the total mass of the ceramic slurry, and in particular, the solute comprises 30% of the total mass of the ceramic slurry, and the solvent comprises 70% of the total mass of the ceramic slurry; it may also be arranged that the solute accounts for 35% of the total mass of the ceramic slurry, and the solvent accounts for 65% of the total mass of the ceramic slurry; it may also be arranged that the solute comprises 30% of the total mass of the ceramic slurry and the solvent comprises 60% of the total mass of the ceramic slurry.
In some embodiments, the ceramic slurry further comprises a binder, and the binder is added to knead or banburying the ceramic slurry, so that the bonding strength of the ceramic slurry is improved, and the solid content of the ceramic slurry and the overall strength of the ceramic slurry are improved; meanwhile, the binder fills the pores among the materials, so that the contact area is increased, and the effect of improving the connection firmness of the ceramic slurry is achieved.
In some embodiments, the mass percentage of the binder is 4% to 20%, specifically, the mass percentage of the binder may be set to any one value or a range formed between any two values of 4%, 5%, 10%, 15%, 20%, based on the total amount of the ceramic slurry as 100%.
In some embodiments, the ceramic slurry has a solids content of 50% to 60% after the binder is added.
In some embodiments, the binder comprises at least two of ammonium polyvinyl acetate, polyethylene glycol, polyvinyl alcohol-polyacrylate copolymer, polyethylene, polyvinyl alcohol-polyvinyl amide copolymer, sodium carboxymethyl cellulose.
In the embodiment, the binder consists of 1% -5% of ammonium polyvinyl acetate, 1% -5% of polyethylene glycol, 1% -5% of polyvinyl alcohol-polyacrylate copolymer and 1% -5% of sodium carboxymethyl cellulose.
Referring to fig. 1, based on the ceramic powder and the ceramic slurry, the embodiment of the application further provides a preparation method of the porous ceramic, which comprises the following steps:
step S100, uniformly mixing ceramic aggregate, sintering aid, glass powder and pore-forming agent to obtain ceramic powder;
in some embodiments, the ceramic aggregate comprises quartz sand and magnesia, in this embodiment, the ceramic aggregate is composed of 20% -50% of quartz sand and 10% -30% of magnesia, and the ceramic powder prepared in the step S100 comprises the following components in percentage by mass: 30-60% of ceramic aggregate, 5-20% of sintering aid, 1-10% of glass powder and 10-50% of pore-forming agent.
Step S200, mixing the ceramic powder with deionized water according to a set proportion to obtain first ceramic slurry;
in some embodiments, the setting ratio is 3:7 to 4:6, specifically, the setting ratio may be set to 3:7, 3.5:6.5, and 4:7, and in this embodiment, the setting ratio is preferably 4:6.
Step S300, after grinding the first ceramic slurry, adding an adhesive to obtain a second ceramic slurry;
in some embodiments, the second ceramic slurry has a solids content of 50% to 60%.
Step S400, spraying granulation and sieving treatment are carried out on the second ceramic slurry to obtain porous ceramic powder;
step S500, performing pressure treatment on the porous ceramic powder to obtain a porous ceramic green body;
and S600, degreasing and sintering the porous ceramic green body, and cooling to room temperature to obtain the porous ceramic.
According to the preparation method of the porous ceramic, the ceramic aggregate, the sintering aid, the glass powder and the pore-forming agent are mixed according to the set mass ratio to form the ceramic powder, so that the mixing uniformity is good, the specific surface area is small, meanwhile, the ceramic powder is sintered to form ceramic slurry, the fluidity is good, the porosity of the porous ceramic formed after degreasing and sintering is high, the adsorption capacity to tobacco tar is strong, the product consistency is good, the strength of a ceramic blank is high, and the high-efficiency large-scale production is facilitated.
The porous ceramic prepared by the preparation method of the porous ceramic provided by the application forms micropores of 15-30 mu m, the porosity is 50-70%, and the compressive strength is 12-15 MPa.
In some embodiments, in the step S300, the duration of the grinding process is 1h to 2h.
In some embodiments, the step S400, performing spray granulation on the second ceramic slurry, includes the steps of:
the second ceramic slurry was placed in a centrifugal spray granulator (in this example, a 12-primary centrifugal spray granulator, dachuan) for granulation to form uniform spherical particles.
Wherein the air inlet temperature of the spray granulator is 200-270 ℃, the air outlet temperature is 80-100 ℃, the rotating speed of a centrifugal atomizer of the spray granulator is 14000-21000 r/min, and the frequency is 26Hz.
In some embodiments, in the step S400, the uniform spherical particles formed after spray granulation have a particle diameter of 15 μm to 30 μm, a loose packed volume of 25g/cm, a flow rate of 1.2S to 1.4S, and a specific surface area of 4m 2 /g～8m 2 /g。
In some embodiments, the step S500, the step of pressurizing the porous ceramic powder, includes the steps of:
dry-pressing the porous ceramic powder;
in some embodiments, the pressure of the dry-press treatment is 30MPa to 120MPa, and in particular, the pressure of the dry-press treatment may be set to any one value or a range formed between any two values of 30MPa, 50MPa, 100MPa, 120 MPa.
And carrying out vacuum packaging on the porous ceramic powder subjected to the dry pressing treatment, and then carrying out isostatic pressing treatment.
In some embodiments, the pressure of the isostatic pressing treatment is 60MPa to 240MPa, specifically, the pressure of the isostatic pressing treatment may be set to any one value or a range formed between any two values of 60MPa, 100MPa, 150MPa, 200MPa, 240MPa.
In some embodiments, the step S600, the step of degreasing and sintering the porous ceramic green body, includes the following steps:
placing the ceramic blank into a sintering furnace, heating to 150 ℃ at 0.5 ℃/min, and preserving heat for 1h; heating to 250 ℃ at 0.1 ℃/min, heating to 450 ℃ at 0.2 ℃/min, and preserving heat for 2 hours; heating to 900 ℃ at a speed of 2.5 ℃/min, and preserving heat for 1h; then the temperature is raised to 1150 ℃ at 2.5 ℃/min, and the temperature is kept for 2 hours.
According to the embodiment of the application, the pore-forming agent and the solvent are decomposed sequentially under different temperature gradients in the degreasing stage, the pore-forming agent and the solvent are decomposed, then the ceramic is internally provided with holes with corresponding pore diameters, the high-strength porous ceramic with uniformly distributed large pore diameters is formed after high-temperature sintering, the porosity of the porous ceramic is 50% -70%, and the pore diameter is 15 mu m-30 mu m.
The present application is specifically illustrated by the following examples, which are only some of the examples of the present application and are not limiting of the present application.
In the case of example 1,
respectively weighing 28% of quartz sand, 25% of magnesium oxide, 6% of kaolin, 6% of glass powder and 35% of 100um of wood dust according to mass percentage, and uniformly mixing to obtain ceramic powder;
mixing the ceramic powder with deionized water according to a ratio of 4:6 to obtain first ceramic slurry;
thirdly, grinding the first ceramic slurry for 1h, and adding an adhesive to obtain a second ceramic slurry;
wherein the adhesive comprises 1% of ammonium polyvinyl acid, 2% of polyethylene glycol, 2% of polyvinyl alcohol-polyacrylate copolymer and 1% of sodium carboxymethyl cellulose.
Step four, placing the second ceramic slurry into a Dachuan original 12-type centrifugal spray granulator for granulation and sieving to obtain porous ceramic powder;
wherein the feeding rate of the spray granulator is 80g/min, the air inlet temperature is 230 ℃, the air outlet temperature is 90 ℃, the rotating speed of a centrifugal atomizer of the spray granulator is 14400r/min, and the frequency is 26Hz.
Fifthly, placing the porous ceramic powder into a die to carry out dry pressing treatment under 40MPa, carrying out vacuum packaging on the porous ceramic powder subjected to the dry pressing treatment, and carrying out isostatic pressing treatment under 60 MPa;
step six, placing ceramic blanks in a degreasing disc in order, placing the degreasing disc in a sintering furnace without contact between the ceramic blanks, heating to 150 ℃ at 0.5 ℃/min, and preserving heat for 1h; heating to 250 ℃ at 0.1 ℃/min, heating to 450 ℃ at 0.2 ℃/min, and preserving heat for 2 hours; heating to 900 ℃ at a speed of 2.5 ℃/min, and preserving heat for 1h; then heating to 1150 ℃ at 2.5 ℃/min, preserving heat for 2 hours, and cooling to room temperature along with a furnace to obtain the porous ceramic.
Example 2
Respectively weighing 30% of quartz sand, 20% of magnesium oxide, 6% of kaolin, 6% of glass powder, 23% of 100-um wood chips and 15% of 50-um wood chips according to mass percentage, and uniformly mixing to obtain ceramic powder;
mixing the ceramic powder with deionized water according to a ratio of 4:6 to obtain first ceramic slurry;
thirdly, grinding the first ceramic slurry for 1h, and adding an adhesive to obtain a second ceramic slurry;
wherein the adhesive comprises 1.5% of ammonium polyvinyl acid, 2% of polyethylene glycol, 1.5% of polyvinyl alcohol-polyacrylate copolymer and 1% of sodium carboxymethyl cellulose.
Step four, placing the second ceramic slurry into a Dachuan original 12-type centrifugal spray granulator for granulation and sieving to obtain porous ceramic powder;
wherein the feeding rate of the spray granulator is 80g/min, the air inlet temperature is 230 ℃, the air outlet temperature is 90 ℃, the rotating speed of a centrifugal atomizer of the spray granulator is 14400r/min, and the frequency is 26Hz.
Fifthly, placing the porous ceramic powder into a die to carry out dry pressing treatment under 35MPa, carrying out vacuum packaging on the porous ceramic powder subjected to the dry pressing treatment, and carrying out isostatic pressing treatment under 65 MPa;
step six, placing ceramic blanks in a degreasing disc in order, placing the degreasing disc in a sintering furnace without contact between the ceramic blanks, heating to 150 ℃ at 0.5 ℃/min, and preserving heat for 1h; heating to 250 ℃ at 0.1 ℃/min, heating to 450 ℃ at 0.2 ℃/min, and preserving heat for 2 hours; heating to 900 ℃ at a speed of 2.5 ℃/min, and preserving heat for 1h; then heating to 1150 ℃ at 2.5 ℃/min, preserving heat for 2 hours, and cooling to room temperature along with a furnace to obtain the porous ceramic.
To demonstrate the technical effects of the present invention, the following performance tests were conducted on the porous ceramics of example 1 and example 2, respectively
Ceramic powder Performance test
The ceramic powders prepared in examples 1 and 2 were subjected to performance tests including flowability performance test, bulk density performance test, specific surface area test, moisture test and particle size test, and the test results are shown in table 1 below.
| Loose dress | Flow rate | Specific surface area | Moisture content | Particle size | |
| Example 1 | 24.2g/cm 3 | 1.33s | 6.2m 2 /g | 0.59％ | 27um |
| Example 2 | 24.5g/cm 3 | 1.35s | 6.5m 2 /g | 0.57％ | 27um |
TABLE 1
(II) porous ceramic Performance test
The porous ceramics prepared in examples 1 and 2 were subjected to performance test, the porosity of the ceramics was tested using a porosity tester, the pore size of the ceramics was tested using a pore size analyzer, the compressive strength of the ceramics was tested using an electronic universal tester, and the oil absorption time of the tested ceramics were measured, and the results are shown in table 2 below.
| Porosity of the porous material | Average pore diameter | Compressive Strength | Oil absorption time | |
| Example 1 | 57.3％ | 26.48um | 12Mpa | 20s |
| Example 2 | 55.6％ | 24.1um | 13.2Mpa | 25s |
TABLE 2
It is apparent that the embodiments described above are only some embodiments of the present application, but not all embodiments, the preferred embodiments of the present application are given in the drawings, but not limiting the patent scope of the present application. This application may be embodied in many different forms, but rather, embodiments are provided in order to provide a more thorough understanding of the present disclosure. Although the present application has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications may be made to the embodiments described in the foregoing, or equivalents may be substituted for elements thereof. All equivalent structures made by the specification and the drawings of the application are directly or indirectly applied to other related technical fields, and are also within the protection scope of the application.
Claims (10)
1. The ceramic powder is characterized by comprising the following components in percentage by mass: 30-60% of ceramic aggregate, 5-20% of sintering aid, 1-10% of glass powder and 10-50% of pore-forming agent; wherein the ceramic aggregate consists of 20% -50% of quartz sand and 10% -30% of magnesia.
2. The ceramic powder according to claim 1, wherein the sintering aid is at least one selected from the group consisting of calcium carbonate, kaolin, tourmaline; and/or
The glass powder is selected from high-temperature lead-free glass powder; and/or
The pore-forming agent is at least one selected from polymethyl methacrylate, wood dust, starch, polyvinyl alcohol and polystyrene.
3. A ceramic slurry comprising a solute and a solvent, wherein the solute is selected from the ceramic powders of claim 1 or 2, and the solvent is selected from deionized water.
4. A ceramic slurry according to claim 3, wherein the solute comprises 30% to 60% of the total mass of the ceramic slurry and the solvent comprises 40% to 70% of the total mass of the ceramic slurry.
5. The ceramic slurry according to claim 4, further comprising a binder, wherein the total amount of the ceramic slurry is 100%, and the binder is 4-20% by mass;
wherein the solid content of the ceramic slurry is 50% -60%.
6. The ceramic slurry of claim 5, wherein the binder comprises at least two of ammonium polyvinyl acetate, polyethylene glycol, polyvinyl alcohol-polyacrylate copolymer, polyethylene, polyvinyl alcohol-polyvinyl amide copolymer, sodium carboxymethyl cellulose;
preferably, the binder consists of 1% -5% of ammonium polyvinyl acid, 1% -5% of polyethylene glycol, 1% -5% of polyvinyl alcohol-polyacrylate copolymer and 1% -5% of sodium carboxymethyl cellulose.
7. A method for preparing porous ceramics, which is characterized by comprising the following steps:
uniformly mixing ceramic aggregate, a sintering aid, glass powder and a pore-forming agent to obtain ceramic powder, wherein the ceramic aggregate comprises quartz sand and magnesium oxide;
mixing the ceramic powder with deionized water according to a set proportion to obtain first ceramic slurry;
grinding the first ceramic slurry, and adding an adhesive to obtain a second ceramic slurry, wherein the solid content of the second ceramic slurry is 50% -60%;
spraying granulation and sieving treatment are carried out on the second ceramic slurry to obtain porous ceramic powder;
pressurizing the porous ceramic powder to obtain a porous ceramic green body;
and degreasing and sintering the porous ceramic green body, and cooling to room temperature to obtain the porous ceramic.
8. The method for producing a porous ceramic according to claim 7, wherein the step of subjecting the porous ceramic powder to pressure treatment comprises the steps of:
carrying out dry pressing treatment on the porous ceramic powder, wherein the pressure of the dry pressing treatment is 30-120 MPa;
and carrying out vacuum packaging on the porous ceramic powder subjected to the dry pressing treatment, and then carrying out isostatic pressing treatment, wherein the pressure of the isostatic pressing treatment is 60-240 MPa.
9. The method for producing a porous ceramic according to claim 7, wherein the step of degreasing and sintering the porous ceramic green body comprises the steps of:
placing the ceramic blank into a sintering furnace, heating to 150 ℃ at 0.5 ℃/min, and preserving heat for 1h; heating to 250 ℃ at 0.1 ℃/min, heating to 450 ℃ at 0.2 ℃/min, and preserving heat for 2 hours; heating to 900 ℃ at a speed of 2.5 ℃/min, and preserving heat for 1h; then the temperature is raised to 1150 ℃ at 2.5 ℃/min, and the temperature is kept for 2 hours.
10. The method for producing a porous ceramic according to claim 7, wherein the set ratio is 3:7 to 4:6; and/or
The porosity of the porous ceramic is 50% -70%; and/or
The pore diameter of the porous ceramic is 15-30 mu m.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202410077034.4A CN117865714A (en) | 2024-01-18 | 2024-01-18 | Ceramic powder, ceramic slurry and preparation method of porous ceramic |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202410077034.4A CN117865714A (en) | 2024-01-18 | 2024-01-18 | Ceramic powder, ceramic slurry and preparation method of porous ceramic |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN117865714A true CN117865714A (en) | 2024-04-12 |
Family
ID=90586434
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202410077034.4A Pending CN117865714A (en) | 2024-01-18 | 2024-01-18 | Ceramic powder, ceramic slurry and preparation method of porous ceramic |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN117865714A (en) |
-
2024
- 2024-01-18 CN CN202410077034.4A patent/CN117865714A/en active Pending
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN112047753B (en) | Porous ceramic and preparation method and application thereof | |
| CN107200599B (en) | Porous alumina ceramic and preparation method and application thereof | |
| CN108585810B (en) | Microporous ceramic, preparation method thereof and atomizing core | |
| CN113480327A (en) | Atomizing core, porous ceramic and preparation method of porous ceramic | |
| CN111205104A (en) | Porous ceramic for electronic cigarette and preparation method thereof | |
| CN111792922A (en) | High-reduction porous ceramic atomizing core and preparation method thereof | |
| CN109590473B (en) | Preparation method of porous titanium-based drug delivery atomizing core and atomizing heating component | |
| CN108610050A (en) | A kind of porous silicon carbide ceramic and preparation method thereof | |
| CN112321289B (en) | Preparation method of porous ceramic and atomizing core thereof | |
| KR20230164131A (en) | Microporous ceramic atomization core and method for manufacturing the same | |
| CN112778020B (en) | High-temperature porous ceramic and preparation method thereof | |
| CN112679202A (en) | Porous ceramic composition, preparation method thereof and electronic cigarette atomization core applying same | |
| CN111138175A (en) | Porous ceramic substrate, preparation method thereof and atomizing core | |
| CN114195494A (en) | High-strength porous ceramic for electronic cigarette and preparation method thereof | |
| CN108744029A (en) | A method of preparing PGA/DMBG Composite Bone holders using poly-dopamine modification mesoporous bioglass | |
| WO2024124786A1 (en) | Metalized porous ceramic composite material and preparation method therefor | |
| CN117865714A (en) | Ceramic powder, ceramic slurry and preparation method of porous ceramic | |
| CN108821451A (en) | A kind of antisludging agent particle and preparation method thereof | |
| CN114394849A (en) | Porous ceramic composite material and preparation method thereof | |
| CN116275106A (en) | Porous zirconium ferrovanadium getter and preparation method thereof | |
| CN112935242B (en) | Powder adhesive for powder metallurgy and preparation method thereof | |
| CN113979780A (en) | Porous zirconia ceramic and preparation method thereof | |
| CN111943690A (en) | Mullite mixed powder, preparation method thereof and application thereof in 3D printing | |
| CN115304397B (en) | Porous silicon dioxide ceramic raw material for atomization, porous silicon dioxide ceramic for atomization and preparation method and application of porous silicon dioxide ceramic | |
| CN115974579B (en) | Ceramic powder, preparation method thereof and porous ceramic matrix |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication |