CN115959925B - Porous ceramic with double-layer structure and preparation method and application thereof - Google Patents
Porous ceramic with double-layer structure and preparation method and application thereof Download PDFInfo
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- CN115959925B CN115959925B CN202211604169.9A CN202211604169A CN115959925B CN 115959925 B CN115959925 B CN 115959925B CN 202211604169 A CN202211604169 A CN 202211604169A CN 115959925 B CN115959925 B CN 115959925B
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- 239000000919 ceramic Substances 0.000 title claims abstract description 87
- 238000002360 preparation method Methods 0.000 title claims abstract description 11
- 238000001746 injection moulding Methods 0.000 claims abstract description 108
- 239000002994 raw material Substances 0.000 claims abstract description 100
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 39
- 239000004094 surface-active agent Substances 0.000 claims abstract description 29
- 239000011230 binding agent Substances 0.000 claims abstract description 28
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical group O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 23
- 239000004115 Sodium Silicate Substances 0.000 claims description 23
- BRPQOXSCLDDYGP-UHFFFAOYSA-N calcium oxide Chemical compound [O-2].[Ca+2] BRPQOXSCLDDYGP-UHFFFAOYSA-N 0.000 claims description 23
- 239000000292 calcium oxide Substances 0.000 claims description 23
- ODINCKMPIJJUCX-UHFFFAOYSA-N calcium oxide Inorganic materials [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 claims description 23
- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical compound [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 claims description 23
- 229910052911 sodium silicate Inorganic materials 0.000 claims description 23
- 229920003229 poly(methyl methacrylate) Polymers 0.000 claims description 21
- 239000004926 polymethyl methacrylate Substances 0.000 claims description 21
- 235000013871 bee wax Nutrition 0.000 claims description 19
- 239000012166 beeswax Substances 0.000 claims description 19
- 239000012188 paraffin wax Substances 0.000 claims description 19
- RYYKJJJTJZKILX-UHFFFAOYSA-M sodium octadecanoate Chemical group [Na+].CCCCCCCCCCCCCCCCCC([O-])=O RYYKJJJTJZKILX-UHFFFAOYSA-M 0.000 claims description 19
- 238000005245 sintering Methods 0.000 claims description 17
- 238000005238 degreasing Methods 0.000 claims description 12
- 238000010438 heat treatment Methods 0.000 claims description 12
- 239000000443 aerosol Substances 0.000 claims description 6
- 238000002156 mixing Methods 0.000 claims description 5
- 238000004898 kneading Methods 0.000 claims description 4
- 238000004321 preservation Methods 0.000 claims description 2
- 239000012778 molding material Substances 0.000 abstract description 4
- 239000010410 layer Substances 0.000 description 50
- 230000000052 comparative effect Effects 0.000 description 15
- 229910010293 ceramic material Inorganic materials 0.000 description 9
- 238000000034 method Methods 0.000 description 8
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 8
- 239000011148 porous material Substances 0.000 description 6
- 239000005909 Kieselgur Substances 0.000 description 5
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 238000001816 cooling Methods 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000001914 filtration Methods 0.000 description 2
- 238000000465 moulding Methods 0.000 description 2
- 238000011056 performance test Methods 0.000 description 2
- 239000002356 single layer Substances 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 241001391944 Commicarpus scandens Species 0.000 description 1
- 241000196324 Embryophyta Species 0.000 description 1
- 239000002202 Polyethylene glycol Substances 0.000 description 1
- 239000004793 Polystyrene Substances 0.000 description 1
- DBMJMQXJHONAFJ-UHFFFAOYSA-M Sodium laurylsulphate Chemical compound [Na+].CCCCCCCCCCCCOS([O-])(=O)=O DBMJMQXJHONAFJ-UHFFFAOYSA-M 0.000 description 1
- 229920002472 Starch Polymers 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 238000006555 catalytic reaction Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N iron oxide Inorganic materials [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- NDLPOXTZKUMGOV-UHFFFAOYSA-N oxo(oxoferriooxy)iron hydrate Chemical compound O.O=[Fe]O[Fe]=O NDLPOXTZKUMGOV-UHFFFAOYSA-N 0.000 description 1
- 229920001223 polyethylene glycol Polymers 0.000 description 1
- 229920002223 polystyrene Polymers 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 238000007569 slipcasting Methods 0.000 description 1
- 235000019698 starch Nutrition 0.000 description 1
- 239000008107 starch Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 230000008093 supporting effect Effects 0.000 description 1
- 238000010345 tape casting Methods 0.000 description 1
- XOOUIPVCVHRTMJ-UHFFFAOYSA-L zinc stearate Chemical compound [Zn+2].CCCCCCCCCCCCCCCCCC([O-])=O.CCCCCCCCCCCCCCCCCC([O-])=O XOOUIPVCVHRTMJ-UHFFFAOYSA-L 0.000 description 1
Classifications
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P40/00—Technologies relating to the processing of minerals
- Y02P40/60—Production of ceramic materials or ceramic elements, e.g. substitution of clay or shale by alternative raw materials, e.g. ashes
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- Compositions Of Oxide Ceramics (AREA)
Abstract
The invention discloses a porous ceramic with a double-layer structure, and a preparation method and application thereof, and relates to the technical field of porous ceramics. The porous ceramic of double-layer structure comprises: a first injection molding material and a second injection molding material; the first injection molding raw material comprises the following components in percentage by mass: 45-60% of aggregate, 10-28% of pore-forming agent, 18-40% of binder and 0.5-2% of surfactant; the second injection molding raw material comprises the following components in percentage by mass: 45-60% of aggregate, 10-40% of pore-forming agent, 20-35% of binder and 0.5-2% of surfactant; the pore-forming agent content of the first injection molding raw material is different from that of the second injection molding raw material. According to the invention, two injection molding raw materials with different pore-forming agent contents are subjected to double injection molding to prepare a ceramic blank with double layers of raw materials, and then the ceramic blank is sintered to obtain the porous ceramic with distinct layers and different layers of porosities.
Description
Technical Field
The invention relates to the technical field of porous ceramics, in particular to a double-layer structure porous ceramic, and a preparation method and application thereof.
Background
The porous ceramic has the advantages of ceramic material and porous structure, and has the advantages of high porosity, small volume density, high specific surface area, stable chemical property, high temperature resistance, corrosion resistance, low thermal conductivity and the like, so that the porous ceramic is widely applied as a heat insulation, catalysis and filtration material, and along with the development of modern industry, the application range of the porous ceramic is continuously widened, and the requirements on the performance of the porous ceramic are continuously improved. However, the existing preparation process of the porous ceramic usually adopts a slip casting or tape casting method, the production period of the method is long, the process is complex and tedious, the prepared porous ceramic is mostly single-layer ceramic materials, and the single-layer ceramic materials often have the defect of single porosity and pore diameter, so that the method is insufficient for meeting the requirements of people on the increasingly growing performance of the porous ceramic. The ceramic material with the double-layer structure can further improve the performances of the ceramic material such as the supporting property, the filtering property and the like due to the fact that the porosities of all layers are different, and the structural design of the double layers and the porosity of all layers is adopted, so that the important point and the difficulty of research on how to realize the material combination between the layers are always achieved. Thus, there remains a need for a well-defined porous ceramic material having two pore sizes and porosities.
Disclosure of Invention
The invention aims to overcome the defects and shortcomings of the prior art and prepare the double-layer structure porous ceramic with distinct layers, two pore diameters and porosity.
In order to solve the technical problems, the invention provides a porous ceramic with a double-layer structure, and a preparation method and application thereof. The method specifically comprises the following technical scheme:
In a first aspect, a porous ceramic of a double-layer structure is provided, comprising a first injection molding material and a second injection molding material;
The first injection molding raw material comprises the following components in percentage by mass:
The second injection molding raw material comprises the following components in percentage by mass:
the aggregate is at least one of diatomite, alumina, sodium silicate, ferric oxide and calcium oxide; the pore-forming agent content of the first injection molding raw material is different from that of the second injection molding raw material.
Further, the pore-forming agent is at least one of starch, plant ash and polymethyl methacrylate.
Further, the binder is at least one of paraffin wax, beeswax, polyethylene glycol and polystyrene.
Further, the surfactant is one of sodium stearate, sodium dodecyl sulfate and zinc stearate.
Further, the porous ceramic with the double-layer structure comprises a first injection molding raw material and a second injection molding raw material;
The first injection molding raw material comprises the following components in percentage by mass:
The second injection molding raw material comprises the following components in percentage by mass:
The aggregate is diatomite, sodium silicate and calcium oxide; the pore-forming agent is polymethyl methacrylate; the binder is paraffin wax and beeswax; the surfactant is sodium stearate.
In a second aspect, there is provided a method for preparing the porous ceramic with a double-layer structure according to the first aspect, comprising the steps of:
s1, adding aggregate, pore-forming agent, binder and surfactant into a kneader according to mass percent, kneading for 3-6 hours at 100-120 ℃ to obtain a first injection molding raw material and a second injection molding raw material,
S2, carrying out double injection molding on the first injection molding raw material and the second injection molding raw material by an injection molding machine at 60+/-3 ℃ and injection molding pressure of 20+/-3 MPa to obtain a ceramic green body of a double-layer raw material,
S3, placing the ceramic green body into a degreasing sintering furnace for thermal degreasing,
S4, placing the degreased ceramic blank body into a sintering furnace for high-temperature sintering to obtain the porous ceramic with the double-layer structure.
Further, the step S1 further comprises the step of adding the aggregate and the pore-forming agent into a three-dimensional mixer in advance for fully mixing.
Further, the thermal degreasing in the step S3 is to heat up the ceramic green body at the temperature of 0-600 ℃ at the speed of 0.5 ℃/min and then keep the temperature for 3 hours, thus obtaining a degreased ceramic green body.
Further, the high-temperature sintering in the step S4 is to heat the degreased ceramic blank to 1000-1150 ℃ at a heating rate of 5 ℃/min, and naturally cool the ceramic blank after heat preservation for 2 hours to obtain the porous ceramic with the double-layer structure.
In a third aspect, there is provided the use of a bilayer structured porous ceramic according to the first aspect in an aerosol atomizer.
The invention prepares a ceramic blank body of double-layer raw materials by performing double-shot forming on two injection molding raw materials with different pore-forming agent contents, and then obtains the porous ceramic with distinct layers and different layers of porosities through sintering; other raw materials can be better bonded through the adhesive, and the phenomenon of raw material separation in the ceramic injection molding process is avoided; the components in the aggregate can be uniformly mixed through the surfactant, so that the toughness of the ceramic material is enhanced, and the prepared ceramic material is not easy to break.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for the description of the embodiments will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic structural view of a porous ceramic with a double layer structure according to example 1 of the present invention.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely, and it is apparent that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
It should be understood that the terms "comprises" and "comprising," when used in this specification and the appended claims, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof.
It is also to be understood that the terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used in this specification and the appended claims, the singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise.
It should be further understood that the term "and/or" as used in the present specification and the appended claims refers to any and all possible combinations of one or more of the associated listed items, and includes such combinations.
In order to more fully understand the technical content of the present invention, the following description and description of the technical solution of the present invention will be further presented with reference to specific embodiments.
The preparation method of the porous ceramic with the double-layer structure comprises the following steps:
s1, adding aggregate, pore-forming agent, binder and surfactant into a kneader according to mass percent, kneading for 3-6 hours at 100-120 ℃ to obtain a first injection molding raw material and a second injection molding raw material,
S2, carrying out double injection molding on the first injection molding raw material and the second injection molding raw material by an injection molding machine at 60+/-3 ℃ and injection molding pressure of 20+/-3 MPa to obtain a ceramic green body of a double-layer raw material,
S3, placing the ceramic green body into a degreasing sintering furnace, heating at the temperature of 0-600 ℃ at the speed of 0.5 ℃/min, and then preserving heat for 3 hours for thermal degreasing,
S4, placing the degreased ceramic blank body into a sintering furnace for high-temperature sintering to obtain the porous ceramic with the double-layer structure.
In the step S1, the aggregate and the pore-forming agent are added into a three-dimensional mixer in advance for full mixing, and the mixing time is 5 hours.
The step S1 further comprises granulating the first injection molding raw material and the second injection molding raw material so that the granularity of the first injection molding raw material is the same as that of the second injection molding raw material.
In step S2, the first injection molding raw material and the second injection molding raw material are molded on the same injection molding machine, the injection molding machine is equipped with two systems for discharging simultaneously, and the ceramic green body with double-layer raw materials is obtained by layered molding in a molding die. Since the main components of both raw materials are the same, the combination of the two raw materials is superior.
Specifically, step S3 is to place the ceramic green body in an alumina sagger, then thermally degreasing the ceramic green body in a degreasing sintering furnace, heating to 200 ℃ at 0.5 ℃/min, preserving heat for 1h, heating to 400 ℃ at 0.5 ℃/min, preserving heat for 1h, heating to 600 ℃ at 0.5 ℃/min, and preserving heat for 1h to obtain a degreased ceramic green body.
And S4, sintering at a high temperature, namely heating the degreased ceramic blank to 1000-1150 ℃ at a heating rate of 5 ℃/min, preserving heat for 2 hours, and naturally cooling to obtain the porous ceramic with the double-layer structure.
Example 1
The porous ceramic with the double-layer structure comprises a first injection molding raw material and a second injection molding raw material;
The first injection molding raw material comprises the following components in percentage by mass: aggregate (diatomite, sodium silicate and calcium oxide) 50%, pore-forming agent (polymethyl methacrylate) 20%, binder (paraffin 23% and beeswax 5%) 28%, and surfactant (sodium stearate) 2%;
the second injection molding raw material comprises the following components in percentage by mass: aggregate (diatomaceous earth, sodium silicate and calcium oxide) 58%, pore-forming agent (polymethyl methacrylate) 14%, binder (paraffin 21% and beeswax 5%) 26%, surfactant (sodium stearate) 2%.
The preparation method of the porous ceramic with the double-layer structure in the embodiment is as follows:
S1, adding aggregate and a pore-forming agent into a three-dimensional mixer, mixing for 5 hours, adding the mixed aggregate, the pore-forming agent, a binder and a surfactant into a kneader according to mass percent, kneading for 3 hours at 120 ℃ to obtain a first injection molding raw material and a second injection molding raw material, and granulating the first injection molding raw material and the second injection molding raw material to ensure that the granularity of the first injection molding raw material is the same as that of the second injection molding raw material;
S2, carrying out double injection molding on the first injection molding raw material and the second injection molding raw material by an injection molding machine at 60 ℃ and injection pressure of 20MPa, so that the first injection molding raw material is arranged on the upper layer of the second injection molding raw material to obtain a ceramic green body with double layers of raw materials,
S3, placing the ceramic green body in an alumina sagger, then performing thermal degreasing in a degreasing sintering furnace, heating to 200 ℃ at 0.5 ℃/min, preserving heat for 1h, heating to 400 ℃ at 0.5 ℃/min, preserving heat for 1h, heating to 600 ℃ at 0.5 ℃/min, and preserving heat for 1h to obtain a degreased ceramic green body;
s4, placing the degreased ceramic blank body into a sintering furnace for high-temperature sintering, heating to 1150 ℃, preserving heat for 2 hours, and naturally cooling to obtain the porous ceramic with the double-layer structure. The schematic structure is shown in fig. 1.
The double-layer structured porous ceramics of examples 2 to 4 and comparative examples 1 to 6 were produced in the same manner as in example 1.
Example 2
The porous ceramic with the double-layer structure comprises a first injection molding raw material and a second injection molding raw material;
The first injection molding raw material comprises the following components in percentage by mass: aggregate (diatomite, sodium silicate and calcium oxide) 54%, pore-forming agent (polymethyl methacrylate) 23%, binder (paraffin 15% and beeswax 6%) 21%, surfactant (sodium stearate) 2%;
The second injection molding raw material comprises the following components in percentage by mass: aggregate (diatomaceous earth, sodium silicate and calcium oxide) 59%, pore-forming agent (polymethyl methacrylate) 18%, binder (paraffin 15% and beeswax 6%) 21%, surfactant (sodium stearate) 2%.
Example 3
The porous ceramic with the double-layer structure comprises a first injection molding raw material and a second injection molding raw material;
The first injection molding raw material comprises the following components in percentage by mass: aggregate (diatomite, sodium silicate and calcium oxide) 50%, pore-forming agent (polymethyl methacrylate) 25%, binder (paraffin 20% and beeswax 3%) 23%, and surfactant (sodium stearate) 2%;
the second injection molding raw material comprises the following components in percentage by mass: aggregate (diatomaceous earth, sodium silicate and calcium oxide) 54%, pore-forming agent (polymethyl methacrylate) 24%, binder (paraffin 15% and beeswax 5%), surfactant (sodium stearate) 2%.
Example 4
The porous ceramic with the double-layer structure comprises a first injection molding raw material and a second injection molding raw material;
The first injection molding raw material comprises the following components in percentage by mass: aggregate (diatomite, sodium silicate and calcium oxide) 50%, pore-forming agent (polymethyl methacrylate) 20%, binder (paraffin 22% and beeswax 7%) 29%, surfactant (sodium stearate) 1%;
The second injection molding raw material comprises the following components in percentage by mass: 55% of aggregate (diatomite, sodium silicate and calcium oxide), 24% of pore-forming agent (polymethyl methacrylate), 20% of binder (paraffin 15% and beeswax 5%) and 1% of surfactant (sodium stearate).
Comparative example 1
The porous ceramic with the double-layer structure comprises a first injection molding raw material and a second injection molding raw material;
The first injection molding raw material comprises the following components in percentage by mass: 50% of aggregate (diatomite, sodium silicate and calcium oxide), 28% of binder (paraffin 23% and beeswax 5%), 2% of surfactant (sodium stearate) and the balance of water;
the second injection molding raw material comprises the following components in percentage by mass: 58% of aggregate (diatomite, sodium silicate and calcium oxide), 26% of binder (paraffin 21% and beeswax 5%), 2% of surfactant (sodium stearate) and the balance of water.
Comparative example 2
The porous ceramic with the double-layer structure comprises a first injection molding raw material and a second injection molding raw material;
The first injection molding raw material comprises the following components in percentage by mass: aggregate (diatomite, sodium silicate and calcium oxide) 50%, pore-forming agent (polymethyl methacrylate) 20%, binder (paraffin 23% and beeswax 5%) 28%, and surfactant (sodium stearate) 2%;
The second injection molding raw material comprises the following components in percentage by mass: aggregate (diatomaceous earth, sodium silicate and calcium oxide) 58%, pore-forming agent (polymethyl methacrylate) 20%, binder (paraffin 15% and beeswax 5%) 20%, and surfactant (sodium stearate) 2%.
Comparative example 3
The porous ceramic with the double-layer structure comprises a first injection molding raw material and a second injection molding raw material;
the first injection molding raw material comprises the following components in percentage by mass: aggregate (diatomite, sodium silicate and calcium oxide) 50%, pore-forming agent (polymethyl methacrylate) 30%, binder (paraffin 15% and beeswax 3%) 18%, surfactant (sodium stearate) 2%;
the second injection molding raw material comprises the following components in percentage by mass: aggregate (diatomaceous earth, sodium silicate and calcium oxide) 58%, pore-forming agent (polymethyl methacrylate) 14%, binder (paraffin 21% and beeswax 5%) 26%, surfactant (sodium stearate) 2%.
Comparative example 4
The porous ceramic with the double-layer structure comprises a first injection molding raw material and a second injection molding raw material;
The first injection molding raw material comprises the following components in percentage by mass: aggregate (diatomite, sodium silicate and calcium oxide) 50%, pore-forming agent (polymethyl methacrylate) 20%, surfactant (sodium stearate) 2% and water in balance;
The second injection molding raw material comprises the following components in percentage by mass: aggregate (diatomite, sodium silicate and calcium oxide) 58%, pore-forming agent (polymethyl methacrylate) 14%, surfactant (sodium stearate) 2% and the balance of water.
Comparative example 5
The porous ceramic with the double-layer structure comprises a first injection molding raw material and a second injection molding raw material;
The first injection molding raw material comprises the following components in percentage by mass: aggregate (diatomite, sodium silicate and calcium oxide) 50%, pore-forming agent (polymethyl methacrylate) 20%, binder (paraffin 23% and beeswax 5%) 28% and water in balance;
The second injection molding raw material comprises the following components in percentage by mass: aggregate (diatomite, sodium silicate and calcium oxide) 58%, pore-forming agent (polymethyl methacrylate) 14%, binder (paraffin 21% and beeswax 5%) 26% and water in balance.
Comparative example 6
The porous ceramic with the double-layer structure comprises a first injection molding raw material and a second injection molding raw material;
the first injection molding raw material comprises the following components in percentage by mass: aggregate (diatomite, sodium silicate and calcium oxide) 50%, pore-forming agent (polymethyl methacrylate) 20% and water in balance;
The second injection molding raw material comprises the following components in percentage by mass: 58% of aggregate (diatomite, sodium silicate and calcium oxide), 14% of pore-forming agent (polymethyl methacrylate) and the balance of water.
The double-layer structured porous ceramics of examples 1 to 4 and comparative examples 1 to 6 were subjected to performance test, and the test results are shown in Table 1:
TABLE 1 results of double-layer porous ceramic Performance test of examples 1-4 and comparative examples 1-6
As can be seen from the test results in Table 1, the porous ceramic with double-layer structure prepared by the preparation method provided by the invention has the advantages of high porosity, large pore diameter and high oil guiding rate, and when the porous ceramic with double-layer structure does not contain pore-forming agent (comparative example 1) or binder (comparative example 4) or surfactant (comparative example 5), the porous ceramic with double-layer structure has the advantages of lower porosity, smaller pore diameter and low oil guiding rate. And the double-layer structured porous ceramics may be less effective in the absence of multiple components (comparative example 6) than in the absence of a single component (comparative example 4, comparative example 5).
In summary, compared with the prior art, the porous ceramic with the double-layer structure has the following advantages:
1. the porous ceramic with a double-layer structure is prepared, and meanwhile, the combination of double-layer materials is ensured;
2. the preparation process is simple, the forming process can be completed once, and the process parameters are easy to control;
3. the prepared ceramic material with the double-layer structure has distinct pore diameter and porosity, and can be better applied to aerosol atomizers.
While the invention has been described with reference to certain preferred embodiments, it will be understood by those skilled in the art that various changes and substitutions of equivalents may be made and equivalents will be apparent to those skilled in the art without departing from the scope of the invention. Therefore, the protection scope of the invention is subject to the protection scope of the claims.
Claims (4)
1. The application of the porous ceramic with the double-layer structure in the aspect of aerosol atomizers is characterized in that,
The porous ceramic with the double-layer structure comprises a first injection molding raw material and a second injection molding raw material;
The first injection molding raw material comprises the following components in percentage by mass:
50-55% of aggregate,
20-25% Of pore-forming agent,
20-30% Of binder,
1-2% Of a surfactant;
The mass percentage of the first injection molding raw material is 100 percent;
The second injection molding raw material comprises the following components in percentage by mass:
55-60% of aggregate,
10-24% Of pore-forming agent,
20-30% Of binder,
1-2% Of a surfactant;
The pore-forming agent content of the first injection molding raw material is different from that of the second injection molding raw material; the aggregate is diatomite, sodium silicate and calcium oxide; the pore-forming agent is polymethyl methacrylate; the binder is paraffin wax and beeswax; the surfactant is sodium stearate;
The preparation method of the porous ceramic with the double-layer structure comprises the following steps:
s1, adding aggregate, pore-forming agent, binder and surfactant into a kneader according to mass percent, kneading for 3-6 hours at 100-120 ℃ to obtain a first injection molding raw material and a second injection molding raw material,
S2, carrying out double injection molding on the first injection molding raw material and the second injection molding raw material by an injection molding machine at 60+/-3 ℃ and injection molding pressure of 20+/-3 MPa to obtain a ceramic green body with double layers of raw materials,
S3, placing the ceramic green compact into a degreasing sintering furnace for thermal degreasing,
S4, placing the degreased ceramic blank body into a sintering furnace for high-temperature sintering to obtain the porous ceramic with the double-layer structure.
2. The use of the porous ceramic with double-layer structure according to claim 1 in aerosol atomizer, wherein said step S1 further comprises the step of adding the aggregate and the pore-forming agent into a three-dimensional mixer in advance for complete mixing.
3. The application of the porous ceramic with the double-layer structure in the aspect of an aerosol atomizer according to claim 2, wherein the thermal degreasing in the step S3 is to heat-insulating a ceramic green body for 3 hours after the ceramic green body is heated at a speed of 0-600 ℃ and a speed of 0.5 ℃/min, so as to obtain a degreased ceramic green body.
4. The application of the porous ceramic with the double-layer structure in the aspect of an aerosol atomizer as claimed in claim 3, wherein the high-temperature sintering in the step S4 is to heat up the degreased ceramic blank to 1000-1150 ℃ at a heating rate of 5 ℃/min, and then to cool naturally after heat preservation for 2 hours to obtain the porous ceramic with the double-layer structure.
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| CN202211604169.9A CN115959925B (en) | 2022-12-13 | 2022-12-13 | Porous ceramic with double-layer structure and preparation method and application thereof |
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| CN202211604169.9A CN115959925B (en) | 2022-12-13 | 2022-12-13 | Porous ceramic with double-layer structure and preparation method and application thereof |
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| CN115959925A CN115959925A (en) | 2023-04-14 |
| CN115959925B true CN115959925B (en) | 2024-04-23 |
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