CN110683839A - Porous ceramic and preparation method and application thereof - Google Patents
Porous ceramic and preparation method and application thereof Download PDFInfo
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- CN110683839A CN110683839A CN201911023170.0A CN201911023170A CN110683839A CN 110683839 A CN110683839 A CN 110683839A CN 201911023170 A CN201911023170 A CN 201911023170A CN 110683839 A CN110683839 A CN 110683839A
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- C04B38/00—Porous mortars, concrete, artificial stone or ceramic ware; Preparation thereof
- C04B38/06—Porous mortars, concrete, artificial stone or ceramic ware; Preparation thereof by burning-out added substances by burning natural expanding materials or by sublimating or melting out added substances
- C04B38/063—Preparing or treating the raw materials individually or as batches
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Abstract
The invention relates to porous ceramic and a preparation method and application thereof. The preparation method comprises the following steps: mixing and crushing diatomite, an environment-friendly pore-increasing agent, an inorganic fluxing agent, clay and an organic adhesive into uniform powder according to the requirements of different pore diameters; mixing the powder with water to prepare water system slurry with stable suspension performance; spray drying the water system slurry to prepare dry granulation powder; and carrying out dry pressing molding and sintering on the dry granulation powder to obtain the porous ceramic. The preparation method is beneficial to reducing the firing shrinkage rate, improving the product percent of pass, and has the advantages of simple process, low production cost, easy realization of automation, energy consumption saving and higher application and popularization values.
Description
Technical Field
The invention relates to the field of inorganic materials, in particular to porous ceramic and a preparation method and application thereof.
Background
The porous ceramic material has controllable pore structure, high porosity, high specific surface area, high temperature and high pressure resistance, acid and alkali resistance, organic medium corrosion resistance, long service life and good product regeneration performance, and can be widely applied to the fields of catalytic carrier materials, filtering materials, building materials and the like.
Diatomite is a nonmetallic mineral product formed by silicate remains after diatom death and can be used as a raw material for preparing porous ceramics. However, in the process of preparing the porous ceramic by using the diatomite, the defect of high sintering shrinkage rate exists, so that the product qualification rate is low.
Disclosure of Invention
Accordingly, there is a need for a method for producing a porous ceramic having a low firing shrinkage and a high product yield.
A method of preparing a porous ceramic, the method comprising the steps of:
mixing and crushing diatomite, an environment-friendly pore-increasing agent, an inorganic fluxing agent, clay and an organic adhesive into uniform powder according to the requirements of different pore diameters;
mixing the powder with water to prepare water system slurry with stable suspension performance;
spray drying the water system slurry to prepare dry granulation powder; and
and carrying out dry pressing molding and sintering on the dry granulation powder to obtain the porous ceramic.
In one embodiment, the diatomite has a particle size ranging from 1 to 200 microns, the environment-friendly pore-forming agent is used in an amount of 5 to 50 parts by weight, the inorganic fluxing agent is used in an amount of 5 to 20 parts by weight, the clay is used in an amount of 0.2 to 5 parts by weight, and the organic binder is used in an amount of 0.4 to 2 parts by weight, based on 100 parts by weight of the powder.
In one embodiment, the weight ratio of the powder to the water is 1: (0.5-1.5).
In one embodiment, the dry granulated powder has a particle size in the range of 40-300 mesh.
In one embodiment, the sintering temperature is 1100-1600 ℃.
Also provided is a porous ceramic prepared by the above method.
Also provides the application of the porous ceramic in the field of electronic devices or medical treatment.
In one embodiment, the porous ceramic is used to make an atomizer carrier or filter.
The method comprises the steps of firstly carrying out spray drying on the water-based premix containing the diatomite, then carrying out dry pressing molding on the obtained dry granulation powder and sintering, and is beneficial to reducing the sintering shrinkage and improving the product percent of pass. The method has the advantages of simple process, low production cost, easy realization of automation, energy consumption saving and higher application and popularization values.
Drawings
FIG. 1 is a schematic structural view of a porous ceramic prepared in example 1.
Detailed Description
To facilitate an understanding of the invention, the invention will now be described more fully with reference to the accompanying drawings. Preferred embodiments of the present invention are shown in the drawings. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
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 invention belongs. 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.
A method of preparing a porous ceramic of an embodiment, the method comprising the steps of:
s1: diatomite, an environment-friendly pore-increasing agent, an inorganic fluxing agent, clay and an organic adhesive are mixed and crushed into uniform powder according to the requirements of different pore diameters.
Wherein, the particle size of the diatomite can be 1-200 microns.
Wherein, the dosage of the environment-friendly pore-increasing agent, the inorganic fluxing agent, the clay and the organic adhesive can be changed within a wide range according to the aperture requirement of the porous ceramic to be prepared. In one embodiment, the environmentally friendly pore former may be used in an amount of 5 to 50 parts by weight, the inorganic flux in an amount of 5 to 20 parts by weight, the clay in an amount of 0.2 to 5 parts by weight, and the organic binder in an amount of 0.4 to 2 parts by weight, based on 100 parts by weight of the powder. The proportion is favorable for obtaining the porous ceramic with proper pore diameter and strength. In order to improve the mixing uniformity of the materials, the mixing can be carried out under stirring conditions.
Wherein the inorganic flux may be at least one selected from feldspar, dolomite, limestone, fluorite, talc and high temperature glass. The porous ceramic product has proper pore size and porosity by adding the environment-friendly pore-increasing agent, and particularly, the environment-friendly pore-increasing agent can be selected from at least one of shell activated carbon, wood fiber and starch. The addition of clay is advantageous for improving the strength of the porous ceramic product. The organic binder is advantageous for improving the binding strength between materials, and specifically, the organic binder may be at least one selected from the group consisting of carboxymethyl cellulose, polyallyl alcohol, starch, and polypropylene glycol.
S2: and mixing the powder with water to prepare the water system slurry with stable suspension performance.
Wherein, the weight ratio of the powder to the water can be 1: (0.5-1.5).
S4: and (3) carrying out spray drying on the water-based slurry to prepare dry granulation powder.
After spray drying, dry granulated powder with different particle sizes (for example, 40-300 meshes) and good flowability can be obtained.
S5: and carrying out dry pressing molding and sintering on the dry granulation powder to obtain the porous ceramic.
The dry pressing molding is beneficial to obtaining a green body with high strength and low rejection rate, the production period is short, and the automatic mass production is easy to realize. The dry-pressing may be carried out using equipment conventional in the art, for example using a CNC oil press or a mechanical press.
Wherein, the sintering temperature can be 1100-1600 ℃.
The method can effectively reduce the firing shrinkage rate and improve the product percent of pass, has simple process, low production cost, easy realization of automation, energy consumption saving and higher application and popularization values.
The porous ceramic prepared by the method has the characteristics of high strength, accurate and regular overall dimension and the like, the pore size and the porosity can be adjusted according to actual needs, and the porous ceramic has excellent comprehensive performance and lower cost. In one embodiment, the porous ceramic has a pore size of 1-100 μm, a porosity of 25-75%, and a flexural strength of 10MPa or more. The porous ceramic can be applied to the fields of electronic devices, medical treatment and the like, has wide application prospects, and can be used for preparing an atomizer carrier or a filter in one embodiment.
The invention is further illustrated, but not limited, by the following examples.
Example 1
Mixing diatomite with the granularity range of 1-200 microns, an environment-friendly pore-increasing agent, an inorganic fluxing agent, clay and an organic adhesive and crushing into uniform powder; wherein, based on 100 weight portions of powder, the usage of the environment-friendly pore-increasing agent is 5 to 50 weight portions, the usage of the inorganic fluxing agent is 5 to 20 weight portions, the usage of the clay is 0.2 to 5 weight portions, and the usage of the organic adhesive is 0.4 to 2 weight portions. Mixing the obtained powder with water to prepare water system slurry with stable suspension performance, wherein the weight ratio of the powder to the water is 1: (0.5-1.5). Then spray drying is carried out to prepare dry granulation powder with the particle size range of 40-300 meshes; and then dry-pressing and molding the dry granulation powder and sintering at 1100-1600 ℃ to obtain the porous ceramic.
The pore diameter of the micropores of the porous ceramic may be in the range of 1 μm to 100 μm. Preferably, the volume of micropores with a pore diameter of 5 μm to 30 μm in the porous ceramic accounts for 60% or more of the total micropore volume of the porous ceramic. Further, the average pore diameter of the porous ceramic is 10 to 35 μm, and more preferably 20 to 25 μm. Further, the pore diameter of the porous ceramic is 10 μm to 15 μm. Further, the volume of the micropores having a pore diameter of 10 to 15 μm accounts for 20% or more of the volume of all the micropores in the porous ceramic, and the volume of the micropores having a pore diameter of 30 to 50 μm accounts for about 30% of the volume of all the micropores in the porous ceramic. The porous ceramic has a porosity of 30% to 70%, wherein the porosity is a ratio of a total volume of micropores in the porous ceramic to a total volume of the porous ceramic.
The porous ceramic has a shape shown in fig. 1, and can be used for an electronic atomization device, especially an electronic cigarette. The porous ceramic has stable chemical properties, can not generate chemical reaction with smoke liquid, can resist high temperature, is an insulator, and can not generate short circuit and other problems due to electric connection with a porous membrane formed on the porous ceramic.
The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (8)
1. A method for preparing a porous ceramic, comprising the steps of:
mixing and crushing diatomite, an environment-friendly pore-increasing agent, an inorganic fluxing agent, clay and an organic adhesive into uniform powder according to the requirements of different pore diameters;
mixing the powder with water to prepare water system slurry with stable suspension performance;
spray drying the water system slurry to prepare dry granulation powder; and
and carrying out dry pressing molding and sintering on the dry granulation powder to obtain the porous ceramic.
2. The method according to claim 1, wherein the diatomaceous earth has a particle size ranging from 1 to 200 μm, the eco-friendly pore-increasing agent is used in an amount of 5 to 50 parts by weight, the inorganic flux is used in an amount of 5 to 20 parts by weight, the clay is used in an amount of 0.2 to 5 parts by weight, and the organic binder is used in an amount of 0.4 to 2 parts by weight, based on 100 parts by weight of the powder.
3. The method according to claim 1, wherein the weight ratio of said powder to said water is 1: (0.5-1.5).
4. The method of claim 1, wherein the dry granulated powder has a particle size in the range of 40 to 300 mesh.
5. The method as claimed in claim 1, wherein the sintering temperature is 1100-1600 ℃.
6. A porous ceramic produced by the production method according to any one of claims 1 to 5.
7. Use of the porous ceramic according to claim 6 in the field of electronic devices or medical fields.
8. Use according to claim 7, wherein the porous ceramic is used for the preparation of an atomizer carrier or filter.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111728273A (en) * | 2020-05-15 | 2020-10-02 | 深圳麦克韦尔科技有限公司 | Gradient porous material, preparation method thereof, atomizer and electronic atomization device |
| CN112939624A (en) * | 2021-04-21 | 2021-06-11 | 长沙友创陶瓷科技有限公司 | Preparation process of porous heat-insulating ceramic material |
| CN114478052A (en) * | 2022-01-17 | 2022-05-13 | 刘松青 | Preparation method of high-strength electronic cigarette ceramic atomizing core |
| CN115073154A (en) * | 2022-07-27 | 2022-09-20 | 深圳市吉迩科技有限公司 | Composite porous ceramic atomizing core and preparation method thereof |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111728273A (en) * | 2020-05-15 | 2020-10-02 | 深圳麦克韦尔科技有限公司 | Gradient porous material, preparation method thereof, atomizer and electronic atomization device |
| WO2021227818A1 (en) * | 2020-05-15 | 2021-11-18 | 深圳麦克韦尔科技有限公司 | Gradient porous material, preparation method therefor, atomizer and electronic atomization device |
| CN112939624A (en) * | 2021-04-21 | 2021-06-11 | 长沙友创陶瓷科技有限公司 | Preparation process of porous heat-insulating ceramic material |
| CN114478052A (en) * | 2022-01-17 | 2022-05-13 | 刘松青 | Preparation method of high-strength electronic cigarette ceramic atomizing core |
| CN115073154A (en) * | 2022-07-27 | 2022-09-20 | 深圳市吉迩科技有限公司 | Composite porous ceramic atomizing core and preparation method thereof |
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