CN108083789A - Porous mullite ceramics and preparation method thereof - Google Patents
Porous mullite ceramics and preparation method thereof Download PDFInfo
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- CN108083789A CN108083789A CN201711271113.5A CN201711271113A CN108083789A CN 108083789 A CN108083789 A CN 108083789A CN 201711271113 A CN201711271113 A CN 201711271113A CN 108083789 A CN108083789 A CN 108083789A
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- C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/01—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics
- C04B35/16—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics based on silicates other than clay
- C04B35/18—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics based on silicates other than clay rich in aluminium oxide
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Abstract
The invention belongs to porous ceramic film material technical fields more particularly to a kind of porous mullite ceramics and preparation method thereof：The porous mullite ceramics are reacted by activated alumina, silicon powder, sillimanite, flyash, zirlite and water to be generated；Porous mullite ceramics prepared by the present invention decompose generation perforation shape stomata in situ using raw material itself, avoid because addition pore creating material forms CO2Secondary pollution is caused, is conducive to environmental protection；Raw material reaction in-situ generation mullite after decomposition, form mullite directly in conjunction with porous mullite ceramics, there is more preferably high-temperature behavior, meanwhile, also have the advantages that apparent porosity, air vent aperture are controllable.
Description
Technical field
The invention belongs to porous ceramic film material technical field more particularly to a kind of porous mullite ceramics and its preparation sides
Method.
Background technology
As material science and technology height is fast-developing, recent years, porous material is as the new material that function is complete, performance is excellent
Get the attention and apply, especially battery electrode dielectric field, catalyst support applications, gas sensing field,
Heat-barrier material field, ion-exchange field, hot gas/melted metal filtering field, purification water purification field etc. have highlighted its uniqueness
Glamour.
Mullite (3Al2O3·2SiO2) it is Al under normal pressure2O3-2SiO2The most stable of manosil AS of thermodynamics in binary system
Salt, it is excellent that porous mullite material even more has both the low coefficient of thermal expansion that mullite material has, thermal shock resistance and creep-resistant property
It still is able to keep particularly preferred mechanical performance and chemical stability under good and hot conditions, and its unique porosity height is even more
Its application field is widened.Thus, the preparation process of porous mullite correlation stretching material, performance characteristics and application in recent years
Research receives the concern of numerous scholars, and has tremendous development；Especially in terms of catalyst carrier is done, do not come due to porous
The exclusive porosity of stone is high, imparts the advantages that its load capacity is big, air resistance is small and supported catalyst is active good, this also allows more
Hole mullite material is paid close attention in terms of vehicle tail gas catalyst carrier research.
The content of the invention
The object of the present invention is to provide the controllable porous mullite ceramics of a kind of environmental-friendly, pore size and volume content
Preparation method, the porous mullite ceramics strength that is prepared with this method is high, good permeability and high-temperature behavior are good.
To achieve the above object, the technical solution adopted by the present invention is：To achieve the above object, the technology that the present invention uses
Scheme is：
The porous mullite ceramics are reacted by activated alumina, silicon powder, sillimanite, flyash, zirlite and water
Generation, it is total with the activated alumina, the silicon powder, the sillimanite, the flyash, the zirlite and the water
On the basis of quality, by the activated alumina of 15-30 mass %, the silicon powder of 15-25 mass %, 10-15 mass %
The sillimanite, the flyash of 12-20 mass % and the zirlite, the 12-20 mass % of 10~18 mass %
Water mixing, be then pressed into type, then by the green body after shaping under the conditions of 220 DEG C it is dry 24~36 it is small when, then by base
Body keeps the temperature 3-6h under the conditions of 1400-1600 DEG C and burns till.
In the present invention, the grain size of the bastard coal mountain flour, 3 powder of Al (OH), talcum powder, magnesite powder and Cab-O-sil is small
In 58 μm.
In the present invention, the mode of the compression moulding is manual ramming.
The present invention also provides a kind of porous mullite ceramics as prepared by the above method for second aspect.
Due to the adoption of the above technical scheme, the present invention decomposes generation perforation shape stomata in situ using raw material itself, avoids
Because addition pore creating material forms CO2Secondary pollution is caused, is conducive to environmental protection；Raw material reaction in-situ generation after decomposition does not come
Stone, form mullite directly in conjunction with porous mullite ceramics, there is more preferably high-temperature behavior.Meanwhile also with apparent pore
The advantages of rate, controllable air vent aperture.
Porous mullite ceramics prepared by the present invention：Main object is mutually mullite, and air hole structure is to penetrate through shape, apparent pore
Rate is 40~55%, and average pore size is 35~80 μm, and bulk density is 1.58~1.82g/cm3, and mullite is directly in conjunction with room temperature
Compressive resistance is the product of 40~65MPa.
Therefore, the present invention has the characteristics that environmental-friendly, pore size and volume content are controllable, and prepared is porous not next
Feldspar intensity is high, good permeability and high-temperature behavior are good.
Specific embodiment
The invention will be further described With reference to embodiment, not to the limitation of its protection domain.
Embodiment 1
A kind of preparation method of porous mullite ceramics, comprises the following steps：
By the activated alumina of 18-30 mass %, the silicon powder of 18-25 mass %, 12-15 mass % institute
State sillimanite, the zirlite of the flyash of 14-20 mass % and 10~18 mass %, the institute of 12-20 mass %
State water mixing, be then pressed into type, then by the green body after shaping under the conditions of 220 DEG C it is dry 24~36 it is small when, then green body existed
3-6h is kept the temperature under the conditions of 1400-1600 DEG C to burn till.
Porous mullite ceramics prepared by the method for the present embodiment：Main object is mutually mullite, and air hole structure is perforation
Shape, apparent porosity are 50~55%, and average pore size is 50~80 μm, and bulk density is 1.58~1.82g/cm3, and mullite is direct
With reference to the porous mullite ceramics that cold crushing strength is 40~65Mpa.
Embodiment 2
A kind of preparation method of porous mullite ceramics, comprises the following steps：
By the activated alumina of 20-30 mass %, the silicon powder of 18-25 mass %, 12-15 mass % institute
State sillimanite, the zirlite of the flyash of 16-20 mass % and 12~18 mass %, the institute of 12-20 mass %
State water mixing, be then pressed into type, then by the green body after shaping under the conditions of 220 DEG C it is dry 28~36 it is small when, then green body existed
3-6h is kept the temperature under the conditions of 1500-1600 DEG C to burn till.
Porous mullite ceramics prepared by the method for the present embodiment：Main object is mutually mullite, and air hole structure is perforation
Shape, apparent porosity are 50~55%, and average pore size is 60~80 μm, and bulk density is 1.65~1.82g/cm3, and mullite is direct
With reference to the porous mullite ceramics that cold crushing strength is 45~65Mpa.
Embodiment 3
A kind of preparation method of porous mullite ceramics, comprises the following steps：
By the activated alumina of 18-30 mass %, the silicon powder of 18-25 mass %, 12-15 mass % institute
State sillimanite, the zirlite of the flyash of 16-20 mass % and 10~18 mass %, the institute of 12-20 mass %
State water mixing, be then pressed into type, then by the green body after shaping under the conditions of 220 DEG C it is dry 24~36 it is small when, then green body existed
5-6h is kept the temperature under the conditions of 1550-1600 DEG C to burn till..
Porous mullite ceramics prepared by the method for the present embodiment：Main object is mutually mullite, and air hole structure is perforation
Shape, apparent porosity are 52~55%, and average pore size is 50~80 μm, and bulk density is 1.66~1.82g/cm3, and mullite is direct
With reference to the porous mullite ceramics that cold crushing strength is 48~65Mpa.
Embodiment 4
A kind of preparation method of porous mullite ceramics, comprises the following steps：
By the activated alumina of 25-30 mass %, the silicon powder of 18-25 mass %, 12-15 mass % institute
State sillimanite, the zirlite of the flyash of 14-20 mass % and 12~18 mass %, the institute of 14-20 mass %
State water mixing, be then pressed into type, then by the green body after shaping under the conditions of 220 DEG C it is dry 24~36 it is small when, then green body existed
3-6h is kept the temperature under the conditions of 1450-1600 DEG C to burn till..
Using the porous mullite ceramics prepared by the method for the present embodiment：Main object is mutually mullite, and air hole structure is
Penetrate through shape, apparent porosity be 50~55%, average pore size be 70~80 μm, bulk density be 1.73~1.82g/cm3, mullite
Directly in conjunction with the porous mullite ceramics that cold crushing strength is 55~65Mpa.
Present embodiment 1~4 decomposes in situ generate using raw material itself and penetrates through shape stomata, avoids because adding pore-creating
Dosage form is into CO2Secondary pollution is caused, is conducive to environmental protection；Raw material reaction in-situ generation mullite after decomposition, forms not
Come stone directly in conjunction with porous mullite ceramics, there is more preferably high-temperature behavior.Meanwhile also with apparent porosity, air vent aperture
The advantages of controllable.
Therefore, present embodiment has the characteristics that environmental-friendly, pore size and volume content are controllable, prepared
Porous mullite ceramics strength is high, good permeability and high-temperature behavior are good.
Finally it should be noted that：The above embodiments are merely illustrative of the technical scheme of the present invention and are not intended to be limiting thereof, to the greatest extent
Pipe is described in detail the present invention with reference to above-described embodiment, and those of ordinary skill in the art still can be to this hair
Bright specific embodiment is modified or replaced equivalently, these without departing from the spirit and scope of the present invention any modification or
Person's equivalent substitution is being applied within pending claims.
Claims (4)
1. a kind of preparation method of porous mullite ceramics, which is characterized in that the porous mullite ceramics by activated alumina,
Silicon powder, sillimanite, flyash, zirlite and water reaction generation, with the activated alumina, the silicon powder, the silicon
On the basis of line stone, the flyash, the zirlite and the water gross mass, by the active oxidation of 15-30 mass %
Aluminium, the silicon powder of 15-25 mass %, the sillimanite of 10-15 mass %, 12-20 mass % the flyash and
The water mixing of the zirlite, 12-20 mass % of 10~18 mass %, is then pressed into type, then will be after shaping
Green body is when drying 24~36 is small under the conditions of 220 DEG C, then green body is kept the temperature 3-6h under the conditions of 1400-1600 DEG C and is burnt till.
2. the preparation method of porous mullite ceramics according to claim 1, which is characterized in that the bastard coal mountain flour, Al
(OH) grain size of 3 powder, talcum powder, magnesite powder and Cab-O-sil is respectively less than 58 μm.
3. the preparation method of porous mullite ceramics according to claim 1, which is characterized in that the side of the compression moulding
Formula is manual ramming.
4. a kind of porous mullite ceramics, which is characterized in that the porous mullite ceramics are according to claims 1 to 3 Xiang Zhongren
Prepared by the method for anticipating.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108751968A (en) * | 2018-06-13 | 2018-11-06 | 北京科技大学 | A kind of porous ceramic film material preparation method of intrinsic pore-forming |
| CN113754458A (en) * | 2021-07-08 | 2021-12-07 | 北方民族大学 | SiO (silicon dioxide)2Resin ash doped porous ceramic and preparation method thereof |
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| RU2257261C1 (en) * | 2004-05-17 | 2005-07-27 | Институт Катализа Имени Г.К. Борескова Сибирского Отделения Российской Академии Наук | Catalyst carrier and a method for preparation thereof |
| CN102557717A (en) * | 2012-03-20 | 2012-07-11 | 武汉科技大学 | Porous cordierite-mullite composite ceramic material and preparation method thereof |
| CN103833400A (en) * | 2012-11-27 | 2014-06-04 | 东北大学 | Preparation method of self-reinforced mullite porous ceramic |
| CN107010968A (en) * | 2017-04-19 | 2017-08-04 | 郑州大学 | A kind of high-strength light-weight corundum porzite flame-proof aggregate and preparation method thereof |
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2017
- 2017-12-06 CN CN201711271113.5A patent/CN108083789A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| RU2257261C1 (en) * | 2004-05-17 | 2005-07-27 | Институт Катализа Имени Г.К. Борескова Сибирского Отделения Российской Академии Наук | Catalyst carrier and a method for preparation thereof |
| CN102557717A (en) * | 2012-03-20 | 2012-07-11 | 武汉科技大学 | Porous cordierite-mullite composite ceramic material and preparation method thereof |
| CN103833400A (en) * | 2012-11-27 | 2014-06-04 | 东北大学 | Preparation method of self-reinforced mullite porous ceramic |
| CN107010968A (en) * | 2017-04-19 | 2017-08-04 | 郑州大学 | A kind of high-strength light-weight corundum porzite flame-proof aggregate and preparation method thereof |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108751968A (en) * | 2018-06-13 | 2018-11-06 | 北京科技大学 | A kind of porous ceramic film material preparation method of intrinsic pore-forming |
| CN113754458A (en) * | 2021-07-08 | 2021-12-07 | 北方民族大学 | SiO (silicon dioxide)2Resin ash doped porous ceramic and preparation method thereof |
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