CN1253413C - Method for preparing porous ceramic by polycrystalline Al#-[2]O#-[3] fiber preforming method - Google Patents
Method for preparing porous ceramic by polycrystalline Al#-[2]O#-[3] fiber preforming method Download PDFInfo
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- CN1253413C CN1253413C CN 200310114507 CN200310114507A CN1253413C CN 1253413 C CN1253413 C CN 1253413C CN 200310114507 CN200310114507 CN 200310114507 CN 200310114507 A CN200310114507 A CN 200310114507A CN 1253413 C CN1253413 C CN 1253413C
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Abstract
The present invention provides a method for preparing porous ceramics by a polycrystalline Al2O3 fiber preforming method, which comprises the processes of raw material preparation, blank body formation and calcination. The present invention is characterized in that: (1) according to the mass percentage, 70 to 80% of alumina powder, 10 to 15% of clay soil, 4 to 9% of high temperature anchoring agent and 1 to 2 % of slurry additive are mixed with water for ball milling to be prepared into slurry; then, the slurry, dispergator and pore forming agents are mixed to be prepared into filling slurry; (2) polycrystalline Al2O3 ceramic fibers are cut into short sections, and is stirred and dispersed in water, and then adhesive is added to be prepared into fiber paste; (3) the fiber paste is injected into moulds to be prepared into preformed bodies, and the preformed bodies are dried; (4) the dried preformed bodies are put into plaster moulds, and the filling slurry is injected for vacuum pumping together; (5) the preformed bodies of the filling slurry are dried and calcined at a high temperature. The prepared product has the advantages of high intensity, strong thermal shock resistance, simple production technique and high rate of finished products; and the present invention is especially suitable for the industrial production of ceramic filtering elements used by high temperature coal (smoke) filtering devices.
Description
Affiliated technical field
The present invention relates to a kind of polymorph A l
2O
3The method of the standby porous ceramics of perform manufacturing legal system belongs to porous ceramics fabricating technology field.
Background technology
The technology of preparing of traditional alumina porous ceramic filtering element, be on ceramic matrix, to produce the hole, and often improve the voidage of element with the firing temperature that reduces base substrate, performances such as the voidage of alumina porous ceramic and intensity are conflicting all the time, often attend to one thing and lose sight of another on producing and using, particularly the goods of traditional production technique are difficult to satisfy the alumina porous ceramic filtering element at the filtering performance requriements of high-temperature flue gas.
Summary of the invention
Problem to be solved by this invention provides a kind of with polycrystalline alumina ceramic fiber and alumina-based ceramic composite methods, prepare high-strength, high thermal stability, the ratio of performance to price reasonable, be suitable for the filtering porous ceramics production technology of high-temperature flue gas.Its technical scheme is:
Comprise raw material preparation, blank forming and burn till, it is characterized in that: (1) with alumina powder jointed, clay, aluminium titanates, mud additive by mass percentage 70～80,10～15,4～19,1～2 ratio mix with water after ball milling be prepared into mud, mud with preparation is mixed with into filling mud with degumming agent, pore creating material at mixer again, component and the proportioning of filling mud are degumming agent 1wt%, pore creating material 4～11wt%, and surplus is mud; (2) with polymorph A l
2O
3Ceramic fibre is chopped, dispersed with stirring in water, and the adding binding agent is made polymorph A l
2O
3The ceramic fibre slurry, polymorph A l in the slurry
2O
3The mass percent of ceramic fibre, binding agent, water is 31～47,2～5,58～67; (3) with polymorph A l
2O
3The ceramic fibre slurry injects mould and makes preform, and dry; (4) preform that drying is good is put into plaster mold, injects the filling mud for preparing, and vacuumizes together; (5) filled mud the preform drying, burn till.
For achieving the above object, described polymorph A l
2O
3The method of the standby porous ceramics of perform manufacturing legal system, alumina powder jointed employing Al
2O
3The commercial alumina powder of content 99%, fineness 75 μ m; Each composition and quality proportioning are Datong District's soil in the clay: Jiexiu soil equals 5～8: 4～6; Mud additive adopts sodium carbonate, and degumming agent adopts citric acid.
For achieving the above object, described polymorph A l
2O
3The method of the standby porous ceramics of perform manufacturing legal system, polymorph A l
2O
3The Al of ceramic fibre
2O
3Content＞72%, Al
2O
3+ SiO
2〉=97.5%, refractoriness 〉=1600 ℃, diameter 4～5 μ m, length 1～60mm.
For achieving the above object, described polymorph A l
2O
3The method of the standby porous ceramics of perform manufacturing legal system, each composition is waterglass 2～5wt% in the binding agent, POLYPROPYLENE GLYCOL 1～3wt%, water 92～97wt%, each composition is charcoal powder 22～45wt% in the pore creating material, cellulose 55～78wt%.
The preform mass percent after drying of making according to this method consists of: chopped polymorph A l
2O
3Fiberoptic fiber 26～37wt%, pore creating material 4～11wt%, dry mud 52～70wt%.
The present invention compared with prior art, the product strength height that makes, thermal shock resistance is strong, production technique is simple, the yield rate height, suitable especially high temperature coal (cigarette) air filter is with the suitability for industrialized production of ceramic filter element.
Embodiment
Embodiment 1
1. slurry preparation:
Commercial alumina powder (75 μ m) 76wt%, Jiexiu soil 7wt%, the soil 6wt% of Datong District, aluminium titanates 10wt%, yellow soda ash 1wt%;
Above-mentioned raw materials is mixed with water, ground 72 hours in ball mill, be prepared into mud, moil fineness goes out to grind stand-by at 15 μ m then.
2. preform preparation technology: length is at the polymorph A l of 1～60mm
2O
3Ceramic fibre adds binding agent and water, the polymorph A l that preparation is mobile
2O
3The ceramic fibre slurry, its mass percent: polymorph A l
2O
3Ceramic fibre 32wt%, binding agent 5wt%, water 63wt% copies with big punch die and to get moulding, obtains polymorph A l through air dry or baking oven electrothermal drying
2O
3The ceramic fibre preform.
3. blank forming technology: adopt the suction filtration forming technique, with mud, pore-forming material, citric acid 94wt%: 5wt% by mass percentage: 1wt% mixing stirring, vacuumize, in the preform in the injection model, keep certain surplus slurry, suction filtration moulding under high vacuum condition places base substrate in drying baker or the drying kiln again, dries base substrate under 60～100 ℃ of temperature, the condition of 3～6 hours time.
4. firing process: the base substrate after the oven dry burns till under 1300～1460 ℃, 1～2 hour condition, makes polymorph A l of the present invention
2O
3Ceramic fibre strengthens the alumina porous ceramic filter element.
Through check, the technical indicator of the product that makes is: average intensity 36MPa, average void content 40%, aperture are 5 μ m.
Embodiment 2:
Commercial alumina powder (75 μ m) 75wt%, Jiexiu soil 7wt%, the soil 8wt% of Datong District, aluminium titanates 9wt%, yellow soda ash 1wt%;
Embodiment 3:
Commercial alumina powder (75 μ m) 78wt%, Jiexiu soil 6wt%, the soil 5wt% of Datong District, aluminium titanates 10wt%, yellow soda ash 1wt%;
The preparation technology of embodiment 2,3 is substantially with embodiment 1, and the technical indicator of the product that makes is: average intensity 36MPa, average void content 40%, aperture are respectively 3,1 μ m.
Claims (5)
1, a kind of polymorph A l
2O
3The method of the standby porous ceramics of perform manufacturing legal system, comprise raw material preparation, blank forming and burn till, it is characterized in that: (1) with alumina powder jointed, clay, aluminium titanates, mud additive by mass percentage 70～80,10～15,4～19,1～2 ratio mix with water after ball milling be prepared into mud, mud with preparation is mixed with into filling mud with degumming agent, pore creating material at mixer again, component and the proportioning of filling mud are degumming agent 1wt%, pore creating material 4～11wt%, and surplus is mud; (2) with polymorph A l
2O
3Ceramic fibre is chopped, dispersed with stirring in water, and the adding binding agent is made polymorph A l
2O
3The ceramic fibre slurry, polymorph A l in the slurry
2O
3The mass percent of ceramic fibre, binding agent, water is 31～47,2～5,58～67; (3) with polymorph A l
2O
3The ceramic fibre slurry injects mould and makes preform, and dry; (4) preform that drying is good is put into plaster mold, injects the filling mud for preparing, and vacuumizes together; (5) filled mud the preform drying, burn till.
2, polymorph A l as claimed in claim 1
2O
3The method of the standby porous ceramics of perform manufacturing legal system is characterized in that: alumina powder jointed employing Al
2O
3The commercial alumina powder of content 99%, fineness 75 μ m; Each composition and quality proportioning are Datong District's soil in the clay: Jiexiu soil equals 5～8: 4～6; Mud additive adopts sodium carbonate, and degumming agent adopts citric acid.
3, polymorph A l as described in claim 1
2O
3The method of the standby porous ceramics of perform manufacturing legal system is characterized in that: polymorph A l
2O
3The Al of ceramic fibre
2O
3Content＞72%, Al
2O
3+ SiO
2〉=97.5%, refractoriness 〉=1600 ℃, diameter 4～5 μ m, length 1～60mm.
4, polymorph A l as described in claim 1
2O
3The method of the standby porous ceramics of perform manufacturing legal system, it is characterized in that: each composition is waterglass 2～5wt% in the binding agent, POLYPROPYLENE GLYCOL 1～3wt%, water 92～97wt%.
5, polymorph A l as described in claim 1
2O
3The method of the standby porous ceramics of perform manufacturing legal system, it is characterized in that: each composition is charcoal powder 22～45wt% in the pore creating material, cellulose 55～78wt%.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200310114507 CN1253413C (en) | 2003-12-18 | 2003-12-18 | Method for preparing porous ceramic by polycrystalline Al#-[2]O#-[3] fiber preforming method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200310114507 CN1253413C (en) | 2003-12-18 | 2003-12-18 | Method for preparing porous ceramic by polycrystalline Al#-[2]O#-[3] fiber preforming method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1629101A CN1629101A (en) | 2005-06-22 |
| CN1253413C true CN1253413C (en) | 2006-04-26 |
Family
ID=34843439
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200310114507 Expired - Fee Related CN1253413C (en) | 2003-12-18 | 2003-12-18 | Method for preparing porous ceramic by polycrystalline Al#-[2]O#-[3] fiber preforming method |
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Families Citing this family (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102006045816A1 (en) * | 2006-09-28 | 2008-04-03 | Clariant International Limited | Polycrystalline corundum fibers and process for their preparation |
| CN100409922C (en) * | 2007-02-07 | 2008-08-13 | 山东理工大学 | Desulphurizing and dust-removing integral gradient porous ceramic filter element preparing technology |
| CN101530701B (en) * | 2008-03-10 | 2011-04-13 | 山东理工大学 | Preparation method for silicon carbide candled filter |
| CN101591175B (en) * | 2008-05-30 | 2011-12-28 | 山东理工大学 | Preparation method for oxide porous ceramic |
| CN101955372B (en) * | 2010-04-20 | 2013-01-02 | 南京理工大学 | Mullite fiber reinforced porous ceramic product and method for preparing mullite fiber reinforced porous ceramic product from waste ceramics |
| CN102746022B (en) * | 2011-12-29 | 2013-12-04 | 西安建筑科技大学 | Preparation method for Al2O3 ceramic material having controllable bimodal porous structure |
| CN110981519A (en) * | 2019-12-20 | 2020-04-10 | 南通恩普热能技术有限公司 | Polycrystalline fiber heat preservation module |
| CN113134893A (en) * | 2020-01-20 | 2021-07-20 | 西部宝德科技股份有限公司 | Preparation method of ceramic fiber filter tube for high-temperature flue gas purification |
| CN114262179B (en) * | 2021-12-17 | 2022-12-13 | 清华大学 | Mullite fiber reinforced geopolymer composite material and preparation method and application thereof |
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2003
- 2003-12-18 CN CN 200310114507 patent/CN1253413C/en not_active Expired - Fee Related
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| CN1629101A (en) | 2005-06-22 |
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