CN101475400A - Floamed ceramic reinforcing fiber porous ceramic - Google Patents
Floamed ceramic reinforcing fiber porous ceramic Download PDFInfo
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- CN101475400A CN101475400A CNA2008100256101A CN200810025610A CN101475400A CN 101475400 A CN101475400 A CN 101475400A CN A2008100256101 A CNA2008100256101 A CN A2008100256101A CN 200810025610 A CN200810025610 A CN 200810025610A CN 101475400 A CN101475400 A CN 101475400A
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Abstract
The invention relates to novel foamed ceramics reinforced fiber porous ceramics. Chopped fibers are uniformly filled into holes which are communicated with each other through foamed ceramics by changing the production technology and adopting a stirring-suction filtration method, and the foamed ceramics/fiber composite porous ceramics with high strength, high porosity and three-dimensional continuous holes are prepared, wherein the foamed ceramics are taken as a framework of the composite porous ceramics, have reinforcing and supporting functions, and solve the problem of the strength of the fiber porous ceramics; and fibers are mutually assembled to form small holes which are then taken as a filtration medium. The invention simultaneously discloses a method and a device for preparing the foamed ceramics/fiber composite porous ceramics. The invention has the obvious advantages of high product strength, good porosity and air permeability, uniform filling, simple technique and equipment of a forming method, convenient operation, easy demolding, long service life of production equipment, etc.
Description
Affiliated technical field
The present invention relates to porous fiber ceramic, especially to foamed ceramics porous fiber ceramic weave construction and preparation technology's improvement.
Background technology
In recent years, along with the continuous development of clean coal technology and high temperature gas cleaning technology, countries in the world are more and more high to the performance requriements of high-temperature-resistant filtering material.Traditional screening and dedusting method is owing to be subjected to the resistant to elevated temperatures restriction of filtering material, and its application is subjected to great restriction.Advantages such as the porous material by the ceramic fiber preparation also claims porous fiber ceramic owing to have high temperature high voltage resistant, resist chemical, Heat stability is good, particle removal efficiency height, and fluid resistance is little are used for the high temperature gas cleaning aspect and have not replaceable advantage.Porous fiber ceramic is because its three-dimensional hole continuously simultaneously, has high specific surface area, advantages such as small aperture and fiber self characteristics, as the auto-exhaust catalyst carrier, the molten metal secondary filter, composite preform, also there is important use aspects such as heat-storing material porous matrix.
Porous fiber ceramic mainly is textile property or a very thin form of utilizing fiber, is configured to a kind of porous material of three-dimensional hole mutually.The method of its moulding comprises fibrage, winding, vacuum filtration method, pressurization fluid-discharge therapy etc.Also there is following defective in these forming methods and products thereof:
(1) fibrage, winding method need adopt continuous fibre, the Processes and apparatus complexity.The continuous fibre major part also just is in conceptual phase at present, also do not become real feasible forming method, and reasonable product cost sophisticated, that spinning property is good is very high, and price is very expensive.
(2) though to have technology simple for vacuum filtration method or pressurization fluid-discharge therapy, need not continuous fibre, the characteristics that cost is low; But its product physical strength is low, makes the application of porous fiber ceramic be restricted.
Summary of the invention
The purpose of patent of the present invention is: by designing the product weave construction of new moulding process, preparation technology and Xin, design new foamed ceramics/fiber composite porous ceramics preparation facilities, overcome the low shortcoming of porous fiber ceramic physical strength, it is widely used; Simultaneously, make product have three-dimensional successive pore space structure, staple fibre is filled evenly, product strength height, void content height, and pore is even.
The present invention is achieved in that
A kind of floamed ceramic reinforcing fiber porous ceramic, staple fibre evenly is filled in the hole of foamed ceramics connection, prepared foamed ceramics/fiber composite porous ceramics has high strength, high porosity, have three-dimensional successive pore space structure, wherein foamed ceramics plays enhancing and supporting role as the skeleton of composite porous ceramic, solved the strength problem of porous fiber ceramic, fiber is configured to said minuscule hole mutually as filtration medium; Its forming method adopts stirring-suction method, in mould, add rare finely disseminated ceramic slurry, the speed that spills that high-speed stirring is controlled water simultaneously makes fiber can evenly be filled in all communicating apertures of foamed ceramics, avoids fiber to stop up hole and can't fill whole holes at the foamed ceramics surface sediment; Add caking agent again after moulding is intact, adopt the vacuum filtration method to make unnecessary water and caking agent discharge; Fiber need be cut short to 2-4mm, will add dispersion agent and a large amount of water simultaneously, is made into extremely rare slip; This me fibrous slurry helps the inner hole of even filled and process pottery; Stirring velocity will reach 600r/min at least, for making evenly all communicating apertures of filled and process pottery of fiber, need control the eliminating speed of water in high-speed stirring, and speed is high more, helps the even filling of fiber more; Contour machining equipment has stirrer, forming mould, sealing member, waste liquid pool, filter flask, vacuum pump etc., after moulding is finished on the technology, add caking agent again, connect forming mould, filter flask and vacuum pump, start unnecessary water of vacuum pump suction filtration and caking agent then; Foam ceramic material can be an aluminum oxide, can be silicon carbide, also can be aluminium titanates.
The present invention has designed the method and apparatus that is used to prepare foamed ceramics/fiber composite porous ceramics simultaneously.
Concrete technological line of the present invention and technical process are:
(1) the good needed fiber of weighing cuts short fiber to 2-4mm, adds entry, and dispersion agent applies stirring, forms the homogeneous fibre slip.
(2) have pore in the bottom, be lined with the foamed ceramics of packing in the mould of screen cloth.
(3) topped up with water in mould is carried out high-speed stirring to water, adds the small amount of fibers slip simultaneously.
(4) water is constantly discharged from screen cloth, need constantly add me fibrous slurry, and the speed that the water of controlling well is discharged all joins in the mould until me fibrous slurry.Fiber is in high-speed stirring and the downward exclusion process of liquid, and constantly the hole of the connection of filled and process pottery inside forms foamed ceramics/fiber compound structure, and is unlikely to stop up at surface sediment.
(5) treat that liquid all got rid of, stop to stir that add inorganic adhesive, vacuum filtration is got rid of unnecessary water and caking agent.
(6) demoulding, drying is burnt till.
Above-mentioned foamed ceramics has the porous ceramics of connected holes for being presoma production with the organic foam plastic.
Fiber in the ceramic fiber slip need carry out shearing treatment, will add dispersion agent and a large amount of water simultaneously, is made into extremely rare slip.This me fibrous slurry helps the inner hole of even filled and process pottery.
Above-mentioned high-speed stirring speed will reach 600r/min at least, need control the eliminating speed of water in the time of high-speed stirring, its objective is to make evenly all communicating apertures of filled and process pottery of fiber, avoids fiber to stop up hole at the foamed ceramics surface sediment.Speed is high more, helps the even filling of fiber more.
The required molding device of above-mentioned moulding process comprises forming mould, stirrer, waste liquid pool, filter flask, vacuum pump etc.; Wherein forming mould comprises funnel, porous plate, screen cloth, sealing member.For the ease of the demoulding, adopt the active porous plate, only need oppositely release from the funnel bottom with glass stick and get final product this moment.Also can adopt Sha Shi funnel, screen cloth, sealing member etc., need utilize the pressurized air blowback demoulding this moment.
The size of funnel and specification are determined according to the product of moulding, prepare the square product as needs, need to add the square foamed ceramics, the big slightly funnel that needs size to compare simultaneously, and fill with sponge the gap.
Have three-dimensional successive pore space structure by adopting above-mentioned preparation equipment and preparation technology, just can producing, staple fibre is filled evenly, product strength height, void content height, and pore is even, and its widely used floamed ceramic reinforcing fiber porous ceramic.The foamed ceramics of high porosity plays enhancing and supporting role as the skeleton of composite porous ceramic, has solved the strength problem of porous fiber ceramic.Fiber is configured to said minuscule hole mutually then as filtration medium.The product of explained hereafter of the present invention can be used for high-temperature flue gas strainer, auto-exhaust catalyst carrier etc., in addition, can also be used for molten metal secondary filter, matrix material porous preform, heat-storing material porous ceramic matrices suitable etc.
Advantage of the present invention is: (1) utilizes the preparation of stirring-suction method, foamed ceramics/fiber composite porous ceramics product strength height, and the void content height, good permeability, pore is even.(2) adopt and to add water earlier and be made into the solvent or diluent slurry, add the method for caking agent after the moulding again, saved the consumption of caking agent, reduced the consume of caking agent and the corrosive nature of equipment.(3) forming method has technology and apparatus and process is simple, and easy to operate, cost is low, is easy to the advantage of the demoulding.(4) end-use of explained hereafter of the present invention is extensive.
Description of drawings
Below provide embodiment, patent of the present invention is further described.
Fig. 1 is foamed ceramics of the present invention/fiber composite porous ceramics section microscopic appearance (250 *) structure iron.
Fig. 2 is junction (250 *) structure iron of fiber of the present invention and foamed ceramics skeleton.
Fig. 3 is a shaped device synoptic diagram of the present invention.1 is stirrer among the figure, and 2 is funnel, and 3 is screen cloth, and 4 is porous plate, and 5 is waste liquid pool, and 6 is sebific duct, and 7 is filter flask, and 8 is vacuum pump, and 9 is electric motor.
Embodiment
Embodiment 1 (Fig. 1, Fig. 2, Fig. 3)
Take by weighing the 6g fiber, cut short, add the 1g polyacrylamide, be made into the 2000ml slip, stirred 20 minutes to 2-4mm.In forming mould, pack into the aluminum oxide foam pottery of Φ 45mm.Full water again, applying high-speed stirring speed is 700r/min, slowly pours the slip that stirs again into.Along with water is got rid of from screen cloth, need constantly add me fibrous slurry, control the eliminating speed of water well.Speed is fast, and fiber is not easy fully is filled in the three-dimensional hole of foamed ceramics and goes, speed too slowly then the time cycle long.Be generally 40-80ml/min.All add up to all me fibrous slurry.Stop to stir, add the aluminium dihydrogen phosphate caking agent of 20ml10%, on funnel point mouth, connect sebific duct again, opened the vacuum pump suction filtration 3 minutes, get rid of unnecessary water and caking agent.Oppositely release sample with glass stick from the funnel bottom afterwards.Take out sample, drying is burnt till at 1000 ℃.Resulting product ultimate compression strength 6MPa, void content are 84%.And the ultimate compression strength of independent foamed ceramics and porous fiber ceramic is respectively 3MPa and 0.6MPa.The sample that fractures is observed inner section, fiber filled the inner all holes of foamed ceramics, fill evenly no macropore existence.Scanning electron microscopic observation is found the even framework of fiber, and caking agent is evenly distributed on fiber-fiber and fiber-foamed ceramics junction, no plug-hole phenomenon; Fiber is connected well with foamed ceramics, helps strengthening whole mechanical property.Adopt the porous fiber ceramic of above-mentioned technology, the intensity height, the void content height, good permeability, pore is even, and technology and apparatus and process are simple, and corrosion is few, and easy to operate, cost is low, is easy to the demoulding, broad-spectrum advantage.
Embodiment 2 (Fig. 1, Fig. 2, Fig. 3)
Processing condition just adopt foam silicon carbide ceramics as strengthening body with embodiment 1.Gained sample ultimate compression strength is 10MPa, and void content is 82%.Sample section is observed and is found that fiber filled is even, and no macropore exists.Scanning electron microscopic observation finds that fiber is even, and caking agent is evenly distributed on fiber-fiber and fiber-foamed ceramics junction, no plug-hole phenomenon; Fiber is connected well with foamed ceramics, helps strengthening whole mechanical property.
Embodiment 3 (Fig. 1, Fig. 2, Fig. 3)
Processing condition just add the 20ml10% silicon sol as caking agent with embodiment 1.Gained sample ultimate compression strength is 5.2PMa, and void content is 80%.Sample section is observed and is found that fiber filled is even, and no macropore exists.Scanning electron microscopic observation is found the even framework of fiber, and caking agent connects fiber-fiber and fiber-foamed ceramics junction, and a small amount of unnecessary caking agent conglomeration is arranged, and slight plug-hole phenomenon is arranged; Fiber is connected well with foamed ceramics.
Embodiment 4 (Fig. 1, Fig. 2, Fig. 3)
Processing condition are with embodiment 1, and just sintering temperature is 1250 ℃.Gained sample ultimate compression strength is 6.8PMa, and void content is 83%.Observe inner section, fiber filled the inner all holes of foamed ceramics, fill evenly no macropore existence.Scanning electron microscopic observation is found the even framework of fiber, and caking agent is evenly distributed on fiber-fiber and fiber-foamed ceramics junction, no plug-hole phenomenon; Fiber is connected well with foamed ceramics.
Claims (5)
1. floamed ceramic reinforcing fiber porous ceramic, it is characterized in that: staple fibre evenly is filled in the hole of foamed ceramics connection, prepared foamed ceramics/fiber composite porous ceramics has high strength, high porosity, have three-dimensional successive pore space structure, wherein foamed ceramics plays enhancing and supporting role as the skeleton of composite porous ceramic, solved the strength problem of porous fiber ceramic, fiber is configured to said minuscule hole mutually as filtration medium; Its forming method adopts stirring-suction method, in mould, add rare finely disseminated ceramic slurry, the speed that spills that high-speed stirring is controlled water simultaneously makes fiber can evenly be filled in all communicating apertures of foamed ceramics, avoids fiber to stop up hole and can't fill whole holes at the foamed ceramics surface sediment; Add caking agent again after moulding is intact, adopt the vacuum filtration method to make unnecessary water and caking agent discharge.
2. floamed ceramic reinforcing fiber porous ceramic according to claim 1 is characterized in that: fiber need be cut short to 2-4mm, will add dispersion agent and a large amount of water simultaneously, is made into extremely rare slip; This me fibrous slurry helps the inner hole of even filled and process pottery.
3. floamed ceramic reinforcing fiber porous ceramic according to claim 1, it is characterized in that: stirring velocity will reach 600r/min at least, for making evenly all communicating apertures of filled and process pottery of fiber, need in high-speed stirring, control the eliminating speed of water, speed is high more, helps the even filling of fiber more.
4. floamed ceramic reinforcing fiber porous ceramic according to claim 1 is characterized in that: contour machining equipment has stirrer, forming mould, sealing member, waste liquid pool, filter flask, vacuum pump etc.; After moulding is finished on the technology, add caking agent again, connect forming mould, filter flask and vacuum pump, start unnecessary water of vacuum pump suction filtration and caking agent then.
5. floamed ceramic reinforcing fiber porous ceramic according to claim 1 is characterized in that: foam ceramic material can be an aluminum oxide, can be silicon carbide, also can be aluminium titanates.
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Cited By (14)
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| CN101913835A (en) * | 2010-08-06 | 2010-12-15 | 华南理工大学 | Foamed ceramic reinforcing fiber aerogel insulating material and preparation method thereof |
| CN101955368A (en) * | 2010-04-20 | 2011-01-26 | 无锡南理工科技发展有限公司 | Alumina fiber-reinforced porous ceramic product and method for manufacturing product by using silt |
| CN101955367A (en) * | 2010-04-20 | 2011-01-26 | 无锡南理工科技发展有限公司 | Durable ultra-light fiber reinforced ceramic material and preparation method thereof |
| CN102040392A (en) * | 2010-04-20 | 2011-05-04 | 无锡南理工科技发展有限公司 | Hybrid fiber reinforced light ceramic material and preparation method thereof |
| CN102050636A (en) * | 2010-04-20 | 2011-05-11 | 无锡南理工科技发展有限公司 | Basalt fiber reinforced porous ceramic product and method for preparing same by using coal ore |
| CN103322808A (en) * | 2013-06-17 | 2013-09-25 | 大连理工高邮研究院有限公司 | Method and device for continuously preparing thermal cylinder by using vacuum filtration metho |
| CN104311095A (en) * | 2014-09-25 | 2015-01-28 | 山东理工大学 | Method for preparing porous ceramic from active alumina precursor |
| CN104387113A (en) * | 2014-11-17 | 2015-03-04 | 苏州博清高新材料有限公司 | Fiber-reinforced ceramic filter element and preparation method thereof |
| CN104692829A (en) * | 2015-02-13 | 2015-06-10 | 上海应用技术学院 | Foam ceramic insulation material and preparation method thereof |
| CN106588022A (en) * | 2016-12-18 | 2017-04-26 | 吴德炳 | Process for preparing silicon carbide foam ceramic by using template method |
| CN109421160A (en) * | 2017-08-21 | 2019-03-05 | 北新集团建材股份有限公司 | A kind of dalle preparation facilities |
| CN109718603A (en) * | 2019-01-16 | 2019-05-07 | 苏州宏久航空防热材料科技有限公司 | A kind of lamination combined filtration structure |
| CN110078516A (en) * | 2019-05-14 | 2019-08-02 | 西北工业大学 | The quasi-isotropic SiC of high-volume fractional short fiber reinforcedfThe preparation method of/SiC ceramic matrix composite material |
| CN111039693A (en) * | 2019-12-31 | 2020-04-21 | 郑州登电科诚新材料有限公司 | Production process of ceramic fiber paper recycled foamed ceramic insulation board |
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2008
- 2008-01-04 CN CN 200810025610 patent/CN101475400B/en active Active
Cited By (18)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101955368A (en) * | 2010-04-20 | 2011-01-26 | 无锡南理工科技发展有限公司 | Alumina fiber-reinforced porous ceramic product and method for manufacturing product by using silt |
| CN101955367A (en) * | 2010-04-20 | 2011-01-26 | 无锡南理工科技发展有限公司 | Durable ultra-light fiber reinforced ceramic material and preparation method thereof |
| CN102040392A (en) * | 2010-04-20 | 2011-05-04 | 无锡南理工科技发展有限公司 | Hybrid fiber reinforced light ceramic material and preparation method thereof |
| CN102050636A (en) * | 2010-04-20 | 2011-05-11 | 无锡南理工科技发展有限公司 | Basalt fiber reinforced porous ceramic product and method for preparing same by using coal ore |
| CN101913835B (en) * | 2010-08-06 | 2012-12-26 | 华南理工大学 | Foamed ceramic reinforcing fiber aerogel insulating material and preparation method thereof |
| CN101913835A (en) * | 2010-08-06 | 2010-12-15 | 华南理工大学 | Foamed ceramic reinforcing fiber aerogel insulating material and preparation method thereof |
| CN103322808A (en) * | 2013-06-17 | 2013-09-25 | 大连理工高邮研究院有限公司 | Method and device for continuously preparing thermal cylinder by using vacuum filtration metho |
| CN104311095B (en) * | 2014-09-25 | 2017-09-22 | 山东理工大学 | The method that porous ceramics is prepared with activated alumina presoma |
| CN104311095A (en) * | 2014-09-25 | 2015-01-28 | 山东理工大学 | Method for preparing porous ceramic from active alumina precursor |
| CN104387113A (en) * | 2014-11-17 | 2015-03-04 | 苏州博清高新材料有限公司 | Fiber-reinforced ceramic filter element and preparation method thereof |
| CN104692829A (en) * | 2015-02-13 | 2015-06-10 | 上海应用技术学院 | Foam ceramic insulation material and preparation method thereof |
| CN106588022A (en) * | 2016-12-18 | 2017-04-26 | 吴德炳 | Process for preparing silicon carbide foam ceramic by using template method |
| CN106588022B (en) * | 2016-12-18 | 2019-06-07 | 青岛中冶坩埚有限公司 | A kind of technique preparing foam silicon carbide ceramics using template |
| CN109421160A (en) * | 2017-08-21 | 2019-03-05 | 北新集团建材股份有限公司 | A kind of dalle preparation facilities |
| CN109718603A (en) * | 2019-01-16 | 2019-05-07 | 苏州宏久航空防热材料科技有限公司 | A kind of lamination combined filtration structure |
| CN109718603B (en) * | 2019-01-16 | 2021-04-02 | 苏州宏久航空防热材料科技有限公司 | Laminated composite filtering structure |
| CN110078516A (en) * | 2019-05-14 | 2019-08-02 | 西北工业大学 | The quasi-isotropic SiC of high-volume fractional short fiber reinforcedfThe preparation method of/SiC ceramic matrix composite material |
| CN111039693A (en) * | 2019-12-31 | 2020-04-21 | 郑州登电科诚新材料有限公司 | Production process of ceramic fiber paper recycled foamed ceramic insulation board |
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