CN115010512B - Foam ceramic filter and preparation method thereof - Google Patents
Foam ceramic filter and preparation method thereof Download PDFInfo
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- CN115010512B CN115010512B CN202210635365.6A CN202210635365A CN115010512B CN 115010512 B CN115010512 B CN 115010512B CN 202210635365 A CN202210635365 A CN 202210635365A CN 115010512 B CN115010512 B CN 115010512B
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- 239000006260 foam Substances 0.000 title claims abstract description 223
- 239000000919 ceramic Substances 0.000 title claims abstract description 146
- 238000002360 preparation method Methods 0.000 title claims abstract description 37
- 239000002002 slurry Substances 0.000 claims abstract description 53
- 239000011248 coating agent Substances 0.000 claims abstract description 40
- 238000000576 coating method Methods 0.000 claims abstract description 40
- 239000011247 coating layer Substances 0.000 claims abstract description 39
- 238000000034 method Methods 0.000 claims abstract description 32
- 239000000463 material Substances 0.000 claims abstract description 25
- 238000004519 manufacturing process Methods 0.000 claims abstract description 22
- 238000001035 drying Methods 0.000 claims abstract description 18
- 238000005245 sintering Methods 0.000 claims abstract description 14
- 239000004744 fabric Substances 0.000 claims description 31
- 238000007789 sealing Methods 0.000 claims description 22
- 239000003292 glue Substances 0.000 claims description 19
- -1 Polyethylene Polymers 0.000 claims description 12
- 239000004698 Polyethylene Substances 0.000 claims description 12
- 229920006267 polyester film Polymers 0.000 claims description 12
- 229920000573 polyethylene Polymers 0.000 claims description 12
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- 210000002268 wool Anatomy 0.000 claims description 3
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- 239000002893 slag Substances 0.000 abstract description 19
- 230000008569 process Effects 0.000 abstract description 15
- 235000015895 biscuits Nutrition 0.000 description 31
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 16
- 239000000047 product Substances 0.000 description 15
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 11
- 239000000203 mixture Substances 0.000 description 11
- MCMNRKCIXSYSNV-UHFFFAOYSA-N Zirconium dioxide Chemical compound O=[Zr]=O MCMNRKCIXSYSNV-UHFFFAOYSA-N 0.000 description 10
- 239000011230 binding agent Substances 0.000 description 10
- 239000004576 sand Substances 0.000 description 10
- CPLXHLVBOLITMK-UHFFFAOYSA-N Magnesium oxide Chemical compound [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 description 8
- 229920005830 Polyurethane Foam Polymers 0.000 description 8
- 238000000498 ball milling Methods 0.000 description 8
- 230000000052 comparative effect Effects 0.000 description 8
- 238000002156 mixing Methods 0.000 description 8
- 239000011496 polyurethane foam Substances 0.000 description 8
- 239000002994 raw material Substances 0.000 description 8
- 238000007873 sieving Methods 0.000 description 8
- 238000001914 filtration Methods 0.000 description 7
- 239000010410 layer Substances 0.000 description 7
- 239000000853 adhesive Substances 0.000 description 6
- 230000001070 adhesive effect Effects 0.000 description 6
- 230000007547 defect Effects 0.000 description 6
- 239000002657 fibrous material Substances 0.000 description 6
- RMAQACBXLXPBSY-UHFFFAOYSA-N silicic acid Chemical compound O[Si](O)(O)O RMAQACBXLXPBSY-UHFFFAOYSA-N 0.000 description 6
- 239000000395 magnesium oxide Substances 0.000 description 5
- HBMJWWWQQXIZIP-UHFFFAOYSA-N silicon carbide Chemical compound [Si+]#[C-] HBMJWWWQQXIZIP-UHFFFAOYSA-N 0.000 description 5
- 229910010271 silicon carbide Inorganic materials 0.000 description 5
- 238000007711 solidification Methods 0.000 description 5
- 230000008023 solidification Effects 0.000 description 5
- 238000005253 cladding Methods 0.000 description 4
- 229910052751 metal Inorganic materials 0.000 description 4
- 239000002184 metal Substances 0.000 description 4
- 238000004513 sizing Methods 0.000 description 4
- 239000004925 Acrylic resin Substances 0.000 description 3
- 229920000178 Acrylic resin Polymers 0.000 description 3
- 230000008901 benefit Effects 0.000 description 3
- KZHJGOXRZJKJNY-UHFFFAOYSA-N dioxosilane;oxo(oxoalumanyloxy)alumane Chemical compound O=[Si]=O.O=[Si]=O.O=[Al]O[Al]=O.O=[Al]O[Al]=O.O=[Al]O[Al]=O KZHJGOXRZJKJNY-UHFFFAOYSA-N 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
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- 229910052863 mullite Inorganic materials 0.000 description 3
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- 239000004814 polyurethane Substances 0.000 description 3
- 239000011241 protective layer Substances 0.000 description 3
- 239000000779 smoke Substances 0.000 description 3
- DGXAGETVRDOQFP-UHFFFAOYSA-N 2,6-dihydroxybenzaldehyde Chemical compound OC1=CC=CC(O)=C1C=O DGXAGETVRDOQFP-UHFFFAOYSA-N 0.000 description 2
- KXGFMDJXCMQABM-UHFFFAOYSA-N 2-methoxy-6-methylphenol Chemical compound [CH]OC1=CC=CC([CH])=C1O KXGFMDJXCMQABM-UHFFFAOYSA-N 0.000 description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- BPQQTUXANYXVAA-UHFFFAOYSA-N Orthosilicate Chemical compound [O-][Si]([O-])([O-])[O-] BPQQTUXANYXVAA-UHFFFAOYSA-N 0.000 description 2
- 239000004642 Polyimide Substances 0.000 description 2
- 229920001807 Urea-formaldehyde Polymers 0.000 description 2
- XTXRWKRVRITETP-UHFFFAOYSA-N Vinyl acetate Chemical compound CC(=O)OC=C XTXRWKRVRITETP-UHFFFAOYSA-N 0.000 description 2
- DHKHKXVYLBGOIT-UHFFFAOYSA-N acetaldehyde Diethyl Acetal Natural products CCOC(C)OCC DHKHKXVYLBGOIT-UHFFFAOYSA-N 0.000 description 2
- 125000002777 acetyl group Chemical class [H]C([H])([H])C(*)=O 0.000 description 2
- 229920003180 amino resin Polymers 0.000 description 2
- 239000004927 clay Substances 0.000 description 2
- 229910052570 clay Inorganic materials 0.000 description 2
- 239000000805 composite resin Substances 0.000 description 2
- 230000007797 corrosion Effects 0.000 description 2
- 238000005260 corrosion Methods 0.000 description 2
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- 238000001125 extrusion Methods 0.000 description 2
- 238000010304 firing Methods 0.000 description 2
- OIAUFEASXQPCFE-UHFFFAOYSA-N formaldehyde;1,3-xylene Chemical compound O=C.CC1=CC=CC(C)=C1 OIAUFEASXQPCFE-UHFFFAOYSA-N 0.000 description 2
- 239000007849 furan resin Substances 0.000 description 2
- AXZKOIWUVFPNLO-UHFFFAOYSA-N magnesium;oxygen(2-) Chemical compound [O-2].[Mg+2] AXZKOIWUVFPNLO-UHFFFAOYSA-N 0.000 description 2
- 238000011056 performance test Methods 0.000 description 2
- 239000005011 phenolic resin Substances 0.000 description 2
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- 239000011148 porous material Substances 0.000 description 2
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- 229920002554 vinyl polymer Polymers 0.000 description 2
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- 229910010293 ceramic material Inorganic materials 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- RGPUVZXXZFNFBF-UHFFFAOYSA-K diphosphonooxyalumanyl dihydrogen phosphate Chemical compound [Al+3].OP(O)([O-])=O.OP(O)([O-])=O.OP(O)([O-])=O RGPUVZXXZFNFBF-UHFFFAOYSA-K 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 239000000945 filler Substances 0.000 description 1
- 239000012065 filter cake Substances 0.000 description 1
- 239000006261 foam material Substances 0.000 description 1
- 239000000499 gel Substances 0.000 description 1
- 238000003837 high-temperature calcination Methods 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 239000007791 liquid phase Substances 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 description 1
- NBIIXXVUZAFLBC-UHFFFAOYSA-K phosphate Chemical compound [O-]P([O-])([O-])=O NBIIXXVUZAFLBC-UHFFFAOYSA-K 0.000 description 1
- 239000002694 phosphate binding agent Substances 0.000 description 1
- 229920003023 plastic Polymers 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 239000002984 plastic foam Substances 0.000 description 1
- 229920002635 polyurethane Polymers 0.000 description 1
- 230000035939 shock Effects 0.000 description 1
- 239000000741 silica gel Substances 0.000 description 1
- 229910002027 silica gel Inorganic materials 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 230000003746 surface roughness Effects 0.000 description 1
- 230000002277 temperature effect Effects 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
- 230000008016 vaporization Effects 0.000 description 1
Classifications
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- 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
- C04B38/0615—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 the burned-out substance being a monolitic element having approximately the same dimensions as the final article, e.g. a porous polyurethane sheet or a prepreg obtained by bonding together resin particles
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D39/00—Filtering material for liquid or gaseous fluids
- B01D39/14—Other self-supporting filtering material ; Other filtering material
- B01D39/20—Other self-supporting filtering material ; Other filtering material of inorganic material, e.g. asbestos paper, metallic filtering material of non-woven wires
- B01D39/2068—Other inorganic materials, e.g. ceramics
- B01D39/2093—Ceramic foam
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- 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
- C04B35/10—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 aluminium oxide
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/622—Forming processes; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
- C04B2235/02—Composition of constituents of the starting material or of secondary phases of the final product
- C04B2235/30—Constituents and secondary phases not being of a fibrous nature
- C04B2235/34—Non-metal oxides, non-metal mixed oxides, or salts thereof that form the non-metal oxides upon heating, e.g. carbonates, nitrates, (oxy)hydroxides, chlorides
- C04B2235/3418—Silicon oxide, silicic acids, or oxide forming salts thereof, e.g. silica sol, fused silica, silica fume, cristobalite, quartz or flint
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
- C04B2235/02—Composition of constituents of the starting material or of secondary phases of the final product
- C04B2235/30—Constituents and secondary phases not being of a fibrous nature
- C04B2235/34—Non-metal oxides, non-metal mixed oxides, or salts thereof that form the non-metal oxides upon heating, e.g. carbonates, nitrates, (oxy)hydroxides, chlorides
- C04B2235/3427—Silicates other than clay, e.g. water glass
- C04B2235/3463—Alumino-silicates other than clay, e.g. mullite
- C04B2235/3481—Alkaline earth metal alumino-silicates other than clay, e.g. cordierite, beryl, micas such as margarite, plagioclase feldspars such as anorthite, zeolites such as chabazite
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- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
- C04B2235/60—Aspects relating to the preparation, properties or mechanical treatment of green bodies or pre-forms
- C04B2235/602—Making the green bodies or pre-forms by moulding
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
- C04B2235/60—Aspects relating to the preparation, properties or mechanical treatment of green bodies or pre-forms
- C04B2235/606—Drying
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
- C04B2235/65—Aspects relating to heat treatments of ceramic bodies such as green ceramics or pre-sintered ceramics, e.g. burning, sintering or melting processes
- C04B2235/656—Aspects relating to heat treatments of ceramic bodies such as green ceramics or pre-sintered ceramics, e.g. burning, sintering or melting processes characterised by specific heating conditions during heat treatment
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
- C04B2235/65—Aspects relating to heat treatments of ceramic bodies such as green ceramics or pre-sintered ceramics, e.g. burning, sintering or melting processes
- C04B2235/656—Aspects relating to heat treatments of ceramic bodies such as green ceramics or pre-sintered ceramics, e.g. burning, sintering or melting processes characterised by specific heating conditions during heat treatment
- C04B2235/6567—Treatment time
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
- C04B2235/70—Aspects relating to sintered or melt-casted ceramic products
- C04B2235/96—Properties of ceramic products, e.g. mechanical properties such as strength, toughness, wear resistance
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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
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
Abstract
The application discloses a foam ceramic filter and a preparation method thereof, and relates to the technical field of filters for casting. The preparation method of the foam ceramic filter comprises the following steps: coating the side surface of the foam raw sheet by adopting a coating material to form a coating layer, coating the ceramic slurry on the foam raw sheet provided with the coating layer, and drying and sintering to obtain the foam ceramic filter. The application effectively solves the problem of slag falling of the foam ceramic filter, is easy to control the operation process, is particularly suitable for a mechanized production line with higher automation degree, can greatly improve the production efficiency and reduces the preparation cost.
Description
Technical Field
The application relates to the technical field of filters for casting, in particular to a foam ceramic filter and a preparation method thereof.
Background
The foam ceramic filter is a porous ceramic product with a porosity up to 70% -90%, a three-dimensional network skeleton and an interpenetrating pore structure. As a novel inorganic nonmetallic filter material, the foamed ceramic has the advantages of light weight, high porosity, large specific surface area, high strength, high temperature resistance, corrosion resistance, good thermal shock resistance and the like besides the performances of common ceramics such as high temperature resistance, corrosion resistance and the like, and is widely applied to various industries such as molten metal filtration, air filtration, filler filtration and the like. When the foam ceramic filter is used for filtering molten metal, the defects of casting sand holes, slag holes, air holes, impurities and the like can be effectively reduced due to the functions of filtering, rectifying, adsorbing and filter cakes, the casting quality and the yield are improved, the surface quality is improved, the machining performance is improved, and the mechanical performance is improved.
Because of the porous skeleton structure of the foam ceramic filter, the side edges of the foam ceramic filter have more burrs and bulges. If the side face of the foam ceramic filter is not sealed, burrs and bulges with uneven periphery are easily scraped and rubbed to produce the slag falling problem in the production, circulation and carrying processes of the filter, so that the dimensional accuracy of the filter is affected. Meanwhile, when the foam ceramic filter is placed in the casting mold, sand falling caused by touching of burrs on the periphery of the filter to a sand cavity is easy to occur, so that sand inclusion defect of castings is caused.
Currently, in order to solve the problem of slag drop, US4568595 discloses a method of forming a solid layer by coating a filter by brushing, spraying or coating the edges of a foam filter with a ceramic slurry of an added binder, followed by drying and sintering, which has the disadvantage of being difficult to automate and forming surface roughness. The coating material easily penetrates into the pores of the ceramic foam and the coating size is difficult to control precisely. In addition, there is a method of wrapping the periphery of the ceramic foam filter by using fiber materials, but the fiber materials have lower protection strength, and slag falling phenomenon is easy to occur when the periphery of the ceramic foam filter is extruded. Meanwhile, common fiber materials such as fiber paper and the like contain organic binders, so that smoke is easy to generate when a filter wrapped by the fiber materials is adopted for metal filtration and casting, and the smoke can enter castings to form defects, and meanwhile, the environment protection problem is easy to generate. As another example, CN200620161459.0 discloses a sealed ceramic foam filter for casting, a layer of organic protective layer which can be decomposed at high temperature is adhered to the periphery of the ceramic foam, when casting, the organic protective layer can be decomposed due to the high temperature effect of molten iron, slag can be reduced, but the strength of the organic protective layer is low, and gas can be generated when casting, so that the casting quality is affected. CN201911212694.4 discloses a banding method of ceramic foam filter for casting, the periphery of the dried but unsintered filter biscuit is tightly wrapped by a film for banding, then the slurry is smeared outside the film, and the filter is obtained by drying and high-temperature calcination treatment, but the method is easy to damage the filter biscuit during molding, the yield is low, and the obtained outer coating of the filter is easy to delaminate and has low strength.
Disclosure of Invention
In view of the defects of the technology, the application effectively solves the slag falling problem of the foam ceramic filter by providing the foam ceramic filter and the preparation method thereof, is easy to control the operation process, is particularly suitable for a mechanized production line with higher automation degree, can greatly improve the production efficiency and reduces the preparation cost.
In order to achieve the above purpose, the present application mainly provides the following technical solutions:
the embodiment of the application provides a preparation method of a foam ceramic filter, which comprises the following steps:
coating the side surface of the foam sheet by adopting a coating material to form a coating layer,
and then, carrying out ceramic slurry coating on the foam raw sheet provided with the coating layer, and then drying and sintering to obtain the foam ceramic filter.
Preferably, the preparation method further comprises: when the foam raw sheet provided with the coating layer is subjected to slurry coating, the two ends of the foam raw sheet coated with the slurry and not provided with the coating layer are extruded.
Preferably, the strip of coating material is wrapped around the sides of the foam sheet at least one turn to form a coating.
Preferably, the coating material is selected from cloth or plastic film.
Preferably, the cloth is selected from cotton cloth, linen, silk, wool, rayon, synthetic fiber, or nonwoven; the plastic film is selected from Polyethylene (PE), polyvinyl chloride (PVC), polystyrene (PS), polyester film (PET), polypropylene (PP) or nylon.
Preferably, the coating layer and the foam sheet are bonded by an adhesive.
Preferably, the binder is selected from the group consisting of organic resin glue, phosphate binder or silicate binder. Preferably, the organic resin glue is selected from the group consisting of silicone gel, epoxy resin glue, polyurethane (PU) glue, amino resin glue, phenolic resin glue, acrylic resin glue, furan resin glue, resorcinol-formaldehyde resin glue, xylene-formaldehyde resin glue, unsaturated polyester glue, composite resin glue, polyimide glue, urea resin glue, polyvinyl acetal or vinyl acetate emulsion glue.
Preferably, the thickness of the coating layer is 0.1-5 mm. Preferably, the thickness of the cladding layer may be 0.1mm, 0.2mm, 0.5mm, 1mm, 2mm, 3mm, 4mm or 5mm.
Preferably, the width of the coating is not greater than the side height of the foam sheet. Preferably, the width of the coating is equal to the side height of the foam sheet.
The embodiment of the application also provides the foam ceramic filter prepared by the preparation method of the foam ceramic filter.
One or more technical solutions provided in the embodiments of the present application at least have the following technical effects or advantages:
according to the preparation method provided by the embodiment of the application, the edge is covered before the primary foam sheet is coated with slurry, the coating layer can form a slurry coating boundary with smooth periphery of the primary foam sheet, so that the foam ceramic filter biscuit with no burrs on the side surface is obtained, the edge and the inside of the ceramic filter biscuit form a complete integral structure, and after sintering, the formed hard ceramic edge sealing and the inside of the ceramic filter are also integrated. Therefore, the prepared foam ceramic filter has the characteristics of flatness, high strength and high temperature resistance, and side sand hanging and slag falling phenomena can not occur in the production, transportation, installation and use processes, and the casting quality can not be influenced.
In the preparation method provided by the embodiment of the application, after the coated foam raw sheet is subjected to slurry coating and drying, the coating layer and the ceramic filter biscuit are sintered together without removing the coating layer, so that the coating layer and the foam raw sheet are burnt together, the integrity of the ceramic filter biscuit before a ceramic filter finished product is obtained can be ensured, the problem of damaging the ceramic filter biscuit is avoided, and the low yield of the finished product caused by improper operation in the production process is avoided; meanwhile, the operation process is easy to control, so that the method is particularly suitable for a mechanized production line with higher automation degree, the production efficiency can be greatly improved, and the preparation cost can be reduced.
In the preparation method provided by the embodiment of the application, when the coating material is adopted to carry out edge coating on the side surface of the foam raw sheet, as the texture of the foam raw sheet is softer, the small protrusions on the side surface of the foam raw sheet can be completely coated in the coating layer, after the foam raw sheet is sized, the small protrusions on the side surface of the foam raw sheet can be completely buried in the ceramic slurry, and the gaps on the side surface of the foam raw sheet can be filled with the ceramic slurry, so that a ceramic filter biscuit with a smoother side surface can be formed, and a foam ceramic filter with smooth hard ceramic edge sealing can be obtained. The preparation method simultaneously carries out the preparation process and the edge sealing process of the foam ceramic filter, thereby greatly simplifying the production process and improving the production efficiency.
Detailed Description
In order to further describe the technical means and effects adopted for achieving the purpose of the preset application, the following detailed description refers to the specific implementation, structure, characteristics and effects according to the present application in combination with the preferred embodiments.
Because of the porous skeleton structure of the foam ceramic filter, the side edges of the foam ceramic filter have more burrs and bulges. If the side face of the foam ceramic filter is not sealed, burrs and bulges with uneven periphery are easily scraped and rubbed to produce the slag falling problem in the production, circulation and carrying processes of the filter, so that the dimensional accuracy of the filter is affected. Meanwhile, when the foam ceramic filter is placed in the casting mold, sand falling caused by touching of burrs on the periphery of the filter to a sand cavity is easy to occur, so that sand inclusion defect of castings is caused. In order to solve the problem of slag falling, the method for wrapping the foam ceramic filter by using the commonly used fiber materials has lower protection strength, and the fiber materials are easy to generate smoke when filtering molten metal, and can enter castings to form defects.
In order to solve the problems, the embodiment of the application provides the following technical scheme, and the general idea is as follows:
the embodiment of the application provides a preparation method of a foam ceramic filter, which comprises the following steps:
coating the side surface of the foam sheet by adopting a coating material to form a coating layer,
and then, carrying out ceramic slurry coating on the foam raw sheet provided with the coating layer, and then drying and sintering to obtain the foam ceramic filter.
Specifically, the raw foam sheet is firstly subjected to edge wrapping, and then the raw foam sheet subjected to edge wrapping is subjected to slurry coating, so that the ceramic filter biscuit with no burrs on the side surface can be obtained through the step. After sintering, the coating layer and the foam raw sheet are burnt out together to form the foam ceramic filter with the hard ceramic edge sealing.
The foam sheet in the present application refers to a foam material used as a carrier for ceramic filter production, and any flammable organic plastic foam material having elasticity and capable of recovering the original shape can be used. The foam must be capable of burning or vaporizing materials such as polyurethane at temperatures below the firing temperature of the ceramic materials used. The foam plastic is cut into a certain shape and size and then used as a foam raw sheet.
The methods of making a ceramic foam filter provided by the present application may include conventional ceramic foam filter making techniques including making a ceramic slurry, coating the slurry with the foam by impregnating the foam with the slurry and then extruding excess slurry out of the foam, and drying the foam to remove the liquid phase of the slurry, forming a rigid green body by a drying step, and then placing the dried green body in a kiln (e.g., tunnel kiln) and subjecting it to a firing process that may include a plurality of thermal gradients and time periods to fire the filter.
Specifically, the preparation method is suitable for preparing any foam ceramic filter needing edge sealing, including, but not limited to, alumina, magnesia, zirconia, silicon carbide, carbon foam ceramic filters and the like. Accordingly, the ceramic slurry used in the preparation method may be alumina, magnesia, zirconia, silicon carbide, carbonaceous, or the like type ceramic slurry.
According to the preparation method provided by the embodiment of the application, the edge is covered before the raw foam sheet is pulped, the coating layer can form a smooth pulp hanging boundary around the raw foam sheet, so that the foam ceramic filter biscuit with no burrs on the side surface is obtained, the edge and the inside of the ceramic filter biscuit form a complete integral structure, and after sintering, the formed hard ceramic edge sealing and the inside of the ceramic filter are also integrated. Therefore, the prepared foam ceramic filter has the characteristics of flatness, high strength and high temperature resistance, and side sand hanging and slag falling phenomena can not occur in the production, transportation, installation and use processes, and the casting quality can not be influenced.
In the preparation method provided by the embodiment of the application, after the coated foam raw sheet is subjected to slurry coating and drying, the coating layer and the ceramic filter biscuit are sintered together without removing the coating layer, so that the coating layer and the foam raw sheet are burnt out together, the integrity of the ceramic filter biscuit before a ceramic filter finished product is obtained can be ensured, the problem of damaging the ceramic filter biscuit is avoided, and the low yield of the finished product caused by improper operation in the production process is avoided; meanwhile, the operation process is easy to control, so that the method is particularly suitable for a mechanized production line with higher automation degree, the production efficiency can be greatly improved, and the preparation cost can be reduced.
In the preparation method provided by the embodiment of the application, when the coating material is adopted to carry out edge coating on the side surface of the foam raw sheet, as the texture of the foam raw sheet is softer, the small protrusions on the side surface of the foam raw sheet can be completely coated in the coating layer, after the foam raw sheet is sized, the small protrusions on the side surface of the foam raw sheet can be completely buried in the ceramic slurry, and the gaps on the side surface of the foam raw sheet can be filled with the ceramic slurry, so that a ceramic filter biscuit with a smoother side surface can be formed, and a foam ceramic filter with smooth hard ceramic edge sealing can be obtained. The preparation method simultaneously carries out the preparation process and the edge sealing process of the foam ceramic filter, thereby greatly simplifying the production process and improving the production efficiency.
In some embodiments of the application, in the above-described method of preparation, the sides of the foam sheet are wrapped at least one turn with a strip of wrapping material to form the wrapping layer. The coating material may be cut into strips of a certain width and wrapped around the sides of the foam sheet to form a coating. The strip-shaped coating material is adopted to wind the side surface of the foam raw sheet, so that the coating material can be ensured to form a complete closed slurry hanging boundary, the coating material is attached to the side surface of the foam raw sheet, and the gap between the coating material and the side surface of the foam raw sheet is ensured to be uniform, so that the ceramic edge sealing with uniform thickness is formed.
In some embodiments of the application, the coating material is selected from soft coating materials, preferably cloth or plastic films. Cloth types include, but are not limited to, cotton, linen, silk, wool, rayon, synthetic fibers, or nonwoven; plastic films include, but are not limited to, polyethylene (PE), polyvinylchloride (PVC), polystyrene (PS), polyester film (PET), polypropylene (PP), or nylon.
In some embodiments of the present application, the above preparation method further comprises: when the foam raw sheet provided with the coating layer is subjected to slurry coating, the two ends of the foam raw sheet coated with the slurry and not provided with the coating layer are extruded. Through the extrusion step, the ceramic slurry can fully fill the gaps between the coating layer and the foam raw sheet, so that the periphery of the obtained foam ceramic filter biscuit is smooth, burrs and bulges are avoided, and the strength of the edge of the sintered foam ceramic filter can be improved. In addition, the redundant slurry can be extruded from the foam raw sheet, so that the slurry in the foam raw sheet is uniformly sized, and the quality of the foam ceramic filter is improved. The strip-shaped coating material is wound on the side surface of the foam raw sheet, and when sizing extrusion is carried out, a sizing boundary with stable size can be formed on the foam raw sheet, so that the size precision of the finished product of the foam ceramic filter can be controlled.
In some embodiments of the application, the coating layer is bonded to the foam sheet by an adhesive when coating the sides of the foam sheet. Through the step, the coating layer can be stably attached to the outer side of the foam sheet, and falling and shifting in the subsequent operation process are avoided.
In some embodiments of the application, the binder is selected from an organic resin glue or an inorganic binder. Organic resin gums include, but are not limited to, silicone gum, epoxy resin gum, polyurethane (PU) gum, amino resin gum, phenolic resin gum, acrylic resin gum, furan resin gum, resorcinol-formaldehyde resin gum, xylene-formaldehyde resin gum, unsaturated polyester gum, composite resin gum, polyimide gum, urea resin gum, polyvinyl acetal, vinyl acetate emulsion gum, and other polymeric gums; inorganic binders include, but are not limited to, phosphate binders, silicate binders, and other inorganic binders.
In some embodiments of the application, the thickness of the cladding layer is 0.1 to 5mm. For example, the thickness of the cladding layer may be 0.1mm, 0.2mm, 0.5mm, 1mm, 2mm, 3mm, 4mm, 5mm, or any range or subrange therebetween. The thickness of the coating layer can be determined according to the thickness of the coating material so as to ensure that the coating material is wound on the side surface of the foam raw sheet at least one circle.
In some embodiments of the application, the width of the cladding layer is no greater than the side height of the foam sheet. When the width of the coating layer is smaller than or equal to the side height of the foam sheet, the coating layer does not protrude out of both ends of the foam sheet. When the coating layer protrudes at two ends of the foam sheet, sharp corner protrusions are formed at the protruding positions of the coating layer after sizing, so that end face burrs of a finished product of the foam ceramic filter are formed, and slag falling phenomenon is caused. Preferably, the width of the coating layer is equal to the height of the sides of the foam sheet.
The application also provides the foam ceramic filter prepared by the preparation method, the foam ceramic filter is provided with the ceramic edge sealing, the edge sealing process is not needed, the edge of the foam ceramic filter has the characteristics of flatness, high strength and high temperature resistance, and the side sand hanging and slag dropping phenomena can not occur in the production, transportation, installation and use processes, and the casting quality can not be influenced.
The following examples are non-limiting and merely illustrative, the scope of the application being defined by the claims.
Example 1
Taking the preparation of an alumina foam ceramic filter as an example. Firstly, a polyurethane foam sample block with the length and width of 70mm and the height of 70mm and 20mm is punched by a die, cotton cloth is cut into a strip with the height of 20mm and the length of 300mm, acrylic resin glue is coated on one side of a cloth strip, one side of the cloth strip, which is glued, is attached to the side face of the foam sample block for bonding, and two sides of the cloth strip are aligned with two ends of the foam sample block and are wound on the side face of the foam sample block. And (3) after bonding and solidification, preparing alumina slurry for foam ceramic at the same time, and mixing the following raw material components in parts by weight: alumina-clay-silica sol=7:2:1, ball milling the mixture for 2 hours, sieving with a 200-mesh sieve to obtain slurry, hanging the foam sample block with the slurry, and extruding the two ends of the foam sample block, which are not covered with cloth strips. And then drying at 60-120 ℃ for 1h to form the foam ceramic filter biscuit. Sintering the ceramic foam filter biscuit at 1300 ℃ for 1h, and burning foam and cotton cloth to form a finished ceramic foam filter product with edge sealing.
Example 2
Taking the preparation of zirconia foam ceramic filter as an example. Firstly, a polyurethane foam sample block with the diameter of 75mm and the height of 25mm is punched by using a mould, a polyethylene film is cut into long strips with the height of 25mm and the length of 250mm, aluminum dihydrogen phosphate adhesive is used for coating one side of the polyethylene film and the side surface of the foam sample block, one side of the polyethylene film coated with the adhesive is adhered to the side surface of the foam sample block for bonding, and two sides of the polyethylene film are aligned with two ends of the foam sample block and wound on the side surface of the foam sample block. And (3) after bonding and solidification, preparing zirconia slurry for foam ceramic at the same time, and mixing the following raw material components in parts by weight: zirconia, alumina and silica sol=8:1:1, ball milling the mixture for 1h and sieving the mixture with a 100-mesh sieve to obtain slurry, hanging slurry on the foam sample block by adopting the slurry, and extruding the two ends of the foam sample block which are not coated with the polyethylene film. And then drying at 60-120 ℃ for 1h to form the foam ceramic filter biscuit. Sintering the ceramic foam filter biscuit at 1600 ℃ for 2 hours, and burning the foam and the polyethylene film to form a finished ceramic foam filter product with edge sealing.
Example 3
Taking the preparation of a silicon carbide foam ceramic filter as an example. Firstly, a polyurethane foam sample block with the length and width of 100mm and the height of 100mm and 22mm is punched by a die, a non-woven fabric is cut into a strip with the height of 22mm and the length of 400mm, one side of a cloth strip is coated with organic silica gel, one side of the cloth strip coated with the adhesive is adhered to the side face of the foam sample block for bonding, and two sides of the cloth strip are aligned with two ends of the foam sample block and wound on the side face of the foam sample block. And (3) after bonding and solidification, preparing silicon carbide slurry for foam ceramics at the same time, and mixing the following raw material components in parts by weight: silicon carbide, aluminum oxide and silica sol=6:3:1, ball milling the mixture for 2 hours, sieving with a 100-mesh sieve to obtain slurry, hanging the foam sample block with the slurry, and extruding the two ends of the foam sample block, which are not coated with cloth strips. And then drying at 60-120 ℃ for 1h to form the foam ceramic filter biscuit. Sintering the ceramic foam filter biscuit at 1280 ℃ for 1.5 hours, and burning foam and non-woven fabrics to form a finished ceramic foam filter product with edge sealing.
Example 4
Taking magnesia foam ceramic filter as an example. Firstly, a polyurethane foam sample block with the diameter of 50mm and the height of 20mm is punched by using a mould, a polyester film is cut into a strip with the height of 20mm and the length of 160mm, silica sol is coated on one side of the polyester film, one side of the polyester film coated with the adhesive is attached to the side face of the foam sample block for bonding, and two sides of the polyester film are aligned with two ends of the foam sample block and wound on the side face of the foam sample block. And (3) after bonding and solidification, preparing magnesium oxide slurry for foam ceramic at the same time, and mixing the following raw material components in parts by weight: magnesium oxide and cellulose=9:1, ball milling the mixture for 1h and sieving the mixture with a 100-mesh sieve to obtain slurry, hanging the foam sample block by adopting the slurry, and extruding the two ends of the foam sample block, which are not coated with the polyester film. And then drying at 60-120 ℃ for 1h to form the foam ceramic filter biscuit. Sintering the ceramic foam filter biscuit at 1400 ℃ for 1h, and burning foam and polyester film to form the finished product of the ceramic foam filter with edge sealing.
Example 5
Taking mullite ceramic foam filter as an example. Firstly, a polyurethane foam sample block with the length and width of 60mm and the height of 60mm and the length of 22mm is punched by a die, linen is cut into a strip with the height of 22mm and the length of 240mm, epoxy resin glue is coated on one side of the cloth strip, which is glued, is attached to the side face of the foam sample block for bonding, and two sides of the cloth strip are aligned with two ends of the foam sample block and are wound on the side face of the foam sample block. And (3) after bonding and solidification, preparing mullite slurry for foamed ceramics at the same time, and mixing the following raw material components in parts by weight: mullite, alumina, silica sol=3:6:1, ball milling the mixture for 2 hours, sieving with a 100-mesh sieve to obtain slurry, hanging the foam sample block with the slurry, and extruding the two ends of the foam sample block, which are not coated with cloth strips. And then drying at 60-120 ℃ for 1h to form the foam ceramic filter biscuit. Sintering the foam ceramic filter biscuit at 1100 ℃ for 0.5h, and burning foam and linen out to form a finished product of the foam ceramic filter with edge sealing.
Comparative example 1
Taking the preparation of an alumina foam ceramic filter as an example. Firstly, blanking polyurethane foam sample blocks with length, width and height of 70mm 20mm by using a die, preparing alumina slurry for foam ceramics, and mixing the following raw material components in percentage by weight: alumina, clay and silica sol=7:2:1, ball milling the mixture for 2 hours, sieving with a 200-mesh sieve to obtain slurry, hanging the foam sample block with the slurry, and extruding out the redundant slurry. Cutting cotton cloth into strips with the height of 20mm and the length of 300mm, attaching the cloth strips to the side surfaces of the foam sample blocks after sizing, aligning the two sides of the cloth strips with the two ends of the foam sample blocks, winding the cloth strips on the side surfaces of the foam sample blocks, and drying at 60-120 ℃ for 1h to form a foam ceramic filter biscuit. Sintering the ceramic foam filter biscuit at 1300 ℃ for 1h, burning foam and cotton cloth to form a ceramic foam filter finished product, wherein layering and cracking of the side face of the ceramic foam filter occur, and the edge sealing is not compact.
Comparative example 2
Taking the preparation of an alumina foam ceramic filter as an example. Firstly, blanking polyurethane foam sample blocks with length, width and height of 70mm 20mm by using a die, preparing alumina slurry for foam ceramics, and mixing the following raw material components in percentage by weight: alumina-clay-silica sol=7:2:1, ball milling the mixture for 2h and sieving with a 200-mesh sieve to obtain slurry, hanging slurry on a foam sample block by adopting the slurry, cutting cotton cloth into strips with the height of 20mm and the length of 300mm, attaching cloth strips to the side surfaces of the foam sample block after hanging slurry, aligning two sides of the cloth strips with two ends of the foam sample block, winding the two ends of the foam sample block on the side surfaces of the foam sample block, and extruding the two ends of the foam sample block to squeeze out excessive slurry. And then drying at 60-120 ℃ for 1h to form the foam ceramic filter biscuit. The foam ceramic filter biscuit is sintered for 1h at 1300 ℃, foam and cotton cloth are burnt out to form a foam ceramic filter finished product, and the side surface of the foam ceramic filter does not form a complete and compact edge sealing and has a small amount of burrs due to the fact that the cloth attached to the side surface of the foam sample block shifts in the process of extruding the foam sample block.
Comparative example 3
Taking the preparation of an alumina foam ceramic filter as an example. Firstly, blanking polyurethane foam sample blocks with length, width and height of 70mm 20mm by using a die, preparing alumina slurry for foam ceramics, and mixing the following raw material components in percentage by weight: alumina, clay and silica sol=7:2:1, ball milling the mixture for 2 hours and sieving the mixture with a 200-mesh sieve to obtain the slurry. And (5) adopting the slurry to carry out slurry coating on the foam sample block, and extruding out redundant slurry. And then drying at 60-120 ℃ for 1h to form the foam ceramic filter biscuit. The green foam ceramic filter is sintered for 1h at 1300 ℃, foam is burnt out, and a finished foam ceramic filter product is formed, and the side face of the foam ceramic filter is not sealed with edges and has a large number of burrs.
The ceramic foam filters prepared in the above examples and comparative examples were subjected to performance tests, and the test results shown in table 1 were obtained. Wherein, the normal temperature compressive strength and the high temperature bending strength are tested according to the GB/T25139-2010 standard.
TABLE 1 results of foam ceramic Filter Performance test
As can be seen from Table 1, the alumina foam filter with edge seals prepared in example 1 of the present application had higher room temperature compressive strength and higher high temperature flexural strength than the alumina foam filter with edge seals prepared in comparative examples 1 and 2 and comparative example 3 without edge seals.
In terms of slag removal rate, the foam ceramic filters with edge sealing prepared in examples 1-5 of the present application only have a very small slag removal rate; the filters of comparative examples 1 and 2 have a high slag removal rate, and the non-edge sealed filter of comparative example 3 has a higher slag removal rate, and these filters having a high slag removal rate have a serious influence on the quality of castings in casting production. Therefore, the foam ceramic filter with the edge sealing prepared by the preparation method provided by the application can obviously solve the problem of slag falling in the actual casting process, can obviously improve the casting yield, and has great economic benefit.
It should be noted that, in the present application, different "an embodiment" or "an embodiment" does not necessarily refer to the same embodiment. Furthermore, the particular features, structures, or characteristics of one or more embodiments may be combined in any suitable manner. It should be understood that the examples of the present application are illustrative of the present application and are not intended to limit the scope of the present application.
In the present disclosure, a range may be expressed as from "about" one particular value, and/or to "about" another particular value. When such a range is expressed, examples include from the one particular value and/or to the other particular value. Similarly, when values are expressed as approximations, by use of the antecedent "about," it will be understood that the particular value forms another aspect. It will also be understood that the endpoints of each of the ranges are significant both in relation to the other endpoint, and independently of the other endpoint.
No method described herein is intended to be construed as requiring that its steps be performed in a specific order unless otherwise indicated. Thus, when a method claim does not actually recite an order to be followed by its steps or it is not otherwise specifically expressed in the claims or descriptions that the steps are limited to a specific order, it is not intended that such an order be implied.
While the transition word "comprising" may be used to disclose various features, elements, or steps of a particular embodiment, it should be understood that this implies alternative embodiments that include what may be described by the word "consisting of," consisting essentially of. Thus, for example, implicit alternative embodiments to methods comprising a+b+c include embodiments where the method consists of a+b+c and embodiments where the method consists essentially of a+b+c.
Finally, it is noted that the above embodiments are only for illustrating the technical solution of the present application and not for limiting the same, and although the present application has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications and equivalents may be made thereto without departing from the spirit and scope of the technical solution of the present application, which is intended to be covered by the scope of the claims of the present application.
Claims (4)
1. The preparation method of the foam ceramic filter is characterized by comprising the following steps:
coating the side surface of the foam raw sheet by using a coating material to form a coating layer, wherein the coating layer can form a slurry hanging boundary with flat periphery of the foam raw sheet, and the strip-shaped coating material is wound around the side surface of the foam raw sheet at least one circle to form the coating layer, and the coating material is selected from cloth or plastic films; the coating layer is bonded with the foam raw sheet through a bonding agent, wherein the bonding agent is selected from organic resin glue, phosphate bonding agent or silicate bonding agent;
and then carrying out ceramic slurry coating on the foam raw sheet provided with the coating layer, extruding the two ends of the foam raw sheet coated with the slurry and not provided with the coating layer, drying and sintering to obtain the foam ceramic filter with the smooth hard ceramic edge sealing, wherein the hard ceramic edge sealing and the inside of the ceramic filter are integrally formed.
2. The method for preparing a ceramic foam filter according to claim 1, wherein the cloth is selected from cotton cloth, linen, silk, wool, rayon, synthetic fiber, or nonwoven fabric; the plastic film is selected from Polyethylene (PE), polyvinyl chloride (PVC), polystyrene (PS), polyester film (PET), polypropylene (PP) or nylon.
3. The method of manufacturing a ceramic foam filter according to claim 1, wherein the thickness of the coating layer is 0.1 to 5mm.
4. The method of claim 1, wherein the width of the coating is no greater than the height of the sides of the foam sheet.
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