CN107973616A - A kind of ceramic filter and preparation method thereof - Google Patents
A kind of ceramic filter and preparation method thereof Download PDFInfo
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- CN107973616A CN107973616A CN201711054278.7A CN201711054278A CN107973616A CN 107973616 A CN107973616 A CN 107973616A CN 201711054278 A CN201711054278 A CN 201711054278A CN 107973616 A CN107973616 A CN 107973616A
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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
- C04B38/063—Preparing or treating the raw materials individually or as batches
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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
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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
- C04B35/48—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 zirconium or hafnium oxides, zirconates, zircon or hafnates
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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
- C04B35/66—Monolithic refractories or refractory mortars, including those whether or not containing clay
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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
- C04B2235/32—Metal oxides, mixed metal oxides, or oxide-forming salts thereof, e.g. carbonates, nitrates, (oxy)hydroxides, chlorides
- C04B2235/3205—Alkaline earth oxides or oxide forming salts thereof, e.g. beryllium oxide
- C04B2235/3206—Magnesium oxides or oxide-forming salts thereof
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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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- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
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- Composite Materials (AREA)
- Filtering Materials (AREA)
Abstract
The invention belongs to the filter manufacturing field of filtering molten metal, and in particular to a kind of ceramic filter and preparation method thereof.Comprise the following steps：(1) surface modifier is prepared；(2) surface modifier that will be prepared in step (1) places the uniform surface for being coated in polyurethane foam after a period of time, then room temperature or dry reaction is coating in an oven；(3) refractory material, binding agent and solvent are mixed and made into slurry；(4) by the slurry obtained by step (3) coated in the modified polyurethane foam obtained by step (2)；(5) material after being coated with obtained by drying steps (4), obtains preforming idiosome；(6) the preforming idiosome obtained by step (5) is sintered to obtain ceramic filter.The present invention to polyurethane foam by carrying out surface modification, the film coating for making its Surface Creation contain nano particle, so as to improve the high temperature mechanical strength and thermal shock resistance of filtering foamed ceramics.
Description
Technical field
The invention belongs to the filter manufacturing field of filtering molten metal, and in particular to a kind of ceramic filter and its preparation
Method.
Background technology
Ceramic foam filter be a kind of porosity be up to 70%~90% have 3 D stereo network skeleton and mutually
Penetrate through air hole structure porous ceramic articles, due to it with high temperature resistant, corrosion-resistant, the porosity is high, specific surface area is big, density
It is small, to fluid from immunity it is strong the features such as, therefore be widely used under high temperature resistant environment filtering flow purification, catalyst carrier etc.
Field.It is used for molten metal filtration, purification, efficient can remove the field trash of bulk and most of as low as micron in molten metal
The small suspension field trash of rank, and promote the precipitation of portion gas, so as to substantially reduce casting wasted product rate, improve casting quality
And yield rate, production cost is reduced, improves production efficiency.
Since being studied successfully first with ceramic foam filter from aluminium alloy in 1978, ceramic foam filter technology obtains
Develop rapidly.Its technique is to use polyurethane foam plastics as carrier, by it immerse by ceramic powders, binding agent, sintering aid,
In slurry made of suspending agent etc., after then extruding unnecessary slurry, dry high temperature firing.As foamed ceramics is in steel industry
Extensive use, particularly steel and alloy than it is great, fusing point is high, it is desirable to the elevated temperature strength of foamed ceramics, softening temperature and anti-
Thermal shock resistance properties will be higher than filtering aluminium, copper.In the prior art to how to improve the elevated temperature strength and heat resistanceheat resistant antidetonation of foamed ceramics
Performance has carried out substantial amounts of research and improvement, such as Hargus et al. is used and is sprayed with machine fibre to its surface before foam impregnation
Dimension, the mud layer that can make to coat on network hole wall thicken, and achieve the purpose that to improve product strength；Patent CN1449312A,
The mechanical strength and thermal shock resistance of filter are improved in EP1421042A1 also by technological improvement.
The content of the invention
It is an object of the invention to provide a kind of ceramic filter and preparation method thereof, can improve filtering foamed ceramics
High temperature mechanical strength and thermal shock resistance；Product of the present invention gives birth to its surface by carrying out surface modification to polyurethane foam
Into the film coating containing nano particle, refractory wass is then coated with the coating layer, and low-temperature sintering forms；It is prepared by the present invention
Ceramic foam filter be remarkably improved elevated temperature strength, thermal shock resistance and the chemical stability of filter, be suitable for molten steel,
The filtering of iron liquid, non-ferrous alloy liquid etc..The nano particle film layer wherein prepared can be zirconium oxide film, pellumina, silica
One or more or other inorganic materials films in film.
A kind of preparation method of ceramic filter, comprises the following steps：
(1) surface modifier is prepared；
(2) polyurethane foam is uniformly coated in after the surface modifier prepared in step (1) being placed a period of time
Surface, then room temperature or dry reaction is coating in an oven；
(3) refractory material, binding agent and solvent are mixed and made into slurry；
(4) by the slurry obtained by step (3) coated in the modified polyurethane foam obtained by step (2)；
(5) material after being coated with obtained by drying steps (4), obtains preforming idiosome；
(6) the preforming idiosome obtained by step (5) is sintered to obtain ceramic filter.
Surface modifier described in step (1) is to be mixed by the one or more in metal salt or metal alkoxide with alcohol or water
Close, then add hydrochloric acid or ammonium hydroxide obtains；Either by Ludox, Aluminum sol, zirconium colloidal sol, nano silicon oxide, nano zircite,
One or more in nano aluminium oxide are mixed with one or more of and water in polyvinyl alcohol, polyethylene glycol, CMC
Arrive.
The metal salt is and is not limited to ZrCl4、Al(NO3)3、SiCl4、Mg(NO3)2、Ca(NO3)2In one kind or several
Kind；Metal alkoxide is and is not limited to ZrO (NO3)3、ZrOCl2, silester, aluminium isopropoxide, one kind in tert-butyl alcohol aluminium or several
Kind.
The standing time of surfactant described in step (2) is 2~24h.
Refractory material described in step (3) is and is not limited to zirconium oxide, corundum, silica, mullite, zirconium silicate, carbonization
One or more in silicon, silicon nitride, kaolin, bentonite, ball clay.
Binding agent described in step (3) is phosphate, sulfate, starch, dextrin, spent pulping liquor, PVA, cellulose, I
One or more in primary glue, resin, Ludox, Aluminum sol.
Sintering temperature described in step (6) is 1000~1600 DEG C.
Ceramic filter prepared by a kind of method as described above.
Compared with prior art, the present invention have the advantages that：
Preparation method of the present invention is modified polyurethane foam, its Surface Creation is contained the thin of nano particle
Membrane coat, improves adhesive strength and thickness of the refractory wass in template；And firing temperature is reduced, while nano modification is thin
Membrane coat can preferentially form the higher skeleton of intensity at a lower temperature, improve the intensity of product, reduce firing defects, raw
Production. art does not have to secondary hanging, convenient and efficient, suitable industrialized production.
Brief description of the drawings
Fig. 1 is unmodified polyurethane foam carrier surface；
Fig. 2 is modified polyurethane foam carrier surface.
Embodiment
The present invention is further explained below in conjunction with drawings and examples：
Embodiment 1
By TEOS, Al (NO3)3, PVA, water, CH3OH is 1 in molar ratio:3:1:40:3, which are configured to solution, is uniformly mixed, and
It is 11 to adjust pH value with ammonium hydroxide, and it is stand-by to obtain coating liquid by 3h in 70 DEG C of environment of placement；
By alumina powder 78wt%, silica powder 22wt% and the water of the PVA and 20wt% that account for powder weight 0.3wt%
It is mixed evenly, it is spare that aging 12h obtains ceramic slurry；
By the shape that 10ppi polyurethane foams are cut into a diameter of 80mm, thickness is 25mm, coating liquid is coated on its surface,
And it is dry under 80 DEG C of environment, repeat the step 3 time and obtain modified polyurethane foam；
Ceramic slurry is coated with polyurethane foam after modification, after dry, sintering is made pottery into foam at 1500 DEG C
Porcelain.
Comparative example 1
By alumina powder 78wt%, silica powder 22wt% and the water of the PVA and 20wt% that account for powder weight 0.3wt%
It is mixed evenly, it is spare that aging 12h obtains ceramic slurry；
By the shape that 10ppi polyurethane foams are cut into a diameter of 80mm, thickness is 25mm；
Ceramic slurry is applied and is hung in unmodified polyurethane foam, after dry, sintering is made pottery into foam at 1500 DEG C
Porcelain.
Embodiment 2
It is 1 in mass ratio by Ludox that content is 30%, PVA, water, nano zircite:0.1:1:0.25 is configured to apply
Film liquid is stand-by；
By zirconia powder 97wt%, magnesia powder 3wt% and account for the Arabic gum and 17wt% of powder weight 0.3wt%
Water be mixed evenly, it is spare that aging 12h obtains ceramic slurry；
By the shape that 10ppi polyurethane foams are cut into a diameter of 80mm, thickness is 25mm, coating liquid is coated on its surface,
And it is dry under 80 DEG C of environment, repeat the step 3 time and obtain modified polyurethane foam；
Ceramic slurry is coated with polyurethane foam after modification, after dry, sintering is made pottery into foam at 1600 DEG C
Porcelain.
Comparative example 2
By zirconia powder 97wt%, magnesia powder 3wt% and account for the Arabic gum and 17wt% of powder weight 0.3wt%
Water be mixed evenly, it is spare that aging 12h obtains ceramic slurry；
By the shape that 10ppi polyurethane foams are cut into a diameter of 80mm, thickness is 25mm；
Ceramic slurry is applied and is hung in unmodified polyurethane foam, after dry, sintering is made pottery into foam at 1600 DEG C
Porcelain.
Correlated performance is tested
| Sequence number | Bulk density (g/cm3) | Bending strength (MPa) | Filter steel quality (kg) |
| Embodiment 1 | 0.52 | 1.6 | 70 |
| Comparative example 1 | 0.40 | 1.1 | 50 |
| Embodiment 2 | 0.87 | 2.5 | 100 |
| Comparative example 2 | 0.6 | 1.8 | 75 |
Note：Filtering steel quality refers to filters steel quality at 1650 DEG C.
Being compared by Fig. 1 and Fig. 2 to obtain, and preparation method of the present invention is modified polyurethane foam, make its surface
The film coating containing nano particle is generated, which can be in zirconium oxide film, pellumina, silicon oxide film
One or more of or other inorganic materials films.
It can be obtained by data in performance test table, nano particle film layer can improve adhesive strength of the refractory wass in template
And thickness, firing temperature is reduced, while nano modification film coating can preferentially form the higher skeleton of intensity at a lower temperature,
The intensity of product is improved, reduces firing defects, production technology does not have to secondary hanging, convenient and efficient, suitable industrialized production.
Ceramic foam filter prepared by the present invention is remarkably improved elevated temperature strength, thermal shock resistance and the chemistry of filter
Stability, is suitable for the filtering of molten steel, iron liquid, non-ferrous alloy liquid etc..
Claims (8)
1. a kind of preparation method of ceramic filter, it is characterised in that comprise the following steps：
(1) surface modifier is prepared；
(2) surface of polyurethane foam will be uniformly coated in after the surface modifier placement a period of time prepared in step (1),
Then room temperature or dry reaction is coating in an oven；
(3) refractory material, binding agent and solvent are mixed and made into slurry；
(4) by the slurry obtained by step (3) coated in the modified polyurethane foam obtained by step (2)；
(5) material after being coated with obtained by drying steps (4), obtains preforming idiosome；
(6) the preforming idiosome obtained by step (5) is sintered to obtain ceramic filter.
2. the preparation method of ceramic filter according to claim 1, it is characterised in that the surface described in step (1) changes
Property agent be to be mixed by the one or more in metal salt or metal alkoxide with alcohol or water, then addition hydrochloric acid or ammonium hydroxide obtain；Or
Person be by Ludox, Aluminum sol, zirconium colloidal sol, nano silicon oxide, nano zircite, nano aluminium oxide it is one or more of with it is poly-
One or more of and water is mixed with to obtain in vinyl alcohol, polyethylene glycol, CMC.
3. the preparation method of ceramic filter according to claim 2, it is characterised in that the metal salt is ZrCl4、Al
(NO3)3、SiCl4、Mg(NO3)2、Ca(NO3)2In one or more；Metal alkoxide is ZrO (NO3)3、ZrOCl2, silicic acid second
One or more in ester, aluminium isopropoxide, tert-butyl alcohol aluminium.
4. the preparation method of ceramic filter according to claim 1 or 2, it is characterised in that the surface described in step (2)
The standing time of activating agent is 2~24h.
5. the preparation method of ceramic filter according to claim 1 or 2, it is characterised in that the fire resisting described in step (3)
Material is one in zirconium oxide, corundum, silica, mullite, zirconium silicate, carborundum, silicon nitride, kaolin, bentonite, ball clay
Kind is several.
6. the preparation method of ceramic filter according to claim 1 or 2, it is characterised in that the bonding described in step (3)
Agent is phosphate, in sulfate, starch, dextrin, spent pulping liquor, PVA, cellulose, Arabic gum, resin, Ludox, Aluminum sol
One or more.
7. the preparation method of ceramic filter according to claim 1 or 2, it is characterised in that the sintering described in step (6)
Temperature is 1000~1600 DEG C.
A kind of 8. ceramic filter prepared such as claim 1-7 any one the method.
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| CN201711054278.7A CN107973616A (en) | 2017-10-31 | 2017-10-31 | A kind of ceramic filter and preparation method thereof |
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| CN201711054278.7A CN107973616A (en) | 2017-10-31 | 2017-10-31 | A kind of ceramic filter and preparation method thereof |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108751998A (en) * | 2018-06-12 | 2018-11-06 | 汉江弘源襄阳碳化硅特种陶瓷有限责任公司 | A kind of silicon nitride combined silicon carbide ceramic filter and preparation method thereof |
| CN110981539A (en) * | 2019-12-30 | 2020-04-10 | 武汉科技大学 | Magnesium oxide based filter containing functional coating multi-pore structure and preparation method thereof |
| CN112759418A (en) * | 2021-01-08 | 2021-05-07 | 武汉科技大学 | Silicon nitride whisker reinforced corundum porous ceramic filter and preparation method thereof |
| CN113831074A (en) * | 2021-10-22 | 2021-12-24 | 武汉盛大长青建材有限公司 | Light sound-insulation terrace slurry containing polyurethane particles, preparation method and light sound-insulation terrace |
| CN115066471A (en) * | 2020-01-31 | 2022-09-16 | 陶氏环球技术有限责任公司 | Coated polyurethane foam |
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2017
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108751998A (en) * | 2018-06-12 | 2018-11-06 | 汉江弘源襄阳碳化硅特种陶瓷有限责任公司 | A kind of silicon nitride combined silicon carbide ceramic filter and preparation method thereof |
| CN108751998B (en) * | 2018-06-12 | 2021-05-11 | 汉江弘源襄阳碳化硅特种陶瓷有限责任公司 | Silicon nitride and silicon carbide combined ceramic filter and preparation method thereof |
| CN110981539A (en) * | 2019-12-30 | 2020-04-10 | 武汉科技大学 | Magnesium oxide based filter containing functional coating multi-pore structure and preparation method thereof |
| CN110981539B (en) * | 2019-12-30 | 2021-11-16 | 武汉科技大学 | Magnesium oxide based filter containing functional coating multi-pore structure and preparation method thereof |
| CN115066471A (en) * | 2020-01-31 | 2022-09-16 | 陶氏环球技术有限责任公司 | Coated polyurethane foam |
| CN115066471B (en) * | 2020-01-31 | 2023-12-29 | 陶氏环球技术有限责任公司 | Coated polyurethane foam |
| CN112759418A (en) * | 2021-01-08 | 2021-05-07 | 武汉科技大学 | Silicon nitride whisker reinforced corundum porous ceramic filter and preparation method thereof |
| CN113831074A (en) * | 2021-10-22 | 2021-12-24 | 武汉盛大长青建材有限公司 | Light sound-insulation terrace slurry containing polyurethane particles, preparation method and light sound-insulation terrace |
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