CN101810972B - Filter for filtering molten metal and manufacturing method thereof - Google Patents
Filter for filtering molten metal and manufacturing method thereof Download PDFInfo
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- CN101810972B CN101810972B CN2010101515914A CN201010151591A CN101810972B CN 101810972 B CN101810972 B CN 101810972B CN 2010101515914 A CN2010101515914 A CN 2010101515914A CN 201010151591 A CN201010151591 A CN 201010151591A CN 101810972 B CN101810972 B CN 101810972B
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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
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Abstract
The invention discloses a filter for filtering molten metal, which comprises an open porous material, adhesive and ceramic powder, wherein the ceramic powder is stuck to the open porous material through the adhesive. The mechanical property of the filter is greatly enhanced and the high temperature resistance of the filter is improved by increasing the component and content of the adhesive in the filter and combining the use of the ceramic powder, so the filter can filter the molten metal at harsh temperature; and the mechanical properties such as tensile strength, elongation rate and the like of castings filtered by the filter are obviously improved. In addition, the components selected and used in the production of the filter are economic, and the filter is easy to realize in the production process, so the manufacture of the filter is more economic.
Description
Technical field
The present invention relates to the manufacture field of filter, more particularly, relate to a kind of filter for filtering molten metal and manufacture method thereof.
Background technology
At present, United States Patent (USP) 5104540 (CORNING company) has shown a kind of carbon for filtering molten metal and has applied the porous sintered ceramic filter, comprise the monolithic base-material formed from refractory material, as aluminium oxide, mullite, zirconium English powder, zirconia, spinelle, cordierite, lithium, alumina silicate, titanate, feldspar, quartz, gaseous oxidation silicon, carborundum, kaolin, aluminium titanates, silicate, aluminate and their mixture.Carbon-base coating is applied to the screen pack surface or is used as scorching hot coating and uses.
US5520823 is a filter for the filtering molten aluminum metal.Adhesive adopts borosilicate glass.Although this filter comprises graphite, because the graphite of sintering a great deal of in air has lost.The carbon lost has limited the use of filter, and making it can only be for the aluminum filtration metal, and can not be for molten iron and steel metal filtration.
W00218075 has announced a kind of filter for filtering molten metal, and filter comprises open cell porous material, and this material has comprised and the adhesive bonds that contains carbon structure refractory particles together.Namely in this filter, there is no other mechanism of attachment except carbon binder.
As everyone knows, can improve the fire resistance that is directed to motlten metal with carbon.The refractory material that contains carbon can withstand the temperature that motlten metal is higher, and prevent metal penetration, at high temperature very high intensity arranged, and better anti-thermal shock effect.Yet at room temperature intensity is very low for the filter of carbon binder bonding, its easy moisture absorption, affect product use at high temperature simultaneously.
Summary of the invention
In view of this, the invention provides a kind of filter for filtering molten metal and manufacture method thereof, to improve filter normal temperature mechanical performance and high temperature strength.
For achieving the above object, the invention provides following technical scheme:
A kind of filter for filtering molten metal comprises: open cell porous material, binding agent and ceramic powder, described ceramic powder is bonded on described open cell porous material by described binding agent.
Preferably, in above-mentioned filter, described ceramic powder comprises: one or more in zirconium mullite, mullite, schmigel, clay, pyrophillite, wollastonite, kyanite, sillimanite, spinelle or olivine.
Preferably, in above-mentioned filter, described binding agent comprises: one or more in carbon black, graphite, carbon, pitch, tar, synthetic asphalts, synthetic resin, natural resin, anthracite, aluminium dihydrogen phosphate, aluminium colloidal sol, Alusil, Ludox, PVA, white glue with vinyl, dextrin, starch, CMC or MC.
Preferably, in above-mentioned filter, described binding agent and described ceramic powder part by weight are at least 50% binding agent: no more than 50% ceramic powder.
Preferably, in above-mentioned filter, described binding agent and described ceramic powder part by weight are 50%～70% binding agent: 30%～50% ceramic powder.
The invention also discloses a kind of manufacture method of the filter for filtering molten metal, comprising:
Ceramic powder, binding agent, additive and liquid-carrier are mixed with to slurry;
The slurry prepared is coated with to hang on open cell porous material and forms one deck refractory coating at least;
The open cell porous material that forms refractory coating is carried out to sintering under sintering temperature.
Preferably, in said method, the gross weight of described ceramic powder, binding agent and dispersant and the part by weight of liquid-carrier are at least: 70%:30%.
Preferably, in said method, the content of described ceramic powder, binding agent and dispersant is:
The ceramic powder of 20～45wt%;
The binding agent of 52～78wt%;
The additive of 1～9wt%.
Preferably, in said method, described liquid-carrier is water.
Preferably, in said method, described open cell porous material is the reticulated, open polyurethane foam.
Preferably, in said method, described sintering temperature is no more than 1150 ℃.
Preferably, in said method, also comprise before in step " open cell porous material that will form refractory coating is carrying out sintering under sintering temperature ": the dry open cell porous material that forms refractory coating between 100-200 ℃.
Preferably, in said method, described ceramic powder comprises: one or more in zirconium mullite, mullite, schmigel, clay, pyrophillite, wollastonite, kyanite, sillimanite, spinelle or olivine.
Preferably, in said method, described binding agent comprises: one or more in carbon black, graphite, carbon, pitch, tar, synthetic asphalts, synthetic resin, natural resin, anthracite, aluminium dihydrogen phosphate, aluminium colloidal sol, Alusil, Ludox, PVA, white glue with vinyl, dextrin, starch, CMC or MC.
Preferably, in said method, described binding agent and described ceramic powder part by weight are at least 50% binding agent: no more than 50% ceramic powder.
Preferably, in said method, described binding agent and described ceramic powder part by weight are 50%～70% binding agent: 30%～50% ceramic powder.
In above-mentioned filter, pass through to increase component and the content of binding agent, in conjunction with ceramic powder, make the mechanical performance of filter greatly strengthen, increased the resistance to elevated temperatures of filter, therefore this filter can filter the motlten metal of harsh temperatures, and the mechanical performances such as its tensile strength of the foundry goods be filtered, percentage elongation all obviously improve.In addition, the Component comparison economy of selecting in filter production, and than being easier to, realize in process of production, so this filter making is more economical.
The specific embodiment
Below the noun be designed into is made an explanation:
PVA: English full name: polyvinyl alcohol; Chinese full name: polyvinyl alcohol.
CMC: English full name: Carboxyl methyl Cellulose; Chinese full name: sodium carboxymethylcellulose.
MC: methylcellulose.
Open cell porous material: refer to a kind of hole that comprises rule, regular, the irregular or random distribution of part in solid material, these holes are the passage of motlten metal.Can all or part of interactive exchange maybe can there be a plurality of passages in these holes, and motlten metal is passed through.The size in hole own and shape can be rules or irregular.For example, this solid material can linearity be passed by the passage of series of parallel in these holes, and these passages have the cross section of any needs, for example, and circular, ellipse, triangle interconnecting channel etc., the poroid distribution similar to natural foam.First-selected open cell porous material is the reticulated, open polyurethane foam that has relative regular distribution can business bought.As everyone knows, such material can be used to the refractory material filter manufacturer of filtering molten metal.
Below the technical scheme in the embodiment of the present invention is clearly and completely described, obviously, described embodiment is only the present invention's part embodiment, rather than whole embodiment.Based on the embodiment in the present invention, those of ordinary skills, not making under the creative work prerequisite the every other embodiment obtained, belong to the scope of protection of the invention.
The embodiment of the invention discloses a kind of filter for filtering molten metal and manufacture method thereof, to improve the mechanical performance of filter resistance to elevated temperatures and filter.
For achieving the above object, the embodiment of the present invention adopts following technical scheme, in the present invention the refractory composition of filter is made to main change compared to prior art, and its corresponding production method is made corresponding improvement.
A kind of filter for filtering molten metal comprises: open cell porous material, binding agent and ceramic powder, ceramic powder is bonded on open cell porous material by binding agent.
Above-mentioned ceramic powder mainly is selected from: one or more in zirconium mullite, mullite, schmigel, clay, pyrophillite, wollastonite, kyanite, sillimanite, spinelle or olivine.
Wherein, binding agent is divided into carbonaceous material and binding material, both main functions exactly be used to the ceramic powder that bonds at open cell porous material, carbonaceous material mainly is selected from: carbon black, graphite, carbon, pitch, tar, synthetic asphalts, synthetic resin, natural resin or anthracite; And binding material mainly is selected from one or more in aluminium dihydrogen phosphate, aluminium colloidal sol, Alusil, Ludox, PVA, white glue with vinyl, dextrin, starch, CMC or MC.
Binding agent and ceramic powder part by weight are at least 50% binding agent: no more than 50% ceramic powder.More preferably, binding agent and ceramic powder part by weight are 50%～70% binding agent: 30%～50% ceramic powder.
The invention also discloses a kind of manufacture method of the filter for filtering molten metal, comprising:
Ceramic powder, binding agent, additive and liquid-carrier are mixed with to slurry;
The slurry prepared is coated with to hang on open cell porous material and forms one deck refractory coating at least;
The open cell porous material that forms refractory coating is carried out to sintering under sintering temperature.
Wherein, the part by weight of the gross weight of ceramic powder, binding agent and dispersant and liquid-carrier is at least: 70%: 30%; Preferably be at least: 75%: 25%; It is more preferably 80%: 20%.
The content of ceramic powder, binding agent and dispersant is respectively:
The ceramic powder of 20～45wt%;
The binding agent of 52～78wt%;
The additive of 1～9wt%.
Additive is mainly dispersant and activating agent, and wherein liquid-carrier is water, can also be methyl alcohol or ethanol.
Before sintering, also comprising: the dry open cell porous material that hangs with refractory coating that is coated with between 100-200 ℃.
During sintering, sintering temperature is no more than 1150 ℃, more preferably is no more than 1100 ℃.The sintering environment is to carry out under oxygen deficient atmospheres, such as in the oxygen-free atmospheres such as nitrogen, argon, vacuum, or in " reducing atmosphere ", in hydrogen and/or carbon monoxide, coal gas.Sintering is generally to carry out in a drying oven or kiln, but also can use the thermal source of other form to carry out sintering, as carries out the microwave of wireless frequency heating.
Ceramic powder comprises: one or more in zirconium mullite, mullite, schmigel, clay, pyrophillite, wollastonite, kyanite, sillimanite, spinelle or olivine.
Binding agent comprises: one or more in carbon black, graphite, carbon, pitch, tar, synthetic asphalts, synthetic resin, natural resin, anthracite, aluminium dihydrogen phosphate, aluminium colloidal sol, Alusil, Ludox, PVA, white glue with vinyl, dextrin, starch, CMC or MC.
Binding agent and ceramic powder part by weight are at least 50% binding agent: no more than 50% ceramic powder.Preferred binding agent and ceramic powder part by weight are 50%～70% binding agent: 30%～50% ceramic powder.
Ceramic powder and material with carbon element particle size can be less than 50 μ M, more preferably are less than 30 μ M, even are less than 20 μ M.
Embodiment mono-
To in 45wt% schmigel, 50wt% carbon, 2wt% aluminum silica gel, 1.5wt% dispersant and 1.5wt% activating agent, add water to make slurry.Wherein the part by weight of the gross weight of schmigel, carbon, aluminum silica gel, dispersant and activating agent and water is: 100%: 12%.
This slurry is used for applying to the polyurethane foam of well cutting.It is dry again after spraying that the foam that painting hangs up properly slurry carries out after drying slurry with dilution again, then under 950 ℃, carries out sintering.
Embodiment bis-
In 29% spinel powder, 56% carbon, 12% Ludox, 2.5% dispersant and 0.5% activating agent, add water to form slurry.Wherein spinel powder, carbon, Ludox, dispersant and the gross weight of activating agent and the part by weight of water be: 100%: 18%.
Slurry is mixed and made into powder and water with an efficient blender, and this slurry is used for applying polyurethane foam.It is dry again after being coated with once that the foam that painting hangs up properly carries out after drying slurry with dilution again, under 1100 ℃, carries out sintering.
Embodiment tri-
In 30% mullite powder, 47% carbon, 20% high softening point bitumen, 2% polyvinyl alcohol, 2% dispersant and 1.0% activating agent, add water.Wherein mullite powder carbon, high softening point bitumen, polyvinyl alcohol, dispersant and the gross weight of activating agent and the part by weight of water be: 100%: 20%.
Slurry is mixed and made into mullite powder, carbon, high softening point bitumen, polyvinyl alcohol and water with an efficient blender.The slurry of mixed system is used for applying polyurethane foam.After the polyurethane foam that painting hangs up properly was carried out drying, the slurry of use dilution was dry again after spraying once again, under 1150 ℃, was carrying out sintering under oxygen-free atmosphere.
Embodiment tetra-
40% electrofused mullite powder, 20% schmigel, 20% flake graphite in powder, 10% amorphous graphite 4% carboxymethyl cellulose, 0.5% dispersant and 0.5% activating agent, add water in above-mentioned powder.Wherein the part by weight of refractory material and water is: 100%: 22%.Slurry is mixed and made into various powders and water with an efficient blender.The slurry of mixed system is used for the molded polyurethanes foam.After the polyurethane foam of forming was carried out drying, the slurry of use dilution was dry under 120 ℃ of left and right again after spraying once again, under 1120 ℃, was carrying out sintering under oxygen-free atmosphere.
Binding agent and ceramic powders different in filter filter front and back performance comparison table to foundry goods:
The filter size of making by above-mentioned four kinds of formulas is 50*50*15mm, under 1650 ℃, has filtered the 50kgZG45 molten steel, and result is that this filter has withstood this testing conditions, and on request molten steel is filtered.By the detection to foundry goods after filtering, find, foundry goods tensile strength, percentage elongation, institutional framework have had obvious improvement: the tensile strength increase rate is at 4.0-7.5%, and percentage elongation improves at 9.5-15.0%; The foundry goods metallographic structure is greatly improved, and before and after filtering, matrix is all ferrite and pearlite, and the ferrite after filtering in tissue obviously attenuates, and this is conducive to performance and improves.By foundry goods fracture before and after filtering is carried out to ESEM micro-analysis discovery, not filtering the foundry goods fracture has sulphide inculsion, and after adopting filter to filter, finds that the foundry goods fracture is without field trash.
To the above-mentioned explanation of the disclosed embodiments, make professional and technical personnel in the field can realize or use the present invention.Multiple modification to these embodiment will be apparent for those skilled in the art, and General Principle as defined herein can be in the situation that do not break away from the spirit or scope of the present invention, realization in other embodiments.Therefore, the present invention will can not be restricted to these embodiment shown in this article, but will meet the widest scope consistent with principle disclosed herein and features of novelty.
Claims (6)
1. filter for filtering molten metal, it is characterized in that, raw materials comprises open cell porous material, binding agent, ceramic powder and additive, described ceramic powder is bonded on open cell porous material and forms by a firing by described binding agent, wherein, the proportioning of binding agent, ceramic powder and additive is:
The ceramic powder of 20～45wt%;
The binding agent of 52～78wt%;
The additive of 1～9wt%;
Described binding agent comprises at least a composition that is selected from the group that pitch, tar, synthetic asphalts, synthetic resin and natural resin form or multiple and be selected from one or more in the group that aluminium dihydrogen phosphate, aluminium colloidal sol, Alusil, Ludox, PVA, white glue with vinyl, dextrin, starch, CMC and MC form, and described ceramic powder is one or more in zirconium mullite, mullite, schmigel, clay, kyanite, sillimanite, spinelle or olivine.
2. the manufacture method for the filter of filtering molten metal, is characterized in that, comprising:
Ceramic powder by 20wt%～45wt%, the binding agent of 52wt%～78wt% and the additive of 1～9wt% and liquid-carrier are mixed with slurry, wherein, described binding agent comprises and is selected from pitch, tar, synthetic asphalts, synthetic resin, at least a composition in the group of natural resin and formation or multiple and be selected from aluminium dihydrogen phosphate, aluminium colloidal sol, Alusil, Ludox, PVA, white glue with vinyl, dextrin, starch, one or more in the group that CMC and MC form, described ceramic powder is zirconium mullite, mullite, schmigel, clay, kyanite, sillimanite, one or more in spinelle or olivine,
The slurry prepared is coated with to hang on open cell porous material and forms one deck refractory coating at least;
The open cell porous material that forms refractory coating is carried out to sintering under sintering temperature.
3. method according to claim 2, is characterized in that, described liquid-carrier is water.
4. method according to claim 3, is characterized in that, described open cell porous material is the reticulated, open polyurethane foam.
5. method according to claim 4, is characterized in that, described sintering temperature is no more than 1150 ℃.
6. method according to claim 5, is characterized in that, also comprises before in step " open cell porous material that will form refractory coating is carrying out sintering under sintering temperature ": the dry open cell porous material that hangs with refractory coating that is coated with between 100-200 ℃.
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| CN104128599A (en) * | 2014-08-14 | 2014-11-05 | 济南圣泉倍进陶瓷过滤器有限公司 | Molten metal filtering device |
| CN104587748B (en) * | 2015-01-29 | 2016-04-13 | 慈溪市天泉电器科技有限公司 | For removing the filter medium of Arsenic in Drinking Water, filter core and preparation method |
| CN106588098B (en) * | 2017-01-09 | 2019-06-25 | 武汉科技大学 | A kind of diffusion-type corundum-spinel air brick and preparation method thereof |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1449312A (en) * | 2000-08-31 | 2003-10-15 | 福塞科国际有限公司 | Refractory articles |
| CN101257957A (en) * | 2005-09-05 | 2008-09-03 | 维苏维尤斯·克鲁斯布公司 | Filter device for molten metal filtration and method for producing such filters |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1449312A (en) * | 2000-08-31 | 2003-10-15 | 福塞科国际有限公司 | Refractory articles |
| CN101257957A (en) * | 2005-09-05 | 2008-09-03 | 维苏维尤斯·克鲁斯布公司 | Filter device for molten metal filtration and method for producing such filters |
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