CN102989235A - Filter for filtering molten metals and manufacturing method thereof - Google Patents
Filter for filtering molten metals and manufacturing method thereof Download PDFInfo
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- CN102989235A CN102989235A CN2012105736756A CN201210573675A CN102989235A CN 102989235 A CN102989235 A CN 102989235A CN 2012105736756 A CN2012105736756 A CN 2012105736756A CN 201210573675 A CN201210573675 A CN 201210573675A CN 102989235 A CN102989235 A CN 102989235A
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Abstract
The invention relates to a foam filter for filtering molten metals. The foam filter comprises bonding materials and ceramic materials bonded together by the bonding materials, wherein the bonding materials comprise carbon substrates connected with network-shaped carbon; and part of the ceramic materials is spherical granular materials. The foam filter has the beneficial effects that the thermal shock resistance and high-temperature impact resistance of the molten metal filter are unexpectedly improved by introducing part of the ceramic materials in the form of spherical granules; in other aspects, the thermal shock resistance and compressive strength are further improved by optimizing formulas, grain sizes and the like; in particular, not only is the cost reduced but also the specific heat capacity of the product is reduced by introducing the high-proportion carbon component to the product; and the filter is easy to start for filtration and does not cause crystallization of the molten metals during starting easily.
Description
Technical field
The present invention relates to the manufacturing field of filter, more particularly, relate to a kind of filter for filtering molten metal and manufacture method thereof.
Background technology
The purification of molten metal plays an important role to the mechanical property that improves foundry goods.The filter that is used at present the molten metal purification is ceramic filter, can effectively intercept and capture the objectionable impurities in the molten metal and make molten metal become laminar flow by turbulent flow, plays purifying and the homogeneous effect.Ceramic filter can be divided into ceramic foam filter and straight-bore ceramic filter according to structure.The filter that is used at present cast steel almost all is ceramic foam filter.With in the middle of the foam filter, the highest with the requirement of foam filter for cast steel at all motlten metals, this is because the cast steel motlten metal has higher melt temperature.Under this temperature, filter need to keep enough mechanical strength, thermal shock resistance and lower specific heat capacity.Wherein, the factor that affects thermal shock resistance comprises thermal coefficient of expansion, thermal conductivity factor, material inherent strength, fracture toughness of material etc.Generally speaking, thermal coefficient of expansion is less, and material is little because of the change in volume that variations in temperature causes, the temperature stress of corresponding generation is little, and thermal shock resistance is better; Thermal conductivity is large, and the temperature difference of material internal is less, and the stress difference that is caused by the temperature difference is less, and thermal shock resistance is better; The material inherent strength is higher, bears thermal stress and the intensity of unlikely destruction is larger, good thermal shock.For ceramic material, the internal organizational structure of material and geometry also are influence factors.Generally speaking, material structure is relatively loose, and certain porosity is arranged, and has suitable micro-crack to exist, and can improve energy to failure, makes material unlikely destroyed under thermal shock.Therefore but material structure is relatively loose, also can reduce the mechanical strength of material, has easily contradiction between the mechanical strength of filter and thermal shock resistance.
The preparation of traditional foam filter that is used for cast steel depends on zirconia.For example CN200710139288.0 namely discloses a kind of Zirconium oxide foam ceramic filter.This is because zirconia has high mechanical strength, even adopt the foaming structure of porous, also can keep good mechanical performance, but, because zirconium is a kind of rare metal, although good filtration effect, its fancy price seriously limit its extensive use in cast steel and other high-temperature liquid metal filtration art, just be used for special steel or the steel of high added value or the casting of alloy.
CN201010511259.4 relates to a kind of yttria foamed ceramic filter and preparation method thereof, and is the same with the zirconium oxide filter, and its high cost is to use producer to be difficult to accept.
CN1449312A 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.This invention requires the firing atmosphere of controlled filter device, quality and level with control carbon-to-carbon bonding, namely when burning till beginning, in the combustion chamber, inject air, then the reasonable level of indoor oxygen stops to inject guaranteeing burning, this method is difficult to control in production, causes easily the unstable of product quality.In addition, if do not use zirconium in refractory material, burn till middle meeting and larger contraction occurs, the mechanical strength of product can reduce, and can not produce large filter, and larger oxidation is arranged in burning till.In addition, according to the preparation method of this patent, for satisfying the filtration needs of cast steel liquid, also must adopt zirconia, adopt other raw materials as ceramic material, the mechanical performance of prepared filter can not get requirement.
Summary of the invention
The objective of the invention is to propose the new technical scheme of a kind of thermal shock resistance for improvement of filter for molten metal and high temperature impact resistance.
Of the present invention general aspect, be used for the ceramic material that the foam filter of filtering molten metal comprises adhesives and bonded together by this adhesives, described adhesives comprises the carbon base body that network-like carbon connects, and a part is spherical granular material in the described ceramic material.
In concrete embodiment, described spherical particle material is main silicon oxide-containing, aluminium oxide, zirconia, titanium oxide, magnesia or contain the material of two kinds of these oxides.
As optimal way, the spherical material addition of silica is 1 ~ 10% of ceramic material gross weight.The usage ratio of the spherical ceramic material of other except silica can for the ceramic material gross weight 10 ~ 35% between.
In another embodiment of the invention, the raw materials of filter comprises the ceramic material of 25-44%, the carbon-rich material of 56-75%, described carbon-rich material comprises above-mentioned adhesives and DIC, and no more than 50% ceramic material is introduced with the spherical particle form.
Further, this DIC is graphite, and content is no more than 20% of filter gross weight.
As further preferred, this DIC is the mixture of graphite and carbon black, and wherein content of carbon black is no more than 10% of filter gross weight.
As an optimization formula of the present invention, raw materials mainly is comprised of following ingredients in mass parts: corundum, 10-18; Alumina powder, 10-18; Graphite, 6-15; Lignin, 15-25; Carbon black, 6-15; And rich carbon binding agent, 20-40.Wherein, the consumption of carbon black preferably is no more than the amount of graphite.More preferably 1/3 ~ 2/3 of quantity of graphite.
The invention still further relates to the method for above-mentioned filter, comprise the following steps: 1) will comprise ceramic material, adhesives and other compositions and be mixed with slurry with liquid-carrier; 2) slurry for preparing is coated with hang over and forms at least one deck refractory coating on the open cell porous material; The open cell porous material that 3) will form refractory coating randomly carries out impregnation process; 4) under reducing atmosphere, carry out sintering.
As optimal way, described impregnated material is one or more in resin, lignin, cellulose, pitch or the tar.
As further preferred, in step 2) and 3) between also comprise: drying is coated with the open cell porous material that hangs with refractory coating between 100-200 ℃.
The present invention has unexpectedly improved thermal shock resistance and the high temperature impact resistance of filter for molten metal by the part of ceramic material is introduced with the spheric granules form.In other aspects of the present invention, by prescription, particle diameter etc. having been carried out preferably further improved thermal shock resistance and compression strength.Especially by in product, having introduced a high proportion of carbon component, not only reduce cost, and reduced the specific heat capacity of product, be easy to start and filter, be difficult for causing the crystallization of motlten metal when starting.
The specific embodiment
Unless stated otherwise, this paper calculates when mentioning component ratio all by percentage to the quality.
In the present invention, can be any known refractory ceramic material in this area by the bonding ceramic material of adhesives, it provides filter desired to the corrosion function of motlten metal and the tolerance of high temperature.The example that is applicable to refractory ceramic material of the present invention comprises alumina, aluminium oxide, zirconium English powder, magnesia, mullite, aluminium oxide, zirconia, titanium oxide, fused alumina zirconia, based on zirconium corundum, mullite, schmigel, clay, pyrophillite, wollastonite, kyanite, sillimanite, carborundum, zirconium carbide, titanium carbide, calcium carbide, aluminium carbide, spinelle, A Long, magnesium A Long, Sialon, Sialon-carborundum, Sialon-corundum-carborundum, olivine, mullite etc.The particle diameter of these materials is usually below 200 orders, more preferably below 325 orders.
Characteristics of the present invention are, the refractory ceramic material of part is introduced with spherical particle.Introduce spherical particle, can improve thermal shock resistance and the high temperature impact resistance of product.Described high temperature impact resistance refers at high temperature the performance of the impact of (for example for the filtration of liquid steel device, for example under 1100 ℃) tolerance point molten metal.In typical embodiment, the spherical particle material is main silicon oxide-containing, aluminium oxide, zirconia, titanium oxide, magnesia or contain the material of two kinds of aforesaid oxides.The possible reason that above-mentioned spherical ceramic material has advantage is that spheroidal material has low-expansion coefficient, can improve the thermal shock resistance of product.Be beneficial to simultaneously the tightly packed of material in the product, product high temperature thermal-shock resistance is improved.In application examples of the present invention, the spherical material addition of silica is 1 ~ 10% based on the ceramic material gross weight, for example 5 ~ 8%.The inventor does not attempt adding more spherical silica, and this is owing to worry to add the softening temperature that too much silica can reduce filter inadequately.The usage ratio of other ceramic materials can for the ceramic material gross weight 10 ~ 35% between, for example between 15 ~ 30%, more for example between 20 ~ 25%.
Adhesives comprises carbon base body, and it bonds together refractory material.Adhesives is the form of coke or semi-coke preferably, and it obtains by under the no oxygen condition organic carbon-rich material being heated to 500 ~ 1100 ℃.
The scope of ceramic material and adhesives relative scale can be at least 50% refractory material, no more than 50% adhesives; In a kind of specific embodiment, use at least 55% refractory material, no more than 45% adhesives, at least 60% refractory material for example, no more than 40% adhesives.
In another embodiment of the invention, the raw materials that is used for the filter of filtering molten metal comprises the ceramic material of 25-44%, the carbon-rich material of 56-75%.Wherein, no more than 50% ceramic material is introduced with the spherical particle form.Carbon-rich material comprises above-mentioned adhesives and DIC.In a kind of specific embodiment, this DIC is graphite, and content is no more than 20% of filter gross weight; In another embodiment, graphite and carbon black are used have useful technique effect.Graphite has good heat conductivility, also has less density, good heat-resisting quantity and chemical stability, anti-erosion.But the granularity of graphite is larger, and the flowability of gained slurry is not good when using separately, and the present invention selects the less carbon black of particle diameter, and the graphite larger with granularity uses, and can be filled between the slit of graphite, is conducive to improve the being coated with property of slurry.Carbon black belongs to the amorphous carbon cellulosic material, and easy and metallic silicon reaction is difficult to dissolving in steel, can improve the microstructure of product, improves mechanical performance and high-temperature behavior.The Another reason of introducing carbon black is with carbon black Partial Replacement graphite, to the requirement of water, improves the rheological property of slurry in the time of can reducing the preparation slurry.
This high-carbon takes full advantage of the high refractoriness of material with carbon element, good thermal conductivity, low thermal coefficient of expansion, stable chemical nature and erosion resisting mutually, so that the product that makes has good thermal shock resistance, thermal-shock resistance, high performances such as rupture strength.The wide material sources of carbon are cheap simultaneously, can reduce the cost of material of filter.
In a kind of preferred embodiments of the present invention, filter is mainly made by corundum, alumina powder, graphite, carbon black, lignin and above-mentioned adhesives.With corundum and alumina powder collocation, be used to form the non-material with carbon element in the filter here.Corundum has high Mohs' hardness, gives the higher rigidity of filter and mechanical strength.But the inventor finds that use merely corundum, the being coated with property of the slurry that forms is relatively poor, is unfavorable for that namely slurry is coated with the surface of the foamed material of mentioning hereinafter.Mixing then obviously improves the being coated with property of slurry with alumina powder.The particle diameter of corundum is preferably below 325 orders, and the particle diameter of alumina powder is preferably 1-10 microns scope.Among the present invention, based on 100 parts of raw material total amounts (not comprising water), preferably introduce 10-18 part, the more preferably corundum of 13-16 part and 10-18 part, the more preferably alumina powder of 13-16 part.The inventor finds through great many of experiments, the introducing total amount of above-mentioned non-material with carbon element material is less than 40%, be not less than 20%, the mechanical strength that both can keep filter, also can control its weight and cost, the most important thing is to reduce the specific heat capacity of product, be conducive to the in use quick startup of molten metal.Corundum and aluminium oxide reasonably combined can improve the microstructure of product, the properties of Effective Raise product.
In aforementioned preferred embodiments, based on 100 parts of raw material total amounts (not comprising water), preferably introduce 6-15 part, the more preferably graphite of 8-13 part, preferably introduce 6-15 part, the more preferably carbon black of 8-13 part.As preferred version, the consumption of carbon black is no more than the amount of graphite, and preferably less than the consumption of graphite, for example, its consumption is 1/3 ~ 2/3 of quantity of graphite.The consumption of carbon black surpasses graphite, may the heat conductivility of filter be had a negative impact in some embodiments, finally reduces the thermal shock resistance of filter.
The particle diameter of the graphite that uses among the present invention below 200 orders, typically below 325 orders, like this, correspondingly uses particle diameter at the less carbon black of particle diameter usually.In the situation of using the graphite about average grain diameter 100 μ m, can use particle diameter is the carbon black of 10 ~ 50 μ m.In a specific embodiment of the present invention, used the graphite of average grain diameter at 50 ~ 70 μ m, correspondingly use particle diameter at the carbon black of 5 ~ 15 mu m ranges.The present invention more preferably uses content greater than 99.0%, and granularity is less than 10 microns carbon black.The inventor is surprised to find that, uses more short grained carbon black, and namely particle diameter is at 100 ~ 900nm, the more preferably carbon black between 100 ~ 500nm, and the thermal shock resistance of gained filter is enhanced.Be not wishing to be bound by theory, a possible reason is the heat conductivility that less particle size carbon black has improved filter.
In preferred embodiment of the present invention, in composition of raw materials, introduce metallic silicon power and/or aluminium powder.Metallic silicon is conducive to improve the non-oxidizability of product.Add a small amount of aluminium powder and can further improve cold crushing strength and the high temperature break resistant intensity of product.In addition, the silicon monoxide that metal A l/Si discharges, an aluminium oxide gas meet oxygen or carbon dioxide gas is known from experience reaction generation aluminium oxide and silica, is deposited on the surface of solids in the pore, stops up pore, is conducive to the raising of non-oxidizability.In the present invention, the introducing amount of silica flour and aluminium powder is aggregated between 1 ~ 5%.
Exist in the situation of metallic silicon, preferably comprise carbon black in carbon-rich material, the carbon black granularity is preferably less than 10 microns.Carbon black belongs to the amorphous carbon cellulosic material, and easy and metallic silicon reaction is difficult to dissolving in steel, can improve the microstructure of product, improves mechanical performance and high-temperature behavior.
Usually, above-mentioned each composition is mixed with liquid-carrier, form slurry.Employed liquid-carrier can water, methyl alcohol, ethanol, benzinum etc., and water is preferred in actual the use.Can also comprise other a small amount of auxiliary agents in the slurry, for example suspending agent, defoamer, wetting agent, dispersant, activating agent etc.These auxiliary agents are that prior art is known.
Next, the slurry for preparing is coated with hang over and forms at least one deck refractory coating on the foamed material.Foamed material is polyurethane foam for example, is used to filter that porous is provided, so that comprise the hole of irregular or random distribution in the filter of making, these holes are as the passage of motlten metal.Can all or part of intercommunication maybe can there be a plurality of passages in these holes, and motlten metal is passed through.
After being coated with, the foamed material that preferably will scribble slurry is dried, and the product after the oven dry carries out impregnation process.Described impregnation process refers to the base substrate with the drying in the weak solution dipping that contains resin, lignin, cellulose, pitch or tar.Mode as an alternative, this impregnation steps also can be carried out after sintering.By impregnation technology the goods open pore is reduced, carbon residue improves, thereby improves normal temperature/elevated temperature strength, thermal shock resistance and the thermal-shock resistance of product.For better improving dipping efficient, can adopt Special vacuum-pressure oil immersion equipment.Good product is put into container to be about to oven dry, and the covered container lid vacuumizes and injects impregnant and pressurize a period of time.
Next, carry out sintering under inert atmosphere or reducing atmosphere, sintering temperature is suitable to be controlled at 500 ℃ ~ 1100 ℃.Before sintering, drying is coated with the open cell porous material that hangs with refractory coating between 100-200 ℃ alternatively.
Embodiment 1
Add entry in aluminium powder, 1.5 wt % dispersants and the 1.5 wt % activating agents with the pitch of 38wt% zirconium mullite powder, 38 wt %, 20% spherical titanium oxide, 0.5% metallic silicon power and 0.5% and make slurry.
This slurry is used for applying 50*50*22, the 10PPI polyurethane foam of well cutting.Being coated with the foam that hangs up properly slurry, to carry out after the drying slurry with dilution dry again after spraying again, and dried product adopts about 170 ℃ pitch to flood under vacuum atmosphere, then carries out sintering under 950 ℃, gets sample.Sample is put into Muffle furnace 1100 ℃ of insulations 10 minutes, is placed on immediately after the taking-up in the water of normal temperature, carry out thermal shock resistance test, repeatedly operation, carry out 8 times after, the filter cracking.Cold crushing strength is 1.35Mpa.Carry out pouring experiment take 50kg, 1630 ℃, pouring head as the molten steel of 500mm, it is not damaged that test sample withstands cast.
Comparative example 1
Repeat embodiment 1, difference is that titanium oxide is the ordinary powder powder, and particle diameter is the powder of 1 ~ 4 μ m.After carrying out 6 thermal shock resistance tests, the filter cracking.Cold crushing strength is 1.03Mpa.
Embodiment 2
Spinel powder with 19%, 42% pitch, 35% schmigel (wherein half is sphere material), 3% Ludox, 0.5% metallic aluminium powder, 0.5% dispersant.With efficient blender powder and water are mixed and made into slurry, this slurry is used for applying 50*50*22,10PPI polyurethane foam.Being coated with the foam that hangs up properly, to carry out after the drying slurry with dilution dry again after being coated with once again, and then product adopts liquid phenolic resin to carry out impregnation process, carries out at last sintering under 1000 ℃, gets sample.With sample insulation 10 minutes in 1100 ℃ in Muffle furnace, be placed on immediately after the taking-up in the water of normal temperature, carry out thermal shock resistance test, repeatedly operation, carry out 8 times after, the filter cracking.Cold crushing strength is 2.20Mpa.Carry out pouring experiment at 1630 ℃ of lower 50 kilograms of molten steel, product does not have fragmentation, and pouring head is 650mm.
Comparative example 2
Repeat embodiment 2, difference is that schmigel is ordinary powder.Particle diameter is the powder of 1 ~ 4 μ m.After carrying out 3 thermal shock resistance tests, the filter cracking.Cold crushing strength is 1.55Mpa.Be 650mm at pouring head, 1630 ℃ of lower 50 kilograms of molten steel carry out pouring experiment, and product occurs local broken.
Embodiment 3
Sialon-carborundum powder with 27%, 18% graphite, 42.5% pitch, 10% spherical zircite, 2% active silica, 0.5% dispersant.Above-mentioned material and water are mixed and made into the slurry of certain viscosity with an efficient blender.The slurry of mixed system is used for applying 50*50*22,10PPI polyurethane foam.Be coated with the polyurethane foam that hangs up properly and carry out after the drying after the again slurry spraying once with dilution dryly again, then product adopts tar to carry out impregnation process, carry out sintering under 800 ℃ under oxygen-free atmosphere, gets sample.With sample insulation 10 minutes in 1100 ℃ in Muffle furnace, be placed on immediately after the taking-up in the water of normal temperature, carry out thermal shock resistance test, repeatedly operation, carry out 10 times after, the filter cracking.Cold crushing strength is 1.63Mpa.Carry out the pouring molten steel test under 1630 ℃, product does not have fragmentation.
Comparative example 3
Repeat embodiment 3, difference is that zirconia is ordinary powder, and particle diameter is 5 ~ 10 μ m.After carrying out 3 thermal shock resistance tests, the filter cracking.Cold crushing strength is 1.43Mpa.Carry out the pouring molten steel test under 1630 ℃, crackle appears in product.
Embodiment 4
Nanometer fused alumina zirconia powder with 20%, 19% ball-aluminium oxide powder, 15% graphite, 10% carbon black, 34% pitch, the mixture water of 1% metallic silicon power, 0.5% dispersant and 0.5% activating agent forms slurry.The slurry of mixed system is used for applying 50*50*22,10PPI polyurethane foam.Be coated with the polyurethane foam that hangs up properly and carry out after the drying after the again slurry spraying once with dilution dryly again, then product adopts tar to carry out impregnation process, carry out sintering under 800 ℃ under oxygen-free atmosphere, gets sample.With sample insulation 10 minutes in 1100 ℃ in Muffle furnace, be placed on immediately after the taking-up in the water of normal temperature, carry out thermal shock resistance test, repeatedly operation, carry out 12 times after, the filter cracking.Cold crushing strength is 2.10Mpa.Carry out the pouring molten steel test under 1630 ℃, product does not have fragmentation.
Comparative example 4
Repeat embodiment 4, difference is, uses common alumina powder, and particle diameter is 3 ~ 6 μ m.After sample carries out 5 thermal shock resistance tests, the filter cracking.Cold crushing strength is 1.82Mpa.Carry out the pouring molten steel test under 1630 ℃, product is local broken.
Embodiment 5
Wherein half is spheric granules to adopt nanometer pyrophillite 40%(), graphite 15%, pitch 40%, Ludox 2%, polyvinyl alcohol 1%, spherical molten silicon micro mist 4%, in a high speed mixer, add successively above-mentioned powder and water is made slurry, then be coated with on the polyurethane sponge that is hung on 50*50*22,10PPI dry, sintering under 900 ℃ of oxygen-free atmospheres gets sample at last.With sample insulation 10 minutes in 1100 ℃ in Muffle furnace, be placed on immediately after the taking-up in the water of normal temperature, carry out thermal shock resistance test, repeatedly operation, carry out 6 times after, the filter cracking.Cold crushing strength is 1.35Mpa.Carry out the pouring molten steel test under 1630 ℃, product does not have fragmentation.
Comparative example 5
Repeat embodiment 5, difference is that pyrophillite is ordinary powder, and particle diameter is 2 ~ 10 μ m.After carrying out 3 thermal shock resistance tests, the filter cracking.Cold crushing strength is 1.02Mpa.Carry out the pouring molten steel test under 1630 ℃, product occurs broken.
Embodiment 6-13
By table 1 be the prescription make the filter that is of a size of 50*50*15mm, the gained filter is tested, test result sees Table 2.
In the table 2, cold crushing strength is to record according to GB/T25139-2010, the mechanical strength of reflection filter.Cold crushing strength is higher, and filter is cracky more not in transportation and use procedure.In addition, as a rule, cold crushing strength is higher, and the crushing strength under high temperature of filter can be higher.The specific heat capacity of density reflection filter.Density is less, and the heat that filter absorbs when the filter motlten metal can be less, and the possibility that motlten metal solidifies can be less.
Table 1 embodiment 6-13 raw material proportioning table
| Embodiment | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 |
| Corundum | 11 | 18 | 15 | 28 | — | 15 | 15 | 15 |
| Alumina powder | 17 | 17 | 15 | — | 35 | 15 | 15 | 15 |
| Graphite | 7 | 14 | 13 | 7 | 7 | 20 | — | 23 |
| Carbon black | 7 | 10 | 7 | 7 | 7 | — | 20 | 17 |
| Lignin | 22 | 18 | 20 | 22 | 22 | 20 | 20 | — |
| Binding agent | 36 | 23 | 30 | 36 | 36 | 30 | 30 | 30 |
In the table 1, the particle diameter of corundum is 325 orders; The particle diameter of alumina powder is 2-5 microns; The particle diameter of graphite is 270 orders; The particle diameter of carbon black is 100 ~ 500nm.
The test result of table 2 embodiment 6-13 gained filter
| Embodiment | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 |
| Cold crushing strength (Mpa) | 1.34 | 1.23 | 1.69 | 1.09 | 1.21 | 0.99 | 1.02 | 1.10 |
| Density g/cm 3 | 0.46 | 0.47 | 0.45 | 0.44 | 0.44 | 0.41 | 0.43 | 0.42 |
| Cast test (1630 ℃) | By | By | By | By | By | Do not pass through | Do not pass through | Do not pass through |
Although disclose herein with typical raw material and typical preparation method and prepare some samples, and obtained Expected Results, but those skilled in the art can expect, adopt other raw material also may prepare product of the present invention, even obtained and be better than technique effect of the present invention, these all are encompassed within claims limited range.
Claims (20)
1. foam filter that is used for filtering molten metal, the ceramic material that comprises adhesives and bonded together by this adhesives, described adhesives comprise the carbon base body that network-like carbon connects, and a part is spherical granular material in the described ceramic material.
2. filter as claimed in claim 1, described ceramic material are to be selected from alumina, aluminium oxide, zirconium English powder, magnesia, zirconium mullite, aluminium oxide, zirconia, titanium oxide, fused alumina zirconia, based on zirconium corundum, mullite, schmigel, clay, pyrophillite, wollastonite, kyanite, sillimanite, spinelle, A Long, magnesium A Long, Sialon, Sialon-carborundum, Sialon-corundum-carborundum and the olivine one or more.
3. filter as claimed in claim 1, wherein, described spherical particle material is main silicon oxide-containing, aluminium oxide, zirconia, titanium oxide, magnesia or contain the material of two kinds of these oxides.
4. filter as claimed in claim 3, wherein, the spherical material addition of silica is 1 ~ 10% of ceramic material gross weight.
5. filter as claimed in claim 3, wherein, the usage ratio of the spherical ceramic material of other except silica be the ceramic material gross weight 10 ~ 35% between.
6. filter as claimed in claim 1, wherein, described adhesives is heated to 500-1100 ℃ by one or more of pitch, tar and rich carbon resin and forms under oxygen free condition.
7. filter as claimed in claim 1, wherein, the raw materials of filter comprises the carbon-rich material of the ceramic material of 25-44%, 56-75%, and described carbon-rich material comprises above-mentioned adhesives and DIC, and no more than 50% ceramic material is introduced with the spherical particle form.
8. filter as claimed in claim 7, wherein, this DIC is graphite, content is no more than 20% of filter gross weight.
9. filter as claimed in claim 7, wherein, this DIC is the mixture of graphite and carbon black, wherein content of carbon black is no more than 10% of filter gross weight.
10. filter as claimed in claim 7, wherein, raw materials mainly is comprised of following ingredients in mass parts:
Corundum, 10-18;
Alumina powder, 10-18;
Graphite, 6-15;
Lignin, 15-25;
Carbon black, 6-15;
Rich carbon binding agent, 20-40.
11. filter as claimed in claim 10 is characterized in that, the consumption of carbon black is no more than the amount of graphite.
12. filter as claimed in claim 11 is characterized in that, the consumption of carbon black is 1/3 ~ 2/3 of quantity of graphite.
13. filter as claimed in claim 10 is characterized in that, the particle diameter of carbon black is less than 10 microns.
14. filter as claimed in claim 13 is characterized in that, the particle diameter of carbon black is between 100 ~ 900nm.
15. filter as claimed in claim 14 is characterized in that, the particle diameter of carbon black is between 100 ~ 500nm.
16. such as each described filter of claim 7 to 15, further comprise 1 ~ 5% silica flour and/or aluminium powder.
17. filter as claimed in claim 16 wherein, comprises carbon black in carbon-rich material, the carbon black granularity is less than 10 microns.
18. the method for the production of each described filter of claim 1 to 15 comprises the following steps:
1) will comprise ceramic material, adhesives and other compositions and be mixed with slurry with liquid-carrier;
2) slurry for preparing is coated with hang over and forms at least one deck refractory coating on the open cell porous material;
The open cell porous material that 3) will form refractory coating randomly carries out impregnation process,
4) under reducing atmosphere, carry out sintering.
19. method as claimed in claim 18, wherein, described impregnated material is one or more in resin, lignin, cellulose, pitch or the tar.
20. method according to claim 19 is wherein, in step 2) and 3) between also comprise: the dry open cell porous material that hangs with refractory coating that is coated with between 100-200 ℃.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105727756A (en) * | 2014-12-09 | 2016-07-06 | 中国科学院金属研究所 | Dual-gradient pore-structure sialon and silicon carbide combined membrane tube and preparation method thereof |
| CN107522496A (en) * | 2017-06-15 | 2017-12-29 | 上海极率科技有限公司 | The preparation method of composite ceramic-based high temperature filtration diaphragm |
| CN111205072A (en) * | 2020-02-27 | 2020-05-29 | 辽宁科技大学 | Preparation method of 3D printing magnesium-aluminum molten metal filtering device |
| CN112692238A (en) * | 2020-12-18 | 2021-04-23 | 东北大学 | Method for filtering inclusions in steel by honeycomb ceramic under action of external electric field |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105727756A (en) * | 2014-12-09 | 2016-07-06 | 中国科学院金属研究所 | Dual-gradient pore-structure sialon and silicon carbide combined membrane tube and preparation method thereof |
| CN105727756B (en) * | 2014-12-09 | 2018-11-06 | 中国科学院金属研究所 | A kind of pair of gradient pore structured Sialon silicon carbide membrane tube and preparation method thereof |
| CN107522496A (en) * | 2017-06-15 | 2017-12-29 | 上海极率科技有限公司 | The preparation method of composite ceramic-based high temperature filtration diaphragm |
| CN111205072A (en) * | 2020-02-27 | 2020-05-29 | 辽宁科技大学 | Preparation method of 3D printing magnesium-aluminum molten metal filtering device |
| CN112692238A (en) * | 2020-12-18 | 2021-04-23 | 东北大学 | Method for filtering inclusions in steel by honeycomb ceramic under action of external electric field |
| CN112692238B (en) * | 2020-12-18 | 2021-09-21 | 东北大学 | Method for filtering inclusions in steel by honeycomb ceramic under action of external electric field |
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