CN1830911A - Method for preparing moulding used foam ceramic filter - Google Patents
Method for preparing moulding used foam ceramic filter Download PDFInfo
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- CN1830911A CN1830911A CN 200610017435 CN200610017435A CN1830911A CN 1830911 A CN1830911 A CN 1830911A CN 200610017435 CN200610017435 CN 200610017435 CN 200610017435 A CN200610017435 A CN 200610017435A CN 1830911 A CN1830911 A CN 1830911A
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- sic
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Abstract
A foam ceramic filter used for casting is prepared from reticular polyurethane foam plastic through surface activating by polyvinylimine solution, immersing in the slurry prepared from SiC and dextrin or the mixture of dextrin and Si sol, centrifugally removing slurry, drying and calcining at 1400-1500 deg.C.
Description
Technical field
The present invention relates to the ceramic foam filter technology, mainly is the preparation method who proposes a kind of moulding used foam ceramic filter.
Technical background
The pore that produces in slag inclusion in the metal melting process and the casting cycle occupies larger specific gravity in casting defect.In Foundry Production, the casting wasted product rate that is caused by non-metallic inclusion adopts strainer filtering metal liquid then can reduce the waste product that slag and impurity are brought into significantly generally up to 50%～60% of waste product sum.Casting strainer commonly used has: cloth shape screen filter, common porous ceramic filter and ceramic foam filter, wherein the filter effect of ceramic foam filter is best.Adopt ceramic foam filter filtering metal liquid can reduce the waste product that 60%～80% slag and impurity are brought into, simultaneously, pass through filtering foundry goods mechanical property and cutting ability and improve significantly.
At present, abroad, the company of more existing developed countries is engaged in the production of casting with porcelain filter, as Consolidated Aluminum company, Hi-Teeh company, Bridgestone Co., Ltd. of Japan, the Foseco company of Britain and the Drachc pottery company of Germany etc. of the U.S..The high, medium and low melting point metals that these companies produced is produced the needs except that satisfying this country with porcelain filter, also occupies the bigger market share in China, its good product quality, but cost an arm and a leg.
Some manufacturer production porcelain filters are also arranged at home, and its price is lower than imported product, can satisfy the part domestic market demand, but product ubiquity quality instability, and intensity is low, easily fall the defective of slag, high temperature stability performance difference.
The preparation technology of ceramic foam filter has: foam impregnation technology, foam process, interpolation pore-forming material technology etc.Wherein foam impregnation technology is a kind of effective technology of the high porosity porous pottery of preparation, porous ceramics with this method preparation has the three-dimensional netted skeleton structure of perforate, this structure makes it have remarkable advantage as filtering material: when (1) passed through fluid, the pressure-losses was little; (2) the big and fluid contact efficiency height of surface-area; (3) in light weight.
Summary of the invention
The preparation method who the purpose of this invention is to provide a kind of moulding used foam ceramic filter uses the ceramic foam filter of this method preparation to have characteristics such as mechanical property is good, high temperature resistant, and has good high temperature metal solution through ability.
The preparation method of the moulding used foam ceramic filter that the present invention proposes is to be in the slurry of main component with SiC by reticulated polyurethane foam, make base substrate through flooding, get rid of slurry, and drying and 1400～1500 ℃ of high-temperature firings form, described reticulated polyurethane foam is earlier through surface activation process, is to carry out soaking paste again after 1%～4% polyethyleneimine: amine aqueous solution carries out surface activation process through concentration promptly; Described is that its binding agent of slurry of main component is the mixture that dextrin or dextrin and silicon sol are formed with SiC; Wherein in the mixture the shared weight percent of silicon sol less than 85%; Weight of binder be in the slurry SiC weight 5%～20%.
Described is that the slurry of main component is by SiC, α-Al with SiC
2O
3, clay, water and binding agent form, slurry is a benchmark with SiC weight, α-Al
2O
3Content be 8%～12% of SiC, the content of clay is 3%～5% of SiC.
The purity of used SiC powder is higher than 96%, wherein impurity F e
2O
3Content is lower than 1%.
The base substrate of described ceramic foam filter gets rid of slurry by whizzer and removes unnecessary slurry and make.
By the moulding used foam ceramic filter porosity of the inventive method preparation 80%～85%; Its ultimate compression strength is not less than 1.2MPa; Unit weight is at 0.5～0.65g/cm
3And its anti-thermal shock stability is very high, and 1100 ℃～20 ℃ water-cooleds are greater than 20 times.
Compare with similar products at home and abroad, its result is as follows:
| Homemade porcelain filter | The import porcelain filter | The porcelain filter of development | |
| Maximum operation (service) temperature | 1500℃ | 1500℃ | 1500℃ |
| Porosity | 80％～85％ | 80％～90％ | 80％～85％ |
| Unit weight | 0.5～0.65g/cm3 | 0.45～0.65g/cm3 | 0.5～0.65g/cm3 |
| Ultimate compression strength | 0.8MPa | 1.6MPa | 1.2MPa |
| Anti-thermal shock stability | 1100 ℃～20 ℃ water-cooleds are not split for 6 times | 1100 ℃～20 ℃ water-cooleds are not split for 20 times | 1100 ℃～20 ℃ water-cooleds are not split for 20 times |
Embodiment
The high temperature moulding used foam ceramic filter that the present invention relates to, do in the slurry of binding agent being mixed with the mixture that dextrin or dextrin and silicon sol form by the reticulated polyurethane foam after the surface activation process, through dipping, get rid of slurry and make base substrate, and drying and 1400～1500 ℃ of high-temperature firings form.
The preparation of polyethyleneimine: amine aqueous solution: selected definite ratio difference weighing water and polymine in 1%～4% proportional range, water is placed appropriate containers such as beaker, add polymine while stirring, make its abundant dispersing and dissolving, form colorless viscous liquid.
Reticulated polyurethane foam has tridimensional network, and through-hole rate is greater than 90%.
The surface activation process of reticulated polyurethane foam: the reticulated polyurethane foam water of definite shape size (requirement according to casting technique is determined) is cleaned up, immerse in the polyethyleneimine: amine aqueous solution for preparing behind the airing, fully soak into, extrude unnecessary polyethyleneimine: amine aqueous solution, blow away and be attached on the inside and outside formed liquid film in porous plastics aperture, and dry.
Used binding agent is the mixture of dextrin or dextrin and silicon sol composition in the slurry, and wherein the shared weight percentage of silicon sol is no more than 85% in the mixture; Weight of binder be in the slurry SiC weight 5%～20%.And the purity of used SiC powder is not less than 96%, wherein impurity F e
2O
3Content should be lower than 1%, and the chemical constitution thing of actual slurry is SiC, α-Al
2O
3, clay, water and binding agent, be benchmark content wherein with SiC content, α-Al
2O
3Content be its 8%～12%, the content of clay is its 3%～5%, binder content is its 5%～20%.Used SiC, α-Al
2O
3The granularity of powder is not higher than 60 microns.
The preparation of slurry: a certain amount of water is added in the container of agitator, add binding agent while stirring and make its homodisperse, then with clay, α-Al
2O
3, SiC adds in the container successively by consumption is ascending, makes slurry through fully stirring.
This high temperature moulding used foam ceramic filter needs the reticulated polyurethane foam behind the surface active is immersed in the slurry for preparing when making, and makes its surface adhesion slurry; Thereby get rid of slurry through whizzer and remove unnecessary slurry formation base substrate; Base substrate is dry under 110 ℃, gets rid of moisture; Dried base substrate burns till through 1400 ℃～1500 ℃ high temperature, because action of high temperature is all volatilized the organism in reticulated polyurethane foam and the slurry, forms the three-dimensional reticulated structure that connects.
Embodiment 1:
The surface activation process of A, urethane foam: the reticulated polyurethane foam of definite shape size is cleaned up, immerse in the 1% polyethyleneimine: amine aqueous solution behind the airing, fully soak into, extrude unnecessary polyethyleneimine: amine aqueous solution, blow away and be attached on the inside and outside formed liquid film in porous plastics aperture, and seasoning.
The preparation of B, slurry: load weighted 200ml water is added in the container of agitator, add the 25g dextrin while stirring it fully is dissolved in the water, then with 15g clay, 60g α-Al
2O
3, 500g SiC adds in the container successively, makes slurry through fully stirring.
C, hanging: will activate, dried reticulated polyurethane foam puts into slurry, and treat that it suctions the unnecessary slurry of extruding part behind the slurry, will form base substrate thereby get rid of the unnecessary slurry in the further place to go of slurry through whizzer then.
D, drying: the base substrate that makes is dry under 110 ℃ environment.
E, under 1450 ℃, burn till and be incubated 90min, cool to room temperature with the furnace and can obtain finished product.
Embodiment 2:
The surface activation process of A, urethane foam: the reticulated polyurethane foam of definite shape size is cleaned up, immerse in the 4% polyethyleneimine: amine aqueous solution behind the airing, fully soak into, extrude unnecessary polyethyleneimine: amine aqueous solution, blow away and be attached on the inside and outside formed liquid film in porous plastics aperture, and seasoning.
The preparation of B, slurry: load weighted 200ml water is added in the container of agitator, add 10g dextrin and 60g silicon sol while stirring and make it fully dissolve, be dispersed in the water, then with 25g clay, 50g α-Al
2O
3, 500g SiC adds in the container successively, makes slurry through fully stirring.
C, hanging: will activate, dried reticulated polyurethane foam puts into slurry, and treat that it suctions the unnecessary slurry of extruding part behind the slurry, will form base substrate thereby get rid of the unnecessary slurry in the further place to go of slurry through whizzer then.
D, drying: the base substrate that makes is dry under 110 ℃ environment.
E, under 1450 ℃, burn till and be incubated 90min, cool to room temperature with the furnace and can obtain finished product.
Embodiment 3:
The surface activation process of A, urethane foam: the reticulated polyurethane foam of definite shape size is cleaned up, immerse in the 2% polyethyleneimine: amine aqueous solution behind the airing, fully soak into, extrude unnecessary polyethyleneimine: amine aqueous solution, blow away and be attached on the inside and outside formed liquid film in porous plastics aperture, and seasoning.
The preparation of B, slurry: load weighted 200ml water is added in the container of agitator, add 20g dextrin and 80g silicon sol while stirring and make it fully dissolve, be dispersed in the water, then with 20g clay, 40g α-Al
2O
3, 500g SiC adds in the container successively, makes slurry through fully stirring.
C, hanging: will activate, dried reticulated polyurethane foam puts into slurry, and treat that it suctions the unnecessary slurry of extruding part behind the slurry, will form base substrate thereby get rid of the unnecessary slurry in the further place to go of slurry through whizzer then.
D, drying: the base substrate that makes is dry under 110 ℃ environment.
E, under 1450 ℃, burn till and be incubated 90min, cool to room temperature with the furnace and can obtain finished product.
Claims (4)
1, a kind of preparation method of moulding used foam ceramic filter is to be in the slurry of main component with SiC by reticulated polyurethane foam, and through dipping, get rid of slurry and make base substrate, and drying and 1400～1500 ℃ of high-temperature firings form, and it is characterized in that:
A, described reticulated polyurethane foam be earlier through surface activation process, is to carry out soaking paste again after 1%～4% polyethyleneimine: amine aqueous solution carries out surface activation process through concentration promptly;
B, described be that its binding agent of slurry of main component is the mixture that dextrin or dextrin and silicon sol are formed with SiC; Wherein in the mixture the shared weight percent of silicon sol less than 85%; Weight of binder be in the slurry SiC weight 5%～20%.
2, the preparation method of a kind of moulding used foam ceramic filter according to claim 1 is characterized in that: described is that the slurry of main component is by SiC, α-Al with SiC
2O
3, clay, water and binding agent form, slurry is a benchmark with SiC weight, α-Al
2O
3Content be 8%～12% of SiC, the content of clay is 3%～5% of SiC.
3, the preparation method of a kind of moulding used foam ceramic filter according to claim 1 and 2 is characterized in that: the purity of used SiC powder is higher than 96%, wherein impurity F e
2O
3Content is lower than 1%.
4, the preparation method of a kind of moulding used foam ceramic filter according to claim 1 is characterized in that: the base substrate of described ceramic foam filter gets rid of slurry by whizzer and removes unnecessary slurry and make.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2006100174352A CN100336780C (en) | 2006-02-20 | 2006-02-20 | Method for preparing moulding used foam ceramic filter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2006100174352A CN100336780C (en) | 2006-02-20 | 2006-02-20 | Method for preparing moulding used foam ceramic filter |
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| Publication Number | Publication Date |
|---|---|
| CN1830911A true CN1830911A (en) | 2006-09-13 |
| CN100336780C CN100336780C (en) | 2007-09-12 |
Family
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|---|---|---|---|
| CNB2006100174352A Expired - Fee Related CN100336780C (en) | 2006-02-20 | 2006-02-20 | Method for preparing moulding used foam ceramic filter |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102173857A (en) * | 2010-12-20 | 2011-09-07 | 中钢集团洛阳耐火材料研究院有限公司 | Preparation method of mullite mesh ceramic foam filter |
| CN102775174A (en) * | 2012-08-22 | 2012-11-14 | 北京科技大学 | Preparation and application method of surface active aluminum oxide foam ceramic filter |
| CN103011887A (en) * | 2011-09-28 | 2013-04-03 | 贵州师范大学 | Silicon carbide foamed ceramics and preparation method thereof |
| CN104557123A (en) * | 2015-01-15 | 2015-04-29 | 柏跃龙 | Silicon carbide foamed ceramic material |
| CN111187095A (en) * | 2018-11-14 | 2020-05-22 | 汉泰黄石科技有限公司 | Preparation method of foamed ceramic material, foamed ceramic material and application of foamed ceramic material |
| CN117160143A (en) * | 2023-08-23 | 2023-12-05 | 苏州兴业材料科技股份有限公司 | Foam ceramic filter and preparation method thereof |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102861481B (en) * | 2012-09-06 | 2015-03-25 | 河南科技大学 | Method for manufacturing liquid metal filter for casting |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| NO303259B1 (en) * | 1989-04-12 | 1998-06-15 | Int Control Automation Finance | Frequency shift modulation and demodulation for serial communication on a current loop |
| US6663776B2 (en) * | 2001-10-03 | 2003-12-16 | Selee Corporation | High strength SiC filter and method for the manufacture thereof |
| CN1548214A (en) * | 2003-05-07 | 2004-11-24 | 胡福贵 | Prepn of porous zirconia corundum filter |
-
2006
- 2006-02-20 CN CNB2006100174352A patent/CN100336780C/en not_active Expired - Fee Related
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102173857A (en) * | 2010-12-20 | 2011-09-07 | 中钢集团洛阳耐火材料研究院有限公司 | Preparation method of mullite mesh ceramic foam filter |
| CN103011887A (en) * | 2011-09-28 | 2013-04-03 | 贵州师范大学 | Silicon carbide foamed ceramics and preparation method thereof |
| CN102775174A (en) * | 2012-08-22 | 2012-11-14 | 北京科技大学 | Preparation and application method of surface active aluminum oxide foam ceramic filter |
| CN102775174B (en) * | 2012-08-22 | 2013-11-06 | 北京科技大学 | Preparation and application method of surface active aluminum oxide foam ceramic filter |
| CN104557123A (en) * | 2015-01-15 | 2015-04-29 | 柏跃龙 | Silicon carbide foamed ceramic material |
| CN111187095A (en) * | 2018-11-14 | 2020-05-22 | 汉泰黄石科技有限公司 | Preparation method of foamed ceramic material, foamed ceramic material and application of foamed ceramic material |
| CN117160143A (en) * | 2023-08-23 | 2023-12-05 | 苏州兴业材料科技股份有限公司 | Foam ceramic filter and preparation method thereof |
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| Publication number | Publication date |
|---|---|
| CN100336780C (en) | 2007-09-12 |
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