CN101138691B - Preparation method of magnesian foamed ceramic filter for casting - Google Patents
Preparation method of magnesian foamed ceramic filter for casting Download PDFInfo
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- CN101138691B CN101138691B CN2007101284392A CN200710128439A CN101138691B CN 101138691 B CN101138691 B CN 101138691B CN 2007101284392 A CN2007101284392 A CN 2007101284392A CN 200710128439 A CN200710128439 A CN 200710128439A CN 101138691 B CN101138691 B CN 101138691B
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Abstract
The present invention discloses a manufacture method of a magnesium foam ceramic filter used in foundry. The following components are mixed based on weight. The components consist of 50 to 80 weight shares of heavy magnesia, 10 to 30 weigh shares of light magnesia, 10 to 20 weight shares of magnesium bonding agent and 0.5 to 2.0 weight shares of dispersing agent, and are mixed into thixotropic slurry. 6-30PPI polyurethane foam is immersed into the slurry. After the foam is fully immersed, surplus slurry is extruded. A molded foam body is dried naturally or by heating, then fired at a constanttemperature between 1450 and 1600 centigrade degrees, and finally cooled down to the room temperature with a furnace. Thus, the magnesium foam ceramic filter is got. The magnesium foam ceramic filtergot with the present invention is provided with the advantage that the filter is fit for filtration and purification of magnesium alloy fluid and is high temperature and heat impact resistant.
Description
Technical field
The present invention relates to cast the preparation method with utensil, specifically, the present invention is a kind of preparation method of magnesian foamed ceramic filter for casting.
Background technology
At present, in Foundry Production, because the pore that produces in metal slag inclusion and the casting process occupies very big proportion in the casting wasted product rate.Along with developing rapidly of space technology, auto industry, more and more higher quality requirement has been proposed casting quality.In order to improve external quality in casting qualified rate and the foundry goods, reduce the cutter loss, usually adopt the molten metal filtering technique.
Foamed ceramics is a kind of filter, can carry out rectification, absorption and remove effects such as bulk is mingled with molten metal by its 3 D stereo network structure, plays the purpose that purifies molten metal.People adopt refractory materials such as aluminium oxide, carborundum, silica, zirconia to make the filter of aluminum filtration liquid, iron liquid, molten steel by adding organic or inorganic binder etc. at present.Patent documentation such as United States Patent (USP) 4024056,4075303,4975191,4923830,5520823,6663776 for example; Chinese patent 88101382,92102883 .0,02145312.8,03111617.5 etc. disclose the technology of preparing of ceramic foam filter.
But because magnesium elements is very active, very easily oxidation.And because magnesian free energy of formation all is lower than silica, aluminium oxide, adopt material filters such as aluminium oxide, silica, carborundum to cause the filter dissolving easily, thereby also cause the pollution of magnesium liquid, therefore the filtration, purification of magnesium alloy must adopt magnesia filter, because the very little flux that very easily adsorbs of the angle of wetting of magnesia and magnesium liquid is mingled with, simultaneous oxidation magnesium has good chemical stability to magnesium liquid.But the bibliographical information that does not still have magnesian foamed ceramic filter for casting at present.
Summary of the invention
The present invention has overcome above-mentioned shortcoming, has proposed a kind of preparation method of magnesian foamed ceramic filter for casting.The magnesian foamed ceramic filter that the present invention obtains has suitable liquid magnesium alloy filtration, purification and advantage high temperature resistant, heat shock resistance.
The present invention solves the technical scheme that its technical problem takes:
A kind of preparation method of magnesian foamed ceramic filter for casting, with following composition by weight ratio: 50-80 parts of heavy-burned magnesias, 10-30 parts of light calcined magnesias are added 10-20 parts magnesia binder and 0.5-2.0 parts dispersant, and are mixed into the thixotropic slurry; 6-30PPI polyurethane foam is immersed in the prepared slurry, and fully redundant sizing agent is extruded in soaking paste then; With the foam base substrate of forming, finish by air dry or oven dry, burnt till in 2-4 hours at 1450～1600 ℃ of following constant temperature then, cool to room temperature with the furnace and promptly obtain magnesian foamed ceramic filter.
Described heavy-burned magnesia is sintering or electrically molten magnesia; Granularity is less than 200 orders, and purity is greater than 95%.Under the optimum condition, the granularity of heavy-burned magnesia is less than 325 orders.Organize at filter that heavy-burned magnesia mainly plays skeleton function in the structure, help the raising of shock resistance under the high temperature.
Described light calcined magnesia is to burn till under 950～1150 ℃, and granularity is less than 325 orders, and purity is greater than 95%.The light calcined magnesia activity is higher, can react with water at normal temperatures, makes filter have needed intensity, at high temperature can acceleration of sintering, improve filter intensity.
Described dispersant is calgon or sodium phosphate trimer.
Described oven dry is 100～120 ℃ of dryings 1 hour.The time of described air dry is 6～12 hours.Promptly maybe need not dry air dry 6～12 hours about 1 hour 100～120 ℃ of dryings, these two kinds of methods can adopt.
The magnesia binder proportion that this filter adopts is greater than 1.2g/cm
3Magnesia binder can be a kind of or its combination of magnalium glue, magnesium chloride brine, waterglass, Ludox, methylcellulose, white glue with vinyl, sodium carboxymethylcellulose, polyvinyl alcohol, polyvinyl butyral resin, phenolic resins, silester.
The unit of account of polyurethane foam is PPI, i.e. hole count on the per inch area.
Of the present invention " greater than " or " less than ", comprised digital own.Less than 325 orders, its implication is that granularity is equal to or less than 325 orders as granularity.
Advantage of the present invention is as follows: the present invention compared with prior art, need not dry and adopt the short air dry time, cheap technical grade magnesia and magnesia binder have prepared magnesia filter, that this filter has is high temperature resistant, heat shock resistance and good thermal shock resistance, and with filtration magnesium liquid chemical reaction does not take place.75*75*22mm10PPI filter after burning is carried out the test normal temperature strength can reach 1.5MPa; Under 1100 ℃, the thermal shock resistance of test products 〉=4 time; Rupture strength at 1150 ℃ of following test products can reach 1.0MPa.Therefore this filter has excellent performance.
The specific embodiment
Embodiment 1
Adopting commercially available purity is 50 kilograms of 95%325 purpose electrically molten magnesias, 25 kilograms of 400 purpose light calcined magnesias, and (proportion is 1.25g/cm to add 25 kilograms magnesia binder again
3) and 1.0 kilograms calgon, be stirred into the thixotropic mud that viscosity is 1800-2500CP through high-speed mixer.The 20PPI100*100*22mm polyurethane foam is immersed in the prepared slurry, fully soaking paste is extruded about 60% slurry with crossing the roll squeezer with certain interval then, obtain semi-finished product, foam base substrate semi-finished product with forming, by 110 ℃ of dryings about 1 hour, be warming up to 1450 ℃ of insulations then and burnt till in 2 hours, cool to the furnace about 100 ℃ and take out.Promptly obtain magnesian foamed ceramic filter.
Embodiment 2
Adopting commercially available purity is 75 kilograms of 98% the heavy burned magnesium oxides of 325 purposes, 10 kilograms of 1150 ℃ of light calcined magnesias (400 purpose), and (proportion is 1.35g/cm to add 15 kilograms magnesia binder again
3) and 2.0 kilograms sodium phosphate trimer, be stirred into the thixotropic mud that viscosity is 1800-2500CP through high-speed mixer.The 6PPI75*75*22mm polyurethane foam is immersed in the prepared slurry, and about 60% slurry is extruded in abundant soaking paste roll-in then, obtains semi-finished product, foam base substrate semi-finished product with forming, air dry 12 hours was burnt till 1550 ℃ of insulations in 2 hours, cooled to the furnace about 100 ℃ and took out.Promptly obtain magnesian foamed ceramic filter.
Under 1100 ℃, the ceramic filter thermal shock resistance of test implementation example 1 and 2 gained each 5 times; 10 filters are used for the filtration of magnesium liquid, directly 720～750 ℃ of magnesium liquid are watered down from the height of 500mm, all filters have passed through detection.
More than the preparation method of magnesian foamed ceramic filter for casting provided by the present invention is described in detail, used specific case herein principle of the present invention and embodiment are set forth, the explanation of above embodiment just is used for helping to understand method of the present invention and core concept thereof; Simultaneously, for one of ordinary skill in the art, according to thought of the present invention, the part that all can change in specific embodiments and applications, in sum, this description should not be construed as limitation of the present invention.
Claims (8)
1. the preparation method of a magnesian foamed ceramic filter for casting, it is characterized in that, with following composition by weight ratio: heavy-burned magnesia 50-80 part, light calcined magnesia 10-30 part, add magnesia binder of 10-20 part and the dispersant of 0.5-2.0 part, and be mixed into the thixotropic slurry; The 6-30PPI polyurethane foam is immersed in the prepared slurry, and fully soaking paste liquid is extruded redundant sizing agent then; With the foam base substrate of forming, finish by air dry or oven dry, burnt till at 1450～1550 ℃ of following constant temperature 2-4 hours then, cool to room temperature with the furnace and obtain magnesian foamed ceramic filter; Described heavy-burned magnesia mainly plays skeleton function, helps the raising of shock resistance under the high temperature;
Described magnesia binder is a kind of or its combination of magnalium glue, magnesium chloride brine, waterglass, Ludox, methylcellulose, white glue with vinyl, sodium carboxymethylcellulose, polyvinyl alcohol, polyvinyl alcohol carboxylic butyraldehyde, phenolic resins, silester.
2. the preparation method of magnesian foamed ceramic filter for casting according to claim 1, it is characterized in that: described heavy-burned magnesia is sintering or electrically molten magnesia: granularity is less than 200 orders, and purity is greater than 95%.
3. the preparation method of magnesian foamed ceramic filter for casting according to claim 2, it is characterized in that: the granularity of described heavy-burned magnesia is less than 325 orders.
4. the preparation method of magnesian foamed ceramic filter for casting according to claim 1, it is characterized in that: described light calcined magnesia is to burn till under 950～1150 ℃, and granularity is less than 325 orders, and purity is greater than 95%.
5. the preparation method of magnesian foamed ceramic filter for casting according to claim 1, it is characterized in that: described dispersant is calgon or sodium phosphate trimer.
6. the preparation method of magnesian foamed ceramic filter for casting according to claim 1 is characterized in that: described oven dry is 100～120 ℃ of dryings 1 hour.
7. the preparation method of magnesian foamed ceramic filter for casting according to claim 1, it is characterized in that: the time of described air dry is 6～12 hours.
8. the preparation method of magnesian foamed ceramic filter for casting according to claim 1, it is characterized in that: the proportion of described magnesia binder is greater than 1.2g/cm
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Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN2007101284392A CN101138691B (en) | 2007-07-10 | 2007-07-10 | Preparation method of magnesian foamed ceramic filter for casting |
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| Application Number | Priority Date | Filing Date | Title |
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| CN2007101284392A CN101138691B (en) | 2007-07-10 | 2007-07-10 | Preparation method of magnesian foamed ceramic filter for casting |
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| CN101138691A CN101138691A (en) | 2008-03-12 |
| CN101138691B true CN101138691B (en) | 2011-05-04 |
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| CN2007101284392A Expired - Fee Related CN101138691B (en) | 2007-07-10 | 2007-07-10 | Preparation method of magnesian foamed ceramic filter for casting |
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Families Citing this family (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101785944B (en) * | 2010-03-11 | 2011-12-21 | 沈阳化工学院 | Preparation method of magnesium oxide ceramic foam filter for filtering magnesium and magnesium alloy melt |
| CN102350136A (en) * | 2011-09-07 | 2012-02-15 | 蚌埠市华顺电动机械厂 | Ceramic filter element and preparing method thereof |
| CN102350138B (en) * | 2011-09-07 | 2014-03-19 | 蚌埠市华顺电动机械厂 | Filter element and preparation method thereof |
| CN103787690A (en) * | 2014-02-25 | 2014-05-14 | 江苏威仕结构陶瓷有限公司 | Method for preparing magnesium oxide foamed ceramics |
| CN108484182B (en) | 2018-04-08 | 2020-05-01 | 江苏中翼汽车新材料科技有限公司 | Magnesium aluminate spinel reinforced magnesium oxide based foamed ceramic filter synthesized in situ by magnesium oxide whiskers and preparation method thereof |
| CN108439957B (en) | 2018-04-08 | 2020-04-21 | 凤阳爱尔思轻合金精密成型有限公司 | MA-M2T-spinel solid solution reinforced magnesium oxide base foamed ceramic filter and preparation method thereof |
| CN108484128B (en) * | 2018-04-08 | 2020-05-01 | 江苏中翼汽车新材料科技有限公司 | Mg (Al, Cr)2O4Composite spinel reinforced magnesium oxide base foamed ceramic filter and preparation method thereof |
| CN108530094B (en) * | 2018-04-08 | 2020-05-01 | 凤阳爱尔思轻合金精密成型有限公司 | Basic magnesium sulfate whisker in-situ synthesized magnesium aluminate spinel reinforced magnesium oxide based foamed ceramic filter and preparation method thereof |
| CN108503378B (en) | 2018-04-08 | 2020-06-05 | 江苏中翼汽车新材料科技有限公司 | Spinel reinforced magnesium oxide base foamed ceramic filter and preparation method thereof |
| CN108947567A (en) * | 2018-07-16 | 2018-12-07 | 大连传森科技有限公司 | A kind of light-weight refractory insulation magnesia brick and its processing method |
| CN110117195A (en) * | 2019-05-30 | 2019-08-13 | 龚建林 | A kind of preparation method of Anti-pressure filtering high-temperature flue gas dedicated ceramic |
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