CN116003156B - MgAlON ceramic filter with multiple pore structures for magnesium alloy and preparation method thereof - Google Patents
MgAlON ceramic filter with multiple pore structures for magnesium alloy and preparation method thereof Download PDFInfo
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- CN116003156B CN116003156B CN202211478884.2A CN202211478884A CN116003156B CN 116003156 B CN116003156 B CN 116003156B CN 202211478884 A CN202211478884 A CN 202211478884A CN 116003156 B CN116003156 B CN 116003156B
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- 239000000919 ceramic Substances 0.000 title claims abstract description 108
- 239000011148 porous material Substances 0.000 title claims abstract description 71
- 238000002360 preparation method Methods 0.000 title claims abstract description 69
- 229910000861 Mg alloy Inorganic materials 0.000 title claims abstract description 58
- 229920005830 Polyurethane Foam Polymers 0.000 claims abstract description 103
- 239000011496 polyurethane foam Substances 0.000 claims abstract description 103
- 239000000843 powder Substances 0.000 claims abstract description 79
- CPLXHLVBOLITMK-UHFFFAOYSA-N magnesium oxide Inorganic materials [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 claims abstract description 70
- 239000002002 slurry Substances 0.000 claims abstract description 52
- 239000000395 magnesium oxide Substances 0.000 claims abstract description 48
- 239000002994 raw material Substances 0.000 claims abstract description 44
- 235000015895 biscuits Nutrition 0.000 claims abstract description 38
- 239000002243 precursor Substances 0.000 claims abstract description 32
- AXZKOIWUVFPNLO-UHFFFAOYSA-N magnesium;oxygen(2-) Chemical compound [O-2].[Mg+2] AXZKOIWUVFPNLO-UHFFFAOYSA-N 0.000 claims abstract description 25
- 239000008367 deionised water Substances 0.000 claims abstract description 24
- 229910021641 deionized water Inorganic materials 0.000 claims abstract description 24
- 238000000034 method Methods 0.000 claims abstract description 24
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 24
- 238000005303 weighing Methods 0.000 claims abstract description 23
- 239000002270 dispersing agent Substances 0.000 claims abstract description 15
- 238000005245 sintering Methods 0.000 claims abstract description 15
- 238000001816 cooling Methods 0.000 claims abstract description 12
- 238000010907 mechanical stirring Methods 0.000 claims abstract description 12
- 239000002518 antifoaming agent Substances 0.000 claims abstract description 5
- 238000004321 preservation Methods 0.000 claims abstract description 4
- 238000002156 mixing Methods 0.000 claims abstract description 3
- 230000000630 rising effect Effects 0.000 claims description 29
- 229910018072 Al 2 O 3 Inorganic materials 0.000 claims description 28
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 26
- 238000001035 drying Methods 0.000 claims description 26
- VTHJTEIRLNZDEV-UHFFFAOYSA-L magnesium dihydroxide Chemical compound [OH-].[OH-].[Mg+2] VTHJTEIRLNZDEV-UHFFFAOYSA-L 0.000 claims description 15
- 239000000347 magnesium hydroxide Substances 0.000 claims description 15
- 229910001862 magnesium hydroxide Inorganic materials 0.000 claims description 15
- 229910052757 nitrogen Inorganic materials 0.000 claims description 13
- 238000002791 soaking Methods 0.000 claims description 13
- 239000001095 magnesium carbonate Substances 0.000 claims description 11
- ZLNQQNXFFQJAID-UHFFFAOYSA-L magnesium carbonate Chemical compound [Mg+2].[O-]C([O-])=O ZLNQQNXFFQJAID-UHFFFAOYSA-L 0.000 claims description 11
- 235000014380 magnesium carbonate Nutrition 0.000 claims description 11
- 229910000021 magnesium carbonate Inorganic materials 0.000 claims description 11
- 229920002545 silicone oil Polymers 0.000 claims description 8
- 239000012670 alkaline solution Substances 0.000 claims description 6
- 239000001577 tetrasodium phosphonato phosphate Substances 0.000 claims description 6
- 239000004115 Sodium Silicate Substances 0.000 claims description 5
- 235000019795 sodium metasilicate Nutrition 0.000 claims description 5
- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical compound [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 claims description 5
- 229910052911 sodium silicate Inorganic materials 0.000 claims description 5
- 239000004721 Polyphenylene oxide Substances 0.000 claims description 4
- 125000000118 dimethyl group Chemical group [H]C([H])([H])* 0.000 claims description 4
- 238000010438 heat treatment Methods 0.000 claims description 4
- 239000000463 material Substances 0.000 claims description 4
- 229920000570 polyether Polymers 0.000 claims description 4
- 239000001509 sodium citrate Substances 0.000 claims description 4
- NLJMYIDDQXHKNR-UHFFFAOYSA-K sodium citrate Chemical compound O.O.[Na+].[Na+].[Na+].[O-]C(=O)CC(O)(CC([O-])=O)C([O-])=O NLJMYIDDQXHKNR-UHFFFAOYSA-K 0.000 claims description 4
- QGZKDVFQNNGYKY-UHFFFAOYSA-O Ammonium Chemical compound [NH4+] QGZKDVFQNNGYKY-UHFFFAOYSA-O 0.000 claims description 3
- DBMJMQXJHONAFJ-UHFFFAOYSA-M Sodium laurylsulphate Chemical compound [Na+].CCCCCCCCCCCCOS([O-])(=O)=O DBMJMQXJHONAFJ-UHFFFAOYSA-M 0.000 claims description 3
- 239000001913 cellulose Substances 0.000 claims description 3
- 229920002678 cellulose Polymers 0.000 claims description 3
- QXLPXWSKPNOQLE-UHFFFAOYSA-N methylpentynol Chemical compound CCC(C)(O)C#C QXLPXWSKPNOQLE-UHFFFAOYSA-N 0.000 claims description 3
- 229920001495 poly(sodium acrylate) polymer Polymers 0.000 claims description 3
- 229920000058 polyacrylate Polymers 0.000 claims description 3
- FQENQNTWSFEDLI-UHFFFAOYSA-J sodium diphosphate Chemical compound [Na+].[Na+].[Na+].[Na+].[O-]P([O-])(=O)OP([O-])([O-])=O FQENQNTWSFEDLI-UHFFFAOYSA-J 0.000 claims description 3
- GCLGEJMYGQKIIW-UHFFFAOYSA-H sodium hexametaphosphate Chemical compound [Na]OP1(=O)OP(=O)(O[Na])OP(=O)(O[Na])OP(=O)(O[Na])OP(=O)(O[Na])OP(=O)(O[Na])O1 GCLGEJMYGQKIIW-UHFFFAOYSA-H 0.000 claims description 3
- 235000019982 sodium hexametaphosphate Nutrition 0.000 claims description 3
- NNMHYFLPFNGQFZ-UHFFFAOYSA-M sodium polyacrylate Chemical compound [Na+].[O-]C(=O)C=C NNMHYFLPFNGQFZ-UHFFFAOYSA-M 0.000 claims description 3
- 229940048086 sodium pyrophosphate Drugs 0.000 claims description 3
- 235000019832 sodium triphosphate Nutrition 0.000 claims description 3
- 235000019818 tetrasodium diphosphate Nutrition 0.000 claims description 3
- GTVWRXDRKAHEAD-UHFFFAOYSA-N Tris(2-ethylhexyl) phosphate Chemical compound CCCCC(CC)COP(=O)(OCC(CC)CCCC)OCC(CC)CCCC GTVWRXDRKAHEAD-UHFFFAOYSA-N 0.000 claims description 2
- 235000019333 sodium laurylsulphate Nutrition 0.000 claims description 2
- 229910052799 carbon Inorganic materials 0.000 abstract description 11
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 abstract description 10
- 230000036571 hydration Effects 0.000 abstract description 3
- 238000006703 hydration reaction Methods 0.000 abstract description 3
- 238000007781 pre-processing Methods 0.000 abstract 1
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 54
- 239000000243 solution Substances 0.000 description 18
- 239000006260 foam Substances 0.000 description 15
- 230000035939 shock Effects 0.000 description 13
- 230000000052 comparative effect Effects 0.000 description 12
- 230000000694 effects Effects 0.000 description 10
- 239000000956 alloy Substances 0.000 description 9
- 238000005520 cutting process Methods 0.000 description 9
- 239000013530 defoamer Substances 0.000 description 9
- 239000007788 liquid Substances 0.000 description 9
- 229910045601 alloy Inorganic materials 0.000 description 8
- 238000001179 sorption measurement Methods 0.000 description 8
- 230000008569 process Effects 0.000 description 6
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 5
- 229920002635 polyurethane Polymers 0.000 description 5
- 239000004814 polyurethane Substances 0.000 description 5
- 229910052596 spinel Inorganic materials 0.000 description 5
- 239000011029 spinel Substances 0.000 description 5
- 238000000746 purification Methods 0.000 description 4
- 230000009467 reduction Effects 0.000 description 4
- 230000009286 beneficial effect Effects 0.000 description 3
- 230000015572 biosynthetic process Effects 0.000 description 3
- 230000007547 defect Effects 0.000 description 3
- 238000001914 filtration Methods 0.000 description 3
- 238000011065 in-situ storage Methods 0.000 description 3
- 239000007787 solid Substances 0.000 description 3
- 238000003723 Smelting Methods 0.000 description 2
- 238000005452 bending Methods 0.000 description 2
- 238000000354 decomposition reaction Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- MRELNEQAGSRDBK-UHFFFAOYSA-N lanthanum(3+);oxygen(2-) Chemical compound [O-2].[O-2].[O-2].[La+3].[La+3] MRELNEQAGSRDBK-UHFFFAOYSA-N 0.000 description 2
- 239000011777 magnesium Substances 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000005979 thermal decomposition reaction Methods 0.000 description 2
- 230000008646 thermal stress Effects 0.000 description 2
- BSWXAWQTMPECAK-UHFFFAOYSA-N 6,6-diethyloctyl dihydrogen phosphate Chemical compound CCC(CC)(CC)CCCCCOP(O)(O)=O BSWXAWQTMPECAK-UHFFFAOYSA-N 0.000 description 1
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 229920001577 copolymer Polymers 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 238000013016 damping Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 239000010419 fine particle Substances 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 229910052749 magnesium Inorganic materials 0.000 description 1
- 238000005121 nitriding Methods 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000003746 solid phase reaction Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
Classifications
-
- 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
- Y02P10/20—Recycling
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- Filtering Materials (AREA)
Abstract
The invention discloses a MgAlON ceramic filter with a multiple pore structure for magnesium alloy and a preparation method thereof, at least comprising the following steps: step S1, weighing raw materials: weighing magnesium oxide precursor powder and alpha-Al 2O3 powder according to a proportion, and mixing the powder to obtain a raw material; step S2, slurry preparation: adding 0.2-0.7wt% of dispersing agent, 2-8wt% of defoaming agent and 15-30wt% of deionized water into the raw materials, and preparing into homogeneous slurry by mechanical stirring; s3, preprocessing polyurethane foam to obtain preprocessed polyurethane foam; step S4, biscuit preparation: immersing the pretreated polyurethane foam into the slurry to obtain a ceramic filter biscuit; step S5, sintering: and placing the ceramic filter biscuit into a high-temperature furnace for heat preservation, and cooling to obtain the MgAlON ceramic filter with the multiple pore structure for the magnesium alloy. Compared with the prior art, the method has less carbon emission, can effectively solve the hydration problem of MgO in the slurry preparation process, and has higher purity of the MgAlON ceramic filter with the multiple pore structure.
Description
Technical Field
The invention relates to the technical field of foam ceramic filters for magnesium alloys, in particular to a MgAlON ceramic filter with a multiple pore structure for magnesium alloys and a preparation method thereof.
Background
The magnesium alloy is used as the lightest commercial metal engineering structural material at present, and is widely applied due to the advantages of high specific strength, specific rigidity, good heat conduction electrical property and damping effect, excellent electromagnetic shielding performance, easy processing and recycling, and the like. In particular, with the continuous development of magnesium raw material preparation technology and smelting technology in recent years, magnesium alloy materials are increasingly applied to the fields of aerospace, automobiles, ships, electronics and medical treatment, and become a third material for pursuing the competition of various countries.
However, for a long time, the adverse effect of nonmetallic inclusion formed in the smelting process of magnesium alloy on the casting performance and mechanical property of the product is a prominent problem, which can obviously reduce the mechanical strength, the cast surface integrity, the smoothness and the corrosion resistance of the material, and severely limit the application of the magnesium alloy in the high-end field and under the limit condition. Therefore, there is a need to reduce the content of nonmetallic inclusions in magnesium alloys to improve the quality of magnesium alloy products.
The foamed ceramic is a filtering medium for efficiently removing nonmetallic inclusions in molten alloy in recent years, and the performance of the foamed ceramic is required to meet the following requirements for effectively improving the quality of alloy products: the high-temperature mechanical strength is high, and the high-temperature alloy liquid can withstand mechanical impact; good thermal shock resistance and resistance to thermal shock of high-temperature alloy liquid; the chemical stability of the alloy liquid is kept at high temperature, and the alloy liquid does not react with alloy elements; has good adsorption effect on nonmetallic inclusions.
A great deal of research is developed for the preparation and performance optimization technicians of the foamed ceramic filter for magnesium alloy.
For example, a magnesia foam ceramic filter and a preparation method thereof (CN 200910220791.8) are disclosed, wherein the foam ceramic filter prepared by taking pure MgO as a raw material has a certain adsorption effect on nonmetallic inclusions, but has lower thermal shock resistance.
In another example, "a magnesia-alumina spinel foam filter and a preparation method thereof" (CN 201310539992.0), spinel or alumina and magnesium hydroxide are used as raw materialsThe magnesia-alumina spinel foam filter is prepared after high-temperature sintering, and has great improvement in strength, but Al in magnesia-alumina spinel at high temperature 2 O 3 Can be reduced by metal Mg to form MgO inclusion, thereby reducing the adsorption effect and polluting alloy liquid.
For example, the spinel reinforced magnesia-based foam ceramic filter and the preparation method thereof (CN 201810307618.0) are prepared by taking alumina and magnesia as raw materials and adding lanthanum oxide as a sintering aid at a lower temperature, and have good effects on thermal shock resistance and large-size inclusion adsorption, but the ceramic filter surface is compact and smooth, so that small-size nonmetallic inclusions are difficult to adsorb effectively, and the purification effect is effective.
In another example, the porous magnesia-based ceramic filter with a multi-pore structure and the preparation method thereof (CN 201911398532.4) take magnesite as a raw material, and the magnesia-based ceramic filter with the multi-pore structure is prepared by a two-step method, so that a certain effect is achieved in the aspect of adsorbing nonmetallic inclusions, but the preparation process is complicated, the raw material cost is high, and the porous magnesia-based ceramic filter is not suitable for large-scale application.
In short, it is difficult to combine excellent high temperature performance with good purification effect in the magnesium alloy foam ceramic filter in the prior art.
Disclosure of Invention
The invention provides a MgAlON ceramic filter with a multiple pore structure for magnesium alloy and a preparation method thereof.
The technical scheme adopted by the invention is as follows:
the preparation method of the MgAlON ceramic filter with the multiple pore structure for the magnesium alloy at least comprises the following steps:
step S1, weighing raw materials: proportionally weighing magnesium oxide precursor powder and alpha-Al 2 O 3 Powder and mixing the powder to obtain a raw material;
step S2, slurry preparation: adding 0.2-0.7wt% of dispersing agent, 2-8wt% of defoaming agent and 15-30wt% of deionized water into the raw materials, and preparing into homogeneous slurry by mechanical stirring;
step S3, pretreatment of polyurethane foam: soaking polyurethane foam in alkaline solution, taking out, removing the alkaline solution by deionized water, and naturally airing to obtain pretreated polyurethane foam;
step S4, biscuit preparation: immersing the pretreated polyurethane foam into the slurry, taking out the pretreated polyurethane foam after the pretreated polyurethane foam is uniformly adhered to the slurry, naturally drying the pretreated polyurethane foam, and further heating and drying the pretreated polyurethane foam to obtain a ceramic filter biscuit;
step S5, sintering: and placing the ceramic filter biscuit into a high-temperature furnace for heat preservation, and cooling to obtain the MgAlON ceramic filter with the multiple pore structure for the magnesium alloy.
Further, in the step S1, the mass fraction of the magnesium oxide precursor powder is 70-85wt%, and the alpha-Al is 2 O 3 The mass fraction of the powder is 15-30wt%.
Further, the magnesium oxide precursor powder in the step S1 includes one of magnesium hydroxide and magnesite.
Further, the magnesium oxide precursor powder and the α -Al in the step S1 2 O 3 The granularity of the powder is 0.044-0.088 mm, and the alpha-Al 2 O 3 Al in powder 2 O 3 The content is more than 98wt%.
Further, the dispersant in the step S2 includes one of sodium hexametaphosphate, sodium tripolyphosphate, sodium pyrophosphate, sodium dodecyl sulfate, ammonium polyacrylate, methylpentanol, triethylhexyl phosphate, sodium polyacrylate, and cellulose derivative.
Further, the defoaming agent in the step S2 includes one of sodium citrate, sodium metasilicate, polyether modified silicone oil and dimethyl silicone oil.
Further, in the step S3, the pore diameter of the polyurethane foam is 8-60 PPI, and the porosity is 65-85%; the PH of the alkaline solution is 7.5-8.8, and the temperature is 45-65 ℃; the soaking time is 15-40 min.
Further, in the step S4, the temperature for further heating and drying is 110-200 ℃, and the drying time is 15-30 hours.
Further, flowing nitrogen is introduced into the high-temperature furnace in the step S5, the temperature is raised to 800-1000 ℃ at the temperature rising rate of 5-15 ℃ per minute, after heat preservation is carried out for 1-3 hours, the temperature is raised to 1700-1850 ℃ at the temperature rising rate of 3-10 ℃ per minute, the temperature is kept for 3-5 hours, and the cooled temperature is taken out.
The invention also provides a MgAlON ceramic filter with a multiple pore structure for magnesium alloy, which is prepared by the preparation method of the MgAlON ceramic filter with the multiple pore structure for magnesium alloy.
The beneficial effects of the invention are as follows:
1. according to the invention, polyurethane organic foam is used as a carbon source, and the MgAlON ceramic filter with a multiple pore structure is directly synthesized by combining an in-situ decomposition method and a carbothermal reduction nitridation method, so that compared with the preparation process of the traditional foam ceramic filter, the carbon emission is obviously reduced, the process is simpler, and the cost is lower; and the prepared MgAlON ceramic filter has fewer defects and higher purity.
2. Compared with the prior art, the preparation method has the advantages of simpler preparation process, lower cost and less carbon emission, can effectively solve the hydration problem of MgO in the slurry preparation process, and has higher purity of the prepared MgAlON ceramic filter with the multiple pore structure.
3. The MgAlON ceramic filter high-temperature magnesium alloy liquid with the multi-pore structure has more excellent purification capability and stronger adsorption capability on micron-sized small-size nonmetallic inclusions.
4. The MgAlON ceramic filter prepared by the invention contains a multi-pore structure of millimeter-scale coarse pores and micron-scale fine pores, thereby not only ensuring the filtration efficiency of magnesium alloy liquid, but also effectively absorbing tiny nonmetallic inclusions which cannot be effectively absorbed by the traditional foam ceramic filter.
5. The MgAlON ceramic filter with the multi-pore structure has the advantages that on one hand, the MgAlON ceramic has extremely high bending strength and hardness and good thermal shock resistance, on the other hand, the multi-pore structure can effectively absorb thermal stress in the thermal shock process, and the formation of cracks is reduced, so that the MgAlON ceramic filter has better high-temperature mechanical strength and thermal shock resistance and longer service life.
Detailed Description
The following description of at least one exemplary embodiment is merely exemplary in nature and is in no way intended to limit the invention, its application, or uses. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Example 1
The preparation method of the MgAlON ceramic filter with the multiple pore structure for the magnesium alloy at least comprises the following steps:
step S1, weighing raw materials: weighing magnesium hydroxide which is magnesium oxide precursor powder with the mass fraction of 70wt% and alpha-Al with the mass fraction of 25wt% 2 O 3 Powders, the magnesium oxide precursor powder magnesium hydroxide and the alpha-Al 2 O 3 The granularity of the powder is 0.044-0.088 mm, and the alpha-Al 2 O 3 Al in powder 2 O 3 The content is more than 98 weight percent, and the powder is mixed to obtain the raw material;
step S2, slurry preparation: adding 0.5 weight percent of dispersant sodium hexametaphosphate, 5 weight percent of defoamer sodium citrate and 20 weight percent of deionized water into the raw materials, and preparing a homogeneous slurry by mechanical stirring for 1 h;
step S3, pretreatment of polyurethane foam: cutting polyurethane foam with the aperture of 8-60 PPI and the porosity of 65-85% into a required shape and size, soaking the polyurethane foam in NaOH solution with the pH of 7.5-8.8 and the temperature of 50 ℃ for 20min, taking out, removing the NaOH solution by deionized water, and naturally airing to obtain pretreated polyurethane foam;
step S4, biscuit preparation: immersing the pretreated polyurethane foam into the slurry, taking out the pretreated polyurethane foam after the pretreated polyurethane foam is uniformly adhered to the slurry, naturally drying the pretreated polyurethane foam, and further drying the pretreated polyurethane foam at 150 ℃ for 20 hours to obtain a ceramic filter biscuit;
step S5, sintering: placing the ceramic filter biscuit in a high-temperature furnace, introducing flowing nitrogen, raising the temperature to 800 ℃ at the temperature raising rate of 10 ℃ per minute, keeping the temperature for 1h, continuing raising the temperature to 1700 ℃ at the temperature raising rate of 5 ℃ per minute, keeping the temperature for 3h, cooling, and taking out to obtain the MgAlON ceramic filter with the multiple pore structure for the magnesium alloy.
Example 2
The preparation method of the MgAlON ceramic filter with the multiple pore structure for the magnesium alloy at least comprises the following steps:
step S1, weighing raw materials: weighing 75wt% of magnesia precursor powder magnesite and 30wt% of alpha-Al 2 O 3 Powder, said magnesia precursor powder magnesite and said alpha-Al 2 O 3 The granularity of the powder is 0.044-0.088 mm, and the alpha-Al 2 O 3 Al in powder 2 O 3 The content is more than 98 weight percent, and the powder is mixed to obtain the raw material;
step S2, slurry preparation: adding 0.6 weight percent of dispersant sodium tripolyphosphate, 4 weight percent of defoamer sodium metasilicate and 25 weight percent of deionized water into the raw materials, and preparing a homogeneous slurry by mechanical stirring for 1.5 h;
step S3, pretreatment of polyurethane foam: cutting polyurethane foam with the aperture of 8-60 PPI and the porosity of 65-85% into a required shape and size, soaking the polyurethane foam in NaOH solution with the pH of 7.5-8.8 and the temperature of 55 ℃ for 20min, taking out, removing the NaOH solution by deionized water, and naturally airing to obtain pretreated polyurethane foam;
step S4, biscuit preparation: immersing the pretreated polyurethane foam into the slurry, taking out the pretreated polyurethane foam after the pretreated polyurethane foam is uniformly adhered to the slurry, naturally drying the pretreated polyurethane foam, and further drying the pretreated polyurethane foam at 150 ℃ for 25 hours to obtain a ceramic filter biscuit;
step S5, sintering: placing the ceramic filter biscuit in a high-temperature furnace, introducing flowing nitrogen, raising the temperature to 800 ℃ at the temperature raising rate of 10 ℃ per minute, keeping the temperature for 1.5 hours, continuing raising the temperature to 1700 ℃ at the temperature raising rate of 5 ℃ per minute, keeping the temperature for 3 hours, cooling, and taking out to obtain the MgAlON ceramic filter with the multiple pore structure for the magnesium alloy.
Example 3
The preparation method of the MgAlON ceramic filter with the multiple pore structure for the magnesium alloy at least comprises the following steps:
step S1, weighing raw materials: weighing magnesium hydroxide which is magnesium oxide precursor powder with the mass fraction of 80wt% and alpha-Al with the mass fraction of 18wt% 2 O 3 Powders, the magnesium oxide precursor powder magnesium hydroxide and the alpha-Al 2 O 3 The granularity of the powder is 0.044-0.088 mm, and the alpha-Al 2 O 3 Al in powder 2 O 3 The content is more than 98 weight percent, and the powder is mixed to obtain the raw material;
step S2, slurry preparation: adding 0.7 weight percent of dispersant sodium pyrophosphate, 3 weight percent of defoamer polyether modified silicone oil and 30 weight percent of deionized water into the raw materials, and preparing a homogeneous slurry by mechanical stirring for 0.5 h;
step S3, pretreatment of polyurethane foam: cutting polyurethane foam with the aperture of 8-60 PPI and the porosity of 65-85% into a required shape and size, putting the polyurethane foam into NaOH solution with the PH of 7.5-8.8 and the temperature of 60 ℃ for soaking for 25min, taking out, removing the NaOH solution by deionized water, and naturally airing to obtain pretreated polyurethane foam;
step S4, biscuit preparation: immersing the pretreated polyurethane foam into the slurry, taking out the pretreated polyurethane foam after the pretreated polyurethane foam is uniformly adhered to the slurry, naturally drying the pretreated polyurethane foam, and further drying the pretreated polyurethane foam at 180 ℃ for 20 hours to obtain a ceramic filter biscuit;
step S5, sintering: placing the ceramic filter biscuit in a high-temperature furnace, introducing flowing nitrogen, rising to 1000 ℃ at the temperature rising rate of 10 ℃ per minute, keeping the temperature for 2 hours, continuing rising to 1700 ℃ at the temperature rising rate of 5 ℃ per minute, keeping the temperature for 3 hours, cooling, and taking out to obtain the MgAlON ceramic filter with the multiple pore structure for the magnesium alloy.
Example 4
The preparation method of the MgAlON ceramic filter with the multiple pore structure for the magnesium alloy at least comprises the following steps:
step S1, weighing raw materials: weighing 85wt% of magnesia precursor powder magnesite and 28wt% of alpha-Al 2 O 3 Powder, said magnesia precursor powder magnesite and said alpha-Al 2 O 3 The granularity of the powder is 0.044-0.088 mm, and the alpha-Al 2 O 3 Al in powder 2 O 3 The content is more than 98 weight percent, and the powder is mixed to obtain the raw material;
step S2, slurry preparation: adding 0.2 weight percent of dispersant sodium dodecyl sulfate, 2 weight percent of defoamer dimethyl silicone oil and 28 weight percent of deionized water into the raw materials, and preparing a homogeneous slurry by mechanical stirring for 2 hours;
step S3, pretreatment of polyurethane foam: cutting polyurethane foam with the aperture of 8-60 PPI and the porosity of 65-85% into a required shape and size, soaking the polyurethane foam in NaOH solution with the pH of 7.5-8.8 and the temperature of 65 ℃ for 30min, taking out, removing the NaOH solution by deionized water, and naturally airing to obtain pretreated polyurethane foam;
step S4, biscuit preparation: immersing the pretreated polyurethane foam into the slurry, taking out the pretreated polyurethane foam after the pretreated polyurethane foam is uniformly adhered to the slurry, naturally drying the pretreated polyurethane foam, and further drying the pretreated polyurethane foam at 200 ℃ for 28 hours to obtain a ceramic filter biscuit;
step S5, sintering: placing the ceramic filter biscuit in a high-temperature furnace, introducing flowing nitrogen, rising to 900 ℃ at a temperature rising rate of 5 ℃ per minute, keeping the temperature for 3 hours, continuing rising to 1800 ℃ at a temperature rising rate of 8 ℃ per minute, keeping the temperature for 4 hours, cooling, and taking out to obtain the MgAlON ceramic filter with the multiple pore structure for magnesium alloy.
Example 5
The preparation method of the MgAlON ceramic filter with the multiple pore structure for the magnesium alloy at least comprises the following steps:
step S1, weighing raw materials: weighing 72wt% of magnesium hydroxide which is magnesium oxide precursor powder and 15wt% of alpha-Al 2 O 3 Powders, the magnesium oxide precursor powder magnesium hydroxide and the alpha-Al 2 O 3 The granularity of the powder is 0.044-0.088 mm, and the alpha-Al 2 O 3 Al in powder 2 O 3 The content is more than 98 weight percent, and the powder is mixed to obtain the raw material;
step S2, slurry preparation: adding 0.5 weight percent of dispersant ammonium polyacrylate, 5 weight percent of defoamer sodium citrate and 18 weight percent of deionized water into the raw materials, and preparing a homogeneous slurry by mechanical stirring for 0.5 h;
step S3, pretreatment of polyurethane foam: cutting polyurethane foam with the aperture of 8-60 PPI and the porosity of 65-85% into a required shape and size, soaking the polyurethane foam in NaOH solution with the pH of 7.5-8.8 and the temperature of 48 ℃ for 35min, taking out, removing the NaOH solution by deionized water, and naturally airing to obtain pretreated polyurethane foam;
step S4, biscuit preparation: immersing the pretreated polyurethane foam into the slurry, taking out the pretreated polyurethane foam after the pretreated polyurethane foam is uniformly adhered to the slurry, naturally drying the pretreated polyurethane foam, and further drying the pretreated polyurethane foam at 160 ℃ for 30 hours to obtain a ceramic filter biscuit;
step S5, sintering: placing the ceramic filter biscuit in a high-temperature furnace, introducing flowing nitrogen, rising to 800 ℃ at a temperature rising rate of 15 ℃ per minute, keeping the temperature for 1h, continuing rising to 1800 ℃ at a temperature rising rate of 10 ℃ per minute, keeping the temperature for 4h, cooling, and taking out to obtain the MgAlON ceramic filter with the multiple pore structure for the magnesium alloy.
Example 6
The preparation method of the MgAlON ceramic filter with the multiple pore structure for the magnesium alloy at least comprises the following steps:
step S1, weighing raw materials: weighing 78wt% of magnesia precursor powder magnesite and 25wt% of alpha-Al 2 O 3 Powder, said magnesia precursor powder magnesite and said alpha-Al 2 O 3 The granularity of the powder is 0.044-0.088 mm, and the alpha-Al 2 O 3 Al in powder 2 O 3 The content is more than 98 weight percent, and the powder is mixed to obtain the raw material;
step S2, slurry preparation: adding 0.4 weight percent of dispersant methylpentanol, 4 weight percent of defoamer sodium metasilicate and 16 weight percent of deionized water into the raw materials, and preparing a homogeneous slurry by mechanical stirring for 1 h;
step S3, pretreatment of polyurethane foam: cutting polyurethane foam with the aperture of 8-60 PPI and the porosity of 65-85% into a required shape and size, soaking the polyurethane foam in NaOH solution with the pH of 7.5-8.8 and the temperature of 45 ℃ for 40min, taking out, removing the NaOH solution with deionized water, and naturally airing to obtain pretreated polyurethane foam;
step S4, biscuit preparation: immersing the pretreated polyurethane foam into the slurry, taking out the pretreated polyurethane foam after the pretreated polyurethane foam is uniformly adhered to the slurry, naturally drying the pretreated polyurethane foam, and further drying the pretreated polyurethane foam at 120 ℃ for 18 hours to obtain a ceramic filter biscuit;
step S5, sintering: placing the ceramic filter biscuit in a high-temperature furnace, introducing flowing nitrogen, raising the temperature to 800 ℃ at the temperature raising rate of 8 ℃ per minute, keeping the temperature for 1.5 hours, continuing raising the temperature to 1800 ℃ at the temperature raising rate of 3 ℃ per minute, keeping the temperature for 4 hours, cooling, and taking out to obtain the MgAlON ceramic filter with the multiple pore structure for the magnesium alloy.
Example 7
The preparation method of the MgAlON ceramic filter with the multiple pore structure for the magnesium alloy at least comprises the following steps:
step S1, weighing raw materials: weighing 83wt% of magnesium hydroxide which is magnesium oxide precursor powder and 25wt% of alpha-Al 2 O 3 Powders, the magnesium oxide precursor powder magnesium hydroxide and the alpha-Al 2 O 3 The granularity of the powder is 0.044-0.088 mm, and the alpha-Al 2 O 3 Al in powder 2 O 3 The content is more than 98 weight percent, and the powder is mixed to obtain the raw material;
step S2, slurry preparation: adding 0.3 weight percent of dispersing agent triethylhexyl phosphoric acid, 3 weight percent of defoamer polyether modified silicone oil and 26 weight percent of deionized water into the raw materials, and preparing a homogeneous slurry by mechanical stirring for 1.5 h;
step S3, pretreatment of polyurethane foam: cutting polyurethane foam with the aperture of 8-60 PPI and the porosity of 65-85% into a required shape and size, soaking the polyurethane foam in NaOH solution with the pH of 7.5-8.8 and the temperature of 62 ℃ for 15min, taking out, removing the NaOH solution by deionized water, and naturally airing to obtain pretreated polyurethane foam;
step S4, biscuit preparation: immersing the pretreated polyurethane foam into the slurry, taking out the pretreated polyurethane foam after the pretreated polyurethane foam is uniformly adhered to the slurry, naturally drying the pretreated polyurethane foam, and further drying the pretreated polyurethane foam at 130 ℃ for 15 hours to obtain a ceramic filter biscuit;
step S5, sintering: placing the ceramic filter biscuit in a high-temperature furnace, introducing flowing nitrogen, rising to 1000 ℃ at the temperature rising rate of 12 ℃ per minute, keeping the temperature for 2 hours, continuing rising to 1850 ℃ at the temperature rising rate of 6 ℃ per minute, keeping the temperature for 5 hours, cooling, and taking out to obtain the MgAlON ceramic filter with the multiple pore structure for the magnesium alloy.
Example 8
The preparation method of the MgAlON ceramic filter with the multiple pore structure for the magnesium alloy at least comprises the following steps:
step S1, weighing raw materials: weighing magnesia precursor powder magnesite with mass fraction of 85wt% and alpha-Al with mass fraction of 25wt% 2 O 3 Powder, said magnesia precursor powder magnesite and said alpha-Al 2 O 3 The granularity of the powder is 0.044-0.088 mm, and the alpha-Al 2 O 3 Al in powder 2 O 3 The content is more than 98 weight percent, and the powder is mixed to obtain the raw material;
step S2, slurry preparation: adding 0.5 weight percent of dispersant sodium polyacrylate, 2 weight percent of defoamer dimethyl silicone oil and 15 weight percent of deionized water into the raw materials, and preparing a homogeneous slurry by mechanical stirring for 2 hours;
step S3, pretreatment of polyurethane foam: cutting polyurethane foam with the aperture of 8-60 PPI and the porosity of 65-85% into a required shape and size, soaking the polyurethane foam in NaOH solution with the pH of 7.5-8.8 and the temperature of 45 ℃ for 15min, taking out, removing the NaOH solution by deionized water, and naturally airing to obtain pretreated polyurethane foam;
step S4, biscuit preparation: immersing the pretreated polyurethane foam into the slurry, taking out the pretreated polyurethane foam after the pretreated polyurethane foam is uniformly adhered to the slurry, naturally drying the pretreated polyurethane foam, and further drying the pretreated polyurethane foam at 110 ℃ for 20 hours to obtain a ceramic filter biscuit;
step S5, sintering: placing the ceramic filter biscuit in a high-temperature furnace, introducing flowing nitrogen, rising to 900 ℃ at a temperature rising rate of 12 ℃ per minute, keeping the temperature for 3 hours, continuing rising to 1850 ℃ at a temperature rising rate of 8 ℃ per minute, keeping the temperature for 5 hours, cooling, and taking out to obtain the MgAlON ceramic filter with the multiple pore structure for the magnesium alloy.
Example 9
The preparation method of the MgAlON ceramic filter with the multiple pore structure for the magnesium alloy at least comprises the following steps:
step S1, weighing raw materials: weighing magnesium hydroxide which is magnesium oxide precursor powder with the mass fraction of 80wt% and alpha-Al with the mass fraction of 25wt% 2 O 3 Powders, the magnesium oxide precursor powder magnesium hydroxide and the alpha-Al 2 O 3 The granularity of the powder is 0.044-0.088 mm, and the alpha-Al 2 O 3 Al in powder 2 O 3 The content is more than 98 weight percent, and the powder is mixed to obtain the raw material;
step S2, slurry preparation: adding 0.5 weight percent of dispersant cellulose derivative, 4 weight percent of defoamer sodium metasilicate and 30 weight percent of deionized water into the raw materials, and preparing a homogeneous slurry by mechanical stirring for 0.5 h;
step S3, pretreatment of polyurethane foam: cutting polyurethane foam with the aperture of 8-60 PPI and the porosity of 65-85% into a required shape and size, soaking the polyurethane foam in NaOH solution with the pH of 7.5-8.8 and the temperature of 50 ℃ for 40min, taking out, removing the NaOH solution with deionized water, and naturally airing to obtain pretreated polyurethane foam;
step S4, biscuit preparation: immersing the pretreated polyurethane foam into the slurry, taking out the pretreated polyurethane foam after the pretreated polyurethane foam is uniformly adhered to the slurry, naturally drying the pretreated polyurethane foam, and further drying the pretreated polyurethane foam at 110 ℃ for 20 hours to obtain a ceramic filter biscuit;
step S5, sintering: placing the ceramic filter biscuit in a high-temperature furnace, introducing flowing nitrogen, rising to 900 ℃ at a temperature rising rate of 15 ℃ per minute, keeping the temperature for 2 hours, continuing rising to 1850 ℃ at a temperature rising rate of 10 ℃ per minute, keeping the temperature for 5 hours, cooling, and taking out to obtain the MgAlON ceramic filter with the multiple pore structure for the magnesium alloy.
Comparative example 1
The preparation is identical to example 1, except that: alpha-Al in step S1 2 O 3 The mass fraction of the powder was 60wt%.
Comparative example 2
The preparation is identical to example 1, except that: in step S1, alpha-Al is not added 2 O 3 And (5) powder.
Comparative example 3
The preparation is identical to example 1, except that: the mass fraction of magnesium hydroxide of the magnesium oxide precursor powder in the step S1 is 40wt%.
Comparative example 4
The preparation is identical to example 2, except that: the mass fraction of magnesium hydroxide of the magnesium oxide precursor powder in the step S1 is 90wt%.
Comparative example 5
The preparation is identical to example 3, except that: in the step S2, the dispersing agent is maleic anhydride copolymer.
Comparative example 6
The preparation is identical to example 4, except that: the polyurethane foam in step S3 had a pore size of 80PPI and a porosity of 90%.
Comparative example 7
The preparation is identical to example 5, except that: the additional amount of deionized water in step S2 was 50wt%.
Comparative example 8
The preparation is identical to example 6, except that: and in the step S5, the ceramic filter biscuit is placed in a high-temperature furnace, flowing nitrogen is introduced, the temperature is increased to 1200 ℃ at the temperature rising rate of 15 ℃ per minute, and the temperature is kept for 2 hours.
Comparative example 9
The preparation is identical to example 7, except that: and S5, placing the ceramic filter biscuit in a high-temperature furnace, introducing flowing nitrogen, raising the temperature to 1000 ℃ at the temperature raising rate of 12 ℃ per minute, keeping the temperature for 2 hours, continuing raising the temperature to 1650 ℃ at the temperature raising rate of 6 ℃ per minute, and keeping the temperature for 5 hours.
The performance of the examples and comparative examples was tested and the test results are shown in table 1:
table 1 comparative examples and comparative examples performance test table
In summary, in the specific embodiment, the polyurethane organic foam is used as a carbon source, and the MgAlON ceramic filter with the multiple pore structure is directly synthesized by combining an in-situ decomposition method and a carbothermal reduction nitridation method, so that compared with the preparation process of the traditional foam ceramic filter, the carbon emission is obviously reduced, the process is simpler, and the cost is lower; and the prepared MgAlON ceramic filter has fewer defects and higher purity.
The preparation method of MgAlON ceramics mainly comprises the following steps: (1) By AlN, al 2 O 3 MgO is used as a raw material, and is sintered at high temperature through solid phase reaction; (2) C, al by 2 O 3 、N 2 MgO is used as a raw material, and is sintered at a high temperature by a carbothermal reduction nitriding method. The former AlN raw material is expensive and is easily hydrated, and is not suitable for preparing slurry. The latter C raw material is oxidized during thermal decomposition of polyurethane, and both methods cannot effectively solve the problem that MgO is easy to hydrate in the slurry preparation process, so that the traditional method is not suitable for preparing MgAlON ceramic filters. The specific embodiment skillfully utilizes polyurethane organic foam as a carbon source and adopts the following components in N 2 Under the condition that the magnesium oxide precursor is carbonized at 800-1000 ℃ to leave solid carbon, and meanwhile, the magnesium oxide precursor is thermally decomposed in situ to form MgO, and a large number of micro-pores are reserved in pores in the magnesium oxide aggregate. Then sintering at 1700-1850 ℃ to obtain solid carbon, mgO and alpha-Al 2 O 3 The MgAlON ceramic filter with a multiple pore structure is formed by the carbothermal reduction nitridation method, and the multiple pore structure formed by the magnesium oxide precursor and the polyurethane thermal decomposition process is beneficial to the diffusion of gas into the blank, is beneficial to the complete progress of gas-solid reaction, improves the purity of the MgAlON ceramic filter and reduces the formation of defects. Compared with the prior art, the preparation process is simpler, the cost is lower, the carbon emission is less, the hydration problem of MgO in the slurry preparation process can be effectively solved, and the purity of the prepared MgAlON ceramic filter with the multiple pore structure is higher.
The MgAlON ceramic filter high-temperature magnesium alloy liquid with the multi-pore structure prepared by the specific embodiment has more excellent purification capability and stronger adsorption capability on micron-sized small-size nonmetallic inclusions.
The MgAlON ceramic filter with the multiple pore structure prepared by the specific embodiment has excellent purifying capability and higher innovation. In addition, in general, the smaller the pore diameter of the filter is, the stronger the adsorption capacity to fine particle inclusion, and the MgAlON ceramic filter prepared by the specific embodiment contains a multi-pore structure of millimeter-scale coarse pores and micron-scale fine pores, so that the filtration efficiency of magnesium alloy liquid is ensured, and the tiny nonmetallic inclusion which cannot be effectively adsorbed by the traditional foam ceramic filter can be effectively absorbed.
The MgAlON ceramic filter with the multi-pore structure for the magnesium alloy prepared by the specific embodiment has better high-temperature mechanical strength and thermal shock resistance and longer service life.
The existing magnesium alloy foam ceramic filter is damaged due to lower strength or weaker thermal shock resistance after being filtered in a short time, and the service life is shorter. In contrast, the MgAlON ceramic filter with the multiple pore structure prepared by the specific embodiment has the advantages that on one hand, the MgAlON ceramic filter has extremely high bending strength and hardness and good thermal shock resistance, on the other hand, the multiple pore structure can effectively absorb thermal stress in the thermal shock process, and the formation of cracks is reduced, so that the MgAlON ceramic filter has better high-temperature mechanical strength and thermal shock resistance and longer service life.
Therefore, the MgAlON ceramic filter with the multi-pore structure for the magnesium alloy prepared by the specific embodiment has excellent high-temperature mechanical strength and thermal shock resistance, has good adsorption effect on nonmetallic inclusions with different sizes, and is simple in preparation process and low in cost. Is suitable for purifying the ultra-clean and high-performance magnesium alloy.
The above description is only of the preferred embodiments of the present invention and is not intended to limit the present invention, but various modifications and variations can be made to the present invention by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. The preparation method of the MgAlON ceramic filter with the multiple pore structure for the magnesium alloy is characterized by at least comprising the following steps:
step S1, formerWeighing the materials: proportionally weighing magnesium oxide precursor powder and alpha-Al 2 O 3 Powder and mixing the powder to obtain a raw material;
step S2, slurry preparation: adding 0.2-0.7wt% of dispersing agent, 2-8wt% of defoaming agent and 15-30wt% of deionized water into the raw materials, and preparing into homogeneous slurry by mechanical stirring;
step S3, pretreatment of polyurethane foam: soaking polyurethane foam in alkaline solution, taking out, removing the alkaline solution by deionized water, and naturally airing to obtain pretreated polyurethane foam;
step S4, biscuit preparation: immersing the pretreated polyurethane foam into the slurry, taking out the pretreated polyurethane foam after the pretreated polyurethane foam is uniformly adhered to the slurry, naturally drying the pretreated polyurethane foam, and further heating and drying the pretreated polyurethane foam to obtain a ceramic filter biscuit;
step S5, sintering: and placing the ceramic filter biscuit into a high-temperature furnace for heat preservation, and cooling to obtain the MgAlON ceramic filter with the multiple pore structure for the magnesium alloy.
2. The method for preparing a MgAlON ceramic filter with a multiple pore structure for magnesium alloy according to claim 1, wherein the mass fraction of the magnesium oxide precursor powder in the step S1 is 70-85wt%, and the alpha-Al is as follows 2 O 3 The mass fraction of the powder is 15-30wt%.
3. The method for preparing a MgAlON ceramic filter with a multiple pore structure for magnesium alloy according to claim 1, wherein the magnesium oxide precursor powder in the step S1 comprises one of magnesium hydroxide and magnesite.
4. The method for preparing a MgAlON ceramic filter with a multiple pore structure for magnesium alloy according to claim 1, wherein the magnesium oxide precursor powder and the α -Al in the step S1 2 O 3 The granularity of the powder is 0.044-0.088 mm, and the alpha-Al 2 O 3 Al in powder 2 O 3 The content is more than 98wt%.
5. The method for preparing the MgAlON ceramic filter with the multiple pore structure for magnesium alloy according to claim 1, wherein the dispersant in the step S2 comprises one of sodium hexametaphosphate, sodium tripolyphosphate, sodium pyrophosphate, sodium dodecyl sulfate, ammonium polyacrylate, methylpentanol, triethylhexyl phosphate, sodium polyacrylate, and cellulose derivative.
6. The method for preparing the MgAlON ceramic filter with the multiple pore structure for magnesium alloy according to claim 1, wherein the defoaming agent in the step S2 comprises one of sodium citrate, sodium metasilicate, polyether modified silicone oil and dimethyl silicone oil.
7. The method for preparing the MgAlON ceramic filter with the multiple pore structure for the magnesium alloy according to claim 1, wherein the pore diameter of the polyurethane foam in the step S3 is 8-60 PPI, and the porosity is 65-85%; the pH value of the alkaline solution is 7.5-8.8, and the temperature is 45-65 ℃; the soaking time is 15-40 min.
8. The method for preparing the MgAlON ceramic filter with the multiple pore structure for the magnesium alloy according to claim 1, wherein the temperature for further heating and drying in the step S4 is 110-200 ℃ and the drying time is 15-30 h.
9. The method for preparing the MgAlON ceramic filter with the multiple pore structure for the magnesium alloy according to claim 1, wherein flowing nitrogen is introduced into the high-temperature furnace in the step S5, the temperature is raised to 800-1000 ℃ at the temperature rising rate of 5-15 ℃ per minute, the temperature is kept for 1-3 hours, the temperature is raised to 1700-1850 ℃ at the temperature rising rate of 3-10 ℃ per minute, the temperature is kept for 3-5 hours, and the temperature is cooled and then taken out.
10. The MgAlON ceramic filter with a multiple pore structure for magnesium alloy, characterized in that the MgAlON ceramic filter with a multiple pore structure for magnesium alloy is prepared by the preparation method of the MgAlON ceramic filter with a multiple pore structure for magnesium alloy according to any one of claims 1 to 9.
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