CN110640083A - Preparation method of slurry for aluminum alloy investment casting shell - Google Patents
Preparation method of slurry for aluminum alloy investment casting shell Download PDFInfo
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- 238000005495 investment casting Methods 0.000 title claims abstract description 20
- 239000002002 slurry Substances 0.000 title claims abstract description 20
- 238000002360 preparation method Methods 0.000 title claims abstract description 17
- 229910000838 Al alloy Inorganic materials 0.000 title claims abstract description 12
- 239000000835 fiber Substances 0.000 claims abstract description 19
- 239000002131 composite material Substances 0.000 claims abstract description 18
- 229910001570 bauxite Inorganic materials 0.000 claims abstract description 10
- WGLPBDUCMAPZCE-UHFFFAOYSA-N Trioxochromium Chemical compound O=[Cr](=O)=O WGLPBDUCMAPZCE-UHFFFAOYSA-N 0.000 claims abstract description 9
- 229910000423 chromium oxide Inorganic materials 0.000 claims abstract description 9
- 239000004576 sand Substances 0.000 claims abstract description 9
- WYTGDNHDOZPMIW-RCBQFDQVSA-N alstonine Natural products C1=CC2=C3C=CC=CC3=NC2=C2N1C[C@H]1[C@H](C)OC=C(C(=O)OC)[C@H]1C2 WYTGDNHDOZPMIW-RCBQFDQVSA-N 0.000 claims abstract description 8
- 229910052845 zircon Inorganic materials 0.000 claims abstract description 8
- GFQYVLUOOAAOGM-UHFFFAOYSA-N zirconium(iv) silicate Chemical compound [Zr+4].[O-][Si]([O-])([O-])[O-] GFQYVLUOOAAOGM-UHFFFAOYSA-N 0.000 claims abstract description 8
- MRELNEQAGSRDBK-UHFFFAOYSA-N lanthanum(3+);oxygen(2-) Chemical compound [O-2].[O-2].[O-2].[La+3].[La+3] MRELNEQAGSRDBK-UHFFFAOYSA-N 0.000 claims description 44
- 238000003756 stirring Methods 0.000 claims description 25
- 150000003754 zirconium Chemical class 0.000 claims description 22
- MCMNRKCIXSYSNV-UHFFFAOYSA-N Zirconium dioxide Chemical compound O=[Zr]=O MCMNRKCIXSYSNV-UHFFFAOYSA-N 0.000 claims description 18
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 15
- QCWXUUIWCKQGHC-UHFFFAOYSA-N Zirconium Chemical compound [Zr] QCWXUUIWCKQGHC-UHFFFAOYSA-N 0.000 claims description 15
- 229910052726 zirconium Inorganic materials 0.000 claims description 15
- 239000011246 composite particle Substances 0.000 claims description 12
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 10
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 10
- 238000000498 ball milling Methods 0.000 claims description 10
- 238000002156 mixing Methods 0.000 claims description 10
- 238000009210 therapy by ultrasound Methods 0.000 claims description 10
- 238000001816 cooling Methods 0.000 claims description 8
- 238000000034 method Methods 0.000 claims description 8
- 238000001035 drying Methods 0.000 claims description 7
- 238000009987 spinning Methods 0.000 claims description 7
- 229920001661 Chitosan Polymers 0.000 claims description 6
- 125000002057 carboxymethyl group Chemical group [H]OC(=O)C([H])([H])[*] 0.000 claims description 6
- 241000779819 Syncarpia glomulifera Species 0.000 claims description 5
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 claims description 5
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims description 5
- KZHJGOXRZJKJNY-UHFFFAOYSA-N dioxosilane;oxo(oxoalumanyloxy)alumane Chemical compound O=[Si]=O.O=[Si]=O.O=[Al]O[Al]=O.O=[Al]O[Al]=O.O=[Al]O[Al]=O KZHJGOXRZJKJNY-UHFFFAOYSA-N 0.000 claims description 5
- GVGUFUZHNYFZLC-UHFFFAOYSA-N dodecyl benzenesulfonate;sodium Chemical compound [Na].CCCCCCCCCCCCOS(=O)(=O)C1=CC=CC=C1 GVGUFUZHNYFZLC-UHFFFAOYSA-N 0.000 claims description 5
- 230000001804 emulsifying effect Effects 0.000 claims description 5
- 238000001914 filtration Methods 0.000 claims description 5
- 238000010438 heat treatment Methods 0.000 claims description 5
- 238000002844 melting Methods 0.000 claims description 5
- 230000008018 melting Effects 0.000 claims description 5
- 229910052863 mullite Inorganic materials 0.000 claims description 5
- 229910052757 nitrogen Inorganic materials 0.000 claims description 5
- 239000012299 nitrogen atmosphere Substances 0.000 claims description 5
- 239000002245 particle Substances 0.000 claims description 5
- 239000001739 pinus spp. Substances 0.000 claims description 5
- 229920001495 poly(sodium acrylate) polymer Polymers 0.000 claims description 5
- 238000010008 shearing Methods 0.000 claims description 5
- 229940080264 sodium dodecylbenzenesulfonate Drugs 0.000 claims description 5
- NNMHYFLPFNGQFZ-UHFFFAOYSA-M sodium polyacrylate Chemical compound [Na+].[O-]C(=O)C=C NNMHYFLPFNGQFZ-UHFFFAOYSA-M 0.000 claims description 5
- OGIDPMRJRNCKJF-UHFFFAOYSA-N titanium oxide Inorganic materials [Ti]=O OGIDPMRJRNCKJF-UHFFFAOYSA-N 0.000 claims description 5
- 229940036248 turpentine Drugs 0.000 claims description 5
- 238000005406 washing Methods 0.000 claims description 5
- 238000005491 wire drawing Methods 0.000 claims description 3
- 238000005452 bending Methods 0.000 abstract description 9
- 238000005266 casting Methods 0.000 abstract description 5
- 230000003111 delayed effect Effects 0.000 abstract description 4
- 238000002074 melt spinning Methods 0.000 abstract description 3
- 239000011257 shell material Substances 0.000 description 37
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 9
- RVTZCBVAJQQJTK-UHFFFAOYSA-N oxygen(2-);zirconium(4+) Chemical compound [O-2].[O-2].[Zr+4] RVTZCBVAJQQJTK-UHFFFAOYSA-N 0.000 description 9
- 229910001928 zirconium oxide Inorganic materials 0.000 description 9
- 230000000052 comparative effect Effects 0.000 description 6
- 239000011248 coating agent Substances 0.000 description 3
- 238000000576 coating method Methods 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 239000006004 Quartz sand Substances 0.000 description 2
- 238000005336 cracking Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000011819 refractory material Substances 0.000 description 2
- YKTSYUJCYHOUJP-UHFFFAOYSA-N [O--].[Al+3].[Al+3].[O-][Si]([O-])([O-])[O-] Chemical compound [O--].[Al+3].[Al+3].[O-][Si]([O-])([O-])[O-] YKTSYUJCYHOUJP-UHFFFAOYSA-N 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000001354 calcination Methods 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 239000002904 solvent Substances 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C9/00—Moulds or cores; Moulding processes
- B22C9/02—Sand moulds or like moulds for shaped castings
- B22C9/04—Use of lost patterns
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C3/00—Selection of compositions for coating the surfaces of moulds, cores, or patterns
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Mold Materials And Core Materials (AREA)
- Inorganic Compounds Of Heavy Metals (AREA)
- Compositions Of Oxide Ceramics (AREA)
Abstract
The invention discloses a preparation method of slurry for an aluminum alloy investment casting shell, and particularly relates to the technical field of casting. The basalt, the zircon sand, the serpentine, the bauxite and the chromium oxide are used for preparing the composite refractory fiber through melt spinning, the composite refractory fiber is applied to the preparation of the investment casting shell, the bending strength of the shell is increased, the crack propagation is delayed, the mechanical property of the shell is obviously improved, the shell is not easy to crack, meanwhile, the high temperature resistance of the shell is better, and the high temperature self-weight deformation rate of the shell is reduced.
Description
Technical Field
The invention belongs to the technical field of casting, and particularly relates to a preparation method of slurry for an aluminum alloy investment casting shell.
Background
The manufacture of the shell is one of the key processes of investment casting. The shell of investment casting is made of refractory material, adhesive and solvent through such technological steps as coating, sand spraying, drying, hardening, dewaxing and calcining. The refractory material in the shell accounts for about 90% of the weight of the shell, so that the reasonable selection and preparation of the shell have important influence on the quality, cost and production efficiency of castings.
The patent application No. 2011101447574 discloses an investment casting shell material comprising 100# quartz sand, 20# 30# quartz sand and bauxite, but the resulting shell has low strength and is prone to cracking.
Disclosure of Invention
In view of the above problems, the present invention is directed to a method for preparing a slurry for an aluminum alloy investment casting shell.
The invention is realized by the following technical scheme:
a preparation method of slurry for an aluminum alloy investment casting shell comprises the following steps:
(1) uniformly mixing 20-50 parts by weight of basalt, 10-15 parts by weight of zircon sand and 10-15 parts by weight of serpentine, treating at the low temperature of-10 to-15 ℃ for 4-6h, then treating at the temperature of 230-240 ℃ for 2-3h, introducing nitrogen for protection, and then reducing to room temperature at the rate of 2-3 ℃/min;
(2) adding 30-50 parts of bauxite and 10-20 parts of chromium oxide into the product obtained in the step (1), then carrying out ball milling for 10-15min, heating and melting to form a spinning solution, then carrying out wire drawing, cooling and finally shearing to obtain a composite refractory fiber with the diameter of 6-8 mu m and the length of 4-6 mm; basalt, zircon sand, serpentine, bauxite and chromium oxide are used for being matched with bauxite and chromium oxide to prepare the composite refractory fiber through melt spinning, the composite refractory fiber is applied to preparation of a casting shell of a casting mold, the bending strength of the shell is increased, crack propagation is delayed, the mechanical property of the shell is obviously improved, the shell is not easy to crack, meanwhile, the high-temperature resistance of the shell is better, and the high-temperature self-weight deformation rate of the shell is reduced;
(3) ball-milling 40-60 parts of alumina, 15-25 parts of mullite and 10-12 parts of titanium oxide until the granularity is 300-400 meshes, then adding 30-50 parts of the composite refractory fiber obtained in the step (2), uniformly stirring and mixing, then adding the modified zirconium sol, and stirring at the room temperature of 100-120rpm for 20-30min to obtain the target slurry.
Further, the preparation method of the modified zirconium sol in the step (3) comprises the following steps:
(1) adding 10-15 parts by weight of lanthanum oxide into an ethanol solution of sodium dodecyl benzene sulfonate with the mass fraction of 3-5% and the volume of which is 6-10 times of that of the lanthanum oxide, adding 5-8 parts by weight of turpentine and 3-5 parts by weight of sodium polyacrylate, stirring, emulsifying and dispersing at 1000-1200rpm for 30-40min, adding 15-20 parts of organic zirconium salt, stirring at 50-55 deg.C and 500-600rpm for 30-50min, then adding 3-5% sodium hydroxide, adjusting pH to 6-8, stirring for 40-50min, standing for 2-3 hr, centrifuging for 15-20min, filtering, washing, drying at 40-45 ℃, and then roasting the obtained product at 550-580 ℃ for 2-3h in a nitrogen atmosphere to obtain zirconia-coated lanthanum oxide composite particles; the zirconium sol is modified by using the lanthanum oxide composite particles coated by the zirconium oxide, so that the zirconium sol has good dispersibility in the zirconium sol and is not easy to settle, meanwhile, the high-temperature resistance of the sol is improved, and the high-temperature self-weight deformation rate of the shell is reduced;
(2) and (2) adding 20-25 parts of the zirconia-coated lanthanum oxide composite particles obtained in the step (1) into 150-200 parts of zirconium sol, then adding 20-25 parts of carboxymethyl chitosan, and performing ultrasonic treatment for 15-20min to obtain the modified zirconium sol.
Further, the zirconium sol in the step (2) contains 30-35% of zirconium oxide, and the particle size is 10-20 nm.
Further, the ultrasonic treatment condition of the step (2) is 50-55 KHz.
The invention has the beneficial effects that: the shell prepared by the slurry for the investment casting shell has the advantages of high normal-temperature bending strength and high-temperature bending strength, good mechanical property, difficult cracking, low high-temperature self-weight deformation rate and excellent performance. The basalt, the zircon sand, the serpentine, the bauxite and the chromium oxide are used for preparing the composite refractory fiber through melt spinning, the composite refractory fiber is applied to the preparation of the investment casting shell, the bending strength of the shell is increased, the crack propagation is delayed, the mechanical property of the shell is obviously improved, the shell is not easy to crack, meanwhile, the high temperature resistance of the shell is better, and the high temperature self-weight deformation rate of the shell is reduced; the zirconium sol is modified by wrapping the lanthanum oxide composite particles with the zirconium oxide, so that the zirconium sol has good dispersibility in the zirconium sol and is not easy to settle, meanwhile, the high-temperature resistance of the sol is improved, the high-temperature self-weight deformation rate of the shell is reduced, the evaporation of water is delayed due to the existence of carboxymethyl chitosan, the shell is not easy to crack, and the mechanical property of the shell is consolidated.
Detailed Description
The invention is illustrated by the following specific examples, which are not intended to be limiting.
Example 1
A preparation method of slurry for an aluminum alloy investment casting shell comprises the following steps:
(1) uniformly mixing 20 parts by weight of basalt, 10 parts by weight of zircon sand and 10 parts by weight of serpentine, treating at the low temperature of-10 ℃ for 4 hours, then treating at the temperature of 230 ℃ for 2 hours, introducing nitrogen for protection, and then cooling to the room temperature at the speed of 2 ℃/min;
(2) adding 30 parts of bauxite and 10 parts of chromium oxide into the product obtained in the step (1), then carrying out ball milling for 10min, heating and melting to form a spinning solution, then carrying out wire drawing, cooling and finally shearing to obtain a composite refractory fiber with the diameter of 6-8 mu m and the length of 4-6 mm;
(3) and (3) ball-milling 40 parts of alumina, 15 parts of mullite and 10 parts of titanium oxide until the granularity is 300 meshes, then adding 30 parts of the composite refractory fiber obtained in the step (2), stirring and mixing uniformly, then adding the modified zirconium sol, and stirring at room temperature and 100rpm for 20min to obtain the target slurry.
Further, the preparation method of the modified zirconium sol in the step (3) comprises the following steps:
(1) adding 10 parts by weight of lanthanum oxide into an ethanol solution of sodium dodecyl benzene sulfonate with the mass fraction of 3% and 6 times of the volume of the lanthanum oxide, adding 5 parts of turpentine and 3 parts of sodium polyacrylate, stirring, emulsifying and dispersing for 30min at 1000rpm, then adding 15 parts of organic zirconium salt, stirring for 30min at 50 ℃ and 500rpm, then adding 3% by weight of sodium hydroxide, adjusting the pH to 6, continuously stirring for 40min, standing for 2h, centrifuging for 15min, filtering, washing, drying at 40 ℃, and then roasting the obtained product for 2h at 550 ℃ and under the nitrogen atmosphere to obtain zirconium oxide coated lanthanum oxide composite particles;
(2) and (2) adding 20 parts of the zirconia-coated lanthanum oxide composite particles obtained in the step (1) into 150 parts of zirconium sol, then adding 20 parts of carboxymethyl chitosan, and carrying out ultrasonic treatment for 15min to obtain the modified zirconium sol.
Further, the zirconium sol in the step (2) contains 30% of zirconium oxide, and the particle size is 10 nm.
Further, the ultrasonic treatment condition in the step (2) is 50 KHz.
Example 2
A preparation method of slurry for an aluminum alloy investment casting shell comprises the following steps:
(1) uniformly mixing 30 parts by weight of basalt, 12 parts by weight of zircon sand and 12 parts by weight of serpentine, treating at a low temperature of-13 ℃ for 5 hours, then treating at 235 ℃ for 3 hours, introducing nitrogen for protection, and then cooling to room temperature at a speed of 3 ℃/min;
(2) adding 40 parts of bauxite and 15 parts of chromium oxide into the product obtained in the step (1), carrying out ball milling for 12min, heating and melting to form a spinning solution, drawing the spinning solution, cooling, and finally shearing to obtain a composite refractory fiber with the diameter of 6-8 mu m and the length of 4-6 mm;
(3) and (3) ball-milling 50 parts of alumina, 20 parts of mullite and 11 parts of titanium oxide until the granularity is 350 meshes, then adding 40 parts of the composite refractory fiber obtained in the step (2), uniformly stirring and mixing, then adding the modified zirconium sol, and stirring at room temperature and 110rpm for 25min to obtain the target slurry.
Further, the preparation method of the modified zirconium sol in the step (3) comprises the following steps:
(1) adding 12 parts by weight of lanthanum oxide into an ethanol solution of sodium dodecyl benzene sulfonate with the mass fraction of 4% and the volume of which is 8 times that of the lanthanum oxide, adding 7 parts by weight of turpentine and 4 parts by weight of sodium polyacrylate, stirring at 1100rpm, emulsifying and dispersing for 35min, then adding 18 parts by weight of organic zirconium salt, stirring at 53 ℃ and 550rpm for 40min, then adding 4% by weight of sodium hydroxide, adjusting the pH to 7, continuously stirring for 45min, standing for 3h, centrifuging for 18min, filtering, washing, drying at 43 ℃, and roasting the obtained product at 570 ℃ for 3h in a nitrogen atmosphere to obtain zirconium oxide coated lanthanum oxide composite particles;
(2) adding 23 parts of the zirconia-coated lanthanum oxide composite particles obtained in the step (1) into 180 parts of zirconium sol, then adding 23 parts of carboxymethyl chitosan, and carrying out ultrasonic treatment for 18min to obtain the modified zirconium sol.
Further, the zirconium sol in the step (2) contains 32% of zirconium oxide, and the particle size is 15 nm.
Further, the ultrasonic treatment condition in the step (2) is 53 KHz.
Example 3
A preparation method of slurry for an aluminum alloy investment casting shell comprises the following steps:
(1) uniformly mixing 50 parts by weight of basalt, 15 parts by weight of zircon sand and 15 parts by weight of serpentine, treating at a low temperature of-15 ℃ for 6 hours, then treating at a temperature of 240 ℃ for 3 hours, introducing nitrogen for protection, and then cooling to room temperature at a speed of 3 ℃/min;
(2) adding 50 parts of bauxite and 20 parts of chromium oxide into the product obtained in the step (1), performing ball milling for 15min, heating and melting to form a spinning solution, drawing the spinning solution, cooling, and finally shearing to obtain a composite refractory fiber with the diameter of 6-8 mu m and the length of 4-6 mm;
(3) and (3) ball-milling 60 parts of alumina, 25 parts of mullite and 12 parts of titanium oxide until the granularity is 400 meshes, then adding 50 parts of the composite refractory fiber obtained in the step (2), uniformly stirring and mixing, then adding the modified zirconium sol, and stirring at room temperature and 120rpm for 30min to obtain the target slurry.
Further, the preparation method of the modified zirconium sol in the step (3) comprises the following steps:
(1) adding 15 parts by weight of lanthanum oxide into ethanol solution of sodium dodecyl benzene sulfonate with the mass fraction of 5% and the volume of which is 10 times that of the lanthanum oxide, adding 8 parts of turpentine and 5 parts of sodium polyacrylate, stirring at 1200rpm, emulsifying and dispersing for 40min, then adding 20 parts of organic zirconium salt, stirring at 55 ℃ and 600rpm for 50min, then adding 5% by weight of sodium hydroxide, adjusting the pH to 8, continuously stirring for 50min, standing for 3h, centrifuging for 20min, filtering, washing, drying at 45 ℃, and roasting the obtained product at 580 ℃ for 3h in a nitrogen atmosphere to obtain zirconium oxide coated lanthanum oxide composite particles;
(2) and (2) adding 25 parts of the zirconia-coated lanthanum oxide composite particles obtained in the step (1) into 200 parts of zirconium sol, then adding 25 parts of carboxymethyl chitosan, and carrying out ultrasonic treatment for 20min to obtain the modified zirconium sol.
Further, the zirconium sol in the step (2) contains 35% of zirconium oxide, and the particle size is 20 nm.
Further, the ultrasonic treatment condition in the step (2) is 55 KHz.
Comparative example 1
In this comparative example, the steps of the method were the same as in example 1 except that the addition of the composite refractory fiber was omitted.
Comparative example 2
This comparative example compared to example 1, the method steps were identical except that the composite refractory fibers were replaced with an equal amount of aluminum silicate fibers.
Comparative example 3
In this comparative example, compared to example 1, the steps of the method were the same except that the modified zirconium sol was replaced with a common unmodified zirconium sol.
Preparing a shell: and uniformly coating the shell slurry obtained in each group on the surface of a wax mold, wherein the thickness of a coating film is 8mm, drying at room temperature, uniformly bundling by using iron wires, fixing, standing for 3 hours, and roasting at 900 ℃ for 120min to obtain the cast shell.
The shells obtained from each group were subjected to a performance test:
the room temperature bending strength, the 900 ℃ high temperature bending strength and the high temperature self-weight deformation rate of each group of obtained shells were measured according to HB5352-2004 'test method for investment casting shell performance'. Each set of 5 specimens, each specimen was tested 5 times and the average was taken.
The test results are shown in table 1:
TABLE 1
As can be seen from Table 1, the shell prepared by the slurry for investment casting of the invention not only has higher normal temperature bending strength and high temperature bending strength, good mechanical properties, and is not easy to crack, but also has lower high temperature self-weight deformation rate and excellent performance.
Claims (4)
1. The preparation method of the slurry for the aluminum alloy investment casting shell is characterized by comprising the following steps of:
(1) uniformly mixing 20-50 parts by weight of basalt, 10-15 parts by weight of zircon sand and 10-15 parts by weight of serpentine, treating at the low temperature of-10 to-15 ℃ for 4-6h, then treating at the temperature of 230-240 ℃ for 2-3h, introducing nitrogen for protection, and then reducing to room temperature at the rate of 2-3 ℃/min;
(2) adding 30-50 parts of bauxite and 10-20 parts of chromium oxide into the product obtained in the step (1), then carrying out ball milling for 10-15min, heating and melting to form a spinning solution, then carrying out wire drawing, cooling and finally shearing to obtain a composite refractory fiber with the diameter of 6-8 mu m and the length of 4-6 mm;
(3) ball-milling 40-60 parts of alumina, 15-25 parts of mullite and 10-12 parts of titanium oxide until the granularity is 300-400 meshes, then adding 30-50 parts of the composite refractory fiber obtained in the step (2), uniformly stirring and mixing, then adding the modified zirconium sol, and stirring at the room temperature of 100-120rpm for 20-30min to obtain the target slurry.
2. The method for preparing the slurry for the aluminum alloy investment casting shell according to claim 1, wherein the modified zirconium sol prepared in the step (3) is prepared by the following steps:
(1) adding 10-15 parts by weight of lanthanum oxide into an ethanol solution of sodium dodecyl benzene sulfonate with the mass fraction of 3-5% and the volume of which is 6-10 times of that of the lanthanum oxide, adding 5-8 parts by weight of turpentine and 3-5 parts by weight of sodium polyacrylate, stirring, emulsifying and dispersing at 1000-1200rpm for 30-40min, adding 15-20 parts of organic zirconium salt, stirring at 50-55 deg.C and 500-600rpm for 30-50min, then adding 3-5% sodium hydroxide, adjusting pH to 6-8, stirring for 40-50min, standing for 2-3 hr, centrifuging for 15-20min, filtering, washing, drying at 40-45 ℃, and then roasting the obtained product at 550-580 ℃ for 2-3h in a nitrogen atmosphere to obtain zirconia-coated lanthanum oxide composite particles;
(2) and (2) adding 20-25 parts of the zirconia-coated lanthanum oxide composite particles obtained in the step (1) into 150-200 parts of zirconium sol, then adding 20-25 parts of carboxymethyl chitosan, and performing ultrasonic treatment for 15-20min to obtain the modified zirconium sol.
3. The method of claim 2, wherein the zirconia sol of step (2) has a zirconia content of 30 to 35% and a particle size of 10 to 20 nm.
4. The method of preparing a slurry for an aluminum alloy investment casting shell according to claim 2, wherein the ultrasonic treatment condition of the step (2) is 50 to 55 KHz.
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Effective date of registration: 20231222 Address after: 411100 No.535 Haiou East Road, Yisuhe Town, Xiangtan County, Xiangtan City, Hunan Province Patentee after: Hunan Puka Technology Manufacturing Co.,Ltd. Address before: 236500 south of Kaiyuan Road, Xicheng Industrial Park, Jieshou City, Fuyang City, Anhui Province Patentee before: Anhui Huifeng Renewable Resources Technology Co.,Ltd. |