CN117961046A - Durable zirconium tundish nozzle and preparation method thereof - Google Patents
Durable zirconium tundish nozzle and preparation method thereof Download PDFInfo
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- 238000002360 preparation method Methods 0.000 title claims abstract description 37
- 229910052726 zirconium Inorganic materials 0.000 title claims abstract description 18
- QCWXUUIWCKQGHC-UHFFFAOYSA-N Zirconium Chemical compound [Zr] QCWXUUIWCKQGHC-UHFFFAOYSA-N 0.000 title claims abstract description 17
- MCMNRKCIXSYSNV-UHFFFAOYSA-N Zirconium dioxide Chemical compound O=[Zr]=O MCMNRKCIXSYSNV-UHFFFAOYSA-N 0.000 claims abstract description 202
- 239000000919 ceramic Substances 0.000 claims abstract description 81
- 239000000843 powder Substances 0.000 claims abstract description 56
- 239000002131 composite material Substances 0.000 claims abstract description 34
- 239000000395 magnesium oxide Substances 0.000 claims abstract description 12
- CPLXHLVBOLITMK-UHFFFAOYSA-N magnesium oxide Inorganic materials [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 claims abstract description 12
- AXZKOIWUVFPNLO-UHFFFAOYSA-N magnesium;oxygen(2-) Chemical compound [O-2].[Mg+2] AXZKOIWUVFPNLO-UHFFFAOYSA-N 0.000 claims abstract description 12
- 239000000463 material Substances 0.000 claims abstract description 12
- PZNSFCLAULLKQX-UHFFFAOYSA-N Boron nitride Chemical compound N#B PZNSFCLAULLKQX-UHFFFAOYSA-N 0.000 claims abstract description 11
- BRPQOXSCLDDYGP-UHFFFAOYSA-N calcium oxide Chemical compound [O-2].[Ca+2] BRPQOXSCLDDYGP-UHFFFAOYSA-N 0.000 claims abstract description 11
- 239000000292 calcium oxide Substances 0.000 claims abstract description 11
- ODINCKMPIJJUCX-UHFFFAOYSA-N calcium oxide Inorganic materials [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 claims abstract description 11
- SIWVEOZUMHYXCS-UHFFFAOYSA-N oxo(oxoyttriooxy)yttrium Chemical compound O=[Y]O[Y]=O SIWVEOZUMHYXCS-UHFFFAOYSA-N 0.000 claims abstract description 11
- HBMJWWWQQXIZIP-UHFFFAOYSA-N silicon carbide Chemical compound [Si+]#[C-] HBMJWWWQQXIZIP-UHFFFAOYSA-N 0.000 claims abstract description 11
- 229910010271 silicon carbide Inorganic materials 0.000 claims abstract description 11
- 229910001570 bauxite Inorganic materials 0.000 claims abstract description 9
- 239000000126 substance Substances 0.000 claims abstract description 8
- 239000002893 slag Substances 0.000 claims abstract description 6
- IXQWNVPHFNLUGD-UHFFFAOYSA-N iron titanium Chemical compound [Ti].[Fe] IXQWNVPHFNLUGD-UHFFFAOYSA-N 0.000 claims abstract description 4
- 239000000243 solution Substances 0.000 claims description 45
- ZMANZCXQSJIPKH-UHFFFAOYSA-N Triethylamine Chemical compound CCN(CC)CC ZMANZCXQSJIPKH-UHFFFAOYSA-N 0.000 claims description 42
- YRKCREAYFQTBPV-UHFFFAOYSA-N acetylacetone Chemical compound CC(=O)CC(C)=O YRKCREAYFQTBPV-UHFFFAOYSA-N 0.000 claims description 34
- 238000001035 drying Methods 0.000 claims description 33
- 239000000835 fiber Substances 0.000 claims description 31
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 30
- 238000000465 moulding Methods 0.000 claims description 26
- 229910000505 Al2TiO5 Inorganic materials 0.000 claims description 24
- AABBHSMFGKYLKE-SNAWJCMRSA-N propan-2-yl (e)-but-2-enoate Chemical compound C\C=C\C(=O)OC(C)C AABBHSMFGKYLKE-SNAWJCMRSA-N 0.000 claims description 24
- 238000000034 method Methods 0.000 claims description 21
- VSCWAEJMTAWNJL-UHFFFAOYSA-K aluminium trichloride Chemical compound Cl[Al](Cl)Cl VSCWAEJMTAWNJL-UHFFFAOYSA-K 0.000 claims description 20
- 238000010438 heat treatment Methods 0.000 claims description 20
- 238000005245 sintering Methods 0.000 claims description 20
- 238000003756 stirring Methods 0.000 claims description 18
- 239000007787 solid Substances 0.000 claims description 17
- 238000000227 grinding Methods 0.000 claims description 16
- 239000000047 product Substances 0.000 claims description 14
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 13
- 238000002156 mixing Methods 0.000 claims description 13
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 claims description 12
- 239000002002 slurry Substances 0.000 claims description 12
- XJDNKRIXUMDJCW-UHFFFAOYSA-J titanium tetrachloride Chemical compound Cl[Ti](Cl)(Cl)Cl XJDNKRIXUMDJCW-UHFFFAOYSA-J 0.000 claims description 12
- 239000002245 particle Substances 0.000 claims description 11
- 239000002243 precursor Substances 0.000 claims description 11
- 239000008367 deionised water Substances 0.000 claims description 9
- 229910021641 deionized water Inorganic materials 0.000 claims description 9
- CSCPPACGZOOCGX-UHFFFAOYSA-N Acetone Chemical compound CC(C)=O CSCPPACGZOOCGX-UHFFFAOYSA-N 0.000 claims description 8
- 229910002076 stabilized zirconia Inorganic materials 0.000 claims description 8
- 239000000203 mixture Substances 0.000 claims description 7
- -1 polyoxyethylene Polymers 0.000 claims description 7
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 claims description 6
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 claims description 6
- 229920003171 Poly (ethylene oxide) Polymers 0.000 claims description 6
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 claims description 6
- 239000011248 coating agent Substances 0.000 claims description 6
- 238000000576 coating method Methods 0.000 claims description 6
- 238000000926 separation method Methods 0.000 claims description 6
- 238000006243 chemical reaction Methods 0.000 claims description 5
- 238000004321 preservation Methods 0.000 claims description 5
- 238000005406 washing Methods 0.000 claims description 5
- 238000007605 air drying Methods 0.000 claims description 4
- 239000012153 distilled water Substances 0.000 claims description 4
- 125000003438 dodecyl group Chemical group [H]C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])* 0.000 claims description 4
- 238000010041 electrostatic spinning Methods 0.000 claims description 4
- 239000000706 filtrate Substances 0.000 claims description 4
- 238000001746 injection moulding Methods 0.000 claims description 4
- 238000000462 isostatic pressing Methods 0.000 claims description 4
- 229910052751 metal Inorganic materials 0.000 claims description 4
- 239000002184 metal Substances 0.000 claims description 4
- GALOTNBSUVEISR-UHFFFAOYSA-N molybdenum;silicon Chemical compound [Mo]#[Si] GALOTNBSUVEISR-UHFFFAOYSA-N 0.000 claims description 4
- 238000012545 processing Methods 0.000 claims description 4
- 238000004537 pulping Methods 0.000 claims description 4
- 238000009987 spinning Methods 0.000 claims description 4
- UXVMQQNJUSDDNG-UHFFFAOYSA-L Calcium chloride Chemical compound [Cl-].[Cl-].[Ca+2] UXVMQQNJUSDDNG-UHFFFAOYSA-L 0.000 claims description 3
- BSDOQSMQCZQLDV-UHFFFAOYSA-N butan-1-olate;zirconium(4+) Chemical compound [Zr+4].CCCC[O-].CCCC[O-].CCCC[O-].CCCC[O-] BSDOQSMQCZQLDV-UHFFFAOYSA-N 0.000 claims description 3
- 238000001354 calcination Methods 0.000 claims description 3
- 239000001768 carboxy methyl cellulose Substances 0.000 claims description 3
- 238000002844 melting Methods 0.000 claims description 3
- 230000008018 melting Effects 0.000 claims description 3
- 239000002994 raw material Substances 0.000 claims description 3
- 229910000029 sodium carbonate Inorganic materials 0.000 claims description 3
- 238000001132 ultrasonic dispersion Methods 0.000 claims description 3
- DPXJVFZANSGRMM-UHFFFAOYSA-N acetic acid;2,3,4,5,6-pentahydroxyhexanal;sodium Chemical compound [Na].CC(O)=O.OCC(O)C(O)C(O)C(O)C=O DPXJVFZANSGRMM-UHFFFAOYSA-N 0.000 claims description 2
- 238000005345 coagulation Methods 0.000 claims description 2
- 230000015271 coagulation Effects 0.000 claims description 2
- 238000004821 distillation Methods 0.000 claims description 2
- 238000011049 filling Methods 0.000 claims description 2
- 230000010355 oscillation Effects 0.000 claims description 2
- 239000003973 paint Substances 0.000 claims description 2
- 230000002787 reinforcement Effects 0.000 claims description 2
- 235000019812 sodium carboxymethyl cellulose Nutrition 0.000 claims description 2
- 229920001027 sodium carboxymethylcellulose Polymers 0.000 claims description 2
- 238000000967 suction filtration Methods 0.000 claims description 2
- 230000035939 shock Effects 0.000 abstract description 16
- 229910000831 Steel Inorganic materials 0.000 abstract description 14
- 239000010959 steel Substances 0.000 abstract description 14
- 238000009749 continuous casting Methods 0.000 abstract description 5
- 230000003628 erosive effect Effects 0.000 abstract description 5
- 238000012360 testing method Methods 0.000 description 9
- 230000000052 comparative effect Effects 0.000 description 8
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical group O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 7
- 238000005266 casting Methods 0.000 description 7
- 230000000694 effects Effects 0.000 description 7
- 239000011148 porous material Substances 0.000 description 7
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 5
- 239000003638 chemical reducing agent Substances 0.000 description 5
- 238000001816 cooling Methods 0.000 description 5
- 230000008569 process Effects 0.000 description 5
- 230000000630 rising effect Effects 0.000 description 5
- 239000004576 sand Substances 0.000 description 5
- 239000011230 binding agent Substances 0.000 description 4
- 238000005520 cutting process Methods 0.000 description 4
- 239000006185 dispersion Substances 0.000 description 4
- 238000010304 firing Methods 0.000 description 4
- 239000006104 solid solution Substances 0.000 description 4
- 239000004372 Polyvinyl alcohol Substances 0.000 description 3
- 229910052782 aluminium Inorganic materials 0.000 description 3
- 239000013078 crystal Substances 0.000 description 3
- 238000007599 discharging Methods 0.000 description 3
- 235000019441 ethanol Nutrition 0.000 description 3
- 238000001914 filtration Methods 0.000 description 3
- 238000011068 loading method Methods 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 238000011056 performance test Methods 0.000 description 3
- 229920002451 polyvinyl alcohol Polymers 0.000 description 3
- 239000010936 titanium Substances 0.000 description 3
- 229910052719 titanium Inorganic materials 0.000 description 3
- XHOCYOFVZBXFEP-UHFFFAOYSA-J CO.[Cl-].[Cl-].[Cl-].[Cl-].[Ti+4] Chemical compound CO.[Cl-].[Cl-].[Cl-].[Cl-].[Ti+4] XHOCYOFVZBXFEP-UHFFFAOYSA-J 0.000 description 2
- 229920002134 Carboxymethyl cellulose Polymers 0.000 description 2
- 229920001353 Dextrin Polymers 0.000 description 2
- 239000004375 Dextrin Substances 0.000 description 2
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 2
- FHISHQWBZFWXSQ-UHFFFAOYSA-K [Al+3].[Cl-].[Cl-].[Cl-].OC Chemical compound [Al+3].[Cl-].[Cl-].[Cl-].OC FHISHQWBZFWXSQ-UHFFFAOYSA-K 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 2
- 238000004873 anchoring Methods 0.000 description 2
- 238000005452 bending Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 239000007767 bonding agent Substances 0.000 description 2
- 235000010948 carboxy methyl cellulose Nutrition 0.000 description 2
- 229910052804 chromium Inorganic materials 0.000 description 2
- 239000011651 chromium Substances 0.000 description 2
- 238000005336 cracking Methods 0.000 description 2
- 235000019425 dextrin Nutrition 0.000 description 2
- 229910003460 diamond Inorganic materials 0.000 description 2
- 239000010432 diamond Substances 0.000 description 2
- 229910052602 gypsum Inorganic materials 0.000 description 2
- 239000010440 gypsum Substances 0.000 description 2
- 229920003063 hydroxymethyl cellulose Polymers 0.000 description 2
- 229940031574 hydroxymethyl cellulose Drugs 0.000 description 2
- 238000002347 injection Methods 0.000 description 2
- 239000007924 injection Substances 0.000 description 2
- 238000009413 insulation Methods 0.000 description 2
- 230000007246 mechanism Effects 0.000 description 2
- 239000011259 mixed solution Substances 0.000 description 2
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 description 2
- 238000004806 packaging method and process Methods 0.000 description 2
- 238000003892 spreading Methods 0.000 description 2
- 230000007480 spreading Effects 0.000 description 2
- 229910001220 stainless steel Inorganic materials 0.000 description 2
- 239000010935 stainless steel Substances 0.000 description 2
- 238000012546 transfer Methods 0.000 description 2
- 238000009489 vacuum treatment Methods 0.000 description 2
- JLVVSXFLKOJNIY-UHFFFAOYSA-N Magnesium ion Chemical compound [Mg+2] JLVVSXFLKOJNIY-UHFFFAOYSA-N 0.000 description 1
- 239000006087 Silane Coupling Agent Substances 0.000 description 1
- 238000005054 agglomeration Methods 0.000 description 1
- 230000002776 aggregation Effects 0.000 description 1
- QQHSIRTYSFLSRM-UHFFFAOYSA-N alumanylidynechromium Chemical compound [Al].[Cr] QQHSIRTYSFLSRM-UHFFFAOYSA-N 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 239000001110 calcium chloride Substances 0.000 description 1
- 229910001628 calcium chloride Inorganic materials 0.000 description 1
- 239000008112 carboxymethyl-cellulose Substances 0.000 description 1
- 239000004568 cement Substances 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 238000010668 complexation reaction Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000007580 dry-mixing Methods 0.000 description 1
- 238000010891 electric arc Methods 0.000 description 1
- 238000007676 flexural strength test Methods 0.000 description 1
- 238000007656 fracture toughness test Methods 0.000 description 1
- 238000007602 hot air drying Methods 0.000 description 1
- 239000004615 ingredient Substances 0.000 description 1
- 229910001425 magnesium ion Inorganic materials 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 238000005498 polishing Methods 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
- 239000011734 sodium Substances 0.000 description 1
- 239000003381 stabilizer Substances 0.000 description 1
- 238000005728 strengthening Methods 0.000 description 1
- 230000008646 thermal stress Effects 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
- 238000005303 weighing Methods 0.000 description 1
- RUDFQVOCFDJEEF-UHFFFAOYSA-N yttrium(III) oxide Inorganic materials [O-2].[O-2].[O-2].[Y+3].[Y+3] RUDFQVOCFDJEEF-UHFFFAOYSA-N 0.000 description 1
- 229910052845 zircon Inorganic materials 0.000 description 1
- GFQYVLUOOAAOGM-UHFFFAOYSA-N zirconium(iv) silicate Chemical compound [Zr+4].[O-][Si]([O-])([O-])[O-] GFQYVLUOOAAOGM-UHFFFAOYSA-N 0.000 description 1
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- Compositions Of Oxide Ceramics (AREA)
Abstract
The application relates to the field of steel continuous casting, and particularly discloses a durable zirconium tundish nozzle and a preparation method thereof. The durable zirconium tundish nozzle comprises a ceramic inner liner and a refractory outer sleeve; the ceramic lining comprises the following substances in parts by weight: 10-60 parts of composite zirconia, 35-90 parts of monoclinic phase zirconia, 2-17 parts of alpha-Al 2O3 micro powder, 1-11 parts of silicon carbide micro powder, 1-3 parts of boron nitride micro powder, 3 parts of calcium oxide micro powder, 0.5-6 parts of magnesium oxide micro powder and 1-2 parts of yttrium oxide micro powder; the fireproof material jacket comprises the following substances in parts by weight: 40-80 parts of high bauxite and 10-30 parts of titanium iron slag. The preparation method comprises the following steps: s1, preparing a ceramic lining; s2, preparing the fireproof material jacket. The durable zirconium tundish nozzle can be used in steel continuous casting equipment, and has excellent thermal shock resistance and erosion resistance.
Description
Technical Field
The application relates to the technical field of continuous casting of steel, in particular to a durable zirconium tundish nozzle and a preparation method thereof.
Background
When molten steel is continuously cast, the molten steel flows into the crystallizer through the water gap of the tundish, is cooled into steel billets and is pulled away by the traction machine, and simultaneously, the molten steel continuously flows into the crystallizer through the water gap of the tundish. In this process, molten steel continuously impacts the ladle nozzle, so that the tundish nozzle is required to have the property of resisting molten steel erosion. And the molten steel is required to be unable to burst when passing through the tundish nozzle, and the nozzle core is required to have high thermal shock resistance.
At present, the tundish nozzle is poor in thermal shock resistance and erosion resistance, so that the tundish nozzle is short in service life and needs to be replaced frequently, the consumable cost is high, production is required to be suspended in the replacement process, a part of steel materials can be abandoned, and the productivity and the operation rate of a continuous casting machine and the molten steel yield are difficult to be improved.
Disclosure of Invention
In order to improve the defects of poor thermal shock resistance and erosion resistance of the tundish nozzle and prolong the service life of the tundish nozzle, the application provides a durable zirconium tundish nozzle and a preparation method thereof.
The application provides a durable zirconium tundish nozzle, which adopts the following technical scheme:
in a first aspect, the present application provides a durable zirconia tundish nozzle comprising a ceramic liner and a refractory casing; the ceramic lining comprises the following substances in parts by weight: 10-60 parts of composite zirconia, 35-90 parts of monoclinic phase zirconia, 2-17 parts of alpha-Al 2O3 micro powder, 1-11 parts of silicon carbide micro powder, 1-3 parts of boron nitride micro powder, 3 parts of calcium oxide micro powder, 0.5-6 parts of magnesium oxide micro powder and 1-2 parts of yttrium oxide micro powder; the fireproof material jacket comprises the following substances in parts by weight: 40-80 parts of high bauxite and 10-30 parts of titanium iron slag.
Optionally, the ceramic lining comprises the following substances in parts by weight: 10-60 parts of composite zirconia, 35-90 parts of monoclinic phase zirconia, 2-17 parts of alpha-Al 2O3 micro powder, 1-11 parts of silicon carbide micro powder, 1-3 parts of boron nitride micro powder, 3 parts of calcium oxide micro powder, 0.9-4.2 parts of magnesium oxide micro powder and 1-2 parts of yttrium oxide micro powder.
Optionally, the ceramic liner further comprises 1-3 parts of aluminum titanate fibers.
Optionally, the preparation method of the aluminum titanate fiber comprises the following steps: respectively taking titanium tetrachloride, anhydrous aluminum chloride, deionized water, acetylacetone and triethylamine according to a molar ratio of 1:2:3:3-4:10, respectively dispersing the titanium tetrachloride, the anhydrous aluminum chloride, the acetylacetone and the triethylamine in anhydrous methanol, mixing a titanium tetrachloride solution with an aluminum chloride solution to obtain a solution A, adding distilled water, an acetylacetone solution and a triethylamine solution into the solution A, stirring and mixing, concentrating under reduced pressure, and drying to obtain solid powder; mixing the solid powder with acetone, carrying out suction filtration, retaining filtrate, and carrying out reduced pressure distillation to obtain a precursor; preparing a precursor spinning solution, carrying out electrostatic spinning and sintering heat treatment to obtain the aluminum titanate fiber.
By adopting the technical scheme, the addition amount of the acetylacetone is optimized, and the proper addition amount of the acetylacetone can lead the acetylacetone to be enough to carry out complexation reaction with aluminum ions and titanium ions, reduce the generation and agglomeration of nonlinear structures and lead the precursor to have better spinnability.
Optionally, the composite zirconia comprises 9-50 parts of stabilized zirconia and 1-10 parts of hollow zirconia.
Optionally, the preparation method of the hollow zirconia comprises the following steps: adding sodium carboxymethyl cellulose solution into calcium chloride solution under ultrasonic oscillation to react, adding sodium carbonate solution, centrifuging the obtained mixture, washing, and drying at room temperature to obtain a template; dispersing the template in ethanol, performing ultrasonic dispersion, adding polyoxyethylene lauryl and zirconium n-butoxide, stirring for reaction, performing centrifugal separation, retaining solid matters, washing, drying, heating for reinforcement, dissolving in hydrochloric acid, performing centrifugal separation again, retaining solid matters, drying, and calcining to obtain the hollow zirconia.
By adopting the technical scheme, in the process of preparing the hollow zirconia, the polyoxyethylene lauryl is added as the mesoporous agent, so that the hollow zirconia can be formed into a porous material with a hollow structure. After sintering, hollow zirconia can still form a closed heat-insulating and shock-absorbing pore structure in the ceramic lining through solid solution reaction. Meanwhile, the porous structure can increase the bonding points of the hollow zirconia and the rest of components in the ceramic lining, so that the bonding strength of the hollow zirconia and the rest of components in the ceramic lining is improved. The carboxymethyl cellulose, calcium chloride and sodium carbonate are matched to serve as templates, and finally the prepared hollow zirconia is spherical zirconia, so that the hollow zirconia can be uniformly dispersed in the ceramic lining, and the heat insulation and thermal shock resistance effects of the ceramic lining are stably improved.
Optionally, the aluminum titanate fibers are supported on the hollow zirconia.
Optionally, the ceramic liner further comprises 0.5-1 part of metallic chromium powder.
By adopting the technical proposal, the utility model has the advantages that,
In a second aspect, the application provides a preparation method of a durable zirconium tundish nozzle, which adopts the following technical scheme:
a preparation method of a durable zirconium tundish nozzle comprises the following steps:
s1, preparing a ceramic lining:
S11, batching and premixing: adding composite zirconia, monoclinic phase zirconia, alpha-Al 2O3 micro powder, silicon carbide micro powder, boron nitride micro powder, calcium oxide micro powder, magnesium oxide micro powder and yttrium oxide micro powder into a homomixer according to weight parts for premixing to obtain a premixed batch;
S12, grinding and pulping: filling the premixed batch into a high-speed ball mill with a zirconia lining, adding deionized water, and grinding to obtain slurry;
S13, molding: the molding mode is one of a coagulation injection molding method, a grouting molding method, a pressurizing vibration molding method and an isostatic pressing molding method;
S14, drying the green body: forced drying by using a forced air drying kiln, wherein the water content of the dried blank is less than 0.1%;
S15, sintering: sintering by using a high-temperature box furnace or a tunnel type high-temperature kiln with a high-temperature silicon molybdenum rod as a heating body, wherein the highest sintering temperature is 1520-1760 ℃, the heating rate is 4-8 ℃/h, the heat preservation time is not less than 6 hours at the highest temperature, and the ceramic lining is prepared by processing, grinding and coating with surface paint;
S2, preparing a fireproof material jacket: the raw materials are put into a stirrer according to the weight portions, dry-mixed for 5-10 minutes, stirred for 20-60 minutes by adding water, discharged, molded, dried, inspected and packaged.
Optionally, the step S11 further includes step S111: taking half weight of composite zirconia and half weight of alpha-Al 2O3 micro powder, placing the composite zirconia and the half weight of alpha-Al 2O3 micro powder into a high-temperature arc furnace for melting to obtain a prefabricated product, and crushing the prefabricated product to obtain the graded particles with the particle size of 50-300 mu m.
By adopting the technical scheme, the composite zirconia and the alpha-Al 2O3 micro powder are prepared into the particle-graded prefabricated product in advance, and the graded particles are introduced into the ceramic lining, so that the unsealed pores in the ceramic lining can be effectively filled, and the density of the ceramic lining is improved. Meanwhile, the smaller graded particles can play a role of balls in the ceramic lining, so that the dispersion uniformity of each component in the ceramic lining is improved, and the ceramic lining can obtain uniform strength.
In summary, the application has the following beneficial effects:
1. According to the application, aluminum titanate fibers are added into the ceramic lining, a fiber network structure is introduced into the ceramic lining, and the rest components in the ceramic lining are networked, so that the bonding strength among the components of the ceramic lining is further improved, and the compactness and toughness of the ceramic lining are improved. The aluminum titanate fiber has anisotropy in thermal expansion, so that when the ceramic lining is impacted by rapid cooling and rapid heating, the wide grain boundary microcracks in the aluminum titanate fiber can effectively absorb energy, and an energy absorption network can be formed in the ceramic lining, so that the thermal stress in the ceramic lining is effectively reduced.
2. According to the application, hollow zirconia is added into the composite zirconia, and after sintering, closed air holes can be introduced into the ceramic lining, so that a heat blocking structure is formed, and the heat insulation effect of the ceramic lining is improved; in addition, the closed pore structure can also absorb energy, so that the thermal shock resistance effect of the ceramic lining is improved.
3. According to the application, the aluminum titanate fibers are loaded on the hollow zirconia, so that the specific surface area of the hollow zirconia can be increased, and the bonding strength of the hollow zirconia and the rest components in the ceramic lining can be improved. The hollow zirconia can also be used as an anchoring site in a network structure of interweaving aluminum titanate fibers, and a spherical fixing structure is introduced into a fiber network, so that the impact strength of the fiber network can be increased; meanwhile, the hollow mechanism of the hollow zirconia can also absorb heat transferred by the fibers, so that the thermal shock resistance effect of the ceramic lining is further improved.
4. According to the application, the metal chromium powder is added into the ceramic lining, and the metal chromium can generate volume expansion at high temperature, so that partial air holes in the ceramic lining are filled, and the density of the ceramic lining is improved. In addition, the metal chromium can be in solid solution with the alumina to form an aluminum-chromium solid solution, so that the bonding strength among all components in the ceramic lining is improved, and meanwhile, an anchor point can be formed in the ceramic lining, so that the erosion resistance effect of the ceramic lining is effectively improved.
Drawings
FIG. 1 is a schematic view of the construction of a durable zirconium tundish nozzle according to the present application.
Reference numerals: 1. a ceramic liner; 2. a refractory jacket.
Detailed Description
The present application will be described in further detail with reference to examples.
Preparation example
Preparation example of aluminum titanate fiber
Preparation example 1
Respectively taking titanium tetrachloride, anhydrous aluminum chloride, deionized water, acetylacetone and triethylamine according to a molar ratio of 1:2:3:3:10, respectively dispersing the titanium tetrachloride, the anhydrous aluminum chloride, the acetylacetone and the triethylamine in anhydrous methanol to obtain titanium tetrachloride solution, aluminum oxide solution, acetylacetone solution and triethylamine solution, adding the anhydrous aluminum chloride methanol solution into the stirring titanium tetrachloride methanol solution under the ice bath condition of 5-10 ℃, continuously magnetically stirring for 30min after the solution is mixed to obtain solution A, sequentially adding distilled water, acetylacetone solution and triethylamine solution into the solution A, continuously stirring for 12h to obtain mixed solution, concentrating under reduced pressure at 40 ℃, and drying to obtain solid powder; mixing solid powder with acetone according to a mass ratio of 1:10, mixing, filtering, retaining filtrate, and distilling under reduced pressure at 32 ℃ to obtain a precursor; preparing a precursor spinning solution from a precursor, absolute ethyl alcohol and polyethylene oxide according to a mass ratio of 100:200:1, and carrying out electrostatic spinning under the following conditions: the voltage is 12kV; the pushing speed of the injection pump is 1.5mL/h; the needle head adopts a No. 5 stainless steel needle head; the collection distance is 20cm; the ambient temperature is 20-40 ℃; the relative humidity is 20-40%. Under the air condition, the temperature rising rate of 1 ℃/min is increased to 600 ℃ and the heat is preserved for 1h, then the temperature rising rate of 2 ℃/min is increased to 1500 ℃, and the heat is preserved for 2h for sintering heat treatment, thus obtaining the aluminum titanate fiber 1.
Preparation example 2
Respectively taking titanium tetrachloride, anhydrous aluminum chloride, deionized water, acetylacetone and triethylamine according to a molar ratio of 1:2:3:4:10, respectively dispersing the titanium tetrachloride, the anhydrous aluminum chloride, the acetylacetone and the triethylamine in anhydrous methanol to obtain titanium tetrachloride solution, aluminum oxide solution, acetylacetone solution and triethylamine solution, adding the anhydrous aluminum chloride methanol solution into the stirring titanium tetrachloride methanol solution under the ice bath condition of 5-10 ℃, continuously magnetically stirring for 30min after the solution is mixed to obtain solution A, sequentially adding distilled water, acetylacetone solution and triethylamine solution into the solution A, continuously stirring for 12h to obtain mixed solution, concentrating under reduced pressure at 40 ℃, and drying to obtain solid powder; mixing solid powder with acetone according to a mass ratio of 1:10, mixing, filtering, retaining filtrate, and distilling under reduced pressure at 32 ℃ to obtain a precursor; preparing a precursor spinning solution from a precursor, absolute ethyl alcohol and polyethylene oxide according to a mass ratio of 100:200:1, and carrying out electrostatic spinning under the following conditions: the voltage is 12kV; the pushing speed of the injection pump is 1.5mL/h; the needle head adopts a No. 5 stainless steel needle head; the collection distance is 20cm; the ambient temperature is 20-40 ℃; the relative humidity is 20-40%. Under the air condition, the temperature rising rate of 1 ℃/min is increased to 600 ℃ and the heat is preserved for 1h, then the temperature rising rate of 2 ℃/min is increased to 1500 ℃, and the heat is preserved for 2h for sintering heat treatment, thus obtaining the aluminum titanate fiber 2.
Preparation of hollow zirconia
Preparation example 3
1L of CMC solution with the mass fraction of 1% is added into 0.5L of CaCl 2 solution with the mass fraction of 0.1M, mixed for 20min under ultrasonic vibration, and added into 0.5L of Na 2CO3 solution with the mass fraction of 0.1M for reaction for 10min. The resulting mixture was centrifuged, washed, and dried at room temperature to obtain a template. Dispersing 0.05kg of template in 7L of ethanol, performing ultrasonic dispersion, adding 0.05L of deionized water, adding 0.1mL of polyoxyethylene lauryl and 0.05L of zirconium n-butoxide, stirring for reaction for 3h, performing centrifugal separation, retaining solid matters, washing, drying, heating at 200 ℃ for strengthening, dissolving in 2mol/Ld hydrochloric acid, performing centrifugal separation again, retaining solid matters, drying, and calcining at 600 ℃ for 2h to obtain hollow zirconia.
Preparation example 4
Mixing 0.1kg of hollow zirconia with 0.02kg of silane coupling agent KH550 to obtain a mixture, dispersing the mixture in ethanol to obtain a dispersion, adding 0.05kg of aluminum titanate fibers into the dispersion, ultrasonically dispersing, stirring and mixing, filtering, retaining solids, drying, and crushing to obtain the hollow zirconia loaded with the aluminum titanate fibers.
Preparation of composite zirconia
Preparation examples 5 to 7
Taking stable zirconia and hollow zirconia, and stirring and mixing to obtain composite zirconia 1-3. The stabilized zirconia is 60-80% stabilized zirconia.
TABLE 1 preparation examples 5-7 composite zirconia compositions
| Weight/kg | Preparation example 5 | Preparation example 6 | Preparation example 7 |
| Stabilized zirconia | 9 | 35 | 50 |
| Hollow zirconia | 1 | 5 | 10 |
Preparation example 8
The difference from preparation example 7 is that: the composite zirconia included 50kg of stabilized zirconia, 6kg of hollow zirconia, and 4kg of hollow alumina loaded with aluminum titanate fibers.
Examples
Examples 1 to 3
In one aspect, the application provides a durable zirconia tundish nozzle, comprising a ceramic inner liner and a refractory outer liner;
A ceramic liner comprising: composite zirconia, monoclinic phase zirconia, alpha-Al 2O3 micropowder, silicon carbide micropowder, boron nitride micropowder, calcium oxide micropowder, magnesium oxide micropowder and yttrium oxide micropowder, wherein the specific mass is shown in the following table; wherein the composite zirconia is composite zirconia 1 prepared in preparation example 5.
The fireproof material jacket comprises the following substances in parts by weight: 40kg of high bauxite, 10kg of titanium iron slag, 3kg of high temperature bonding agent and 0.3kg of water reducing agent; wherein the high-temperature bonding agent is high-alumina cement, the water reducing agent is silica micropowder, and the high-alumina bauxite is 80-88% high-alumina bauxite.
On the other hand, the application provides a preparation method of a durable zirconium tundish nozzle, which comprises the following steps:
s1, preparation of a zirconia ceramic lining:
S11, batching and premixing: adding composite zirconia, monoclinic phase zirconia, alpha-Al 2O3 micro powder, silicon carbide micro powder, boron nitride micro powder, calcium oxide micro powder, magnesium oxide micro powder and yttrium oxide micro powder into a homomixer according to parts by weight, and premixing for 20 minutes to obtain a premixed batch;
S12, grinding and pulping: preparing grouting slurry, loading the premixed batch into a high-speed ball mill with a zirconia lining, adding 2 parts by weight of polyvinyl alcohol, 0.5 part by weight of dextrin or hydroxymethyl cellulose, 150 parts by weight of deionized water and 100 parts by weight of zirconia grinding balls with the diameter of 5mm, and grinding and stirring at a grinding speed of 300 revolutions per minute for 30 minutes to obtain the slurry;
S13, molding: the grouting method is pressureless casting molding, the volume density of the produced product is lower than that of the pressurizing vibration molding method and isostatic pressing molding method by about 0.16-0.21g/cm 3 ,, and pores are easy to form in the molding process.
The casting method is adopted for molding, a gypsum mold is used for manufacturing a molding mold, and the setting of a mold firing shrinkage scale is 15%. Placing the mould into a vacuum box, carrying out vacuum stirring treatment on the prepared slurry for at least 30 minutes under the vacuum degree of-90 Kpa, and injecting the slurry after the vacuum treatment into the mould through a discharge pipe at the bottom of a slurry barrel. And (3) placing the die subjected to injection molding into a curing room with the temperature of 30 ℃ and the relative humidity of 80 percent for curing for 30 hours, and demolding to obtain the molded blank. The molded blank was maintained at 55% relative humidity for a further 30 hours and dried naturally. After naturally drying for 24 hours, forced drying was performed.
S14, drying the green body: forced drying is performed using a forced air drying kiln. The heating rates of the two temperature sections of 80-110 ℃ and 150-180 ℃ are not higher than 3 ℃/h, the highest drying temperature is set to 260 ℃, the high-temperature heat preservation time is not less than 4 hours, and the total drying time is controlled to 45 hours. The water content of the dried blank is less than 0.1%.
S15, sintering: sintering in a high-temperature box furnace or a tunnel type high-temperature kiln with a high-temperature silicon molybdenum rod as a heating element.
S15.1, uniformly spreading 8mm thick zirconia sand with granularity of 0.5mm on a kiln table, and then stably placing the ceramic blank on the zirconia sand in a solid state. When a plurality of kilns are installed, the interval distance between two adjacent kilns is required to be more than 30mm. The distance between the blank and the heating element is more than 30mm;
S15.2, setting the highest firing temperature at 1600 ℃, controlling the heating speed at 6 ℃/h, and keeping the temperature at the highest temperature for at least 6 hours;
s15.3, after the sintering is finished, naturally cooling, controlling the cooling speed to be not more than 15 ℃/h in the range of 1200-900 ℃, and discharging the kiln after the kiln temperature is reduced to below 200 ℃.
S16, processing and grinding: cutting the end of the sintered blank by using a diamond cutter for the part exceeding the standard size, wherein the end face is kept perpendicular to the axis during cutting; the sintered blank meeting the requirement of the appearance size does not need to be processed.
The ceramic lining can be integrally formed into an integral lining, and can also be assembled into a combined lining after being molded and sintered in a segmented mode according to equipment conditions and individuation requirements based on lining performance.
S17, coating: to reduce the heat transfer of the ceramic liner to the refractory jacket, the outer surface of the ceramic liner is coated with a low expansion, low thermal conductivity coating to prevent cracking of the jacket by thermal shock from the ceramic liner.
S2, preparing a fireproof material jacket:
S21, proportioning: adding 80-88% grade high-aluminum homogenized material or high-aluminum bauxite, high-temperature binding agent and water reducer into a stirrer according to parts by weight, dry-mixing for 10 minutes, adding water, stirring for 25 minutes, and discharging.
S22, product molding: and (3) adopting a steel die and using a vibrating table for casting molding. The zirconium lining is penetrated into the core for fixing, the bottom plate of the mould, the core and the outer sleeve are assembled together, and the mould is fixed in the clamping groove of the vibrating table by using the pressing strip for fixing together. And according to the product specification, starting the vibrating table to vibrate at high frequency for 10 seconds until the material surface is pulped. The temperature of the product forming site is kept at not lower than 20 ℃ so as to be beneficial to hardening of the casting material.
S23, curing and drying: after the product is hardened for 30 hours with a mould, demoulding, transferring the product into a curing room with the temperature of 25 ℃ and the humidity of 60%, curing for 40 hours, drying by using a hot air drying kiln, wherein the temperature rising speed of the temperature section of 80-110 ℃ is not higher than 3 ℃/hour, the highest drying temperature is set to 260 ℃, the high-temperature heat preservation time is not less than 4 hours, and the total drying time is controlled to be 30 hours. The water content of the dried blank is less than 0.1%. And (3) polishing and flattening the casting surface of the dried blank by using an angle grinder.
S24, checking and packaging: and (5) checking that the appearance size of the product meets the specification requirement, and packaging.
Table 2 examples 1-3 ceramic liner compositions
| Weight/kg | Example 1 | Example 2 | Example 3 |
| Composite zirconia | 10 | 45 | 60 |
| Monoclinic phase zirconia | 35 | 55 | 90 |
| Alpha-Al 2O3 micropowder | 2 | 15 | 17 |
| Silicon carbide micropowder | 1 | 5 | 11 |
| Boron nitride micropowder | 1 | 2 | 3 |
| Calcium oxide micropowder | 3 | 3 | 3 |
| Magnesium oxide micropowder | 0.9 | 2.5 | 4.2 |
| Yttria micropowder | 1 | 1.5 | 2 |
Example 4
The difference from example 2 is that: the ceramic liner also included 2kg of aluminum titanate fiber 1 prepared in preparation example 1.
Example 5
The difference from example 3 is that: the ceramic liner also included 2kg of aluminum titanate fibers 2 prepared in preparation example 2.
Example 6
The difference from example 2 is that: a ceramic liner was prepared using the composite zirconia 2 prepared in preparation example 6 of equal mass instead of the composite zirconia in example 2.
Example 7
The difference from example 2 is that: a ceramic liner was prepared using the composite zirconia 2 prepared in preparation example 7 of equal mass instead of the composite zirconia in example 2.
Example 8
The difference from example 2 is that: a ceramic liner was prepared using the composite zirconia 2 prepared in preparation example 8 of equal mass instead of the composite zirconia in example 2.
Example 9
The difference from example 4 is that: the ceramic liner also included 0.75kg of metallic chromium powder.
Example 10
The difference from example 2 is that: the application provides a preparation method of a durable zirconium tundish nozzle, which comprises the following steps:
s1, preparation of a zirconia ceramic lining:
S11, batching and premixing: respectively weighing composite zirconia, monoclinic zirconia, alpha-Al 2O3 micropowder, silicon carbide micropowder, boron nitride micropowder, calcium oxide micropowder, magnesium oxide micropowder and yttrium oxide micropowder;
S111, taking half of composite zirconia and half of alpha-Al 2O3 micro powder by weight, putting the composite zirconia and the half of alpha-Al 2O3 micro powder by weight into a high-temperature electric arc furnace, melting to obtain a prefabricated product, crushing to obtain graded particles with the particle size of 50-300 mu m, adding the graded particles, the rest composite zirconia, monoclinic phase zirconia, the rest alpha-Al 2O3 micro powder, silicon carbide micro powder, boron nitride micro powder, calcium oxide micro powder, magnesium oxide micro powder and yttrium oxide micro powder into a homomixer by weight, and premixing for 20 minutes to obtain a premixed batch;
S12, grinding and pulping: preparing grouting slurry, loading the premixed batch into a high-speed ball mill with a zirconia lining, adding 2 parts by weight of polyvinyl alcohol, 0.5 part by weight of dextrin or hydroxymethyl cellulose, 150 parts by weight of deionized water and 100 parts by weight of zirconia grinding balls with the diameter of 5mm, and grinding and stirring at a grinding speed of 300 revolutions per minute for 30 minutes to obtain the slurry;
S13, molding: the grouting method is pressureless casting molding, the volume density of the produced product is lower than that of the pressurizing vibration molding method and isostatic pressing molding method by about 0.16-0.21g/cm 3 ,, and pores are easy to form in the molding process.
The casting method is adopted for molding, a gypsum mold is used for manufacturing a molding mold, and the setting of a mold firing shrinkage scale is 15%. Placing the mould into a vacuum box, carrying out vacuum stirring treatment on the prepared slurry for at least 30 minutes under the vacuum degree of-90 Kpa, and injecting the slurry after the vacuum treatment into the mould through a discharge pipe at the bottom of a slurry barrel. And (3) placing the die subjected to injection molding into a curing room with the temperature of 30 ℃ and the relative humidity of 80 percent for curing for 30 hours, and demolding to obtain the molded blank. The molded blank was maintained at 55% relative humidity for a further 30 hours and dried naturally. After naturally drying for 24 hours, forced drying was performed.
S14, drying the green body: forced drying is performed using a forced air drying kiln. The heating rates of the two temperature sections of 80-110 ℃ and 150-180 ℃ are not higher than 3 ℃/h, the highest drying temperature is set to 260 ℃, the high-temperature heat preservation time is not less than 4 hours, and the total drying time is controlled to 45 hours. The water content of the dried blank is less than 0.1%.
S15, sintering: sintering in a high-temperature box furnace or a tunnel type high-temperature kiln with a high-temperature silicon molybdenum rod as a heating element.
S15.1, uniformly spreading 8mm thick zirconia sand with granularity of 0.5mm on a kiln table, and then stably placing the ceramic blank on the zirconia sand in a solid state. When a plurality of kilns are installed, the interval distance between two adjacent kilns is required to be more than 30mm. The distance between the blank and the heating element is more than 30mm;
S15.2, setting the highest firing temperature at 1600 ℃, controlling the heating speed at 6 ℃/h, and keeping the temperature at the highest temperature for at least 6 hours;
s15.3, after the sintering is finished, naturally cooling, controlling the cooling speed to be not more than 15 ℃/h in the range of 1200-900 ℃, and discharging the kiln after the kiln temperature is reduced to below 200 ℃.
S16, processing and grinding: cutting the end of the sintered blank by using a diamond cutter for the part exceeding the standard size, wherein the end face is kept perpendicular to the axis during cutting; the sintered blank meeting the requirement of the appearance size does not need to be processed.
The ceramic lining can be integrally formed into an integral lining, and can also be assembled into a combined lining after being molded and sintered in a segmented mode according to equipment conditions and individuation requirements based on lining performance.
S17, coating: to reduce the heat transfer of the ceramic liner to the refractory jacket, the outer surface of the ceramic liner is coated with a low expansion, low thermal conductivity coating to prevent cracking of the jacket by thermal shock from the ceramic liner.
Example 11
The difference from example 2 is that: the refractory jacket comprises 60kg of bauxite, 20kg of titanium slag, 7kg of high temperature binder and 0.8kg of water reducing agent.
Example 12
The difference from example 2 is that: the refractory jacket comprises 80kg of high bauxite, 30kg of titanium slag, 8kg of high temperature binder and 3kg of water reducing agent.
Comparative example
Comparative example 1
The present comparative example is different from example 3 in that the composite zirconia in the present comparative example includes only stabilized zirconia.
Comparative example 2
This comparative example differs from example 3 in that the ceramic liner in this comparative example includes: 20kg of industrial zirconia, 40kg of stabilized zirconia and 10kg of zircon sand, 4-grade ingredients are adopted, and the granularity of the main raw materials is generally 100#; the monoclinic zirconium stabilizer/sintering aid was 2kg of yttrium oxide and the binder was 5kg of polyvinyl alcohol.
Performance test
1. Shock resistance test
And (3) testing the thermal shock resistance of the test sample according to GB/T30879-2014.
2. Compressive Strength test
According to GB/T5072-2008, the normal temperature compressive strength of the sample is detected by using an AG-Xplus type universal testing machine with the loading rate of 1 MPa/s.
3. Flexural Strength test
The bending strength at room temperature and the bending strength at 1450℃of the sample were measured in accordance with GB/T6569-2006.
4. Fracture toughness test
The fracture toughness of the test specimens was measured according to GB/T23806-2009.
5. Service life test
The test sample is applied to continuous casting, steel grade-HRB 400 is adopted, the average pulling speed is 2.6m/min, the square billet specification is 150mm by 150mm, the tundish temperature is 1535 ℃, and the service time when the test sample is damaged is recorded.
Table 3 performance test table
The comparison of performance tests in combination with Table 3 can be found:
1. it can be found in combination with examples 1-3 and comparative examples 1-2 that: the strength, thermal shock resistance and service life of the samples prepared in examples 1-3 are all improved, which means that the addition amount of magnesium oxide micro powder is optimized in the application, so that magnesium ions can fully replace zirconium ions, repulsive force among local oxygen is reduced, lattice distortion is caused, lattice energy is activated, sintering temperature is reduced, and a plurality of solid solutions are formed in a ceramic lining; meanwhile, the transformation of the zirconia crystal form is inhibited, the crystal grain shape is optimized, the bonding strength among crystal grains is improved, and the density and the stability of the ceramic lining are improved.
2. It can be found in combination with examples 4 to 5, examples 6 to 7, and examples 8 and 2 that: the strength, thermal shock resistance and service life of the samples prepared in examples 4-8 are all improved, which shows that the introduction of aluminum titanate fibers in the application can introduce fiber networks with energy absorption effect into the ceramic lining, thereby improving the density of the ceramic lining and improving the thermal shock resistance of the ceramic lining. Aluminum titanate fibers are loaded on hollow zirconia, so that the hollow zirconia is used as an anchoring site in a network structure of interweaving the aluminum titanate fibers, and the impact strength of a fiber network is improved; and the hollow mechanism of the hollow zirconia can also absorb the heat transferred by the fibers, thereby further improving the thermal shock resistance effect of the ceramic lining.
3. It can be found in combination with examples 9 to 10 and example 2 that: the samples prepared in examples 9-10 all have improved strength, thermal shock resistance and service life, which indicates that the introduction of graded particles into the ceramic lining can effectively fill the unsealed pores in the ceramic lining and improve the compactness of the ceramic lining. Meanwhile, the smaller graded particles can play a role of balls in the ceramic lining, so that the dispersion uniformity of each component in the ceramic lining is improved, and the ceramic lining can obtain uniform strength.
The present embodiment is only for explanation of the present application and is not to be construed as limiting the present application, and modifications to the present embodiment, which may not creatively contribute to the present application as required by those skilled in the art after reading the present specification, are all protected by patent laws within the scope of claims of the present application.
Claims (9)
1. The durable zirconium tundish nozzle is characterized by comprising a ceramic inner liner and a refractory outer sleeve;
The ceramic lining comprises the following substances in parts by weight: 10-60 parts of composite zirconia, 35-90 parts of monoclinic phase zirconia, 2-17 parts of alpha-Al 2O3 micro powder, 1-11 parts of silicon carbide micro powder, 1-3 parts of boron nitride micro powder, 3 parts of calcium oxide micro powder, 0.5-6 parts of magnesium oxide micro powder and 1-2 parts of yttrium oxide micro powder;
the fireproof material jacket comprises the following substances in parts by weight: 40-80 parts of high bauxite and 10-30 parts of titanium iron slag.
2. A durable zirconia tundish nozzle according to claim 1, wherein: the ceramic liner further comprises 1-3 parts of aluminum titanate fibers.
3. A durable zirconia tundish nozzle according to claim 2, wherein: the preparation method of the aluminum titanate fiber comprises the following steps: respectively taking titanium tetrachloride, anhydrous aluminum chloride, deionized water, acetylacetone and triethylamine according to a molar ratio of 1:2:3:3-4:10, respectively dispersing the titanium tetrachloride, the anhydrous aluminum chloride, the acetylacetone and the triethylamine in anhydrous methanol, mixing a titanium tetrachloride solution with an aluminum chloride solution to obtain a solution A, adding distilled water, an acetylacetone solution and a triethylamine solution into the solution A, stirring and mixing, concentrating under reduced pressure, and drying to obtain solid powder; mixing the solid powder with acetone, carrying out suction filtration, retaining filtrate, and carrying out reduced pressure distillation to obtain a precursor; preparing a precursor spinning solution, carrying out electrostatic spinning and sintering heat treatment to obtain the aluminum titanate fiber.
4. A durable zirconia tundish nozzle according to claim 2, wherein: the composite zirconia comprises 9-50 parts of stabilized zirconia and 1-10 parts of hollow zirconia.
5. A durable zirconia tundish nozzle according to claim 4, wherein: the preparation method of the hollow zirconia comprises the following steps: adding sodium carboxymethyl cellulose solution into calcium chloride solution under ultrasonic oscillation to react, adding sodium carbonate solution, centrifuging the obtained mixture, washing, and drying at room temperature to obtain a template; dispersing the template in ethanol, performing ultrasonic dispersion, adding polyoxyethylene lauryl and zirconium n-butoxide, stirring for reaction, performing centrifugal separation, retaining solid matters, washing, drying, heating for reinforcement, dissolving in hydrochloric acid, performing centrifugal separation again, retaining solid matters, drying, and calcining to obtain the hollow zirconia.
6. A durable zirconia tundish nozzle as in claim 55, wherein: the aluminum titanate fibers are supported on the hollow zirconia.
7. A durable zirconia tundish nozzle according to claim 2, wherein: the ceramic lining also comprises 0.5-1 part of metal chromium powder.
8. A method of producing a durable zirconia tundish nozzle according to any one of claims 1 to 7, comprising the steps of:
s1, preparing a ceramic lining:
S11, batching and premixing: adding composite zirconia, monoclinic phase zirconia, alpha-Al 2O3 micro powder, silicon carbide micro powder, boron nitride micro powder, calcium oxide micro powder, magnesium oxide micro powder and yttrium oxide micro powder into a homomixer according to weight parts for premixing to obtain a premixed batch;
S12, grinding and pulping: filling the premixed batch into a high-speed ball mill with a zirconia lining, adding deionized water, and grinding to obtain slurry;
S13, molding: the molding mode is one of a coagulation injection molding method, a grouting molding method, a pressurizing vibration molding method and an isostatic pressing molding method;
S14, drying the green body: forced drying by using a forced air drying kiln, wherein the water content of the dried blank is less than 0.1%;
S15, sintering: sintering by using a high-temperature box furnace or a tunnel type high-temperature kiln with a high-temperature silicon molybdenum rod as a heating body, wherein the highest sintering temperature is 1520-1760 ℃, the heating rate is 4-8 ℃/h, the heat preservation time is not less than 6 hours at the highest temperature, and the ceramic lining is prepared by processing, grinding and coating with surface paint;
S2, preparing a fireproof material jacket: the raw materials are put into a stirrer according to the weight portions, dry-mixed for 5-10 minutes, stirred for 20-60 minutes by adding water, discharged, molded, dried, inspected and packaged.
9. The method for preparing the durable zirconium tundish nozzle according to claim 8, which is characterized in that: the step S11 further includes a step S111: taking half weight of composite zirconia and half weight of alpha-Al 2O3 micro powder, placing the composite zirconia and the half weight of alpha-Al 2O3 micro powder into a high-temperature arc furnace for melting to obtain a prefabricated product, and crushing the prefabricated product to obtain the graded particles with the particle size of 50-300 mu m.
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