CN118145967A - High-temperature sintered magnesia-zirconia sliding brick added with titanium reinforced corundum and production method thereof - Google Patents
High-temperature sintered magnesia-zirconia sliding brick added with titanium reinforced corundum and production method thereof Download PDFInfo
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- CN118145967A CN118145967A CN202410265270.9A CN202410265270A CN118145967A CN 118145967 A CN118145967 A CN 118145967A CN 202410265270 A CN202410265270 A CN 202410265270A CN 118145967 A CN118145967 A CN 118145967A
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- Prior art keywords
- zirconia
- equal
- granularity
- corundum
- sintered magnesia
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- MCMNRKCIXSYSNV-UHFFFAOYSA-N ZrO2 Inorganic materials O=[Zr]=O MCMNRKCIXSYSNV-UHFFFAOYSA-N 0.000 title claims abstract description 61
- 239000011449 brick Substances 0.000 title claims abstract description 58
- 229910052593 corundum Inorganic materials 0.000 title claims abstract description 55
- 239000010431 corundum Substances 0.000 title claims abstract description 49
- 239000010936 titanium Substances 0.000 title claims abstract description 40
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 title claims abstract description 38
- 229910052719 titanium Inorganic materials 0.000 title claims abstract description 38
- 238000004519 manufacturing process Methods 0.000 title abstract description 10
- CPLXHLVBOLITMK-UHFFFAOYSA-N Magnesium oxide Chemical compound [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 claims abstract description 78
- 239000000395 magnesium oxide Substances 0.000 claims abstract description 39
- 239000002994 raw material Substances 0.000 claims abstract description 27
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims abstract description 25
- 229910052710 silicon Inorganic materials 0.000 claims abstract description 24
- 239000010703 silicon Substances 0.000 claims abstract description 24
- SNAAJJQQZSMGQD-UHFFFAOYSA-N aluminum magnesium Chemical compound [Mg].[Al] SNAAJJQQZSMGQD-UHFFFAOYSA-N 0.000 claims abstract description 16
- 239000013078 crystal Substances 0.000 claims abstract description 16
- 239000000843 powder Substances 0.000 claims abstract description 15
- 229910000838 Al alloy Inorganic materials 0.000 claims abstract description 13
- KXGFMDJXCMQABM-UHFFFAOYSA-N 2-methoxy-6-methylphenol Chemical compound [CH]OC1=CC=CC([CH])=C1O KXGFMDJXCMQABM-UHFFFAOYSA-N 0.000 claims abstract description 12
- 239000005011 phenolic resin Substances 0.000 claims abstract description 12
- 229920001568 phenolic resin Polymers 0.000 claims abstract description 12
- 229910021487 silica fume Inorganic materials 0.000 claims abstract description 9
- 229920001187 thermosetting polymer Polymers 0.000 claims abstract description 9
- 238000003723 Smelting Methods 0.000 claims abstract description 8
- 239000010426 asphalt Substances 0.000 claims abstract description 7
- 239000011230 binding agent Substances 0.000 claims abstract description 6
- 235000019580 granularity Nutrition 0.000 claims description 46
- 239000002245 particle Substances 0.000 claims description 22
- 238000000034 method Methods 0.000 claims description 19
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 13
- 229910052751 metal Inorganic materials 0.000 claims description 13
- 239000002184 metal Substances 0.000 claims description 13
- 238000001035 drying Methods 0.000 claims description 12
- 229910004298 SiO 2 Inorganic materials 0.000 claims description 8
- 238000010304 firing Methods 0.000 claims description 8
- 229910052681 coesite Inorganic materials 0.000 claims description 7
- 229910052906 cristobalite Inorganic materials 0.000 claims description 7
- 239000000377 silicon dioxide Substances 0.000 claims description 7
- 229910052682 stishovite Inorganic materials 0.000 claims description 7
- 229910052905 tridymite Inorganic materials 0.000 claims description 7
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 claims description 6
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims description 6
- 238000007598 dipping method Methods 0.000 claims description 6
- 238000010438 heat treatment Methods 0.000 claims description 6
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 claims description 6
- 238000002156 mixing Methods 0.000 claims description 6
- 238000003756 stirring Methods 0.000 claims description 6
- 229910001845 yogo sapphire Inorganic materials 0.000 claims description 6
- 238000000137 annealing Methods 0.000 claims description 5
- 239000011248 coating agent Substances 0.000 claims description 5
- 238000000576 coating method Methods 0.000 claims description 5
- 238000000227 grinding Methods 0.000 claims description 5
- 238000007654 immersion Methods 0.000 claims description 5
- 239000012299 nitrogen atmosphere Substances 0.000 claims description 5
- 239000003921 oil Substances 0.000 claims description 5
- 239000011777 magnesium Substances 0.000 claims description 4
- 229910000519 Ferrosilicon Inorganic materials 0.000 claims description 3
- KKCBUQHMOMHUOY-UHFFFAOYSA-N Na2O Inorganic materials [O-2].[Na+].[Na+] KKCBUQHMOMHUOY-UHFFFAOYSA-N 0.000 claims description 3
- 102220043159 rs587780996 Human genes 0.000 claims description 3
- 239000002912 waste gas Substances 0.000 claims description 3
- 238000005303 weighing Methods 0.000 claims description 3
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 claims description 2
- 229910052782 aluminium Inorganic materials 0.000 claims description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 2
- 239000008187 granular material Substances 0.000 claims description 2
- 229910052749 magnesium Inorganic materials 0.000 claims description 2
- 239000003517 fume Substances 0.000 claims 1
- 229910000831 Steel Inorganic materials 0.000 abstract description 20
- 239000010959 steel Substances 0.000 abstract description 20
- 229910052799 carbon Inorganic materials 0.000 abstract description 12
- 230000003628 erosive effect Effects 0.000 abstract description 12
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 abstract description 11
- 230000035939 shock Effects 0.000 abstract description 10
- 229910052791 calcium Inorganic materials 0.000 abstract description 5
- 239000011575 calcium Substances 0.000 abstract description 5
- 238000001816 cooling Methods 0.000 abstract description 5
- 230000014759 maintenance of location Effects 0.000 abstract description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract description 5
- 230000003647 oxidation Effects 0.000 abstract description 3
- 238000007254 oxidation reaction Methods 0.000 abstract description 3
- 229910001209 Low-carbon steel Inorganic materials 0.000 abstract description 2
- 238000005336 cracking Methods 0.000 abstract description 2
- 229920005989 resin Polymers 0.000 abstract description 2
- 239000011347 resin Substances 0.000 abstract description 2
- 235000012245 magnesium oxide Nutrition 0.000 description 29
- 239000000463 material Substances 0.000 description 7
- 238000005245 sintering Methods 0.000 description 6
- RWDBMHZWXLUGIB-UHFFFAOYSA-N [C].[Mg] Chemical compound [C].[Mg] RWDBMHZWXLUGIB-UHFFFAOYSA-N 0.000 description 3
- 239000001095 magnesium carbonate Substances 0.000 description 3
- 235000014380 magnesium carbonate Nutrition 0.000 description 3
- ZLNQQNXFFQJAID-UHFFFAOYSA-L magnesium carbonate Chemical compound [Mg+2].[O-]C([O-])=O ZLNQQNXFFQJAID-UHFFFAOYSA-L 0.000 description 3
- 229910000021 magnesium carbonate Inorganic materials 0.000 description 3
- VTHJTEIRLNZDEV-UHFFFAOYSA-L magnesium dihydroxide Chemical compound [OH-].[OH-].[Mg+2] VTHJTEIRLNZDEV-UHFFFAOYSA-L 0.000 description 3
- 239000000347 magnesium hydroxide Substances 0.000 description 3
- 229910001862 magnesium hydroxide Inorganic materials 0.000 description 3
- QRNPTSGPQSOPQK-UHFFFAOYSA-N magnesium zirconium Chemical compound [Mg].[Zr] QRNPTSGPQSOPQK-UHFFFAOYSA-N 0.000 description 3
- 238000002844 melting Methods 0.000 description 3
- 238000005121 nitriding Methods 0.000 description 3
- 239000011148 porous material Substances 0.000 description 3
- 238000004321 preservation Methods 0.000 description 3
- 239000011819 refractory material Substances 0.000 description 3
- 229910000617 Mangalloy Inorganic materials 0.000 description 2
- 229910000861 Mg alloy Inorganic materials 0.000 description 2
- 229910020068 MgAl Inorganic materials 0.000 description 2
- 238000002441 X-ray diffraction Methods 0.000 description 2
- RQMIWLMVTCKXAQ-UHFFFAOYSA-N [AlH3].[C] Chemical compound [AlH3].[C] RQMIWLMVTCKXAQ-UHFFFAOYSA-N 0.000 description 2
- -1 aluminum zirconium carbon Chemical compound 0.000 description 2
- 239000012267 brine Substances 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 238000009749 continuous casting Methods 0.000 description 2
- 229910052839 forsterite Inorganic materials 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 230000003014 reinforcing effect Effects 0.000 description 2
- 239000002893 slag Substances 0.000 description 2
- 239000000779 smoke Substances 0.000 description 2
- HPALAKNZSZLMCH-UHFFFAOYSA-M sodium;chloride;hydrate Chemical compound O.[Na+].[Cl-] HPALAKNZSZLMCH-UHFFFAOYSA-M 0.000 description 2
- 239000006104 solid solution Substances 0.000 description 2
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 1
- 229910001200 Ferrotitanium Inorganic materials 0.000 description 1
- BPQQTUXANYXVAA-UHFFFAOYSA-N Orthosilicate Chemical compound [O-][Si]([O-])([O-])[O-] BPQQTUXANYXVAA-UHFFFAOYSA-N 0.000 description 1
- QCWXUUIWCKQGHC-UHFFFAOYSA-N Zirconium Chemical compound [Zr] QCWXUUIWCKQGHC-UHFFFAOYSA-N 0.000 description 1
- 229910021486 amorphous silicon dioxide Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000001354 calcination Methods 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 238000000748 compression moulding Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000002050 diffraction method Methods 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 229910052748 manganese Inorganic materials 0.000 description 1
- 239000011572 manganese Substances 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 238000005272 metallurgy Methods 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 230000009257 reactivity Effects 0.000 description 1
- 230000002787 reinforcement Effects 0.000 description 1
- 238000009991 scouring Methods 0.000 description 1
- 239000011863 silicon-based powder Substances 0.000 description 1
- 239000002436 steel type Substances 0.000 description 1
- 238000009628 steelmaking Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 235000019587 texture Nutrition 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
- 229910052726 zirconium Inorganic materials 0.000 description 1
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- C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/01—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics
- C04B35/03—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics based on magnesium oxide, calcium oxide or oxide mixtures derived from dolomite
- C04B35/04—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics based on magnesium oxide, calcium oxide or oxide mixtures derived from dolomite based on magnesium oxide
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- Compositions Of Oxide Ceramics (AREA)
Abstract
The invention relates to a high-temperature sintered magnesia-zirconia sliding brick added with titanium reinforced corundum and a production method thereof, and the raw materials are as follows: 58-69.5% of sintered magnesia, 10-15% of large-crystal fused magnesia, 5-15% of titanium reinforced corundum, 5-10% of zirconia corundum, 0.5-1% of silica fume, 2-3% of metallic silicon, 1-2% of metallic silicon micro powder and 1-2% of magnesium aluminum alloy, and 3-5% of thermosetting phenolic resin binder by total weight of the raw materials is added. The product of the invention has 5-8% of apparent porosity, 3.00-3.10g/cm 3 of volume density, 120-180MPa of normal temperature compressive strength, 15-35MPa of normal temperature flexural strength, 15-18MPa of high temperature flexural strength and 62-73% of residual flexural strength retention rate (water cooling at 1100 ℃ for 3 times). The sliding plate brick of the invention only contains a small amount of resin and asphalt cracking carbon, has strong oxidation resistance and excellent thermal shock stability and erosion resistance, and is suitable for smelting low-carbon steel, high-calcium steel, clean steel and other steel varieties.
Description
Technical Field
The invention relates to a high-temperature sintered magnesia-zirconia sliding brick added with titanium reinforced corundum and a production method thereof, belonging to the technical field of functional refractory materials.
Background
The sliding plate brick is used as a key component of a sliding gate refractory of a steel flow control system, the performance and the service life of the sliding plate brick directly determine the advantages and disadvantages of the sliding gate system, the sliding gate refractory has obvious influence on steelmaking continuous casting efficiency, and meanwhile, the sliding plate brick is subjected to scouring of high-temperature molten steel and erosion of molten steel in the casting process in the service process, particularly the erosion of sliding plates when calcium-treated steel, high-manganese steel, high-oxygen steel and other varieties of steel are smelted is more serious, and higher requirements are put on the erosion resistance and oxidation resistance of the sliding plate brick.
The traditional sliding plate brick is usually made of carbon-containing refractory materials, aluminum carbon and aluminum zirconium carbon are commonly used, the carbon content is about 5-10%, the traditional sliding plate brick has higher carbon content in the production and use processes, the refractory materials are worn during high-temperature service, carbon is dissolved in molten steel, carburetion pollution is caused, the problem of influencing the quality of steel is difficult to meet the production requirement of high-quality steel such as clean steel/ultra-clean steel, meanwhile, the high-temperature mechanical property of the material is lower, the erosion resistance of the carbon anti-melting steel is poor and is easy to oxidize, the service life of the sliding plate is influenced, the continuous casting efficiency is directly influenced, and in addition, the carbon composite material is easy to oxidize during high-temperature use, the material structure is damaged, and the service life is influenced.
On the other hand, when the traditional aluminum carbon and aluminum zirconium carbon sliding plate brick is used for smelting high-calcium steel and high-manganese steel, the sliding plate material easily forms low-melting matters with Ca and Mn in molten steel, so that the sliding plate brick is abnormally corroded, the safety coefficient and the service life of the sliding plate brick are influenced, and the magnesium carbon sliding plate has superior erosion resistance, but because of the large thermal expansion coefficient of periclase, the thermal shock stability of the magnesium carbon sliding plate is poor, and the service life of the magnesium carbon sliding plate is relatively low.
Disclosure of Invention
Aiming at the defects of the prior art, the invention aims to provide a high-temperature sintered magnesia-zirconia sliding brick added with titanium reinforced corundum and a production method thereof.
In order to achieve the above purpose, the technical scheme adopted by the invention is as follows:
The high-temperature sintered magnesia-zirconia sliding brick added with the titanium reinforced corundum comprises the following raw materials in percentage by weight: 58-69.5% of sintered magnesia, 10-15% of large-crystal fused magnesia, 5-15% of titanium reinforced corundum, 5-10% of zirconia corundum, 0.5-1% of silica fume, 2-3% of metallic silicon, 1-2% of metallic silicon micro powder and 1-2% of magnesium aluminum alloy, and 3-5% of thermosetting phenolic resin binder by total weight of the raw materials is added.
The high-temperature sintered magnesia-zirconia sliding brick added with the titanium reinforced corundum has MgO content of more than or equal to 98.5 percent, and comprises two granular materials of 1mm < 1-3 mm and 0.5mm < 2-1 mm, wherein the weight ratio of different granularities is granularity 1: particle size 2=35:23-34.5.
The high-temperature sintered magnesia-zirconia sliding brick added with the titanium reinforced corundum has MgO content of more than or equal to 98 percent and CaO/SiO 2 content ratio of more than 1.5 and has granularity of: 0.044mm < granularity 3 is less than or equal to 0.5mm, granularity 4 is less than or equal to 0.044mm, and the weight ratio of different granularities is granularity 3: particle size 4=0-8:2-15.
The main component of the titanium reinforced corundum is ：TiO2：15-18％、Al2O3：70-75％、MgO≤5％、CaO≤1％、Fe2O3+SiO2≤2％, granularity less than or equal to 0.074mm.
The high-temperature sintered magnesia-zirconia sliding brick added with the titanium reinforced corundum has the main components of zirconia corundum, which is fine powder with granularity less than or equal to 0.044mm ：ZrO2：23-27％,Al2O3：71-75％,SiO2≤0.5％,Fe2O3≤0.5％,Na2O≤0.3％.
The high-temperature sintered magnesia-zirconia sliding brick added with the titanium reinforced corundum is obtained by collecting and treating smoke dust escaping with waste gas in the process of smelting industrial silicon and ferrosilicon at high temperature by an industrial electric furnace through a collecting device, wherein the content of SiO 2 is more than or equal to 93 percent, and the average grain diameter is less than or equal to 0.15 mu m.
The Si content in the metal silicon of the high-temperature sintered magnesia-zirconia sliding brick added with the titanium reinforced corundum is more than or equal to 98 percent, and the granularity is less than or equal to 0.044mm.
The Si content in the metal silicon micropowder is more than or equal to 98 percent, and D50=1μm; the granularity of the magnesium-aluminum alloy is less than or equal to 0.074mm, and the content ratio of the magnesium to the aluminum is as follows: al, mg=1:1.
The model of the phenolic resin of the high-temperature sintered magnesia-zirconia sliding brick added with the titanium reinforced corundum is PF5323.
The preparation method of the high-temperature sintered magnesia-zirconia sliding brick added with the titanium reinforced corundum comprises the following specific steps:
(1) Weighing the raw materials according to a proportion for standby;
(2) Adding the raw materials with the granularity less than or equal to 0.5mm into a conical mixer according to the sequence of light weight and heavy weight, and mixing for 20-30min to obtain premixed powder;
(3) Adding particles with the size larger than 0.5mm in the raw materials into an edge runner mill, stirring for 3-5min, adding thermosetting phenolic resin, stirring for 5-8min, adding premixed powder after the particles are completely wetted, and continuously mixing for 20-30min to obtain pug;
(4) The temperature of the pug is reduced to below 30 ℃ and then the pug is pressed and molded to obtain a slide plate brick blank;
(5) Naturally drying the blank for 24 hours, then drying the blank in a dryer at a heating rate of 10-15 ℃/h and a drying temperature of 160-180 ℃, and preserving heat for 8-10 hours after the temperature reaches the drying temperature;
(6) Firing the dried green body in nitrogen atmosphere at 1100-1300 ℃ for 6-10h;
(7) Carrying out asphalt dipping treatment on the fired product, and carrying out annealing treatment at 500-800 ℃; after oil immersion, the target product is prepared through the procedures of hooping, grinding and coating.
The invention has the beneficial effects that:
According to the invention, the magnesia carbon sliding plate is modified, and the thermal shock stability of the sliding plate brick is improved through non-oxide reinforcement and phase-change micro-crack toughening technology, meanwhile, the introduction of a direct carbon source is eliminated, the carbon content of the sliding plate brick is reduced, and the magnesia zirconium sliding plate brick with excellent performance is developed.
(1) The high-temperature sintered magnesia-zirconia low-carbon sliding plate brick only contains a small amount of resin and asphalt cracking carbon, has strong oxidation resistance and excellent thermal shock stability and erosion resistance, and is suitable for smelting low-carbon steel, high-calcium steel, clean steel and other steel varieties.
(2) The granular aggregate in the invention adopts the sintered magnesia, can improve the thermal shock stability and erosion resistance of the sliding plate brick, has relatively small grain size, generally 30-50 mu m, uniform crystal size, pure texture, multiple grain boundaries and micropore structures of materials, fewer inter-crystal silicate phases, multiple direct bonding among crystals, multiple closed pores in and among crystals, uniform pore size, more pore diameters below 5 mu m and good thermal shock resistance and slag erosion resistance.
(3) The large-crystal fused magnesia is introduced in the form of particles and fine powder smaller than 0.5mm, so that the erosion resistance of the sliding brick can be obviously improved. The large crystal fused magnesia fine powder is matched with high-purity brine magnesia aggregate for use, so that the thermal shock stability of the sliding brick is improved, and the erosion resistance of the sliding brick is improved.
(4) According to the invention, a titanium reinforced corundum raw material is introduced, a high-temperature sintering heat treatment process is adopted, and in the high-temperature heat treatment process of the product, ti 2O3 in the titanium reinforced corundum, mgO in magnesia and ZrO 2 in zirconia corundum react to generate a non-oxide solid solution reinforced phase Mg 0.25Zr0.38Ti0.38O1.75, so that the thermal shock stability of the sliding plate brick can be improved (see figure 1);
(5) According to the invention, the amorphous SiO 2, the aluminum magnesium alloy and the Al 2O3 in the titanium reinforced corundum and the MgO in the magnesia are introduced into the silica fume to generate a non-oxide reinforced phase of a MgO-Al 2O3-SiO2 system, such as MgAl 2O4、Mg2SiO4 and the like, so that the performance of the sliding plate brick is improved;
(6) According to the invention, magnesium-aluminum alloy, metal silicon with different granularity and metal silicon micropowder are used as metal raw materials, and the reactivity and melting point difference of the magnesium-aluminum alloy and the metal silicon are utilized, so that the magnesium-aluminum alloy and the metal silicon react in a gradient manner based on temperature in the high-temperature sintering and using processes of the product, and non-oxide reinforcing phases such as SiC, mgAl 2O4 and the like are generated, so that the using performance of the sliding plate brick is continuously improved;
(7) Zirconia corundum raw material is introduced into the magnesia system, the thermal shock stability of the sliding brick is improved by utilizing the characteristic of micro-crack toughening generated by zirconia phase transition, and the erosion resistance of the sliding brick is improved by utilizing the excellent chemical stability of zirconia.
(8) The sliding plate brick disclosed by the invention adopts reasonable raw material proportion and an optimized heat treatment process, and has the advantages of high strength, good thermal shock stability, strong adaptability to steel types, long service life and the like.
The performance index of the product is measured by the test: the apparent porosity is 5-8%, the volume density is 3.00-3.10g/cm 3, the normal temperature compressive strength is 120-180MPa, the normal temperature flexural strength is 15-35MPa, the high temperature flexural strength is 15-18MPa, and the residual flexural strength retention rate (water cooling at 1100 ℃ for 3 times) is 62-73%.
The performance of the product meets the performance index requirements of HBMLT-80 marks (dipping) in YB/T5049-2019 'sliding plate brick' industry standard: the apparent porosity is less than or equal to 10%, the volume density is more than or equal to 2.80g/cm 3, the normal-temperature compressive strength is more than or equal to 90MPa, and the method has obvious advantages.
Drawings
Figure 1 XRD diffractogram of the product of the invention.
Detailed Description
The following describes the embodiments of the present invention in further detail with reference to examples.
Example 1
The high-temperature sintered magnesia-zirconia sliding brick added with the titanium reinforced corundum comprises the following raw materials in percentage by weight: 69.5% of sintered magnesia, 15% of large-crystal fused magnesia, 5% of titanium reinforced corundum, 5% of zirconia corundum, 0.5% of silica fume, 3% of metallic silicon, 1% of metallic silicon micropowder and 1% of magnesium aluminum alloy, and 3% of thermosetting phenolic resin binder based on the total weight of the raw materials.
Sintering magnesite: the magnesium hydroxide is prepared by calcining high-purity magnesium hydroxide extracted from brine, wherein the MgO content is more than or equal to 98.5 percent, and the magnesium hydroxide comprises two types of granularity of 1mm < 1-3 mm, granularity of 0.5mm < 2-1 mm and different granularity weight ratios: particle size 1: particle size 2=35:34.5.
Large crystal fused magnesia: mgO content is more than or equal to 98%, caO/SiO 2 content ratio is more than 1.5, granularity is less than or equal to 0.044mm.
Titanium reinforced corundum: is prepared from slag waste generated in ferrotitanium metallurgy smelting through electric smelting at 2000-2300 ℃ and impurity removal, and has the granularity less than or equal to 0.074mm, and the main components thereof ：TiO2：15-18％,Al2O3：70-75％,MgO≤5％,CaO％≤1％,Fe2O3+SiO2≤2％.
Zirconia corundum: fine powder with granularity less than or equal to 0.044mm and main composition ：ZrO2：23-27％,Al2O3：71-75％,SiO2≤0.5％,Fe2O3≤0.5％,Na2O≤0.3％.
Silica fume: the method is characterized in that in the process of smelting industrial silicon and ferrosilicon at high temperature by an industrial electric furnace, smoke escaping along with waste gas is collected and treated by a collecting device, the content of SiO 2 in the silicon ash is more than or equal to 93%, and the average grain diameter is more than or equal to 0.1 mu m and less than or equal to 0.15 mu m.
Metal silicon powder: si content is not less than 98%, and granularity is not more than 0.044mm.
Metal silicon micropowder: si content is not less than 98%, D50=1μm.
Magnesium aluminum alloy: particle size less than or equal to 0.074mm, and magnesium-aluminum content ratio: al, mg=1:1.
Phenolic resin: model PF5323.
The production method of the magnesium zirconium sliding plate brick comprises the following steps:
(1) Weighing the raw materials according to a proportion for standby;
(2) Firstly, adding materials with the diameters less than or equal to 0.5mm in the raw materials into a conical mixer in the order of light materials and heavy materials, and mixing for 20-30min to obtain premixed powder;
(3) Adding particles with the size larger than 0.5mm in the raw materials into a wet mill, stirring for 3-5min, adding a proper amount of thermosetting phenolic resin, stirring for 5-8min, adding premixed powder after the particles are completely wetted, and continuously mixing for 20-30min to obtain pug;
(4) After the temperature of the pug is reduced to below 30 ℃, carrying out compression molding to obtain a slide plate brick blank;
(5) Naturally drying the blank for 24 hours, then drying the blank in a dryer at a heating rate of 10-15 ℃/h and a drying temperature of 160-180 ℃, and preserving heat for 8-10 hours after the drying temperature reaches a target temperature;
(6) Firing the dried product in nitrogen atmosphere in a nitriding furnace, wherein the firing temperature is 1300 ℃, and the heat preservation time is 6 hours;
(7) Carrying out asphalt dipping treatment on the burnt product, and carrying out annealing treatment at 800 ℃; the product after oil immersion is subjected to the procedures of hooping, grinding, coating and the like, and the target product is prepared.
The product of this example was subjected to XRD diffractometry to analyze the phase composition of the product as shown in fig. 1.
As can be seen from fig. 1: (1) The aluminum-magnesium alloy phase is not detected in the burnt product, the reaction temperature of the magnesium-aluminum alloy is lower in the burning process, the reaction is completed, a small amount of residual metal Si is detected, the metal Si with different granularity is partially reacted, the residual metal Si can continuously react in the using process of the product, and the using performance of the product is improved; (2) The product of the invention generates new non-oxide reinforcing phases such as MgAl 2O4、Mg2SiO4, siC and Mg 0.25Zr0.38Ti0.38O1.75 solid solution after high-temperature sintering, and can obviously improve the performance of the product.
Performance index of the product: the apparent porosity is 5%, the volume density is 3.10g/cm 3, the normal temperature compressive strength is 120MPa, the normal temperature flexural strength is 15MPa, the high temperature flexural strength is 15MPa, and the residual flexural strength retention rate (water cooling at 1100 ℃ for 3 times) is 62%.
Example 2
The high-temperature sintered magnesia-zirconia sliding brick added with the titanium reinforced corundum comprises the following raw materials in percentage by weight: 64% of sintered magnesia, 12% of large-crystal fused magnesia, 10% of titanium reinforced corundum, 8% of zirconia corundum, 0.5% of silica fume, 2.5% of metallic silicon, 1.5% of metallic silicon micro powder and 1.5% of magnesium aluminum alloy, and a thermosetting phenolic resin binder accounting for 4% of the total weight of the raw materials is added.
Sintering magnesite: mgO content is more than or equal to 98.5%, and the MgO content comprises two types of granularity of 1mm < 3mm less than or equal to 1mm, granularity of 0.5mm < 2mm less than or equal to 1mm, and weight ratio of different granularities: particle size 1: particle size 2=35:29.
Large crystal fused magnesia: mgO content is more than or equal to 98%, caO/SiO 2 content ratio is more than 1.5, the grain size is less than or equal to 0.044mm and less than or equal to 0.5mm, the grain size is less than or equal to 4mm, and weight ratio of different grain sizes is: particle size 3: particle size 4=5:7.
The performance requirements of the other raw materials are the same as in example 1.
The production method of the magnesium zirconium sliding plate brick is basically the same as that of the embodiment 1, and the difference is that:
Firing the dried product in a nitrogen atmosphere in a nitriding furnace, wherein the firing temperature is 1200 ℃, and the heat preservation time is 8 hours;
carrying out asphalt dipping treatment on the burned product in the step (7), and annealing at 600 ℃; the product after oil immersion is subjected to the procedures of hooping, grinding, coating and the like, and the target product is prepared.
The performance index of the obtained product is as follows: the apparent porosity is 6%, the volume density is 3.06g/cm 3, the normal temperature compressive strength is 145MPa, the normal temperature flexural strength is 26MPa, the high temperature flexural strength is 16.5MPa, and the residual flexural strength retention rate (water cooling at 1100 ℃ for 3 times) is 67%.
Example 3
The high-temperature sintered magnesia-zirconia sliding brick added with the titanium reinforced corundum comprises the following raw materials in percentage by weight: 58% of sintered magnesia, 10% of large-crystal fused magnesia, 15% of titanium reinforced corundum, 10% of zirconia corundum, 1% of silica fume, 2% of metallic silicon micropowder and 2% of magnesium aluminum alloy, and a thermosetting phenolic resin binder accounting for 5% of the total weight of the raw materials is added.
Sintering magnesite: mgO content is more than or equal to 98.5%, and the MgO content comprises two types of granularity of 1mm < granularity of 1-3 mm, granularity of 0.5mm < granularity of 2-1 mm, and different granularity weight ratios: particle size 1: particle size 2=35:23.
Large crystal fused magnesia: mgO content is more than or equal to 98%, caO/SiO 2 is more than 1.5, the granularity is less than or equal to 0.044mm and less than or equal to 0.5mm, the granularity is less than or equal to 4mm, and the weight ratio of different granularities is different: particle size 3: particle size 4=8:2.
The performance requirements of the other raw materials are the same as in example 1.
The production method of the magnesium zirconium sliding plate brick is basically the same as that of the embodiment 1, and the difference is that:
(6) Firing the dried product in nitrogen atmosphere in a nitriding furnace, wherein the firing temperature is 1100 ℃, and the heat preservation time is 10 hours;
(7) Carrying out asphalt dipping treatment on the burned product, and carrying out annealing treatment at 500 ℃; the product after oil immersion is subjected to the procedures of hooping, grinding, coating and the like, and the target product is prepared.
The performance index of the obtained product is as follows: the apparent porosity is 8%, the volume density is 3.00g/cm 3, the normal-temperature compressive strength is 180MPa, the normal-temperature flexural strength is 35MPa, the high-temperature flexural strength is 18MPa, and the residual flexural strength retention rate (3 times of water cooling at 1100 ℃) is 73%.
The XRD diffractograms of the other example products were similar to example 1.
Claims (10)
1. The high-temperature sintered magnesia-zirconia sliding brick added with the titanium reinforced corundum is characterized by comprising the following raw materials in percentage by weight: 58-69.5% of sintered magnesia, 10-15% of large-crystal fused magnesia, 5-15% of titanium reinforced corundum, 5-10% of zirconia corundum, 0.5-1% of silica fume, 2-3% of metallic silicon, 1-2% of metallic silicon micro powder and 1-2% of magnesium aluminum alloy, and 3-5% of thermosetting phenolic resin binder by total weight of the raw materials is added.
2. The high-temperature sintered magnesia-zirconia sliding brick added with the titanium reinforced corundum according to claim 1, wherein the MgO content in the sintered magnesia is more than or equal to 98.5 percent, and the high-temperature sintered magnesia-zirconia sliding brick comprises two granules with the granularity of 1mm being less than or equal to 3mm and the granularity of 0.5mm being less than or equal to 2 mm, wherein the weight ratio of different granularities is granularity 1: particle size 2=35:23-34.5.
3. The high-temperature sintered magnesia-zirconia sliding brick added with the titanium reinforced corundum according to claim 1, wherein the MgO content in the large-crystal fused magnesia is more than or equal to 98%, the CaO/SiO 2 content ratio is more than 1.5, and the granularity is: 0.044mm < granularity 3 is less than or equal to 0.5mm, granularity 4 is less than or equal to 0.044mm, and the weight ratio of different granularities is granularity 3: particle size 4=0-8:2-15.
4. The high-temperature sintered magnesia-zirconia sliding brick added with the titanium reinforced corundum as claimed in claim 1, wherein the main component of the titanium reinforced corundum is ：TiO2：15-18％、Al2O3：70-75％、MgO≤5％、CaO≤1％、Fe2O3+SiO2≤2％, granularity less than or equal to 0.074mm.
5. The high-temperature sintered magnesia-zirconia sliding brick added with the titanium reinforced corundum as claimed in claim 1, wherein the zirconia corundum is fine powder with granularity less than or equal to 0.044mm, and the main component is ：ZrO2：23-27％,Al2O3：71-75％,SiO2≤0.5％,Fe2O3≤0.5％,Na2O≤0.3％.
6. The high-temperature sintered magnesia-zirconia sliding brick added with the titanium reinforced corundum as set forth in claim 1, wherein the silica fume is obtained by collecting and treating the fume escaping with the waste gas in the process of smelting industrial silicon and ferrosilicon at high temperature by an industrial electric furnace through a collecting device, wherein the content of SiO 2 is more than or equal to 93 percent, and the average grain diameter is less than or equal to 0.1 μm.
7. The high-temperature sintered magnesia-zirconia sliding brick added with the titanium reinforced corundum as claimed in claim 1, wherein the Si content in the metallic silicon is more than or equal to 98 percent and the granularity is less than or equal to 0.044mm.
8. The high-temperature sintered magnesia-zirconia sliding brick added with the titanium reinforced corundum according to claim 1, which is characterized in that the Si content in the metal silicon micropowder is more than or equal to 98 percent and D50=1μm; the granularity of the magnesium-aluminum alloy is less than or equal to 0.074mm, and the content ratio of magnesium to aluminum is as follows: al, mg=1:1.
9. The titanium reinforced corundum added high temperature sintered magnesia zirconia sliding brick as in claim 1 wherein the phenolic resin model is PF5323.
10. A method for preparing the high-temperature sintered magnesia-zirconia sliding brick added with the titanium reinforced corundum as claimed in any one of claims 1 to 9, which is characterized by comprising the following specific steps:
(1) Weighing the raw materials according to a proportion for standby;
(2) Adding the raw materials with the granularity less than or equal to 0.5mm into a conical mixer according to the sequence of light weight and heavy weight, and mixing for 20-30min to obtain premixed powder;
(3) Adding particles with the size larger than 0.5mm in the raw materials into an edge runner mill, stirring for 3-5min, adding thermosetting phenolic resin, stirring for 5-8min, adding premixed powder after the particles are completely wetted, and continuously mixing for 20-30min to obtain pug;
(4) The temperature of the pug is reduced to below 30 ℃ and then the pug is pressed and molded to obtain a slide plate brick blank;
(5) Naturally drying the blank for 24 hours, then drying the blank in a dryer at a heating rate of 10-15 ℃/h and a drying temperature of 160-180 ℃, and preserving heat for 8-10 hours after the temperature reaches the drying temperature;
(6) Firing the dried green body in nitrogen atmosphere at 1100-1300 ℃ for 6-10h;
(7) Carrying out asphalt dipping treatment on the fired product, and carrying out annealing treatment at 500-800 ℃; after oil immersion, the target product is prepared through the procedures of hooping, grinding and coating.
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