CN110615670A - High-performance magnesium sliding brick and preparation method thereof - Google Patents
High-performance magnesium sliding brick and preparation method thereof Download PDFInfo
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Abstract
The invention discloses a high-performance magnesium sliding brick, which comprises the following components in percentage by weight: 97 percent to 54 percent of fused magnesia, 7 percent to 9 percent of forsterite, 12 percent to 18 percent of fused spinel, 4 percent to 6 percent of high-temperature sintering promoting powder, 5 percent to 8 percent of ceramic plastic adhesive, 1 percent to 3 percent of carbon-containing powder, 1 percent to 3 percent of graphite, 1 percent to 3 percent of boron carbide, 4 percent to 6 percent of aluminum-magnesium alloy powder, 2 percent to 4 percent of silicon powder, 100 percent of the total weight of all the components in the formula, 4 percent to 5 percent of additional resin and 0.4 percent to 0.5 percent of resin reinforcing agent. The invention aims to provide a high-performance magnesium sliding plate brick which is cast with calcium-treated steel, high-oxygen steel and low-carbon high-quality steel, opens up a new industrial field, solves the problems of short service life of sliding plates and high consumption of refractory steel per ton in a plurality of steel mills, saves cost for the steel mills, reduces resource waste, and has obvious cost reduction and efficiency improvement, and a preparation method thereof.
Description
Technical Field
The invention relates to the field of inorganic non-metallic refractory materials using aluminum oxide, magnesium oxide and carbon as base materials, in particular to a high-performance magnesium sliding plate brick and a preparation method thereof.
Background
At present, the domestic sliding plates mainly comprise aluminum-zirconium-carbon sliding plates, aluminum-carbon sliding plates and sliding plates embedded with zirconium rings. The aluminum-zirconium-carbon sliding plate has good thermal shock resistance, erosion resistance and wear resistance when the plain steel is poured, has good comprehensive performance, and is a mature product. But when casting steel with calcium, because of Al in the slide2O3The SiO2 and CaO in molten steel can react at a lower temperature to generate low-melting matters, and the surface of the sliding plate is easy to be roughened and clamped in the process of scouring and controlling the flow of the molten steel. Although the zirconia slide plate has good thermal shock resistance, erosion resistance, oxidation resistance and other performances when pouring calcium treated steel, the zirconia slide plate also has melting property when pouring aluminum killed steelIn the case of damage to the material,
and zirconia is relatively expensive, in which case we have developed high performance magnesium skateboards.
Because magnesia has better molten steel erosion resistance and slag erosion resistance, the magnesia mainly comprises periclase and periclase-spinel which are developed by using high-purity magnesia, and the thermal shock resistance of the periclase sliding nozzle is poorer because the thermal expansion coefficient of the periclase is larger. In order to improve the thermal shock resistance, sintered magnesia and seawater magnesia are generally used as particles, and fused magnesia is used as fine powder. Because of the low coefficient of thermal expansion of magnesia alumina spinel compared to steatite, particulate forms of synthetic spinel have been added to the periclase quality of the sliding gate valve and we have developed a periclase-spinel sliding gate valve that has relatively good thermal shock resistance. The chemical composition of the spinel added is preferably close to the theoretical composition. The high-temperature strength of the magnesium sliding gate is not high due to the fact that the periclase is high in melting point and difficult to sinter. In order to promote the sintering, the in-situ spinel combines periclase crystals, so that the high-temperature strength of the material can be improved. Some magnesium sliding water gaps are also dipped with asphalt to further improve the thermal shock resistance and the erosion resistance, reduce the diameter of the gas hole and the size of the defect on the surface of the sliding plate and prolong the service life.
The price of the magnesium raw material is lower than that of the zirconia alumina, so the magnesium sliding gate has cost advantage. However, the service life of the magnesium sliding gate is limited due to poor thermal shock resistance and low high-temperature strength, so that the magnesium sliding gate is rarely used at home at present and has a certain market in Europe.
Disclosure of Invention
In order to solve the problems, the invention aims to provide a high-performance magnesium sliding brick with cast calcium-treated steel, high-oxygen steel and low-carbon high-quality steel, which opens up a new field of industry, solves the problems of low service life of sliding plates and high consumption of refractory steel per ton in a plurality of steel mills, saves cost for the steel mills, reduces resource waste, lowers cost and increases efficiency, and a preparation method thereof.
The purpose of the invention can be realized by the following technical scheme:
the high-performance magnesium sliding brick comprises the following components in percentage by weight: comprises the following components: 97 percent to 54 percent of fused magnesia, 7 percent to 9 percent of forsterite, 12 percent to 18 percent of fused spinel, 4 percent to 6 percent of high-temperature sintering promoting powder, 5 percent to 8 percent of ceramic plastic adhesive, 1 percent to 3 percent of carbon-containing powder, 1 percent to 3 percent of graphite, 1 percent to 3 percent of boron carbide, 4 percent to 6 percent of aluminum-magnesium alloy powder, 2 percent to 4 percent of silicon powder, 100 percent of the total weight of all the components in the formula, 4 percent to 5 percent of additional resin and 0.4 percent to 0.5 percent of resin reinforcing agent.
The grain composition of each component is as follows: 97 (3-1, 2-1, 1-0.5 mm) fused magnesite grain diameter and more than or equal to 200 meshes, 1-0 mm of forsterite grain diameter, 0.5-0 mm of fused spinel grain diameter, more than or equal to 200 meshes of high-temperature burning promoting powder, more than or equal to 180 meshes of ceramic plastic binder, 325 meshes of carbon-containing powder, 325 meshes of graphite, more than or equal to 180 meshes of boron carbide, more than or equal to 180 meshes of aluminum-magnesium alloy powder and more than or equal to 180 meshes of silicon powder, and the resin reinforcing agent are liquid.
The 97 electric melting magnesia has the grain composition according to the weight percentage:
according to the weight percentage, the sum of the particle composition weight percentage of 97 electric smelting magnesite is 35 to 38 percent.
97 electric smelting magnesite: the MgO content is more than or equal to 97 percent, and the content of the forsterite is as follows: the content of SiO2 is less than or equal to 40 percent, the content of MgO is more than or equal to 45 percent, the content of the electric melting spinel is as follows: al (Al)2O3The content is more than or equal to 72 percent, the MgO content is more than or equal to 21 percent, and the high-temperature sintering promoting powder comprises the following components in percentage by weight: SiO2 content is less than or equal to 30 percent, Al2O3The content is more than or equal to 72 percent, and the ceramic plastic adhesive comprises the following components in percentage by weight: bulk density of about 450g/L, carbon-containing powder: the content of residual carbon is 85%, and the ratio of graphite: the content of C is more than or equal to 97 percent, and the content of boron carbide is as follows: the content of B4C is more than or equal to 90 percent, the aluminum magnesium alloy powder: the Al content is 50 +/-3%, the active metal (Al + Mg) is not less than 97.0%, and the silicon powder: the content of Si is more than or equal to 97 percent, and the weight percentage of the resin is as follows: the residual carbon content is 45 +/-4%, the solid content is 75-80%, and the viscosity is 15000-18000 mpa.
The preparation method of the high-performance magnesium sliding brick comprises the steps of stirring and mixing 97 electric melting magnesite, forsterite, electric melting spinel, high-temperature burning promoting powder, ceramic plastic adhesive, carbon-containing powder, graphite, boron carbide, aluminum-magnesium alloy powder, silicon powder, resin and resin reinforcing agent in proportion, then forming and naturally drying, then placing the mixture into a drying kiln, slowly heating and drying for 40-60 hours, preferably when the temperature of the drying kiln does not exceed 180-190 ℃, then pushing the mixture into a medium-high temperature tunnel kiln, uniformly heating to 580 +/-20 ℃, preserving heat for 15-20 hours, and finally uniformly cooling for 16-25 hours.
The high-performance magnesium sliding brick is produced by heating the drying kiln to 80 deg.c in 1 hr, maintaining at 80 deg.c for 12 hr, heating from 80 deg.c to 190 deg.c in 24 hr, and maintaining at 190 deg.c for 20 hr.
The high-performance magnesium sliding brick is prepared by uniformly heating to 580 +/-20 ℃ within 15-20 hours and finally uniformly cooling for 20 hours.
The magnesium-rich alkaline sliding plate is a compound which is very stable at high temperature and has a higher melting point, the thermal expansion coefficient of the magnesium-rich alkaline sliding plate is smaller than that of a corundum material, and the elastic modulus of the magnesium-rich alkaline sliding plate is between that of a zirconium plate and that of corundum, so that the magnesium-rich alkaline sliding plate has better chemical erosion resistance and thermal shock resistance.
1, the high-performance magnesium material is used as an alkaline resistant material, has a slow reaction speed with CaO when casting calcium-treated steel, and has excellent erosion resistance compared with aluminum-carbon and aluminum-zirconium-carbon sliding plates. And secondly, the magnesium-rich spinel has higher wear resistance, and can well improve the problem of galling of the sliding plate in the use process.
2, the high-property energy magnesium material also has a phase change process similar to that of a zirconium plate in the temperature rising and falling process, and microcracks are generated to achieve the effect of improving thermal shock resistance.
Compared with corundum and zirconium materials, the magnesium-rich spinel material has smaller density and larger porosity, so that the magnesium-rich spinel material has excellent thermal shock resistance.
The addition of carbon black with very low reactivity at high temperature is increased. The particle size distribution of the pug and the firing temperature of the product are improved and controlled, and the compactness of the material is improved. Meanwhile, the aluminum-magnesium alloy powder is added into the matrix, so that an inert compound can be produced in situ on the surface of the material in the heat treatment process of the material, and the penetration and oxidation of molten steel to the sliding plate are slowed down, so that the use is improved.
The product is mainly applied to a shaped refractory material matrix, the refractoriness of the product is more than 1800 ℃, the internal structure of the product is easily promoted to form carbon bonding after the green brick is dried at 180-250 ℃, and the product is prepared by the following steps under the conditions of keeping the original normal-temperature compressive strength, body density and air holes of the product: the green brick has excellent thermal shock resistance, stripping resistance and oxidation resistance, the product toughness is enhanced, and the influence of extreme cold and extreme heat on the green brick in the using process can be effectively improved, so that the green brick is cracked and stripped to influence the use, and the purpose of prolonging the service life is achieved.
The ceramic plastic agent is an inorganic additive, is used for compression molding, ramming materials and extrusion molding of green bodies, has the plasticizing effect even if the addition amount is small, has enhanced toughness, and can generate swelling under the action of mixed water, thereby generating the plasticizing effect and increasing the mechanical strength of the green bodies.
Detailed Description
The high-performance magnesium sliding brick comprises the following components in percentage by weight: comprises the following components: 97 percent to 54 percent of fused magnesia, 7 percent to 9 percent of forsterite, 12 percent to 18 percent of fused spinel, 4 percent to 6 percent of high-temperature sintering promoting powder, 5 percent to 8 percent of ceramic plastic adhesive, 1 percent to 3 percent of carbon-containing powder, 1 percent to 3 percent of graphite, 1 percent to 3 percent of boron carbide, 4 percent to 6 percent of aluminum-magnesium alloy powder, 2 percent to 4 percent of silicon powder, 100 percent of the total weight of all the components in the formula, 4 percent to 5 percent of additional resin and 0.4 percent to 0.5 percent of resin reinforcing agent.
The grain composition of each component is as follows: 97 (3-1, 2-1, 1-0.5 mm) fused magnesite grain diameter and more than or equal to 200 meshes, 1-0 mm of forsterite grain diameter, 0.5-0 mm of fused spinel grain diameter, more than or equal to 200 meshes of high-temperature burning promoting powder, more than or equal to 180 meshes of ceramic plastic binder, 325 meshes of carbon-containing powder, 325 meshes of graphite, more than or equal to 180 meshes of boron carbide, more than or equal to 180 meshes of aluminum-magnesium alloy powder and more than or equal to 180 meshes of silicon powder, and the resin reinforcing agent are liquid.
The 97 electric melting magnesia has the grain composition according to the weight percentage:
according to the weight percentage, the sum of the particle composition weight percentage of 97 electric smelting magnesite is 35 to 38 percent.
97 electric smelting magnesite: the MgO content is more than or equal to 97 percent, and the content of the forsterite is as follows: the content of SiO2 is less than or equal to 40 percent, the content of MgO is more than or equal to 45 percent, the content of the electric melting spinel is as follows: al (Al)2O3The content is more than or equal to 72 percent, the MgO content is more than or equal to 21 percent, and the high-temperature sintering promoting powder comprises the following components in percentage by weight: SiO2 content is less than or equal to 30 percent, Al2O3The content is more than or equal to 72 percent, and the ceramic plastic adhesive comprises the following components in percentage by weight: bulk density of about 450g/L, carbon-containing powder: the content of residual carbon is 85%, and the ratio of graphite: the content of C is more than or equal to 97 percent, and the content of boron carbide is as follows: the content of B4C is more than or equal to 90 percent, the aluminum magnesium alloy powder: the Al content is 50 +/-3%, the active metal (Al + Mg) is not less than 97.0%, and the silicon powder: the content of Si is more than or equal to 97 percent, and the weight percentage of the resin is as follows: the residual carbon content is 45 +/-4%, the solid content is 75-80%, and the viscosity is 15000-18000 mpa. The preparation method of the high-performance magnesium sliding plate brick comprises the steps of stirring and mixing 97 electric smelting magnesite, forsterite, electric smelting spinel, high-temperature burning promoting powder, a ceramic plastic adhesive, carbon-containing powder, graphite, boron carbide, aluminum-magnesium alloy powder, silicon powder, resin and a resin reinforcing agent in proportion, then forming and naturally drying, then placing the mixture into a drying kiln, slowly raising the temperature and drying for 40-60 hours, preferably ensuring that the temperature of the drying kiln does not exceed 180-190 ℃, then pushing the mixture into a medium-high temperature tunnel kiln, uniformly raising the temperature to 580 +/-20 ℃, preserving the heat for 15-20 hours, and finally uniformly lowering the temperature for 16-25 hours.
The high-performance magnesium sliding brick is produced by heating the drying kiln to 80 deg.c in 1 hr, maintaining at 80 deg.c for 12 hr, heating from 80 deg.c to 190 deg.c in 24 hr, and maintaining at 190 deg.c for 20 hr.
The high-performance magnesium sliding brick is prepared by uniformly heating to 580 +/-20 ℃ within 15-20 hours and finally uniformly cooling for 20 hours.
The magnesium-rich alkaline sliding plate is a compound which is very stable at high temperature and has a higher melting point, the thermal expansion coefficient of the magnesium-rich alkaline sliding plate is smaller than that of a corundum material, and the elastic modulus of the magnesium-rich alkaline sliding plate is between that of a zirconium plate and that of corundum, so that the magnesium-rich alkaline sliding plate has better chemical erosion resistance and thermal shock resistance
Example 1
The raw material specification is as follows:
97 electric smelting magnesite: the content of MgO is more than or equal to 97 percent,
forsterite: the content of SiO2 is less than or equal to 40 percent, the content of MgO is more than or equal to 45 percent,
Electrically melting spinel: al (Al)2O3The content is more than or equal to 72 percent, the MgO content is more than or equal to 21 percent,
High-temperature sintering promotion powder: SiO2 content is less than or equal to 30 percent, Al2O3The content is more than or equal to 72 percent,
ceramic plastic adhesive: the bulk density is about 450g/L,
carbon powder content: the content of residual carbon is 85%,
Graphite: the C content is more than or equal to 97 percent,
Boron carbide: the content of B4C is more than or equal to 90 percent,
Aluminum magnesium alloy powder: al content of 50 + -3%, active metal (Al + Mg) not less than 97.0%,
silicon powder: the content of Si is more than or equal to 97 percent,
resin: the residual carbon content is 45 +/-4%, the solid content is 75-80%, and the viscosity is 15000-18000 mpa.
The basic production process of the product of the invention is as follows: according to the formula in the table 1, 97 electric smelting magnesite is crushed and screened, then is mixed according to the formula in the table 1, is added into a wet mill or a high-speed mixing mill to be mixed for 3-6 minutes, is added with a resin binder, and is uniformly mixed with the following fine powder: 97 electrically-fused magnesite, forsterite, electrically-fused spinel, high-temperature sintering promoting powder, ceramic plastic binder, carbon-containing powder, graphite, boron carbide, aluminum-magnesium alloy powder and silicon powder are mixed for 10-30 minutes and then discharged. The forming adopts a spiral brick press of more than 1000 tons, accurately weighs materials according to the shape and size of the brick, adds the weighed materials into a mould, forms the brick to a specified size, measures the external dimension, the flatness and the diagonal dimension of each brick, spot-checks 10% of the unit weight of each shift, detects the porosity and the volume density of each brick, and must scrap and search the reason when finding unqualified phenomena. The formed green bricks can be put into a drying kiln after natural drying, the temperature of the drying kiln is uniformly raised to 80 ℃ within 1 hour in the drying kiln, the green bricks are kept warm for 12 hours at 80 ℃, then the temperature is uniformly raised from 80 ℃ to 190 ℃ within 24 hours, then the green bricks are kept warm for 15-20 hours at 190 ℃, then the green bricks are pushed into a medium-high temperature tunnel kiln to be burned, the temperature is uniformly raised to 580 ℃, the temperature is uniformly raised for 18 hours, then the temperature is kept for 15 hours, and finally the temperature is uniformly lowered for 20 hours. In order to improve the workability of the slider and prevent the occurrence and propagation of cracks, the periphery of the slider is hooped with a steel band. In order to improve the flexibility of the sliding plate in the process of opening and drawing and prevent steel leakage between sliding surfaces, the sliding surface needs to be processed on a grinding machine, and the flatness is required to be less than 0.05 mm. After the grinded sliding plate is qualified through inspection, an asbestos pad and a tinplate or an iron sleeve shell are adhered to the back surface of the grinded sliding plate, and the function of the grinded sliding plate is mainly to reduce the heat transferred to a sliding mechanism through sliding plate bricks and prevent the mechanism from deforming at high temperature to influence the service life.
TABLE 2 comparison table of physicochemical test indexes of products prepared according to 3 formulations in TABLE 1
According to the test results in table 2, it can be seen that: the above 3 formulas can be used normally, and formula 1 has the best effect.
The foregoing is directed to embodiments of the present invention, and it is understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention.
Claims (8)
1. The high-performance magnesium sliding brick is characterized by comprising the following components in percentage by weight: 97 percent to 54 percent of fused magnesia, 7 percent to 9 percent of forsterite, 12 percent to 18 percent of fused spinel, 4 percent to 6 percent of high-temperature sintering promoting powder, 5 percent to 8 percent of ceramic plastic adhesive, 1 percent to 3 percent of carbon-containing powder, 1 percent to 3 percent of graphite, 1 percent to 3 percent of boron carbide, 4 percent to 6 percent of aluminum-magnesium alloy powder, 2 percent to 4 percent of silicon powder, 100 percent of the total weight of all the components in the formula, 4 percent to 5 percent of additional resin and 0.4 percent to 0.5 percent of resin reinforcing agent.
2. The high performance magnesium slide plate brick according to claim 1, wherein the grain composition of each component is: 97 (3-1, 2-1, 1-0.5 mm) fused magnesite grain diameter and more than or equal to 200 meshes, 1-0 mm of forsterite grain diameter, 0.5-0 mm of fused spinel grain diameter, more than or equal to 200 meshes of high-temperature burning promoting powder, more than or equal to 180 meshes of ceramic plastic binder, 325 meshes of carbon-containing powder, 325 meshes of graphite, more than or equal to 180 meshes of boron carbide, more than or equal to 180 meshes of aluminum-magnesium alloy powder and more than or equal to 180 meshes of silicon powder, and the resin reinforcing agent are liquid.
3. The high-performance magnesia slide brick according to claim 2, wherein the 97 fused magnesia has a grain composition in weight percent:
4. the high performance magnesia slide brick of claim 3 wherein the sum of the grain composition weight percentages of 97% fused magnesia by weight is 35-38%.
5. The high performance magnesium slide plate brick according to claim 4 wherein 97 fused magnesite: the MgO content is more than or equal to 97 percent, and the content of the forsterite is as follows: sThe content of iO2 is less than or equal to 40 percent, the content of MgO is more than or equal to 45 percent, the content of the electric melting spinel is as follows: al (Al)2O3The content is more than or equal to 72 percent, the MgO content is more than or equal to 21 percent, and the high-temperature sintering promoting powder comprises the following components in percentage by weight: SiO2 content is less than or equal to 30 percent, Al2O3The content is more than or equal to 72 percent, and the ceramic plastic adhesive comprises the following components in percentage by weight: bulk density of about 450g/L, carbon-containing powder: the content of residual carbon is 85%, and the ratio of graphite: the content of C is more than or equal to 97 percent, and the content of boron carbide is as follows: the content of B4C is more than or equal to 90 percent, the aluminum magnesium alloy powder: the Al content is 50 +/-3%, the active metal (Al + Mg) is not less than 97.0%, and the silicon powder: the content of Si is more than or equal to 97 percent, and the weight percentage of the resin is as follows: the residual carbon content is 45 +/-4%, the solid content is 75-80%, and the viscosity is 15000-18000 mpa.
6. The preparation method of the high-performance magnesium sliding brick according to claim 1, wherein 97 electric melting magnesite, forsterite, electric melting spinel, high-temperature burning promoting powder, ceramic plastic adhesive, carbon-containing powder, graphite, boron carbide, aluminum-magnesium alloy powder, silicon powder, resin and resin reinforcing agent are mixed in proportion, then the mixture is molded and naturally dried, then the mixture is put into a drying kiln to be slowly heated and dried for 40-60 hours, the temperature of the drying kiln is preferably not more than 180-190 ℃, then the mixture is pushed into a medium-high temperature tunnel kiln to be uniformly heated to 580 +/-20 ℃, the temperature is kept for 15-20 hours, and finally the temperature is uniformly reduced for 16-25 hours.
7. The method of claim 6, wherein the temperature of the kiln is uniformly raised to 80 ℃ within 1 hour and maintained at 80 ℃ for 12 hours, and then the temperature is uniformly raised from 80 ℃ to 190 ℃ within 24 hours and maintained at 190 ℃ for 20 hours.
8. The preparation method of the high-performance magnesium sliding brick according to claim 7, wherein the temperature is uniformly increased to 580 ℃ ± 20 ℃ within 15-20 hours, and finally the temperature is reduced at a constant speed for 20 hours.
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| CN116589287A (en) * | 2023-01-08 | 2023-08-15 | 无锡市南方耐材有限公司 | Low-cost and long-service-life sliding plate brick and preparation method thereof |
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