CN114075081B - Plastic high-temperature ceramic sealing gasket for ladle sliding gate and preparation method thereof - Google Patents
Plastic high-temperature ceramic sealing gasket for ladle sliding gate and preparation method thereof Download PDFInfo
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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
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- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
- C04B2235/02—Composition of constituents of the starting material or of secondary phases of the final product
- C04B2235/30—Constituents and secondary phases not being of a fibrous nature
- C04B2235/32—Metal oxides, mixed metal oxides, or oxide-forming salts thereof, e.g. carbonates, nitrates, (oxy)hydroxides, chlorides
- C04B2235/3205—Alkaline earth oxides or oxide forming salts thereof, e.g. beryllium oxide
- C04B2235/3206—Magnesium oxides or oxide-forming salts thereof
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- C—CHEMISTRY; METALLURGY
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- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
- C04B2235/02—Composition of constituents of the starting material or of secondary phases of the final product
- C04B2235/30—Constituents and secondary phases not being of a fibrous nature
- C04B2235/32—Metal oxides, mixed metal oxides, or oxide-forming salts thereof, e.g. carbonates, nitrates, (oxy)hydroxides, chlorides
- C04B2235/3217—Aluminum oxide or oxide forming salts thereof, e.g. bauxite, alpha-alumina
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- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
- C04B2235/02—Composition of constituents of the starting material or of secondary phases of the final product
- C04B2235/30—Constituents and secondary phases not being of a fibrous nature
- C04B2235/32—Metal oxides, mixed metal oxides, or oxide-forming salts thereof, e.g. carbonates, nitrates, (oxy)hydroxides, chlorides
- C04B2235/3217—Aluminum oxide or oxide forming salts thereof, e.g. bauxite, alpha-alumina
- C04B2235/3222—Aluminates other than alumino-silicates, e.g. spinel (MgAl2O4)
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- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
- C04B2235/02—Composition of constituents of the starting material or of secondary phases of the final product
- C04B2235/30—Constituents and secondary phases not being of a fibrous nature
- C04B2235/38—Non-oxide ceramic constituents or additives
- C04B2235/3817—Carbides
- C04B2235/3826—Silicon carbides
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- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
- C04B2235/02—Composition of constituents of the starting material or of secondary phases of the final product
- C04B2235/30—Constituents and secondary phases not being of a fibrous nature
- C04B2235/40—Metallic constituents or additives not added as binding phase
- C04B2235/402—Aluminium
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- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
- C04B2235/02—Composition of constituents of the starting material or of secondary phases of the final product
- C04B2235/30—Constituents and secondary phases not being of a fibrous nature
- C04B2235/42—Non metallic elements added as constituents or additives, e.g. sulfur, phosphor, selenium or tellurium
- C04B2235/428—Silicon
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- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
- C04B2235/70—Aspects relating to sintered or melt-casted ceramic products
- C04B2235/96—Properties of ceramic products, e.g. mechanical properties such as strength, toughness, wear resistance
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- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
- C04B2235/70—Aspects relating to sintered or melt-casted ceramic products
- C04B2235/96—Properties of ceramic products, e.g. mechanical properties such as strength, toughness, wear resistance
- C04B2235/9607—Thermal properties, e.g. thermal expansion coefficient
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Abstract
The invention discloses a plastic high-temperature ceramic sealing gasket for a ladle sliding gate, which comprises an outer layer raw material and an inner layer raw material according to a raw material formula; the inner layer comprises the following raw materials in parts by weight: alumina, magnesia-alumina spinel, silicon carbide, metallic silicon, modified alumina sol and adhesive; the outer layer is made of graphite material. The composite material has excellent plastic deformation performance, high-temperature use performance and processability, can generate irreversible plastic deformation to be filled between contact parts of the sliding plate and the water gap of the sliding plate, can not crack in the transportation and processing processes, can form a very good combination body between the sliding plate and the water gap of the sliding plate due to the local sintering effect generated in the use process, has good sealing performance, and solves the hidden danger of steel leakage generated at the position.
Description
Technical Field
The invention relates to the technical field of refractory materials in metallurgical industry, in particular to a plastic high-temperature ceramic sealing gasket for a ladle sliding gate and a preparation method thereof.
Background
In a steelmaking continuous casting facility, a sliding gate nozzle, which is one of the most critical components, is a molten steel control device during casting in a continuous casting machine, and is capable of precisely adjusting the flow of molten steel from a ladle to a continuous casting tundish, balancing the inflow and outflow of molten steel, thereby making the continuous casting operation easier to control, and is an indispensable part of a smelting facility.
The sliding gate valve generally consists of a driving device, a mechanical part and a refractory material part (i.e. an up-down slide plate, a slide plate gate valve). Before leaving a factory, the sliding plate and the water gap of the sliding plate are connected in a sealing way, at present, paste refractory mortar is generally used for bonding and sealing in China, the refractory mortar is formed by adding a bonding agent, water and the like into refractory material powder and mixing, and enough strength can be generated only by high-temperature sintering. When the refractory mortar is used, firstly, the pasty slurry is smeared on the surfaces of the sliding plate and the sliding plate nozzle, and the sliding plate nozzle are tightly pressed, and then, a thin steel plate is used for packaging, and then, baking treatment is carried out, so that the slurry generates bonding strength. As the sliding plate and the sliding plate water gap combined by the slurry are finished products, only medium and low temperature drying treatment (about 100 ℃) can be carried out, the bonding strength of the refractory mortar is very low and is about below 3MPa, the refractory mortar inevitably cracks and the like due to low strength in the processing and transportation links, so that the defects of cracks and the like between the sliding plate and the sliding plate water gap are caused, and the accidents of molten steel leakage and the like easily occur in the using process of the product.
Disclosure of Invention
In order to solve the problems existing in the background technology, the invention provides a plastic high-temperature ceramic sealing gasket for a ladle sliding nozzle, which has excellent plastic deformation performance, high-temperature service performance and processability, can generate irreversible plastic deformation to be filled between the contact parts of a sliding plate and the sliding plate nozzle, can not crack in the transportation and processing processes, can form a very good combination body between the sliding plate and the sliding plate nozzle due to the local sintering action generated in the using process, has good sealing performance, and solves the hidden danger of steel leakage and the like of the part. Therefore, the invention also provides a preparation method of the plastic high-temperature ceramic sealing gasket for the ladle sliding nozzle.
In order to achieve the purpose, the invention adopts the following technical scheme:
the invention provides a plastic high-temperature ceramic sealing gasket for a ladle sliding gate, which comprises an outer layer raw material and an inner layer raw material according to a raw material formula;
the inner layer comprises the following raw materials in parts by weight: 65-80 parts of aluminum oxide, 20-30 parts of magnesium oxide, 20-40 parts of magnesium aluminate spinel, 10-30 parts of silicon carbide, 5-10 parts of metallic silicon, 20-30 parts of modified alumina sol and 2-6 parts of adhesive;
the outer layer raw material comprises 2-30 parts of graphite.
The modified aluminum sol in the inner layer raw material is formed by mixing aluminum sol and silica sol.
The modified aluminum sol in the inner layer raw material is prepared from the following raw materials in percentage by mass of 1: and (1-3) mixing the aluminum sol and the silica sol.
Wherein the adhesive is aluminum dihydrogen phosphate.
The second aspect of the invention provides a preparation method of the plastic high-temperature ceramic sealing gasket for the ladle sliding nozzle, which comprises the following steps:
s1, weighing each component in the outer layer raw material and the inner layer raw material according to corresponding raw material formulas;
s2, adding the components of the outer layer raw material and the inner layer raw material from which the modified alumina sol and the adhesive are removed into two groups of stirring mixers respectively, and stirring until the components are uniformly mixed;
s3, adding the modified alumina sol and the adhesive in the inner layer raw material into a corresponding stirring mixer, and continuously stirring to obtain a mixed material;
s4, respectively adding the mixed materials obtained in the two groups of stirring mixers into a die for roll forming, and then extruding and integrally forming the layers by using an extruder to obtain a blank body which is pressed into a specific shape and has a laminated structure;
and S5, placing the obtained molded blank body in a constant temperature and humidity environment for curing treatment to obtain a finished product.
The third aspect of the invention provides a method for using a plastic high-temperature ceramic sealing gasket for a ladle sliding nozzle, which comprises the steps of directly placing the ceramic sealing gasket between a sliding plate and a sliding plate nozzle, compacting by adopting extrusion equipment until the surfaces of the ceramic sealing gasket, the sliding plate and the sliding plate nozzle are completely matched, and then pressing and packaging the sliding plate and the sliding plate nozzle by using a thin steel plate.
Compared with the prior art, the invention has the following beneficial effects:
the ceramic sealing gasket prepared by using various high-temperature refractory raw materials (alumina, magnesia alumina spinel, silicon carbide and metallic silicon) as main raw materials and adopting modified alumina sol and aluminum dihydrogen phosphate as a combination system has good high-temperature service performance (the refractoriness is more than or equal to 1790 ℃), excellent plastic deformation performance and tear resistance (the plasticity index is more than or equal to 50 percent and the tear resistance is more than or equal to 1.5 MPa), and the product can generate irreversible plastic deformation and is filled between the contact parts of the sliding plate and the water gap of the sliding plate, so that the product cannot crack in the transportation and processing processes, and a local sintering effect generated at high temperature in use forms a very good combination body between the sliding plate and the water gap of the sliding plate, has good sealing performance, and solves the hidden danger of steel leakage and the like of the parts; in the preparation process, the die is manufactured according to the requirements of the use part, the required shape is formed by extrusion forming, and the processability of the product is strong. The product is convenient to produce, more environment-friendly, lower in cost, convenient to install and transport, does not need heat treatment, and can not produce damage and the like in the processes of processing, transporting and using, thereby leading to the occurrence of steel infiltration.
Detailed Description
Example 1
The preparation method of the plastic high-temperature ceramic sealing gasket for the ladle sliding nozzle comprises the following steps:
s1, weighing each component in the outer layer raw material and the inner layer raw material according to corresponding raw material formulas;
the components in the outer layer raw material: 30kg of graphite;
the components in the inner layer raw material: 75kg of alumina, 21kg of magnesia, 40kg of magnesia-alumina spinel, 10kg of silicon carbide, 9kg of metallic silicon, 20kg of modified alumina sol (a mixture of alumina sol and silica sol in a mass ratio of 1;
s2, adding the components of the outer layer raw material and the inner layer raw material from which the modified alumina sol and the adhesive are removed into two groups of stirring mixers respectively, and stirring until the components are uniformly mixed;
s3, adding the modified alumina sol and the adhesive in the inner layer raw material into a corresponding stirring mixer, and continuously stirring to obtain a mixed material;
s4, respectively adding the mixed materials obtained in the two stirring and mixing machines into a mould for roll forming, and then extruding all layers by an extruder to integrally form to obtain a blank body which is pressed into a specific shape and has a laminated structure;
and S5, placing the obtained molded blank in a constant-temperature and constant-humidity environment for curing treatment to obtain a finished product.
When the ceramic sealing gasket is used, the ceramic sealing gasket is directly placed between the sliding plate and the sliding plate water gap, the ceramic sealing gasket is compressed by adopting an extruding device until the surfaces of the ceramic sealing gasket, the sliding plate and the sliding plate water gap are completely coincided, and then the sliding plate and the sliding plate water gap are pressed and packaged by using a thin steel plate under the action of a constant pressure machine according to the process requirements.
Example 2
The preparation method of the plastic high-temperature ceramic sealing gasket for the ladle sliding gate comprises the following steps:
s1, weighing each component in the outer layer raw material and the inner layer raw material according to corresponding raw material formulas;
the components in the outer layer raw material: 15kg of graphite;
the components in the inner layer raw material: 69kg of alumina, 28kg of magnesia, 35kg of magnesium aluminate spinel, 26kg of silicon carbide, 6kg of metallic silicon, 23kg of modified alumina sol (a mixture of alumina sol and silica sol in a mass ratio of 1;
s2, adding the components of the outer layer raw material and the inner layer raw material from which the modified alumina sol and the adhesive are removed into two groups of stirring mixers respectively, and stirring until the components are uniformly mixed;
s3, adding the modified alumina sol and the adhesive in the inner layer raw material into a corresponding stirring mixer, and continuously stirring to obtain a mixed material;
s4, respectively adding the mixed materials obtained in the two groups of stirring mixers into a die for roll forming, and then extruding and integrally forming the layers by using an extruder to obtain a blank body which is pressed into a specific shape and has a laminated structure;
and S5, placing the obtained molded blank in a constant-temperature and constant-humidity environment for curing treatment to obtain a finished product.
The method of using the ceramic gasket was the same as in example 1.
Example 3
The preparation method of the plastic high-temperature ceramic sealing gasket for the ladle sliding gate comprises the following steps:
s1, weighing each component in the outer layer raw material and the inner layer raw material according to corresponding raw material formulas;
the components in the outer layer raw material: 21kg of graphite;
the components in the inner layer raw material: 76kg of alumina, 30kg of magnesia, 32kg of magnesia-alumina spinel, 30kg of silicon carbide, 10kg of metallic silicon, 30kg of modified alumina sol (a mixture of alumina sol and silica sol in a mass ratio of 1;
s2, adding the components of the outer layer raw material and the inner layer raw material from which the modified alumina sol and the adhesive are removed into two groups of stirring mixers respectively, and stirring until the components are uniformly mixed;
s3, adding the modified alumina sol and the adhesive in the inner layer raw material into a corresponding stirring mixer, and continuously stirring to obtain a mixed material;
s4, respectively adding the mixed materials obtained in the two groups of stirring mixers into a die for roll forming, and then extruding and integrally forming the layers by using an extruder to obtain a blank body which is pressed into a specific shape and has a laminated structure;
and S5, placing the obtained molded blank in a constant-temperature and constant-humidity environment for curing treatment to obtain a finished product.
The method of using the ceramic gasket was the same as in example 1.
Example 4
The preparation method of the plastic high-temperature ceramic sealing gasket for the ladle sliding nozzle comprises the following steps:
s1, weighing each component in the outer layer raw material and the inner layer raw material according to corresponding raw material formulas;
the components in the outer layer raw material: 15kg of graphite;
the components in the inner layer raw material: 80kg of alumina, 20kg of magnesia, 23kg of magnesia-alumina spinel, 13kg of silicon carbide, 7kg of metallic silicon, 20kg of modified alumina sol (a mixture of alumina sol and silica sol in a mass ratio of 1;
s2, adding the components of the outer layer raw material and the inner layer raw material from which the modified alumina sol and the adhesive are removed into two groups of stirring mixers respectively, and stirring until the components are uniformly mixed;
s3, adding the modified alumina sol and the adhesive in the inner layer raw material into a corresponding stirring mixer, and continuously stirring to obtain a mixed material;
s4, respectively adding the mixed materials obtained in the two groups of stirring mixers into a die for roll forming, and then extruding and integrally forming the layers by using an extruder to obtain a blank body which is pressed into a specific shape and has a laminated structure;
and S5, placing the obtained molded blank body in a constant temperature and humidity environment for curing treatment to obtain a finished product.
The method of using the ceramic gasket was the same as in example 1.
Example 5
The preparation method of the plastic high-temperature ceramic sealing gasket for the ladle sliding gate comprises the following steps:
s1, weighing each component in the outer layer raw material and the inner layer raw material according to corresponding raw material formulas;
the components in the outer layer raw material: 2kg of graphite;
the components in the inner layer raw material: 65kg of alumina, 27kg of magnesia, 20kg of magnesium aluminate spinel, 19kg of silicon carbide, 5kg of metallic silicon, 22kg of modified alumina sol (a mixture of alumina sol and silica sol in a mass ratio of 1;
s2, adding the components of the outer layer raw material and the inner layer raw material from which the modified alumina sol and the adhesive are removed into two groups of stirring mixers respectively, and stirring until the components are uniformly mixed;
s3, adding the modified alumina sol and the adhesive in the inner layer raw material into a corresponding stirring mixer, and continuously stirring to obtain a mixed material;
s4, respectively adding the mixed materials obtained in the two groups of stirring mixers into a die for roll forming, and then extruding and integrally forming the layers by using an extruder to obtain a blank body which is pressed into a specific shape and has a laminated structure;
and S5, placing the obtained molded blank in a constant-temperature and constant-humidity environment for curing treatment to obtain a finished product.
The method of using the ceramic gasket was the same as in example 1.
The ceramic gaskets prepared in examples 1 to 5 were subjected to tests for plastic deformability, tear resistance, and fire resistance, and the test results are shown in table 1.
Plastic deformability was examined according to QB/T1322-2010.
Tear resistance was tested according to GB/T7985-1987.
The fire resistance was tested according to GB/T7322-2007.
TABLE 1
As shown in Table 1, the ceramic sealing gaskets prepared in the embodiments 1 to 5 have good high-temperature service performance (the refractoriness is more than or equal to 1790 degrees), excellent plastic deformation performance and tear resistance (the plasticity index is more than or equal to 50 percent, and the tear resistance is more than or equal to 1.5 MPa), irreversible plastic deformation can be generated in the product to fill the contact part between the sliding plate and the sliding plate nozzle, cracking cannot be generated in the transportation and processing processes, local sintering is generated at high temperature during use, so that a very good combination is formed between the sliding plate and the sliding plate nozzle, the sealing performance is good, the hidden danger of steel leakage and the like in the part are solved.
Claims (3)
1. The plastic high-temperature ceramic sealing gasket for the ladle sliding gate is characterized in that the raw material formula of the ceramic sealing gasket consists of an outer layer raw material and an inner layer raw material;
the inner layer comprises the following raw materials in parts by weight: 65-80 parts of aluminum oxide, 20-30 parts of magnesium oxide, 20-40 parts of magnesium aluminate spinel, 10-30 parts of silicon carbide, 5-10 parts of metallic silicon, 20-30 parts of modified alumina sol and 2-6 parts of adhesive;
the outer layer is made of graphite material;
the modified alumina sol in the inner layer raw material is prepared from the following raw materials in a mass ratio of 1: (1-3) mixing the aluminum sol and the silica sol;
the adhesive is aluminum dihydrogen phosphate.
2. A method for preparing a plastic high-temperature ceramic seal gasket for a ladle sliding gate according to claim 1, comprising the steps of:
s1, weighing each component in the outer layer raw material and the inner layer raw material according to corresponding raw material formulas;
s2, adding the components of the outer layer raw material and the inner layer raw material from which the modified alumina sol and the adhesive are removed into two groups of stirring mixers respectively, and stirring until the components are uniformly mixed;
s3, adding the modified alumina sol and the adhesive in the inner layer raw material into a corresponding stirring mixer, and continuously stirring to obtain a mixed material;
s4, respectively adding the mixed materials obtained in the two stirring and mixing machines into a mould for roll forming, and then extruding all layers by an extruder to integrally form to obtain a blank body which is pressed into a specific shape and has a laminated structure;
and S5, placing the obtained molded blank in a constant-temperature and constant-humidity environment for curing treatment to obtain a finished product.
3. A method for using the plastic high-temperature ceramic sealing gasket for the ladle sliding nozzle is characterized in that the ceramic sealing gasket in claim 1 is directly placed between a sliding plate and a sliding plate nozzle, and is compressed by adopting extrusion equipment until the surfaces of the ceramic sealing gasket, the sliding plate and the sliding plate nozzle are completely matched, and then a thin steel plate is used for pressing and packaging the sliding plate and the sliding plate nozzle.
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| JP2623191B2 (en) * | 1992-05-08 | 1997-06-25 | 新日本製鐵株式会社 | Refractories for continuous casting |
| US6637629B2 (en) * | 2000-04-18 | 2003-10-28 | Toshiba Ceramics Co., Ltd. | Immersion nozzle |
| CN102335739B (en) * | 2010-07-26 | 2013-06-19 | 宝山钢铁股份有限公司 | Compound silicon-free long nozzle and manufacturing method thereof |
| CN102503461B (en) * | 2011-10-21 | 2014-06-18 | 山东东耐高温材料股份有限公司 | Submerged argon blowing nozzle for continuously casting metals and preparation method thereof |
| CN105016742B (en) * | 2014-04-24 | 2017-04-26 | 宝山钢铁股份有限公司 | Coating for sealing continuous casting nozzle, as well as preparation method and application of coating |
| CN105642877B (en) * | 2016-01-26 | 2018-01-02 | 辽宁科技大学 | Silicon carbide whisker combination high-strength compound submersed nozzle and manufacture method |
| CN209424539U (en) * | 2018-11-20 | 2019-09-24 | 山东钢铁股份有限公司 | The big packet long nozzle of molten steel nitrogen increased amount in a kind of reduction continuous casting process |
| CN109382506B (en) * | 2018-11-20 | 2020-10-23 | 山东钢铁股份有限公司 | Method for reducing nitrogen increase of molten steel in continuous casting process |
| CN210648470U (en) * | 2019-08-27 | 2020-06-02 | 上海劲远高温材料有限公司 | High-temperature sealing device for connection between ladle down nozzle and slide plate nozzle |
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