CN107399976B - Refractory material for centrifugal large-scale bar roll end cover and end cover manufacturing method - Google Patents
Refractory material for centrifugal large-scale bar roll end cover and end cover manufacturing method Download PDFInfo
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- CN107399976B CN107399976B CN201710482161.2A CN201710482161A CN107399976B CN 107399976 B CN107399976 B CN 107399976B CN 201710482161 A CN201710482161 A CN 201710482161A CN 107399976 B CN107399976 B CN 107399976B
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/66—Monolithic refractories or refractory mortars, including those whether or not containing clay
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D13/00—Centrifugal casting; Casting by using centrifugal force
- B22D13/10—Accessories for centrifugal casting apparatus, e.g. moulds, linings therefor, means for feeding molten metal, cleansing moulds, removing castings
- B22D13/101—Moulds
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- 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
- C04B2235/32—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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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- 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
- C04B2235/32—Metal oxides, mixed metal oxides, or oxide-forming salts thereof, e.g. carbonates, nitrates, (oxy)hydroxides, chlorides
- C04B2235/3231—Refractory metal oxides, their mixed metal oxides, or oxide-forming salts thereof
- C04B2235/3244—Zirconium oxides, zirconates, hafnium oxides, hafnates, or oxide-forming salts thereof
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- 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
- C04B2235/34—Non-metal oxides, non-metal mixed oxides, or salts thereof that form the non-metal oxides upon heating, e.g. carbonates, nitrates, (oxy)hydroxides, chlorides
- C04B2235/3418—Silicon oxide, silicic acids, or oxide forming salts thereof, e.g. silica sol, fused silica, silica fume, cristobalite, quartz or flint
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- Mechanical Engineering (AREA)
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Abstract
The invention provides a refractory material for a centrifugal large-scale bar roller end cover and a manufacturing method of the end cover containing the refractory material, wherein the refractory material comprises the following components in percentage by mass: 25-35% of bauxite, 8-10% of zircon powder, 12-15% of high-alumina cement, 35-45% of silicon dioxide powder and 5-10% of water; the bauxite comprises the following components in percentage by weight: bauxite with the granularity of 3-8mm accounts for 10-15%, and bauxite with the granularity of 1-3mm accounts for 15-25%. The refractory material for the roller end cover has the characteristics of high strength and high refractoriness, has good adhesive force with the end cover, is not easy to fall off when a centrifugal large bar roller is poured, can ensure that the end cover is not damaged and molten iron does not run out, effectively solves the problem of slag inclusion generated in a roller composite area, and well ensures the production safety and the product quality.
Description
Technical Field
The invention belongs to the technical field of centrifugal rolls, and particularly relates to a refractory material for a centrifugal large bar roll end cover and a manufacturing method of the end cover.
Background
The roller is important metallurgical equipment in steel rolling production and is one of main consumption equipment, and the consumption of the roller is about 5-15% of the production cost of steel rolling. In order to improve the quality of the roller and reduce the production cost of the roller, the roller is generally produced by adopting a centrifugal casting mode in the existing roller enterprises at home and abroad. The quality of the roll not only relates to the production cost of steel rolling and the production efficiency of a rolling mill, but also influences the quality of a rolled material to a great extent. With the continuous development of the roller production technology, the wear resistance, the strength and the toughness of the existing roller are greatly improved.
The method for manufacturing the roller comprises two methods of forging and casting, and the centrifugal casting roller is a main production process of the roller at the present stage due to the obvious advantages of the centrifugal casting roller, particularly the characteristic of casting the bimetal composite roller. In the process of producing the rough defects of the roller by centrifugal casting, end covers are often placed at the front end and the rear end of a mold, so that a cavity is formed between the mold and the front end cover and the rear end cover, a casting shape is placed on a centrifugal casting machine during casting, molten iron is injected into a rotating cavity, the molten iron forms the outer rough defects of the roller on the inner surface of the cavity by utilizing the centrifugal action, then a cold mold is taken down, and a roller core part is cast, so that the casting rough defects of the solid roller are obtained.
Most of the existing end covers are iron end covers, a fireproof cement layer with the thickness of 50-500mm is generally punched on the working surface of the end cover, and the end cover is produced and used after the fireproof cement layer is dried. However, the refractory cement layer has the defects of poor strength and lower refractoriness, in the production process of a centrifugal large-scale bar roller, the temperature of molten metal generally reaches a high temperature of more than 1200 ℃, the molten metal rotates at a high speed under the action of centrifugal force, so that the refractory cement layer is easy to wear and thermally fatigue, the high-temperature strength and the thermal shock resistance are not enough, the adhesive force between the refractory cement layer and an end cover is not enough, the refractory cement layer is easy to fall off after being impacted by the high-temperature molten metal, the end cover molding sand is easy to damage, the internal molten metal is easy to overflow, potential safety hazards are caused, and the problem of slag inclusion in a roller composite area is caused.
Disclosure of Invention
In order to solve the technical problems, the invention aims to provide a refractory material for a centrifugal large-sized bar roller end cover and a preparation method of the end cover.
In order to achieve the first purpose of the invention, the technical scheme adopted by the invention is that the refractory material for the end cover of the centrifugal large bar roller comprises the following components in percentage by mass: 25-35% of bauxite, 8-10% of zircon powder, 12-15% of high-alumina cement, 35-45% of silicon dioxide powder and 5-10% of water; the bauxite comprises the following components in percentage by weight: bauxite with the granularity of 3-8mm accounts for 10-15%, and bauxite with the granularity of 1-3mm accounts for 15-25%.
The refractory material provided by the invention is coated on the end cover surface of the roller, has the characteristics of high porosity, small heat conductivity coefficient and the like, can ensure that the refractory material has excellent heat insulation and gas storage properties, has the characteristics of high refractoriness, small thermal expansion rate, good high-temperature stability and the like, can effectively enhance the bonding property between a surface layer material and a bottom layer material as well as an end cover, is not easy to damage end cover molding sand when a centrifugal large-sized bar roller is cast, and can effectively prevent molten iron from overflowing and slag inclusion.
As a preferable technical scheme, the particle size of the zircon powder is 100-150 meshes.
As a preferable technical scheme, the particle size of the silicon dioxide powder is 10-15 um.
The second purpose of the invention is to provide a manufacturing method of a centrifugal large bar roll end cover containing the refractory material, which comprises the following steps:
(1) Adding water with the total water amount of 30-40% and the temperature of 55-60 ℃ into bauxite with the granularity of 3-8mm to prepare slurry, uniformly paving the slurry on the surface of a roller end cover, checking the flatness of the surface, and carrying out flattening treatment if the unevenness is more than 5 mm;
(2) Fully mixing zircon powder, silicon dioxide powder and high-alumina cement, adding water with the total water content of 25-35% and the temperature of 55-60 ℃ into the mixture, fully wetting and uniformly stirring the mixture, then paving the mixture on the surface of the slurry obtained in the step (1), checking the flatness of the surface, and carrying out flattening treatment if the unevenness is more than 3 mm;
(3) Uniformly jolting the surface of the product obtained in the step (2), leveling the surface by using a ruler with the surface slurry outlet as the standard, and polishing the surface until no hole exists and no bubble exists;
(4) Adding the rest amount of water at room temperature into bauxite with the granularity of 1-3mm, uniformly mixing, paving the bauxite on the surface of the product obtained in the step (3), modeling an end cover, and naturally placing for more than 48 hours to enter a kiln for baking;
(5) And (5) obtaining the molded roller end cover after baking, and carrying out process index detection.
As a preferable technical scheme, the particle size of the zircon powder in the step (2) is 100-150 meshes.
As a preferable technical scheme, the particle size of the silicon dioxide powder in the step (2) is 10-15 μm.
The invention selects bauxite, zircon powder, high-alumina cement and silicon dioxide powder as main refractory base materials. Because the melting point of the zircon powder is as high as 1775 ℃, the zircon powder has good heat resistance, small linear expansion coefficient, good thermal shock stability and high refractoriness, and does not have chemical reaction on most alloys at high temperature, but when the zircon powder is used as a base material, the zircon powder has poor heat insulation performance, a casting mould is easy to be affected by thermal shock, the service life is short, the surface of a roller is easy to crack, and the zircon powder has high density, so that the zircon powder has poor suspension property when being coated on the surface of an end cover as a refractory material. The silicon dioxide powder has higher refractoriness, basically has no change of structure when the temperature is less than 1350 ℃, can still maintain higher heat insulation performance, and has more applications in refractory materials. The high-alumina cement is a hydraulic gel material and is often used as a binding agent in a refractory material, but the high-alumina cement has a serious strength reduction phenomenon at the temperature of 900-1200 ℃, so that the refractory material is easy to crack and fall off in the centrifugal rotation process of molten metal, end cover molding sand is easy to damage, and the internal molten metal is easy to overflow.
The invention mixes the zircon powder, the silicon dioxide powder and the high-alumina cement, wherein the grain diameter of the zircon powder is between 100 and 150 meshes, and the grain diameter of the aluminum dioxide powder is between 10 and 15 mu m. The high-alumina cement can be mixed with water to generate hydration reaction, and a crystalline grid structure can be formed on the surface of the end cover, so that the strength of the material is improved; when electrostatic repulsion on the surface of the colloidal particles is smaller than attraction, the colloidal particles are subjected to condensation and combination due to the van der Waals force among the molecules, a siloxane network structure can be formed, so that the material is hardened, and the strength is improved; the zircon powder with high fire resistance and low expansion coefficient can be effectively attached between a crystal grid structure formed by high-alumina cement and a siloxane net structure formed by silicon dioxide powder, the defects of high density and poor suspension of the zircon powder are well overcome, the zircon powder can be tightly embedded into a net to form a compact fire-resistant layer with good fire resistance, high-temperature resistance and high thermal shock resistance, the adhesive force is strong, and the fire-resistant layer is not easy to fall off due to the impact of high-temperature molten metal. Through the particle diameter of selecting above-mentioned zircon powder and the particle diameter of silica powder, can make silica powder form stable network structure, and among zircon powder both ends can imbed high alumina cement crystallization rack and silica powder network structure simultaneously, improved the phenomenon that high alumina cement is easy to split and takes place to drop greatly.
The invention selects bauxite with different granularities as a surface layer material and a bottom layer material, and is tightly combined with the grid structure at the same time, the bauxite granularity of the working surface of the end cover is selected to be between 1 and 3mm, so that a compact heat insulation layer is formed on the surface of the end cover, the high temperature resistance and the thermal shock resistance of the material are further improved, the wear resistance and the thermal fatigue resistance are greatly enhanced, the bauxite with the granularity of 3 to 8mm is selected as the bottom layer material to be bonded with the end cover, the invention has the advantages of high porosity and good heat insulation, the mixed high-strength refractory material formed by zircon powder, silicon dioxide powder and high alumina cement in the middle layer has high refractoriness, small expansion coefficient and good thermal shock stability, the invention can greatly enhance the strength and refractoriness of the end cover of the centrifugal roller when being used on the end cover of the roller, the bonding performance between the end cover is good, and the refractory material layer can not fall off due to the, the end cover cannot be damaged, and the problem of slag inclusion generated in the roller composite area can be effectively solved.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the present invention is described in detail below with reference to the following embodiments, and it should be noted that the following embodiments are only for explaining and illustrating the present invention and are not intended to limit the present invention. The invention is not limited to the embodiments described above, but rather, may be modified within the scope of the invention.
Example 1
The refractory material for the centrifugal large-sized bar roller end cover comprises the following components in percentage by mass: 25% of bauxite, 10% of zircon powder, 15% of high-alumina cement, 40% of silicon dioxide powder and 10% of water; the bauxite comprises the following components in percentage by weight: bauxite with the granularity of 3-8mm accounts for 10 percent, and bauxite with the granularity of 1-3mm accounts for 15 percent; the particle size of the zircon powder is 100-150 meshes, and the particle size of the silicon dioxide powder is 10-15 mu m.
The manufacturing method of the roll end cover with the refractory material comprises the following steps:
(1) Firstly, adding 30 percent of water and 55 ℃ water into bauxite with the granularity of 3-8mm to prepare slurry, then uniformly paving the slurry on the surface of a roller end cover, and checking the surface flatness to ensure that the unevenness is less than or equal to 5 mm;
(2) Fully mixing zircon powder, silicon dioxide powder and high-alumina cement, adding water with the total water content of 25% and the temperature of 55 ℃ into the mixture, fully wetting and uniformly stirring the mixture, then paving the mixture on the surface of the slurry obtained in the step (1), and checking the surface flatness to ensure that the unevenness is less than or equal to 5 mm;
(3) Uniformly jolting the surface of the product obtained in the step (2), leveling the surface by using a ruler with the surface slurry outlet as the standard, and polishing the surface until no hole exists and no bubble exists;
(4) Adding the rest amount of water at room temperature into bauxite with the granularity of 1-3mm, uniformly mixing, paving the bauxite on the surface of the product obtained in the step (3), modeling an end cover, and naturally placing for more than 48 hours to enter a kiln for baking;
(5) And (5) obtaining the molded roller end cover after baking, and carrying out process index detection.
The end cover is used for casting a centrifugal large bar roller, the refractory material can be used completely at the high temperature of 1400 ℃, the surface of the material is not damaged, the high-temperature strength and the thermal shock resistance are excellent, the use frequency reaches more than 1000 times, the surface of the material is basically unchanged, the contact surface with the end cover is good, the falling-off phenomenon is avoided, the molding sand of the end cover is not damaged in the use process, the overflow phenomenon of molten metal is avoided, and slag inclusion is not generated in a roller composite area.
Example 2
The refractory material for the centrifugal large-sized bar roller end cover comprises the following components in percentage by mass: 35% of bauxite, 8% of zircon powder, 12% of high-alumina cement, 45% of silicon dioxide powder and 5% of water; the bauxite comprises the following components in percentage by weight: 15% of bauxite with the granularity of 3-8mm and 20% of bauxite with the granularity of 1-3 mm; the particle size of the zircon powder is 100-150 meshes, and the particle size of the silicon dioxide powder is 10-15 mu m.
The manufacturing method of the roll end cover with the refractory material comprises the following steps:
(1) Adding water with the total water amount of 40% and the temperature of 60 ℃ into bauxite with the granularity of 3-8mm to prepare slurry, then uniformly paving the slurry on the surface of a roller end cover, and checking the surface flatness to ensure that the unevenness is less than or equal to 5 mm;
(2) Fully mixing zircon powder, silicon dioxide powder and high-alumina cement, adding water with the total water content of 35% and the temperature of 60 ℃ into the mixture, fully wetting and uniformly stirring the mixture, then paving the mixture on the surface of the slurry obtained in the step (1), and checking the surface flatness to ensure that the unevenness is less than or equal to 5 mm;
(3) Uniformly jolting the surface of the product obtained in the step (2), leveling the surface by using a ruler with the surface slurry outlet as the standard, and polishing the surface until no hole exists and no bubble exists;
(4) Adding the rest amount of water at room temperature into bauxite with the granularity of 1-3mm, uniformly mixing, paving the bauxite on the surface of the product obtained in the step (3), modeling an end cover, and naturally placing for more than 48 hours to enter a kiln for baking;
(5) And (5) obtaining the molded roller end cover after baking, and carrying out process index detection.
The end cover is used for casting a centrifugal large bar roller, the refractory material can be used completely at the high temperature of 1500 ℃, the surface of the material is not damaged, the high-temperature strength and the thermal shock resistance are excellent, the use frequency reaches more than 1500, the surface of the material is basically unchanged, the contact surface with the end cover is good, the falling-off phenomenon is avoided, the molding sand of the end cover is not damaged in the use process, the overflow phenomenon of molten metal is avoided, and slag inclusion is not generated in a roller composite area.
Example 3
The refractory material for the centrifugal large-sized bar roller end cover comprises the following components in percentage by mass: 30% of bauxite, 10% of zircon powder, 14% of high-alumina cement, 38% of silicon dioxide powder and 8% of water; the bauxite comprises the following components in percentage by weight: 12 percent of bauxite with the granularity of 3-8mm and 18 percent of bauxite with the granularity of 1-3 mm; the particle size of the zircon powder is 100-150 meshes, and the particle size of the silicon dioxide powder is 10-15 mu m.
The manufacturing method of the roll end cover with the refractory material comprises the following steps:
(1) Firstly, adding 35 percent of water and 58 ℃ water into bauxite with the granularity of 3-8mm to prepare slurry, then uniformly paving the slurry on the surface of a roller end cover, and checking the surface flatness to ensure that the unevenness is less than or equal to 5 mm;
(2) Fully mixing zircon powder, silicon dioxide powder and high-alumina cement, adding water with the total water content of 25% and the temperature of 58 ℃ into the mixture, fully wetting and uniformly stirring the mixture, then paving the mixture on the surface of the slurry obtained in the step (1), and checking the surface flatness to ensure that the unevenness is less than or equal to 5 mm;
(3) Uniformly jolting the surface of the product obtained in the step (2), leveling the surface by using a ruler with the surface slurry outlet as the standard, and polishing the surface until no hole exists and no bubble exists;
(4) Adding the rest amount of water at room temperature into bauxite with the granularity of 1-3mm, uniformly mixing, paving the bauxite on the surface of the product obtained in the step (3), modeling an end cover, and naturally placing for more than 48 hours to enter a kiln for baking;
(5) And (5) obtaining the molded roller end cover after baking, and carrying out process index detection.
The end cover is used for casting a centrifugal large bar roller, the refractory material can be used at the high temperature of 1800 ℃, the surface of the material is not damaged, the high-temperature strength and the thermal shock resistance are excellent, the use frequency reaches more than 2000 times, the surface of the material is basically unchanged, the contact surface with the end cover is good, the falling-off phenomenon is avoided, the molding sand of the end cover is not damaged in the use process, the overflow phenomenon of molten metal is avoided, and slag inclusion is not generated in a roller composite area.
Claims (3)
1. A manufacturing method of a centrifugal large-sized bar roll end cover is characterized by comprising the following steps:
(1) Firstly, adding 30-40% of total water and 55-60 ℃ water into bauxite with the granularity of 3-8mm to prepare slurry, then uniformly paving the slurry on the surface of a roller end cover, and checking the surface flatness to ensure that the unevenness is less than or equal to 5 mm;
(2) Fully mixing zircon powder, silicon dioxide powder and high-alumina cement, adding water with the total water content of 25-35% and the temperature of 55-60 ℃ into the mixture, fully wetting and uniformly stirring the mixture, then paving the mixture on the surface of the slurry obtained in the step (1), and checking the surface flatness to ensure that the unevenness is less than or equal to 5 mm;
(3) Uniformly jolting the surface of the product obtained in the step (2), leveling the surface by using a ruler with the surface slurry outlet as the standard, and polishing the surface until no hole exists and no bubble exists;
(4) Adding the rest amount of water at room temperature into bauxite with the granularity of 1-3mm, uniformly mixing, paving the bauxite on the surface of the product obtained in the step (3), modeling an end cover, and naturally placing for more than 48 hours to enter a kiln for baking;
(5) Baking to obtain a molded roller end cover, and detecting process indexes;
The end cover comprises a refractory material, wherein the refractory material comprises the following components in percentage by mass: 25-35% of bauxite, 8-10% of zircon powder, 12-15% of high-alumina cement, 35-45% of silicon dioxide powder and 5-10% of water; the bauxite comprises the following components in percentage by weight: bauxite with the granularity of 3-8mm accounts for 10-15%, and bauxite with the granularity of 1-3mm accounts for 15-25%.
2. The production method according to claim 1, wherein the zircon powder in the step (2) has a particle size of 100 to 150 mesh.
3. The production method according to claim 2, wherein the particle size of the silica powder in the step (2) is 10 to 15 μm.
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101475390A (en) * | 2009-01-16 | 2009-07-08 | 张命荣 | Al2O3/ZrO2 refractory casting material and using method thereof |
| CN103880452A (en) * | 2014-03-31 | 2014-06-25 | 沈阳金安铸造材料有限公司 | Unshaped refractory material |
| CN105110801A (en) * | 2015-07-20 | 2015-12-02 | 山东乐江建筑新材料有限公司 | Foamed lightweight refractory castable and preparation method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101475390A (en) * | 2009-01-16 | 2009-07-08 | 张命荣 | Al2O3/ZrO2 refractory casting material and using method thereof |
| CN103880452A (en) * | 2014-03-31 | 2014-06-25 | 沈阳金安铸造材料有限公司 | Unshaped refractory material |
| CN105110801A (en) * | 2015-07-20 | 2015-12-02 | 山东乐江建筑新材料有限公司 | Foamed lightweight refractory castable and preparation method thereof |
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