CN109400124B - Corundum breathable material and preparation method thereof - Google Patents
Corundum breathable material and preparation method thereof Download PDFInfo
- Publication number
- CN109400124B CN109400124B CN201811267698.8A CN201811267698A CN109400124B CN 109400124 B CN109400124 B CN 109400124B CN 201811267698 A CN201811267698 A CN 201811267698A CN 109400124 B CN109400124 B CN 109400124B
- Authority
- CN
- China
- Prior art keywords
- corundum
- hours
- less
- granularity
- breathable material
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Classifications
-
- 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
- C04B35/01—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
- C04B35/10—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 aluminium oxide
- C04B35/101—Refractories from grain sized mixtures
-
- 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
- C04B35/622—Forming processes; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
-
- 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
- C04B38/00—Porous mortars, concrete, artificial stone or ceramic ware; Preparation thereof
- C04B38/10—Porous mortars, concrete, artificial stone or ceramic ware; Preparation thereof by using foaming agents or by using mechanical means, e.g. adding preformed foam
-
- 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
- C04B2235/3205—Alkaline earth oxides or oxide forming salts thereof, e.g. beryllium oxide
- C04B2235/3208—Calcium oxide or oxide-forming salts thereof, e.g. lime
-
- 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
- C04B2235/3222—Aluminates other than alumino-silicates, e.g. spinel (MgAl2O4)
-
- 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
- C04B2235/3232—Titanium oxides or titanates, e.g. rutile or anatase
-
- 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
- C04B2235/44—Metal salt constituents or additives chosen for the nature of the anions, e.g. hydrides or acetylacetonate
- C04B2235/444—Halide containing anions, e.g. bromide, iodate, chlorite
- C04B2235/445—Fluoride containing anions, e.g. fluosilicate
-
- 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
- C04B2235/50—Constituents or additives of the starting mixture chosen for their shape or used because of their shape or their physical appearance
- C04B2235/54—Particle size related information
- C04B2235/5418—Particle size related information expressed by the size of the particles or aggregates thereof
- C04B2235/5427—Particle size related information expressed by the size of the particles or aggregates thereof millimeter or submillimeter sized, i.e. larger than 0,1 mm
-
- 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
- C04B2235/50—Constituents or additives of the starting mixture chosen for their shape or used because of their shape or their physical appearance
- C04B2235/54—Particle size related information
- C04B2235/5418—Particle size related information expressed by the size of the particles or aggregates thereof
- C04B2235/5436—Particle size related information expressed by the size of the particles or aggregates thereof micrometer sized, i.e. from 1 to 100 micron
-
- 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
- C04B2235/70—Aspects relating to sintered or melt-casted ceramic products
- C04B2235/74—Physical characteristics
- C04B2235/77—Density
-
- 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
- C04B2235/70—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
Abstract
The invention relates to a corundum breathable material and a preparation method thereof. The technical scheme is as follows: mixing fine corundum powder and alpha-Al2O3Mixing the micro powder, aluminum hydroxide, aluminum fluoride, an additive, a foaming agent, a foam stabilizer, a water reducing agent and calcium aluminate cement, adding water, stirring, casting and molding, curing, drying, carrying out heat treatment at 1500-1700 ℃ for 5-7 hours, crushing, and screening to obtain a granular material A with the granularity of less than 0.25mm and a granular material B with the granularity of 0.25-1 mm. Then adding alpha-Al2O3Mixing the micro powder, aluminum fluoride, a thickening agent and water, and stirring to obtain slurry. And then mixing the corundum particles, the particle material A, the particle material B, the water reducing agent, the calcium aluminate cement and the slurry, casting, molding, curing, drying, and carrying out heat treatment at 1400-1600 ℃ for 5-7 hours to obtain the corundum breathable material. The invention has low production cost, and the prepared corundum breathable material has the characteristics of high-temperature rupture strength, stable air permeability, excellent anti-scouring performance and long service life.
Description
Technical Field
The invention belongs to the technical field of breathable materials. In particular to a corundum breathable material and a preparation method thereof.
Background
The external refining technology is an important refining process part in the steelmaking process, and can adjust the steel components and the temperature of molten steel. The air brick is an important functional element which can be smoothly implemented by the process, and plays an important role in the reliability and completeness of external refining. The corresponding air-permeable material comprises clay, corundum, spinel and the like, and the types of the air-permeable material mainly comprise dispersion type, straight through hole type, slit type and the like. In the actual use process, the breathable material mainly has the problems of unstable breathable performance, poor corrosion resistance, low high-temperature strength and the like. The problems affect the normal rhythm of the steel smelting process and reduce the working efficiency.
In the existing preparation technology of the breathable material, although sintering of the breathable material can be promoted and bonding strength can be improved by introducing an additive form, the formed low-melting-point liquid phase reduces the mechanical strength of the breathable material; the introduction of the micro powder can enhance the densification of the texture structure and improve the erosion resistance, but the air permeability of the product is affected, and the stability of the structure and the performance of the product is reduced due to uneven distribution of the micro powder.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provides a preparation method of a corundum breathable material with low production cost.
In order to achieve the purpose, the technical scheme adopted by the invention comprises the following specific steps:
firstly, 40-60 wt% of corundum fine powder and 10-20 wt% of alpha-Al2O3Mixing micro powder, 10-20 wt% of aluminum hydroxide, 1-10 wt% of aluminum fluoride, 1-5 wt% of additive, 1-5 wt% of foaming agent, 1-5 wt% of foam stabilizer, 0.1-1 wt% of water reducing agent and 1-5 wt% of calcium aluminate cement to obtain a mixture; and adding water accounting for 10-20 wt% of the mixture, uniformly stirring, casting, and curing for 10-20 hours to obtain a cured blank.
Secondly, drying the solidified blank at the temperature of 90-120 ℃ for 12-24 hours, and then carrying out heat treatment at the temperature of 1500-1700 ℃ for 5-7 hours to obtain a pre-sintered material; and then crushing and screening the pre-sintered material to obtain a granular material A with the granularity of less than 0.25mm and a granular material B with the granularity of 0.25-1 mm.
Thirdly, 20-40 wt% of the alpha-Al2O3Mixing the micro powder, 1-10 wt% of the aluminum fluoride, 1-10 wt% of the thickening agent and 50-70 wt% of water, and uniformly stirring to obtain slurry.
And fourthly, mixing 60-80 wt% of corundum particles, 1-10 wt% of particle materials A, 10-20 wt% of particle materials B, 0.1-1 wt% of water reducing agent, 1-5 wt% of calcium aluminate cement and 1-10 wt% of the slurry, uniformly stirring, casting, curing for 10-20 hours, drying at 90-120 ℃ for 12-24 hours, and performing heat treatment at 1400-1600 ℃ for 5-7 hours to obtain the corundum breathable material.
The corundum fine powder is plate-shaped corundum fine powder or white corundum fine powder, and Al of the corundum fine powder2O3The content is more than 99 wt%; the granularity of the corundum fine powder is less than 0.088 mm.
The corundum particlesIs plate-shaped corundum particles or white corundum particles, and Al of the corundum particles2O3The content is more than 99 wt%; the particle size of the corundum particles is 1-3 mm.
The alpha-Al2O3Micronized Al2O3The content is more than 99 wt%; the alpha-Al2O3The granularity of the micro powder is less than 0.01 mm.
Al (OH) of the aluminum hydroxide3The content is more than 99 wt%; the granularity of the aluminum hydroxide is less than 0.045 mm.
AlF of said aluminum fluoride3Is greater than 99 wt%; the particle size of the aluminum fluoride is less than 0.045 mm.
The additive is zinc oxide or titanium dioxide, and the purity of the additive is more than 99 wt%; the particle size of the additive is less than 0.088 mm.
The foaming agent is sodium dodecyl benzene sulfonate or sodium dodecyl sulfate; the purity of the foaming agent is more than 98 wt%.
The foam stabilizer is fatty alcohol-polyoxyethylene ether sodium sulfate or sodium carboxymethylcellulose.
The water reducing agent is sodium hexametaphosphate or sodium tripolyphosphate; the purity of the water reducing agent is more than 98 wt%.
The calcium aluminate cement: al (Al)2O3Is greater than 65 wt%; SiO 22Less than 0.5 wt%; fe2O3Is less than 0.3 wt%.
The thickening agent is polyvinylpyrrolidone or sodium alginate.
Due to the adoption of the technical scheme, compared with the prior art, the invention has the following positive effects:
(1) the invention utilizes corundum fine powder, aluminum hydroxide and alpha-Al2O3The prepared corundum breathable material is a fine-grain structure granular material taking corundum as a main material, and has the characteristics of multistage through hole structure and high strength. The invention adopts the prefabricated slurry, and can ensure that the micro powder in the prefabricated slurry is uniformly distributed in the corundum particles, the prefabricated particle material A and the prefabricated particle materialAnd B, fine grain combination is formed, and the tissue structure is adjusted. Therefore, the prepared corundum breathable material has higher normal-temperature rupture strength.
(2) The invention controls the high-temperature reaction process among the raw materials with different characteristics, avoids the introduction of impurity phases, and can form a stable fine grain mosaic structure among the prefabricated granule A, the prefabricated granule B and the corundum granules, so that the prepared corundum breathable material has higher high-temperature rupture strength.
(3) According to the invention, through hole structures with different sizes are formed among the prefabricated granular material A, the prefabricated granular material B and the corundum granules by utilizing the composite action of the additive, the foaming agent, the thickening agent and the like at different stages and the particle size difference among different raw materials, so that the stable air permeability of the corundum breathable material is endowed while the mechanical strength of the corundum breathable material is ensured to be higher under different temperature conditions.
(4) According to the structure and performance characteristics of the corundum breathable material, the preparation process is controlled step by step, the growth and occurrence states of crystal grains are adjusted, the formation and communication states of pores are controlled, and the structure and performance of the corundum breathable material are ingeniously controlled.
The invention has the advantages of wide source of raw materials, simple production process and low production cost of the prepared product.
The performance of the corundum breathable material prepared by the invention is detected as follows: the bulk density is 2.5-2.9 g/cm3(ii) a The apparent porosity is 23-31%; the normal temperature rupture strength is more than 7 MPa; the high-temperature (1400 ℃) rupture strength is more than 7 MPa. Therefore, the invention has low production cost, and the prepared corundum breathable material has the characteristics of high-temperature rupture strength, stable breathability, excellent anti-scouring performance and long service life.
Detailed Description
The invention is further described with reference to specific embodiments, without limiting its scope.
In order to avoid repetition, the particle sizes of the materials related to the present embodiment are uniformly described as follows, and are not described in detail in the embodiments:
al of the corundum fine powder2O3The content is more than 99 wt%; the granularity of the corundum fine powder is less than 0.088 mm.
Al of the corundum particles2O3The content is more than 99 wt%; the particle size of the corundum particles is 1-3 mm.
The alpha-Al2O3Micronized Al2O3The content is more than 99 wt%; the alpha-Al2O3The granularity of the micro powder is less than 0.01 mm.
Al (OH) of the aluminum hydroxide3The content is more than 99 wt%; the granularity of the aluminum hydroxide is less than 0.045 mm.
AlF of said aluminum fluoride3Is greater than 99 wt%; the particle size of the aluminum fluoride is less than 0.045 mm.
The purity of the additive is more than 99 wt%; the particle size of the additive is less than 0.088 mm.
The purity of the foaming agent is more than 98 wt%.
The purity of the water reducing agent is more than 98 wt%.
The calcium aluminate cement: al (Al)2O3Is greater than 65 wt%; SiO 22Less than 0.5 wt%; fe2O3Is less than 0.3 wt%.
Example 1
A corundum air-permeable material and its preparation method are provided. The preparation method in this example is:
firstly, 40-50 wt% of corundum fine powder and 10-15 wt% of alpha-Al2O3Mixing micro powder, 15-20 wt% of aluminum hydroxide, 5-10 wt% of aluminum fluoride, 1-5 wt% of additive, 1-5 wt% of foaming agent, 1-5 wt% of foam stabilizer, 0.1-1 wt% of water reducing agent and 1-5 wt% of calcium aluminate cement to obtain a mixture; and adding 15-20 wt% of water into the mixture, uniformly stirring, casting, and curing for 10-15 hours to obtain a cured blank.
Secondly, drying the solidified blank at 100-120 ℃ for 12-16 hours, and then carrying out heat treatment at 1500-1600 ℃ for 5-7 hours to obtain a pre-sintered material; and then crushing and screening the pre-sintered material to obtain a granular material A with the granularity of less than 0.25mm and a granular material B with the granularity of 0.25-1 mm.
Thirdly, 20-30 wt% of the alpha-Al2O3And mixing the micro powder, 5-10 wt% of the aluminum fluoride, 1-5 wt% of the thickening agent and 60-70 wt% of water, and uniformly stirring to obtain slurry.
And fourthly, mixing 60-70 wt% of corundum particles, 5-10 wt% of particle materials A, 10-20 wt% of particle materials B, 0.1-1 wt% of water reducing agent, 1-5 wt% of calcium aluminate cement and 1-5 wt% of the slurry, uniformly stirring, casting, curing for 15-20 hours, drying at 90-120 ℃ for 12-16 hours, and performing heat treatment at 1450-1550 ℃ for 5-7 hours to obtain the corundum breathable material.
In this embodiment:
the corundum fine powder is plate-shaped corundum fine powder;
the corundum particles are plate-shaped corundum particles;
the additive is titanium dioxide;
the foaming agent is sodium dodecyl benzene sulfonate;
the foam stabilizer is fatty alcohol-polyoxyethylene ether sodium sulfate;
the water reducing agent is sodium hexametaphosphate;
the thickening agent is sodium alginate.
The performance of the corundum breathable material prepared in the embodiment is detected as follows: the bulk density is 2.5-2.8 g/cm3(ii) a The apparent porosity is 23-30%; the normal temperature rupture strength is more than 7 MPa; the high-temperature (1400 ℃) rupture strength is more than 7 MPa.
Example 2
A corundum air-permeable material and its preparation method are provided. The preparation method in this example is:
firstly, 50-60 wt% of corundum fine powder and 15-20 wt% of alpha-Al2O3Micro powder, 10-15 wt% of aluminum hydroxide, 5-10 wt% of aluminum fluoride, 1-5 wt% of additive, 1-5 wt% of foaming agent, 1-5 wt% of foam stabilizer, 0.1-1 wt% of water reducing agent and 1 ℃ -5 wt% of calcium aluminate cement is mixed to obtain a mixture; and adding water accounting for 10-15 wt% of the mixture, uniformly stirring, casting, and curing for 10-15 hours to obtain a cured blank.
Secondly, drying the solidified blank at 90-110 ℃ for 19-24 hours, and then carrying out heat treatment at 1550-1650 ℃ for 5-7 hours to obtain a pre-sintered material; and crushing and screening the pre-sintered material to obtain a granular material A with the granularity of less than 0.25mm and a granular material B with the granularity of 0.25-1 mm.
Thirdly, 30-40 wt% of the alpha-Al2O3Mixing the micro powder, 1-5 wt% of the aluminum fluoride, 5-10 wt% of the thickening agent and 50-60 wt% of water, and uniformly stirring to obtain slurry.
And fourthly, mixing 70-80 wt% of corundum particles, 1-5 wt% of particle materials A, 10-20 wt% of particle materials B, 0.1-1 wt% of water reducing agent, 1-5 wt% of calcium aluminate cement and 5-10 wt% of the slurry, uniformly stirring, casting, curing for 10-15 hours, drying for 15-18 hours at 90-120 ℃, and then performing heat treatment for 5-7 hours at 1500-1600 ℃ to obtain the corundum breathable material.
In this embodiment:
the corundum fine powder is plate-shaped corundum fine powder;
the corundum particles are plate-shaped corundum particles;
the additive is titanium dioxide;
the foaming agent is sodium dodecyl benzene sulfonate;
the foam stabilizer is sodium carboxymethyl cellulose;
the water reducing agent is sodium tripolyphosphate;
the thickening agent is polyvinylpyrrolidone.
The performance of the corundum breathable material prepared in the embodiment is detected as follows: the bulk density is 2.6-2.9 g/cm3(ii) a The apparent porosity is 25-31%; the normal temperature rupture strength is more than 8 MPa; the high-temperature (1400 ℃) rupture strength is more than 7 MPa.
Example 3
A corundum air-permeable material and its preparation method are provided. The preparation method in this example is:
firstly, 50-60 wt% of corundum fine powder and 10-15 wt% of alpha-Al2O3Mixing micro powder, 10-15 wt% of aluminum hydroxide, 1-5 wt% of aluminum fluoride, 1-5 wt% of additive, 1-5 wt% of foaming agent, 1-5 wt% of foam stabilizer, 0.1-1 wt% of water reducing agent and 1-5 wt% of calcium aluminate cement to obtain a mixture; and adding 15-20 wt% of water into the mixture, uniformly stirring, casting and molding, and curing for 15-20 hours to obtain a cured blank.
Secondly, drying the solidified blank at 100-120 ℃ for 15-18 hours, and then carrying out heat treatment at 1600-1700 ℃ for 5-7 hours to obtain a pre-sintered material; and then crushing and screening the pre-sintered material to obtain a granular material A with the granularity of less than 0.25mm and a granular material B with the granularity of 0.25-1 mm.
Thirdly, 20-30 wt% of the alpha-Al2O3And mixing the micro powder, 5-10 wt% of the aluminum fluoride, 1-5 wt% of the thickening agent and 60-70 wt% of water, and uniformly stirring to obtain slurry.
And fourthly, mixing 60-70 wt% of corundum particles, 1-5 wt% of particle materials A, 10-20 wt% of particle materials B, 0.1-1 wt% of water reducing agent, 1-5 wt% of calcium aluminate cement and 5-10 wt% of the slurry, uniformly stirring, casting, curing for 15-20 hours, drying for 17-24 hours at 90-120 ℃, and then performing heat treatment for 5-7 hours at 1400-1500 ℃ to obtain the corundum breathable material.
In this embodiment:
the corundum fine powder is white corundum fine powder;
the corundum particles are white corundum particles;
the additive is zinc oxide;
the foaming agent is sodium dodecyl sulfate;
the foam stabilizer is sodium carboxymethyl cellulose;
the water reducing agent is sodium tripolyphosphate;
the thickening agent is polyvinylpyrrolidone.
The performance of the corundum breathable material prepared in the embodiment is detected as follows: the bulk density is 2.6-2.9 g/cm3(ii) a The apparent porosity is 25-30%; the normal temperature rupture strength is more than 8 MPa; the high-temperature (1400 ℃) rupture strength is more than 8 MPa.
Example 4
A corundum air-permeable material and its preparation method are provided. The preparation method in this example is:
firstly, 40-50 wt% of corundum fine powder and 15-20 wt% of alpha-Al2O3Mixing micro powder, 15-20 wt% of aluminum hydroxide, 5-10 wt% of aluminum fluoride, 1-5 wt% of additive, 1-5 wt% of foaming agent, 1-5 wt% of foam stabilizer, 0.1-1 wt% of water reducing agent and 1-5 wt% of calcium aluminate cement to obtain a mixture; and adding water accounting for 10-15 wt% of the mixture, uniformly stirring, casting, and curing for 10-15 hours to obtain a cured blank.
Secondly, drying the solidified blank at the temperature of 90-110 ℃ for 17-20 hours, and then carrying out heat treatment at the temperature of 1550-1650 ℃ for 5-7 hours to obtain a pre-sintered material; and then crushing and screening the pre-sintered material to obtain a granular material A with the granularity of less than 0.25mm and a granular material B with the granularity of 0.25-1 mm.
Thirdly, 30-40 wt% of the alpha-Al2O3Mixing the micro powder, 1-5 wt% of the aluminum fluoride, 5-10 wt% of the thickening agent and 50-60 wt% of water, and uniformly stirring to obtain slurry.
And fourthly, mixing 70-80 wt% of corundum particles, 1-5 wt% of particle materials A, 10-20 wt% of particle materials B, 0.1-1 wt% of water reducing agent, 1-5 wt% of calcium aluminate cement and 1-5 wt% of the slurry, uniformly stirring, casting, curing for 10-15 hours, drying for 15-18 hours at 90-120 ℃, and then performing heat treatment for 5-7 hours at 1400-1500 ℃ to obtain the corundum breathable material.
In this embodiment:
the corundum fine powder is white corundum fine powder;
the corundum particles are white corundum particles;
the additive is zinc oxide;
the foaming agent is sodium dodecyl benzene sulfonate;
the foam stabilizer is fatty alcohol-polyoxyethylene ether sodium sulfate;
the water reducing agent is sodium hexametaphosphate;
the thickening agent is polyvinylpyrrolidone.
The performance of the corundum breathable material prepared in the embodiment is detected as follows: the bulk density is 2.6-2.9 g/cm3(ii) a The apparent porosity is 23-29%; the normal temperature rupture strength is more than 7 MPa; the high-temperature (1400 ℃) rupture strength is more than 9 MPa.
Compared with the prior art, the specific implementation mode has the following positive effects:
(1) the present embodiment utilizes corundum fine powder, aluminum hydroxide and alpha-Al2O3The prepared corundum breathable material is a fine-grain structure granular material taking corundum as a main material, and has the characteristics of multistage through hole structure and high strength. The embodiment adopts the prefabricated slurry, so that the micro powder in the prefabricated slurry can be uniformly distributed among the corundum particles, the prefabricated particle material A and the prefabricated particle material B, fine grain combination is formed, and the tissue structure is also adjusted. Therefore, the prepared corundum breathable material has higher normal-temperature rupture strength.
(2) According to the specific embodiment, the high-temperature reaction process among the raw materials with different characteristics is controlled, so that the introduction of an impurity phase is avoided, and a stable fine-grain mosaic structure can be formed among the prefabricated granular material A, the prefabricated granular material B and the corundum particles, so that the prepared corundum breathable material has high-temperature rupture strength.
(3) According to the embodiment, through hole structures with different sizes are formed among the prefabricated granular material A, the prefabricated granular material B and the corundum granules by utilizing the composite action of the additive, the foaming agent, the thickening agent and the like at different stages and the particle size difference among different raw materials, so that the stable air permeability of the corundum air permeable material is endowed while the mechanical strength of the corundum air permeable material is high under different temperature conditions.
(4) According to the structure and performance characteristics of the corundum breathable material, the preparation process is controlled step by step, the growth and occurrence states of crystal grains are adjusted, the formation and communication states of pores are controlled, and the structure and performance of the corundum breathable material are ingeniously controlled.
The specific implementation mode has the advantages of wide source of the adopted raw materials, simple production process and low production cost of the prepared product.
The performance of the corundum breathable material prepared by the specific embodiment is detected as follows: the bulk density is 2.5-2.9 g/cm3(ii) a The apparent porosity is 23-31%; the normal temperature rupture strength is more than 7 MPa; the high-temperature (1400 ℃) rupture strength is more than 7 MPa.
Therefore, the production cost of the embodiment is low, and the prepared corundum breathable material has the characteristics of high-temperature rupture strength, stable air permeability, excellent anti-scouring performance and long service life.
Claims (11)
1. A preparation method of a corundum breathable material is characterized by comprising the following steps:
firstly, 40-60 wt% of corundum fine powder and 10-20 wt% of alpha-Al2O3Mixing micro powder, 10-20 wt% of aluminum hydroxide, 1-10 wt% of aluminum fluoride, 1-5 wt% of additive, 1-5 wt% of foaming agent, 1-5 wt% of foam stabilizer, 0.1-1 wt% of water reducing agent and 1-5 wt% of calcium aluminate cement to obtain a mixture; adding water accounting for 10-20 wt% of the mixture, uniformly stirring, casting, and curing for 10-20 hours to obtain a cured blank;
secondly, drying the solidified blank at the temperature of 90-120 ℃ for 12-24 hours, and then carrying out heat treatment at the temperature of 1500-1700 ℃ for 5-7 hours to obtain a pre-sintered material; then crushing and screening the pre-sintered material to obtain a granular material A with the granularity of less than 0.25mm and a granular material B with the granularity of 0.25-1 mm;
thirdly, 20-40 wt% of the alpha-Al2O3Micro powder, 1-10 wt% of aluminum fluoride, 1-10 wt% of thickening agent and 5Mixing 0-70 wt% of water, and uniformly stirring to obtain slurry;
fourthly, mixing 60-80 wt% of corundum particles, 1-10 wt% of particle materials A, 10-20 wt% of particle materials B, 0.1-1 wt% of water reducing agent, 1-5 wt% of calcium aluminate cement and 1-10 wt% of slurry, uniformly stirring, casting, curing for 10-20 hours, drying at 90-120 ℃ for 12-24 hours, and then performing heat treatment at 1400-1600 ℃ for 5-7 hours to obtain the corundum breathable material;
the corundum fine powder is plate-shaped corundum fine powder or white corundum fine powder, and Al of the corundum fine powder2O3The content is more than 99 wt%; the granularity of the corundum fine powder is less than 0.088 mm;
the corundum particles are plate-shaped corundum particles or white corundum particles, and Al of the corundum particles2O3The content is more than 99 wt%; the particle size of the corundum particles is 1-3 mm.
2. The method of claim 1, wherein the alpha-Al is selected from the group consisting of Al, and combinations thereof2O3Micronized Al2O3The content is more than 99 wt%; the alpha-Al2O3The granularity of the micro powder is less than 0.01 mm.
3. The method for preparing a corundum based breathable material according to claim 1, wherein said aluminum hydroxide is Al (OH)3The content is more than 99 wt%; the granularity of the aluminum hydroxide is less than 0.045 mm.
4. The method of claim 1, wherein said AlF of aluminum fluoride is3Is greater than 99 wt%; the particle size of the aluminum fluoride is less than 0.045 mm.
5. The method of claim 1, wherein the additive is zinc oxide or titanium dioxide, and the purity of the additive is greater than 99 wt%; the particle size of the additive is less than 0.088 mm.
6. The method of claim 1, wherein the foaming agent is sodium dodecylbenzenesulfonate or sodium dodecylsulfate, and the purity of the foaming agent is greater than 98 wt%.
7. The method for preparing a corundum breathable material according to claim 1, wherein the foam stabilizer is sodium fatty alcohol-polyoxyethylene ether sulfate or sodium carboxymethylcellulose.
8. The method for preparing a corundum breathable material according to claim 1, wherein the water reducing agent is sodium hexametaphosphate or sodium tripolyphosphate, and the purity of the water reducing agent is more than 98 wt%.
9. The method for preparing a corundum-based gas permeable material according to claim 1, wherein the calcium aluminate cement: al (Al)2O3Is greater than 65 wt%; SiO 22Less than 0.5 wt%; fe2O3Is less than 0.3 wt%.
10. The method of claim 1, wherein the thickening agent is polyvinylpyrrolidone or sodium alginate.
11. A corundum air-permeable material, characterized in that the corundum air-permeable material is prepared by the method for preparing a corundum air-permeable material according to any one of claims 1 to 10.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811267698.8A CN109400124B (en) | 2018-10-29 | 2018-10-29 | Corundum breathable material and preparation method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811267698.8A CN109400124B (en) | 2018-10-29 | 2018-10-29 | Corundum breathable material and preparation method thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109400124A CN109400124A (en) | 2019-03-01 |
| CN109400124B true CN109400124B (en) | 2022-01-04 |
Family
ID=65469611
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811267698.8A Active CN109400124B (en) | 2018-10-29 | 2018-10-29 | Corundum breathable material and preparation method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN109400124B (en) |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102659426A (en) * | 2012-04-20 | 2012-09-12 | 武汉科技大学 | Micro-porous high-strength anti-corrosion corundum refractory aggregate and preparation method thereof |
| CN103242051A (en) * | 2013-05-30 | 2013-08-14 | 武汉科技大学 | Lightweight corundum-mullite castable and preparation method thereof |
| CN105859309A (en) * | 2016-03-31 | 2016-08-17 | 武汉科技大学 | Dispersive air brick and preparation method thereof |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101381241B (en) * | 2008-10-16 | 2011-06-15 | 武汉科技大学 | Porous breathable refractory materials for upper nozzle and production method thereof |
| CN105645979B (en) * | 2016-01-15 | 2018-04-27 | 浙江自立高温科技有限公司 | A kind of air brick of steel ladle and preparation method thereof |
-
2018
- 2018-10-29 CN CN201811267698.8A patent/CN109400124B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102659426A (en) * | 2012-04-20 | 2012-09-12 | 武汉科技大学 | Micro-porous high-strength anti-corrosion corundum refractory aggregate and preparation method thereof |
| CN103242051A (en) * | 2013-05-30 | 2013-08-14 | 武汉科技大学 | Lightweight corundum-mullite castable and preparation method thereof |
| CN105859309A (en) * | 2016-03-31 | 2016-08-17 | 武汉科技大学 | Dispersive air brick and preparation method thereof |
Also Published As
| Publication number | Publication date |
|---|---|
| CN109400124A (en) | 2019-03-01 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN105254323B (en) | A kind of micropore corundum-mullite ceramics separation-membrane support and preparation method thereof | |
| CN101381241B (en) | Porous breathable refractory materials for upper nozzle and production method thereof | |
| CN110845245B (en) | Compact high-purity zirconia refractory product | |
| WO2018126937A1 (en) | Dispersion-type corundum-spinel air-permeable brick and preparation method therefor | |
| CN107382357A (en) | A kind of ladle bottom blowing composite air bricks disperse material and preparation method thereof | |
| CN107805059A (en) | A kind of Ladle Bottom brick cup and preparation method thereof | |
| CN110078484B (en) | Corundum-mullite crucible and preparation method thereof | |
| CN105110800A (en) | Wet spraying coating for blast furnace shaft bottom inner liner, application thereof, and restoration method of blast furnace shaft bottom inner liner | |
| CN110937920A (en) | Ultralight high-strength anorthite porous ceramic and preparation method thereof | |
| CN109133987B (en) | Corundum-spinel breathable material and preparation method thereof | |
| CN104926291A (en) | Preparation method of special grinding body for dry powder grinding mill | |
| CN109400188B (en) | Anti-seepage castable for aluminum melting furnace and preparation method | |
| CN109279906B (en) | Magnesium castable and preparation method thereof | |
| CN110040995B (en) | Preparation method of high-temperature light tough mullite aggregate | |
| CN109320280B (en) | Air-permeable material for converter and preparation method thereof | |
| CN107032770A (en) | Diffusion-type skeleton enhancing corundum spinelle air brick and preparation method thereof | |
| CN109400124B (en) | Corundum breathable material and preparation method thereof | |
| CN109180160B (en) | Magnesium breathable material for tundish and preparation method thereof | |
| CN109336626B (en) | Magnesium castable with forsterite as main raw material and preparation method thereof | |
| CN109400127B (en) | Air-permeable material for ladle and preparation method thereof | |
| CN109553400A (en) | A kind of casting sintering ceramsite and preparation method thereof | |
| CN108706967A (en) | A kind of forsterite brick and its production technology | |
| CN114477976A (en) | Cementing material for steel ladle and preparation method thereof | |
| CN109053176B (en) | Chromium-containing mullite refractory material and preparation method thereof | |
| CN113999028A (en) | Aluminum back seam material for steel ladle and preparation method thereof |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |