CN111825434A - Environment-friendly Al2O3-SiC-Ti3SiC2Castable and preparation method thereof - Google Patents

Environment-friendly Al2O3-SiC-Ti3SiC2Castable and preparation method thereof Download PDF

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CN111825434A
CN111825434A CN202010504607.9A CN202010504607A CN111825434A CN 111825434 A CN111825434 A CN 111825434A CN 202010504607 A CN202010504607 A CN 202010504607A CN 111825434 A CN111825434 A CN 111825434A
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castable
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environment
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金金
魏军魁
许猛
夏扬
程智道
佘丽霞
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Changxing Furnace Material Co ltd
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Changxing Furnace Material Co ltd
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    • C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
    • C04B35/01—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics
    • C04B35/10—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
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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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    • C04B2235/3427—Silicates other than clay, e.g. water glass
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    • C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
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Abstract

The invention relates to environment-friendly Al2O3‑SiC‑Ti3SiC2A castable and a preparation method thereof. The technical scheme is as follows: environment-friendly Al2O3‑SiC‑Ti3SiC2The castable comprises the following raw material components in percentage by weight: 40-60 parts by mass of brown corundum particles, 15-20 parts by mass of silicon carbide particles, 25-35 parts by mass of silicon carbide fine powder or white corundum fine powder, 6-12 parts by mass of alumina micro powder or silica micro powder, and Ti3SiC26-10 parts of powder and 1-3 parts of calcium aluminate cement. Mixing the raw materials, adding polycarboxylate and water to prepare the environment-friendly Al2O3‑SiC‑Ti3SiC2And (5) pouring a material. The invention uses Ti3SiC2Replaces the traditional asphalt, has the characteristics of simple process and environmental protection, and the prepared environment-friendly Al2O3‑SiC‑Ti3SiC2Strong oxidation resistance of castable and molten iron scouring resistanceExcellent slag corrosion resistance/permeability and high iron flux.

Description

Environment-friendly Al2O3-SiC-Ti3SiC2Castable and preparation method thereof
[ technical field ] A method for producing a semiconductor device
The invention belongs to the field of refractory castable for blast furnace tapping channels, and particularly relates to environment-friendly Al2O3-SiC-Ti3SiC2A castable and a preparation method thereof.
[ background of the invention ]
The progress of the steel smelting technology promotes the large-scale development of the blast furnace, and the blast furnace smelting strength is increased continuously, the tapping temperature is gradually increased, and the molten iron flow is also increased obviously. At present, the tapping time of a large-scale blast furnace is prolonged, the tapping times are more frequent, and the flow rate of molten iron is accelerated, so that a tapping runner of the blast furnace faces long-time molten iron scouring and serious slag erosion. Therefore, the severe service environment of the large-scale blast furnace tapping channel puts higher requirements on the high-temperature mechanical property and the slag corrosion resistance of the tapping channel castable.
At present, the working lining of the blast furnace tapping channel is mainly made of Al2O3the-SiC-C castable is mainly made of Al and fully utilizes2O3The high thermal conductivity of silicon carbide and carbon in the-SiC-C castable and the non-wettability with iron slag endow the iron runner material with excellent scouring resistance, erosion resistance and thermal shock resistance. Generally, spherical asphalt is used as Al2O3A carbon source of the-SiC-C castable improves the slag corrosion resistance and the permeability of the iron runner castable. However, as is well known, the spherical asphalt is used as an activated carbon, the high-temperature oxidation temperature is about 700 ℃, asphalt on the surface of the castable is burnt out during the baking process of the iron runner castable, a porous iron runner working lining is remained, and Al is seriously reduced2O3Slag erosion/permeation resistance and molten iron scouring resistance of the-SiC-C castable. On the one hand, the oxidation loss of the spherical asphalt reduces Al2O3The non-wetting performance of the-SiC-C castable on the molten slag aggravates the erosion of the molten slag on the iron runner material; on the other hand, the burning loss of the asphalt damages the integrity of the iron runner material, reduces the surface strength of the castable material and aggravates the penetration of the iron slag into the castable material. Moreover, the burning loss of the asphalt in the baking process can release toxic smoke, which seriously affects the health of constructors and causes environmental pollution.
To solve the problem of Al2O3-SiC-C substanceThe patent technology of an erosion-resistant blast furnace iron runner self-flowing castable and a preparation method thereof (CN108503377A) discloses a castable of a composite antioxidant added with metal aluminum powder and boron carbide. The iron runner castable prepared by the method can improve the high-temperature oxidation resistance of the material through an antioxidant, but has limited oxidation resistance to spherical asphalt on the surface of the castable in the baking process (800 ℃ below zero). Furthermore, the patent technology of 'an iron runner castable containing modified graphite and a preparation method thereof' (CN201410738931.1) discloses a molten salt method for preparing the iron runner castable by modifying graphite and replacing spherical asphalt. The method adopts graphite as a carbon source to solve the problem of toxic gas generated by asphalt loss, but the graphite modification process is complex and is not suitable for industrial production, and the problem of poor oxidation resistance of the carbon source is still not solved by the modified graphite.
[ summary of the invention ]
The invention aims to overcome the defects of the prior art and aims to provide the environment-friendly Al with simple process2O3-SiC-Ti3SiC2Preparation method of castable and environment-friendly Al prepared by method2O3-SiC-Ti3SiC2The castable has strong oxidation resistance, molten iron scouring resistance, excellent slag erosion/permeability resistance and high iron flux.
In order to achieve the purpose, the technical scheme adopted by the invention comprises the following steps:
step one, environment-friendly Al2O3-SiC-Ti3SiC2The castable comprises the following raw material components in percentage by weight: 40-60 parts by mass of brown corundum particles, 15-20 parts by mass of silicon carbide particles, 25-35 parts by mass of silicon carbide fine powder or white corundum fine powder, 6-12 parts by mass of alumina micro powder or silica micro powder, and Ti3SiC26-10 parts of powder and 1-3 parts of calcium aluminate cement;
step two, mixing the raw materials according to the raw material components and the content thereof to obtain a mixture; adding into the mixtureAdding 0.5-1 wt% of polycarboxylate and 4-6 wt% of water, and uniformly stirring for 20-30 min by using a powerful stirrer to obtain the environment-friendly Al2O3-SiC-Ti3SiC2And (5) pouring a material.
Al of the brown corundum particles2O3The content is more than or equal to 93 wt%; the particle size of the brown corundum particles is 3-8 mm.
The SiC content of the silicon carbide particles and the silicon carbide fine powder is more than or equal to 97 wt%; the granularity of the silicon carbide particles is 0-1 mm, and the granularity of the silicon carbide fine powder is less than or equal to 0.088 mm.
Al of the fine white corundum powder and the alumina micropowder2O3The content is more than or equal to 98 wt%; the granularity of the white corundum fine powder is less than or equal to 0.088mm, and the granularity of the alumina micro powder is less than or equal to 2 mu m.
The Ti3SiC2The purity of the powder is more than or equal to 99 wt%, and the granularity is less than or equal to 1 mu m.
Due to the adoption of the technical scheme, compared with the prior art, the invention has the following positive effects:
the invention adopts Ti3SiC2Replace the traditional Al2O3Spherical asphalt in-SiC-C castable to fully exert Ti3SiC2The asphalt has non-wettability and high oxidation resistance to iron slag, and solves the problem that the slag erosion resistance and molten iron scouring resistance of the iron runner castable are obviously reduced due to baking and oxidation of the traditional spherical asphalt. The invention is realized by directly adding Ti3SiC2Introducing into the casting material, and casting to obtain Al2O3-SiC-Ti3SiC2The iron runner material has simple process. As the prepared castable is not added with spherical asphalt, toxic smoke generated by asphalt oxidation of iron runner materials in the baking process and environmental pollution are not involved, the prepared Al2O3-SiC-Ti3SiC2The iron runner material is environment-friendly.
Ti3SiC2Being hexagonal, the crystal structure resembles the layered structure of the formation. This particular crystal structure imparts Ti3SiC2Excellent heat conducting performance, thermal shock resistance, damage tolerance resistance, high temperature oxidation resistance and melting propertyThe slag is not wettable. The invention is to mix Ti3SiC2The introduction into the iron runner castable is an effective way for taking the oxidation resistance, high-temperature slag corrosion resistance and molten iron scouring resistance of the iron runner into consideration. On the one hand, in Al2O3-SiC-Ti3SiC2The low-temperature ladle drying stage (800 ℃) of the castable is performed, and Ti is used3SiC2By means of the self oxidation resistance, the surface loosening phenomenon of the iron runner material caused by oxidation and burning loss of the traditional carbon source can be solved, and the weakening of the slag penetration resistance and the slag corrosion resistance of the iron runner material by the ladle drying process is avoided; on the other hand, Ti is added at the tapping stage (1500 ℃ C.) of the blast furnace3SiC2Can also be used as Al2O3-SiC-Ti3SiC2The high-efficiency antioxidant of the castable can be oxidized before SiC, so that the oxidization of SiC in the castable is thermodynamically hindered, and the molten iron scouring resistance of SiC in the castable is fully exerted. Notably, Ti3SiC2Oxidized in high temperature environment to form liquid TiO on the surface2And SiO2Due to liquid SiO2Has high viscosity, can not only fill pores in the casting material, but also effectively prevent oxygen from further flowing to Ti3SiC2Medium diffusion, kinetically preventing Al2O3-SiC-Ti3SiC2Oxidizing the casting material; further, Ti3SiC2Has high ductility at high temperature, and has a lamellar structure of Al2O3-SiC-Ti3SiC2The castable plays a two-dimensional toughening phase to toughen the castable and obviously improve Al2O3-SiC-Ti3SiC2High-temperature strength and thermal shock resistance of the casting material.
The invention prepares environment-friendly Al2O3-SiC-Ti3SiC2And (3) detecting a sintered sample after the castable is subjected to heat treatment at 1450 ℃ for 3 hours in an air atmosphere: the normal-temperature breaking strength of the sample is 15-26 MPa, the high-temperature breaking strength (1450 ℃ multiplied by 0.5h) is 4-8 MPa, and the water cooling circulation times at 1100 ℃ are 8-12; the Al is2O3-SiC-Ti3SiC2Casting material is processed by the steps of 1The oxidation rate of SiC is 0.1-0.6 wt% after oxidation for 10 hours at 500 ℃; the Al is2O3-SiC-Ti3SiC2The iron feeding amount of the castable is 16-22 ten thousand tons.
Therefore, the invention has the characteristics of simple process and environmental protection, and the prepared environment-friendly Al2O3-SiC-Ti3SiC2The castable has strong oxidation resistance, molten iron scouring resistance, excellent slag erosion/permeability resistance and high iron flux.
The features and advantages of the present invention will be described in detail by way of examples.
[ detailed description ] embodiments
The invention is further described with reference to specific embodiments, without limiting its scope.
Al of the brown corundum particles2O3The content is more than or equal to 93 wt%; the particle size of the brown corundum particles is 3-8 mm.
The SiC content of the silicon carbide particles and the silicon carbide fine powder is more than or equal to 97 wt%; the granularity of the silicon carbide particles is 0-1 mm, and the granularity of the silicon carbide fine powder is less than or equal to 0.088 mm.
Al of the fine white corundum powder and the alumina micropowder2O3The content is more than or equal to 98 wt%; the granularity of the white corundum fine powder is less than or equal to 0.088mm, and the granularity of the alumina micro powder is less than or equal to 2 mu m.
The Ti3SiC2The purity of the powder is more than or equal to 99 wt%, and the granularity is less than or equal to 1 mu m.
Example 1
Environment-friendly Al2O3-SiC-Ti3SiC2A castable and a preparation method thereof. The preparation method of the embodiment comprises the following specific steps:
step one, environment-friendly Al2O3-SiC-Ti3SiC2The castable comprises the following raw material components in percentage by weight: 40-50 parts by mass of brown corundum particles, 18-20 parts by mass of silicon carbide particles, 15-24 parts by mass of silicon carbide fine powder, 8-16 parts by mass of white corundum fine powder, 4-8 parts by mass of alumina micro powder, 2-6 parts by mass of silica micro powder, and Ti3SiC2The powder accounts for 6-8 mass percent1-2.5 parts by mass of calcium aluminate cement;
step two, mixing the raw materials according to the raw material components and the content thereof to obtain a mixture; adding 0.5-0.8 wt% of polycarboxylate and 4-5.5 wt% of water into the mixture, and uniformly stirring for 20-30 min by using a powerful stirrer to obtain the environment-friendly Al2O3-SiC-Ti3SiC2And (5) pouring a material.
Environment-friendly Al prepared in example 12O3-SiC-Ti3SiC2And (3) detecting a sintered sample after the castable is subjected to heat treatment at 1450 ℃ for 3 hours in an air atmosphere: the normal-temperature breaking strength of the sample is 15-20 MPa, the high-temperature breaking strength (1450 ℃ multiplied by 0.5h) is 4-6 MPa, and the water cooling circulation times at 1100 ℃ are 8-10; the Al is2O3-SiC-Ti3SiC2The SiC oxidation rate of the castable is 0.3-0.6 wt% after the castable is oxidized for 10 hours at 1500 ℃ in the air atmosphere; the Al is2O3-SiC-Ti3SiC2The iron feeding amount of the castable is 16-18 ten thousand tons.
Example 2
Environment-friendly Al2O3-SiC-Ti3SiC2A castable and a preparation method thereof. The preparation method of the embodiment comprises the following specific steps:
step one, environment-friendly Al2O3-SiC-Ti3SiC2The castable comprises the following raw material components in percentage by weight: 40-50 parts by mass of brown corundum particles, 15-18 parts by mass of silicon carbide particles, 12-20 parts by mass of silicon carbide fine powder, 10-16 parts by mass of white corundum fine powder, 4-6 parts by mass of alumina micro powder, 2-7 parts by mass of silica micro powder, and Ti3SiC27-10 parts of powder and 2-3 parts of calcium aluminate cement;
step two, mixing the raw materials according to the raw material components and the content thereof to obtain a mixture; adding 0.6-0.9 wt% of polycarboxylate and 4-5 wt% of water into the mixture, and uniformly stirring for 20-30 min by using a powerful stirrer to obtain the environment-friendly Al2O3-SiC-Ti3SiC2And (5) pouring a material.
The true bookExample 2 preparation of Environment-friendly Al2O3-SiC-Ti3SiC2And (3) detecting a sintered sample after the castable is subjected to heat treatment at 1450 ℃ for 3 hours in an air atmosphere: the normal-temperature breaking strength of the sample is 21-25 MPa, the high-temperature breaking strength (1450 ℃ multiplied by 0.5h) is 6-8 MPa, and the water cooling circulation times at 1100 ℃ are 10-12; the Al is2O3-SiC-Ti3SiC2The SiC oxidation rate of the castable is 0.1-0.4 wt% after the castable is oxidized for 10 hours at 1500 ℃ in the air atmosphere; the Al is2O3-SiC-Ti3SiC2The iron feeding amount of the castable is 20-22 ten thousand tons.
Example 3
Environment-friendly Al2O3-SiC-Ti3SiC2A castable and a preparation method thereof. The preparation method of the embodiment comprises the following specific steps:
step one, environment-friendly Al2O3-SiC-Ti3SiC2The castable comprises the following raw material components in percentage by weight: 50-60 parts by mass of brown corundum particles, 15-18 parts by mass of silicon carbide particles, 13-24 parts by mass of silicon carbide fine powder, 9-15 parts by mass of white corundum fine powder, 4-6 parts by mass of alumina micro powder, 2-7 parts by mass of silica micro powder, and Ti3SiC27-10 parts of powder and 1.5-3 parts of calcium aluminate cement;
step two, mixing the raw materials according to the raw material components and the content thereof to obtain a mixture; adding 0.5-0.8 wt% of polycarboxylate and 4.5-6 wt% of water into the mixture, and uniformly stirring for 20-30 min by using a powerful stirrer to obtain the environment-friendly Al2O3-SiC-Ti3SiC2And (5) pouring a material.
The environment-friendly Al prepared in this example 32O3-SiC-Ti3SiC2And (3) detecting a sintered sample after the castable is subjected to heat treatment at 1450 ℃ for 3 hours in an air atmosphere: the normal-temperature breaking strength of the sample is 23-26 MPa, the high-temperature breaking strength (1450 ℃ multiplied by 0.5h) is 6-7.6 MPa, and the water cooling circulation times at 1100 ℃ are 9-12; the Al is2O3-SiC-Ti3SiC2The casting material is processed by 150 g in air atmosphereThe oxidation rate of SiC is 0.2 to 0.5 weight percent after the SiC is oxidized for 10 hours at the temperature of 0 ℃; the Al is2O3-SiC-Ti3SiC2The iron feeding amount of the castable is 19-20 ten thousand tons.
Example 4
Environment-friendly Al2O3-SiC-Ti3SiC2A castable and a preparation method thereof. The preparation method of the embodiment comprises the following specific steps:
step one, environment-friendly Al2O3-SiC-Ti3SiC2The castable comprises the following raw material components in percentage by weight: 50-60 parts by mass of brown corundum particles, 18-20 parts by mass of silicon carbide particles, 11-20 parts by mass of silicon carbide fine powder, 10-16 parts by mass of white corundum fine powder, 4-8 parts by mass of alumina micro powder, 2-6 parts by mass of silica micro powder, and Ti3SiC26-8 parts of powder and 1.5-2 parts of calcium aluminate cement;
step two, mixing the raw materials according to the raw material components and the content thereof to obtain a mixture; adding 0.5-0.8 wt% of polycarboxylate and 4-5.5 wt% of water into the mixture, and uniformly stirring for 20-30 min by using a powerful stirrer to obtain the environment-friendly Al2O3-SiC-Ti3SiC2And (5) pouring a material.
The environment-friendly Al prepared in this example 42O3-SiC-Ti3SiC2And (3) detecting a sintered sample after the castable is subjected to heat treatment at 1450 ℃ for 3 hours in an air atmosphere: the normal-temperature breaking strength of the sample is 16-19 MPa, the high-temperature breaking strength (1450 ℃ multiplied by 0.5h) is 4.3-5.6 MPa, and the water cooling cycle times at 1100 ℃ are 8-9; the Al is2O3-SiC-Ti3SiC2The SiC oxidation rate of the castable is 0.3-0.6 wt% after the castable is oxidized for 10 hours at 1500 ℃ in the air atmosphere; the Al is2O3-SiC-Ti3SiC2The iron feeding amount of the castable is 16-19 ten thousand tons.
Example 5
Environment-friendly Al2O3-SiC-Ti3SiC2A castable and a preparation method thereof. The preparation method of the embodiment comprises the following specific steps:
step one, environment-friendly Al2O3-SiC-Ti3SiC2The castable comprises the following raw material components in percentage by weight: 40-50 parts by mass of brown corundum particles, 15-18 parts by mass of silicon carbide particles, 12-20 parts by mass of silicon carbide fine powder, 9-15 parts by mass of white corundum fine powder, 4-6 parts by mass of alumina micro powder, 2-7 parts by mass of silica micro powder, and Ti3SiC26-9 parts of powder and 1-2 parts of calcium aluminate cement;
step two, mixing the raw materials according to the raw material components and the content thereof to obtain a mixture; adding 0.5-0.8 wt% of polycarboxylate and 4-5 wt% of water into the mixture, and uniformly stirring for 20-30 min by using a powerful stirrer to obtain the environment-friendly Al2O3-SiC-Ti3SiC2And (5) pouring a material.
The environment-friendly Al prepared in this example 52O3-SiC-Ti3SiC2And (3) detecting a sintered sample after the castable is subjected to heat treatment at 1450 ℃ for 3 hours in an air atmosphere: the normal-temperature breaking strength of the sample is 18-24 MPa, the high-temperature breaking strength (1450 ℃ multiplied by 0.5h) is 4.2-6.1 MPa, and the water cooling cycle times at 1100 ℃ are 8-10; the Al is2O3-SiC-Ti3SiC2The SiC oxidation rate of the castable is 0.2-0.6 wt% after the castable is oxidized for 10 hours at 1500 ℃ in the air atmosphere; the Al is2O3-SiC-Ti3SiC2The iron feeding amount of the castable is 17-20 ten thousand tons.
Example 6
Environment-friendly Al2O3-SiC-Ti3SiC2A castable and a preparation method thereof. The preparation method of the embodiment comprises the following specific steps:
step one, environment-friendly Al2O3-SiC-Ti3SiC2The castable comprises the following raw material components in percentage by weight: 50-60 parts by mass of brown corundum particles, 18-20 parts by mass of silicon carbide particles, 13-24 parts by mass of silicon carbide fine powder, 8-16 parts by mass of white corundum fine powder, 4-8 parts by mass of alumina micro powder, 2-6 parts by mass of silica micro powder, and Ti3SiC27-10 parts of powder and 1.5-2.5 parts of calcium aluminate cement;
step two, mixing the raw materials according to the raw material components and the content thereof to obtain a mixture; adding 0.5-0.8 wt% of polycarboxylate and 4.5-6 wt% of water into the mixture, and uniformly stirring for 20-30 min by using a powerful stirrer to obtain the environment-friendly Al2O3-SiC-Ti3SiC2And (5) pouring a material.
The environment-friendly Al prepared in this example 62O3-SiC-Ti3SiC2And (3) detecting a sintered sample after the castable is subjected to heat treatment at 1450 ℃ for 3 hours in an air atmosphere: the normal-temperature breaking strength of the sample is 22-25 MPa, the high-temperature breaking strength (1450 ℃ multiplied by 0.5h) is 6.8-7.9 MPa, and the water cooling cycle times at 1100 ℃ are 9-11; the Al is2O3-SiC-Ti3SiC2The SiC oxidation rate of the castable is 0.1-0.4 wt% after the castable is oxidized for 10 hours at 1500 ℃ in the air atmosphere; the Al is2O3-SiC-Ti3SiC2The iron feeding amount of the castable is 18-21 ten thousand tons.
Example 7
Environment-friendly Al2O3-SiC-Ti3SiC2A castable and a preparation method thereof. The preparation method of the embodiment comprises the following specific steps:
step one, environment-friendly Al2O3-SiC-Ti3SiC2The castable comprises the following raw material components in percentage by weight: 40-50 parts by mass of brown corundum particles, 15-18 parts by mass of silicon carbide particles, 25-35 parts by mass of silicon carbide fine powder, 4-6 parts by mass of alumina micro powder, 2-7 parts by mass of silica micro powder, and Ti3SiC26-9 parts of powder and 1-2 parts of calcium aluminate cement;
step two, mixing the raw materials according to the raw material components and the content thereof to obtain a mixture; adding 0.5-0.8 wt% of polycarboxylate and 4-5 wt% of water into the mixture, and uniformly stirring for 20-30 min by using a powerful stirrer to obtain the environment-friendly Al2O3-SiC-Ti3SiC2And (5) pouring a material.
EXAMPLE 7 preparationIs environment-friendly Al2O3-SiC-Ti3SiC2And (3) detecting a sintered sample after the castable is subjected to heat treatment at 1450 ℃ for 3 hours in an air atmosphere: the normal-temperature breaking strength of the sample is 16-21 MPa, the high-temperature breaking strength (1450 ℃ multiplied by 0.5h) is 4.2-5.7 MPa, and the water cooling circulation times at 1100 ℃ are 8-10; the Al is2O3-SiC-Ti3SiC2The SiC oxidation rate of the castable is 0.3-0.6 wt% after the castable is oxidized for 10 hours at 1500 ℃ in the air atmosphere; the Al is2O3-SiC-Ti3SiC2The iron feeding amount of the castable is 16-19 ten thousand tons.
Example 8
Environment-friendly Al2O3-SiC-Ti3SiC2A castable and a preparation method thereof. The preparation method of the embodiment comprises the following specific steps:
step one, environment-friendly Al2O3-SiC-Ti3SiC2The castable comprises the following raw material components in percentage by weight: 50-60 parts by mass of brown corundum particles, 18-20 parts by mass of silicon carbide particles, 25-35 parts by mass of white corundum fine powder, 4-8 parts by mass of alumina micro powder, 2-6 parts by mass of silica micro powder, and Ti3SiC27-10 parts of powder and 1.5-2.5 parts of calcium aluminate cement;
step two, mixing the raw materials according to the raw material components and the content thereof to obtain a mixture; adding 0.5-0.8 wt% of polycarboxylate and 4.5-6 wt% of water into the mixture, and uniformly stirring for 20-30 min by using a powerful stirrer to obtain the environment-friendly Al2O3-SiC-Ti3SiC2And (5) pouring a material.
The environment-friendly Al prepared in this example 82O3-SiC-Ti3SiC2And (3) detecting a sintered sample after the castable is subjected to heat treatment at 1450 ℃ for 3 hours in an air atmosphere: the normal-temperature breaking strength of the sample is 18-22 MPa, the high-temperature breaking strength (1450 ℃ multiplied by 0.5h) is 6-7.4 MPa, and the water cooling circulation times at 1100 ℃ are 8-10; the Al is2O3-SiC-Ti3SiC2The SiC oxidation rate of the casting material is 0.1-0 after the casting material is oxidized for 10 hours at 1500 ℃ in the air atmosphere.4 wt%; the Al is2O3-SiC-Ti3SiC2The iron feeding amount of the castable is 16-19 ten thousand tons.
Compared with the prior art, the specific implementation mode has the following positive effects:
this embodiment uses Ti3SiC2Replace the traditional Al2O3Spherical asphalt in-SiC-C castable to fully exert Ti3SiC2The asphalt has non-wettability and high oxidation resistance to iron slag, and solves the problem that the slag erosion resistance and molten iron scouring resistance of the iron runner castable are obviously reduced due to baking and oxidation of the traditional spherical asphalt. This embodiment is achieved by directly reacting Ti3SiC2Introducing into the casting material, and casting to obtain Al2O3-SiC-Ti3SiC2The iron runner material has simple process. As the prepared castable is not added with spherical asphalt, toxic smoke generated by asphalt oxidation of iron runner materials in the baking process and environmental pollution are not involved, the prepared Al2O3-SiC-Ti3SiC2The iron runner material is environment-friendly.
Ti3SiC2Being hexagonal, the crystal structure resembles the layered structure of the formation. This particular crystal structure imparts Ti3SiC2Excellent heat conducting performance, thermal shock resistance, damage tolerance resistance, high temperature oxidation resistance and non-wettability with slag. This embodiment is described with Ti3SiC2Introduced into Al2O3the-SiC castable is an effective way for taking the oxidation resistance, high-temperature slag corrosion resistance and molten iron scouring resistance of the iron runner material into consideration. On the one hand, in Al2O3-SiC-Ti3SiC2The low-temperature ladle drying stage (800 ℃) of the castable is performed, and Ti is used3SiC2By means of the self oxidation resistance, the surface loosening phenomenon of the iron runner material caused by oxidation and burning loss of the traditional carbon source can be solved, and the weakening of the slag penetration resistance and the slag corrosion resistance of the iron runner material by the ladle drying process is avoided; on the other hand, Ti is added at the tapping stage (1500 ℃ C.) of the blast furnace3SiC2Can also be used as Al2O3-SiC-Ti3SiC2The high-efficiency antioxidant of the castable can be oxidized before SiC, so that the oxidization of SiC in the castable is thermodynamically hindered, and the molten iron scouring resistance of SiC in the castable is fully exerted. Notably, Ti3SiC2Oxidized in high temperature environment to form liquid TiO on the surface2And SiO2Due to liquid SiO2Has high viscosity, can not only fill pores in the casting material, but also effectively prevent oxygen from further flowing to Ti3SiC2Medium diffusion, kinetically preventing Al2O3-SiC-Ti3SiC2Oxidizing the casting material; further, Ti3SiC2Has high ductility at high temperature, and has a lamellar structure of Al2O3-SiC-Ti3SiC2The castable plays a two-dimensional toughening phase to toughen the castable and obviously improve Al2O3-SiC-Ti3SiC2Thermal shock resistance of the castable.
The environment-friendly Al prepared by the specific embodiment2O3-SiC-Ti3SiC2And (3) detecting a sintered sample after the castable is subjected to heat treatment at 1450 ℃ for 3 hours in an air atmosphere: the normal-temperature breaking strength of the sample is 15-26 MPa, the high-temperature breaking strength (1450 ℃ multiplied by 0.5h) is 4-8 MPa, and the water cooling circulation times at 1100 ℃ are 8-12; the Al is2O3-SiC-Ti3SiC2The SiC oxidation rate of the castable is 0.1-0.6 wt% after the castable is oxidized for 10 hours at 1500 ℃ in the air atmosphere; the Al is2O3-SiC-Ti3SiC2The iron feeding amount of the castable is 16-22 ten thousand tons.
Therefore, the specific implementation mode has the characteristics of simple process and environmental friendliness, and the prepared environment-friendly Al2O3-SiC-Ti3SiC2The castable has strong oxidation resistance, molten iron scouring resistance, excellent slag erosion/permeability resistance and high iron flux.
The above embodiments are illustrative of the present invention, and are not intended to limit the present invention, and any simple modifications of the present invention are within the scope of the present invention.

Claims (6)

1. Environment-friendly Al2O3-SiC-Ti3SiC2The preparation method of the castable is characterized by comprising the following steps: the preparation method comprises the following steps:
step one, environment-friendly Al2O3-SiC-Ti3SiC2The castable comprises the following raw material components in percentage by weight: 40-60 parts by mass of brown corundum particles, 15-20 parts by mass of silicon carbide particles, 25-35 parts by mass of silicon carbide fine powder or white corundum fine powder, 6-12 parts by mass of alumina micro powder or silica micro powder, and Ti3SiC26-10 parts of powder and 1-3 parts of calcium aluminate cement;
step two, mixing the raw materials according to the raw material components and the content thereof to obtain a mixture; adding 0.5-1 wt% of polycarboxylate and 4-6 wt% of water into the mixture, and uniformly stirring for 20-30 min by using a stirrer to obtain the environment-friendly Al2O3-SiC-Ti3SiC2And (5) pouring a material.
2. The environment-friendly Al of claim 12O3-SiC-Ti3SiC2The preparation method of the castable is characterized in that the Al of the brown corundum particles2O3The content is more than or equal to 93 wt%; the particle size of the brown corundum particles is 3-8 mm.
3. The environment-friendly Al of claim 12O3-SiC-Ti3SiC2The preparation method of the castable is characterized in that the SiC content of the silicon carbide particles and the silicon carbide fine powder is more than or equal to 97 wt%; the granularity of the silicon carbide particles is 0-1 mm, and the granularity of the silicon carbide fine powder is less than or equal to 0.088 mm.
4. The environment-friendly Al of claim 12O3-SiC-Ti3SiC2The preparation method of the castable is characterized in that the white corundum fine powder and the Al of the alumina micropowder2O3The content is more than or equal to 98 wt%; the granularity of the white corundum fine powder is less than or equal to 0.088mm, and the granularity of the alumina micro powder is less than or equal to 0.088mmThe particle size is less than or equal to 2 mu m.
5. The environment-friendly Al of claim 12O3-SiC-Ti3SiC2The preparation method of the castable is characterized in that the Ti is3SiC2The purity of the powder is more than or equal to 99 wt%, and the granularity is less than or equal to 1 mu m.
6. Environment-friendly Al2O3-SiC-Ti3SiC2The castable is characterized in that: the environment-friendly Al2O3-SiC-Ti3SiC2The castable is the environment-friendly Al according to any one of claims 1-52O3-SiC-Ti3SiC2Environment-friendly Al prepared by preparation method of castable2O3-SiC-Ti3SiC2And (5) pouring a material.
CN202010504607.9A 2020-06-05 2020-06-05 Environment-friendly Al2O3-SiC-Ti3SiC2Castable and preparation method thereof Pending CN111825434A (en)

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Application publication date: 20201027