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Aluminum carbon castable with graphite microspheres as carbon source and preparation method thereof

A castable and microsphere technology, which is applied in the field of aluminum-carbon castables, can solve the problems of insufficient oxidation resistance and penetration resistance, unsatisfactory thermal shock resistance, and large water addition to castables to achieve oxidation resistance and Improved thermal shock stability, high sphericity, and reduced water addition

Inactive Publication Date: 2018-06-19
WUHAN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the poor wettability of the above-mentioned carbon and water, the amount of water added to the castable is relatively large
The sample after casting is not dense enough, resulting in insufficient oxidation resistance and penetration resistance
"A new type of main iron ditch castable" (CN201110044222.X) patent technology discloses the use of modified nano-carbon powder to replace asphalt, improve its oxidation resistance and carbon residue rate, and also improve the anti-burst performance during baking, but Thermal shock resistance is less than ideal

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] An aluminum-carbon casting material using graphite microspheres as a carbon source and a preparation method thereof. With 40-45wt% brown corundum, 32-35wt% silicon carbide, 13-15wt% active α-alumina micropowder, 1-2wt% silicon powder, 6-7wt% graphite microspheres and 2-3wt% The calcium aluminate cement is used as a raw material, mixed, and then 0.1-0.2 wt% of polycarboxylates are added to the raw material, and stirred evenly to obtain an aluminum-carbon castable with graphite microspheres as a carbon source.

[0024] The aluminum-carbon castable prepared in this example uses graphite microspheres as the carbon source, the amount of water added is 5-6wt% of the raw material, mixed evenly, vibrating casting and molding, curing at room temperature for 24-30 hours, demoulding, at 100-120 °C Dry for 24 hours, after testing: the flow value is 210-230cm; the bulk density is 2.90-2.95g / cm 3 The compressive strength at room temperature is 41.5-42.6MPa; the flexural strength at ...

Embodiment 2

[0026] An aluminum-carbon casting material using graphite microspheres as a carbon source and a preparation method thereof. With 45-50wt% brown corundum, 30-32wt% silicon carbide, 11-13wt% active α-alumina micropowder, 2-3wt% silicon powder, 5-6wt% graphite microspheres and 2-3wt% The calcium aluminate cement is used as a raw material, mixed, and then 0.1-0.2 wt% of polycarboxylates are added to the raw material, and stirred evenly to obtain an aluminum-carbon castable with graphite microspheres as a carbon source.

[0027] The aluminum-carbon castable prepared in this example uses graphite microspheres as the carbon source, the amount of water added is 4.5-5.5wt% of the raw material, mixed evenly, vibrating casting, curing at room temperature for 24-30h, demoulding, at 100-120°C Dry for 24 hours, after testing: the flow value is 215-230cm; the bulk density is 2.97-3.07g / cm 3 The compressive strength at room temperature is 42.3-44.2MPa; the flexural strength at room temperatu...

Embodiment 3

[0029] An aluminum-carbon casting material using graphite microspheres as a carbon source and a preparation method thereof. With 50-55wt% brown corundum, 26-30wt% silicon carbide, 9-11wt% active α-alumina micropowder, 3-4wt% silicon powder, 4-5wt% graphite microspheres and 3-4wt% The calcium aluminate cement is used as a raw material, mixed, and 0.2-0.3 wt% of polycarboxylates are added to the raw material, and stirred evenly to obtain an aluminum-carbon castable with graphite microspheres as a carbon source.

[0030] The aluminum-carbon castable prepared in this example uses graphite microspheres as the carbon source, the amount of water added is 4.0-5.0wt% of the raw material, mixed evenly, vibrating casting, curing at room temperature for 24-30h, demoulding, at 100-120°C Dry for 24 hours, after testing: the flow value is 220-235cm; the bulk density is 2.97-3.10g / cm 3 The compressive strength at room temperature is 44.2-46.7MPa; the flexural strength at room temperature is ...

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Abstract

The invention relates to an aluminum carbon castable with graphite microspheres as the carbon source and a preparation method thereof. The technical scheme includes: adopting 40-70wt% of brown fused alumina, 15-35wt% of silicon carbide, 3-15wt% of active alpha-alumina micropowder, 1-7wt% of silicon powder, 1-7wt% of graphite microspheres and 2-6wt% of calcium aluminate cement as the raw materials,performing mixing, then adding polycarboxylic acid accounting for 0.1-0.3wt% of the raw materials, and stirring the substances evenly, thus obtaining the aluminum carbon castable with graphite microspheres as the carbon source. Detection indicates that: the flow value is 210-240cm; the volume density is 2.85-3.10g / cm<3>; the ambient compressive strength is 41.5-47.7MPa; the normal temperature flexural strength is 6.5-10.6MPa; and the apparent porosity is 10.5-14%. After 1450DEG C / 3h treatment, the flexural compressive strength, oxidation resistance and thermal shock stability are significantly improved. The aluminum carbon castable with graphite microspheres as the carbon source prepared by the method provided by the invention not only has good fluidity, but also has greatly improved flexural compressive strength, oxidation resistance and thermal shock stability.

Description

technical field [0001] The invention belongs to the technical field of aluminum-carbon castables. In particular, it relates to an aluminum-carbon castable using graphite microspheres as a carbon source and a preparation method thereof. Background technique [0002] Carbon composite refractories are widely used in the steel industry due to their unique mechanical and chemical properties, and their main carbon source is graphite. The addition of graphite not only endows refractory materials with excellent thermal shock resistance and corrosion resistance, but also because carbon can react with additives Al or Si in refractory materials to form Al 4 C 3 And SiC and other ceramic reinforcing phases, the strength and toughness of carbon composite refractory materials are greatly improved. However, due to technological reasons, the development of carbonaceous materials in the aspect of amorphous is not very smooth. The main problem of the carbon-containing refractories formed ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/66
CPCC04B35/66C04B2235/3217C04B2235/3418C04B2235/3826C04B2235/425C04B2235/449
Inventor 张海军李赛赛张少伟刘江昊王军凯葛胜涛
Owner WUHAN UNIV OF SCI & TECH
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