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Al4SiC4-Al2OC composite refractory materials and preparation method thereof

A technology of refractory materials and binders, applied in the field of composite refractory materials, can solve the problems of difficult industrialization and high cost, and achieve the effects of slowing down corrosion, improving performance, and preventing cracking and peeling

Inactive Publication Date: 2009-05-06
WUHAN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But the corresponding cost is relatively high, it is difficult to realize the industrialization of production

Method used

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0011] a kind of Al 4 SiC 4 -Al 2 OC composite refractory material and its preparation method. The technical scheme is: first mix 30-35wt% of bauxite, 40-45wt% of industrial charcoal powder and 20-25wt% of metal aluminum powder, and add 5-8wt% calcium lignosulfonate of the above mixture, wood Calcium sulfonate is first dissolved into an aqueous solution and then used for batching, stirred for 5-15 minutes, pressed and molded and dried at 90-110°C for 12-24 hours; then under an argon atmosphere and at 1600-1700°C×5 Sintering is carried out under the condition of ~6 hours, and Al is produced after natural cooling 4 SiC 4 -Al 2 OC composite refractories.

[0012] The physicochemical index of mixture in this embodiment 1: the Al of bauxite 2 o 3 The content is ≥48wt%, and the particle size is 0.1-0mm; the C content of the industrial carbon powder is ≥80wt%, and the particle size is 0.1-0mm; the Al content of the metal aluminum powder is ≥90%, and the particle size is 0.1-0...

Embodiment 2

[0014] a kind of Al 4 SiC 4 -Al 2 OC composite refractory material and its preparation method. The technical scheme is: first mix 35-40wt% of bauxite, 35-40wt% of industrial charcoal powder and 25-30wt% of metal aluminum powder, and add 6-7wt% of sodium lignosulfonate from the above mixture. Sodium sulfonate is first dissolved into an aqueous solution and then used for batching, stirred for 15-25 minutes, pressed and dried at 80-100°C for 18-30 hours; then under an argon atmosphere and at 1700-1800°C×4 Sintering is carried out under the condition of ~5 hours, and Al is produced after natural cooling 4 SiC 4 -Al 2 OC composite refractories.

[0015] The physical and chemical indicators of the mixture in this embodiment 2 are the same as in embodiment 1.

Embodiment 3

[0017] a kind of Al 4 SiC 4 -Al 2 OC composite refractory material and its preparation method. The technical scheme is: first mix 40-45wt% of bauxite, 30-35wt% of industrial carbon powder and 25-30wt% of metal aluminum powder, add 3-6wt% of the above-mentioned mixture of sulfurous acid pulp waste liquid, stir 10-20 minutes, press and dry at 60-80°C for 24-36 hours; then sinter under argon atmosphere and at 1750-1800°C for 2-3 hours, and cool naturally to obtain Al 4 SiC 4 -Al 2 OC composite refractories.

[0018] The physical and chemical indicators of the mixture in the present embodiment 3 are the same as in the embodiment 1.

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Abstract

The invention relates to a composite refractory material of Al4SiC4 and Al2OC and a method for preparing the same. The technical proposal adopted by the invention is as follows: firstly, 30 to 70 weight percent of bauxite, 10 to 45 weight percent of industrial carbon powder, and 20 to 55 weight percent of metallic aluminium powder are mixed; and the mixture is added with 3 to 10 weight percent of bonding agent to be stirred for 5 to 25 minutes, is pressed to be shaped, and is dried for 12 to 36 hours under the condition of between 60 and 110 DEG C or naturally dried for 24 to 48 hours indoors; and secondly, the mixture is sintered for 2 to 6 hours under argon atmosphere and under the condition of between 1,600 and 1,800 DEG C, and is cooled naturally to obtain the composite refractory material of the Al4SiC4 and the Al2OC. The composite refractory material has the characteristics of rich raw material resource, low production cost and easy industrialized production. The composite refractory material of the Al4SiC4 and the Al2OC prepared by the method not only has excellent performance, but also can prolong the service life, is suitable for a novel furnace lining material for nonferrous metal and iron and steel smelting equipment, and particularly suitable for producing ladle inside lining and refining furnace lining of clean steel such as low carbon steel, ultra-low carbon steel and so on.

Description

technical field [0001] The invention belongs to the technical field of composite refractories. Especially involving an Al 4 SiC 4 -Al 2 OC composite refractory material and its preparation method. Background technique [0002] al 4 SiC 4 -Al 2 OC composite material has excellent high temperature resistance and thermal stability. It is the raw material for the preparation of new lining materials for non-ferrous metals and iron and steel smelting equipment. It is also an antioxidant for carbon-containing refractory materials and non-oxide refractory materials to prevent oxidation. It is especially suitable for production The ladle lining and refining furnace lining of clean steel such as low carbon steel and ultra-low carbon steel can replace alumina-carbon and high-bauxite-carbon composite refractory materials, which is conducive to improving the quality of steel and has a good use effect. [0003] Aluminum carbide silicide (Al 4 SiC 4 ) has a high melting point (abo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/66C04B35/56
Inventor 邓承继祝洪喜白晨李涛辜孔良匡建磊
Owner WUHAN UNIV OF SCI & TECH
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