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Method for preparing magnesia carbon brick non-aluminum antioxidant coating

The technology of anti-oxidation coating and anti-oxidation coating is applied in the field of refractory materials, which can solve the problems of affecting the quality of cord steel, complicated preparation process and high production cost, and achieve good anti-oxidation performance, simple implementation process and improved strength. Effect

Inactive Publication Date: 2012-05-23
WUHAN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the above-mentioned patented technologies have improved the oxidation resistance of carbonaceous materials to varying degrees, their preparation process is relatively complicated, and the production cost is also high. The prepared coatings all contain Al 2 o 3 components, which will lead to the increase of aluminum in molten steel, which will significantly affect the quality of cord steel

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] A method for preparing an aluminum-free anti-oxidation coating for magnesia-carbon bricks: first, 40-45wt% of boron glass, 10-15wt% of SiC, 30-35wt% of fused silica, 1-3wt% of MgO, 5-8wt% % CaO and 0.1-0.15wt% carboxymethyl cellulose are mixed, plus 20-25wt% silica sol and 50-55wt% water of the above mixture, mixed and milled for 20-40 minutes to prepare an anti-oxidation coating. Then paint the prepared anti-oxidation coating evenly on the surface of the magnesia-carbon brick, dry it naturally, and dry it at 110°C for a drying time of ≥8 hours. Finally, place the dried magnesia-carbon brick in a high-temperature furnace, raise the temperature to 1150-1200° C., and keep it warm for 20-40 minutes to obtain an aluminum-free anti-oxidation coating for the magnesia-carbon brick.

[0017] After firing, there is a glassy glaze layer on the surface of the magnesia carbon brick, the surface is dense, and no defects such as cracks and voids are found, which is the aluminum-free ...

Embodiment 2

[0020] A method for preparing an aluminum-free anti-oxidation coating for magnesia-carbon bricks: first, 45-50wt% of boron glass, 10-15wt% of SiC, 25-30wt% of fused silica, 2-4wt% of MgO, 7-10wt% % CaO and 0.2-0.25wt% carboxymethyl cellulose are mixed, plus 25-30wt% silica sol and 55-60wt% water of the above mixture, mixed and milled for 20-40 minutes to prepare an anti-oxidation coating. Then paint the prepared paint evenly on the surface of the magnesia-carbon brick, dry it naturally, and dry it at 110°C for a drying time of ≥8 hours; finally put the dried magnesia-carbon brick in a high-temperature furnace and heat it up to 1200 ~1250℃, keep warm for 20~40 minutes, and prepare aluminum-free anti-oxidation coating for magnesia carbon bricks.

[0021] After firing, there is a glassy glaze layer on the surface of the magnesia carbon brick, the surface is dense, and no defects such as cracks and voids are found, which is the aluminum-free anti-oxidation coating of the magnesia ...

Embodiment 3

[0024] A method for preparing an aluminum-free anti-oxidation coating for magnesia-carbon bricks: first, 50-55wt% of boron glass, 15-20wt% of SiC, 20-25wt% of fused silica, 2-4wt% of MgO, 5-7wt% % CaO and 0.25-0.3wt% carboxymethyl cellulose, plus 30-35wt% silica sol and 50-55wt% water of the above mixture, mixed and milled for 20-40 minutes to make aluminum-free anti-oxidation coating . Then paint the prepared paint evenly on the surface of the magnesia-carbon brick, dry it naturally, and dry it at 110°C for a drying time of ≥8 hours; finally put the dried magnesia-carbon brick in a high-temperature furnace and heat it up to 1150 ~ 1200 ° C, heat preservation for 20 ~ 40 minutes, the aluminum-free anti-oxidation coating of magnesia carbon bricks is prepared.

[0025] After firing, there is a glassy glaze layer on the surface of the magnesia carbon brick, the surface is dense, and no defects such as cracks and voids are found, which is the aluminum-free anti-oxidation coating ...

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Abstract

The invention more particularly relates to a method for preparing magnesia carbon brick non-aluminum antioxidant coating, which has the technical scheme of comprising the steps of: firstly mixing 40-60wt% of boron glass, 5-20wt% of SiC, 20-35wt% of fused quartz, 1-5wt% of MgO, 5-10wt% of CaO and 0.1-0.3% of carboxymethyl cellulose, and additionally adding ludox accounting for 20-40wt% of the mixed material or liquid water glass accounting for 40-60wt% of the mixed material, then additionally adding water accounting for 50-60wt% of the mixed material, carrying ball-milling for 20-40min, and preparing antioxidant paint; then, evenly painting the prepared antioxidant paint on the surface of a magnesia carbon brick, naturally drying and stoving at 110 DEG C; and finally, putting the stoved magnesia carbon brick in a high temperature furnace, heating up to 1150-1250 DEG C, carrying out heat preservation for 20-40min, and preparing the magnesia carbon brick non-aluminum antioxidant coating.The invention has the characteristics of simple technique and low cost, and can be glazed at the temperature range of 500-1200 DEG C; and the prepared magnesia carbon brick non-aluminum antioxidant coating has good anti-oxidation performance.

Description

technical field [0001] The invention belongs to the technical field of refractory materials, and in particular relates to a preparation method of an aluminum-free anti-oxidation coating for magnesia-carbon bricks. Background technique [0002] As a high-quality steel, cord steel has high requirements on the purity of the steel due to its working conditions and safety performance requirements. The composition of inclusions must be strictly controlled. For example, inclusions > 30 μm are not allowed to exist in one strand, especially Al 2 o 3 And calcium aluminate inclusions are not allowed to exist because they are not plastic. Therefore, the reasonable selection of refractory materials is an important factor to ensure the quality of steel products. [0003] Magnesia carbon bricks are used in cord steel smelting ladles because of their good resistance to slag erosion and permeability, and thermal shock resistance. But the biggest problem is that magnesia-carbon bricks c...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09D1/02C09D5/00C04B41/68
Inventor 顾华志胡开艳李维锋
Owner WUHAN UNIV OF SCI & TECH
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