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Silicon nitride bonded corundum permeable brick and preparation method

A technology of air-permeable bricks and silicon nitride, which is applied in the field of inorganic non-metallic materials, can solve the problems of no public invention patents and documents retrieved, and achieve the effects of excellent thermal spalling resistance, long service life, simple and feasible process

Inactive Publication Date: 2011-12-14
ZHENGZHOU UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] At present, there are no published invention patents and documents on the in-situ formation of silicon nitride bonded corundum permeable bricks by casting molding

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] According to the ratio of parts by weight, 6 parts of elemental silicon powder, 3.0 parts of hydrated alumina, 8 parts of alumina fine powder, 0.15 parts of organic water reducer (polyethylene glycol) as a dispersant, and 13 parts of tabular corundum fine powder Put it in a ball mill tank and dry mix it evenly to obtain a mixed powder; add 55 parts of tabular corundum coarse particles and 15 parts of tabular corundum medium particles into the mixer and stir for 3-5 minutes, then add the mixed powder into the mixer and stir evenly. Slowly add 4.4% of the total amount of water and mix it evenly to form a mud, put it into the mold, vibrate and cast it, maintain it at 40°C for 24 hours, demould it, and then dry it at 300°C to get the green body.

[0027] Put the air-permeable brick body into a drying kiln, raise the temperature to 500°C at a rate of 60°C / hour and keep it for 8 hours to remove the pre-embedded organic burnt matter to form slits, and then cool naturally to roo...

Embodiment 2

[0031] According to the ratio of parts by weight, 9 parts of elemental silicon powder, 2 parts of hydrated alumina, 9 parts of alumina micropowder, 0.20 parts of organic water reducer (polyethylene glycol) as a dispersant, 14 parts of fused white corundum fine powder Put 50 parts of platy corundum coarse particles and 16 parts of fused white corundum medium particles into the mixer and stir for 3-5 minutes, then add the mixed powder into the mixer and stir Evenly, slowly add 4.8% of the total amount of water to mix evenly to form a mud, put it into the mold, vibrate cast it into shape, maintain it at 35°C for 24 hours, demould it, and then dry it at 300°C to get the green body.

[0032] Put the air-permeable brick body into the drying kiln, raise the temperature to 600°C at a rate of 100°C / hour and keep it for 8 hours to remove the pre-embedded organic burnt matter to form slits, and then cool naturally to room temperature.

[0033] Put the above materials in a nitriding furna...

Embodiment 3

[0036] According to the ratio of parts by weight, 12 parts of elemental silicon powder, 2 parts of hydrated alumina, 8 parts of alumina fine powder, 0.2 parts of organic water reducer (polyacrylic acid) as a dispersant, and 8 parts of tabular corundum fine powder are placed in In a ball mill tank, dry mix evenly to obtain a mixed powder; sequentially add 25 parts of fused brown corundum coarse particles, 30 parts of tabular corundum coarse particles, and 15 parts of tabular corundum medium particles into the mixer and stir for 3-5 minutes, and then mix the powder Add in a mixer, stir evenly, slowly add 5% of the total amount of water to mix evenly into a mud, put it into a mold, vibrate and cast it into shape, maintain at 50°C for 12 hours, demould, and then dry at 300°C to obtain a green body.

[0037] Put the air-permeable brick body into a drying kiln, raise the temperature to 700°C at a rate of 50°C / hour and keep it for 5 hours to remove the pre-embedded organic burnt matte...

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Abstract

The invention discloses silicon nitride and corundum combined breathable bricks and a preparation method. The silicon nitride and corundum combined breathable bricks are characterized by being prepared by the following steps: adding water into corundum particles and fine powder, hydrated alumina, alumina micro powder and monomer silicon powder, which serve as raw materials, mixing to obtain a sludge material; pouring in molds to form breathable brick bodies; demolding, curing and drying; removing pre-buried organic burning-out material by pre-burning to form slits; and preparing by high-temperature nitridation treatment. The bricks comprise: 70 to 80 parts of corundum particles and fine powder, 3 to 12 parts of active alumina micro powder, 1 to 6 parts of hydrated alumina, 4 to 15 parts of monomer silicon powder and organic water reducer serving as a dispersant in an amount which is 0.05 to 0.30 percent based on the total weight parts of the previous raw materials. The bricks overcomethe drawbacks of low thermal-shock resistance and low stripping resistance of the conventional corundum-spinel breathable brick material, are expected to replace conventional chromium corundum and corundum-spinel breathable brick materials for making steel and have the characteristics of high blow-off rate, high stripping resistance, long service life and the like.

Description

technical field [0001] The invention belongs to the technical field of inorganic non-metallic materials. Specifically, it uses corundum particles and fine powder, alumina micropowder, and elemental silicon powder as raw materials, mixes it with water to make mud, vibrates and pours it into a green body for breathable bricks, and prepares silicon nitride bonded bricks through a high-temperature nitriding process. The method of corundum permeable brick. Background technique [0002] Refining outside the furnace is one of the most important links in the modern steelmaking process. Blowing argon into the molten steel for stirring is the core technology of refining, and the ventilation brick is an indispensable air blowing functional component for ladle refining. Due to the special position and environment of the breathable brick in the ladle, the use conditions are relatively harsh, and the requirements for the life of the breathable brick, the success rate of air blowing, and ...

Claims

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Application Information

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IPC IPC(8): C04B35/66C04B35/10C04B35/622
Inventor 叶方保贾全利蓝亭钱学义詹家林王立峰樊能仲
Owner ZHENGZHOU UNIV
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