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Ceramic side sealing plate for twin-roll thin-strip continuous casting and preparation method thereof

A twin-roll thin-strip continuous casting and side-sealing technology, which is applied in the field of steel continuous casting, can solve the problems of uniform phase composition and microstructure of the side-sealing plates, mismatch of thermal expansion of the side-sealing plates, and easy generation of cold blocks on the side-sealing plates, etc. problems, to achieve the effect of excellent corrosion resistance to molten steel, good thermal shock resistance, and improved service life

Inactive Publication Date: 2014-07-30
武汉钢铁有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This is because, in general, while ensuring good thermal shock resistance of the side sealing plate, it is impossible to ensure that the side sealing plate has low thermal conductivity, which makes it easy to generate cold blocks on the surface of the side sealing plate, resulting in The side sealing plate is worn out, shortening the service life
On the other hand, when sintering large-volume and high-density side seals, it is difficult to make the phase composition and microstructure of the side seals uniform, which causes thermal expansion mismatch inside the side seals, resulting in thermal shock damage

Method used

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  • Ceramic side sealing plate for twin-roll thin-strip continuous casting and preparation method thereof

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preparation example Construction

[0026] A preparation method of a ceramic side sealing plate for twin-roll thin strip continuous casting, which comprises the following steps:

[0027] Step 1: Combine hexagonal boron nitride powder, Si 3 N 4 Powder, zirconium mullite powder, TiN powder and additives were ball milled with wet ball milling method for at least 24 hours (enough ball milling time can ensure the particle size, and fine particle size can increase the specific surface area of ​​raw materials, thereby improving The activity of raw materials), the ball milling solvent in the ball milling process is absolute ethanol or industrial alcohol with a purity of more than 95%, respectively forming hexagonal boron nitride slurry, Si 3 N 4 Slurry, zirconium mullite slurry, TiN slurry and additive slurry, the hexagonal boron nitride slurry, Si 3 N 4 The particle size of the solid particles in the slurry, zircon mullite slurry, TiN slurry and additive slurry is 0.1-10 μm, and then the hexagonal boron nitride slu...

Embodiment 1

[0035] Embodiment 1: in step 1, hexagonal boron nitride powder, Si 3 N 4 powder, zircon mullite powder, TiN powder and Y 2 o 3 The powders were milled for 30 hours with a ball mill using a wet ball milling method. The ball milling solvent was absolute ethanol. During the ball milling process, the hexagonal boron nitride slurry, Si 3 N 4 slurry, zircon mullite slurry, TiN slurry and Y 2 o 3 The particle size of the slurry is 2 μm;

[0036] From the powder of step 1 in step 2, by mass percentage: hexagonal boron nitride powder 55%, Si 3 N 4 Powder 15%, Zirconium Mullite Powder 15%, TiN Powder 10%, Y 2 o 3 5% of the powder is selected from the powder to be mixed by wet ball milling, and the time of mixing by wet ball milling is 12 hours;

[0037] In step 3, during the process of granulating the mixed slurry with a spray granulator, 15% of the particle size range of the control powder is below 0.5 mm, and 60% of the particle size range is between 0.5 and 1.5 mm. The ran...

Embodiment 2

[0041] Embodiment 2: in step 1, hexagonal boron nitride powder, Si 3 N 4 powder, zircon mullite powder, TiN powder, Y 2 o 3 Aluminum oxide powder, industrial alumina powder, and MgO powder were milled for 28 hours in a ball mill using a wet ball milling method, and the ball milling solvent was absolute ethanol. 3 N 4 Slurry, Zirconium Mullite Slurry, TiN Slurry, Y 2 o 3 The particle size of slurry, industrial alumina slurry, and MgO slurry is 5 μm;

[0042] From the powder in step 1 in step 2, by mass percentage: hexagonal boron nitride powder 60%, Si 3 N 4 10% powder, 20% zircon mullite powder, 5% TiN powder, Y 2 o 3 Powder 2%, industrial alumina powder 2%, MgO powder 1% choose the powder material to be treated by wet ball milling, and the time of described wet ball milling mixing process is 36 hours;

[0043]In step 3, in the process of granulating the mixed slurry with a spray granulator, 20% of the particle size range of the control powder is below 0.5 mm, and 70...

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Abstract

The invention discloses a ceramic side sealing plate for twin-roll thin-strip continuous casting. The ceramic side sealing plate is characterized by comprising the following chemical components in percentage by mass: 40-75% of hexagonal boron nitride powder, 10-45% of Si3N4 powder, 10-30% of zirconia-mullite powder, 3-15% of TiN powder and 0.5-10% of additive, wherein the additive is one or a combination of several of Y2O3, industrial Al2O3, MgO and light magnesium carbonate. The side sealing plate has high temperature resistance, high strength, thermal shock resistance and low heat conductivity by developing the novel formula of the novel side sealing plate and adjusting a preparation method of the novel side sealing plate.

Description

technical field [0001] The invention relates to the technical field of iron and steel continuous casting, in particular to a ceramic side sealing plate for twin-roll strip continuous casting and a preparation method thereof. Background technique [0002] Thin strip continuous casting is a revolutionary short process in the field of steel strip industrial production. And a series of conventional processes such as heating and head cutting have created the latest technology and process of high efficiency, energy saving and environmental protection, which directly pours molten steel through a tundish and directly rolls it into a thin plate with a thickness of several millimeters. [0003] The side seal technology is the most critical part of the twin-roll thin strip continuous casting technology, and it is the key factor affecting the quality of the cast strip and the process stability in the thin strip continuous casting process. The side seal can restrain the metal liquid and ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/5833C04B35/622C04B35/66
Inventor 刘孟宋仪杰周桂峰刘继雄薛改凤徐国涛邹龙张洪雷何明生陈华圣刘黎周旺枝
Owner 武汉钢铁有限公司
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