Boron nitride ceramic side seal plate for thin strip continuous casting and preparation method thereof

A technology of boron nitride and side sealing plates, which is applied in the field of continuous casting of iron and steel, can solve the problems of uniform phase composition and microstructure of side sealing plates, thermal expansion mismatch of side sealing plates, and easy generation of cold blocks on side sealing plates, etc. It achieves the effects of excellent corrosion resistance to molten steel, good thermal shock resistance, and improved service life

Inactive Publication Date: 2015-09-30
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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  • Boron nitride ceramic side seal plate for thin strip continuous casting and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Step 1: Mix hexagonal boron nitride powder, aluminum nitride powder, magnesium aluminum spinel powder, mullite powder, MgAlON powder, AlON powder and CaAl 4 o 7 The powders were milled for 24 hours with a ball mill using a wet ball milling method. The ball milling solvent in the ball milling process was absolute ethanol. The purity of the above-mentioned raw materials must reach the level of analytical purity. During the above-mentioned ball milling process, the hexagonal boron nitride slurry, nitrogen Aluminum paste, magnesium aluminum spinel paste, mullite paste, MgAlON paste, AlON paste, CaAl 4 o 7 The particle size of the solid particles in the slurry is 2 μm, and then the above slurry is dried to form the corresponding powder;

[0027] Step 2: Calculated by mass percentage: 70% hexagonal boron nitride, 10% aluminum nitride powder, 5% magnesium aluminum spinel, 5% mullite, 5% MgAlON, 3% AlON, CaAl 4 o 7 2% Select the powder after the drying treatment in step 1, ...

Embodiment 2

[0036] Step 1: Mix hexagonal boron nitride powder, aluminum nitride powder, magnesium aluminum spinel powder, mullite powder, MgAlON powder, CaZrO 3 Powder and CaTiO 3 The powders were ball milled for 36 hours with a ball mill using wet ball milling. The ball milling solvent in the ball milling process was acetone. Slurry, Magnesium Aluminum Spinel Slurry, Mullite Slurry, MgAlON Slurry, CaZrO 3 Slurry and CaTiO 3 The particle size of the solid particles in the slurry is 4 μm, and then the above slurry is dried to form the corresponding powder;

[0037] Step 2: Calculated by mass percentage: 60% of hexagonal boron nitride, 15% of aluminum nitride powder, 10% of magnesium aluminum spinel, 10% of mullite, 2% of MgAlON, CaZrO 3 2% and CaTiO 3 1% Select the powder after the drying treatment in step 1, and carry out the wet ball milling and mixing treatment on the above powder through a ball mill. The time of the wet ball milling mixing treatment is 24 hours, until the mixture i...

Embodiment 3

[0046] Step 1: Mix hexagonal boron nitride powder, aluminum nitride powder, magnesium aluminum spinel powder, mullite powder, AlON powder, CaAl 4 o 7 Powder, CaZrO 3 Powder and CaTiO 3 The powders were milled for 36 hours with a ball mill using a wet ball milling method. The ball milling solvent in the ball milling process was technical alcohol with a purity of more than 95%. Boron slurry, aluminum nitride slurry, magnesium aluminum spinel slurry, mullite slurry, AlON slurry, CaAl 4 o 7 Slurry, CaZrO 3 Slurry and CaTiO 3 The particle size of the solid particles in the slurry is 6 μm, and then the above slurry is dried to form the corresponding powder;

[0047]Step 2: Calculated by mass percentage: 30% hexagonal boron nitride, 30% aluminum nitride, 20% magnesium aluminum spinel, 10% mullite, 5% AlON, CaAl 4 o 7 2%, CaZrO 3 2% and CaTiO 3 1%, select the powder after the drying treatment in step 1, and carry out the wet ball milling mixing process on the above powder th...

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Abstract

The invention discloses a boron nitride ceramic side seal plate for continuous thin-strip casting. The boron nitride ceramic side seal plate is characterized by comprising the following chemical components by mass percent: 20%-75% of hexagonal boron nitride, 10%-55% of aluminum nitride powder, 5%-40% of magnesium aluminate spinel, 5%-20% of mullite and 0.5%-15% of an additive, wherein the additive is selected from one or combination of several of MgAlON, AlON, CaAl4O7, CaZrO3 and CaTiO3. The boron nitride ceramic side seal plate manufactured by adopting novel ceramic formula and preparation method is relatively high in density, fire-resistant degree and rupture strength, so that the side seal plate is fully ensured to be not softened in a use process. Meanwhile, the side seal plate is low in heat conduction rate and good in thermal shock resistance, so that the side seal plate can well resist the thermal shock of molten steel in the use process and the service life of the side seal plate is prolonged.

Description

technical field [0001] The invention relates to the technical field of iron and steel continuous casting, in particular to a boron nitride ceramic side sealing plate for thin 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 the tundish and directly rolls it into thin plates with a thickness of several millimeters. Side sealing plate technology is one of the most critical technologies in thin strip continuous casting technology, and is a key factor affecting the quality of cast strip and process stability in the process of thin strip continuous casting. At present, there are mainly three side sealing me...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/66
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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