Manufacturing method of mullite-boron nitride composite ceramic side sealing plate for thin strip continuous casting

A technology of composite ceramics and manufacturing methods, which is applied in the field of ceramic composite materials, can solve problems such as low strength, short service life of side sealing plates, and short service life, and achieve the goals of improving use stability, prolonging service life, and reducing production costs Effect

Active Publication Date: 2017-05-24
武汉钢铁有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, the solid side sealing plates researched and developed abroad generally have the problem of low strength, and most of them cannot meet the requirements of industrial production, and only a few of them have been commercialized.
[0004] Chinese patent CN102161082A discloses a side sealing plate for thin strip continuous casting and its manufacturing method. It uses boron nitride, zirconium boride, graphite and carbon fiber to prepare a ceramic side sealing plate for thin strip continuous casting. The thermal conductivity of the side sealing plate is Rate 22W (m K) -1 , good oxidation resistance and wear resistance, but the service life of this side sealing plate is short
Chinese patent CN101648260A discloses a twin-roll strip continuous casting side seal and its manufacturing method, which uses a boron nitride panel and a substrate of aluminum-silicon thermal insulation material to produce a composite side seal The thermal insulation performance of the composite side sealing plate is good, but the thermal shock resistance of this side sealing plate is not good, resulting in a short service life of the side sealing plate
Chinese patent CN102173792A discloses a ceramic composite material for thin strip continuous casting side seals and its preparation method, which uses boron nitride, carbides, nitrides and oxides to make side seals, and the obtained side seals have a high density 94%~99%, room temperature flexural strength 260~420MPa, fracture toughness 3~8MPa m 1 / 2 , although the side sealing plate meets the use requirements in terms of strength, its service life is very short due to its poor resistance to the thermal shock of molten steel
Chinese patent CN03150584.8 discloses an aluminum zirconium carbon-boron nitride composite side seal plate, which uses corundum, zirconium mullite, carbon materials and hexagonal boron nitride as the main raw materials, and uses phenolic resin as the binder. Composite side seals were prepared by compression molding. The side seals have good thermal shock stability and corrosion resistance to molten steel, but they are not practical and cannot be popularized and applied.
Chinese patent CN200820035154.4 discloses a side sealing plate of a twin-roller casting and rolling thin strip mill, which adopts a side sealing plate made of fused silica. Although the thermal shock resistance of this side sealing plate is good, its Poor service life and wear resistance
In general, domestic research on side seals is still in the process of laboratory research and simulation experiments, and ceramic side seals that fully meet the requirements of use have not yet been produced. The performance of side seals still restricts the industrialization process of thin strip continuous casting. , therefore, the research and development of high-performance ceramic side seal material is of great significance to the industrial production of thin strip continuous casting

Method used

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  • Manufacturing method of mullite-boron nitride composite ceramic side sealing plate for thin strip continuous casting

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Embodiment 1

[0026] A method for manufacturing a mullite-boron nitride composite ceramic side sealing plate for thin strip continuous casting, which comprises the following steps:

[0027] 1) Selection of raw materials: The selected raw materials include: hexagonal boron nitride (h-BN) with a particle size of 2 μm, which is chemically pure; silicon dioxide (SiO2) with a particle size of 3 μm 2 ), analytically pure; aluminum nitrate (Al(NO) with a particle size of 4 μm 3 ) 3 9H 2 O), is analytically pure; Ammonia (NH 3 ·H 2 O) is analytically pure; boron trioxide (B) with a particle size of 3 μm 2 o 3 ), is chemically pure; aluminum nitride (AlN) with a particle size of 1 μm is chemically pure; silicon nitride (SiN) with a particle size of 3 μm 3 N4 ), is chemically pure; titanium boride (TiB 2 ), is chemically pure;

[0028] 2) Preparation of the precursor slurry: the hexagonal boron nitride powder mass percentage is 50%, the sum of the mass percentages of silicon dioxide and alumi...

Embodiment 2

[0036] A method for manufacturing a mullite-boron nitride composite ceramic side sealing plate for thin strip continuous casting, which comprises the following steps:

[0037] 1) Raw material selection: The selected raw materials include: hexagonal boron nitride with a particle size of 3 μm, which is chemically pure; silicon dioxide with a particle size of 4 μm, which is analytically pure; aluminum nitrate with a particle size of 5 μm, which is analytically pure; ammonia water is analytically pure Diboron trioxide with a particle size of 2 μm is chemically pure; aluminum nitride with a particle size of 1 μm is chemically pure; silicon nitride with a particle size of 2 μm is chemically pure; titanium boride with a particle size of 4 μm is chemically pure;

[0038] 2) Preparation of precursor slurry: 60% by mass percentage of hexagonal boron nitride powder, 40% of the sum of mass percentages of silicon dioxide and aluminum nitrate is weighed, and control silicon dioxide: aluminum...

Embodiment 3

[0045] 1) Selection of raw materials: The selected raw materials include: hexagonal boron nitride with a particle size of 1 μm, which is chemically pure; silicon dioxide with a particle size of 2 μm, which is analytically pure; aluminum nitrate with a particle size of 2 μm, which is analytically pure; ammonia water is analytically pure Diboron trioxide with a particle size of 2 μm is chemically pure; aluminum nitride with a particle size of 0.5 μm is chemically pure; silicon nitride with a particle size of 1 μm is chemically pure; titanium boride with a particle size of 3 μm is chemically pure ;

[0046] 2) Preparation of precursor slurry: 70% by mass percentage of hexagonal boron nitride powder, 30% of the sum of mass percentages of silicon dioxide and aluminum nitrate is weighed, and control silicon dioxide: aluminum nitrate mol ratio is 1:3, add a certain amount of distilled water and ammonia water as a mixed solvent, so that the pH value of the slurry is 3.5, use an alumin...

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Abstract

The invention discloses a manufacturing method of a mullite-boron nitride composite ceramic side sealing plate for thin-strip continuous casting. The manufacturing method comprises the following steps: (1) preparing precursor slurry, namely mixing hexagonal boron nitride powder, silicon dioxide powder and aluminum nitrate powder, then adding a slurry preparing solvent to prepare slurry, fully mixing the slurry uniformly, standing for a certain period of time, and finally washing and filtering the slurry by using distilled water of 100-130 DEG C to obtain a filter residue namely the precursor slurry; (2) preparing a mixed batch, namely mixing the precursor slurry, silicon nitride powder, aluminum nitride powder, titanium boride powder and diboron trioxide to prepare the mixed batch; (3) pretreating the mixed batch; and (4) performing hot pressed sintering. The side sealing plate prepared by the method disclosed by the invention is very high in strength, compactness and breaking strength, low in thermal conductivity and good in thermal shock resistance, so that the service life of the side sealing plate is prolonged, and the problem of continuous casting interruption is avoided; and moreover, the use stability of the ceramic side sealing plate is improved, the production cost of thin-strip continuous casting is reduced, and considerable economic benefits are achieved.

Description

technical field [0001] The invention relates to a ceramic composite material, in particular to a method for manufacturing a mullite-boron nitride composite ceramic side sealing plate for thin strip continuous casting. Background technique [0002] Thin strip continuous casting is a revolutionary short process in the field of steel strip industrial production. It has fundamentally changed the production process of thin steel in the steel industry. A series of conventional processes such as rolling and related heating and 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 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 ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/185C04B35/5833C04B35/622
Inventor 刘孟宋仪杰周桂峰刘继雄薛改凤徐国涛何明生陈华圣刘黎周旺枝
Owner 武汉钢铁有限公司
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