Max phase-boron nitride composite ceramic side seal plate for thin-strip casting and manufacturing method of Max phase-boron nitride composite ceramic side seal plate

A technology of composite ceramics and boron nitride, which is applied in the field of ceramic composite materials, can solve the problems of restricting the industrialization process of thin strip continuous casting, failing to meet the requirements of industrial production, poor service life and wear resistance, and achieve high density, The effect of improving the service life and prolonging the service life

Active Publication Date: 2015-09-02
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

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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  • Max phase-boron nitride composite ceramic side seal plate for thin-strip casting and manufacturing method of Max phase-boron nitride composite ceramic side seal plate
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Embodiment 1

[0030] A Max phase-boron nitride composite ceramic side sealing plate for thin strip continuous casting and a preparation method thereof, comprising the following steps:

[0031]1) The preparation of Max phase (ternary compound) powder, its preparation process comprises following three steps:

[0032] ① Raw material selection: select Ti powder with a chemical purity and a particle size of 20 μm; Al powder with a chemical purity and a particle size of 10 μm; activated carbon powder with a chemical purity and a particle size of 10 μm;

[0033] ②Max phase sintered body preparation: first according to Ti 2 AlC(M 2 AX phase) stoichiometry (ie: by Ti 2 In the chemical formula of AlC, the molar ratio of Ti:Al:C is 2:1:1) Select Ti powder, Al powder and activated carbon powder for batching, and then use planetary ball mill to mix the batch materials, and the mixed solvent is absolute ethanol or acetone, the mixing time is 5 hours, and then the mixture is dried in a blast drying ove...

Embodiment 2

[0042] A Max phase-boron nitride composite ceramic side sealing plate for thin strip continuous casting and a preparation method thereof, comprising the following steps:

[0043] 1) The preparation of Max phase (ternary compound) powder, its preparation process comprises following three steps:

[0044] ① Raw material selection: select Ti powder with chemical purity and particle size of 30 μm; Al powder with chemical purity and particle size of 20 μm; activated carbon powder with chemical purity and particle size of 5 μm.

[0045] ②Max phase sintered body preparation: first according to Ti 3 AlC 2 (M 3 AX 2 The stoichiometry of phase) selects Ti powder, Al powder and active carbon powder to carry out batching, utilizes planetary ball mill to mix batch material then, mixed solvent is absolute ethanol or acetone, and mixing time is 7h, utilizes blast type drying oven to mix again. The mixture is dried, and finally the dried powder is sintered by hot-pressing sintering method....

Embodiment 3

[0054] A Max phase-boron nitride composite ceramic side sealing plate for thin strip continuous casting and a preparation method thereof, comprising the following steps:

[0055] 1) The preparation of Max phase (ternary compound) powder, its preparation process comprises following three steps:

[0056] ① Raw material selection: select Ti powder with a chemical purity and a particle size of 25 μm; Al powder with a chemical purity and a particle size of 30 μm; activated carbon powder with a chemical purity and a particle size of 15 μm; silicon carbide (SiC) powder , the purity is chemically pure, and the particle size is about 35 μm;

[0057] ②Max phase sintered body preparation: first according to Ti 3 SiC 2 (M 3 AX 2 Phase) stoichiometry Select Ti powder, Al powder, activated carbon powder and SiC powder for batching, and then use planetary ball mill to mix the batch materials, the mixing medium is absolute ethanol, and the mixing time is 10h, and then use the blast drying...

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Abstract

The invention discloses a Max phase-boron nitride composite ceramic side seal plate for thin-strip casting and a manufacturing method of the Max phase-boron nitride composite ceramic side seal plate. The side seal plate comprises the following components in percentage by mass: 40-70% of h-BN powder, 10-30% of Max phase powder, 5-20% of AlN powder, 5-20% of AlB2 powder and 0.5-5% of Al2O3 powder. The manufacturing method comprises the following steps: 1) preparing Max phase powder; 2) preparing mixed slurry: namely mixing the h-BN powder, the Max phase powder, the AlN powder, the AlB2 powder and the Al2O3 powder in percentage by mass and then adding a mixed solvent to mix and fully and uniformly mixing the mixture to obtain mixed slurry; 3) preparing mixed powder; and 4) sintering the mixed powder. According to the method disclosed by the invention, the ceramic side seal plate for double roll thin-strip casting is manufactured by using a ceramic formula. The prepared side seal plate has the characteristics of being high in compactness and high in rupture strength. The compactness is 93-98%, the rupture strength at the room temperature reaches 300-500MPa, the strength of the side seal plate in the using process is fully guaranteed, and the side seal plate is not hardened.

Description

technical field [0001] The invention relates to a ceramic composite material, in particular to a Max phase-boron nitride composite ceramic side sealing plate for thin strip continuous casting and a manufacturing method thereof. 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 p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/66C04B35/583C04B35/622
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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