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Preparation method of ferrosilicon nitride porous ceramic sliding plate

A technology of ferrosilicon nitride and porous ceramics is applied in the field of inorganic non-metallic materials to avoid pollution, improve thermal shock resistance and save raw materials

Active Publication Date: 2015-07-01
UNIV OF SCI & TECH BEIJING
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Problems solved by technology

Metal-ceramic material composite corundum slide is still in the research stage

Method used

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Embodiment Construction

[0012] 1 Using iron-silicon 75 alloy powder as raw material, it is nitrided and burned in a flash nitriding furnace to obtain a raw body of ferrosilicon nitride ceramics, the main phase of which is Fe 3 Si and Si 3 N 4 , Fe 3 The mass fraction of Si is 20%-30%, and the mass fraction of silicon nitride is 70%-80%. Its apparent porosity is 20%-40%; bulk density is 2.4-2.7g / cm 3 ; The compressive strength at room temperature is greater than 90MPa.

[0013] 2 Cut the original body of ferrosilicon nitride according to the actual production demand shape to get the inner core of the slide plate, that is, the part where the molten steel flows in the middle of the slide plate.

[0014] 3. Taking the inner core of silicon nitride as the center, the outer part is casted with unshaped refractory material, and the shape and size of the sliding plate required by the actual production are obtained to obtain the porous ceramic sliding plate body of iron silicon nitride.

[0015] 4. Hoopi...

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Abstract

The invention belongs to the field of inorganic nonmetallic materials, and relates to a preparation method of a sliding plate for a steel-making ladle sliding gate mechanism, in particular to a preparation method of a ferrosilicon nitride porous ceramic sliding plate. The ferrosilicon nitride porous ceramic sliding plate disclosed by the invention is characterized in that the inner core of the sliding plate is prepared by directly cutting an original ferrosilicon nitride blank body; and the periphery of the sliding plate is poured and formed by adopting an unshaped fire-resistant material. The ferrosilicon nitride sliding plate is a carbon-free sliding plate; therefore, molten steel carburetion of the sliding plate generated in the use process can be avoided; the production requirements of clean steel in the future can be satisfied; the chrome-free property of the sliding plate is realized; pollution of chrome to the environment is avoided; the processing technology is simple; sintering and heat treatment are unnecessary; raw materials, energy, equipment, manpower and time are saved greatly; the cost is low; the preparation method is applied to large-scale industrial popularization; the porous ceramic material is applied in the sliding plate, so that the basic performances of the sliding plate are ensured, and simultaneously, the thermal shock resistance of the sliding plate is increased; the porous ceramic is applied in the sliding plate disclosed by the invention for the first time, so that a new field is created for developing the sliding plate material, and the development direction shows a promising future.

Description

technical field [0001] The invention belongs to the field of inorganic non-metallic materials, and relates to a preparation method of a slide plate for a sliding nozzle mechanism of a steelmaking ladle, in particular to a preparation method of a silicon nitride porous ceramic slide plate. Background technique [0002] Sliding plates are used in ladles and tundishes, and mainly play the role of adjusting the flow rate of molten steel. The pouring of molten steel at a temperature of 1550°C or higher requires sufficient strength on the sliding plate to withstand the static pressure of the molten steel. Secondly, the smoothness of the sliding surface of the upper and lower plates is required to ensure tight contact and no leakage during the pouring process. Steel, but also have good thermal stability, erosion resistance, and corrosion resistance, so as to be able to withstand rapid changes in temperature, erosion of molten steel, and erosion of slag. The production of tradition...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/66
Inventor 李勇秦海霞白立雄
Owner UNIV OF SCI & TECH BEIJING
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