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Nanotechnology can improve the slag resistance of low-carbon magnesium-carbon refractories

[06/28/2021]


Magnesium-carbon refractory material is a kind of furnace lining material mainly used for converters, electric furnaces and ladle. Among them, carbon plays a very important role in smelting molten steel at high temperature. This is because carbon has high thermal conductivity, low coefficient of thermal expansion and low thermal conductivity. The characteristics of low wettability of slag, so as to improve the corrosion resistance of slag, and improve the thermal shock resistance. Traditional magnesia-carbon refractories have high carbon content, resulting in large heat loss during use and easy oxidation, which is not conducive to the production of high-quality steel such as clean steel and special steel, and thus cannot meet their use requirements. Carbonization is the main development trend of magnesia-carbon refractories. However, for low-carbon magnesia-carbon refractories, due to the low carbon content, their slag resistance and thermal shock resistance are deteriorated, and the main forms of damage are slag erosion and cracking or peeling of the surface of the material. Therefore, the research on the preparation of high-performance low-carbon magnesia-carbon refractories using nanotechnology will mainly be carried out from two aspects: slag resistance and thermal shock resistance.

Slag resistance low-carbon magnesia-carbon refractories are mainly composite materials composed of magnesia, graphite, carbon binders, antioxidants and other components. Among them, the use of nanotechnology to strengthen the slag resistance of low-carbon magnesia-carbon bricks is mainly focused on In the two aspects of nano-carbon reinforced matrix structure and nano-catalyst modified carbonaceous binder. In the process of low carbonization of magnesia-carbon refractories, nano-carbon is often introduced as a raw material to improve the slag resistance and thermal shock resistance of the product. The reason is that nano-carbon has the characteristics of large specific surface area, high reactivity and small particle size. Enhance the direct bonding strength between particles. The introduction of nano-carbon can play the following mechanism to strengthen the matrix structure; (1) The shape of nano-carbon particles is closer to spherical. With good fluidity, it can better promote sintering and fill voids to increase the strength of the product, thereby achieving the purpose of improving the slag resistance of the product. (2) Whiskers, fibers or ceramic phases are generated in-situ between nano-carbon and material components, which significantly increases the strength of the product and improves the corrosiveness of the slag to the product.
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