A kind of low-carbon magnesia-alumina-carbon brick bonded with ceramics at high temperature and preparation method thereof

Abstract

The invention discloses a low carbon magnesia-alumina-carbon brick combining ceramics at a high temperature and a preparation method thereof. The preparation method comprises the following steps: uniformly mixing raw materials in the low-carbon magnesia-alumina-carbon brick, pressing to form a green body, and then baking the green body for 6 to 12 hours at 150 to 220 DEG C. The low carbon magnesia-alumina-carbon brick is prepared from the following raw materials in parts by weight: 40 to 50 parts of fused magnesite particles, 10 to 25 parts of fused magnesite fine powder, 10 to 25 parts of high-alumina bauxite particles, 5 to 15 parts of corundum fine powder, 2 to 4 parts of zirconite particles, 4 to 8 parts of zirconite fine powder, 2 to 4 parts of crystalline flake graphite, 1 to 2 parts of metal Al fibers, 1 to 2 parts of elementary substance Si fibers and 2 to 4 parts of binding agents. Compared with the traditional carbon-combined low carbon magnesia-alumina-carbon brick, the low carbon magnesia-alumina-carbon brick is excellent in medium-high-temperature strength, thermal shock resistance and oxidation resistance.

Description

technical field [0001] The invention relates to the technical field of refractory materials, in particular to a ceramic-bonded low-carbon magnesium-aluminum-carbon brick at high temperature and a preparation method thereof. Background technique [0002] With the continuous improvement of human living standards, higher requirements are placed on the quality of traditional stainless steel. As we all know, carbon is one of the most harmful impurity elements in stainless steel, and its content is required to be as low as possible in the molten steel refining process, such as high-purity ferrite and other stainless steels, where the carbon content is generally required to be below 80ppm, and sometimes even below 50ppm . [0003] Carbon-containing refractory materials with a C content greater than 10% are widely used in the bottom of the electric furnace mother liquor ladle, refining ladle, and molten pool used in the traditional stainless steel smelting process, such as magnesia...

AI Technical Summary

Problems solved by technology

However, this method still has problems such as high cost, difficult dispersion, high reactivity, easy oxidation and structural alteration of graphene.

[0009] To sum up, in order to solve the problem of adding carbon to molten steel caused by the high carbon content of magnesia-alumina-carbon bricks and magnesia-carbon bricks used in the molten pool of the refining ladle in the current stainless steel smelting process, the existing technology adopts micro-nano structure carbon Sources, such as micro-nano-scale graphite flakes, nano-carbon black, carbon nanotubes and graphene, etc., have prepared low-carbon refractory materials that are nano-carbon-bonded at room temperature and at medium and high temperatures, but there are relatively high costs in the production and use process. High, difficult to disperse, and the nano-carbon source has high reactivity during high-temperature use, and is prone to oxidation and structural alteration.

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