Silicon carbide brick and preparation method thereof

Abstract

The invention relates to a silicon carbide brick and a preparation method thereof. According to the silicon carbide brick, silica is used as a main raw material, and is divided into silica powder, silica coarse powder and silica fine powder according to grain diameters. The graphene silicon carbide brick is prepared from silica powder, silica coarse powder, silica fine powder, graphene, composite mineralizer and binding agents including nano-sized chromic oxide and nano-sized titanium oxide. The silicon carbide brick is a graphene silicon carbide brick with excellent thermal shock resistance, strong slag and alkaline metal corrosion resistance, excellent washing resistance, excellent heat-isolation and insulation performance and good high-temperature volume stability; the contact inside the silicon carbide brick is closer due to the graphene, so that the stress generated by expansion when the brick is burnt can be reduced, and the brick is prevented from loosening or cracking; and due to the high strength of the graphene, the excellent mechanical performance of the silicon carbide brick is guaranteed, and the acid and alkali corrosion resistance of the silicon carbide brick can be improved.

Description

technical field [0001] The invention relates to the technical field of refractory materials, in particular to a silicon carbide brick with excellent thermal shock resistance, strong resistance to slag and alkali metal erosion, erosion resistance, excellent heat insulation performance, and good high-temperature volume stability and a preparation method thereof . Background technique [0002] With the increasing shortage of energy, countries pay more and more attention to the development, production and use of energy-saving materials for high-temperature industry. Silica bricks have been widely used and researched in lightweight refractory systems due to their high load softening temperature, good volume stability at high temperatures, and no shrinkage after long-term use. [0003] Due to the large volume expansion caused by the rapid crystal transformation of silica during heating, the firing of silica bricks is more difficult than other refractory materials. The core techn...

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Problems solved by technology

[0008] The purpose of the present invention is to solve the problem that the particle size of iron oxide is not fine enough when the existing silica brick is made, and the dispersion in the silica brick is not uniform enough; calcium oxide is actually added with calcium hydroxide, and its milk of lime solution is easy to flocculate and not easy to disperse. Provide a silicon carbide brick with excellent thermal shock resistance, thermal shock resistance, slag resistance, alkali metal corrosion resistance, erosion resistance, excellent heat insulation performance, and high temperature volume stability