Refractory mortar for silicon carbide-carbon composite brick and preparation method

Abstract

The invention relates to a refractory mortar for silicon carbide-carbon composite brick and a preparation method. According to the refractory mortar, silicon carbide particles, fine powder, silicon dioxide micro powder, clay, phenolic resin powder and carbon black are served as raw materials; furan resin and furfuryl alcohol are served as bonding agents; after the phenolic resin powder and the carbon black are added to refractory mortar powder, the mortar has excellent adhering strength after being burnt at a middle temperature and a high temperature. The silicon dioxide micro powder and the clay are synchronously added in the refractory mortar powder, thus, the mortar has high thixotropy and high vibration liquidity. The mixing liquid adopting the furan resin and the furfuryl alcohol is served as a bonding agent, so that shortcomings that a water system bonding agent, a carborundum brick and a carbon brick are poor in wettability, a phenolic resin bonding agent is high in viscosity, and construction is improperly carried out can be avoided. The refractory mortar provided by the invention has the advantages of being high in construction performance, and high in bonding strength after being dried and burnt; and the refractory mortar can be applied to adhering the carborundum brick and the carbon brick to prepare a silicon carbide-carbon composite brick for an aluminium electrolysis groove, and also can be used for bonding carborundum bricks.

Description

technical field [0001] The invention belongs to the technical field of inorganic non-metallic materials, and specifically relates to a refractory mud for silicon carbide-carbon composite bricks and a preparation method thereof. The mud is used to bond silicon carbide bricks and carbon bricks to prepare silicon carbide-carbon composites for aluminum electrolytic cells brick. Background technique [0002] The gradual enlargement of aluminum electrolytic cells requires side masonry materials to have the advantages of high thermal conductivity, high mechanical strength at high temperature, excellent oxidation resistance, thermal shock resistance and corrosion resistance. Silicon nitride bonded silicon carbide bricks have the advantages of high hardness, good wear resistance, high density, high strength, high resistivity, high thermal conductivity, excellent thermal shock resistance, good chemical stability, etc., and have replaced carbon Brick has become the first choice for th...

AI Technical Summary

Problems solved by technology

The disadvantage is that the phenolic resin-based binder itself has a high viscosity, is difficult to apply, and has poor adhesion, resulting in many defects such as pores inside the bonding surface, and it is difficult to ensure the stability of the composite brick quality.

The mud with organic binder basically does not shrink as the temperature rises, and there will be no phenomenon of water-containing binder burning at high temperature and carbon bricks falling off, but as the temperature rises, the resin gradually carbonizes, and a large amount of volatile matter is discharged, forming more in the mud. porosity, thus reducing its bonding performance after high temperature firing