A large-scale self-bonded silicon carbide product by casting

Abstract

The invention relates to a large casting-molding self-combined silicon carbide product. The method comprises the following steps: taking silicon carbon particulates and fine powder, silicon carbon powder, silica powder, silicon powder, carbon black, molybdenum disilicide micro powder, active magnesium oxide and a water reducer as powder; by taking ludox as a binding agent, molding by adopting a vibrating casting manner; sintering the molded green body under a protective atmosphere after conserving and baking, wherein the highest sintering temperature is 1300-1500 DEG C; sintering and cooling to room temperature along with a furnace, so as to prepare the self-combined silicon carbide product. The large and profile self-combined silicon carbide product can be prepared, and has the advantages that the size and the shape of the product are not limited, performance is excellent, and the like, and the prepared self-combined silicon carbide product can be applied to the fields such as a blast-furnace tuyere and a cooling wall tile in the iron and steel industry and an aluminum electrolytic cell in the non-ferrous industry.

Description

technical field [0001] The invention belongs to the technical field of inorganic non-metallic materials. It specifically relates to a pouring-molded large-scale self-bonded silicon carbide product, which can prepare large-scale or special-shaped self-bonded silicon carbide products. The prepared silicon carbide product can be applied to blast furnace tuyere and cooling wall inlaid bricks in the iron and steel industry, aluminum electrolytic cells in the non-ferrous industry, and other fields. Background technique [0002] Silicon carbide refractories have high high temperature strength, high thermal conductivity, low thermal expansion coefficient, good thermal shock resistance, good alkali corrosion resistance, strong resistance to slag and zinc, aluminum, copper, lead and other melt erosion, and high temperature wear resistance. It has a very broad application prospect in iron and steel smelting, non-ferrous metal smelting, and ceramics industry. The bonding methods of sil...

AI Technical Summary

Problems solved by technology

3) Self-bonded silicon carbide products must contain a certain amount of carbon sources after molding. Carbon sources such as flake graphite and coke are poorly wetted by water. After adding, the fluidity of the material will deteriorate during casting and the water demand will increase significantly, which will reduce the material performance.

4) The amount of silicon powder and carbonaceous raw materials added to the material determines the amount of in-situ silicon carbide generated in self-bonded silicon carbide products. Increasing the amount of in-situ silicon carbide generated can improve the performance of self-bonded silicon carbide products, but the amount of in-situ silicon carbide It is not that the more the better, this is because the addition of too much carbonaceous raw material greatly reduces the bulk density of the material, and the in-situ silicon carbide reinforcement cannot compensate for the adverse effects of the reduction in material density, which is not conducive to the improvement of material performance