Method for preparing periclase-silicon carbide-carbon composite powder through in-situ reaction

Abstract

The invention relates to a method for preparing periclase-silicon carbide-carbon composite powder through in-situ reaction. The method comprises the following steps of: stirring and mixing 40 to 80 weight percent of periclase powder, 5 to 25 weight percent of monatomic silicon powder, 10 to 30 weight percent of graphite and 1 to 10 weight percent of phenolic resin, performing compression moulding, and naturally drying for 24 hours; performing heat treatment at the temperature of between 110 and 300DEG C for 8 to 24 hours, keeping temperature of between 1,000 and 1,700DEG C for 1 to 12 hours in the reducing atmosphere, and naturally cooling; and crushing into powder of which the granularity is less than 10 mu m. The preparation process is simple, and magnesite raw materials are rich; and the prepared periclase-silicon carbide-carbon composite powder has high melt erosion resistance, permeability and thermal shock resistance, can improve the service performance of high temperature materials and has long service life.

Description

technical field [0001] The invention belongs to the technical field of inorganic non-metallic materials. In particular, it relates to a method for preparing periclase-silicon carbide-carbon composite powder by in-situ reaction. [0002] Background technique [0003] Oxide-non-oxide composite materials are an important direction for the development of refractory materials. MgO-C refractory material has become an important refractory material used in the iron and steel industry. It is made of magnesia and graphite with resin as a binder. Because graphite is not wetted by slag and has high thermal conductivity, carbon composite materials have excellent slag resistance and thermal shock stability, and are widely used in the lining of metallurgical furnaces and containers. In the late last century, the service life of refractory materials was greatly improved, and carbon composite refractory materials played an important role. [0004] With the development of pure steel and u...

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Problems solved by technology

[0004] With the development of pure steel and ultra-low carbon steel production, people's ideas have shifted from simply pursuing the long life of refractory materials to considering the impact of refractory materials on steel quality. The existence of carbon has brought some new problems: first, Carburization of molten steel

However, mechanical mixing is difficult to meet the requirements of uniform components and stable properties of the powder