Slide gate nozzle brick utilized in metallurgic cast and prepn. thereof

Abstract

A sliding sprue brick for metallurgical casing features that at least its surficial working layer is prepared from high-Al2O3 refractory aggragate (75-98 wt.%) and metallic microparticles (2-25 wt% whose smelting point is less than 1000 deg.C through mixing and calcining at 400-1300 deg.C in neutral or reductive atmosphere. Its advantages are high resistance to oxidization, corrosion, heat shock and high-temp water, and high strength.

Description

technical field

[0001] The invention relates to the improvement of the composition and preparation method of sliding nozzle bricks for metallurgical casting (molten steel casting). Background technique

[0002] At present, sliding nozzle bricks (upper and lower nozzles, upper and lower sliding plate bricks) for metallurgical casting are commonly used in four major types of materials, such as aluminum carbon, aluminum zirconium carbon, magnesia, and corundum. With the development of steelmaking technology, the requirements for sliding nozzle bricks are increasing. , especially higher requirements for thermal shock resistance, corrosion resistance, high temperature structural strength and high temperature wear resistance. However, although aluminum-carbon and aluminum-zirconium carbon sliding nozzle bricks have the characteristics of good thermal shock resistance and high strength, they have the disadvantage of being easily oxidized. When sliding bricks are used in multiple fu...

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