Magnesia chrome carbon coating and preparation method thereof

Abstract

The invention pertains to the technical field of non-metal refractory materials, which relates to a magnesia chrome carbon coating and a preparation method thereof. The magnesia chrome carbon coating is researched and developed by taking waste magnesia carbon bricks as raw materials. The proportioning ratio of the waste magnesia carbon bricks is more than 65 percent, thereby increasing the recycling quantity of the waste magnesia carbon bricks and lowering the production cost of the magnesia chrome carbon coating. The magnesia chrome carbon coating can be used as the coating of continuous casting tundish working lining and as the patching material of the lower groove working lining of an RH vacuum furnace. The magnesia chrome carbon coating made from the components can bear the erosion and scouring of high-temperature molten steel (1550 DEG C to 1650 DEG C) for more than 24 hours and has good resistance to erosion, scouring and oxidation.

Description

technical field [0001] The invention relates to a magnesium-chromium carbonaceous smear and a preparation method thereof, belonging to the technical field of non-metallic refractory materials. Background technique [0002] Using waste magnesia-carbon bricks as raw materials, the magnesia-chromium-carbon smear material developed is used for the working lining of continuous casting machine tundish, which is one of the important technologies for recycling waste magnesia-carbon bricks. However, the main defects in the production practice of the magnesia-carbon smear prepared by the traditional process formula are: (1) The smear has poor corrosion resistance, and the service life of the tundish lining is low, such as in billets and rectangular billets. For small and medium-sized continuous casting tundishes, the maximum service life is generally about 20 hours; while for large continuous casting tundishes such as slabs and near-net shape billets, the service life is generally abo...

AI Technical Summary

Problems solved by technology

However, the magnesia-carbon smear prepared by the traditional process formula has the main defects in production practice: (1) The smear has poor corrosion resistance and the service life of the tundish lining is low, such as in billets and rectangular billets. For small and medium-sized continuous casting tundishes, the maximum service life is generally about 20 hours; while for large continuous casting tundishes such as slabs and near-net shape billets, the service life is generally about 16 hours; (2) the traditional waste In the magnesia carbon brick recycling technology, the amount of waste magnesia carbon bricks added is less, generally 10~30%

The disadvantage of the above technology is that the waste magnesia-carbon bricks are decarbonized, which loses the original excellent properties of magnesia-carbon refractory materials such as slag resistance and thermal shock resistance, and increases the processing cost.