Preparation method of mold bottom brick for high-temperature alloy steel ingot mold

Abstract

The invention belongs to the technical field of refractory materials, and particularly relates to a preparation method of a mold bottom brick for a high-temperature alloy steel ingot mold. The mold bottom brick is uniformly coated with a coating with the thickness of 0.5-1 mm. The preparation method of the mold bottom brick comprises the following steps: (1) preparing the mold bottom brick and a coating smeared on the mold bottom brick; and (2) uniformly smearing the prepared coating on the use surface of the mold bottom brick, putting the mold bottom brick coated with the coating in a heatingfurnace with the use surface facing upwards for baking, and conducting drying to obtain a finished mold bottom brick. The mold bottom brick is prepared from fine powder particles through hot pressing, and is high in impact resistance and good in hot corrosion resistance; and the coating is prepared from powder particles with the particle size smaller than 1 micron, a coating layer is smoother andmore compact, and due to the use of the coating layer, the mold bottom brick is more resistant to molten steel impact, refractory materials are not prone to being scoured by molten steel, and brick sticking is not prone to happening in the demolding process. Compared with a traditional mold bottom brick, the strength of the prepared mold bottom brick is greatly improved, and the cleanliness of cast high-temperature alloy is higher.

Description

technical field [0001] The invention belongs to the technical field of refractory materials, and in particular relates to a method for preparing a mold bottom brick for a high-temperature alloy steel ingot mold. Background technique [0002] Superalloys refer to a class of alloys that can work for a long time under the environment of high temperature above 600 ℃ and certain stress. Superalloys are widely used in aero-engines, automobile engines, gas turbines, nuclear power, petrochemical and other fields due to their excellent oxidation resistance and thermal corrosion resistance. my country is currently vigorously developing the aerospace industry, striving to independently develop internationally advanced aerospace engines. my country's demand for high-end superalloys will gradually increase. In order to improve the quality of superalloy products and optimize various performance indicators of superalloy materials, many metallurgists have made a lot of efforts. As a comp...

AI Technical Summary

Problems solved by technology

At present, the surface layer of traditional mold bottom bricks is easy to be washed, and the refractory material under the washing will enter the molten steel, causing pollution to the molten steel, and brick sticking will also occur during demoulding, which will cause trouble for the subsequent processing of steel ingots

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