Method for preparing furnace protection type blast furnace carbon brick through laser cladding

Abstract

The invention provides a method for preparing a furnace protection type blast furnace carbon brick through laser cladding. The method includes the steps that firstly, 400-mesh metallographical abrasive paper is used for polishing the surface of a micropore carbon brick base material to be subjected to cladding, clean water is used for cleaning, and drying is conducted in a drying machine for 2 hours at the temperature ranging from 120 DEG C to 150 DEG C, the formula of a cladding material is composed of TiN and TiC ceramic powder with the volume ratio of 1:1, a roller type powder mixer is used for powder mixing, and the powder mixing time is 8 h to 12 h till powder mixing is even; a synchronous powder sending manner is adopted, the laser cladding material is used for conducting laser cladding on the surface of the micropore carbon brick base material under the argon shield atmosphere with the air pressure ranging from 0.01 MPa to 1 MPa, and after laser cladding is completed, a hard alloy coating on the surface of the micropore carbon brick base material is polished; and finally, cladding of a high-melting-point TiN, TiC and Ti(C and N) mixture protection layer is conducted on the surface of the micropore carbon brick base, the functions of high temperature resistance, corrosion resistance and circulation scouring resistance are achieved in the molten iron long-term contact process, corrosion of molten iron to the carbon brick is inhibited, and the service life of a hearth and a furnace bottom is prolonged.

Description

technical field [0001] The invention belongs to the technical field of refractory materials, and in particular relates to a method for preparing furnace-protecting blast furnace carbon bricks by laser cladding. Background technique [0002] The furnace hearth of the blast furnace cannot be hot repaired due to the storage of hot molten iron, so the life of the carbon brick lining determines the life of one generation of the blast furnace. At present, the age of ordinary blast furnaces is generally about 15 years. Some blast furnaces are overhauled and rebuilt before reaching the age of a generation. What’s more, vicious accidents such as burn-through of the bottom of the furnace have very serious consequences. With the increasing size of modern blast furnaces and the realization of enhanced smelting technology, the cost of overhaul of blast furnaces will increase, and prolonging the life of blast furnaces has become the main goal of ironworks to reduce costs and increase bene...

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Problems solved by technology

However, this method is to add fine powder evenly in the whole carbon brick manufacturing process, and the anti-corrosion effect is worse than that of Ti(C, N).

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