Manufacturing method of metal ceramic coating crystallizer copper plate

Abstract

The invention provides a manufacturing method of metal ceramic coating crystallizer copper plate, belonging to the technical field of continuous casting crystallizer. The invention comprises the following steps: firstly pretreating the surface of the base material; carrying out purifying treatment on the surface of to-be-sprayed workpieces with acetone; carrying out sand spraying and roughening process with 20 meshes of brown aluminium oxide; then adopting the supersonic flame spraying method to spray Cr3C2-25NiCr metal ceramic coating on the surface of a copper crystallizer, coating a layer of brazing filler metal with low melting point mixed with metal ceramics on the metal ceramic coating; finally carrying out remelting treatment in a vacuum furnace, preserving heat for 0.5-2 hours at the temperature of 600 DEG C to 700 DEG C, and cooling to the room temperature by blowing high-pressured nitrogen. The invention has the advantages of ensuring the bonding intensity between the metal ceramic coating and the substrate, lowering the porosity of the coating, and improving the cohesion strength of the coating; the invention further has the advantages of even and compact coating, flat surface, realization of metallurgical bonding with the substrate, good properties of high temperature abrasion resistance and corrosion resistance, and good cold fatigue and hot fatigue resistance properties; the coating can bear the high temperature abrasion of the casting blank surface and the casting blank has lower friction coefficient, thus being beneficial for improving the quality of the casting blank surface and improving the speed of jolleying.

Description

technical field [0001] The invention belongs to the technical field of continuous casting crystallizers, in particular to a method for manufacturing a copper plate of a cermet coating crystallizer. Background technique [0002] Mold is the core component in continuous casting production. On the current high-operating rate and high pouring speed continuous casting machine, high-temperature wear, thermal cracks, and thermal deformation have become the main reasons for the replacement of mold copper plates. In recent years, the use of electroplating to treat the surface of the mold has greatly improved the wear resistance and corrosion resistance of the mold, improved the quality and productivity of the slab, saved costs, and extended the service life of the mold, but at present There are certain deficiencies and defects in various coatings. Such as the coating is too thin, easy to fall off, poor wear resistance, corrosion resistance, complicated process, serious pollution, et...

AI Technical Summary

Problems solved by technology

In recent years, the use of electroplating to treat the surface of the mold has greatly improved the wear resistance and corrosion resistance of the mold, improved the quality and productivity of the slab, saved costs, and extended the service life of the mold, but at present The various coatings have certain deficiencies and defects to varying degrees.

Such as the coating is too thin, easy to fall off, wear-resistant, poor corrosion resistance, complicated process, serious pollution, etc.

Invention patent CN 101302619A announced the "supersonic spraying method for mold copper plate". Using thermal spraying technology, a high-hardness wear-resistant and corrosion-resistant nickel-based coating was obtained on the surface of the mold Cu substrate, but subsequent melting heat treatment was required to increase the coating and The strength of the matrix bond, the heat treatment temperature is 800°C-950°C, above the recrystallization temperature of copper, has a direct impact on the deformation of the copper plate of the crystallizer, reduces the hardness of the copper matrix, and increases the difficulty of subsequent orthopedic treatment