Metal ceramic coating on surface of copper plate of continuous casting mold and manufacturing process for metal ceramic coating

Abstract

The invention discloses a metal ceramic coating on surface of a copper plate of a continuous casting mold. The metal ceramic coating is a coating obtained by performing hypersonic flame spraying on cobalt coated tungsten carbide WC-12Co powder and has the thickness of 0.2 to 0.6mm. Correspondingly, the invention also provides a process for manufacturing the metal ceramic coating on the surface of the copper plate of the continuous casting mold. The process comprises the following steps of: cleaning the surface of the copper plate of the continuous casting mold; performing shot blasting treatment on the surface of the copper plate of the continuous casting mold; spraying the cobalt coated tungsten carbide WC-12Co powder on the surface of the copper plate of the continuous casting mold by employing a hypersonic flame spraying process, wherein the hypersonic flame spraying process has the parameters of the oxygen flow of 700 to 1,000L per minute, the kerosene flow of 5.0 to 6.0 gph, the spraying distance of 300 to 400mm and the coating thickness of 0.2 to 0.6mm. The metal ceramic coating is low in porosity and high in microhardness, the adhesive strength between the coating and a matrix is high, and the wear resistance and corrosion resistance of the mold are obviously improved.

Description

technical field [0001] The invention relates to a surface treatment technology, in particular to a metal surface coating and a preparation process thereof. Background technique [0002] In continuous casting production, the crystallizer is the heart of the continuous casting machine. The copper plate of the mold is an important heat transfer component for continuous casting to solidify from molten steel into a solid billet shell. Its technical performance will directly affect the surface quality of the billet, continuous casting The casting speed of the machine, the continuous casting operation rate and other indicators. During the use of the mold, there are mainly problems such as edge wear, wide surface thermal cracks, narrow surface shrinkage, and surface corrosion. Surface treatment of the base material is a necessary condition for continuous casting production. [0003] The surface of the copper plate of the existing crystallizer mainly uses thermal spraying NiCr coati...

AI Technical Summary

Problems solved by technology

If the heat conduction inside the crystallizer is too fast, the temperature gradient at the solidification front of the continuous casting slab will be too large, so that the tendency to form columnar crystals in the solidification structure and the growth of columnar crystals will increase significantly, which is not conducive to the formation of equiaxed crystals; especially in the crystallizer At the meniscus, the thermal conductivity is good, and the heat dissipation is too fast, resulting in uneven thickness of the born billet shell, which is prone to cracks

Images