Diffusion welding process for thermal spraying coating of crystallizer copper plate

Abstract

The invention discloses a diffusion welding process for a thermal spraying coating of a crystallizer copper plate. The diffusion welding process comprises the steps of copper plate spraying pretreatment, coating material selection, thermal spraying, diffusion welding of the thermal spraying coating, cooling and discharging. As for the coating material selection, thermal spraying powder comprises 0.3-0.8% of C, 10-20% of Cr, 7-10% of Si, 4-6% of B, 5-10% of Cu, 2-5% of Mo, 1-2% of Al and the balance Ni. The diffusion welding of the thermal spraying coating comprises the steps that inert gas isintroduced into a heat preservation furnace, and diffusion welding treatment is conducted on the coating at a certain temperature within a certain period of time. Metallurgical bonding can be effectively formed between a crystallizer copper plate base body and the thermal spraying coating, the coating is good in performance and has excellent thermal conductivity, abrasion resistance and corrosionresistance, and the service life of the continuous casting crystallizer copper plate is prolonged.

Description

technical field [0001] The invention relates to the field of metallurgical industry, in particular to a diffusion welding process of thermal spray coating on copper plates of continuous casting crystallizers. Background technique [0002] Continuous casting is one of the advanced technologies in the field of modern metallurgical industry, and the copper plate of the continuous casting mold is the core equipment of the continuous casting unit, and its quality directly affects the quality of the billet and the production efficiency of the continuous casting machine. With the development of the continuous casting industry towards high speed and large scale, the requirements for mold copper plates are getting higher and higher: firstly, mold copper plates are required to have good thermal conductivity, which is a prerequisite for improving production efficiency; Strong anti-deformation ability and good wear resistance and corrosion resistance are necessary conditions for extendi...

AI Technical Summary

Problems solved by technology

Among them, using welding technology, the mold copper plate substrate is easily deformed, and the bonding strength between the coating and the substrate is poor; using laser cladding technology, although a metallurgically bonded repair layer can be obtained, the characteristics of the laser cladding method determine that the copper substrate will It is very difficult to prepare a defect-free repair layer on the surface (thermal conductivity and reflectivity); therefore, the method of repairing the side of the copper plate on the short side of the crystallizer by laser cladding has not been industrialized; the use of thermal spraying technology, because of its repair coating The size of the thinner (<1mm) is subject to certain restrictions. At the same time, the repair layer obtained by thermal spraying technology is mechanically bonded to the surface of the copper substrate, which is prone to peeling off during use, and the resulting coating has poor stability. Influence the batch application of thermal spraying technology on the copper plate working surface of continuous casting mold