Chromium carbide ceramic thermal-spraying flux-cored wire

Abstract

The invention provides a chromium carbide ceramic thermal-spraying flux-cored wire. The weight percentages of chemical compositions of the flux-cored wire are that 75 to 85 wt% of Cr2C3, 10 to 15 wt% of NiCr, 1 to 3 wt% of La2O3 and 4 to 7 wt% of graphite; and the powder size is minus 120 to plus 80 meshes. The raw materials are put into an agitator to be evenly mixed, a H08 low-carbon steel belt is adopted by a scarfskin, flux-cored wire production equipment is adopted, and the ceramic flux-cored wire of which the outer diameter is F4 to F6 is formed through curliness and extraction. When the flux-cored wire is used, the spraying distance is controlled within a range of 80 to 120mm and the coating thickness is 0.1 to 0.3mm. The flux-cored wire has the advantages that the cost is low, a large bonding strength reaching 15 to 20MPa exists between a sprayed coating and a low-carbon steel substrate, the sprayed coating has higher hardness reaching 600 to 1000HV within a certain spraying distance range and has higher wear resistance.

Description

technical field [0001] The invention relates to a welding wire, especially a welding wire for thermal spraying. Background technique [0002] Thermal spraying is a method of preparing coatings and has become one of the new technologies for material surface protection and strengthening. It uses a heat source to heat, melt or soften the sprayed materials, and sprays them onto the surface of the substrate at a certain speed to form a coating. Its substrate can be almost all kinds of materials, including inorganic materials such as metal, ceramics, glass, and organic materials such as plastic, wood, paper, cloth, etc., and there is no limit to the size of the workpiece, as large as iron towers, bridges, and as small as mechanical parts. Spray to prepare the coating. Spraying materials can be metal materials, or inorganic non-metallic materials such as ceramics and ceramic-metal composite materials. [0003] At present, ceramic thermal spraying mainly adopts powder spraying, so...

AI Technical Summary

Problems solved by technology

Due to the uneven and unstable powder feeding and uneven melting degree of powder spraying, it is sprayed on the substrate to cause pinching, low coating bonding strength, low heat energy utilization rate, low deposition efficiency, and high porosity

The solid wire used in solid wire spraying needs to be smelted and rolled, the manufacturing process is complicated, and the composition is fixed

Ceramic rod spraying needs to replace the ceramic rod frequently, the work efficiency is low, it is difficult to realize automation, and because the non-melted tip of the ceramic rod is sprayed on the coating surface, the coating quality is affected, and the waste is large

[0004] At present, there is no Cr in China 2 C 3 Ceramic thermal spraying flux-cored wire, there are reports in Russia and France related to the production of ceramic thermal spraying soft wire, not ceramic thermal spraying flux-cored wire