Cored wire for preparing FeCrB coating through electric arc spraying and coating preparation method

Abstract

The invention relates to a cored wire for preparing a FeCrB coating through electric arc spraying and a coating preparation method, belonging to the field of thermal spraying in material processing engineering. Strips for manufacturing skins of wires are stainless steel belts; filling rate of the cored wire is 32-34%; fillers of a core of the cored wire is as follows: chromium metal powder, metallic iron powder and boron carbide powder, wherein the boron carbide powder contains 88 wt% of boron and 12 wt% of carbon; the prepared cored wire contains 18-28 wt% of Cr and 4-10 wt% of B. when the coating is prepared, a surface is processed at first, and then spraying is performed. The coating is featured with strong high-temperature resistance, oxidation resistance and corrosion resistance, high hardness and combination strength, and good mechanical property.

Description

technical field [0001] The invention belongs to the field of thermal spraying in material processing engineering, and is a powder core wire material prepared by using an arc spraying process for FeCrB coating. The invention is mainly used in industrial fields such as wear resistance and high temperature oxidation resistance. Background technique [0002] In the power plant equipment, the boiler plays an important role, and together with the steam turbine and the generator, it is called the "three main engines" of the power plant. At the same time, boilers are also accident-prone equipment in power plants. Most of the unplanned shutdowns of thermal power units are caused by them, and their accidents account for more than 40% of the entire unit, accounting for the majority of all unplanned shutdowns. Among them, the failure of the "four pipes" on the heating surface of the boiler is the primary reason for the forced shutdown of the boiler. With the improvement of design and m...

AI Technical Summary

Problems solved by technology

However, due to the high cost of the Ni-based alloy system, the FeCrAl system is prone to a large amount of interlayer oxidation during the thermal spraying process, resulting in a decrease in the bonding strength, so it is subject to certain restrictions in application.

At present, there is no patent report on the powder core wire material of FeCrB high temperature oxidation corrosion resistant coating prepared by arc spraying

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