Method for preparing intermetallic compound powder cored filament material for electric arc spraying

Abstract

The preparation process of intermetallic compound filament with powder core for arc spraying includes the following steps: mixing aluminum powder of granularity 38-44 micron and purity not lower than 99.5 % and iron (nickel ) powder of granularity 53-61 micron and purity not lower than 99.5 % in the atom ratio of 1 to 1; pressing the mixture in a hydraulic press into blank and painting the surface with one thin graphite layer; self-spreading reaction in a vacuum combustor to obtain loose intermetallic compound block; crushing, grinding, sieving to obtain 200-325 mesh granularity powder material and drying; and making Fe (Ni)-Al compound filament with powder core. The present invention has good spraying performance, good coating layer performance, high performance / cost ratio, wide use temperature range, simple technological process and low power consumption.

Description

technical field

[0001] The invention belongs to a preparation method of an intermetallic compound powder core wire material for electric arc spraying. technical background

[0002] Arc spraying technology is widely used in the field of high temperature corrosion and protection of materials, and is widely used in electric power, coal, metallurgy and other fields. For example, the "four tubes" in power plant boilers, that is, superheater tubes, reheater tubes, economizer tubes and water wall tubes, are subject to erosion, wear and corrosion of hard particles and corrosive media, resulting in tube failure and shutdown. The problem is one of the main hidden dangers in the production of power plants. The use of arc spraying technology to obtain high-performance coatings has become one of the main means to solve the above problems.

[0003] In the selection of spraying materials, for the general anti-corrosion and anti-wear requirements of equipment and structural parts, wire ma...