A method for aluminizing a circular link chain

Abstract

The invention provides an aluminizing method of a circular ring chain, which can form an ultra-thick iron-aluminum compound layer under a high-temperature environment within relatively short time. Thealuminizing method comprises the following steps: firstly, carrying out hot dip aluminum plating on the circular ring chain to form an aluminum layer and an iron-aluminum intermetallic compound layeron the surface in sequence from outside to inside; carrying out thermal diffusion protection: mixing a sodium silicate solution with the mass percent to 5 to 35 percent and silicon dioxide powder toprepare protection slurry; immersing the circular ring chain with a hot dip aluminum plated layer on the surface into the protection slurry; after one protection slurry film layer is hung on the surface, taking out and airing; carrying out thermal diffusion treatment: putting the circular ring chain which is hung with the protection slurry film layer and is aired into a high-temperature diffusionfurnace and carrying out thermal diffusion at 750 to 950 DEG C for 40 to 180min to form an Fe-Al layer, wherein an Fe-Al phase layer and an Fe3Al phase layer are arranged in sequence from outside to inside; quenching and tempering: increasing the temperature of the circular ring chain to phase change temperature of an Fe substrate by adopting a power frequency heating manner; then carrying out water quenching and hardening and carrying out low-temperature tempering at 400 DEG C.

Description

technical field [0001] The invention relates to the technical field of aluminized steel heat treatment, in particular to an aluminizing method for a circular link chain capable of forming an ultra-thick iron-aluminum compound layer on the surface of a circular link chain within a relatively short period of time in a high-temperature environment and effectively improving the comprehensive performance of the circular link chain. Background technique [0002] As a traction chain, circular link chains are widely used in coal mine underground working machines such as scraper conveyors, coal plows, and drum shearers. my country has become a major producer and consumer of circular link chains. Due to the harsh environment in coal mines, the circular link chain has become a vulnerable part. During use, the circular link chain is subjected to both tension and impact loads, and the top of the circular link chain is worn and contact fatigued when the links in the circular link chain ar...

AI Technical Summary

Problems solved by technology

[0004] However, the current thermal diffusion treatment of the hot-dip aluminum coating still has its limitations. The main problems are: first, the treatment temperature should not be too high, generally controlled at 700-850°C, to prevent the aluminum-rich layer on the surface from approaching the sublimation of aluminum After the temperature is high, the aluminum element will evaporate directly, reducing the aluminum concentration on the surface of the substrate, which is not conducive to the interdiffusion of intermetallic atoms

Third, in order to prevent the surface aluminum atoms from heating and evaporating, the Fe-Al layer combines with oxygen to form a crackable iron oxide layer, which affects the normal use of the product. It is usually necessary to put the material to be processed into a high vacuum furnace for heat treatment, thus It has greatly affected the cost and benefit of industrialized large-scale production, and it is difficult to realize industrialized application, which is an urgent problem to be solved in this field

Images