High-efficient and economical Cr-Al-Si co-cementation technology for steel

Abstract

The invention relates to a technology of carburizing Cr, Al and Si into the surface of steel simultaneously in a high-efficient and economical way so as to improve high-temperature-oxidation-resistance and abrasion-resistance of the steel. The cementation treatment temperature of the technology is between 750 DEG C to 900 DEG C; a cementation agent consists of high-carbon ferro-chrome powder, aluminum powder, iron powder, silicon carbonate, ammonia chloride powder, charcoal powder and the like; reaction of the high-carbon ferro-chrome, the silicon carbonate, the aluminum powder and the like with the ammonia chloride is promoted by utilizing an AC field; high-concentration active chromium atoms, silicon atoms and aluminum atoms are obtained at a condition which is lower than a traditional treatment temperature; the cementation speed of the chromium, aluminum and silicon at a low treatment temperature is effectively through the thermal effect of the AC field and an electromagnetic effect; and the cementation technique is stabilized and the cementation amount of the silicon in a cementation layer is adjusted by adjusting the adding amount of the iron powder. Compared with a traditional Cr-Al-Si co-cementation technology, the technology has the advantages that the treatment temperature is low; cost of raw materials is low; technological material costs can be greatly reduced; the cementation speed can be increased by as high as 6 times; and high-efficient and economical Cr-Al-Si co-cementation is realized.

Description

Technical field: [0001] The invention belongs to the technique of modifying the surface of metal parts, and particularly refers to an energy-saving and efficient method for preparing a chromium-aluminum-silicon composite infiltrated layer for improving the wear resistance, high temperature oxidation resistance and corrosion resistance of the surface of iron and steel parts. Background technique: [0002] The powder method chrome-aluminum-silicon co-infiltration technology is to use the powder infiltration agent to infiltrate the three elements of chromium, aluminum and silicon into the surface layer of the workpiece made of steel materials at the same time to form a chromium-aluminum-silicon ternary co-infiltration layer, which is mainly used to improve the high temperature oxidation resistance of the workpiece and corrosion resistance. [0003] The powder method chrome-aluminum-silicon co-infiltration process generally produces active chromium, aluminum, silicon atoms or ac...

AI Technical Summary

Problems solved by technology

[0004] In the traditional powder method of chrome-aluminum-silicon co-infiltration, active silicon atoms / active silicon-containing groups are mainly provided by ferrosilicon / silicon powder with a high price, which increases the process cost to a large extent; in addition, in the traditional chrome-aluminum-silicon In co-infiltration, the production, diffusion, adsorption and reaction process of active atoms / active groups are all dependent on heating temperature, so the main means to increase the permeation rate is to increase the heating temperature and prolong the heating and holding time, which not only increases energy consumption, but also Excessive heating temperature and long-term heating and heat preservation will also reduce the mechanical properties of most processed workpiece substrates

However, in the general electric field powder method of chromium-aluminum-silicon co-infiltration using traditional co-infiltration agents, there are still problems such as unstable electric field parameters during the infiltration and expansion process, difficult control, and difficulty in controlling the thickness and composition of the co-infiltration layer.