As early as the early 1970s, Beijing Machine Tool Research Institute successfully developed the first 10A ion nitriding test device in China. Since then, research on ion nitriding technology has sprung up all over the country. The relationship between process parameters, structure and properties of the infiltration layer was systematically studied, and the effects of carbon content and alloying elements in the steel as well as the original structure, temperature, time, pressure, and gas medium composition on the structure of the infiltration layer were explored. The conditions for the formation of γ, ε phase, γ’+ε or ε+Fe3C composite phase compound layer and compound-free layer were identified, and the most suitable structure of steel under various service conditions was determined. These conclusions laid a good foundation for the expanded application of ion nitriding. By the end of 1980, there were thousands of ion nitriding equipment and dozens of ion nitriding equipment manufacturing plants across the country, and there was a climax of popularizing ion nitriding technology. Tension spring
In addition to ion nitriding, many scientific research institutions, universities and colleges have also carried out the research and development of ion carburizing, carbonitriding, ion soft nitriding, sulfur nitrogen and carbonitriding sulfur, ion boronizing and other technologies. Factors such as complex technology, high production costs, environmental protection, safety and sanitation have not been widely used, and ion nitriding is the most widely used in production.
The research and application of ion plating technology is also an example of the progress of heat treatment technology in my country. Taiyuan University of Technology, Beijing Union University and the First Research Institute of the Ministry of Electronics have conducted in-depth research on the ion plating mechanism, optimization of process parameters, the relationship between coating quality and process, and developed multi-layer glow ionizing metal and multi-arc ion Plating technology can not only obtain a dense TiN deposition layer on the surface of metal products, and obtain single element plating layers such as W, Mo, Cr, Ni, but also make W, Cr, Mo, V and other elements at the same time in different combinations and proportions. Infiltrate ordinary steel to obtain a relatively thick plating layer similar to high-speed steel on the surface, thereby replacing expensive high-speed steel.