Ivan Dermendjiev’s research while affiliated with Angel Kanchev University of Ruse and other places

In this study different substrates are saturated in vacuum with N, C and O in NH3 and CO2 gas mixture in order to increase their surfaces' properties. The carbon amount (CO2) in the nitriding atmosphere (NH3) was 10 vol. % at a pressure of 8.104 Pa and the process time was 7 h. The pure iron is used as a referent substrate in order to reveal the process potentialities while the other ones are commonly used grades for machine parts manufacturing that undergo abrasive and adhesive wear. The influence of the structural difference on the chemical composition, X-ray diffraction pattern and hardness of the oxynitrocarburized specimens were performed.