The samples for this analysis are hard steel machine elements. They have been treated with boron as an additive of the lubricant during part of the contact process in a tribological test rig, in order to create wear resistant surfaces. After the tribological procedure the surfaces are examined for their in-depth concentration profiles of oxygen, carbon, sulphur, iron and boron. This analysis is done with SIMS, using positively charged O2 and Cs ion beams for erosion, and controlled 11B implantation in the base material for calibration of sputter depth and boron concentration. For the present samples the native surface oxide concentration profile is found to enhance the signals considerably at the beginning of the SIMS measurements. This effect is discussed and tentatively corrected for through the observed 12C profiles. Comparison with TRIM-simulated profiles for the implanted samples shows that the suggested correction procedure clearly improves the results for the boron profiles. It therefore becomes possible to quantify the shallow boron concentration profiles and to relate them to the tribological properties of the surfaces.
|Tidsskrift||Surface and Interface Analysis|
|Status||Udgivet - 1. jan. 1996|