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The surface hardness of aluminium has been improved by a factor of about 20 by covering the surface with a titanium layer of about 100 nm and by implanting nitrogen ions (N(+)) of 50 keV, at different fluences. Surface analyses by means of the ESCA method show that up to 30 nm from the surface of the titanium layer, carbon and oxygen are present and that their concentrations decrease with increasing distance from the surface. On the other hand those of titanium and nitrogen increase. By means of RBS spectra the surface concentrations of titanium and nitrogen could be determined and, in some cases, the ratio N/Ti could be obtained, as well as the thickness of the remained Ti-layers. The nanohardness (NH) of an aluminium substrate used in these experiments was 2.2 GPa at 10 nm depth and 0.8 GPa at 100 nm depth. After the implantation of the Ti-layer with N(+) the NH values were (in GPa) about 20 at 10 nm depth, about 40 at 30 nm depth, and 6-15 at 100 nm depth.

Additional information

Authors: GAUTSCH O, JRC Petten (NL);MANARA A, JRC Petten (NL)
Bibliographic Reference: EUR 14784 EN (1992) 14 pp., FS, free of charge
Availability: Available from Joint Research Centre, Publication Department, I-21020 Ispra (Va.) (IT)
Record Number: 199511021 / Last updated on: 1995-08-18
Original language: en
Available languages: en