Properties of Tungsten and Boron doped ta-C films
(Room Room 104-B)
29 Apr 19
10:40 AM
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11:00 AM
Tracks:
Protective, Tribological and Decorative Coatings
Hydrogenated Diamond Like Carbon has been spread widely in the industry and applied as a coating to increase wear resistance and reduce friction losses. Non-hydrogenated DLC is now in the focus of many industries due to its better temperature stability and higher hardness. Extensive research has been done in the past whereby the effect of incident energy, angle of incidence, substrate temperature and deposition rate where studied. We have shown in earlier presentations that we can modulate the sp2-sp3 content in the film at nanoscale if the right conditions are chosen. In the experiments reported here we have prepared Hydrogen-free DLC coatings from pure and from doped graphite targets by means of pulsed Arc evaporation. Further systematic experiments have been carried out to understand the sp2-sp3 modulation and to be able to control it in normal production. To influence the properties of the deposited tetrahedral amorphous films, it was doped with other elements. Two elements were chosen, Boron and Tungsten. The Boron and Tungsten contents were varied between 0.5 and 4 %. The experimental results show that the film hardness is influenced negatively by the dopants. Non-linear effects have been observed on hardness versus dopant content.