CVD diamond coated silicon nitride self-mated systems: tribological behaviour under high loads

resumo

Friction and wear behaviour of self-mated chemical vapour deposited (CVD) diamond films coating silicon nitride ceramics (Si3N4) were investigated in ambient atmosphere. The tribological tests were conducted in a reciprocal motion ball-on-flat type tribometer under applied normal loads up to 80 N (similar to 10 GPa). Several characterisation techniques-including scanning electron microscopy (SEM), atomic force microscopy (AFM) and micro-Raman studies-were used in order to assess the quality, stress state and wear resistance of the coatings. In addition, a novel method is presented to estimate the wear coefficient of the diamond coated flat specimens from AFM and optical microscopy (OM) observations of the wear tracks.

palavras-chave

CHEMICAL-VAPOR-DEPOSITION; RAMAN-SPECTROSCOPY; RESIDUAL-STRESS; TI-6AL-4V ALLOY; CARBON-FILMS; COATINGS; FRICTION; POLYCRYSTALLINE; PERFORMANCE

categoria

Engineering

autores

Abreu, CS; Oliveira, FJ; Belmonte, M; Fernandes, AJS; Gomes, JR; Silva, RF

nossos autores

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