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

2006; Springer Science+Business Media; Volume: 21; Issue: 2 Linguagem: Inglês

10.1007/s11249-006-9032-9

1573-2711

C.S. Abreu, F.J. Oliveira, Manuel Belmonte, A.J.S. Fernandes, J.R. Gomes, R.F. Silva,

Force Microscopy Techniques and Applications

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 (∼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.