Effects of WC phase contents on the microstructure, mechanical properties and tribological behaviors of WC/a-C superlattice coatings

- WC/a-C superlattice coatings were synthesized with various WC phase content.
- Superlattice structure diminished residual stress and densified microstructure.
- Nanocomposite coating with W 5.43 at.% achieved the optimal tribological properties.
- Friction triggered WO3 lead to a low friction coefficient at 200 °C.