Titanium-diamond-like carbon (Ti-DLC) composite coatings were deposited on 304 SUS substrates by periodic sputtering of Ti in between DLC deposition with different Ti target powers using a magnetron sputtering system. Microstructure as well as the mechanical and tribological properties of the Ti-DLC composite coatings were highly dependent on the Ti target power which was varied from 75 to 150 W. Transmission electron microscopy (TEM) confirmed that the Ti atoms in DLC coatings were in an amorphous state which was beneficial for deterring crack nucleation within the coating. Furthermore, premature delamination of a pure DLC coating with a thickness of ∼330 nm could be prevented by inclusion of Ti in DLC. All the Ti-DLC composite coatings were capable of drastically enhancing the friction and wear properties of bare 304 SUS. The coating deposited with a target power of 85 W showed the highest wear resistance with a wear rate of ∼3.13 × 10 −11 mm 3 /N mm, which was extremely low for a dry sliding condition. This outcome was attributed to ultra-fine distribution of amorphous Ti in DLC which led to low internal stress and high I D /I G ratio of the coating.
Bibliographical noteFunding Information:
This work was supported by the National Research Foundation of Korea (NRF) grant funded by the Korea government (MSIT) (No. 2010-0018289 , No. 2019R1H1A2039657 ) and Brain Korea 21 Plus Project .
© 2019 Elsevier Ltd and Techna Group S.r.l.
All Science Journal Classification (ASJC) codes
- Electronic, Optical and Magnetic Materials
- Ceramics and Composites
- Process Chemistry and Technology
- Surfaces, Coatings and Films
- Materials Chemistry