Abstract
To improve the bonding strength of diamond-like carbon film (DLC) on Ti6Al4V alloy (TA) substrate, the effect of texturing, carburizing and their combination was investigated. The different surface treatments were carried out on the Ti6Al4V substrate surface by laser texturing and carburizing before the deposition of DLC coatings. Thus, three different DLC coated samples were prepared: 1. DLC coatings with a laser textured substrate, named TDLC; 2. DLC coatings with a laser carburized substrate, named CDLC; 3. DLC coatings with a hybrid laser textured and carburized substrate, named TCDLC. Meanwhile, the only mechanical polished DLC coatings (ODLC) were also prepared for comparison. The adhesion and tribological performance of different DLC coatings were evaluated by using variable depth nano-scratch tests and ball-on-disk wear tests. Among the four kinds of DLC coatings with different surface treatments, the bonding strength of hybrid pretreated coatings (TCDLC: 12.25 N) were highest compared with other three samples (ODLC: 5.73 N; TDLC: 8.72 N; CDLC: 9.28 N). The coupling of the mechanical-physical-chemical effects accompanying laser texturing and carburizing reaction can enhance the wettability and specific surface area of the Ti6Al4V substrate surface, thereby providing a mechanical selflocking and matching chemical property between the Ti6Al4V substrate and DLC coatings.
NSTL
Elsevier