Non-poisonous substitute for hard chrome in volume applications
| Reference number | |
| Coordinator | Linköpings universitet - Institutionen för fysik, kemi och biologi (IFM), Linköpings universitet |
| Funding from Vinnova | SEK 491 782 |
| Project duration | November 2017 - May 2018 |
| Status | Completed |
| Venture | The strategic innovation programme for Production2030 |
Purpose and goal
This study investigated the possibility of replacing hard chrome coatings with the Swedish innovation, TiSurf, a hardened nitrated surface layer of titanium with excellent chemical and mechanical properties. Extensive trials with nitride hardened titanium coated steel, aluminum and silicon specimens were carried out. PVD and Cold Spray methods for Ti coating were used in conjunction with TiSurf processes (vacuum and HIP). Microstructure was analysed with SEM, XRD and hardness. Marketing research was also performed. The project has resulted in continued collaborations.
Expected results and effects
Both PVD and Cold Spray provide even coatings of Ti with good adhesion to steel and Al. The microstructure and mechanical properties are not affected by the follow-up TiSurf process (vacuum, HIP), and the hardness is completely in line with data for TiN materials. The prospects for replacing hard chrome with TiSurf are therefore excellent. A patent for the TiSurf process with HIP has been applied for and with new IP from the project, NST will strengthen its market potential. Further, good collaboration between the partners has been established and new project proposals being submitted.
Planned approach and implementation
The initiation phase was implemented according to plan with a kick-off meeting where practical formulation of the ideas from the application were discussed and decided upon. LiU and a supplier developed the Ti coating processes, while NST tested various methods of nitration hardening of the resulting titanium surfaces. Material characterisation and measurements of the test series of nitride hardened Ti coated samples were performed by LiU. The market-oriented analyses were carried out by NST.