Comparing the performance of several tool coatings in turning of commercially pure titanium grade 4

The increasing use of titanium and its alloys in the manufacture implants results from simultaneous presence excellent biocompatibility, relatively low density, high mechanical properties, corrosion resistance. Unlike application characteristics, is classified as a difficult-to-machine material. Therefore, one constant challenge for implant manufacturers to correctly choose turning tools each application. This work aims compare useful life uncoated insert with other three types coatings on carbide tools, aluminum nitride (TiAlN), chromium (AlCrN), nitride/titanium carbonitride multilayer coating (TiN + TiCN). Turning experiments were performed using grade 4 commercially pure (typically used dental implants), testing two cutting speeds tool used. tests carried out CNC rotary head lathe, fluid abundance. showed that achieved shortest due worst properties (lower surface hardness, higher friction coefficient, lower maximum working temperature), even supposedly chemical stability titanium. On hand, TiN TiCN obtained longest among four tested inserts. main novelty this coating) did not have best coatings. In fact, it had both lowest hardness temperature. However, has coefficient structure coating, which increases resistance against wear mechanism occurred predominantly application, was attrition. Even increased speed, also result. during machining titanium, most important characteristics are pull particles.