Fig. 1. Image of torsional test for set-screw driver tip based on ASTM F543: (a) Before, (b) After
Fig 3. Result of dynamic torsional test for TiN, DLC, and non-coated set-screw driver tip
Fig 2. Analytical protocol with torque vs. angle curve based on ASTM F543: A. torsional stiffness (N-m/°), B. Torsional yield strength (N-m), C. Torsional yield angle ( ° ), D. Ultimated torque (N-m)
Fig 5. Cross-sectional image of the (a) DLC coating, and (b) TiN coating layer obtained by FE-SEM
Fig 4. Representative image of test specimens: (a) non-coated set-screw driver tip, (b) DLC coated, (c) TiN coated
Fig. 6 Results of static torsional test for TiN, DLC coated, and non-coated set-screw driver tip. Significances were marked with star.
Fig. 7 Surface morphology of DLC, TiN, and Non-coated set-screw driver tip after the dynamic torsional durability test: (a) DLC coated, (b) TiN coated, (c) non-coated
Table 1. DLC and TiN coating method on set-screw driver tip
Table 2. Results of dynamic torsional durability test
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