Open Access
Table 3
TiN coating characteristics.
| Coating thickness | Approximately 4 µm |
| Coating thickness is measured using a process known as calotte grinding test, on test pieces that are coated with each implant batch. | |
| Hardness | Ca. 2400 HV (0.1 N) Hardness is measured using a micro-hardness test. The hardness of CoCrMo alloys is only 650 HV (0.1N). |
| Adhesive strength | Adhesive strength 1–2. |
| Adhesive strength is tested in accordance with VDI guideline 3824 using the Rockwell HRC test. In addition, a thorn bending test is carried out using a Scratch test plate. These tests have demonstrated that the coating has outstanding adhesive properties. | |
| Roughness | Ra < 0.05 µm |
| Roughness determined with the profile method acc. to DIN EN ISO 4287. These roughness values are in compliance with the DIN EN ISO 21534. | |
| Tribolgoy and wear resistance | Low friction coefficient in contact with UHMWPE; ion release is suppressed upon exposure to frictional fretting. A significantly higher degree of surface scratch resistance. |
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