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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