Cobalt Interlayed TiN-coated Tungsten Carbide Cutting Tool’s Performance Ⅳ

2.2 Coating evaluation

The thickness of TiN coatings and interlayers was measured using a stylus ( α -ST EP) instrument and a scanning electron microscopy (Hitachi,S-4200). Hardness was determined using microhardness tester with Knoop indenter (Matsuzaw a, MMT-7) under a load of 25 g. The adhesion behavior between TiN coatings and WC-Co substrate was investigated with a scratch tester (J& L Tech , Scratch test JL ST022) using a Rockwell C diamond stylus (cone apex angle: 120°; tip radius: 200 μ m). During the scratch test, the stylus load was increased continuously up to 150 N with a loading rate (d L/d t ) of 3 N/s and a translation speed of 0.2 mm /s. The friction force (FF), friction coefficient (FC ) and acoustic emission (AE) signals were recorded. These investigations were complemented by observation of scratch track with the optical and SEM microscope (Olympus, PMG3-613U W/A cc) examination and a scanning electron microscope.

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