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

3. Results and discussion

3.1. Coating characterization

Fig. 2 shows the thickness of the Co interlayer as a function of sputter time at fixed Co sputter  current of 0.4 A. The thickness of Co interlayer linearly increased from 0.027 μm to 0.160 μm with increasing the sputter time from 10 to 60 min. This result reflects that our hybrid coating system enables an easy control of Co interlayer in synthesis of TiN/Co/WC-Co systems. After deposition of Co interlayer, the TiN coatings were deposited under condition shown in Table 1 by AIP method. The thickness of TiN was approximately 2.5μm. Additionally ,the micro-indentation hardness of the TiN coating layers were found to almost constantly maintain from 27 GPa to 30 GPa at approximately 0.027 μm of thickness of Co interlayer. However, the hardness of TiN having Co interlayer linearly decreased with further increase in the thickness of Co interlayer. This effect is related to a change in the mean free path of Co, which is defined as the thickness of Co in the WC-Co system.

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