Effects of Underlayer(TiN, TiCN) on Transverse Rupture Strength, Bonding Strength and Cutting Tool Life of Cemented Carbide Coated with Titanium Carbide by CVD Process

화학흡착(CVD)법에 의한 TiC 흡착시 하경사(TiN, TiCN)이 피복 길항합금의 항면력, 흡착력 및 공패수명에 미치는 영향

Generally brittle eta phase produced during TiC deposition has a effect on the TRS (transverse rupture strength ; thoughness). Therefore it is necessary to reduce eta(η), phase for the improvement of tool life. At this experiment some properties (TRS, bonding strength, tool life, eta phase)have been investigated by inserting TiN or TiCN underlayer between TiC layer and substrate. The results obtained were as follows; 1. by inserting underlayer eta phase were decreased and TRS was increased, but the bonding strength was decreased. 2. the diffusion of W, Co from the substrate was hindered by the underlayer. 3. TiC layer with TiCN underlayer had the finsest grain size. 4. by inserting underlayer (TiCN or TiN) the tool life was improved and especially notch and crater wear resistance was greatly improved.