Oxidation Behavior and Cutting Performance between Ti0.75-Al0.25-N and Ti0.69-Al0.23-Si0.08-N Coated Tool through Measurement of Cutting Temperature
Ti-Al-Si-N and Ti-Al-N coatings were deposited on WC-Co substrates by a DC magnetron sputtering method. The oxidation behavior of two kinds of Ti0.75Al0.25N and Ti0.69Al0.23Si0.08N coatings were comparatively investigated by XRD patterns and GDOES depth profiles. Si addition of 8 at.% into Ti-Al-N film modified its microstructure to a fine composite comprising, Ti-Al-N crystallites and amorphous Si3N4, and to a smoother surface morphology. While the solid solution Ti0.75Al0.25N film had superior oxidation resistance up to around 700°C, the composite Ti-Al-Si-N film showed further enhanced oxidation resistance. Both Al2O3 and SiO2 layers played roles as a barrier against oxygen diffusion for the quaternary Ti-Al-Si-N film, whereas only the Al2O3 oxide layer formed at surface did a role for the Ti-Al-N film. The cutting performances of two coated carbide ball-end mills were evaluated by cutting of AISI D2 cold-worked die steel (60 HRC) under high-speed cutting condition. The tool wear and cutting temperature are discussed along with coating characteristics.
Byungsei Jun, Hyungsun Kim, Chanwon Lee, Soo Wohn Lee
S. H. Shin et al., "Oxidation Behavior and Cutting Performance between Ti0.75-Al0.25-N and Ti0.69-Al0.23-Si0.08-N Coated Tool through Measurement of Cutting Temperature", Materials Science Forum, Vol. 569, pp. 141-144, 2008