AVS 60th International Symposium and Exhibition
    Advanced Surface Engineering Thursday Sessions
       Session SE-ThP

Paper SE-ThP3
Mechanical Properties and Impact Resistance of CrAlSiN and TiAlSiN Coatings

Thursday, October 31, 2013, 6:00 pm, Room Hall B

Session: Poster Session
Presenter: Y.Y. Chang, National Formosa University, Taiwan, Republic of China
Authors: Y.Y. Chang, National Formosa University, Taiwan, Republic of China
Y.C. Yang, National Formosa University, Taiwan, Republic of China
Y.K. Chou, National Formosa University, Taiwan, Republic of China
J.X. Liu, National Formosa University, Taiwan, Republic of China
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The extension of the tool life is a considerable goal for high speed precision forming tools. Therefore, it is interested to reduce the friction and wear for such tools. The employment of hard coatings, in form of metal and ceramic, increases the production and maintenance costs. In this study, CrAlSiN and TiAlSiN coatings have been deposited on cemented carbide tools by using cathodic-arc evaporation with plasma enhanced duct equipment. Titanium, TiAl, TiSi and CrAlSialloy cathodes were used for the deposition. The alloy content of the deposited coating was correlated with the evaporation rate of cathode materials. The microstructure of the deposited coatings was characterized by using a field emission gun high resolution transmission electron microscope (FEG-HRTEM, FEI Tecnai G2 20 S-Twin), equipped with an energy-dispersive x-ray analysis spectrometer (EDS), operated at 200 keV for high-resolution imaging. Glancing angle X-ray diffraction was used to investigate the microstructure and phase identification of the films. The composition and depth profile were assessed by wavelength-dispersive x-ray spectroscopy (WDS). Mechanical properties, such as the hardness and elastic modulus, were measured by means of nanoindention. To evaluate the correlation between impact fracture resistance and hardness/elastic modulus ratio of the deposited coatings, an impact test was performed using a cyclic loading device with a tungsten carbide indenter as an impact probe. The design of CrAlSiN and TiAlSiN coatings is anticipated to inhibit the grain growth, and leads to grain refinement effect, which expected to increase the hardness and impact resistance of coatings.