Effect of nitrogen partial pressure on characteristic and mechanical properties of hard coating TiAlN Film

Authors

  • Chaiwat Chokwatvikul Division of Materials Technology, School of Energy, Environment and Materials, King Mongkut's University of Technology Thonburi
  • Siriporn Larpkiattaworn Department of Materials Innovation, Thailand Institute of Scientific and Technological Research (TISTR)
  • Surasak Surinphong NanoShield PVD Hard Coating
  • Chumphol Busabok Department of Materials Innovation, Thailand Institute of Scientific and Technological Research (TISTR)
  • Preecha Termsuksawad Division of Materials Technology, School of Energy, Environment and Materials, King Mongkut's University of Technology Thonburi

Keywords:

(Ti,Al)N film, PVD, Cathodic Arc

Abstract

(Ti,Al)N coating has been serving for the industry as cutting and forming tools. Compared with TiN film, TiAlN film significantly increases tool lifetime. Therefore, it reduces machine downtime and increases productivity. In this work, (Ti,Al)N film was deposited on cold-work tool steel (SKD 11) using PVD cathodic arc system. The sintered Ti-Al target with composition of (at%) 50 Ti and 50 Al was used as a cathode. The deposition bias voltage, bias arc current and deposition time were set at 100 V, 70 A and 90 minutes, respectively. Nitrogen gas was purged into the system with the applied pressure of 1, 1.5 and 2 Pa, respectively. After coating, the film was characterized for crystal structures and mechanical properties. It was found that all films have the same crystal structures of Ti0.5Al0.5N and TiN0.5 with the thickness in the range of 2-3 μm. Moreover, the film prepared at N2 pressure of 1.5 Pa possesses the highest hardness (48 GPa), high adhesion strength (>150 N), and good adhesion (HF1 class). The difference of hardness and adhesion of the film was found to be resulted by size and dispersion of macroparticles.

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References

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Published

2011-06-30

How to Cite

[1]
C. Chokwatvikul, S. Larpkiattaworn, S. Surinphong, C. Busabok, and P. . Termsuksawad, “Effect of nitrogen partial pressure on characteristic and mechanical properties of hard coating TiAlN Film”, J Met Mater Miner, vol. 21, no. 1, Jun. 2011.

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Original Research Articles

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