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Influence of Nitrogen Content and Bias Voltage on Residual Stress and the Tribological and Mechanical Properties of CrAlN Films

1
Center for Plasma and Thin Film Technologies, Ming Chi University of Technology; 84 Gungjuan Rd., Taishan Dist., New Taipei City 24301, Taiwan
2
Department of Materials Engineering, Ming Chi University of Technology, 84 Gungjuan Rd., Taishan Dist., New Taipei City 24301, Taiwan
*
Author to whom correspondence should be addressed.
Coatings 2020, 10(6), 546; https://doi.org/10.3390/coatings10060546
Received: 18 May 2020 / Revised: 2 June 2020 / Accepted: 4 June 2020 / Published: 7 June 2020
This study deposited CrAlN coatings from Al50Cr50 targets using high-power impulse magnetron sputtering, with a focus on the effects of nitrogen content and substrate bias voltage on the deposition rate, microstructure, crystal orientation, residual stress, and mechanical properties of the coating. The nitrogen content was adjusted by varying the N2/Ar flow ratio between 20% and 140%. Increasing the nitrogen flow rate during deposition led to corresponding decreases in the deposition rate and film thickness. X-ray diffractometer (XRD) analysis revealed that a low N2/Ar flow ratio (<40%) resulted in amorphous CrAlN, whereas a higher ratio (>40%) resulted in an face-centered cubic (FCC) phase. Bias voltage also had considerable influence on the residual stress and grain size. A refined grain structure and high internal stress resulted in hard CrAlN coatings. Among the various parameter combinations evaluated in this study, the highest hardness (35.4 GPa) and highest elastic modulus (426 GPa) were obtained using an N2/Ar flow ratio of 100% and a bias voltage of −120 V. View Full-Text
Keywords: nitrogen content; CrAlN; residual stress; bias voltage; HiPIMS nitrogen content; CrAlN; residual stress; bias voltage; HiPIMS
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MDPI and ACS Style

Tang, J.-F.; Lin, C.-Y.; Yang, F.-C.; Chang, C.-L. Influence of Nitrogen Content and Bias Voltage on Residual Stress and the Tribological and Mechanical Properties of CrAlN Films. Coatings 2020, 10, 546.

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