Materials 2013, 6(8), 3373-3386; doi:10.3390/ma6083373
Article

Effect of Annealing Temperature on the Water Contact Angle of PVD Hard Coatings

1,* email and 2,3email
Received: 27 June 2013; in revised form: 26 July 2013 / Accepted: 2 August 2013 / Published: 7 August 2013
(This article belongs to the Special Issue Advances in Surface Coatings 2013)
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
Abstract: Various PVD (physical vapor deposition) hard coatings including nitrides and metal-doped diamond-like carbons (Me-DLC) were applied in plastic injection and die-casting molds to improve wear resistance and reduce sticking. In this study, nitrides hcp-AlN (hexagonal close-packed AlN), Cr2N, (CrAl)2N) and Me-DLC (Si-DLC and Cr-DLC) coatings were prepared using a closed field unbalanced magnetron reactive sputtering system. The coatings were annealed in air for 2 h at various temperatures, after which the anti-sticking properties were assessed using water contact angle (WCA) measurements. The as-deposited hcp-AlN, Cr2N and (CrAl)2N coatings exhibit hydrophobic behavior and exhibit respective WCAs of 119°, 106° and 101°. The as-deposited Si-DLC and Cr-DLC coatings exhibit hydrophilic behavior and exhibit respective WCAs of 74° and 88°. The annealed Cr2N and (CrAl)2N coatings exhibit hydrophobic behavior with higher WCAs, while the annealed hcp-AlN, Si-DLC and Cr-DLC coatings are hydrophilic. The increased WCA of the annealed Cr2N and (CrAl)2N coatings is related to their crystal structure and increased roughness. The decreased WCA of the annealed hcp-AlN, Si-DLC and Cr-DLC coatings is related to their crystal structures and has little correlation with roughness.
Keywords: nitride; DLC; hydrophobic; hydrophilic; water contact angle; anti-sticking
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MDPI and ACS Style

Yang, Y.-S.; Cho, T.-P. Effect of Annealing Temperature on the Water Contact Angle of PVD Hard Coatings. Materials 2013, 6, 3373-3386.

AMA Style

Yang Y-S, Cho T-P. Effect of Annealing Temperature on the Water Contact Angle of PVD Hard Coatings. Materials. 2013; 6(8):3373-3386.

Chicago/Turabian Style

Yang, Yu-Sen; Cho, Ting-Pin. 2013. "Effect of Annealing Temperature on the Water Contact Angle of PVD Hard Coatings." Materials 6, no. 8: 3373-3386.


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