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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,*  and 2,3
1 Department of Mechanical and Automation Engineering, National Kaohsiung First University of Science and Technology, 2 Juoyue Rd., Nantz District, Kaohsiung 81164, Taiwan 2 Institute of Engineering Science and Technology, National Kaohsiung First University of Science and Technology, 2 Juoyue Rd., Nantz District, Kaohsiung 81164, Taiwan 3 Metal Industries Research & Development Centre, 1001 Kaonan Highway, Kaohsiung 811, Taiwan
* Author to whom correspondence should be addressed.
Received: 27 June 2013 / Revised: 26 July 2013 / Accepted: 2 August 2013 / Published: 7 August 2013
(This article belongs to the Special Issue Advances in Surface Coatings 2013)
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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 nitride; DLC; hydrophobic; hydrophilic; water contact angle; anti-sticking
This is an open access article distributed under the Creative Commons Attribution License (CC BY 3.0).
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Yang, Y.-S.; Cho, T.-P. Effect of Annealing Temperature on the Water Contact Angle of PVD Hard Coatings. Materials 2013, 6, 3373-3386.

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