Al2O3-nanodiamond composite coatings with high durability and hydrophobicity prepared by aerosol deposition

Autor: Dae Soon Lim, Hyung Jun Kim, Min Goon Jeong, Song Min Nam, Dong-Won Lee, Won Hee Lee
Rok vydání: 2012
Předmět:
Zdroj: Surface and Coatings Technology. 206:4679-4684
ISSN: 0257-8972
DOI: 10.1016/j.surfcoat.2012.05.052
Popis: We attempted the room-temperature fabrication of Al 2 O 3 -based nanodiamond (ND) composite coating films on glass substrates by an aerosol deposition (AD) process to improve the anti-scratch and anti-smudge properties of the films. Submicron Al 2 O 3 powder capable of fabricating transparent hard coating films was used as a base material for the starting powders, and ND treated by 1H,1H,2H,2H-perfluorooctyltriethoxysilane (PFOTES) was added to the Al 2 O 3 to increase the hydrophobicity and anti-wear properties. The ND powder treated by PFOTES was mixed with the Al 2 O 3 powder by ball milling to ratios of 0.01 wt.%, 0.03 wt.%, and 0.05 wt.% ND. The water contact angle (CA) of the Al 2 O 3 -ND composite coating films was increased as the ND ratio increased, and the maximum water CA among all the films was 110°. In contrast to the water CA, the Al 2 O 3 -ND composite coating films showed low transmittance values of below 50% at a wavelength of 550 nm due to the strong agglomeration of ND. To prevent the agglomeration of ND, the starting powders were mixed by attrition milling. As a result, Al 2 O 3 -ND composite coating films were produced that showed high transmittance values of close to 80%, even though the starting powder included 1.0 wt.% ND. In addition, the Al 2 O 3 -ND composite coating films had a high water CA of 109° and superior anti-wear properties compared to those of glass substrates.
Databáze: OpenAIRE
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