Coatings nanocomposites

PANI-coated nanocomposites show enhanced particle anti-settling and the ER effect of some systems is improved compared to the traditional PANI particles. However, the conductivity of PANI-coated nanocomposites is... 

Thin films Nanograined coatings Nanocomposite coatings Smart coatings... 

Composite and phase-dispersed films and coatings Nanocomposite materials Thin-walled freestanding structures and foils... 

Keywords Siliconized epoxy, phosphorus-containing bismaleimide, DOPO, POSS, antifouling coatings, nanocomposites, nanohybrid coatings, anticorrosive coatings, intercrosslinked networks, flame retardancy... 

In addition, the impurities, especially the oxygen, can strongly decrease the hardness of nanocomposite coatings. That should be the primary reason for the lower hardness... 

Fig. 18—High resolution TEM plan-view image of TiN/Si3N4 nanocomposite coating with Si content of 10.8 at. % and hardness of 42 GPa. The coating was deposited on NaCI substrate for about 50 nm thick and then was floated off onto a mesh. The crystallites were confirmed to be TIN by the interplanar distance of 0.21 nm, which is the TIN (200) interplanar distance. The gain size of the TiN crystallites is less than 5 nm.

Fig. 17—XPS spectrum of Si 2p peak for the TiN/Si3N4 nanocomposite coating with the optimum Si content of 10.8 at. % and the maximum hardness of 47.1 GPa.

Veprek et al. [120,121,144] present the explanation of the superhardness for the nanocomposite coating on the basis of the absence of dislocation activity in a few-nanometre-... 

Fig. 22—Friction coefficients between WC ball and TiN/Si3N4 nanocomposite coatings as function of the Si content. The coatings were deposited by reactive magnetron sputtering. The friction coefficients of the TiN/Si3N4 coatings were obtained under the load of 20 N. In the case of the TiN coating and the Si3N4 coating, the load is 5 N, because the two coatings will fail and peel off from the substrate under the load of 20 N.

Fig. 23—The cutting life of the uncoated drill and the drills deposited with TiN coating and TiN/Si3N4 nanocomposite coatings drilling holes on quenched AISI 420 stainless steel. The coatings were deposited by reactive magnetron sputtering.

Diserens, M., Patscheider, J., and Levy, F., "Mechanical Properties and Oxidation Resistance of Nanocomposite TiN-SiN Physical-Vapor-Deposited Thin Films, Surf. Coat. Technol,Vol. 120 Ill, 1999,65. 

Holubar, P., Jilek, M., and Sima, M., "Present and Possible Future Applications of Superhard Nanocomposite Coatings, Surf. Coat. Technol,Vol. 133/134,2000,pp. 145-151. 

MusU, J. and Polakova, H., "Hard Nanocomposite Zr-Y-N Coatings, Correlation Between Hardness and Structure, Surf. Coat. Technol, o. 127,2000,pp.99-106. 

Voevodin, A. A., Walck, S. D., andZabinski, J. S., Architecture of Multilayer Nanocomposite Coatings with Super-Hard Diamond-Like Carhon Layers for Wear Protechtion at High Contact Load, Wear, Vol. 203-204,1997, pp. 516-527. 

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