INFLUENCE OF NANOPARTICLE'S SIZE ON MICROSTRUCTURE OF OXIDE COATINGS

摘要

The microstructure and structure of composite coatings prepared on aluminum substrates are studied. Amorphous oxide layers Al_2O_3 are obtained on EN AW 5251 aluminum alloy. In the Al_2O_3 coating two kinds of inorganic fullerene-like (IF) tungsten disulfide (WS_2) nanoparticles (NPs) are introduced by a dip coating method. In order to show the difference in the possibility of introducing the NPs in the microstructure of Al_2O_3 the scanning electron microscopy and transmission electron microscopy analysis are carried out. Image processing and analysis were conducted in order to study the shape and size of the IF-WS_2 nanoparticles. Visual comparative analysis shows the difference of nanopowders quality that greatly affects their ability to form agglomerates, and, hence, strongly influences the possibility of introducing the NPs into nanopores.