Nanostructural studies of PVD TiAlB coatings
نویسندگان
چکیده
TiAlB coatings with different compositions were deposited by co-sputtering from TiAl and TiB2 targets onto AISI316 stainless steel substrates at a temperature of 170(C. The stoichiometry and nanostructure have been studied by x-ray photoelectron spectroscopy (XPS), x-ray diffraction (XRD) and transmission electron microscopy (TEM). Analysis of the XPS spectra suggests the presence of phases in agreement with the equilibrium Ti-Al-B phase diagram. Diffraction studies (XRD and TEM) indicate that coatings with B/Al ratios ( 6 are amorphous, while coatings with B/Al ratios ( 6 exhibit a nanocomposite structure with average TiB2 grain sizes of ~2-3 nm for the highest B/Al ratio of 16. Nanocomposite coatings show significantly improved H/E ratios which are beneficial when protecting soft steels and light alloys.
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