ISSN:
1662-8985
Source:
Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
Topics:
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
Notes:
CrN/ZrN (1, 8, 15, and 30) bilayers were deposited onto AISI 420 steel substrates at250 °C and 6.6x10-3 mbar with gas ratio Ar/N2 50:3.0 as gas mixture and bias -60V were applied.AFM analysis presented different morphologies, showing that the coatings with 15 bilayers had anaverage grain size of 49 nm; while the 30-bilayer coating exhibited grain sizes of 99 nm. Coatingthicknesses were 3 μm, approximately. The Vickers Test revealed that coatings with 8, 15, and 30bilayers bore better impact resistance than coatings with 1 bilayer. This result is considered,bearing in mind that in many bilayers propagation of fissures is slower, because the presence oflayer inter-phases leads to fissures straying in other directions. Slight corrosion specks are present,but mass loss was around 40 mg. in one bilayer, a higher value than for the coatings with 15bilayers that was near 18 mg. Homogeneity, grain size, fracture resistance, and corrosion resistanceof the coatings with 15 and 30 bilayers are suitable for mechanical applications of these types ofcoatings, as shown in mechanical measurements. These results indicate that for engineeringapplications under corrosive environments, the use of these types of bilayer coatings on AISI 420stainless steel is highly recommended
Type of Medium:
Electronic Resource
URL:
http://www.tib-hannover.de/fulltexts/2011/0528/01/40/transtech_doi~10.4028%252Fwww.scientific.net%252FAMR.38.63.pdf
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