20.500.12556/DKUM-50133 Characterization of defects in PVD TiAlN hard coatings Karakterizacija defektov PVD TiAlN trdih prevlek PVD hard coatings are continuously gaining their importance in different fields of applications. In industrial use, they are often exposed to corrosive environments. Hard coatings possess inherently good corrosion resistance, but the substrate-hard coating systems may suffer from a severe corrosion attack due to the defects (craters, pin holes) in the coatings. On the sites, where defects extend through the coating, pitting corrosion can take place. These sites are drawbacks in the applications of hard coating. A PVD TiAlN hard coating was prepared on cold-work, tool-steel (AISI D2) substrates by sputtering using unbalanced magnetron sources. The growth defects incorporated into the coating were studied after the deposition and corrosion experiments. We used two methods: (1) scanning electron microscopy (SEM) for general overview of the coating topography and 2D-characterization of defects, and (2) scanning electron microscopy with a focused ion beam (SEM-FIB) for making serial cross-sections through the selected defects in order to provide images for a 3D-reconstruction of defects. In this work we tried to investigate the formation of a defect at a specific location and findout whether the selected defect causes pitting corrosion. PVD trde prevleke pridobivajo pomen na različnih področjih uporabe. Pri različnih aplikacijah so pogosto izpostavljene korozijskemu okolju. Trde prevleke so kemijsko inertne in same po sebi korozijsko obstojne. Med njihovo pripravo pa nastane v njih veliko defektov (kraterji, "pinholi"). Nekateri od njih segajo do podlage. Na teh mestih pride do jamičaste korozije, kar pa je z vidika uporabe neželeno. TiAlN-prevleko smo nanesli na podlago orodnega jekla D2 po postopku naprševanja z neuravnoteženim magnetronskim izvirom. Defekte, ki so nastali med pripravo plasti, smo preučili po korozijskem preizkusu. Za analizo smo uporabili dve metodi. Vrstični elektronski mikroskop(SEM), s katerim smo pridobili splošni pregled prevleke, kot tudi 2D-karakterizacijo defektov. Kot drugo metodo smo uporabili fokusiran ionski curek, ki je integriran v klasični SEM, s katerim smo izvedli serijo rezov izbranih defektov za njihovo 3D-karakterizacijo. V delu smo poskušali na specifičnih mestih ugotoviti mehanizem nastanka defektov in ugotovljali, ali povzročajo jamičasto korozijo. trde prevleke PVD prevleke defekti jamičasta korozija mikrostruktura PVD hard coating defect pitting corrosion microstructure PVD hard coating defect 3D-reconstruction FIB SEM true false true Angleški jezik Slovenski jezik Znanstveno delo 2015-07-10 12:36:05 2015-07-10 12:36:05 2022-05-28 03:08:40 2022-03-30 03:06:46 2012 0 0 str. 351-354 št. 4 Letn. 46 jul.-avg. 2012 0000-00-00 Zaloznikova Objavljeno NiDoloceno 0000-00-00 0000-00-00 0000-00-00 1580-2949 621.793:669.058.67:66.019 106193664 16153622 1580-2949 URN:SI:UM:DK:ZMEF31CI Materiali_in_Tehnologije_2012_Gselman_et_al._CHARACTERIZATION_OF_DEFECTS_IN_PVD_TiAlN_HARD_COATINGS.pdf Materiali_in_Tehnologije_2012_Gselman_et_al._CHARACTERIZATION_OF_DEFECTS_IN_PVD_TiAlN_HARD_COATINGS.pdf 1 81B30479F191C688AE6B4ADA887C533E 36fe0126614e19ce8107b3de0361599445ce258a7f09c6bd70a6845bcc7e075c fc4a78c5-7c0d-11eb-bb7a-00155d0001ca https://dk.um.si/Dokument.php?lang=slv&id=109794 http://mit.imt.si/Revija/izvodi/mit124/gselman.pdf 1 https://dk.um.si/Dokument.php?lang=slv&id=74691 Fakulteta za strojništvo 0 0 0