TY - JOUR A1 - Dreßler, Martin A1 - Nofz, Marianne A1 - Saliwan Neumann, Romeo A1 - Dörfel, Ilona A1 - Griepentrog, Michael T1 - Sol-gel derived alumina layers on nickel-base superalloy Inconel-718 (IN-718) JF - Thin solid films N2 - Modified Yoldas sols can be used to prepare crack-free well adherent layers on different substrate materials such as soda–lime glass, corundum and metal (IN-718). These layers having thicknesses of 0.6 µm are strain tolerant and withstand thermal cycling between 810 °C and room temperature. Introducing alpha-Al2O3 filler particles into modified Yoldas sols allows the preparation of thicker layers of 1.6 µm, which as well can be thermally cycled without noticeable delaminations. Chemical bonding seems to be the predominant layer bonding mechanism. KW - Sol-gel KW - Alumosol KW - Filler particles KW - Inconel-718 KW - Scanning electron microscopy PY - 2008 DO - https://doi.org/10.1016/j.tsf.2008.08.124 SN - 0040-6090 VL - 517 IS - 2 SP - 786 EP - 792 PB - Elsevier CY - Amsterdam AN - OPUS4-18263 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR A1 - Dreßler, Martin A1 - Nofz, Marianne A1 - Dörfel, Ilona A1 - Saliwan Neumann, Romeo T1 - Influence of sol-gel derived alumina coatings on oxide scale growth of nickel-base superalloy Inconel-718 JF - Surface and coatings technology N2 - Alumina coatings with differing phase compositions were deposited on Inconel-718 (IN-718) Ni-base superalloy substrates using sol–gel processing. Mass gain measurements served for studying the oxidation behavior of coated metal surfaces if exposed to 800°C and 900°C for up to 4000 h in static air. Itwas found, that alumina coatings significantly reduce the oxidation related mass gain of IN-718 even after heating to 900°C for 4000 h. Transmission electron microscopy (TEM) studies revealed diffusion of elements from the metal substrate (IN-718) into the alumina coatings and — to a much lower degree — from the coating into the substrate. These diffusion processes are greatly influenced by the phase composition of the coatings, especially by the presence of alpha-alumina. KW - Oxide scale growth KW - Inconel-718 KW - Alumina coating KW - TEM PY - 2008 DO - https://doi.org/10.1016/surfcoat.2008.07.018 SN - 0257-8972 VL - 202 SP - 6095 EP - 6102 PB - Elsevier Science CY - Lausanne AN - OPUS4-17857 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER -