TY - CONF A1 - Feigl, Michael A1 - Zietelmann, Christina A1 - Sabel, Martin A1 - Nofz, Marianne T1 - Electrochemical evaluation of corrosion behaviour of sol-gel alumina coated steel AlSl304 and Ni-base alloy Inconel-718 T2 - Eurocorr 2011 CY - Stockholm, Sweden DA - 05.09.2011 PY - 2011 AN - OPUS4-24870 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR A1 - Schulz, Wencke A1 - Nofz, Marianne A1 - Feigl, Michael A1 - Dörfel, Ilona A1 - Saliwan Neumann, Romeo A1 - Kranzmann, Axel T1 - Corrosion of uncoated and alumina coated steel X20CrMoV12-1 in H2O-CO2-O2 and air at 600 °C N2 - Future coal power plants will in case of oxyfuel combustion be operated with altered atmospheres. Hence, corrosion attack might become more severe and steels have to be protected. An alumina-sol was used to coat X20CrMoV12-1 (X20) with alumina to test the protection. Testing was performed at 600 °C in flowing H2O–CO2–O2 and static laboratory air for 1000 h. Oxidation under air is minor compared to exposure in oxyfuel atmosphere. In both cases a multilayered oxide (hematite, magnetite, spinel) was formed on uncoated steels. Carburization appeared on uncoated X20 in H2O–CO2–O2. The coating demonstrates a high protection. KW - A. Steel KW - B. SEM KW - B. STEM KW - C. Carburization KW - C. High temperature corrosion KW - C. Oxide coatings PY - 2013 DO - https://doi.org/10.1016/j.corsci.2012.10.031 SN - 0010-938X VL - 68 SP - 44 EP - 50 PB - Elsevier Ltd. CY - Orlando, Fla. AN - OPUS4-27636 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Feigl, Michael A1 - Nofz, Marianne T1 - Improving alumo sol wetting properties for easier coating applications T2 - Junior-Euromat 2008 CY - Lausanne, Switzerland DA - 2008-07-14 PY - 2008 AN - OPUS4-17266 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Feigl, Michael A1 - Nofz, Marianne T1 - Better sol-gel coatings through improved substrate wetting T2 - Tagung "Materials Science and Engineering" CY - Nuremberg, Germany DA - 2008-09-01 PY - 2008 AN - OPUS4-17652 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR A1 - Dreßler, Martin A1 - Dombrowski, Felix A1 - Simon, Ulla A1 - Börnstein, Julian A1 - Hodoroaba, Vasile-Dan A1 - Feigl, Michael A1 - Grunow, Sabrina A1 - Gildenhaar, Renate A1 - Neumann, Martin T1 - Influence of gelatine coatings on compressive strength of porous hydroxyapatite ceramics N2 - Porous ceramics prepared by the foam replication technique have a high porosity and low mechanical stability. It has been reported that coating such porous ceramics with gelatin allows for an improved compressive strength. Little details regarding the influence of important gelatin parameters such as concentration, temperature and drying conditions as well as bloom number which is a measure of the gel rigidity, on this toughening effect are available. This paper investigates the influence of these parameters on compressive strength of gelatin coated porous hydroxyapatite ceramics. It was found that concentration in the gelatin sols has a marked impact whereas sol temperature, bloom number and differing conditions during subsequent drying have only little influence on the compressive strength of the coated ceramics. KW - Films KW - Composites KW - Strength KW - Apatite KW - Biomedical application PY - 2011 DO - https://doi.org/10.1016/j.jeurceramsoc.2010.11.004 SN - 0955-2219 SN - 1873-619X VL - 31 IS - 4 SP - 523 EP - 529 PB - Elsevier Ltd. CY - Oxford AN - OPUS4-23216 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Feigl, Michael A1 - Pulz, Robert A1 - Sojref, Regine A1 - Feldmann, Ines A1 - Dörfel, Ilona A1 - Rehmer, Birgit A1 - Nofz, Marianne T1 - Nd: YAG laser induced thermal shock testing of oxidation preotecting sol-gel alumina coatings on Ni-base alloys T2 - Eurocorr 2011 CY - Stockholm, Sweden DA - 05.09.2011 PY - 2011 AN - OPUS4-23203 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR A1 - Schulz, Wencke A1 - Feigl, Michael A1 - Dörfel, Ilona A1 - Nofz, Marianne A1 - Kranzmann, Axel T1 - Influence of a sol-gel alumina coating on oxidation of X20CrMoV12-1 in air up to 650 °C N2 - The need for a more efficient coal power plant generation (e.g. oxyfuel technology) results in modified process parameters and enhanced corrosion. To reach the necessary service life of high temperature parts protective coatings may be a sufficient technical solution. A modified Yoldas sol (Al2O3 based) was used to coat X20CrMoV12-1 by spin coating. After appropriate heat treatments transition alumina coatings being about 400 nm thick were obtained. Oxidation studies were carried out in laboratory air at temperatures up to 650 °C for up to 500 h exposure time. In case of the uncoated sample a rough oxide layer formed on the surface and a remarkable weight gain (2.62 mg/cm²) were detected. The sol–gel alumina layer (mainly δ-Al2O3) demonstrated a high protection, i.e. a very low weight gain (0.05 mg/cm²). Diffusion of alloying elements into the coating was observed. No indication of spallation of the coating occurred. Local defects (2 µm–30 µm) in the coating led to the formation of iron-oxide islands. KW - X20CrMoV12-1 KW - Sol-gel deposition KW - Alumina KW - Air oxidation KW - Transmission electron microscopy KW - Chromium KW - Diffusion KW - Manganese PY - 2013 DO - https://doi.org/10.1016/j.tsf.2013.04.132 SN - 0040-6090 VL - 539 SP - 29 EP - 34 PB - Elsevier B.V. CY - Amsterdam AN - OPUS4-29162 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Feigl, Michael A1 - Nofz, Marianne A1 - Sojref, Regine A1 - Dreßler, Martin A1 - Pulz, Robert A1 - Rehmer, Birgit A1 - Feldmann, Ines A1 - Sabel, Martin T1 - Aluminiumoxidschichten für den Oxidations-schutz von Hochtemperaturlegierungen T2 - DKG-Jahrestagung 2009 Symposium HLK DKG/DGM 2009 CY - Aachen, Germany DA - 2009-03-23 PY - 2009 AN - OPUS4-18963 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Feigl, Michael A1 - Nofz, Marianne A1 - Sojref, Regine A1 - Dreßler, Martin A1 - Schulz, Wencke A1 - Hünert, Daniela A1 - Dörfel, Ilona A1 - Kranzmann, Axel T1 - Influence of Different atmospheres on the high Temperature corrosion Protection abilities of Alumina Coatings on alloys T2 - Eurocorr 2009 The European Corrosion Congress CY - Nice, France DA - 2009-09-06 PY - 2009 AN - OPUS4-18969 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR A1 - Feigl, Michael A1 - Nofz, Marianne A1 - Sojref, Regine A1 - Kohl, Anka T1 - Improved wetting of bare and pre-coated steels by aqueous alumina sols for optimum coating success N2 - Alumina coatings are a promising candidate for the protection of metals prone to high temperature corrosion. If applied via sol–gel process, especially by using so called aqueous modified Yoldas-sols, the deposition is hardened by differences in surface free energy of substrate and sol. In this paper the apparent surface properties of samples to be coated and sols were examined by contact angle measurements, IR-spectroscopy and tensiometry. The results imply, after consideration of possible uncertainties, the use of surface tension reducing 2-butanol already present during hydrolysis of the sols to obtain an easy and successful coating process. KW - Sol-gel KW - Wetting KW - Coating KW - IR-spectroscopy PY - 2010 DO - https://doi.org/10.1007/s10971-010-2232-7 SN - 0928-0707 SN - 1573-4846 VL - 55 IS - 2 SP - 191 EP - 198 PB - Kluwer Academic Publ. CY - Dordrecht AN - OPUS4-22602 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER -