TY - JOUR A1 - Steinborn, Gabriele A1 - Tzschichholz, Grit A1 - Günster, Jens A1 - Keller, M.H. A1 - Manara, J. T1 - Porous TiO2-Y2O3 ceramics with specific infrared-optical properties N2 - The infrared-optical properties and particularly the emissivity of sintered ceramics depend on the material's bulk properties and structural properties such as porosity, pore size distribution and pore diameter. The infrared-optical properties can be varied across a wide range by specifically selecting the material's bulk and structural properties. A major concern of the present study is the development of a ceramic coating material with a total emissivity below 0.2 at a temperature of 800 °C. For this purpose, various samples of a TiO2-Y2O3 (TY) ceramic composite were produced with different properties. On variation in the Y2O3 content from 5 to 60 wt%, the porosity of the ceramic composites varies from 3 % to 47 % with the mean pore diameter lying in a range from 0.3 µm to 1.7 µm. The addition of graphitic pore builders increases the porosity up to 60 % and the mean pore diameter to a maximum of 15 µm. By optimizing the total porosity and the pore size of the TY ceramics, a total emissivity as low as 0.17 at 800 °C could be achieved. KW - Oxide ceramic KW - Porosity KW - Mean pore diameter KW - Infrared optical properties KW - Emissivity PY - 2011 DO - https://doi.org/10.4416/JCST2011-00011 SN - 2190-9385 VL - 2 IS - 3 SP - 183 EP - 190 PB - Göller CY - Baden-Baden AN - OPUS4-24551 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Tzschichholz, Grit A1 - Steinborn, Gabriele A1 - Keller, M. A1 - Manara, J. T1 - Porous composite materials from nano-powders with customised radiative transport characteristics T2 - 10th ECerS Conference CY - Berlin, Germany DA - 2007-06-17 PY - 2007 AN - OPUS4-15872 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - GEN A1 - Tzschichholz, Grit A1 - Steinborn, Gabriele A1 - Keller, M.H. A1 - Manara, J. T1 - Porous nano-composite materials with low emittance for reducing energy consumption T2 - Nanofair 2008 - New Ideas for Industry / 6th International Nanotechnology Symposium CY - Dresden, Germany DA - 2008-03-11 PY - 2008 SN - 978-3-18-092027-6 SN - 0083-5560 N1 - Serientitel: VDI-Berichte – Series title: VDI-Berichte IS - 2027 SP - 231 EP - 235 PB - VDI-Verl. CY - Düsseldorf AN - OPUS4-17746 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Tzschichholz, Grit A1 - Steinborn, Gabriele A1 - Hentschel, Manfred P. A1 - Lange, Axel A1 - Keller, M. A1 - Manara, J. T1 - Correlation between structured and infrared-optical properties of nano-composite materials T2 - Junior-Euromat 2008 CY - Lausanne, Switzerland DA - 2008-07-14 PY - 2008 AN - OPUS4-18105 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Tzschichholz, Grit A1 - Steinborn, Gabriele A1 - Sauter, Ph A1 - Keller, M. A1 - Manara, J. T1 - Poröse Nanokompositmaterialien mit spezifischen infrarot-optischen Eigenschaften T2 - Jahrestagung der DKG; Symposium Hochleistungskeramik CY - Dresden, Germany DA - 2007-03-19 PY - 2007 AN - OPUS4-14579 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Tzschichholz, Grit A1 - Steinborn, Gabriele A1 - Keller, M. A1 - Manara, J. T1 - Porous nano-composite materials with low emittance for reducing energy consumption T2 - NanoFair 2008 CY - Dresden, Germany DA - 2008-03-11 PY - 2008 AN - OPUS4-17645 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Tzschichholz, Grit A1 - Steinborn, Gabriele A1 - Hentschel, Manfred P. A1 - Lange, Axel A1 - Keller, M. A1 - Manara, J. T1 - Röntgenrefraktometrie - eine alternative Methode zur Charakterisierung poröser Keramiken T2 - DKG-Jahrestagung 2008 CY - Höhr-Grenzhausen, Germany DA - 2008-05-26 PY - 2008 AN - OPUS4-17647 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Tzschichholz, Grit A1 - Steinborn, Gabriele A1 - Zimathies, Annett A1 - Klobes, Peter T1 - Einsatz verschiedener Porenbildner zur Herstellung poröser Kompositkeramiken aus Nanopulver T2 - DKG-JT 2009/ DGM Symposium HLK 2009 CY - Aachen, Germany DA - 2009-03-22 PY - 2009 AN - OPUS4-19691 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Tzschichholz, Grit A1 - Steinborn, Gabriele A1 - Hoffmann, M.J. A1 - Keller, M. A1 - Manara, J. T1 - Maßgeschneiderte poröse TiO2-Y2O3-Keramiken mit spezifischen infrarot-optischen Eigenschaften T2 - DKG-Jahrestagung, Symposium Hochleistungskeramik CY - Hermsdorf (Thuringia), Germany DA - 2010-03-22 PY - 2010 AN - OPUS4-22777 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR A1 - Tzschichholz, Grit A1 - Steinborn, Gabriele A1 - Hentschel, Manfred P. A1 - Lange, Axel A1 - Klobes, Peter T1 - Characterisation of porous titania yttrium oxide compounds by mercury intrusion porosimetry and X-ray refractometry N2 - Aiming at ceramic materials of low thermal radiation emittance titania yttrium oxide ceramics have been prepared by sintering in air at 1,100 and 1,400 °C, respectively, and characterised. Due to its high infrared refractive index, average pore sizes up to 1 µm for optimal Mie scattering cross sections and over 35% porosity the material is a promising candidate for elevated temperature insulations. The essentially in large pore growth is achieved by graphitic nano and micro particle additives. The microstructure parameters of porosity, specific surface area, median and average pore sizes are determined by mercury intrusion porosimetry. Beyond this classical technique supplementary measurements by X-ray Absorption and X-ray refractometry reveal considerably larger average pore sizes due to closed pores not accessible for mercury. An additional advantage of the X-ray techniques is their non-destructive application, which allows other treatments afterwards. The combined application of both methods provides additional information and reliability in case of complex ceramic microstructures and may serve for improved developments of porous ceramics with optimised thermal scattering for energy savings in high temperature applications. KW - Porous ceramics KW - Mercury intrusion porosimetry KW - X-ray refractometry KW - Porosity KW - Specific surface area KW - Average pore size PY - 2011 DO - https://doi.org/10.1007/s10934-010-9358-4 SN - 1380-2224 SN - 1573-4854 VL - 18 IS - 1 SP - 83 EP - 88 PB - Kluwer CY - Dordrecht AN - OPUS4-22977 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER -