Manufacturing of Reticulated Open‐Cellular Aluminum Nitride Ceramic Foams from Aqueous AlN Suspensions1 . Issue 3 (21st November 2016) - Betke, Ulf
Abstract : Open‐celled aluminum nitride ceramic foams are prepared from aqueous suspensions of AlN powders passivated against hydrolysis by prior treatment with aluminum dihydrogenphosphate solutions. The sintering is performed with Y2 O3 as sintering aid in a conventional tube furnace at 1 650 °C under N2 . The mechanically stable cellular AlN material with a porosity of 91.8% is characterized with respect to its microstructure by SEM, confocal Raman microscopy and XRD/Rietveld analysis. The thermal conductivity is determined by TPS measurements and correlated to the porosity of the sample as well as the oxygen content of the AlN phase. Abstract : Reticulated, mechanically stable open‐celled aluminum nitride ceramic foams are prepared by the polymeric sponge replication (Schwartzwalder) technique from aqueous suspensions of moisture‐protected AlN powder. Their microstructure is characterized by XRD with Rietveld analysis, SEM and confocal Raman microscopy and correlated to the thermal conductivity determined in TPS experiments.