TY - JOUR A1 - Fest, Sarah Ute A1 - Reinsch, Stefan A1 - Müller, Ralf T1 - Milling, sintering and crystallization of 11BaO-25CaO-64SiO2 glass powder JF - International journal of applied glass science N2 - The crystallization of 11BaO-25CaO-64SiO2 mol% glass powders and related effects of glass powder milling have been studied by X-ray diffraction (XRD), light and scanning electron microscopy (SEM) and differential thermal analysis (DTA). Glass powders were made by ZrO2 crushing with subsequent sieving or sedimentation or alternatively made by milling with agate, corundum and tungsten carbide. Although surface crystallization was detectable during late sintering, all powders fully sintered. Wollastonite was found as primary crystal phase followed by cristobalite and sanbornite precipitation. The latter crystallization steps caused a second DTA-peak for fine powders. DTA-peak temperatures shifted to lower temperature with decreasing particle size in any case. No significant effects of milling materials on DTA-peak temperatures were evident. As an exception, however, milling in agate caused strongly decreased temperatures of the second DTA-peak. This observation can be explained by the progressive mechanical damaging, which results from the required prolonged milling time with agate due to its small materials density, and the fact that diamond made scratches did promote surface crystallization of cristobalite. The present study thus shows that even for glass powders with excellent sinterability, milling can affect microstructure evolution. KW - Glass KW - Crystallization KW - Powder preparation KW - SOFC PY - 2014 UR - http://onlinelibrary.wiley.com/doi/10.1111/ijag.12080/full DO - https://doi.org/10.1111/ijag.12080 SN - 2041-1286 SN - 2041-1294 VL - 5 IS - 3 SP - 236 EP - 247 PB - Wiley-Blackwell CY - Hoboken, NJ [u.a.] AN - OPUS4-30807 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER -