article posted 18 Jan 2016
Field of studies: Material Sciences
January 2010 - Graduation with Diploma (equivalent. to MSc, overall grade "very good")
Since 02/2010 PhD student at the
Otto-Schott-Institut für Materialforschung, in the work group of Prof. Rüssel.
Thesis title: "Development and investigation of properties of high-strength Calcium Oxide-Magnesium Oxide- Aluminum Oxide-Siliciumdioxide glasses"
Melting Peaks of CMAS-Glass Melts Determined via DTA
Ulrike Veit, Christian Ruessel
Otto-Schott-Institute of Materials Research,
Fraunhoferstraße 6, 07743 Jena (Germany)
For the production of glass fibres, in most cases slowly crystallizing glasses are used.
In a glass melt for the commercial production for reinforcement, glass fibres should not
crystallize within the temperature range of drawing. Therefore the temperature
difference ΔT between the liquidus temperature and the temperature at which the glass
fibres are drawn should be chosen carefully to guarantee a smooth production process.
The liquidus temperature, the highest temperature where crystals are thermodynamically
stable in contact with the melt, was determined using the differential thermal analysis.
In earlier experiments, the melting peaks of the pre-crystallized glasses during heating with
DTA were compared with the results of the liquidus temperatures measured by a gradient
The experiments had shown that the values of DTA were comparable to the
results of the gradient furnace and differed mostly by less than 10 K from each other.
Experiments with different grain and batch sizes were done in order to examine the
effect on the melting point of the pre-crystallized glasses. Also the method was tested
on another set of glasses to test the reliability of this method.
1 U. Veit, Y. Houet, D. Laurent, C. Rüssel, Liquidus temperatures of calcium magnesium alumosilicate glass-forming compositions determined via gradient furnace and from the melting peak by differential thermal analysis,
Thermochim. Acta, 618 1-5 (2015) doi:10.1016/j.tca.2015.08.033