1984/01/01 by Xie, Yu-shen, Xie, Yu-Shen, Brückner, Rolf
Engineering · Materials Science · #660 #Advanced ceramic materials synthesis #Chemical Looping and Thermochemical Processes #Glass properties and applications
paper · doi:10.34657/14432
openalex publication_date 1984/01/01 · openalex created_date 2016/09/16 · openalex updated_date 2026/07/01
Phase separation of glasses of compositions (mole %) 12,5 Na2O; 12,5 CaO; 75 SiO2 and 10 Na2O; 10 CaO; 80 SiO2 was studied after heat treatments for different times at 650 °C, 760 °C or both. The morphology in the spinodal and binodal regions as well as at the boundary of the phase separation region is described. In the binodal region a typical Ostwald ripening was found which was much restricted by the high viscosity. Towards the boundaries of the immiscibility range great changes in phase separation are produced by relatively small changes in chemical composition caused by crystallization or the evaporation of components at high temperature. Elastic, shear and compression moduli as well as Poisson's ratio were measured by ultra sonic impulse and the bending strength of the glasses determined by three and four point loading; the transformation temperature Tg and density were also measured. Metastable binodal phase separation gave results different from those for spinodal separation. The properties also depend on the extent and texture of phase separation in a characteristic way.