XIE Chunshuai, GUI Yongliang, WANG Yawen, SONG Chunyan, HU Binsheng
(College of Metallurgy Energy, North China University of Science and Technology, Tangshan 063009, Hebei, China)

Abstract: Parent glass was prepared successfully by the method of melting, using blast furnace slag as main source of raw materials, and SiO₂, Al₂O₃, MgO, ZnO, K₂CO₃, Na₂CO₃, TiO₂ and CaF₂ as auxiliary materials. The microstructure and high-temperature viscosity of parent glass were investigated by the Raman spectra and high-temperature melt properties tester. The results showed that with the increase of TiO₂ content in parent glass more Si⁴⁺ was replaced by Ti⁴⁺, which led to an increased amount of non-bridging oxygen and the movement of the Raman peaks to lower wave number. F- tended to occupy the place of O^2- in parent glass with the increasing of CaF₂ content. As a result,silicon oxygen tetrahedron fractured and the intensity of the Raman spectra lowered. The presence of TiO₂ and CaF₂ was beneficial for the homogeneity of parent glass due to the decreasing of the viscosity of liquid glass, but it also increased the thermal instability of parent glass,which was helpful for nucleation and crystallization of glass ceramics.
Key words: parent glass; Raman spectra; microstructure; high-temperature viscosity