The crystallisation of glasses based on the binary wollastonite-lithium silicate system & natural raw materials has been investigated, including the influence of both TiO2 & Cr2O3 on the crystallisation kinetics. Wollastonite CaSiO3, lithium metasilicate Li2SiO3, lithium calcium silicate Li2Ca3Si6O16, lithium disilicate Li2Si2O5, quartz & cristobalite were formed at temperatures between 800-1100C. Higher TiO2- contents enhance the formation of Li-disilicate which then disappears at temperatures >900C. Lithium calcium silicate was formed at temperatures >800C, however, it decomposes into 3CaSiO3+ Li2SiO3+ 2SiO2, at temperatures >900C. Wollastonite & Li-metasilicate were stable in the 800-1100C temperature range.
Origin
King Abdulaziz City For Science & Technology, Saudi Arabia
Journal Title
Glass Technology February 2007 Volume 48 1 35-40
Sector
Special Glass
Class
S 3305