The utilization of rare earth tailing for the production of glass-ceramics

摘要

A new glass-ceramic was synthesized by adding rare earth tailing in traditional glass. The glass transition temperature, glass crystallization temperature, activation energy of crystal growth and the microstructures of the glass-ceramics were investigated by DSC, XRD and SEM. The results show that the crystallization peak of the glass-ceramics becomes sharper and shifts to lower temperature with increasing tailing content. Additionally, the addition of the tailing leads to a clear decrease of the size of precipitated crystals, and the crystal sizes of the sample containing 50% tailing are in a range of 30-70 nm. The activation energy of the crystal growth of the glass-ceramics declines with rising tailing percent. And the activation energies of the samples with tailing percents of 30, 50 and 70wt.% are 310, 439 and 376 kJ mol~(-1), respectively. The Avrami constants of these samples were calculated as 2.3, 3.2 and 3.3, which indicate two-dimensional growth and bulk crystallization. The major crystalline phases were identified as anorthite and diopside.