Processing Li2O-Al2O3-SiO2 (LAS) glass-ceramic with and without P2O5 through bulk and sintering route

Crystallization and sintering studies on an anomalous Li2O‐Al2O3‐SiO2 glass for making tunable thermal expansion ceramic

“…The heat-treatment schedule followed the conventional two-stage heat treatment where all the samples were heat treated at 873 K for 24 hours to enable nucleation process and sintered at temperatures between 1108 K and 1523 K where the heating/cooling rate was kept constant at 5 K/min. A LAS bulk glass having nucleating agents was reported to get effectively nucleated at temperature between 873 and 913 K. 25 Surface defects in the pulverized glass samples were expected to act as nucleating site. 26 Increasing the nucleation temperature close to glass transition may cause overgrowth of the nuclei or nucleation LAS crystal over the nuclei crystals and facilitate crystallization before the sintering process which can become detrimental for processing glass-ceramic through sintering route.…”

“…The method of numerical analysis of Raman spectra was suggested by Malfait and his collaborators. [23][24][25] The basic assumption of this method is that the Raman spectra are the sum of the partial Raman spectra (generated by the individual structural elements) multiplied by the abundance of these structural elements. The series of Raman spectra obtained for a series of glasses with different compositions span a linear vector space with a dimension given by a number of independent structural elements (i.e.…”

“…From our previous work, 25 it was understood that the annealing cycle employed while forming the bulk glass of P0 composition encouraged the early stages of nucleation or the nucleation process which in turn readily resulted in crystallization exotherms during DSC analysis. Similarly, current LAS glass powders readily showed crystallization exotherms.…”

Lithium aluminosilicate (LAS) glass-ceramics: a review of recent progress

“…wherein the P 2 O 5 addition was found to improve the chemical resistance of the GC and reduce the coefficient of thermal expansion (CTE) [162]. In our previous work [163], the influence of P 2 O 5 and the effect of heat treatment on CTE, while processing GC through bulk and sintering route are presented in detail.…”