Intensified Sintering of Lithium Aluminosilicate Ceramics

Non-isothermal sinter-crystallization of jagged Li2O–Al2O3–SiO2 glass and simulation using a modified form of the Clusters model

“…Suzdal'tsev et al [22,23] reported that the sintering of a LAS-based glass could be accelerated by adding 0.1-0.7 wt.% Cr 2 O 3 . GCs with only 0.1-0.2% residual porosity were obtained by slip casting the glass powders and then heating them.…”

“…However, most crystallizable glass powders are difficult to sinter because the large surface area for nucleation [12] and the premature surface crystallization of the glass particles hamper effective sintering by viscous flow, which is necessary to achieve full density [13]. While the traditional thermal treatment of internally nucleated GCs is well-established in industrial manufacturing [4,14], optimizing sintered GCs for commercial production is still an on-going process.…”

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

“…[200,201], Suzdal’tsev et al . [202,203], Guedes et al . [126] which were not successful in making material with near theoretical density.…”

“…This route benefits from the general ceramic shaping techniques namely, dry pressing, extrusion, injection moulding, slip-casting and tape casting etc. Before 2009, there were several efforts by Knickerbocker et al [199], Sung [165], Wang et al [200,201], Suzdal'tsev et al [202,203], Guedes et al [126] which were not successful in making material with near theoretical density. While processing glass-ceramic from powders or frits, the surface imperfections in the glass powder/ frits act as heterogeneous sites for nucleation, and it may not require additional nucleating agents.…”

New Sintered Li2O–Al2O3–SiO2 Ultra‐Low Expansion Glass‐Ceramic

“…Although there are some published works on the sintering of LAS glass‐ceramics, the major problem with this process achieving complete densification if a crystallized fraction higher than 60% is desired remains unsolved …”