STUDY OF LITHIUM ALUMINUM SILICATE GLASS CRYSTALLIZATION
IN THE RANGE 825 – 875°C
E. I. Suzdal’tsev
and A. S. Ermolaev
Translated from Novye Ogneupory, No. 1, pp. 42 – 45, January 2015.
Original article submitted November 7, 2014.
Results are provided for a study of lithium aluminium silicate glass crystallization in the range 825 – 875°C.
Keywords: glass ceramic, crystallization, lithium aluminium silicate glass, x-ray-phase analysis (XPA).
Ceramic technology is used currently in ONPP
Tekhnologiya for preparing objects of glass ceramics
OTM-357 and OTM-357-O (main phase b-spodumene)
[1 – 4]. According to this technology objects are molded
from amorphous and previously crystallized lithium alu-
minium silicate glass respectively. Use of previously crystal-
lized lithium aluminium silicate glass makes it possible to re-
duce heat treatment duration from 70 to 24 – 30 h. Since
prior crystallization of lithium aluminium silicate glass is
performed at 1170 – 1250°C for 4–8h this requires addi-
tional use of high-temperature firing furnaces and increases
firing time for a single object up to 10 h.
Results are provided in  for a study of the possibility
of reducing prior crystallization for an original lithium alu
minium silicate glass and its use for manufacturing objects
for radio engineering purposes. In addition, the possibility of
demonstrated of using material previously crystallized at
850 – 900°C for preparing lithium aluminium silicate glass
workpieces, which provides a reduction in the level of glass
heat treatment temperature from 1180 – 1250 to
850 – 900°C. As a result of this a possibility develops of not
performing heat treatment within high-temperature firing
furnaces, but in low-temperature (up to 1000°C) furnaces
with reduced heat treatment duration. Results obtained 
point to a requirement for more profound study in the area of
original glass crystallization in the range 850 – 900°C.
Crystallization processes for lithium aluminium silicate
glass have been studied in a DRON-6 x-ray diffractometer by
means of a PDWIN program and in an EVO-40 XVP scan
ning electron microscope (SEM). Standard methods, instru
ments, and units were used in order to determine ceramic
Refractories and Industrial Ceramics Vol. 56, No. 1, May, 2015
1083-4877/15/05601-0039 © 2015 Springer Science+Business Media New York
OAO Obninsk Scientific-Production Enterprise Tekhnologiya,
Fig. 1. XPA results for specimens heat treated at 825 (a), 850 (b )
and 875°C (c): 1 ) b-eucryptite; 2 ) alumotitanate.