Zirconia Solubility in Boroaluminosilicate Glass Page: 4 of 10
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MgO
Sintered
.iq.dCeramic
Forsterite
Liquid
Liquid Zircon
Na2 0 ZrO2
Figure 1. Isothermal (1200 C) compositional surface of liquid
(glass), liquid+crystals (glass-ceramic), and sintered ceramic,
as projected from the (64.28 wt%SiO2-28.57 wt%B203-7.14 wt%A1203)
base glass on the glass modifiers plane (Na20-MgO-ZrO2).
The liquid field is delineated by the zirconia and magnesia
solubility limits. The maximum solubility of zirconia is 12
weight% and is observed along the zirconia-soda join. From
this point the phase boundary evolves with MgO addition and a
corresponding decrease in zirconia to 7 weight% in the liquid.
Similarly, the maximum solubility for MgO is 9 weight% along
the soda-magnesia join. But the boundary evolves into the
ternary with increase in MgO solubility to 11%. The two phase
boundaries join to define the forsterite+liquid and
zircon+liquid fields. The microscopic examination of polished
thin sections under transmitted polarized light reveals
euhedral to subhedral outlines for zircon and forsterite,
although these crystals occur clustered. The glass matrix is
devoid of unreacted phases or crystallite stars and is
isotropic under crossed polars. The homogeneity of the glass
and its equilibration with the crystals is further supported by
the results of a separate sintering experiment. For one of the
batches the reaction scheme is as follows:
16.5%MgO+12%Na20+1.5%ZrO2+5%A203+45%SiO2+20%B203 - 900 C -
Mg2B205 + MgSiO3 + A1203 + SiO2 + liquid phase-1 - 1000*C -
Mg2B205 + MgSiO3 + liquid phase-2 - 1100*C -
MgSiO3 + Mg2SiO4 + liquid phase-3 - 1200*C -
Mg2SiO4 + liquid phase-4.
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Raman, S. V.; Bopp, R.; Batcheller, T. A. & Yan, Q. Zirconia Solubility in Boroaluminosilicate Glass, report, December 31, 1995; Idaho Falls, Idaho. (https://digital.library.unt.edu/ark:/67531/metadc666458/m1/4/: accessed April 24, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.