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Influence of additives (CoO, CaO, B2O3) on thermal and dielectric properties of BaO-Al2O3-SiO2 glass-ceramic sealant for OTM applications | | A.I. Borhan
; M. Gromada
; G.G. Nedelcu
; L. Leontie
; | | Date: |
13 Jul 2015 | | Abstract: | The efficiency of glass ceramic sealants plays a crucial role in high
temperature applications performance and durability, such as oxygen separation
from air. In order to develop suitable sealants, operating at about 950C,
several glass-ceramics with different compositional additives and ratios in BAS
system have been prepared and investigated. The effects of additive oxides,
CaO, CoO, B2O3, as network modifiers on the thermal and dielectric properties
of BAS glass-ceramic for further oxygen transport membrane OTM applications
were evaluated and discussed. The addition of additives has evident effects on
the main crystalline phases and physical properties of the glass-ceramics.
Among these systems, B2O3-rich BAS system, BABS, can be densified at the
sintering temperature below 700C through viscous sintering. Also, BABS shows
the lowest dilatometric softening temperature at 675C, which can be explained
by a fast densification associated with a shrinkage of 25 percents. It has
highest conductivity, a high dielectric constant of 67.8 and a loss of 0.029 at
10MHz, which provide an attractive feature for many technological applications.
The electrical results obtained for BABS glass-ceramic are consistent with the
typical requirements for an excellent sealant. However, considering all other
properties investigated, only B2O3-rich BAS meets the requirements for use as a
sealant for BSCF membrane. Low softening temperature of BABS opens more ways
for adding additives to tailor its functional properties, which enable for
using as sealant material for OTM applications. | | Source: | arXiv, 1507.3390 | | Services: | Forum | Review | PDF | Favorites | |
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