This study presents results and analysis of selection
criteria for SiC package sealing using glasses aimed for
high temperature applications. Three commercial glasses
were tested: an alkaline earth aluminosilicate glass
(Corning 1723) and two glass transfer tapes G-1004
and G-1005, consisting of a glass frit layer attached to
a plastic carrier film, obtained from Vitta Corporation.
They were chosen because of their matched CTE with
SiC (43 · 107
K1
). The working temperatures of
these three glasses are lower than the melting point of
the electrical contact materials usually employed so that
there would be little disturbance when the joining operation
is carried out. The glass Corning 1723 was previously
tested (e.g., [12–14]) in composite applications
because of its ease of processing and possible wide variations
in process conditions. None of these cited studies
reported the chemical compatibility of the glass with
SiC. This present study provides thermodynamic calculations
that were made in order to predict the stability of
glass components with SiC. These results provide valuable
information that could be used to predict stable glass
compositions and tailor suitable glasses for the desired
application.