Skip to main content
U.S. Department of Energy
Office of Scientific and Technical Information

Glass-ceramics for lightning arrestor connector seals

Technical Report ·
OSTI ID:5373056
High dielectric constant glass-ceramics were developed for the use in lightning arrestor connectors. Ferroelectric glass-ceramics were formulated in the Na/sub 2/O.Nb/sub 2/O/sub 5/.Al/sub 2/O/sub 3/.SiO/sub 2/ and Bi/sub 2/O/sub 3/.TiO/sub 2/.B/sub 2/O/sub 3/ systems. The most effective nucleating agents for producing NaNbO/sub 3/ in the Na/sub 2/O.Nb/sub 2/O/sub 5/.Al/sub 2/O/sub 3/.SiO/sub 2/ system were SiC and Si. Glass-ceramics based on this sytem have a fine-grained structure, zero porosity when heat-treated in air, and dielectric constants at 100 kHz of up to 70. Glass-ceramics in the Bi/sub 2/O/sub 3/.TiO/sub 2/.B/sub 2/O/sub 3/ system contain the ferroelectric Bi/sub 4/(TiO/sub 4/)/sub 3/ phase. These glass-ceramics have dielectric constants of 85 which are frequency independent in the 10/sup 2/ to 10/sup 5/ Hz region. Upon crystallization, virtually all of the TiO/sub 2/ is in the Bi/sub 4/(TiO/sub 4/)/sub 3/ phase. The formation of hermetic seals in an Ar atmosphere was hampered by porosity.
Research Organization:
Sandia Labs., Albuquerque, NM (USA)
DOE Contract Number:
AC04-76DP00789
OSTI ID:
5373056
Report Number(s):
SAND-80-0215
Country of Publication:
United States
Language:
English