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
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Related Subjects
36 MATERIALS SCIENCE
360201* -- Ceramics
Cermets
& Refractories-- Preparation & Fabrication
ALKALI METAL COMPOUNDS
ALUMINIUM COMPOUNDS
ALUMINIUM OXIDES
BISMUTH COMPOUNDS
BISMUTH OXIDES
BORON COMPOUNDS
BORON OXIDES
CHALCOGENIDES
CHEMICAL COMPOSITION
CONDUCTOR DEVICES
CONNECTORS
CRYSTAL STRUCTURE
CRYSTALLIZATION
DIAGRAMS
ELECTRICAL EQUIPMENT
EQUIPMENT
FABRICATION
HEAT TREATMENTS
LIGHTNING ARRESTERS
MICROSTRUCTURE
NIOBIUM COMPOUNDS
NIOBIUM OXIDES
OXIDES
OXYGEN COMPOUNDS
PHASE DIAGRAMS
PHASE TRANSFORMATIONS
PRODUCTION
SEALS
SILICON COMPOUNDS
SILICON OXIDES
SODIUM COMPOUNDS
SODIUM OXIDES
TEMPERATURE DEPENDENCE
TITANIUM COMPOUNDS
TITANIUM OXIDES
TRANSITION ELEMENT COMPOUNDS
360201* -- Ceramics
Cermets
& Refractories-- Preparation & Fabrication
ALKALI METAL COMPOUNDS
ALUMINIUM COMPOUNDS
ALUMINIUM OXIDES
BISMUTH COMPOUNDS
BISMUTH OXIDES
BORON COMPOUNDS
BORON OXIDES
CHALCOGENIDES
CHEMICAL COMPOSITION
CONDUCTOR DEVICES
CONNECTORS
CRYSTAL STRUCTURE
CRYSTALLIZATION
DIAGRAMS
ELECTRICAL EQUIPMENT
EQUIPMENT
FABRICATION
HEAT TREATMENTS
LIGHTNING ARRESTERS
MICROSTRUCTURE
NIOBIUM COMPOUNDS
NIOBIUM OXIDES
OXIDES
OXYGEN COMPOUNDS
PHASE DIAGRAMS
PHASE TRANSFORMATIONS
PRODUCTION
SEALS
SILICON COMPOUNDS
SILICON OXIDES
SODIUM COMPOUNDS
SODIUM OXIDES
TEMPERATURE DEPENDENCE
TITANIUM COMPOUNDS
TITANIUM OXIDES
TRANSITION ELEMENT COMPOUNDS