Engineered high expansion glass-ceramics having near linear thermal strain and methods thereof

DWPI Title: Glass-ceramic composition for hermetic seal used in e.g. aerospace applications has oxides of aluminum, potassium, phosphorous, boron, and zinc, and silicon oxide in cristobalite phase and silicon oxide in quartz phase
Abstract: The present invention relates to glass-ceramic compositions, as well as methods for forming such composition. In particular, the compositions include various polymorphs of silica that provide beneficial thermal expansion characteristics (e.g., a near linear thermal strain). Also described are methods of forming such compositions, as well as connectors including hermetic seals containing such compositions.
Use: Glass-ceramic composition for hermetic seals used in aerospace applications, such as communications satellites, microwave communications equipment. Can also be used in military communications, radar systems, automotive industry and commercial communications.
Advantage: Exhibits high coefficient of thermal expansion (CTE) and a near linear thermal strain by including controlled amounts of quartz and cristobalite phases.
Novelty: The glass-ceramic composition has 65-80 wt.% silicon oxide, 8-16 wt.% lithium oxide, 2-8 wt.% aluminum oxide, 1-8 wt.% potassium oxide, 1-5 wt.% phosphorous oxide, 0.5-7 wt.% boron oxide, and 0.1-5 wt.% zinc oxide. The composition further includes 5-30 wt.% silicon oxide in cristobalite phase and 5-30 wt.% silicon oxide in a quartz phase.
Filed: 8/25/2015
Application Number: US14834616A
Tech ID: SD 13230.0
This invention was made with Government support under Contract No. DE-NA0003525 awarded by the United States Department of Energy/National Nuclear Security Administration. The Government has certain rights in the invention.
Data from Derwent World Patents Index, provided by Clarivate
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