Engineered high expansion glass-ceramics having near linear thermal strain and methods thereof
| DWPI Title: Preparation of glass-ceramic composition for electrical connections involves heating glass-ceramic mixture configured to provide glass-ceramic composition containing e.g. silica and zinc oxide, rapidly cooling, reheating, and cooling |
| 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: Preparation of glass-ceramic composition for electrical connections (e.g., in co-axial single pin or multiple-pin connectors, and headers), such as electrical connectors with hermetic seals used in aerospace applications, including communications satellites, microwave communications equipment, and military communications and radar systems; the automotive industry; and commercial communications. |
| Advantage: The improved glass-ceramic (GC) composition exhibits high coefficient of thermal expansion (CTE) and a near linear thermal strain. |
| Novelty: A glass-ceramic composition is prepared by providing glass-ceramic mixture configured to provide a glass-ceramic composition containing 65-80 wt.% silica (SiO2), 8-16 wt.% lithium oxide, 2-8 wt.% alumina, 1-8 wt.% potassium oxide, 1-5 wt.% phosphorus pentoxide, 0.5-7 wt.% boron oxide, and 0.1-5 wt.% zinc oxide; heating the mixture to 950-1050° C; rapidly cooling to 400-750° C to minimize formation of a cristobalite SiO2 phase within the mixture; reheating the mixture to 750-850° C to facilitate formation of quartz SiO2 phase within the mixture; and cooling the mixture to 10-500° C. |
| Filed: 9/12/2017 |
| Application Number: US15701893A |
| Tech ID: SD 13230.1 |
| 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. |
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