Hermetic electrical feedthrough comprising a Pt—Ni-based pin alloy
| DWPI Title: Hermetic electrical feedthrough for single pin or multiple-pin connectors, comprises stainless steel shell having feedthrough opening, pin comprising platinum-nickel-based ternary or higher alloy, and glass-ceramic encasing pin |
| Abstract: A combination of materials and processing parameters have been developed for hermetic seals for electrical feedthroughs in high performance applications. A glass-ceramic forms a hermetic seal between a stainless steel shell and a platinum-nickel-based (Pt—Ni) pin alloy for electrical feedthroughs. The glass-ceramic is processed to develop a coefficient of thermal expansion (CTE) slightly higher than the pin alloy but lower than the stainless steel. The seal system employing the new processing conditions and Pt—Ni-based pin alloy alleviates several problems encountered in previous seal systems and improves the hermetic connector performance. |
| Use: Hermetic electrical feedthrough for single pin or multiple-pin connectors. |
| Advantage: The invention provides higher margin with respect to partial pin melting during sealing than prior pin materials. It exhibits less interdiffusion and phase formation and, therefore, a uniform microstructure in the bulk and near the pin/glass-ceramic interface in both the pin alloy and the glass ceramic, exhibits high hardness after sealing, with measured values of 400 Knoop, maintains a compressive stress state within the glass ceramic throughout most of the temperature range from 55-500 degree Celsius, and the seal remains hermetic, even after thermal shock treatments between 55-85 degree Celsius. |
| Novelty: A hermetic electrical feedthrough comprises a stainless steel shell having a feedthrough opening, an electrical feed-through pin comprising a platinum-nickel-based ternary or higher alloy within the feedthrough, and a glass-ceramic encasing the pin and forming a hermetic seal to the shell and the pin. The stainless steel comprises an austenitic stainless steel alloy. The glass- ceramic comprises a lithium aluminosilicate glass ceramic comprising silicon dioxide, lithium oxide, aluminum oxide, phosphorus pentoxide, potassium oxide, boron trioxide, and zinc oxide. |
| Filed: 4/12/2021 |
| Application Number: US17227965A |
| Tech ID: SD 15235.1 |
| 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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