Cryogenic feedthrough seals for rockets
- Publisher
- Elsevier Science
- Year
- 1996
- Tongue
- English
- Weight
- 120 KB
- Volume
- 1996
- Category
- Article
- ISSN
- 1350-4789
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โฆ Synopsis
High conductivity glass sealing wires developed
A line of copper -cored glass sealing alloy wires that feature a strong and ductile hermetic metallurgical bond between the metals and a smaller overall diameter with a higher conductivity than solid wires is being introduced by Anomet Products.
Available as Alloy 52 Nickel-Iron and Kovar Nickel-Iron-Cobalt the glass sealing wires have a 3: 1 ratio of the alloy to the diameter of the copper core.
Providing a smaller conductor than solid wire with the same power requirements, the wires are ideally suited for use in connectors and hermetic devices. Supplied in 0.5 mm to 4 mm sizes with the temper and surface finish to spec. They exhibit 14% IACS and 12 pL2 cm resistivity.
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Table 1 Pumping speeds of the cryopump for H 2 and Ar with the cold trap at 4.2 K and 2.2 K respectively (Pumping speeds of N 2 and dry air are equal to those of Ar within 10%) Pumping speed, I s "1 Gas 4,2 K 2.2 K H 2 4 000 5 200 Ar 1 000 1 000 gas molecules even for low values of the sticking pro