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MIT professor develops method to verify compliance with Outer Space Treaty
Danagoulian
Areg Danagoulian of the Department of Nuclear Science and Engineering at the Massachusetts Institute of Technology is proposing a mechanism for verifying that Earth-orbiting satellites are in compliance with the Outer Space Treaty, which prohibits the placement of nuclear weapons in space. Danagoulian’s “concept and feasibility study,” titled “Verification of the Outer Space Treaty with cosmic protons,” was published recently in the journal Nature.
Mirco Karl Grosse (KIT), Teun van Duijnhoven (KIT/FONTYS Univ of Applied Sciences), Martin Steinbrueck, Chongchong Tang, Sarfraz Ahmed, Uta Gerhards, Ingo Juergen Markel, Hans Juergen Seifert (KIT)
Proceedings | 2018 International Congress on Advances in Nuclear Power Plants (ICAPP 2018) | Charlotte, NC, April 8-11, 2018 | Pages 590-597
Stacked couples of silicon carbide and Zircaloy-4 discs were annealed for 1 h in nominal inert atmosphere (6N Ar) at temperatures of 1200, 1400, 1500, 1550, 1575 and 1600°C. Strong interactions between silicon carbide and Zircaloy-4 occurred at temperatures of 1500°C and above. The width of the influenced zone exceeds 1 mm at 1550°C. A pronounced layer structure was found consisting of Zr-Si intermetallic compounds with different stoichiometry, the Zr-Sn intermetallic phase Zr2Sn and sub-stoichiometric ZrC1-x. The six different layers formed at temperatures of 1500°C and above contain these phases in diverse concentrations. At temperatures of 1575 and 1600°C, the discs welded together. This paper gives a detailed description of the results of the post-annealing examinations and an analysis of the interaction between the two materials.
