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Electronic Resource
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SAND Report: SAND87-1753, December 1987.
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Library's review
ABSTRACT:
Metals for potential use in the dissociator and the synthesizer reactors of a distributed solar-receiver, thermochemical-transport loop using SO,/SO,/O, molecular chemistry were tested in SO, gas at 500°C and 9OO"C, respectively, for periods up to 8 weeks and in a cyclic-temperature mode
Metals for potential use in the dissociator and the synthesizer reactors of a distributed solar-receiver, thermochemical-transport loop using SO,/SO,/O, molecular chemistry were tested in SO, gas at 500°C and 9OO"C, respectively, for periods up to 8 weeks and in a cyclic-temperature mode
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from 200°C to 9OO"C, representing the diurnal solar cycle, for 35 days. They included iron base, nickel-base, and cobalt-base super alloys. Weight-gain measurements were used to determine the oxidation/sulfidation kinetics. Electron-microprobe analysis identified any possible penetration of oxygen and sulfur into the metal and the formation of internal oxides and sulfides. Selected iron-base, nickel-base, and cobalt-base alloys look promising as candidates for the synthesizer reactor which operates at - 500°C. The most promising candidate for the dissociator reactor that operates above 900°C is Kanthal A-1, which contains sufficient quantities of both aluminum and chromium alloying additions to be an alumina and chromia former. Show Less