Ultra purification of metals by electrotransport under outer space environmental condition. Final report, April 1, 1974--September 30, 1976. [2 x 10/sup -12/ torr]

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A space simulation chamber capable of achieving pressures of 2 x 10/sup -12/ torr (N/sub 2/) was designed, fabricated, and used to develop a preprototype electrotransport experiment. It was demonstrated that the electrotransport purification of refractory metals could be successfully performed in the noncontaminating environment of an orbiting low-density materials laboratory such as the Molecular Shield Device. The zero gravity of outer space will also be advantageous since ''grain-sliding'' will be eliminated. As a result of the various experiments, small quantities of the world's purest thorium metal were prepared and evaluated. The electrotransport sample assembly was tested in several environments ... continued below

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Pages: 162

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Schmidt, F.A.; Lunde, B.K. & Williams, D.E. January 1, 1976.

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Description

A space simulation chamber capable of achieving pressures of 2 x 10/sup -12/ torr (N/sub 2/) was designed, fabricated, and used to develop a preprototype electrotransport experiment. It was demonstrated that the electrotransport purification of refractory metals could be successfully performed in the noncontaminating environment of an orbiting low-density materials laboratory such as the Molecular Shield Device. The zero gravity of outer space will also be advantageous since ''grain-sliding'' will be eliminated. As a result of the various experiments, small quantities of the world's purest thorium metal were prepared and evaluated. The electrotransport sample assembly was tested in several environments including near-zero gravity, simulated solar radiation, coldness, and darkness, and under various pressures of a representative reactive gas. Ultrapure single crystals of ..cap alpha.. thorium were prepared and are presently being characterized. Laboratory electronics for the experiment were also developed, and a totally automatic control system was used to heat the specimen. Complete assembly and line drawings of the components of the experiment and specifications for a high-current power supply are contained in the appendices.

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Pages: 162

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Dep. NTIS, PC A08/MF A01.

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  • Report No.: IS-4125
  • Grant Number: W-7405-ENG-82
  • DOI: 10.2172/5359106 | External Link
  • Office of Scientific & Technical Information Report Number: 5359106
  • Archival Resource Key: ark:/67531/metadc1074604

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Office of Scientific & Technical Information Technical Reports

Reports, articles and other documents harvested from the Office of Scientific and Technical Information.

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Creation Date

  • January 1, 1976

Added to The UNT Digital Library

  • Feb. 4, 2018, 10:51 a.m.

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  • March 20, 2018, 8:11 p.m.

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Schmidt, F.A.; Lunde, B.K. & Williams, D.E. Ultra purification of metals by electrotransport under outer space environmental condition. Final report, April 1, 1974--September 30, 1976. [2 x 10/sup -12/ torr], report, January 1, 1976; United States. (digital.library.unt.edu/ark:/67531/metadc1074604/: accessed October 23, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.