Sulfur segregation to oxide/metal interfaces: a comparison of thermally grown and plasma deposited Al{sub 2}O{sub 3}

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Segregation of S to oxide/metal interfaces was studied using scanning Auger microscopy after removing the oxide film in ultrahigh vacuum. Two types of alumina films were investigated: one formed from oxidation at 1000 C on Fe-28at.%Al-5at.%Cr; the other was deposited on the same alloy via plasma synthesis, where Al was codeposited with O to form an amorphous Al2O3 film, 0.2 or 0.8 {mu}m thick. Subsequent heat treatment of the deposited film at 1000 C caused it to slowly transform to {alpha}-Al2O3, and the transformation took place at the film/alloy interface. S segregated to the interface during heat treatment. The amount ... continued below

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16 p.

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Hou, P.Y.; Wang, Z.; Pruessner, K.; Alexander, K.B. & Brown, I.G. September 1, 1996.

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Segregation of S to oxide/metal interfaces was studied using scanning Auger microscopy after removing the oxide film in ultrahigh vacuum. Two types of alumina films were investigated: one formed from oxidation at 1000 C on Fe-28at.%Al-5at.%Cr; the other was deposited on the same alloy via plasma synthesis, where Al was codeposited with O to form an amorphous Al2O3 film, 0.2 or 0.8 {mu}m thick. Subsequent heat treatment of the deposited film at 1000 C caused it to slowly transform to {alpha}-Al2O3, and the transformation took place at the film/alloy interface. S segregated to the interface during heat treatment. The amount increased with heat treatment time but was much less than that with scales formed by oxidation. Not all the film/alloy interfaces contained S; the behavior was different from the uniform S coverage found under thermally grown scales. S segregation to the film/alloy interface seems to be controlled by availability of interfacial sites rather than bulk diffusion rates.

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16 p.

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OSTI as DE97001222

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  • 3. international conference on microscopy of oxidation, Cambridge (United Kingdom), 16-18 Sep 1996

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  • Other: DE97001222
  • Report No.: LBNL--39351
  • Report No.: CONF-960928--2
  • Grant Number: AC03-76SF00098;AC05-84OR21400
  • Office of Scientific & Technical Information Report Number: 436361
  • Archival Resource Key: ark:/67531/metadc684771

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  • September 1, 1996

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  • July 25, 2015, 2:20 a.m.

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  • Aug. 4, 2016, 7:07 p.m.

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Hou, P.Y.; Wang, Z.; Pruessner, K.; Alexander, K.B. & Brown, I.G. Sulfur segregation to oxide/metal interfaces: a comparison of thermally grown and plasma deposited Al{sub 2}O{sub 3}, article, September 1, 1996; California. (digital.library.unt.edu/ark:/67531/metadc684771/: accessed September 20, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.