Processing and Oxidation Behavior of Nb-Si-B Intermetallics

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Single phase materials of {alpha}-Nb{sub 5}Si{sub 3}, Nb{sub 5}(Si,B){sub 3} (T2) and Nb{sub 5}Si{sub 3}B{sub x} (D8{sub 8}) in the Nb-Si-B system were prepared by powder metallurgy processing. T2 was almost fully dense, while {alpha}-Nb{sub 5}Si{sub 3} and D8{sub 8} were porous after sintering at 1900 C for 2 hours. The lattice parameters of T2 decreased linearly with the substitution of B for Si. Isothermal oxidation testing at 1000 C in flowing air indicated that the oxidation resistances of T2 and D8{sub 8} are much better than {alpha}-Nb{sub 5}Si{sub 3}, but still extremely poor compared to the boron-modified Mo{sub 5}Si{sub ... continued below

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386 Kilobytes pages

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Y.LIU; Thom, A.J.; Kramer, M.J. & Akinc, M. September 30, 2004.

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Single phase materials of {alpha}-Nb{sub 5}Si{sub 3}, Nb{sub 5}(Si,B){sub 3} (T2) and Nb{sub 5}Si{sub 3}B{sub x} (D8{sub 8}) in the Nb-Si-B system were prepared by powder metallurgy processing. T2 was almost fully dense, while {alpha}-Nb{sub 5}Si{sub 3} and D8{sub 8} were porous after sintering at 1900 C for 2 hours. The lattice parameters of T2 decreased linearly with the substitution of B for Si. Isothermal oxidation testing at 1000 C in flowing air indicated that the oxidation resistances of T2 and D8{sub 8} are much better than {alpha}-Nb{sub 5}Si{sub 3}, but still extremely poor compared to the boron-modified Mo{sub 5}Si{sub 3}. Extensive cracking in the oxide scale and matrix were observed and arose from the volume expansion associated with the formation of Nb{sub 2}O{sub 5} and boron-containing silica glass.

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386 Kilobytes pages

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OSTI as DE00832901

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  • Report No.: IS-M 924
  • Grant Number: W-7405-Eng-82
  • Office of Scientific & Technical Information Report Number: 832901
  • Archival Resource Key: ark:/67531/metadc779940

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  • September 30, 2004

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  • Dec. 3, 2015, 9:30 a.m.

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  • Jan. 2, 2018, 3:26 p.m.

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Y.LIU; Thom, A.J.; Kramer, M.J. & Akinc, M. Processing and Oxidation Behavior of Nb-Si-B Intermetallics, article, September 30, 2004; Ames, Iowa. (digital.library.unt.edu/ark:/67531/metadc779940/: accessed June 17, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.