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Effectiveness of Diffusion Barrier Coatings for Mo-Re Embedded in C/Sic and C/C

Effectiveness of Diffusion Barrier Coatings for Mo-Re Embedded in C/Sic and C/C

          
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About the Book

Advanced high-temperature cooling applications may often require the elevated-temperature capability of carbon/silicon carbide or carbon/carbon composites in combination with the hermetic capability of metallic tubes. In this paper, the effects of C/SiC and C/C on tubes fabricated from several different refractory metals were evaluated. Though Mo, Nb, and Re were evaluated in the present study, the primary effort was directed toward two alloys of Mo-Re, namely, arc cast Mo-41Re and powder metallurgy Mo-47.5Re. Samples of these refractory metals were subjected to either the PyC/SiC deposition or embedding in C/C. MoSi2(Ge), R512E, and TiB2 coatings were included on several of the samples as potential diffusion barriers. The effects of the processing and thermal exposure on the samples were evaluated by conducting burst tests, microhardness surveys, and scanning electron microscopic examination (using either secondary electron or back scattered electron imaging and energy dispersive spectroscopy). The results showed that a layer of brittle Mo-carbide formed on the substrates of both the uncoated Mo-41Re and the uncoated Mo-47.5Re, subsequent to the C/C or the PyC/SiC processing. Both the R512E and the MoSi2(Ge) coatings were effective in preventing not only the diffusion of C into the Mo-Re substrate, but also the formation of the Mo-carbides. However, none of the coatings were effective at preventing both C and Si diffusion without some degradation of the substrate.Glass, David E. and Shenoy, Ravi N. and Wang, Zeng-Mei and Halbig, Michael C.Glenn Research Center; Langley Research CenterPROTECTIVE COATINGS; CARBON-CARBON COMPOSITES; RHENIUM; FABRICATION; REFRACTORY METALS; POWDER METALLURGY; SILICON CARBIDES; MOLYBDENUM CARBIDES; DIFFUSION; HERMETIC SEALS; DEGRADATION; SUBSTRATES; TITANIUM BORIDES; BURST TESTS; SCANNING ELECTRON MICROSCOPY; HIGH TEMPERATURE; MICROHARDNESS...


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Product Details
  • ISBN-13: 9781723829871
  • Publisher: Independently Published
  • Publisher Imprint: Independently Published
  • Height: 280 mm
  • No of Pages: 48
  • Spine Width: 3 mm
  • Width: 216 mm
  • ISBN-10: 1723829870
  • Publisher Date: 19 Sep 2018
  • Binding: Paperback
  • Language: English
  • Returnable: N
  • Weight: 136 gr


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