Tensile creep performance of a developmental in-situ reinforced silicon nitride

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The evaluation was done between 1300 and 1425 C in ambient air. Minimum creep rate was evaluated vs tensile stress and temperature, and measured tensile creep performances of two different specimen geometries (buttonhead and dogbone - machined from same billet) were compared. This Si nitride exhibited comparable or better creep resistance than other Si nitrides described in the literature. Measured creep response of the material and lifetime were observed to be geometry dependent; the smaller cross-sectioned dogbone samples exhibited faster creep rates and shorter lives, presumably due to faster oxidation-induced damage in this geometry. The tensile creep rates and lifetimes ... continued below

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11 p.

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Wereszczak, A.A.; Kirkland, T.P.; Lin, H.T.; Ferber, M.K.; Li, C.W. & Goldacker, J.A. February 1, 1997.

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Description

The evaluation was done between 1300 and 1425 C in ambient air. Minimum creep rate was evaluated vs tensile stress and temperature, and measured tensile creep performances of two different specimen geometries (buttonhead and dogbone - machined from same billet) were compared. This Si nitride exhibited comparable or better creep resistance than other Si nitrides described in the literature. Measured creep response of the material and lifetime were observed to be geometry dependent; the smaller cross-sectioned dogbone samples exhibited faster creep rates and shorter lives, presumably due to faster oxidation-induced damage in this geometry. The tensile creep rates and lifetimes were found to be well represented by the Monkman- Grant relation between 1350 and 1425 C, with some evidence suggesting stratification of the data for the 1300 C tests and a change in dominant failure mode between 1300 and 1350 C. Lastly, values of the temperature-compensated stress exponent and activation energy for tensile creep were found to decrease by 80 and 75% in compression, respectively, illustrating anisotropic creep behavior in this Si nitride.

Physical Description

11 p.

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OSTI as DE97003105

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  • 21. annual conference and expo on composites, advanced cermics, materials and structures, Cocoa Beach, FL (United States), 12-16 Jan 1997

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  • Other: DE97003105
  • Report No.: CONF-970111--2
  • Grant Number: AC05-96OR22464
  • Office of Scientific & Technical Information Report Number: 447979
  • Archival Resource Key: ark:/67531/metadc679525

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  • February 1, 1997

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  • July 25, 2015, 2:21 a.m.

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  • Nov. 13, 2015, 11:20 p.m.

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Wereszczak, A.A.; Kirkland, T.P.; Lin, H.T.; Ferber, M.K.; Li, C.W. & Goldacker, J.A. Tensile creep performance of a developmental in-situ reinforced silicon nitride, article, February 1, 1997; United States. (digital.library.unt.edu/ark:/67531/metadc679525/: accessed August 23, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.