Stress-temperature-lifetime response of nicalon fiber-reinforced SiC composites in air

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Time-to-failure tests were conducted in four-point flexure and in air as a function of stress levels and temperatures to study the lifetime response of various Nicalon fiber-reinforced SiC (designated as Nic/SiC) composites with a graphitic interfacial coating. The results indicated that all of the Nic/SiC composites exhibit a similar stress-dependent failure at applied stress greater than a threshold value. In this case, the lifetimes of the composites increased with decrease in both stress level and test temperature. The lifetime of the composites appeared to be relatively insensitive to the thickness of graphitic interface layer and was enhanced somewhat by the ... continued below

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13 p.

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Lin, Hua-Tay & Becher, P. F. February 1996.

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Description

Time-to-failure tests were conducted in four-point flexure and in air as a function of stress levels and temperatures to study the lifetime response of various Nicalon fiber-reinforced SiC (designated as Nic/SiC) composites with a graphitic interfacial coating. The results indicated that all of the Nic/SiC composites exhibit a similar stress-dependent failure at applied stress greater than a threshold value. In this case, the lifetimes of the composites increased with decrease in both stress level and test temperature. The lifetime of the composites appeared to be relatively insensitive to the thickness of graphitic interface layer and was enhanced somewhat by the addition of oxidation inhibitors. Electron microscopy and oxidation studies indicated that the life of the Nic/SiC composites was governed by the oxidation of the graphitic interfaces and the on of glass(es) in composites due to the oxidation of the fiber and matrix, inhibitor phases.

Physical Description

13 p.

Notes

INIS; OSTI as DE96005478

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  • 20. annual conference on composites, advanced ceramics, materials and structures-B, Cocoa Beach, FL (United States), 7-11 Jan 1996

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  • Other: DE96005478
  • Report No.: CONF-960106--1
  • Grant Number: AC05-84OR21400
  • Office of Scientific & Technical Information Report Number: 219399
  • Archival Resource Key: ark:/67531/metadc665997

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Office of Scientific & Technical Information Technical Reports

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  • February 1996

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  • June 29, 2015, 9:42 p.m.

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  • Jan. 21, 2016, 12:35 p.m.

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Lin, Hua-Tay & Becher, P. F. Stress-temperature-lifetime response of nicalon fiber-reinforced SiC composites in air, article, February 1996; Tennessee. (digital.library.unt.edu/ark:/67531/metadc665997/: accessed October 24, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.