Effects of high-temperature environments on flaw generation and fracture behavior of SiC/SiC composites

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Flaw generation and fracture behavior of Nicalon-fiber-reinforced SiC matrix composites are influenced by high temperatures. Therefore, the authors evaluated the effects of temperature by measuring the strength of these composites at several temperatures ranging from 800 to 1,300 C, and by characterizing their microstructure. While composite strength increased from {approx}400 MPa at room temperature to {approx}532 MPa at 800 C, it decreased to {approx}270 MPa at 1,300 C. Such degradation of composite strength at high temperature is believed to be partly due to fiber degradation. In-situ fiber strength of composites tested at room and elevated temperatures was estimated by fractographic ... continued below

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8 p.

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Singh, J.P. & Singh, D. February 1, 1995.

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Description

Flaw generation and fracture behavior of Nicalon-fiber-reinforced SiC matrix composites are influenced by high temperatures. Therefore, the authors evaluated the effects of temperature by measuring the strength of these composites at several temperatures ranging from 800 to 1,300 C, and by characterizing their microstructure. While composite strength increased from {approx}400 MPa at room temperature to {approx}532 MPa at 800 C, it decreased to {approx}270 MPa at 1,300 C. Such degradation of composite strength at high temperature is believed to be partly due to fiber degradation. In-situ fiber strength of composites tested at room and elevated temperatures was estimated by fractographic techniques. The in-situ strength of fibers in composites was significantly lower than that of as-received fibers. This decrease is believed to be related to flaws that develop during processing and to exposure to elevated-temperature service environments.

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8 p.

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OSTI as DE95008270

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  • 5. international conference on the science of hard materials, Maui, HI (United States), 20-24 Feb 1995

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  • Other: DE95008270
  • Report No.: ANL/ET/CP--83155
  • Report No.: CONF-950245--1
  • Grant Number: W-31109-ENG-38
  • DOI: 10.2172/28388 | External Link
  • Office of Scientific & Technical Information Report Number: 28388
  • Archival Resource Key: ark:/67531/metadc670046

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  • February 1, 1995

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  • June 29, 2015, 9:42 p.m.

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  • Dec. 15, 2015, 6:53 p.m.

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Singh, J.P. & Singh, D. Effects of high-temperature environments on flaw generation and fracture behavior of SiC/SiC composites, report, February 1, 1995; Illinois. (digital.library.unt.edu/ark:/67531/metadc670046/: accessed September 23, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.