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

Authors
Journal
Materials Science and Engineering A
0921-5093
Publisher
Elsevier
Publication Date
Volume
209
Identifiers
DOI: 10.1016/0921-5093(95)10117-9
Keywords
  • High-Temperature Environments
  • Fracture
  • Fibres
  • Composites
  • Sic

Abstract

Abstract Flaw generation and fracture behavior in Nicalon fiber-reinforced SiC matrix composites are influenced by high temperatures. We evaluated the effects by measuring strength at several temperatures ranging from 800 to 1300 °C, and by microstructural characterization. While composite strength increased from ≈ 400 MPa at room temperature to ≈ 532 MPa at 800 °C, it decreased to ≈ 270 MPa at 1300 °C. Such degradation of composite strength at high temperature is believed to be related to fiber degradation. In-situ fiber strength in 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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