材料科学
复合材料
纤维
极限抗拉强度
复合数
降级(电信)
陶瓷
热稳定性
冶金
电子工程
化学工程
工程类
作者
C. Milz,J. Goering,Hartmut Schneider
出处
期刊:Ceramic engineering and science proceedings
日期:2008-03-26
卷期号:: 191-198
被引量:17
标识
DOI:10.1002/9780470294567.ch23
摘要
Nextel™ 720 fibers and their suitability for high-temperature (HT) applications in CMCs were analyzed at temperatures ranging from 900° to 1300°C. The thermal stability of the Nextel™ 720 fibers was characterized by single-fiber tensile tests at various temperatures after heat treatments up to 1300°C. In addition to bulk fiber grain growth resulting from heat treatment at T > 1200°C, a locally-catastrophic degradation of the fiber material occurred during heat treatment at 1300°C. This degradation was caused by locally enriched impurities and had a mean spacing of 135mm [1]. The subcritical crack growth (SCG) was determined using the dynamic fatigue method. At 900°C no SCG could be detected while at 1000°C (N=18) and at 1100°C (N=9.4) intensive SCG was found. Nevertheless the locally catastrophic degradation as well as the intense SCG has only a minor influence on the use of Nextel™ 720 fibers in a ceramic composite; this due to low values (between 0.34 and 15.2 mm) of the fiber length relevant to composite failure.
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