Effects of high-temperature environments on flaw generation and fracture behavior of SiC/SiC composites
Effects of high-temperature environments on flaw generation and fracture behavior of SiC/SiC composites
复制标题
高温环境对SiC/SiC复合材料缺陷产生和断裂行为的影响
DOI：
10.1016/0921-5093(95)10117-9
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发表时间：
1995
期刊：
影响因子：
--
通讯作者：
Dileep Singh
中科院分区：
文献类型：
--
作者：
J. Singh;Dileep Singh
高温对Nicalon纤维增强SiC基复合材料的裂纹产生和断裂行为有重要影响。我们通过在800至1300 °C范围内的几个温度下测量强度以及微观结构表征来评估效果。复合材料的强度从室温下的400 MPa增加到800 °C下的532 MPa，而在1300 °C下降低到270 MPa。这种复合材料强度在高温下的退化被认为与纤维退化有关。在室温和高温下测试的复合材料中的原位纤维强度通过断口分析技术进行估计。复合材料中纤维的原位强度明显低于原态纤维。这种减少被认为与加工过程中产生的缺陷和暴露于高温服务环境有关。
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.