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首页> 外文期刊>Materials Science and Engineering >Fatigue behavior of a Hi-Nicalon~(TM)SiC-B_4C composite at 1200℃ in air and in steam
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Fatigue behavior of a Hi-Nicalon~(TM)SiC-B_4C composite at 1200℃ in air and in steam

机译：Hi-Nicalon〜（TM）SiC-B_4C复合材料在1200℃的空气和蒸汽中的疲劳行为

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摘要

Effects of steam environment on fatigue behavior of a non-oxide ceramic composite with a multilayered matrix were investigated at 1200℃. The composite was produced via chemical vapor infiltration (CVI). The composite had an oxidation inhibited matrix, which consisted of alternating layers of silicon carbide and boron carbide and was reinforced with laminated woven Hi-Nicalon~(TM) fibers. Fiber preforms had pyrolytic carbon fiber coating with boron carbon overlay applied. Tensile stress-strain behavior and tensile properties were evaluated at 1200℃ Tension-tension fatigue tests were conducted at 0.1 Hz and at 1.0 Hz for fatigue stresses ranging from 100 to 140 MPa in air and in steam. Fatigue run-out was defined as 10~5 cycles at 0.1 Hz and as 2 × 10~5 cycles at 1.0 Hz. Presence of steam had little influence on fatigue performance at 1.0 Hz, but noticeably degraded the fatigue lifetimes at 0.1 Hz. Specimens that achieved run-out were subjected to tensile tests to failure to characterize the retained tensile properties. Prior fatigue in air and in steam caused significant reduction in tensile strength and modulus. Composite microstructure, as well as damage and failure mechanisms were investigated.
机译：研究了在1200℃下蒸汽环境对具有多层基质的非氧化物陶瓷复合材料疲劳行为的影响。该复合材料是通过化学气相渗透（CVI）生产的。该复合材料具有抑制氧化的基质，该基质由碳化硅和碳化硼的交替层组成，并用层压机织的Hi-NicalonTM纤维增强。纤维预成型件具有热解碳纤维涂层，并涂有硼碳涂层。在1200℃时评估了拉伸应力-应变行为和拉伸性能。在空气和蒸汽中100至140 MPa的疲劳应力下，在0.1 Hz和1.0 Hz下进行了拉伸疲劳试验。疲劳跳动定义为0.1 Hz时10〜5个周期和1.0 Hz时2×10〜5个周期。蒸汽的存在对1.0 Hz时的疲劳性能几乎没有影响，但明显降低了0.1 Hz时的疲劳寿命。对达到跳动的样品进行拉伸测试，以表征保留的拉伸性能。先前在空气和蒸汽中的疲劳导致抗张强度和模量显着降低。研究了复合材料的微观结构，以及破坏和破坏机理。

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