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首页> 外文会议>ASME Turbo Expo: Turbomachinery Technical Conference and Exposition >FATIGUE OF AN ADVANCED SiC/SiC CERAMIC MATRIX COMPOSITE WITH AN ENVIRONMENTAL BARRIER COATING AT ELEVATED TEMPERATURE IN AIR AND IN STEAM
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FATIGUE OF AN ADVANCED SiC/SiC CERAMIC MATRIX COMPOSITE WITH AN ENVIRONMENTAL BARRIER COATING AT ELEVATED TEMPERATURE IN AIR AND IN STEAM

机译：高级SiC / SiC陶瓷基质复合材料的疲劳，在空气和蒸汽中升高温度下的环境阻隔涂层

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Uniaxial tension-tension fatigue performance of a SiC/SiC composite with an ytterbium-disilicate environmental barrier coating (EBC) was investigated at 1200°C in laboratory air and in steam. The composite is reinforced with Hi-Nicalon™ SiC fibers and has a melt-infiltrated matrix processed by chemical vapor infiltration of SiC followed by infiltration with SiC particulate slurry and molten Si. The EBC consists of a Si bond coat and an ytterbium disilicate (Yb_2Si_2O_7) top coat applied via air plasma spraying (APS). Basic tensile properties of the EBC/SiC/SiC composite were evaluated at 1200°C. Tension-tension fatigue was examined for maximum stresses of 110-140 MPa in air and in steam. To assess the efficacy of the EBC, experimental results obtained for the coated composite are compared to those obtained for a control composite without the EBC. Surface grit-blasting inherent in the EBC application process degrades tensile strength of the composite. However, the EBC effectively protects the composite from oxidation embrittlement during cyclic loading in air or in steam. Fatigue runout defined as survival of 200,000 cycles (55.6 h at a frequency of 1.0 Hz) was achieved at 110 MPa in air and in steam. The retained properties of pre-fatigued specimens were characterized. Composite microstructure, as well as damage and failure mechanisms were investigated. Damage and failure of the EBC/SiC/SiC composite are attributed to growth of cracks originating from numerous processing defects (voids) present in the composite interior.
机译：在1200℃下在实验室空气和蒸汽中，在1200℃下研究了单轴张力张力疲劳性能，并在1200℃下研究了ytterbium-unionalate环境屏障涂层（EBC）。用Hi-NicalOn TM SiC纤维增强复合材料，并通过SiC的化学蒸气渗透处理熔融渗透基质，然后用​​SiC颗粒浆料和熔融Si进行渗透。 EBC由Si粘结涂层和镱峰（YB_2SI_2O_7）顶部涂覆通过空气等离子体喷涂（APS）。 EBC / SiC / SiC复合材料的基本拉伸性质在1200℃下评价。检查张力张力疲劳，用于在空气和蒸汽中的110-140MPa的最大应力。为了评估EBC的功效，将用于涂覆的复合材料获得的实验结果与没有EBC的对照复合材料获得的实验结果。 EBC应用过程中固有的表面砂砾爆破使复合材料的拉伸强度降低。然而，EBC在空气或蒸汽中的环状载荷期间有效地保护复合物免受氧化脆化。疲劳跳动定义为20,000次循环的存活（55.6小时，频率为1.0Hz），在空气和蒸汽中以110MPa实现。表征了预疲劳标本的保留性质。研究了复合微观结构，以及损坏和破坏机制。 EBC / SiC / SiC复合材料的损伤和失效归因于源自复合内部中存在的许多加工缺陷（空隙）的裂缝的生长。

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