首页> 外文会议>26th Annual Conference on Composites, Advanced Ceramics, Materials, and Structures: B Jan 13-18, 2002 Cocoa Beach, Florida >MECHANICAL PROPERTIES OF AN ENVIRONMENTAL BARRIER COATING ON A MONOLITHIC SiC SUBSTRATE AND ITS ROLE ON SUBSTRATE FAILURE BEHAVIOR
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MECHANICAL PROPERTIES OF AN ENVIRONMENTAL BARRIER COATING ON A MONOLITHIC SiC SUBSTRATE AND ITS ROLE ON SUBSTRATE FAILURE BEHAVIOR

机译:碳化硅基体上的环境障碍涂层的力学性能及其对基体破坏行为的作用

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摘要

The stress capability of a multilayer elastic environmental barrier coating on Hexoly SiC ceramic was characterized by measuring the coating modulus and failure strains. Next the influence of the coating on the failure behavior of the substrate Hexolly ceramic was determined for each of the three individual layers that constitute the coating. It was found that the Si bond coat demonstrated substantial stress capability with a modulus on the order of 137 GPa, close to that of a theoretically fully dense Si with failure strains on the order of 1100 microstrain. The bond coat appeared to dominate the modulus of the the overall coating. The coating was found to increase both the strength and Weibull modulus of the SiC ceramic. The enhanced failure resistance is attributed to the role of the coating in altering the effective flaw size and the flaw size distribution in the coated ceramic. The Si bond coat also dominated the other layers in terms of its effect on the strength and the Weibull modulus of the SiC.
机译:通过测量涂层模量和破坏应变来表征六面体SiC陶瓷上的多层弹性环境屏障涂层的应力能力。接下来,针对构成涂层的三个独立层中的每一层,确定涂层对基体Hexolly陶瓷破坏行为的影响。已经发现,硅粘结涂层表现出相当大的应力能力,其模量为137GPa,接近理论上完全致密的硅,其破坏应变为1100微应变。粘结涂层似乎占整个涂层的模量的主导。发现该涂层增加了SiC陶瓷的强度和威布尔模量。增强的抗故障能力归因于涂层在改变有效缺陷尺寸和涂层陶瓷中缺陷尺寸分布方面的作用。就其对SiC的强度和威布尔模量的影响而言,Si键合涂层也主导了其他层。

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