材料科学
复合材料
极限抗拉强度
涂层
纤维
陶瓷基复合材料
相间
陶瓷
模数
开裂
遗传学
生物
作者
H. M. Yun,John P. Gyekenyesi,Y.L. Chen,Donald R. Wheeler,James A. DiCarlo
出处
期刊:John Wiley & Sons, Inc. eBooks
[Wiley]
日期:2008-03-26
卷期号:: 521-531
被引量:25
标识
DOI:10.1002/9780470294680.ch60
摘要
Near stoichiometric SiC fibers, such as Sylramic and Hi-Nicalon Type S, display very good thermomechanical properties that are essential for high-temperature structural ceramic matrix composites (CMC). Recently NASA has developed a treatment for the Sylramic fiber that further improves its creep-rupture properties and environmental interactions by removing boron from the bulk and forming a thin in-situ BN coating on the fiber surface. To understand its benefits for fiber-controlled CMC properties, this treatment was performed on two-dimensional 0\90 degree woven Sylramic fabric prior to forming SiC\SiC composites with a BN interphase and a melt-infiltration SiC matrix. Tensile stress-strain behavior for the CMC showed a high modulus followed by graceful cracking at a high proportional limit, but more importantly a higher ultimate strength than for the SiC\SiC composites fabricated in the same manner, but reinforced by untreated Sylramic and Hi-Nicalon Type S fibers. It is believed that this improved ultimate strength behavior is primarily related to the in-situ BN coating that acts to protect the fibers from environmental effects introduced during the CMC fabrication process.
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