Off-axis creep behavior of oxide/oxide Nextel^TM720/AS-0

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• 作者：Dennis J. Buchanan ; Reji John ; Larry P. Zawada
• 关键词：A. Ceramic– ; matrix composites ; B. Creep ; B. High-temperature properties ; B. Stress/strain curves ; Creep rate ; C. Deformation
• 刊名：Composites Science and Technology
• 出版年：2008
• 出版时间：May 2008
• 年：2008
• 卷：68
• 期：6
• 页码：1313-1320
• 全文大小：892 K

文摘

Oxide/oxide ceramic–matrix composites (CMC) are being demonstrated in engine components that are axisymmetric in shape, and subject to axisymmetric thermo-mechanical loadings. Traditionally, woven CMC materials used in these components are made from 0°/90° fiber architectures. In many cases, the highest stresses are not always coincident with the orientation of the reinforcing fibers. Tensile and creeps tests at 1100 °C on a ±45° CMC composed of Nextel^TM720 fibers and a alumina–silica matrix (AS-0) have been performed. The ±45° orientation has approximately two-thirds the ultimate tensile strength of the 0°/90° orientation. The creep rupture strength at 100 h for the ±45° orientation is approximately one-third that of the 0°/90° orientation.