Microstructure and flexural properties of multilayered fiber-reinforced oxide composites fabricated by a novel lamination route
Microstructure and flexural properties of multilayered fiber-reinforced oxide composites fabricated by a novel lamination route
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DOI：
10.1016/j.ceramint.2015.02.120
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发表时间：
2015-07-01
影响因子：
5.2
通讯作者：
Janssen, Rolf
中科院分区：
文献类型：
--
作者：
Guglielmi, Paula O.;Blaese, Diego;Janssen, Rolf
研究了热塑性预浸料层合制备全氧化物陶瓷基复合材料的新工艺。这条路线允许生产具有非常均匀的微观结构和减少数量的基体裂纹的复合材料。Nextel(TM) 610氧化铝机织织物用于增强由80 vol% Al2O3和20 vol% ZrO2组成的多孔氧化物基体。研究了不同热处理条件下复合材料在四点弯曲和短梁剪切作用下的力学行为。结果表明：低层间剪切强度的复合材料在4点弯曲作用下表现为优美破坏，其特征是在应变超过峰值应力后，应力逐步减小；复合材料在断裂过程中伴随着一系列界面剥离事件，增强了破坏过程中的能量耗散。由于基体致密化导致的层间剪切强度的增加导致阶梯应力-应变行为的丧失。然而，纤维相关的增韧机制，如裂纹挠曲和桥接，仍然会导致这些复合材料的非弹性变形直至失效。0 (C) 2015 Elsevier Ltd and Techna Group S.r.l版权所有
All-oxide ceramic matrix composites produced by a novel route based on the lamination of thermoplastic prepregs are investigated. This route allows for the production of composites with very homogeneous microstructures and a reduced amount of matrix cracks. Nextel(TM) 610 alumina woven fabric is used here to reinforce a porous oxide matrix composed of 80 vol% Al2O3 and 20 vol% ZrO2. The mechanical behavior of composites submitted to different heat treatments is investigated under 4-point bending and short beam shear. Results show that composites with low interlaminar shear strength present a graceful failure under 4-point bending, characterized by a stepwise stress reduction upon straining beyond the peak stress. The fracture of such composites is accompanied by a series of interfacial delamination events, which enhance energy dissipation during failure. An increase of the interlaminar shear strength due to matrix densification causes a loss of the stepped stress-strain behavior. Nevertheless, fiber-related toughening mechanisms such as crack deflection and bridging still ensure inelastic deformation up to failure of these composites. 0 (C) 2015 Elsevier Ltd and Techna Group S.r.l. All rights reserved.