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Two-dimensional plain-weave silicon carbide fiber fabric reinforced silicon carbide (2D-SiC/SiC) composites were molded by
stacking method and densified through precursor infiltration and pyrolysis (PIP) process. SiC coating was deposited as the
fiber/matrix interphase layer by chemical vapor deposition (CVD) technique. Fiber/matrix debonding and relatively long fiber
pullouts were observed on the fracture surfaces. Additionally, the flexural strength and elastic modulus of the composites
with and without fiber/matrix interphase layer were investigated using three-point bending test and single-edge notched beam
test. The results show that the fiber fraction and the porosity of 2D-SiC/SiC composites with and without coating are 27.2%
(volume fraction) and 11.1%, and 40.7% (volume fraction) and 7.5%, respectively. And the flexural strength and elastic modulus
of 2D-SiC/SiC composites with and without coating are 363.3 MPa and 127.8 GPa, and 180.2 MPa and 97.2 GPa, respectively. With
a proper thickness, the coating can effectively adjust the fiber/matrix interface, thus causing a dramatic increase in the
mechanical properties of the composites.
Foundation item: Project(NCET-07-0228) support by the New Century Excellent Talents in University 相似文献
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短碳纤维增强碳化硅基复合材料的制备 总被引:5,自引:0,他引:5
短纤维的分散均匀性一直是短纤维复合材料应用受限的主要原因.采用固相球磨分散和熔融渗硅工艺,可得到均匀分散的短碳纤维增强碳化硅基复合材料.并利用金相显微镜见察复合材料微观形貌,测试复合材料的抗弯强度和断后韧性. 相似文献
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CVD SiC涂层SiC纤维增强SiC复合材料的研究 总被引:2,自引:0,他引:2
本文采用CVD技术对KD-1 SiC纤维作涂层处理,再通过聚碳硅烷浸渍裂解法制备单向SiCf/SiC复合材料.研究了不同沉积时间的CVDSiC涂层对SiCf/SiC复合材料性能的影响,同时运用SEM研究了SiC纤维表面SiC涂层的形貌.结果表明:经过5小时CVDSiC涂层SiCf/SiC复合材料具有良好的力学性能和抗氧化性能. 相似文献
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城市路网的最短路径并行求解 总被引:1,自引:1,他引:0
随着当前城市规模的不断扩大,交通网络变得越来越复杂,计算最短路径问题不仅要消耗大量的空间资源,同时也花费了更多的时间资源。为了提高最短路径求解的实时性,基于城市小区将复杂网络进行化简,在各个小区中寻找代表节点,将其他无关的节点看做透明的不参与计算,保持原有网络的特性。然后采用并行搜索算法及分层思想进行路径查询,并且在PC机群的并行环境下对其进行实现。实验结果表明,该方法在运行时间和内存空间分配都具有明显的优势,具有良好的实用性。 相似文献
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广义动态模糊神经网络用于股市预测 总被引:1,自引:0,他引:1
提出一种用广义动态模糊神经网络预测股票价格的方法,网络结构可随模糊规则在学习过程中逐渐增长而自动调节,以达到预测最优化.通过选用实用的技术参数指标作为网络的输入变量对上证指数的收盘价进行预测,取得了较为理想的效果. 相似文献