Process and Mechanical Properties of in Situ Silicon Carbide‐Nanowire‐Reinforced Chemical Vapor Infiltrated Silicon Carbide/Silicon Carbide Composite
Process and Mechanical Properties of in Situ Silicon Carbide‐Nanowire‐Reinforced Chemical Vapor Infiltrated Silicon Carbide/Silicon Carbide Composite
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DOI：
10.1111/j.1551-2916.2004.01720.x
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发表时间：
2004-09
影响因子：
3.9
通讯作者：
Wen Yang;H. Araki;A. Kohyama;Somsri Thaveethavorn;Hiroshi Suzuki;T. Noda
中科院分区：
文献类型：
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作者：
Wen Yang;H. Araki;A. Kohyama;Somsri Thaveethavorn;Hiroshi Suzuki;T. Noda
采用化学气相渗透法（CVI）致密化基体前，直接在纤维预制体中原位生长SiC纳米线，制备了SiC纳米线/Tyranno-SA纤维增强SiC/SiC复合材料。纳米线由单晶β相SiC和均匀的约15 nm碳壳组成，直径为几十到一百纳米。制备的复合材料中纳米线的体积分数为0.5%。然而，复合材料没有显示出强度和韧性的显著增加，这可能是因为纳米线上非常薄的碳涂层引起的纳米线和基质之间的强结合。在复合材料的断裂面处观察到SiC纳米线从基体中的剥离和拔出。
A SiC nanowire/Tyranno-SA fiber-reinforced SiC/SiC composite was fabricated via simple in situ growth of SiC nanowires directly in the fibrous preform before CVI matrix densification; the purpose of the SiC nanowires was to markedly improve strength and toughness. The nanowires consisted of single-crystal β-phase SiC with a uniform ∼5 nm carbon shell; the nanowires had diameters of several tens to one hundred nanometers. The volume fraction of the nanowires in the fabricated composite was ∼5%. However, the composite did not show significant increase in strength and toughness, likely because of strong bonding between the nanowires and the matrix caused by the very thin carbon coating on the nanowires. Little debonding and pullout of SiC nanowires from the matrix were observed at the fracture surfaces of the composite.