Significant Improvement of Mechanical Properties of SiC-Nanowire-Reinforced SiCf/SiC Composites via Atomic Deposition of Ni Catalysts

被引:2
|
作者
Wu, Zongxu [1 ,2 ]
Wang, Haoran [1 ,2 ]
Chen, Zhaoke [1 ,2 ]
Zhang, Ruiqian [3 ]
Wen, Qingbo [1 ,2 ]
He, Zongbei [3 ]
Li, Ming [3 ]
Xiong, Xiang [2 ]
机构
[1] Cent South Univ, Sci & Technol High Strength Struct Mat Lab, Changsha 410083, Peoples R China
[2] Cent South Univ, State Key Lab Powder Met, Changsha 410083, Peoples R China
[3] Nucl Power Inst China, Sci & Technol Reactor Fuel & Mat Lab, Chengdu 610213, Peoples R China
关键词
SiC nanowires; atomic deposition method; SiCf; SiC composites; compression performance; CLADDING TUBE; GROWTH; FABRICATION; STRENGTH;
D O I
10.3390/ma15082900
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
This study aimed to study the effects of different catalyst introduction methods on the distribution of SiC nanowires (SiCNWs) and the mechanical properties of SiCf/SiC composites. Two different catalyst-introduction methods (electroplating (EP) vs. atomic deposition (AD)) have been used to catalyze the growth of SiC nanowires in SiCf preforms. The morphology, structure and phase composition were systematically investigated using scanning electron microscopy (SEM), transmission electron microscopy (TEM) and X-ray diffraction (XRD). The SiCNWs-reinforced SiCf/SiC composited was densified by CVI. The compressive strength of the SiCNWs-reinforced SiCf/SiC composites was evaluated by radial crushing test. Compared with EP, atomic Ni catalysts fabricated by AD have higher diffusivity for better diffusion into the SiCf preform. The yield of SiCNWs is effectively increased in the internal pores of the SiCf preform, and a denser network forms. Therefore, the mechanical properties of SiCNW-containing SiCf/SiC composites are significantly improved. Compared with the EP-composites and SiCf/SiC composites, the compressive strength of AD-composites is increased by 51.1% and 56.0%, respectively. The results demonstrate that the use of AD method to grow SiCNWs is promising for enhancing the mechanical properties of SiCf/SiC composites.
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页数:15
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