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

Materials

Zongxu Wu¹  Zhaoke Chen¹  Qingbo Wen¹  Haoran Wang¹  Ruiqian Zhang²  Ming Li²  Zongbei He²  Xiang Xiong³ 

[1] Science and Technology on High Strength Structural Materials Laboratory, Central South University, Changsha 410083, China;Science and Technology on Reactor Fuel and Materials Laboratory, Nuclear Power Institute of China, Chengdu 610213, China;State Key Laboratory of Powder Metallurgy, Central South University, Changsha 410083, China;

关键词: SiC nanowires;    atomic deposition method;    SiC_f/SiC composites;    compression performance;   

DOI  :  10.3390/ma15082900

来源: DOAJ

【 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 SiC_f/SiC composites. Two different catalyst-introduction methods (electroplating (EP) vs. atomic deposition (AD)) have been used to catalyze the growth of SiC nanowires in SiC_f 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 SiC_f/SiC composited was densified by CVI. The compressive strength of the SiCNWs-reinforced SiC_f/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 SiC_f preform. The yield of SiCNWs is effectively increased in the internal pores of the SiC_f preform, and a denser network forms. Therefore, the mechanical properties of SiCNW-containing SiC_f/SiC composites are significantly improved. Compared with the EP-composites and SiC_f/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 SiC_f/SiC composites.

【 授权许可】

Unknown