碳化硅纳米线增韧碳化硅纤维/碳化硅基体损伤行为研究

doi:10.15541/jim20210045

无机材料学报 ›› 2021, Vol. 36 ›› Issue (10): 1111-1117.DOI: 10.15541/jim20210045

碳化硅纳米线增韧碳化硅纤维/碳化硅基体损伤行为研究

李陇彬¹^,²(), 薛玉冬¹^,², 胡建宝¹^,², 杨金山¹^,², 张翔宇¹^,², 董绍明¹^,²()

1.中国科学院上海硅酸盐研究所, 高性能陶瓷和超精密微结构国家重点实验室, 上海 200050
2.中国科学院大学材料与光电研究中心, 北京 100049

收稿日期:2021-01-27 修回日期:2021-04-15 出版日期:2021-10-20 网络出版日期:2021-05-10
通讯作者: 董绍明, 研究员. E-mail: smdong@mail.sic.ac.cn
作者简介:李陇彬(1997–), 男, 硕士研究生. E-mail: medolia97@student.sic.ac.cn

Influence of SiC Nanowires on the Damage Evolution of SiC_f/SiC Composites

LI Longbin¹^,²(), XUE Yudong¹^,², HU Jianbao¹^,², YANG Jinshan¹^,², ZHANG Xiangyu¹^,², DONG Shaoming¹^,²()

1. State Key Laboratory of High Performance Ceramics and Superﬁne Microstructure, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 200050, China
2. Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing 100049, China

Received:2021-01-27 Revised:2021-04-15 Published:2021-10-20 Online:2021-05-10
Contact: DONG Shaoming, professor. E-mail: smdong@mail.sic.ac.cn
About author:LI Longbin(1997–), male, Master candidate. Email: medolia97@student.sic.ac.cn
Supported by:
National Science and Technology Major Project(2017-IV-0005-0042);Key Research Program of Frontier Science, Chinese Academy of Sciences(QYZDY-SSW-JSC031)

摘要/Abstract

摘要：

通过在碳化硅纤维表面原位生长纳米线得到具有多级增强结构的碳化硅复合材料, 对复合材料引入纳米线后的微观结构、弯曲强度以及损伤的变化过程进行了研究。研究结果表明, 相较于原始的碳化硅纤维增强碳化硅复合材料, 碳化硅纳米线可以明显提高基体沉积效率并改善材料的弯曲力学性能。从声发射技术和维氏硬度压痕测试结果可以看出, 纳米线通过抑制微裂纹的产生和在微裂纹之间发生桥联来抑制早期损伤的发展。此外, 在纳米线表面沉积一层氮化硼界面相, 纳米线与基体之间的结合力变弱, 复合材料对微裂纹的抑制和偏转得到进一步增强, 弯曲性能大幅提升。

关键词: 多级复合材料, 碳化硅纳米线, 力学性能, 声发射

Abstract:

SiC fiber (SiC_f)/SiC composites were modified by SiC nanowires (SiC_nw) grown in-situ on SiC fiber to obtain hierarchical structure. Effects of this hierarchical structure on the properties of composites, such as microstructure, fracture strength and damage evolution, were evaluated. Results show that the introduction of SiC_nw significantly improves the matrix infiltration efficiency. SiC_nwand BN-coated SiC_nwreinforced SiC_f/SiC composites acquire better performance in bending tests by comparison with conventional SiC_f/SiC. SiC_nw coated by BN interphase obviously enhances the strength owing to weak-bonded interface. Besides, results of acoustic emission and Coated Vickers Hardness Impresses reveal that SiC_nw delay early damage evolution at early state and mainly make contribution to hindering and bridging of microcracks, which is further enhanced by BN-coated SiC_nw.

Key words: hierarchical composites, SiC nanowire, mechanical properties, acoustic emission

中图分类号:

TQ174

李陇彬, 薛玉冬, 胡建宝, 杨金山, 张翔宇, 董绍明. 碳化硅纳米线增韧碳化硅纤维/碳化硅基体损伤行为研究[J]. 无机材料学报, 2021, 36(10): 1111-1117.

LI Longbin, XUE Yudong, HU Jianbao, YANG Jinshan, ZHANG Xiangyu, DONG Shaoming. Influence of SiC Nanowires on the Damage Evolution of SiC_f/SiC Composites[J]. Journal of Inorganic Materials, 2021, 36(10): 1111-1117.

图/表 10

Fig. 1 Schematic figure of three-point test within-situ AE monitoring system

Fig. 2 Typical SEM images of (a, b) as-grown SiCnw, (c) BN-coated SiCnw, and typical SEM images demonstrating the pore size of (d) SiCf/SiC and (e) SiCf/SiC-SiCnw composites

Table 1 Density and porosity of different composites

Composite	SiC_f/SiC	SiC_f/SiC- SiC_nw/BN	SiC_f/ SiC-SiC_nw
Bulk density/(g·cm^-3)	(1.98±0.03)	(2.02±0.04)	(2.08±0.03)
Open porosity/%	(17.64±1.08)	(14.39±0.60)	(11.58±1.35)

Table 2 Properties of original composites, as-grown and BN-coated hierarchical composites

Composite	SiC_nwcontent / wt%	Flexural strength, σ_u/MPa	Proportional limit stress, σ_PL/MPa	Strain at flexural strength, ε_u/%	First AE stress, σ_min/MPa	AE onset stress, σ_onset/MPa
SiC_f/SiC	0	(356.7±16.2)	(153.9±6.4)	(0.39±0.05)	(58.8±7.5)	(116.1±8.9)
SiC_f/SiC-SiC_nw	2.0	(412.6±22.4)	(185.1±7.7)	(0.63±0.06)	(66.1±6.2)	(155.8±7.7)
SiC_f/SiC-SiC_nw/BN	2.0	(506.4±28.3)	(247.7±8.6)	(0.88±0.12)	(78.5±5.2)	(171.6±15.9)

Fig. 3 SEM fractural morphologies of (a) as-grown SiCnw, (b, c) BN-coated SiCnw in composites Local parts marked by white rectangular borders demonstrating that SiCnw tends to break (a) or pull out (b, c)

Fig. 4 Fracture morphologies of composite (a) SiCf/SiC, (b) SiCf/SiC-SiCnw and (c) SiCf/SiC-SiCnw/BN The images demonstrating the pull-out length of fibers

Fig. 5 Representative normalized cumulative AE energy curves as a function of stress (a) for composite SiCf/SiC (orange), SiCf/SiC-SiCnw (black) and SiCf/SiC-SiCnw/BN (blue) To clarify the difference of damage threshold among these three groups, initial key part (grey area) in (a) is magnified in (b). Colorful figures are available on website

Fig. 6 Typical stress-strain curves of SiCf/SiC(orange), SiCf/SiC-SiCnw (black) and SiCf/SiC-SiCnw/BN (blue) The proportional limit is pointed out in the picture. Colorful figures are available on website

Fig. 7 Scatter diagrams of the energy of individual AE events as a function of time in composites (a) SiCf/SiC, (b) SiCf/SiC-SiCnw, and (c) SiCf/SiC-SiCnw/BN Considering the massive amount of data, diagrams are depicted after compression

Fig. 8 SEM micrographs of crack propagation around the indentation in composites (a) SiCf/SiC; (b) SiCf/SiC-SiCnw; (c) SiCf/SiC-SiCnw/BN

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碳化硅纳米线增韧碳化硅纤维/碳化硅基体损伤行为研究

Influence of SiC Nanowires on the Damage Evolution of SiC_f/SiC Composites

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碳化硅纳米线增韧碳化硅纤维/碳化硅基体损伤行为研究

Influence of SiC Nanowires on the Damage Evolution of SiCf/SiC Composites

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Influence of SiC Nanowires on the Damage Evolution of SiC_f/SiC Composites