Fabrication and properties of CNT/Ni/Y/ZrB2 nanocomposites reinforced in situ

被引：4
|
作者：
Jin, Hua [1 ]
Li, Zhewen [1 ]
Wang, Liuwei [1 ]
Zeng, QinXuan [1 ]
机构：
[1] Harbin Inst Technol, Natl Key Lab Sci & Technol Adv Composites Special, Harbin, Heilongjiang, Peoples R China
来源：
JOURNAL OF THE AMERICAN CERAMIC SOCIETY | 2018年 / 101卷 / 04期
基金：
中国国家自然科学基金;
关键词：
ceramic matrix composites; MECHANICAL-PROPERTIES; CARBON NANOTUBES; OXIDATION BEHAVIOR; PARTICLE-SIZE; MICROSTRUCTURE; CERAMICS; CNTS; DENSIFICATION; TEMPERATURE; COMPOSITES;
D O I：
10.1111/jace.15318
中图分类号：
TQ174 [陶瓷工业]; TB3 [工程材料学];
学科分类号：
0805 ; 080502 ;
摘要：
Carbon nanotubes (CNTs) were synthesized in situ by chemical vapor deposition of methane over nano-ZrB2 matrix using Ni/Y catalysts. Well-grown CNTs with tangled and long bodies and mainly composed of well-crystallized graphite were obtained when the Ni content reaches 10 wt%. The CNT/ZrB2 nanocomposites obtained by spark plasma sintering at 1400 degrees C exhibited full density and optimal mechanical properties. The flexural strength and fracture toughness of the nanocomposites were 1184 +/- 52 MPa and 10.8 +/- 0.3 MPa.m(1/2), respectively. Results indicated that the dispersion of CNTs in situ can improve composite performance, rendering the mechanical properties of the CNT/ZrB2 nanocomposites synthesized in situ considerably superior to those of monolithic ZrB2 nanoceramics and CNT/ZrB2 nanocomposites synthesized using the traditional method. The toughening mechanisms included crack deflection, crack bridging, CNT debonding, pull-out, and fracture.
引用
收藏
页码：1747 / 1753
页数：7
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