ZrB2-CNTs Nanocomposites Fabricated by Spark Plasma Sintering

被引：12
作者：
Jin, Hua [1 ]
Meng, Songhe [1 ]
Xie, Weihua [1 ]
Xu, Chenghai [1 ]
Niu, Jiahong [1 ]
机构：
[1] Harbin Inst Technol, Natl Key Lab Sci & Technol Adv Composites Special, Harbin 150001, Peoples R China
来源：
MATERIALS | 2016年 / 9卷 / 12期
基金：
中国国家自然科学基金;
关键词：
nanocomposites; carbon nanotubes (CNTs); ZrB2; fracture toughness; strength; HIGH-TEMPERATURE CERAMICS; MECHANICAL-PROPERTIES; ZRB2-SIC CERAMICS; CARBON NANOTUBES; PARTICLE-SIZE; ZIRCONIUM DIBORIDE; SIC PARTICLES; HEATING RATE; MICROSTRUCTURE; COMPOSITES;
D O I：
10.3390/ma9120967
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：
ZrB2-based nanocomposites with and without carbon nanotubes (CNTs) as reinforcement were prepared at 1600 degrees C by spark plasma sintering. The effects of CNTs on the microstructure and mechanical properties of nano-ZrB2 matrix composites were studied. The results indicated that adding CNTs can inhibit the abnormal grain growth of ZrB2 grains and improve the fracture toughness of the composites. The toughness mechanisms were crack deflection, crack bridging, debonding, and pull-out of CNTs. The experimental results of the nanograined ZrB2-CNTs composites were compared with those of the micro-grained ZrB2-CNTs composites. Due to the small size and surface effects, the nanograined ZrB2-CNTs composites exhibited stronger mechanical properties: the hardness, flexural strength and fracture toughness were 18.7 +/- 0.2 GPa, 1016 +/- 75 MPa, and 8.5 +/- 0.4 MPa.m(1/2), respectively.
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页数：9
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