ZrB2-SiC- xwt% carbon nanotubes(x=0, 1.0, 2.5, 4.0) ceramic composites were fabricated by the hot-pressing sintering. The prepared conditions, mechanical properties and microstructure were also investigated. TEM was used to observe the microstructure and SEM was used to analyze the fracture surface and crack propagation. Then, the strengthening and toughening mechanism of carbon nanotubes were discussed. Results show that carbon nanotubes can deposit in the ZrB2 crystal grain and form intragranular structure. When the carbon nanotubes content is 2.5wt%, the flexural strength and toughness reach 542MPa and 6.10MPa·m1/2 respectively, with the relative density of 99.6% and Vickers hardness value of 21.7GPa. The reasons of the mechanical properties improvement are the increased compactness, grain refining and the intragranular structure caused by the introduction of carbon nanotubes.
YANG Fei-Yu
,
ZHANG Xing-Hong
,
HAN Jie-Cai
,
DU Shan-Yi
. Preparation and Properties of ZrB2-SiC Ceramic Composites Reinforced by Carbon Nanotubes[J]. Journal of Inorganic Materials, 2008
, 23(5)
: 950
-954
.
DOI: 10.3724/SP.J.1077.2008.00950
[1] Lijimas. Nature, 1991, 354 (6348): 56--58.
[2] Salvetat J P, Kuik A J. Advanced Materials, 1999, 11 (2): 161--167.
[3] Xie S, Li W, Pan Z, et al. Physics and Chemistry of Solids, 2000, 61 (7): 1153--1158.
[4] 李庚英, 王培铭. 硅酸盐学报, 2005, 33 (1): 105--108.
[5] Falvo M R, Claryg J, Taylor R M, et al. Nature, 1997, 389 (6642): 582--584.
[6] Peigney A, Flahaut E, Laurent Ch, et al. Chemical Physics Letters, 2002, 352 (1): 20--25.
[7] Li J L, Bai G Z, Feng J W, et al. Carbon, 2005, 43 (13): 2649--2653.
[8] 张幸红, 洪长青, 韩杰才, 等(ZHANG Xing-Hong, et al). 无机材料学报(Journal of Inorganic Materials), 2006, 21 (4): 899--905.
[9] Kevin P, Martin C, Valeria N, et al. Composites Science and Technology, 2007, 67 (7): 1640--1649.
[10] 吴世平, 杨飞宇, 张幸红, 等. 材料工程, 2007, 2007 (5): 15--18.
[11] Tian W B, Kan Y M, Zhang P L, et al. Materials Science and Engineering A, doi:10.1016/j.msea.2007. 11.027.
