Microstructure transformation and mechanical properties of TiC-TiB2 ceramics prepared by combustion synthesis in high gravity field

被引:46
作者
Huang, Xuegang [1 ]
Zhang, Long [1 ]
Zhao, Zhongmin [1 ]
Yin, Chun [2 ]
机构
[1] Mech Engn Coll, Shijiazhuang 050003, Hebei, Peoples R China
[2] Univ Elect Sci & Technol China, Sch Math Sci, Chengdu 611731, Sichuan, Peoples R China
来源
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING | 2012年 / 553卷
关键词
TiC-TiB2; composites; Microstructure; Fracture behavior; Toughening; TERNARY-SYSTEM; BORON-CARBON; COMPOSITES;
D O I
10.1016/j.msea.2012.05.099
中图分类号
TB3 [工程材料学];
学科分类号
0805 ; 080502 ;
摘要
By conducting combustion synthesis in high-gravity field, the solidified TiC-TiB2 with a series of TiB2 mole content were prepared through adjusting the mole ratio of C and B elements in combustion system. XRD, FESEM and EDS results showed that with increasing TiB2 mole content, the matrix of TiC-TiB2 composite ceramics transformed a number of fine TiB2 platelets from the TiC spherical grains, and fine-grained even ultrafine-grained microstructures were achieved in solidified TiC-50%TiB2 due to the coupled quasi-eutectic growth under rapid solidification of the ceramic. Properties showed that relative density, Vickers hardness and flexural strength of TiC-50%TiB2 simultaneously reached the maximum values of 98.7%, 21.5 +/- 1.5 GPa and 860 +/- 35 MPa, whereas the maximum fracture toughness of 13.5 +/- 1.5 MPa m(0.5) was achieved in TiC-66.7%TiB2. FESEM fractography analyses of the solidified ceramics indicated that the highest flexural strength achieved in TiC-50%TiB2 benefits from not only the lowest content of Al2O3 inclusions and Cr-W-Ti borides, but also the achievements of fine-grained microstructure in the near-full-density ceramic and high fracture toughness contributed from a intensive coupled mechanism of crack deflection, crack-bridging and pull-out by a large number of fine TiB2 platelets. (C) 2012 Elsevier B.V. All rights reserved.
引用
收藏
页码:105 / 111
页数:7
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