期刊
JOURNAL OF ALLOYS AND COMPOUNDS
卷 570, 期 -, 页码 94-99出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2013.03.084
关键词
Directionally solidified eutectic; Ceramic composites; Boron carbide; Titanium diboride
资金
- projects (Singapore) [TL/9010103762, TL/9010101538-04]
- Project (Ukraine) [2305-F]
- [PCCE 3/2012]
Directionally solidified B4C-TiB2 eutectics doped with different Si contents were prepared by floating zone method. Silicon doping (up to 3 vol.%) promotes a more coherent interface between B4C matrix and TiB2 inclusions, a decrease of the spacing between TiB2 (when solidification rate is constant), and formation of a more uniform morphology with thinner inclusions. These features lead to simultaneous enhancement of Vickers hardness (HV), fracture toughness (K-1c) and bending strength (sigma) when compared with Si-free B4C-TiB2 eutectics. For our materials, the average HV, K-1c and sigma were 45.2 GPa, 7.04 MPa m(1/2), and 460 MPa at room temperature or 487 MPa at 1600 degrees C, respectively. The values of sigma at indicated temperatures are approximately twice higher than for the Si-free B4C-TiB2 eutectic composites. (C) 2013 Elsevier B.V. All rights reserved.
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