期刊
CERAMICS INTERNATIONAL
卷 44, 期 1, 页码 51-56出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.ceramint.2017.08.207
关键词
Composite; Combustion synthesis; Hot-pressing; Mechanical properties; Intermetallics; Silicides
资金
- National Natural Science Foundation of China [51574241]
- NSFC-STINT [51611130064]
- Program for Innovation Research Team of China University of Mining and Technology [2015QN004]
- Swedish Foundation for Strategic Research (SSF) [RIF14-0083]
Mo, Si and B4C powders were used to fabricate 0.4MoB-0.1SiC-xMoSi(2) composites by self-propagating high-temperature synthesis (SHS) and hot pressing (HP). The effects of MoSi2 content (x = 1, 0.75, 0.5 and 0.25) on phase composition, microstructure and properties of the composites were investigated. The results showed that the 0.4MoB-0.1SiC-xMoSi(2) composite exhibited Vickers hardness of 10.7-15.2 GPa, bending strength of 337-827 MPa and fracture toughness of 4.9-7.0 MPa m(1/2). The fracture toughness increased with the increasing volume fraction of MoB and SiC particles which were promoted by the toughening mechanisms, such as crack bridging, cracks deflection and crack branching. Moreover, the electrical resistivity showed an increasing trend with decreasing volume fraction of MoSi2.
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