期刊
出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.msea.2017.06.100
关键词
Ceramic composites; Boron carbide; Ti3SiC2; Fracture toughness
类别
资金
- National Magnetic Confinement Fusion Science Program of China [2015GB121003]
- National Natural Science Foundation of China [91326102]
- Science and Technology Development Foundation of China Academy of Engineering Physics [2013A0301012]
- Science and Technology Innovation Research Foundation of Institute of Nuclear Physics and Chemistry [2013A0301012]
- China Postdoctoral Research Foundation [2015M580798]
Dense and electrical discharge machinable B4C-TiB2-SiC triple-phase ceramic composites with high fracture toughness and high hardness were successfully fabricated via reactive hot-pressing sintering using B4C and nano layered Ti3SiC2 with different ratios as raw materials at a relatively low temperature of 1850 degrees C. The results showed that the mechanical properties of B4C-TiB2-SiC composite were remarkably enhanced than that of monolithic B4C ceramic. The micro-hardness, flexural strength, fracture toughness and compressive strength of B4C-TiB2-SiC composite prepared with B4C-30 vol% Ti3SiC2 starting powder were 31.6 GPa, 492.3 MPa, 8.0 MPa.m(1/2) and 2727 MPa, respectively. High hardness was attributed to the low open-porosity and grain refinement, while the high toughness was mainly ascribed to the crack deflection due to the dispersed TiB2 and SiC particles in the B4C matrix. Moreover, the composites exhibited significantly improved machinability than monolithic B4C, as evidenced by electrical discharge machining.
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