首页|Ultra-high-hard Composites of TiC-TiB_2 Prepared by Combustion Synthesis under High Gravity
Ultra-high-hard Composites of TiC-TiB_2 Prepared by Combustion Synthesis under High Gravity
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NETL
NSTL
Trans Tech Publications Ltd
The large-bulk solidified TiC-TiB_2 composites were prepared by combustion synthesis in high-gravity field. XRD, FESEM, SEM and EDS results showed that TiC-TiB_2 composites were mainly composed of TiC matrix in which a number of fine TiB_2 platelets were embedded, surrounded by the boundary regions consisting of (Cr, Ti) C_(0.63) carbides. The hardness, flexural strength and fracture toughness of TiC-TiB_2 composites measured 28.5GPa, 750±25MPa and 6.2±0.5MPa·m~(1/2). High hardness of the composites benefits from the absence of the intermediate borides and the achievement of stoichiometric TiC phases due to rapid solidification, whereas the achievement of high strength benefits the refinement and homogeneity of the microstructures due to rapid separation of liquid oxides in high-gravity field and rapid coupled growth of TiC and TiB_2 phases.
NETL
NSTL
Trans Tech Publications Ltd
