首页|Synthesis, Microstructure and Mechanical Properties of ZrB_2 Ceramic Prepared by Mechanical Alloying and Spark Plasma Sintering
Synthesis, Microstructure and Mechanical Properties of ZrB_2 Ceramic Prepared by Mechanical Alloying and Spark Plasma Sintering
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NETL
NSTL
Trans Tech Publications Ltd
Dense bulk ZrB_2 ceramic was synthesized by mechanical alloying (MA) and followed spark plasma sintering (SPS) using zirconium and boron as initial materials. It was found that MA process was effective to fragment the coarse metal zirconium particles from 45 μm to less than 1 μm within 20 hours. In comparison with the commercial ZrB_2 powder, the as-obtained zirconium and boron mixture powders showed higher sinterability. When the sintering was carried out at 1800℃, the relative density of synthesized ZrB_2 samples using mixture powder was above 95%, higher than that of ZrB_2 sample prepared using commercial powder (73%). Vickers hardness of those ZrB_2 samples was at the same level of 15 GPa. However, the fracture toughness of ZrB_2 samples seemed to depend on the heating rate of the SPS process. Corresponding to the heating rates of 10, 50, and 100℃/min, the fracture toughness of as-prepared ZrB_2 samples were 3.83, 3.19, and 2.74 MPa·m~(1/2), respectively.
NETL
NSTL
Trans Tech Publications Ltd
