Low temperature synthesis of dense TiB2 compacts by reaction spark plasma sintering
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Abstract
Abstract In this study, the low temperature synthesis of dense titanium diboride (TiB 2 ) compacts by reaction spark plasma sintering (RSPS) of ball milled mixtures of titanium and boron powders is presented. The influence of milling time and sintering temperature on the in-situ reactive synthesis, densification, grain size and mechanical properties of TiB 2 was investigated. TiB 2 compacts with relative density above 99% have been obtained at a significantly low sintering temperature of 800 °C. X-ray diffraction analysis confirmed the formation of TiB 2 along with a small amount of secondary TiB phase. The effect of TiB on the grain size and the hardness and fracture toughness was investigated. TiB 2 compacts processed were found to have a nanohardness > 26 GPa and an elastic modulus > 570 GPa and indentation fracture toughness more than 3.30 MP a.m 1/2 . It is shown that RSPS can be an attractive route for synthesis of ultrahigh temperature ceramics at low temperatures.
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