Research on Microstructure and Morphology of Non-stoichiometric ratio of TiCx

Abstract

TiC possesses many excellent physical and chemical properties, Nevertheless, the high melting point and difficulty for sintering limit its application. In this experiment, the non-stoichiometric TiC (TiCx) powders are fabricated by means of mechanical alloying (MA) synthesis method, in addition, atoms diffuse use in the region of two phases by High pressure sintering, which can reduce the sintering temperature to optimize properties of bulk materials. In the experiment Ti powder and TiC powder in accordance with Ti, C molar mass ratio 1:0.3, 1:0.4, 1:0.5 (respective code TC3, TC4, TC5) synthetic non-stoichiometric TiCx by Mechanical alloying (MA). The X-ray Diffraction (XRD) and a scanning electron microscope (SEM) are used to analyze the structures and observe the morphologies of the milled powders. The results of the X-Ray Diffraction (XRD) analysis showed that the diffraction peaks of Ti disappeared, but amorphous structure appeared after milling for 3 hours. The Ti peak disappeared completely after milling for 6 hours and the grain size is up to 8nm by milling 21 hours. The SEM fracture morphologies of TiC by MA after different time showed that the particle size reached 50-100 nm. At the same time, The particle size distribution is uniform and the agglomeration phenomenon is weakened