Characterization of Diamonds Synthesized Via Powder Metallurgy Route
In this study, synthetic diamonds were prepared from supersaturated solid solution (SSSS) of nickel-graphite (Cgr) formed by mechanical alloying (MA) of Ni-15 wt.%Cgr. The SSSS prepared was consolidated by hot pressing (HP)/ spark plasma sintering (SPS). The Raman spectrographs show peaks at 1333 cm-1 and 1341 cm-1, confirming the formation of the diamond. The diamonds were then extracted from the compacted samples and characterized by scanning electron microscopy (SEM), particle size analyser, TEM and fourier transform infrared (FTIR) spectroscopy. The synthesised diamonds were found to be aggregates of 1-2 µm size having crystallites of sub-micron/ nano range size in the case of HP/SPS, respectively. The FTIR spectrum shows the formation of type IaA and Ib diamonds by HP/SPs, respectively.
Keywords - Mechanical Alloying; Supersaturated Solid Solution; Hot Pressing; Spark Plasma Sintering; Raman Spectroscopy; Fourier Transform Infrared Spectroscopy