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Materials Research

Print version ISSN 1516-1439

Abstract

ZAKERI, Mohamad; RAMEZANI, Mohammad  and  NAZARI, Ali. Effect of ball to powder weight ratio on the mechanochemical synthesis of MoSi2-TiC nanocomposite powder. Mat. Res. [online]. 2012, vol.15, n.6, pp. 891-897.  Epub Sep 04, 2012. ISSN 1516-1439.  http://dx.doi.org/10.1590/S1516-14392012005000111.

MoSi2-TiC nanocomposite powders were successfully synthesized with different ball to powder weight ratios (BPR) by ball milling of Mo, Si, Ti and graphite elemental powders. Formation of this composite was studied by X-ray diffraction (XRD). Morphology and microstructure of the milled powders were monitored by scanning and transmission electron microscopy (SEM and TEM), respectively. There was incomplete formation in BPR 5:1 after 30 hours of milling, however, the formation of this composite was completed after 10 hours in BPRs 15:1 and 20:1. Higher BPRs with longer milling time led to partially transformation of β to α MoSi2. Based on Rietveld refinement analysis, and subsequent verification by TEM image, nanostructure powders with the mean grain size less than 25 nm were obtained in all BPRs. Very fine submicron powders in agglomerated ones for BPRs 10:1 and 15:1were obtained at the end of milling.

Keywords : MoSi2-TiC; ball milling; nanostructure.

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