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Homogeneous Dispersion of TiC Nano Particles in a Cast Carbon Steel Matrix

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Abstract:

Metal matrix nano-composites (MMNCs) (metal matrix with nano-sized ceramic particles) can be of great significance because of their high performance and thus it would be advantageous to produce as-cast bulk MMNCs. However, it is so difficult to disperse nano-sized ceramic particles uniformly in molten metal. In this study, carbon steel matrix composites with a homogeneous dispersion of TiC nano particles were fabricated by conventional liquid metal casting method. In order to get highly wettable nano-sized TiC ceramic particles, the micro-sized (∼10 μm) TiC particles were first mechanically milled (MMed) by Cu in a high-energy ball mill machine (MMed TiC/Cu), and then mixed with Sn powders to obtain better wettability, as this lowered the surface tension of the carbon steel melt. According to OM images, an addition of MMed TiC/Cu-Sn mixed powders favorably disperses the TiC nano particles in the carbon steel matrix. SEM and EDS images revealed that spherical particles with several hundreds of nanometers were distributed uniformly in the carbon steel matrix. It was also found that the grain size refinement of the cast matrix is achieved remarkably when TiC nano particles were added due to the fact that TiC nano particles act as nucleation sites during the solidification process.

Keywords: CARBON STEEL; CASTING; DISPERSION; MECHANICAL MILLING; TIC NANO PARTICLES; WETTABILITY

Document Type: Research Article

DOI: http://dx.doi.org/10.1166/jnn.2010.1529

Publication date: January 1, 2010

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  • Journal for Nanoscience and Nanotechnology (JNN) is an international and multidisciplinary peer-reviewed journal with a wide-ranging coverage, consolidating research activities in all areas of nanoscience and nanotechnology into a single and unique reference source. JNN is the first cross-disciplinary journal to publish original full research articles, rapid communications of important new scientific and technological findings, timely state-of-the-art reviews with author's photo and short biography, and current research news encompassing the fundamental and applied research in all disciplines of science, engineering and medicine.
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