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Srinivasan, Malur
- Evaluation of Iron Aluminide-Fly Ash Nanocomposite Prepared by Attritor Milling and Equal Channel Angular Extrusion Consolidation
Authors
1 Department of Mechanical Engineering Lamar University Beaumont, Texas 77710, US
2 Engineering Project Manager, SBM, Offshore, US
Source
Power Research, Vol 9, No 4 (2013), Pagination: 595-602Abstract
An experimental investigation was conducted to evaluate the crystallite size and microhardness of mixtures iron aluminide (Fe3Al) powder and Class C fly ash in different volume percentages, subjected to attritor milling and consolidation using Equal Channel Angular Extrusion (ECAE) process. Design if experiments was employed to select the lowest size of fly ash to be mixed with pre-milled iron aluminide powder. The results indicate that crystallite sizes n the low nano-range are obtained in all iron aluminide-fly ash compacts, qualifying the compact as a nanocomposite. The microhardness of the nanocomposite is lower than that of the nano-iron aluminide indicating the possibility of porosity being developed in fly ash during processing.Keywords
Iron Aluminide, Fly Ash, Nanocomposite, Attritor Milling, Pure Shear Consolidation, Microhardness
- Cement-Carbon Nanotube Composites and Their Multifunctional Behavior: A Brief Overview
Authors
1 Department of Mechanical Engineering Lamar University Beaumont, Texas 77710, US
Source
Power Research, Vol 9, No 4 (2013), Pagination: 603-612Abstract
The author has tried to provide a brief overview of the constituents of cement-carbon nanotube composites, their interactions and some examples of research on functional behavior of the composites. Many interactions are at the nanoscale and the functional behavior is strongly affected by such factors as the type and features of carbon nanotube, the proportion carbon nanotube in cement, the method adopted for dispersion of carbon nanotube in cement-water mixture, admixtures and others. Though MWCNT' (Multiwalled carbon nanotube) is by far the more widely used, little information is available other than the diameter and length of the MWCNT, pointing out towards the need for optimization of the MWCNT features. There is thus a huge potential for optimization of structure-property relationships in the constituents of the cement-carbon nanotube composites and interested researchers are encouraged to study the full publications cited in this paper and the references cited in each publication.
The structure and properties of carbon nanotubes are first reviewed, to indicate why this material is so unique. Next, nanoscale structure development in cement is reviewed, with the hope that further research on nanoscale interactions between carbon nanotube and cement will lead to more improvements in the functional behavior of the composite. Finally, papers dealing with chosen functional properties relevant to cement-carbon nanotube composites composite, are reviewed.