| Effect of processing parameters on the mechano-chemical synthesis of Mo-Cu/Al2O3 nano-composite |
| Paper ID : 1258-UFGNSM-FULL |
| Authors: |
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shiva moradi1, Mohammad Talafi Noghani2, morteza Saghafi Yazdi *2 1Qazvin, noruzian st, hekmate 70, khabgahe zeytoon 2Department of Materials Science and Engineering, Faculty of Engineering, Imam Khomeini International University, Qazvin, Iran |
| Abstract: |
| In this study, molybdenum-copper/alumina nano-composite was synthesized with mechano-chemical method using high energy planetary ball milling. The molybdenum oxide, copper oxide and aluminum powder were used as starting materials and reaction appeared to occur through a rapid combustion reaction process. The evaluation of powder particles after different milling times was studied by X-ray diffraction (XRD), differential thermal analysis/thermogravimetric (DTA/TG) and scanning electron microscopy (SEM). XRD results show that with increasing milling time at ambient temperature the peak intensities of powders decreases and significant peak broadening due to decrease in size of crystallites observed. As a result, after 10 h milling time a molybdenum-copper/alumina metal matrix nanocomposite was formed which matrix had a crystallite size of about 34 nm calculated from Scherrer formula. In fact by increasing the milling time after reduction of metal oxides, molybdenum dissolves in copper matrix and supersaturated Cu(Mo) solid solution with a homogenous distribution of nano-sized Al2O3 as reinforcement materials was formed. The thermal analysis curves of 10 minutes milled sample shows some peaks related to reduction of copper and molybdenum oxide with aluminum. In addition the small endothermic peak at 500 °C observed from DTA curve is due to the melting of remaining Al. |
| Keywords: |
| Ball milling; Mo-Cu/Al2O3 nano-composite; X-ray diffraction |
| Status : Paper Accepted (Poster Presentation) |
