Mechanical alloying, sintering and characterization of Al2O3-5 wt% Cu nanocomposite

2^nd International Conference and Expo on Ceramics & Composite Materials

July 25-26, 2016 Berlin, Germany

Mohammed A Taha

National Research Centre, Egypt

Posters & Accepted Abstracts: J Material Sci Eng

Abstract :

Al2O3 5 wt.%-Cu nanocomposite powder was synthesized by mechanical alloying method using a planetary ball mill up to 20 h. The properties of the milled powders were studied by X-ray diffraction (XRD) technique and transmission electron microscopy (TEM). Then, the milled powders were cold pressed and sintered at different temperatures for 1 h in argon atmosphere. The relative density and the apparent porosity of the sintered samples were measured. Scanning electron microscopy (SEM) coupled with energy dispersive spectroscopy (EDS) was employed to investigate the microstructure of the sintered samples. Microhardness and fracture toughness of the sintered composites were also measured. The effect of milling time on the properties of the prepared powders and sintered samples were studied. The results revealed that the Cu particles were uniformly distributed in the Al2O3 matrix and covered the Al2O3 matrix after 10 h of milling. The crystal and the particle sizes were decreased with increased milling time while lattice strain increased. The relative density of the sintered samples exhibited a remarkable increase with the increase of milling time and sintering temperatures. Results also pointed out that the microhardness increased while the fracture toughness slightly decreased with the increasing of milling time.

Biography :

Email: mtahanrc@gmail.com