Sintering and Characterizations of WC-20wt.% (Fe,Co) Nano-Structured Powders Developed by Ball-Milling

Journal of Advanced Materials and Processing

مقاله 2، دوره 2، شماره 3، آبان 2014، صفحه 3-14   

نوع مقاله: Research Paper

نویسندگان

Minoo Karbasi^{* 1}؛ Maryam Karbasi²؛ Ali Saidi³؛ Mohammad Hossein fathi³

¹Department of Materials Engineering, Isfahan University of Technology, Isfahan, 8415683111 IRAN

²Instructor Department of Materials Engineering, Isfahan University of Technology, Isfahan, 8415683111 IRAN

³Professor Department of Materials Engineering, Isfahan University of Technology, Isfahan, 8415683111 IRAN

چکیده

The aim of the present work is to study the effects of the nanostructured WC-20 wt. % (Fe,Co) with different ratios of iron to cobalt on the microstructure and hardness of sintered samples. Furthermore, a sample with a cobalt binder under the same condition was produced for the comparison purposes. The nanocomposite development, after different milling times, has been monitored by means of X-ray diffraction (XRD), scanning electron microscopy (SEM), and transmission electron microscopy (TEM). A homogenous distribution of nanostructured WC (crystallite size less than 30 nm) in the binder matrix was formed after 25 h milling. The hardness and the relative density of the WC-20wt. % (Fe,Co) composites consolidated by conventional sintering at 1350˚C were investigated. In sintered samples after 25 h milling, tungsten carbide grains have a uniform distribution with a lower grain size. Densification and hardness improved after 25 h milling and reached optimum levels for the 25 h milled powders with equal ratio of iron to cobalt.

کلیدواژه‌ها

WC-based cemented carbides؛ Ball milling؛ Microstructure؛ Hardness؛ Sintering