Authors: M. Sherif El-Eskandarany, A. Al-Hazza, A. Alduweesh
Affilation: Kuwait Institute for Scientific Research, United States
Pages: 408 - 411
Keywords: WC-Co nanocomposites, powder metallurgy, powder concolidation, nanoindentation
WC-Co-based composites possess unique and useful properties that make them desirable materials for wide range of industrial applications such as tips for cutting and drilling tools, wear resistant parts in wire drawing, extrusion and pressing dies and wear-resistant surfaces in many types of machines. The present study has been undergone in order to fabricate new nanocomposite of WC-5Co-1Cr-3MgO-0.7VC/0.3Cr3C2 (wt.%) powders by mechanically-induced solid state mixing, using high energy ball milling technique. It aims to improve the homogeneity of the synthesized materials and the corresponding mechanical properties at the micro-and nano-scale. To attain these goals, the as-fabricated powders were consequently consolidated into dense bulk materials at a temperature of 1500 oC with a pressure of 30 MPa, using spark plasma sintering (SPS) technique. The structure of the as-synthesized powders and the consolidated bulk samples were investigated by X-ray and high resolution field-emission transmission electron microscope/energy dispersive X-Ray spectrometer. Field emission scanning electron microscope (FESEM) and electron probe micro analyzer electron microscope/EDS (EPMA/EDS) were utilized to analyze the local elemental compositions of the nanocomposite powders. Whereas the microhardness of the consolidated samples was investigated by Vickers hardness tester, their nanohardness and Young's modulus properties were determined via nanoindentation approach.