Preparation of alumina–tungsten carbide nanocomposite by mechano-chemical reduction of WO3 with aluminum and graphite

摘要: Abstract Alumina–tungsten carbide composite powders were successfully obtained through reactive milling of WO3, Al and graphite as precursor at room temperature. The structural morphological evolutions the studied by X-ray diffraction (XRD) scanning electron microscopy. Physical properties such density, surface area micro-hardness ball milled also measured. Results showed that mechano-chemical reactions began in first 5 h completed end (80 h). Very fine particles with a homogeneous microstructure hardness 1450 kg/mm2 milling. An annealing step did not lead to extensive grain growth, as-annealed sample still maintained its nanocrystalline characteristics minimum lattice strain.