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Fabrication of binder-free ultrafine WC-6Co composites by coupled multi-physical fields activation technology

Huang, Kunlan and Qin, Yi and Yin, Deqiang and Yang, Yi and Yang, Gang (2013) Fabrication of binder-free ultrafine WC-6Co composites by coupled multi-physical fields activation technology. In: Advances in Manufacturing Technology XXVII. Cranfield University Press, Cranfield, pp. 369-374. ISBN 9781907413230

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A novel sintering method, named as coupled multi-physical fields activation technology, has been introduced for the forming of various material powder systems. Compared with the conventional ones, this technique presents more advantages: lower sintering temperature, shorter forming time, and remarkable inhibition of the grains coarsening. In the study, the cylinders of Φ4.0mm×4.0mm had been formed with ultrafine WC-6Co powders. The relative properties of sintered WC-6Co cemented carbides, such as hardness and the microstructures, had been obtained. The study has shown that a relative density, 97.80%, of the formed samples, could been achieved when the case of temperature 850℃, heating rate 50℃/s, pressure 75MPa and Electro-heating loop 6 times, were used. More importantly, the circumscription for the growth of grain size of WC, attributed to the effect of electrical field, renders coupled multi-physical fields activation technology applicable for getting WC- 6Co cemented carbides with fine grain size and good properties.