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Nguyen Van Minh,Yury Konyukhov,Gopalu Karunakaran,Dmitry Ryzhonkov,Tang Duong,Sergey Kotov,Denis Kuznetsov 대한금속·재료학회 2017 METALS AND MATERIALS International Vol.23 No.3
In the present study, the influence of nano additives (Ni, Fe) and different mixing (turbular and magnetic) on thedensification, microstructure and micro-hardness of the tungsten material under spark plasma sintering is analyzed. After turbulent mixing the nanoparticles are distributed widely in the W interparticle gaps but after magneticmixing the nanoparticles are distributed not only on the gaps of the W particles but also on the broken surfaces. Niincorporated tungsten materials achieved the maximum density of 98.3% at 1400 °C (turbular mixing) and 97.9%at 1300 °C (magnetic mixing). Fe incorporated tungsten material showed density of 97.7% at 1600 °C and 97.2%at 1400 °C after turbular and magnetic mixing. The influence of nanoparticles in the densification process wasexplained by Laplace force, boundary slip and Agte-Vacek effect. The microstructural analysis showed that nanomodificationreduced the degree of porosity, and provides a compact material at low temperatures. X-ray fluorescenceanalysis reveals that magnetic mixing shows more uniform distribution of nanoparticles than turbular mixing. Thenanoparticles incorporation increased the micro hardness of tungsten material. Hence, it is clear that magnetic mixingand nano modification greatly improved the densification and sintering behavior of the tungsten material.