Singtering of Nanoscale Tungsten Powder Produced by electrical explosion process

Abstract

Nanoscale tungsten powder was produced by Electrical Explosion Process Oxide passivation layer was removed by a reduction treatment. Prepared nanoscale tungsten powder was sintered by pressureless sintering and spark plasma sintering, respectively. Shrinkage, sintered density and densification rate were measured. Microstructure changes during densification process were observed. For comparison the same sintering experiments were carried out for the microscale tungsten powder. The effeζt of oxygen content on the . sintering behavior was confirmed, showing a different mechanism. From the sintering results for the powder compacts with controlled oxygen content the possible sintering mechanisms were obtained and discussed. The effect of tungsten powder size on the sintering behavior was also given.