Journal
INTERNATIONAL JOURNAL OF REFRACTORY METALS & HARD MATERIALS
Volume 111, Issue -, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.ijrmhm.2022.106064
Keywords
W-Mo-Cu composite; Solution combustion synthesis; Liquid phase sintering; Solid solution powder
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Nano-sized W-Mo solid solution powders with different Mo content were successfully fabricated by solution combustion synthesis, and then used to prepare W-Mo-Cu composites by liquid phase sintering. The addition of Mo can promote the densification of the W/Cu composite powders and improve the microhardness of the W-Cu composites, but the conductivity will inevitably be reduced.
Due to the high melting points of W and Mo, W-Mo solid solution powder needs to be prepared at extremely high temperatures using W and Mo elemental powder. Herein, the nano-sized W-Mo solid solution powders with different Mo content were successfully fabricated by solution combustion synthesis. And then the W-Mo nanopowders were used to prepare W-Mo-Cu composites by liquid phase sintering. The results revealed that the addition of Mo can promote the densification of the W/Cu composite powders and improve the microhardness of the W-Cu composites, while the conductivity will inevitably be reduced. When the amount of Mo addition is <10 wt%, the Mo element is uniformly distributed in the W particles in the W-Mo-Cu composites, while the segregation of Mo was observed when Mo addition >10 wt% due to inhomogeneous Mo distribution in the starting powder. Meanwhile, the Mo segregation region may be responsible for the formation of Mo2C phase in (W-20Cu)-30Cu, due to the susceptibility of Mo to react with carbon. During the arc ablation process, the Mo in the W particles dissolves into the liquid-phase Cu, increasing the viscosity and reducing the splashing of the Cu.
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