In the present research, spherical WMo alloy powder for additive manufacturing was successfully synthesized by spray granulation (SG) in combination with thermal plasma spheroidization (TPS). Firstly, W and Mo particles (1–3 μm) were banded together through SG and formed porous agglomerated powder with desired particle size distribution and flowability. The porous agglomerated WMo powder was subsequently melted through thermal plasma, W and Mo dissolved together and formed solid solution accompanied with powder densification during TPS. Through optimization of the process conditions, the spheroidized WMo alloy powder exhibits homogeneous element distribution, low oxygen content (~0.08%), and good flowability (10 s/50 g), which meet the demand for laser powder bed fusion (LPBF). Remarkably, nearly full dense WMo alloy with few pores could be fabricated by LPBF based on the spheroidized WMo alloy powder.

在本研究中，通过喷雾造粒（SG）结合热等离子体球化（TPS）成功合成了用于增材制造的球形W Mo合金粉末。首先，通过SG将W和Mo颗粒（1-3μm）绑在一起，形成具有所需粒度分布和流动性的多孔团聚粉末。随后将多孔附聚的W Mo粉末通过热等离子体熔化，W和Mo溶解在一起，形成固溶体，并在TPS期间进行粉末致密化。通过优化工艺条件，球化W钼合金粉末具有均匀的元素分布，低氧含量（〜0.08％）和良好的流动性（10 s / 50 g），可以满足激光粉末床熔合（LPBF）的需求。值得注意的是，基于球化的W Mo合金粉末，LPBF可以制造几乎完全致密的W Mo合金，几乎没有孔。