Liu Xiaoping, Wang Kuaishe, Chen Qiang, Zhang Bing, Hao Pengcheng, Wang Yuhao, Wang Qiang
School of Metallurgical Engineering, Xi'an University of Architecture and Technology, Xi'an 710055, China.
National and Local Joint Engineering Center of Functional Materials, Xi'an 710055, China.
Materials (Basel). 2022 Mar 9;15(6):2019. doi: 10.3390/ma15062019.
Spherical molybdenum nano-powders were in-situ ultrafast synthesized from ammonium paramolybdate (APM) raw materials in a one-step reduction method by radio frequency (RF) hydrogen plasma. Due to the extreme conditions of the RF plasma torch such as its high temperature and large temperature gradient, the injected raw APM powder was quickly gasified and then reduced into nano-sized metal molybdenum (Mo) powder. The influences of APM powder delivery rate and H concentration on the properties of the obtained powders were investigated. Field-emission scanning electron microscope (FESEM), transmission electron microscope (TEM), X-ray diffraction (XRD), nanolaser particle analyzer, and specific surface area method were used to characterize the morphology, phase, and particle size distribution of the powders. The results showed that the nano-sized Mo powder obtained by hydrogen plasma treatment had a quasi-spherical morphology and an average particle size of about 30 nm. The particle size could be successfully adjusted by varying H concentrations. In addition, spherical nano-sized MoO powder could be obtained when no H was added into the RF plasma.
采用射频（RF）氢等离子体一步还原法，以仲钼酸铵（APM）为原料原位超快合成了球形钼纳米粉末。由于射频等离子体炬的极端条件，如高温和大温度梯度，注入的原始APM粉末迅速气化，然后还原成纳米级金属钼（Mo）粉末。研究了APM粉末输送速率和H浓度对所得粉末性能的影响。用场发射扫描电子显微镜（FESEM）、透射电子显微镜（TEM）、X射线衍射（XRD）、纳米激光粒度分析仪和比表面积法对粉末的形貌、相和粒度分布进行了表征。结果表明，氢等离子体处理得到的纳米Mo粉末具有准球形形貌，平均粒径约为30nm。通过改变H浓度可以成功地调整粒径。此外，当不向射频等离子体中添加H时，可以得到球形纳米MoO粉末。
