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开发出一种钼合金纳米喷雾掺杂工艺及其过程控制方法;采用传统固-液掺杂工艺和纳米喷雾掺杂工艺分别制备出Mo-La合金丝材和板材,并测试其室温力学性能和使用性能;采用透射电镜(TEM)和经典弥散强化理论,分析了纳米掺杂钼合金强韧化机制。结果表明,按照1∶20的纳米粉末与去离子水的最大固液质量比、经过30 min搅拌制备的纳米悬浮液在在线搅拌装置和空气压力作用下,通过适当结构的喷头喷淋到Mo O2粉末中,可实现钼合金的纳米掺杂;液体介质中纳米粉末离散稳定性检测方法和钼合金粉末中掺杂元素微观均匀性检测方法可对纳米喷雾掺杂工艺的制备过程实现实时控制;在相同成分下,纳米喷雾掺杂工艺制备的Mo-La合金丝、板材的综合力学性能和使用寿命均比固-液掺杂工艺提高50%以上。TEM照片和Fisher理论分析结果表明,纳米喷雾掺杂工艺实现了第二相粒子以纳米尺度均匀分布,第二相粒子的尺寸、数量和分布均匀程度远优于固-液掺杂工艺,从而保证了其有效发挥弥散强化作用。
Developed a molybdenum alloy nano-spray doping process and process control method; using conventional solid-liquid doping process and nano-spray doping process were prepared Mo-La alloy wire and plate, and tested at room temperature mechanical properties and The properties of toughening nano-doped molybdenum alloy were analyzed by transmission electron microscopy (TEM) and classical dispersion strengthening theory. The results show that according to the maximum solid-liquid mass ratio of nano-powder to deionized water of 1:20, nano-suspension prepared by stirring for 30 min under the action of on-line stirring device and air pressure is sprayed onto Mo O2 Powder, the nano-doping of molybdenum alloy can be realized; the detection method of dispersion stability of nano-powder in liquid medium and the micro-uniformity detection method of doping element in molybdenum alloy powder can realize the real-time control of the preparation process of nano-spray doping process; Under the same composition, the mechanical properties and service life of Mo-La alloy wire prepared by nano-spray doping process are both more than 50% higher than the solid-liquid doping process. The results of TEM and Fisher theory show that the second phase particles are uniformly distributed on the nanoscale by the nano-spray doping process, and the size, number and distribution of the second phase particles are much better than the solid-liquid doping process to ensure It effectively play the role of dispersion strengthened.