钼合金纳米喷雾掺杂工艺研究  

Nanosized Powder Spray Doping Technology of Molybdenum Alloys

作　　者：冯鹏发[1] 杨秦莉[1] 党晓明[1] 席莎[1] 赵虎[1] 

机构地区：[1]金堆城钼业股份有限公司技术中心,陕西西安710077

出　　处：《稀有金属》2017年第1期57-63,共7页Chinese Journal of Rare Metals

基　　金："十二五"国家科技支撑计划项目(2012BAE06B02);陕西省科技统筹创新工程计划项目(2015KTZDGY09-05)资助

摘　　要：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。A novel nanosized powder spray doping technology was exploited, and its two correlative test methods were investigated re- spectively. Mo-La alloy wires and sheets were prepared by the nanosized powder spray doping technology and the solid,liquid doping technology. Meanwhile, the strengthening mechanism and the evolution of microstructure of nano-doped molybdenum alloys were ob- served by transmission electron microscope （TEM） and theoretically analyzed by Fisher theory. The results showed that with the solid- liquid ratio of nanometer powder to deionized water smaller than 1 ： 20, and stirring time of 30 min, the nanosized powder suspension was prepared, and then the air pressure made the suspension spray to MoO2 powder through the nozzle with ingenious structure. During the doping processing, the suspension was always kept floating in the accessorial on-line stirring device. The two inspection methods of the dispersion situation of nanosized powders in soliquoid agents and the micro-homogeneity of doped elements in molybdenum alloy powders, which were exploited in the paper, played the role of real time control of the nanosized powder spray doping process. With the same addition of La element, the comprehensive mechanical properties and service performance of Mo-La alloys synthesized by the nanosized powder spray doping technology were about 50% higher than that of the conventional solid-liquid doping process. The TEM images of Mo-La alloys and Fisher theory showed that the nanosized powder spray doping technology was more liable to implement the homogeneous distribution of more nanometer second phase particles in molybdenum matrix compared with the other doping process, which guaranteed the effective dispersion strengthening effect.

关 键 词：纳米喷雾掺杂 弥散强化 微观均匀性 纳米粒子悬浮液 钼合金 

分 类 号：TK91[动力工程及工程热物理]