摘要
增材制造(3D打印)作为一种新型的近净成型技术,有望实现磁制冷工质的快速、高效、复杂成型。然而,制备出球形度高、尺寸小、磁热性能优异的磁热合金球形粉是目前制约其3D打印成型的瓶颈问题。本研究采用气体雾化法成功制备出了(Mn,Fe)_(2)(P,Si,B)多元合金球形雾化粉,借助扫描电子显微镜、X射线衍射仪、综合物性测量系统等深入研究了其显微形貌、晶体结构、磁相变行为以及磁热性能。本研究所获得的球形粉球形度高,有望使粉料在3D打印过程具有较高的流动性;所得球形粉颗粒尺寸小、尺寸分布窄,有利于激光3D打印工件获得高致密度和高尺寸精度;第二相含量低、热滞小、熵变值大,具有优异的磁热性能。由此可见,本研究获得的球形雾化粉十分适合3D打印等新型制造领域,为室温磁制冷材料的加工和成型提供新的思路,推动其产业化之路。
Additive manufacturing (3D printing), a novel near-net shape manufacturing technique, offers a rapid and efficient way to fabricate complex magnetocaloric heat exchangers. However, the syn-thesis of magnetocaloric powders with a small particle size, spherical shape and good magnetocaloric properties becomes the bottleneck for the implementation of 3D printing. In the present work, spherical-shaped (Mn,Fe)2(P,Si,B) magnetocaloric powders have been successfully synthesized via gas atomization. The morphology, crystal structure, magnetic phase transition behavior and the magnetocaloric properties have been studied using scanning electron microscope, X-ray diffractometer and physical property measurement system. The gas-atomized powders are highly spherical shaped, which benefits the mobility of the powders during the 3D printing process. The small particle size with a narrow size distribution is good for increasing the spatial resolution and the density of the printed heat exchangers. Besides that, the gas-atomized powders show a small thermal hysteresis and excellent magnetocaloric properties. Additionally, the weight fraction of the secondary phase is relative low in the gas-atomized powders, which will not dilute the magnetocaloric properties of the main phase. Consequently, the synthesized gas-atomized powders are well suited for the 3D printing processing, which provides a new horizon for manufacturing magnetocaloric materials and thus paves the way for magnetic refrigeration applications.
作者
张怡临
王星仪
陈楚尧
王文尧
胡述圆
徐桂舟
缪雪飞
徐锋
Yilin Zhang;Xingyi Wang;Chuyao Chen;Wenyao Wang;Shuyuan Hu;Guizhou Xu;Xuefei Miao;Feng Xu(MIIT Key Laboratory of Advanced Metallic and Intermetallic Materials Technology,School of Materials Science and Engineering,Nanjing University of Science and Technology,Nanjing Jiangsu)
出处
《应用物理》
CAS
2020年第3期191-197,共7页
Applied Physics
基金
国家自然科学基金(资助号51801102,U1832191)
江苏省自然科学基金(资助号BK20180491)
南京理工大学大型仪器设备开发基金以及国家级大学生创新创业训练计划项目(201910288095Z)的经费支持。
