磁性蓄冷材料HoCu_2雾化粉末的制备研究

Research on Preparation of Magnetic Regenerator Material HoCu_2 Atomized Powders

采用旋转盘离心雾化设备制备磁性蓄冷材料HoCu2粉末，并对粉末的物相结构及组织形态进行系统研究。结果表明：雾化粉末为单相的HoCu2结构，粉末尺寸基本服从正态分布。粒径Ф〈154μm小尺寸粉末的比例接近30％，粒径Ф在154～300μm的合格粉末的比例最高，收得率在61％以上，此部分粉末主要以球形颗粒为主，且随着颗粒尺寸的增加，微观组织的晶粒尺寸呈增大趋势。大尺寸粉末（Ф〉300μm）的比例很低，仅为9％左右，此部分粉末主要以片状颗粒为主，其微观组织为细小的等轴状晶粒结构。

The powders of magnetic regenerator material HoCu2 was prepared by rotating disk centrifugal atomization, and the phase and microstructure of powders were studied. Results showed that the powders were consisted of HoCu2 single phase. And the particle size obey normal distribution. The proportion of powders less than Ф154 μm was near 30%. While the yielding rate of powders between Ф154μm-300μm was more than 61%, these powders were mainly spherical. The grain size increased with increased particle size. The proportion of powders greater than Ф300μm was as low as 9 %, most of which were flakes with microstructure of fine equiaxed grains.