论文标题
非化学计量对HOB2气体颗粒的磁化特性的影响
Effect of Non-stoichiometry on Magnetocaloric Properties of HoB2 Gas-Atomized Particles
论文作者
论文摘要
我们通过HOB2-X（X = -0.3、0、0.3和1.0）的电感熔化电极杆制造气体颗粒，并研究了非岩石计量学对相位分数，微结构和物理特性的影响。将电极杆的化学计量比转移到B（HO）-rich侧会增加产生的原子颗粒中的HOB4（HO）相。即使雾化颗粒包含杂质阶段的15-20重量百分比（wt。％），其影响对物理性质的影响不太严重：与HOB2.0粒子相比，磁熵变化的最大值仅降低10％。我们进一步发现，延性HO相存在，以填充雾化颗粒中脆性HOB2相之间的空间，这可能对颗粒的机械性能有益。我们的发现表明，使用富含HOH的电极杆比化学计量计的棒子生产具有更合适的特性作为磁制冷系统的磁制冷剂的HOB2-X颗粒会更好。
We fabricate gas-atomized particles by inductively melting electrode rods of HoB2-x (x = -0.3, 0, 0.3, and 1.0) and investigate the effect of non-stoichiometry on the phase fraction, microstructure, and physical properties. Shifting the stoichiometric ratio of the electrode rod to the B (Ho)-rich side increases HoB4 (Ho) phase in the resulting atomized particles. Even if the atomized particles contain 15-20 weight percent (wt.%) of the impurity phase, the influence of which on the physical properties is less severe: the maximum value of the magnetic entropy change is only reduced by 10% compared to HoB2.0 particles. We further find that the ductile Ho phase exists so as to fill the space between the brittle HoB2 phases in the atomized particles, which may be beneficial to the mechanical properties of the particles. Our findings suggest that it would be better to use the Ho-rich electrode rods than the stoichiometric ones to produce HoB2-x particles with more suitable properties as a magnetic refrigerant for magnetic refrigeration systems.
