In this study, a novel low pressure sintering method for mass industrial preparing Nd-Fe-B magnets with high performance was proposed. The results indicated that the properties of magnets can be greatly enhanced via low-pressure sintering method by tuning the grain size and rich-RE phase distribution. Under the combined effects of pressure and temperature, the flowability of rich-RE liquid phase was enhanced and which made it easy to achieve liquid phase sintering process, resulting in the close theoretical density and high performance of the sintered magnets. The optimum properties (B_r = 14.10kGs, H_cj = 14.11kOe and (BH)_max = 46.47MGOe) were obtained at the sintering temperature of 980 °C under 2.0 MPa gas pressure field, which is far below the conventional manufacturing temperature for commercial Nd-Fe-B magnets (1060 °C). This work could offer a valuable method to obtain sintered Nd-Fe-B magnets with superior microstructure and excellent properties.

在这项研究中，提出了一种新颖的低压烧结方法，用于大规模工业制备高性能的Nd-Fe-B磁体。结果表明，通过调整粒径和富稀土相分布，采用低压烧结方法可以大大提高磁体的性能。在压力和温度的共同作用下，富稀土液相的流动性得到增强，使其易于实现液相烧结过程，从而获得了紧密的理论密度和高性能的烧结磁体。最佳特性（B _r = 14.10kGs，H _cj = 14.11kOe和（BH）_max在2.0 MPa气体压力场下，在980°C的烧结温度下获得了46.47MGOe）（该温度远低于商用Nd-Fe-B磁体的常规制造温度（1060°C））。这项工作可以提供一种有价值的方法来获得具有优良的微观结构和优良性能的Nd-Fe-B烧结磁体。