磁力搅拌法的研究与开发

Research and development of magnetic force agitation

介绍了一种用于搅拌金属复合熔体的磁力搅拌法 ,洛仑兹力是由高速旋转的永磁体磁场产生的 .分析了NbFeB永磁体在空间的磁感应强度分布情况 .研究表明 :磁感应强度的大小在空间分布类似于鞍形 ,在高度方向上衰减很快 ;磁场转速对磁力搅拌效果影响明显 ,涡旋磁场与金属熔体间的偏置度为 2 5mm时 ,增强颗粒较易加入 ;用磁力搅拌法搅拌复合熔体具有力源与熔体无直接接触 ,对熔体无污染 ,磁场具有可设计性 。

Discusses the use of magnetic force agitation to stir mult melt to produce particulate reinforced metal matrix composites with lorentz force generated by highly rotating permanent magnetic field, and concludes that the magnitude of magnetic flux density shaped like a saddle and decreased quickly along the axis direction, the rotating velocity of stirrer has important effect on the magnetic stirring force, when the degree of divergemence between magnetic field and melt were about 25 mm, particulate was added into the melt easily. The multi melt stirred by magnetic force has such advantages as the melt has not direct contact with source of force, melt was therefore not polluted and the cost of equipment and manufacture were low.