过量流失 meaning in English

excessive bleed

The main reason are as following : on one hand , the nd - rich phases in the hydrogen desorpted powders is so brittle that they are easily milled too fine and some are run off seriously , and then inducing low density . on the other hand , the alignment of the magnets prepared by hydrogen desorption are much low . so the hydrogen desorption process should be modified , and the solution methods can be the substitution of traditional ingots with strip cast , the enhancement of the alignment magnetic field and the addition of nd - rich phase or ( and ) lubricant before the press
主要原因是hd磁粉中的富钕相较脆，在球磨时容易被磨成超细粉而造成过量流失和使磁体烧结不够致密；另外一个原因是hd法烧结磁体的易磁化轴的取向度较低，为了提高hd磁体的b _ r和( bh ) _ ( max )可对hd工艺进行改进，改进的方法可以是用铸片代替铸锭，提高成型磁场强度以及在磁粉成型前加富钕相和润滑剂。