改进HDDR工艺制备NdFeCoZrBGa各向异性磁粉

HDDR(氢化-歧化-脱氢-重组)工艺是一种用于生产各向异性Nd2Fe14B基磁粉的特殊方法。本文主要研究了添加微量含金元素Ga、采用改进HDDR工艺(即在HD处理及高真空脱氢处理之间加上低真空脱氢处理)对Nd11.2Fe66.5-xCo15.4B6.8Zr0.1Gax(x=0、0．1、0．3、0．5、1．0)合金磁性能的影响规律。结果表明．改进HDDR工艺对于提高磁粉性能,细化主相晶粒尺寸非常有效。微量合金元素Ga的添加可显著地改变材料歧化分解的特征,同时可提高磁粉的磁性能。由改进HDDR工艺制得磁粉主相晶粒尺寸明显小于由传统HDDR工艺制得磁粉主相晶粒尺寸。

Anisotropic NdFeCoZrBGa magnet powder produced by HDDR process

The HDDR (hydrogenation-disproportionation-desorption-recombination) process was a special method to produce anisotropic Nd_2Fe_(14)B-based magnet powder. The magnetic properties of Nd_(11.2)Fe_(66.5-x)Co_(15.4)B_(6.8)Zr_(0.1)Ga_x(x=0, 0.1, 0.3, 0.5, 1.0) alloys after the modified HDDR (i.e., low vacuum dehydrogen treatment was appended between HD treatment and high vacuum dehydrogen treatment) and the appending of microelement Ga have been investigated. It was found that the modified HDDR process was very effective to enhance magnetic properties of the powder and to fine main phase grain size. The appending of microelement Ga could change the disproportionation character remarkably of the alloy and could improve the magnetic properties of the magnet powder. The main phase grain size of the magnet powder produced by modified HDDR process was significantly smaller than those produced by conventional HDDR process.