NdFeCoBZrGa合金各向异性磁粉的制备

Preparation for NdFeCoBZrGa Alloys Anisotropic Magnetic Powder

HDDR(氢化-歧化-脱氢-再结合)工艺是一种用于生产各向异性Nd2Fe14B基磁粉的有效方法.主要研究了真空HDDR工艺(即合金在真空中以较快速率加热到820℃左右,然后在一定的氢气压力下吸氢歧化)及添加合金元素Ga对Nd13Fe64.4-yCo16B6.5Zr0.1Gay(y=0.1,0.3,0.5,1.0)合金磁性能的影响规律.结果表明,真空HDDR工艺的吸氢歧化阶段是促使材料产生磁各向异性的关键,脱氢阶段采用低真空高温制度是材料获得高各向异性的保证;合金元素Ga有助于细化主相晶粒,提高材料的综合磁性能,其最佳原子分数添加量为0.5%;成分为Nd13Fe63.9Co16B6.5Zr0.1Ga0.5的合金经真空HDDR工艺处理,其最佳磁性能为:iHc=1 018 kA.m-1,Br=1.32 T,(BH)max=118.6 kJ.m-3,DOA=0.787.

HDDR （ hydrogenation-disproportionation-desorption-recombination ） process is an effective means by which the anisotropic Nd2Fe14 B-base magnetic powder can be prepared. vacuum HDDR process, i.e. the alloy is heated to the temperature about 820 ℃ in vacuum and then HD reactions occur under the certain hydrogen press are with the addition of the alloying element Ga affects the magnetic properties of Nd13Fe64.4-yCo16B6.5Zr0.1 Gay （y = 0.1,0.3,0.5, 1.0） alloy was studied. The results indicated that in the vacuum HDDR process, the HD steps are the key to spur the alloy on to anisotropy, and applying the low-vacuum high-temperature schedule to the desorption step will make sure that the alloy is anisotropic. The alloying element Ga contributes to refining the grains of main phase and improving the comprehensive magnetic properties of the alloy, of which the best atom fraction is 0.5 %. Treated by the vacuum HDDR process, the Nd13Fe63.9Co16B6.5Zr0.1Ga0.5 alloy provides its best magnetic properties, i.e. iHc = 1018kA·m^-1, Br=1.32T, （BH）max=1 18.6kJ·m^-3 and DOA=0.787.