机械球磨法制备纳米晶复相Nd_2Fe_(14)B/α-Fe永磁粉末  

Permanent magnetic powder of nanocomposite Nd_2Fe_(14)B/α-Fe prepared by mechanical milling

作　　者：王迎[1] 王尔德[1] 

机构地区：[1]哈尔滨工业大学材料科学与工程学院,哈尔滨150001

出　　处：《粉末冶金材料科学与工程》2006年第1期59-62,共4页Materials Science and Engineering of Powder Metallurgy

摘　　要：通过将成分为Nd2Fe14B(原子比)的铸态合金与羰基铁粉的混合粉末进行搅拌式机械球磨,并对球磨后的合金粉末进行真空晶化处理,制备了纳米复相Nd2Fe14B/-αFe永磁合金。通过X射线衍射(XRD)、差示扫描量热法(DSC)、透射电子显微镜(TEM)等分析方法研究了球磨时间及晶化处理温度对合金微观组织的影响。结果表明,随球磨时间的延长,Nd2Fe14B相及-αFe的晶粒尺寸迅速减小,球磨5 h后粉末由Nd2Fe14B非晶相和晶粒尺寸约为10 nm左右的-αFe组成,在随后的晶化热处理过程中转变成Nd2Fe14B/-αFe纳米复相组织。Nanocomposite Nd2Fe14B/α-Fe magnetic material consisting of as-cast alloy Nd2 Fe14 B （atomic ratio） and α-Fe was prepared by mechanical milling and a subsequent crystallization vacuum annealing treatment. The effect of milling and crystallization conditions on the microstructure and magnetic properties of the material was investigated by X-ray diffractometer（XRD）, differential scanning calorimetry（DSC）, transmission electron microscopy （TEM）, respectively. It was found that the grain size of both the Nd2Fe14B and the α-Fe phase decreased drastically with increasing milling time. After milling for 5 h, the as-milled material was comprised of a Fe nanocomposite phases about 10nm in size, and some amorphous, which could be turned into Nd2Fe14B/α-Fe nanocomposite phases by the subsequent crystallization annealing treatment.

关 键 词：机械球磨 晶化处理 Nd2Fe14B/α-Fe纳米复相 晶粒尺寸 

分 类 号：TM271.3[一般工业技术—材料科学与工程]