Sm_(12.8)Fe_(87.2)合金氮化前后高能球磨的研究  

Effect of high-energy ball-milling process on the Sm_(12.8)Fe_(87.2) alloys and their nitrided alloys

作　　者：孙继兵[1,2] 崔春翔[1] 吴瑞国[1] 杨伟[1] 刘玉岭[2] 

机构地区：[1]河北工业大学材料学院 [2]河北工业大学,电子科学与技术博士后流动站,天津300130

出　　处：《兵器材料科学与工程》2005年第6期5-9,共5页Ordnance Material Science and Engineering

基　　金：国家自然科学基金资助项目(50271024);河北省自然科学基金(501013)资助项目

摘　　要：用破碎法制备了Sm12.8Fe87.2合金及其氮化物,对比研究了高能球磨工艺对母合金及其氮化物粉末的形貌、组织结构 及磁性能的影响。研究发现,高能球磨细化Sm12.8Fe87.2合金粉末或Sm12.8Fe87.2Nx氮化物粉末的过程均由大粉末颗粒→压延或 断裂成层片状→断裂成小颗粒3个阶段循环组成,并均在球磨一定时间后使粉末中的Sm2Fe17型相完全非晶化,α-Fe含量增 高且没有完全非晶化。球磨细化同粒度氮化物粉末的速度比母合金粉末的快。氮化过程不改变Sm12.8Fe87.2合金粉末球磨后 的相结构。氮化物的非晶化过程应当为:Sm2Fe17Nx(晶态)→SmFeN(非晶)+α-Fe。经两种高能球磨方式得到的氮化物粉末 的矫顽力随着球磨时间的延长而降低,而剩磁与磁化强度值在球磨时间短时降低,延长时间又增高,到球磨到主相非晶化 后又降低。The Sm12.8Fe87.2alloy and its nitrided alloy are prepared by powder crushing method. The effect of high-energy ball- milling on the powder microstructure, phase and magnetic properties of Sm12.8Fe87.2Nx alloy and its nitrided alloy is investigated. It is shown that the three periodic steps to break down Sm12.8Fe87.2 powder or Sm12.8Fe87.2Nx powder by high-energy ball-milling can be described as： larger powder particles→calendering or breaking to form layers→breaking down to finer particles. The process of ball-milling for longer time promotes the Sm2Fe17-type phases to be wholly amorphous and increases the content of α-Fe, but no wholly amorphous α-Fe is found. The ball-milling speed of nitrided powder to the size of less than 5μm is faster than that of milling Sm12.8Fe87.2 powder. The nitrogenation process doesn＇t change the main phase Th2Zn17-type structure of ball-milled Sm12.8Fe87.2. The amorphous phase of Sm-Fe-N nitrided powder is formed by the reaction ：Sm2Fe17Nx（cry. ）→SmFeN（amor. ）＋α-Fe. The coercivity of powder by two different processes decreases with ball-milling time increasing. The remanence and magnetization under maximum magnetic field decreases firstly during ball-milling time, and then increases with ball-milling time increasing, but finally decreases again after the main phase becomes amorphous.

关 键 词：Sm2Fe17型合金 高能球磨 形貌 物相 磁性能 

分 类 号：TF132.272[冶金工程—冶金物理化学] TM271.3[一般工业技术—材料科学与工程]