烧结钕铁硼磁体生产中碳杂质来源分析  

Analysis on the source of C impurity in sintered Nd-Fe-B magnets

作　　者：胡小杰 卓剑虹 徐峰 童斐 易鹏鹏 邵海波 梁树勇 HU Xiao-jie;ZHUO Jian-hong;XU Feng;TONG Fei;YI Peng-peng;SHAO Hai-bo;LIANG Shu-yong(Ningbo Songke Magnetic Material Co,Ltd,Ningbo 315517,China)

机构地区：[1]宁波松科磁材有限公司,浙江宁波315517

出　　处：《磁性材料及器件》2019年第1期35-39,共5页Journal of Magnetic Materials and Devices

摘　　要：用常规生产工艺制备烧结钕铁硼磁体,应用碳硫含量分析仪进行碳元素检测,分析了生产过程中包括原材料、熔炼、氢爆碎、气流磨制粉(抗氧化剂)、成型机烧结等各工序环节引入的碳杂质。结果表明,相对于原材料中仅80～100 ppm的碳杂质,熔炼过程会引入约100 ppm的碳;气流磨过程引入碳含量约150 ppm;抗氧化剂引入约280 ppm碳;等静压引入的碳约40 ppm。这打破了人们对于烧结钕铁硼中碳杂质主要来自于抗氧化剂的认识。研究结果为减小磁体C含量,从而制备高性能磁体提供指导。Sintered Nd-Fe-B magnet was produced by conventional processes.The content of C impurities introduced in various production stages in sintered NdFeB is studied with carbon/sulfur analyzer.It turns out that the stage of strip casting would introduce about 100 ppm carbon impurities against the content of 80-100 ppm in raw materials,jet milling adds about another 150 ppm C,antioxidant contributes about 280 ppm;CIP increases C by about 40 ppm.This discovery is contrary to the common knowledge that most of carbon impurities in sintered Nd-Fe-B magnets are derived from antioxidants.The study is of guidance for decreasing C impurity to produce high performance Nd-Fe-B magnets.

关 键 词：烧结钕铁硼 碳杂质 工艺 抗氧化剂 

分 类 号：TM273[一般工业技术—材料科学与工程]