辊速及晶化工艺对(Nd,Pr)_(13)Fe_(80)Nb_1B_6快淬薄带组织和矫顽力的影响  

Effects of Wheel Velocity and Subsequent Crystallization on the Microstructures and Coercivities of (Nd,Pr)_(13)Fe_(80)Nb_1B_6 Melt-Spun Ribbons

作　　者：刘新才[1,2,3] 郭鹏举[1,2,4] 潘晶[1,2] 徐峰[1] 李勇[2] 崔平[2] 

机构地区：[1]宁波大学,浙江宁波315211 [2]中国科学院宁波材料技术与工程研究所,浙江宁波315040 [3]南昌航空大学,江西南昌330063 [4]中国科学院固体物理研究所,安徽合肥230031

出　　处：《稀有金属材料与工程》2009年第11期2027-2031,共5页Rare Metal Materials and Engineering

基　　金：国家重大基础研究前期专项(2004CCA04000);国家自然科学基金(50744014);浙江省科技计划重点项目(2008C21046);浙江省自然科学基金(Y406389);江西省重要学科跨世纪学术和技术带头人培养计划资助项目(CA99110901);宁波市科技攻关项目(2006B100054);宁波大学王宽诚幸福基金

摘　　要：用熔体快淬法制备（Nd,Pr）13Fe80Nb1B6快淬薄带并晶化处理,研究辊速和晶化条件对其组织和矫顽力的影响。结果表明,在10-20、25和35m/s分别得到纳米晶、部分非晶和完全非晶薄带,且在18m/s制备的薄带有较好的c轴各向异性。快淬态薄带的矫顽力随辊速（10-25m/s）的增大而增加。非晶薄带晶化后由（Nd,Pr）2Fe14B相和富稀土相组成,且完全非晶薄带晶化后比部分非晶薄带晶化后的矫顽力要高,这是由于前者比后者具有更均匀的微结构造成的。非晶薄带晶化后矫顽力最大为1616kA/m,高的矫顽力与添加Pr和Nb有关。（Nd,Pr）13Fe80Nb1B6 ribbons were melt-spun at 10-35 m/s and subsequently crystallized, the effect of wheel velocity and crystallization conditions on the microstructures and coercivities were studied. The XRD results indicate that the ribbons spun at 10-20 m/s consist of （Nd, Pr）：Fe14B nano-crystalline phase, while the ribbons spun at 25 and 35 m/s are partly and fully amorphous, respectively. In addition, the （004）, （006） and （008） peaks of （Nd, Pr）2Fe14B are obvious on the ribbons spun at 18 m/s, suggesting the c-axis anisotropy. The coercivity of the ribbons prepared at 10-25 m/s increases with the increase of wheel velocity, with the maximum of 1216 kA/m at 25 m/s. After the ribbons spun at 25 m/s and 35 m/s are crystallized, the （Nd, Pr）2Fe14B phase and rich-rare earth phase are co-existed. And the coercivities of the ribbons spun at 35 m/s are much higher and with more homogeneous microstructures than those at 25 m/s. The maximum eoercivity, 1616 kA/m, is obtained in the ribbons spun at 35 m/s after crystallizing at 973 K for 19 min due to the Pr and Nb addition. Because the Pr2Fe14B has a higher anisotropic coercive field than that of Nd2Fel4B, and the Nb element can inhibit the formation of α-Fe phase and refine the sizes of grains.

关 键 词：辊速 晶化 矫顽力 富稀土合金 

分 类 号：TM273[一般工业技术—材料科学与工程]