Nd与Co对Nd_2Fe_(14)B/α-Fe磁体温度稳定性影响  

Effects of Nd and Co on thermal stability of nanocomposite Nd_2Fe_(14)B/α-Fe magnets

作　　者：夏华[1] 王晨[1] 严密[1] 吴进明[1] 罗伟[1] 

机构地区：[1]浙江大学硅材料国家重点实验室,浙江杭州310027

出　　处：《浙江大学学报（工学版）》2007年第3期529-532,536,共5页Journal of Zhejiang University：Engineering Science

基　　金：国家自然科学基金资助项目(50471041)

摘　　要：为了提高纳米晶Nd2Fe14B/α-Fe磁性材料的温度稳定性,研究了不同Nd和Co原子分数对纳米双相磁体温度特性的影响.在添加Zr的基础上,使用振动样品磁强计(VSM)和XRD,研究了NdxFe93-xB6Zr1(x=9,9.5,10,10.5,11)和Nd10Fe83-xB6CoxZr1(x=2,4,6,8)的温度稳定性和磁性能.结果表明,在NdxFe93-xB6Zr1中,当Nd原子分数为10%时,合金具有最高的剩磁0.932 T、较高的矫顽力780 kA/m,以及最好的温度稳定性.在180℃时的剩磁温度系数为-0.154%/℃,矫顽力温度系数为-0.39%/℃.在Nd10Fe83-xB6CoxZr1中,随着Co原子分数的增加,剩磁温度系数的绝对值逐渐降低.当Co原子分数为4%时,合金有最好的温度稳定性.在180℃时的剩磁温度系数为-0.100%/℃、矫顽力温度系数为-0.40%/℃.To improve the thermal stability of nanocomposite Nd2Fe14 B/α-Fe magnets, the effects of Nd and Co atom fraction on thermal stability of nanocomposite two-phase magnets were investigated. Based on the addition of Zr, vibration sample magnetometer（VSM） and XRD analyse were adopted, and magnetic properties and thermal stabilities of NdxFe93-xB6Zr1 （x=9,9. 5,10,10. 5,11） and Nd10Fe83-xB6Co.Zr1 （x= 2,4,6,8） magnets were studied. Results show that the alloy with 10% Nd atom fraction has the highest remanence of 0. 932 T, higher coercivity of 780 kA/m and the best thermal stability in Nd.Fe93-.B6Zr1alloys, and that temperature coefficient of remanence is -0. 154%/℃ and temperature coefficient of coercivity is -0.39%/℃ at 180℃. For the Nd10Fe83-xB6CoxZr1 magnets, the absolute value of remanence temperature coefficient decreases with the increasing Co atom fraction. When Co atom fraction is 4%, the alloy has the best thermal stability with remanence temperature coefficient of -0. 100%/℃ and coercivity temperature coefficient of -0.40%/℃ at 180℃ .

关 键 词：纳米双相 温度特性 磁性能 显微组织 

分 类 号：TM273[一般工业技术—材料科学与工程] TG146[电气工程—电工理论与新技术]