定量描述了Nd-Fe-B磁体烧结过程晶粒长大行为,分析了烧结温度、烧结时间、合金粉末粒度及其分布对烧结过程晶粒长大的影响,讨论了烧结过程晶粒长大机制.在Nd-Fe-B磁体烧结过程开始之后的0～1 h时间区段,晶粒长大迅速;随着烧结时间的延长,晶粒长大速度减小.合金粉末平均粒度增大,或者合金粉末粒度分布范围增宽,显著促进Nd-Fe-B磁体烧结过程中晶粒的长大.在Nd-Fe-B磁体的烧结过程中,存在两类晶粒长大机制,即Nd2Fe14B颗粒的溶解与析出、Nd2Fe14B颗粒的并合与长大.Nd2Fe14B颗粒的并合与长大不仅使磁体的平均晶粒尺寸增大,也使晶粒尺寸分布范围增宽,是烧结Nd-Fe-B磁体显微组织中出现异常大晶粒的根本原因.
参考文献
| [1] | Takahashi M.;Taniguchi F.;Mikamoto T.;Uchida K. .High performance Nd-Fe-B sintered magnets made by the wet process[J].Journal of Applied Physics,1998(11 Pt.2):6402-6404. |
| [2] | 刘湘涟,何建平,周寿增,董清飞.烧结NdFeB磁体镀层缺陷分析[J].磁性材料及器件,2001(01):5-8. |
| [3] | 周寿增;董清飞.超强永磁体-稀土铁系永磁材料[M].北京:冶金工业出版社,1999:94. |
| [4] | Fidler J.;Schrefl T. .OVERVIEW OF ND-FE-B MAGNETS AND COERCIVITY[J].Journal of Applied Physics,1996(8 Pt.2a):5029-5034. |
| [5] | Knoch K.G.;Schneider G. .Al-doped Nd-Fe-B permanent magnets: wetting and microstructural investigations[J].IEEE Transactions on Magnetics,1989(5):3426-3428. |
| [6] | Jezierska E.;Kaszuwara W. .TEM study of inhomogeneities in Nd-Fe-B sintered magnets[J].IEEE Transactions on Magnetics,1994(2):580-582. |
| [7] | Courtney T H .A reanalysis of the kinetics of neck growth during liquid phase sintering[J].Metallurgical and Materials Transactions A:Physical Metallurgy and Materials Science,1977,8A:671. |
| [8] | Courtney T H .Microstructural evolution during liquid phase sintering:Part 1.Development of microstructure[J].Metallurgical and Materials Transactions A:Physical Metallurgy and Materials Science,1977,8A:679. |
| [9] | Courtney T H .Microstructural evolution during liquid phase sintering:Part 2.microstructural coarsening[J].Metallurgical and Materials Transactions A:Physical Metallurgy and Materials Science,1977,8A:685. |
| [10] | Park H D;Baik W H;Yoon D Y et al.The effect of Mo addition on the liquid-phase sintering of W heavy alloy[J].Metallurgical and Materials Transactions A:Physical Metallurgy and Materials Science,1996,27A:3120. |
| [11] | 毛卫民;赵新兵.金属的再结晶与晶粒长大[M].北京:冶金工业出版社,1994:80. |
| [12] | Takajo S;Kaysser W A;Petzow G .Analysis of particle growth by coalescence during liquid phase sintering[J].Acta Materialia,1984,32(01):107. |
上一张
下一张
上一张
下一张
计量
- 下载量()
- 访问量()
文章评分
- 您的评分：
-
10%
-
20%
-
30%
-
40%
-
50%