摘要
对NdFeB合金以2000℃/s的预设升温速度在900～1100℃的温度范围内分别进行8min的电场烧结,并对烧结体的显微结构进行了研究。研究发现,随着烧结温度的升高,NdFeB合金烧结坯体的致密性逐渐提高。当烧结温度升至1050℃时,富Nd相细小、弥散、分布均匀,并显示出比传统方法烧结磁体更为优良的显微结构。随着烧结温度的继续上升,富Nd相出现明显的聚集,烧结体中逐渐出现粗大的枝晶状α-Fe。结果表明,当NdFeB合金以2000℃/s的预设升温速度进行电场烧结时,其最佳烧结温度为1050℃,此时烧结体的磁能积为249kJ/m3。
NdFeB alloys were sintered by an electric field under the conditions of preestablished rising temperature rate of 2000 ℃/s, sintering temperatures of 900-1100 ℃, sintering time of 8 rain, and microstructures of sintered magnets were also studied. It is found that the compactness of NdFeB sintered magnet is gradually improved with the rise of sintering temperature. When the sintering temperature arrives at 1050 ℃, Nd-rich phases in magnet are small, dispersed, and uniformly distributed, and the magnet has better microstructure than traditional sintering magnet. When the sintering temperature unceasingly rises, Nd-rich phases are obviously assembled, and bulky α-Fe dendrites appear in the magnet. These results indicate that when NdFeB alloy is sintered by an electric field at the preestablished rising temperature rate of 2000 ℃/s, its best sintering temperature is 1050 ℃ and the maximal energy product of the sintered magnet is 249 kJ/m^3.
出处
《稀有金属材料与工程》
SCIE
EI
CAS
CSCD
北大核心
2010年第A01期122-125,共4页
Rare Metal Materials and Engineering
基金
成都市高新技术项目资助(05HJGX099)
关键词
NDFEB合金
电场烧结
烧结温度
显微结构
NdFeB alloy
electric field sintering
sintering temperature
microstructure
