放电等离子烧结技术制备Sm_2Fe_(17)N_x烧结磁体的研究  

Study of Sm_2Fe_(17)N_x sintered magnet fabricated by spark plasma sintering

作　　者：张东涛[1] 岳明[1] 张久兴[1] 

机构地区：[1]北京工业大学新型功能材料教育部重点实验室,北京100022

出　　处：《粉末冶金技术》2007年第3期213-216,223,共5页Powder Metallurgy Technology

摘　　要：采用放电等离子烧结技术制备了Sm2Fe17Nx烧结磁体,考查了压力、烧结温度和升温速率对烧结磁体性能的影响。结果表明:随压力的增加,磁体的致密度显著提高,但Sm2Fe17Nx分解成SmN、α-Fe和N2的程度加剧,造成磁体的矫顽力明显下降,在1GPa的高压下烧结时,超过200℃后磁体的矫顽力就下降很快,说明高压促进了Sm2Fe17Nx的低温分解;采用升温速率为450℃/min的快速烧结工艺,发现未能有效地抑制Sm2Fe17Nx的分解。Sm2Fe17 Nx sintered magnet was fabricated by spark plasma sintering （SPS）technique. The effects of sintering pressure, sintering temperature and rapid heating on the magnetic properties of Sm2Fe17 Nx magnet were investigated. The results show that the density of the magnets are obviously improved with the increase of sintering pressure, but the coercivity of the magnets drop distinctly since Sm2 Fe17t Nx decomposed into SmN, α-Fe and N2. It is founded that the coercivity of the magnets also decrease rapidly when sintering temperature is above 200℃ under 1GPa sintering pressure, which indicates that high pressure promote the decomposition of Sm2Fe17 Nx at low temperature.And the decomposition of Sm2Fe17 Nx can not be effectively restrained by using rapid sintering at 450℃/min.

关 键 词：放电等离子烧结 SM2FE17NX 磁体 高压烧结 

分 类 号：TQ133[化学工程—无机化工]