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.
出处
《粉末冶金技术》
EI
CAS
CSCD
北大核心
2007年第3期213-216,223,共5页
Powder Metallurgy Technology
