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http://dx.doi.org/10.4283/JKMS.2002.12.5.189

Effect of Magnetic Properties on the Zr contents of Sm(CO.688-xFe.242Cu.07Zr x)7.404 Sintered Magnets  

Jung, Woo-Sang (한국과학기술연구원, 금속공정센터)
Kim, Yoon-Bae (한국과학기술연구원, 금속공정센터)
Jeung, Won-Young (한국과학기술연구원, 금속공정센터)
Publication Information
Journal of the Korean Magnetics Society / v.12, no.5, 2002 , pp. 189-194 More about this Journal
Abstract
Microstructure and magnetic properties of Sm-Co sintered magnet were investigated with the variation of Zr content and their solution treatment and aging temperatures. The fraction of eutectic structure and the size of eutectic area decreased with increasing x value of cast Sm(C $O_{.688-x}$F $e_{.242}$C $u_{.07}$Z $r_{x}$)$_{7.404}$ alloys. On the other hand, x=0.022 ingot had finer dendritic structure compared to the other alloys. The sintered magnet of Sm(C $O_{.688-x}$F $e_{.242}$C $u_{.07}$Z $r_{x}$)$_{7.404}$ had well defined cell structure which is composed of cell boundary Sm $Co_{5}$ and cell interior S $m_2$Co/ssub 17/ phase. Cell boundary Sm $Co_{5}$ phase has 20nm thickness and its relative angle was 120$^{\circ}$ in x=0.018 and 0.022 alloys. Cell size was decreased with increasing Zr contents. But, x=0.026 alloy has diffuse cell boundary and irregular shape compared to x=0.022 and 0.018 alloys. Maximum value of coercive force and maximum energy Product were obtained from x=0.022 alloys. Optimum solution treatment temperature of Sm(C $O_{.688-x}$F $e_{.242}$C $u_{.07}$Z $r_{x}$)$_{7.404}$ alloy was 1170 $^{\circ}C$ and 1st aging temperature of two step aging process for higher coercivity was 850 $^{\circ}C$.
Keywords
Sm-Co; Sm-Co; Sintered magnets; Microstructure; Magnetic properties;
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