制备了两种2∶17 R 型 Sm-Co 合金：Sm2(Fe,Cu,Zr,Co)17和纯二元Sm2 Co17,并利用高能球磨和放电等离子烧结(SPS)制备了致密的纳米晶块体合金,研究了其磁性能和相结构的变化.Sm2(Fe,Cu, Zr,Co)17具有较高的矫顽力,而纯二元 Sm2 Co17矫顽力基本为零.但高能球磨可快速降低 Sm2(Fe,Cu, Zr,Co)17合金的矫顽力.利用放电等离子烧结非晶粉末制备了纳米晶块体合金,纯二元 Sm2 Co17合金具有较高的矫顽力,并且具有1∶7 H 相结构.而 Sm2(Fe, Cu,Zr,Co)17合金则因为 Fe-Co 相及 Sm2 O3相的析出,具有较高的饱和磁化强度和极低的矫顽力.
Two kinds of Sm-Co alloys with a 2∶17R structure were prepared by arc-melting:Sm2 (Fe,Cu,Zr, Co)17 and Sm2 Co17 .Bulk nanocrystal magnets of these two alloys were prepared by applying high energy ball milling and spark plasma sintering,and their magnetic properties and phase composition were also studied. Sm2 (Fe,Cu,Zr,Co)17 alloy has a high coercivity,but Sm2 Co17 has a very low coercivity.However,coercivity of Sm2 (Fe,Cu,Zr,Co)17 could be deteriorated quickly by ball milling.Bulk nanocrystal magnets were prepared by sintering the amorphous powders using SPS.Bulk nanocrystal Sm2 Co17 magnet has a high coercivity and a struc-ture of single 1∶7 H.On the other hand,Sm2 (Fe,Cu,Zr,Co)17 alloy has a higher Ms but a coercivity of about zero due to the formation of Fe-Co and Sm2 O3 phases during sintering.
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