A study on the corrosion behavior of the (Nd, MM)2(Fe, Co, Ni)14B-type sintered magnets
A study on the corrosion behavior of the (Nd, MM)2(Fe, Co, Ni)14B-type sintered magnets
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DOI：
10.1016/j.jallcom.2005.10.013
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发表时间：
2006-08
影响因子：
6.2
通讯作者：
H. M. Hosseini;A. Dadoo;A. Dolati;A. Kianvash
中科院分区：
文献类型：
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作者：
H. M. Hosseini;A. Dadoo;A. Dolati;A. Kianvash
采用二元粉末混合技术（BPBT）制备了各向异性（Nd，MM）2（Fe，Co，Ni）14B型烧结磁体（MM：为混合稀土）。中间合金的组成接近化学计量的Nd2Fe14B化合物，而烧结助剂（SA）具有MM 38.1Co 46.4Ni 15.4的组成。通过将不同比例的中间合金和烧结助剂混合制成磁体。采用动电位极化曲线测试方法，比较了它们与Nd17Fe75B8基合金在H2SO4溶液中的腐蚀行为。通过减少富Nd晶界相的量和用Co和Ni取代一些Fe原子，观察到磁体的耐腐蚀性的改善。Nd11.9MM2.9Fe73.9Co3.3Ni1.1B6.9化合物在本研究中表现出最小的腐蚀速率。
The binary powder blending technique (BPBT) was employed in production of anisotropic (Nd, MM)2(Fe, Co, Ni)14B-type sintered magnets (MM: denotes a Misch-metal). The composition of the master alloy was close to the stoichiometric Nd2Fe14B compound, while the sintering aid (SA) had a composition of MM38.1Co46.4Ni15.4. The magnets were made by blending different ratios of the master alloy and the sintering aid. The corrosion behavior of these magnets was compared with that of the Nd17Fe75B8base alloy by potentiodynamic polarization measurements in H2SO4solution. By decreasing the amount of Nd-rich grain boundary phases and substitution of some Fe atoms by Co and Ni, an improvement in the corrosion resistance of the magnets was observed. The Ndl1.9MM2.9Fe73.9Co3.3Ni1.1B6.9compound exhibited the minimum corrosion rate within this investigation.