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Production of (Nd,MM)2(Fe,Co,Ni)14B-type sintered magnets using a binary powder blending technique
Madaah Hosseini, H. R ; Sharif University of Technology | 2000
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- Type of Document: Article
- DOI: 10.1016/S0925-8388(99)00667-2
- Publisher: Elsevier Science S.A , 2000
- Abstract:
- The anisotropic (Nd,MM)2(Fe,Co,Ni)14B-type magnets were produced using the binary alloy sintering method (MM denotes a Misch-metal). The composition of the master alloy was close to stoichiometric Nd2Fe14B compound, while that of the sintering aid was MM38.2Co46.4Ni15.4. The microstructures of sintered magnets were investigated using a scanning electron microscope (SEM) equipped with an energy dispersive X-ray detector (EDX). X-ray diffractometry (XRD) was also employed for phase analysis. The optimum magnetic properties were obtained for a composition of Nd11.9MM2.9Fe73.9Co3.3Ni1.1B6.9 made of 90 wt.% master alloy and 10 wt.% sintering aid. The two main phases, i.e. the (RE)2(TM)14B phase as the matrix and the rare-earth rich phase as the grain boundary phase, were identified in the specimens. No Nd1.1Fe4B4 boride phase was observed in these samples, while there was some Fe-rich phase in the specimens with lower amount of sintering aid. The permanent magnet properties of the specimen in the optimum condition were as follows: Br = 11.2 kG, Hcj = 11.5 kOe and (BH)max = 32 MGOe with a Curie temperature of 351 °C
- Keywords:
- Nd–Fe–B alloys ; Permanent magnet materials ; Binary alloy sintering method
- Source: Journal of Alloys and Compounds, Lausanne ; Volume 298, Issue 1-2 , 2000 , Pages 319-323 ; 09258388 (ISSN)
- URL: https://www.sciencedirect.com/science/article/abs/pii/S0925838899006672