2011•Gongneng cailiao yu qijian xuebaoRequires access
Study on the Sintering Characteristics of SPS NdFeB Magnets
Jiuxing Zhang
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Abstract
New kind of NdFeB-based permanent magnets named as SPS NdFeB magnets were prepared by using spark plasma sintering technique(SPS).To well comprehend the sintering characteristics of SPS NdFeB magnets with two kinds of compositions,the microstructures,magnetic properties and densities of SPS NdFeB magnets sintered at different temperature were systematically investigated by means of scanning electronic microscope(SEM),B-H loop–line instrument as well as Archimedes method,respectively.The results showed that the sintering characteristics of SPS NdFeB magnets were different from that of conventional ones,varying with the composition of samples.In detail,samples with higher rare earth compositions possess a wider range of 780-940℃ appropriate sintering temperature,in which the sintering temperature is lower,while the samples with lower rare earth compositions possess a optimal sintering temperature of 950℃.Based on results above,the mechanism of action during the late stage of sintering process was discussed.