LIU Wei WANG Qun ZHAO Xinguo ZHAO Tong ZHANG Zhidong SUN Xiaokai Institute of Metal Research
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Academia Sinica
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Shengyang
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China research assistant
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Institute of Metal Research
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Academia Sinica
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Shenyang 110015
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China
金属学报(英文版)
Using pure Sm and Fe powders as starting materials,high coercive Sm-Fe-N mag- nets have been prepared by mechanical alloying in combination with beat treatment and nitriding.The best result is:_iH_c=33.1 kA/cm(41.6 kOe)and(BH)_(max)=98.7 kJ/cm~3(12.4 MGOe).The phases formed in the specimens during mechanical alloying, crystallizing and nitriding processes were examined by X-ray diffraction technique.The magnetic properties of the specimens were measured with the pulsed magnetometer in field up to 12 T.Experimental results show that mechanical alloying is an efficient ap- proach for preparing high coercive magnets.As an important factor for obtaining a high coercivity,the grain sizes of magnets are about tens of nanometer.The presence of some soft magnetic phases in the specimens leads to a neck on the demagnetization curve.
关键词:
Sm-Fe-N magnet
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