Study on Microstructure and Magnetic Properties of Heavy Rare Earth-Free Sintered Nd-Fe-B Magnets AITranslate

2Kaihong DING, Guozheng LIU, Zhejun LI, Jieming YAN, Yingjie TAO and Bing WU (Baotou Research Institute of Rare Earth, Baotou 014010, China).High Energy and High Coercivity Sintered NdFeB Magnets by Low Oxygen Process[J].材料科学技术：英文版,2000,0(2):127-128. 被引量：5

3稀土文摘快报[J].稀土信息,2023(2):42-43.

9林信平,陈戈,陈军超,王步高,邓天有.LaAl_(11)O_(18)和Al_(2)O_(3)共同掺杂ZrO_(2)陶瓷的性能研究[J].中国锰业,2023,41(1):6-10.

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Chinese Library Classification Number:TM273[一般工业技术—材料科学与工程]

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The magnetic properties and microstructure of sintered Nd-Fe-B magnets co-doped with Ga,Al,Cu,and Zr were studied,and coercivity of the magnets was regulated by tempering process.The results show that when the first annealing is 900℃×150 min and the second annealing is 500℃×180 min,the magnet coercivity H_cjgreatly increases from 14.33 kOe in the sintered state to 19.86 kOe in the second annealing state,which is a increase of 38.6%;rectangularity H_k/H_cjincreases from 0.86 to 0.97;remanence B_rdecreases slightly from 13.51 kGs in the sintered state to 13.46 kGs in the second annealing state;the distribution of RE-rich phase becomes more continuous and obvious.The research analysis shows that the reason why the coercivity greatly increases is that Ga doped in the sintered Nd-Fe-B magnets containing small amounts of Nd-rich phase and B-poor phase changes the wettability of intergranular phase and reduces Fe content in the RE-rich phase.The study lays a solid theoretical foundation for the industrialization of heavy rare earth-free sintered Nd-Fe-B magnets with high coercivity and high remanence.