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氫對Nd—Dy—Fe—B磁體制作過程的影響
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TM271

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湖南省自然科學基金資助(資助號00JJY2042)


Effect of Hydrogen on the Process of Nd-Dy-Fe-B Magnets
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    摘要:

    研究了氫對Nd-Dy-Fe-B磁體制作過程的影響，主要包括氫對HD磁粉的氧化和對其后燒結磁體磁性能的影響。研究表明，氫不利于HD磁粉的氧化穩(wěn)定性能，氫的存在促進磁粉吸濕和電化學腐蝕，加快氧的擴散。HD磁粉經(jīng)過在一定溫度下真空脫氣處理后，氧化穩(wěn)定性提高，特別是在較高溫度下進行脫氣處理的磁粉。氫的存在使磁粉容易粉碎，加快磁體的燒結過程，降低磁體的燒結溫度。同時發(fā)現(xiàn)，未脫氫磁體的取向度較低。

    Abstract:

    Hydrogen Decrepitation (HD) has been used as an efficient and economical method in producing coarse NdFeB powder. This article studied the effects of hydrogen on the Nd Dy Fe B magnets, such as HD powder oxidation and magnetic performance of sintered magnets. The results showed that the hydrogen accelerated the oxidation of the coarse Nd Dy Fe B powder after HD process, and the dehydrogenated powder had higher oxidation resistance, especially degassed at higher temperature, and the hydrogen dropped the sintering temperature of Nd Dy Fe B magnets. The effects of hydrogen may focus on that hydrogen bonds accelerate absorption of water from ambient air, and the defects caused by hydrogen induce oxygen diffusing more quickly. The magnets could be sintered at a lower temperature with un dehydrogenated HD powder, but had poorer orientation degree.

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譚春林 白書欣 張虹 張家春 蔡珣.氫對Nd—Dy—Fe—B磁體制作過程的影響[J].稀有金屬材料與工程,2003,(6):460~463.[Tan Chunlin, Bai Shuxin, Zhang Hong, Zhang Jiachun, Cai Xun. Effect of Hydrogen on the Process of Nd-Dy-Fe-B Magnets[J]. Rare Metal Materials and Engineering,2003,(6):460~463.]
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  • 最后修改日期:2002-07-15
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