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首页> 外文会议>第19届国际稀土永磁及应用研讨会（19th International Workshop on Rare Earth Permanent Magnets amp; Their Applications）（REPM'06） >Hydrogen Decrepitation and Recycling of NdFeB-type Sintered Magnets
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Hydrogen Decrepitation and Recycling of NdFeB-type Sintered Magnets

机译：NdFeB型烧结磁体的氢爆破与循环利用

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With the rapid growth in the use of NdFeB-type magnets and with the growing environmental need to conserve both energy and raw materials, the recycling of these magnets is becoming an ever important issue. In this paper it is demonstrated that hydrogen could play a vital role in this process. Fully dense, sintered NdFeB-type magnets have been subjected to the hydrogen decrepitation (HD) process. The resultant powder has been subsequently processed in one of two ways in order to produce permanent magnets. Firstly, the powder was subjected to a vacuum degassing treatment over a range of temperatures up to 1000℃ in order to produce powder that would be suitable for the production of anisotropic bonded or hot pressed magnets. Secondly, the HD-powder has been used to produce fully dense sintered magnets; in which case optimisation of the milling time, sintering temperature and time was carried out. The optimum degassing temperature for coercive powder was found to be 700℃, giving powder with a remanence (Br) of ～1350mT (±10 mT) and an intrinsic coercivity (Hcj) of ～750kAm-1 (±10 kAm-1). The best sintered magnet was produced by very lightly milling the powder (30 min, roller ball mill), aligning, pressing and vacuum sintering at 1080℃ for 1 hour. The magnetic properties of this magnet were: (BH)max = 290 kJm-3 (±5 kJm-3), Br = 1240mT (±5 mT) and Hcj = 830 kAm-1 (±5 kAm-1); representing decreases of 15%, 10%, and 20% respectively, from the properties of the initial magnet.
机译：随着钕铁硼（NdFeB）型磁体的使用迅速增长，以及对节约能源和原材料的日益增长的环境需求，这些磁体的回收利用已成为一个日益重要的问题。本文证明了氢气在该过程中可能起着至关重要的作用。完全致密的NdFeB烧结磁体已经过氢爆破（HD）工艺。随后以两种方式之一对所得粉末进行处理，以生产永磁体。首先，将粉末在高达1000℃的温度范围内进行真空脱气处理，以生产适合于生产各向异性粘结磁体或热压磁体的粉末。其次，高清粉末已被用于生产完全致密的烧结磁铁。在这种情况下，对研磨时间，烧结温度和时间进行了优化。矫顽粉末的最佳脱气温度为700℃，剩余粉末的剩余磁化强度（Br）为〜1350mT（±10 mT），固有矫顽力（Hcj）为〜750kAm-1（±10 kAm-1）。最好的烧结磁体是通过将粉末进行非常轻微的研磨（30分钟，辊式球磨机），对准，压制和在1080℃下真空烧结1小时来生产的。该磁体的磁性能为：（BH）max = 290 kJm-3（±5 kJm-3），Br = 1240mT（±5 mT）和Hcj = 830 kAm-1（±5 kAm-1）；分别比初始磁体的性能降低了15％，10％和20％。

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