排序方式: 共有59条查询结果,搜索用时 328 毫秒
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经配料、熔炼、制粉、成型和烧结后制备了(PrNd)xAl0.6Nb0.5Cu0.15B1.05Fe97.7-x(质量百分比)合金,将该合金分别采用1.5GPa和3.0GPa的压强进行压制,研究了此高压对其显微结构和磁性能的影响.分析发现,该块状合金承受的压强越高,其外观和微观结构破坏越严重,抗弯强度也会降低,但高温抗氧化性能却有一定程度的提高.与没有经过高压处理的磁体相比,经过1.5GPa和3.0GPa高压的样品最大磁能积分别提高了7.69kJ.m^-1和0.94kJ.m^-1,剩余磁通密度分别提高了0.02T和0.01L内禀矫顽力分别提高了20.06kA.m-1和30.33kA.m^-1.结果表明,高压对块状NdFeB烧结磁体的显微结构和力学性能及磁性能均有一定的影响. 相似文献
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让NdFeB小磁体在铝管中下落,通过改变铝管及NdFeB小磁体的尺寸,测量出NdFeB小磁体的下落时间.通过数据分析,得出了一些有用的结论,可供制作此类仪器者参考. 相似文献
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NdFeB 稀土永磁材料阻氢涂层的制备 总被引:2,自引:1,他引:2
从NdFeB稀土永磁材料阻氢的角度出发,对NdFeB阻氢涂层的制备进行了研究。利用厚膜烧结方法和浸涂法在NdFeB磁体表面涂覆Ag/聚合物复合涂层作为NdFeB磁体的阻氢涂层,高压充氢实验结果表明,在10MPa,25 ℃的氢环境中,粘结NdFeB磁体充氢480min未粉碎,最高可达600min,烧结NdFeB磁体充氢180min未粉碎,最高可达280min。NdFeB磁体涂层Ag/聚合物复合涂层前后的磁性能几乎没有变化。 相似文献
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Shoudong MaoHengxiu Yang Feng HuangTingting Xie Zhenlun Song 《Applied Surface Science》2011,257(9):3980-3984
Al/Al2O3 multilayers were deposited on sintered NdFeB magnets to improve the corrosion resistance. The amorphous Al2O3 films were used to periodically interrupt the columnar growth of the Al layers. The structure of the multilayers was investigated by Scanning Electron Microscopy (SEM) and High Resolution Transmission Electron Microscopy (HRTEM). It was found that the columnar structure was effectively inhibited in the multilayers. Subsequent corrosion testing by potentiodynamic polarization in 3.5 wt.% NaCl and neutral salt spray test (NSS) revealed that the Al/Al2O3 multilayers had much better corrosion resistance than the Al single layer. Furthermore, for multilayers with similar thickness, the corrosion resistance was improved as the period decreased. 相似文献