An improved HDDR treatment for the production of anisotropic Nd–Fe–B ternary powders
An improved HDDR treatment for the production of anisotropic Nd–Fe–B ternary powders
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DOI：
10.1016/s0925-8388(01)01503-1
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发表时间：
2002-01
影响因子：
6.2
通讯作者：
S. Sugimoto;N. Koike;D. Book;T. Kagotani;M. Okada;K. Inomata;M. Homma
中科院分区：
文献类型：
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作者：
S. Sugimoto;N. Koike;D. Book;T. Kagotani;M. Okada;K. Inomata;M. Homma
研究了Nd12.2Fe81.8B6.0合金经新型HDDR（氢化-脱附-再结合）处理后的磁性能。这种新提出的HDDR处理是在接近Nd 2Fe 14 B化合物的复合压力的氢压力下的热处理的组合，在双晶化和复合阶段。换句话说，这种新处理是l-HD（在加氢歧化阶段期间在低H2压力下加热）和s-DR（在复合开始时在Ar或相对高压的氢气中加热）处理的组合。本文研究了s-DR条件对各向异性Nd-Fe-B HDDR处理粉末磁性能的影响。结果发现，s-DR处理，其中氢压力从0.1 MPa逐步降低到0.5 kPa，增强剩磁（1.45 T）和各向异性（Br/Js=0.94）。在s-DR期间氢压力降低到6 kPa的速率也被认为是获得高剩磁和高矫顽力的重要因素。此外，发现在其中温度以逐步方式降低的s-DR处理之后，结晶度增加。
The magnetic properties of Nd12.2Fe81.8B6.0alloys processed using a new HDDR (hydrogenation disproportionation desorption recombination) treatment were investigated. This newly proposed HDDR treatment is a combination of heat treatments at hydrogen pressures close to the recombination pressure of the Nd2Fe14B compound, in both the disproportionation and recombination stages. In other words, this new treatment is a combination of the l-HD (heating in a low H2pressure during the hydrogenation disproportionation stage), and s-DR (heating in Ar or in a relatively high pressure of hydrogen, at the start of recombination) treatments. In this investigation, the influence of the s-DR conditions on the magnetic properties of anisotropic Nd–Fe–B HDDR-treated powders, were investigated. It was found that an s-DR treatment in which the hydrogen pressure was decreased in steps from 0.1 MPa to 0.5 kPa, enhanced the remanence (1.45 T) and anisotropy (Br/Js=0.94). The rate at which the hydrogen pressure decreases to 6 kPa during s-DR is also considered to be an important factor in obtaining both a high remanence and a high coercivity. In addition, the coercivity was found to increase after an s-DR treatment in which the temperature was decreased in a step by step manner.