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首页> 外文期刊>Intermetallics >Effect of sintering temperature on the structure and magnetic properties of SmCo_5/Fe nanocomposite magnets prepared by spark plasma sintering
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Effect of sintering temperature on the structure and magnetic properties of SmCo_5/Fe nanocomposite magnets prepared by spark plasma sintering

机译：烧结温度对火花等离子体烧结制备的SmCo_5 / Fe纳米复合磁体结构和磁性能的影响

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摘要

Highly dense SmCos/Fe nanocomposite bulk magnets were prepared by spark plasma sintering of magnetic field-milled SmCos/Fe nanocrsytalline powders. The sintering experiments were conducted with varying temperatures of 973-1123 K. The resultant bulk materials had densities of 85-98% and mean grain sizes of 17-30 nm. The SEM analysis showed that the bulk samples prepared at higher sintering temperature exhibited dense and uniform microstructure. The XRD studies in complement with energy dispersive x-ray analysis revealed that the bulk magnets sintered at or above 1073 K exhibited Sm(Co,Fe)_5 as main phase, along with other secondary phases such as Sm_2(Co,Fe)_(17) and α-Fe(Co). A single-phase behavior with high remanence ratios (0.67-0.77) for the nanocomposite magnets was demonstrated by the magnetic measurements. In the present study, the sintering temperature of 1073 K was found to be optimum in achieving relatively high coercivity (8.2 kOe), magnetization (97.5 emu/g) and energy product (69.6 kj/m~3) for the SmCos/Fe nanocomposite bulk magnets.
机译：高密度SmCos / Fe纳米复合块状磁体是通过磁场研磨的SmCos / Fe纳米晶形粉末的火花等离子体烧结制备的。烧结实验是在973-1123 K的不同温度下进行的。所得块状材料的密度为85-98％，平均晶粒尺寸为17-30 nm。 SEM分析表明，在较高的烧结温度下制备的块状样品表现出致密且均匀的微观结构。 X射线衍射研究与能量色散X射线分析相辅相成，发现在1073 K或更高温度下烧结的块状磁体表现出Sm（Co，Fe）_5作为主相，以及其他次生相，例如Sm_2（Co，Fe）_（ 17）和α-Fe（Co）。通过磁性测量证明了纳米复合磁体具有高剩磁比（0.67-0.77）的单相行为。在本研究中，发现1073 K的烧结温度对于实现SmCos / Fe纳米复合材料的相对较高的矫顽力（8.2 kOe），磁化强度（97.5 emu / g）和能量积（69.6 kj / m〜3）是最佳的大块磁铁。

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