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Neodymium Magnets, Sample 22: 73Fe-8B-19Nd Sintered (Sagawa 1988)
Neodymium magnets are iron, boron and neodymium. Sagawa's team at Sumitomo melted the three together, ground the casting to a powder finer than 10 µm, lined the grains up in a magnetic field while pressing them, and sintered the compact in argon. This is their sample 22, 73 % iron, 8 % boron and 19 % neodymium by atoms: 28.0 MGOe.
Source: M. Sagawa et al. (Sumitomo Special Metals), US 4,770,723 (1988). Unknown: how the pure iron, the ferroboron and the neodymium metal are made; the patent does not say. The magnetising is ours, after Przybylski et al., Sensors 16:569 (2016). The 1 kg weights are our arithmetic from the patent's atomic percentages. Picture: the patent's Fig. 8.
专家
2 days
说明
1
1
Weigh sample 22: 73 Fe, 8 B, 19 Nd
Weigh sample 22: 73 Fe, 8 B, 19 Nd
Sample 22 is 73 % iron, 8 % boron and 19 % neodymium by atoms. Use 99.9 % electrolytic iron, ferroboron (19.38 % B, 5.32 % Al, 0.74 % Si, 0.03 % C, the rest iron) and neodymium of 99.7 % or better. Ours: a 1 kg melt, by arithmetic: 542.3 g iron, 64.6 g ferroboron, 397.0 g neodymium. Unknown: how these three are made.
此步骤所需材料：
电解铁542.3 克
硼铁64.6 克
金属钕397 克所需工具：
等臂天平2
2
Melt by high frequency in argon and cast
Melt by high frequency in argon and cast
Melt the charge in a high-frequency (induction) furnace under argon and pour it into a water-cooled copper mould.
所需工具：
感应炉
耐火黏土坩埚
氩
高压气瓶
水冷铜模
耐热手套3
3
Stamp to 35 mesh, ball-mill to 3-10 µm
Stamp to 35 mesh, ball-mill to 3-10 µm
Crush the casting in a stamp mill until it passes a 35-mesh sieve. Then grind it in a ball mill for 3 hours, to 3-10 µm.
所需工具：
捣矿机
筛组（分级筛网）
铁球磨机
安全眼镜4
4
Press in a 10 kOe field at 1.5 t/cm²
Press in a 10 kOe field at 1.5 t/cm²
Line the powder up in a magnetic field of 10 kOe and press it at 1.5 tonnes per cm². Unknown: the size and shape of the magnets.
所需工具：
磁场压机5
5
Sinter in argon at 1000-1200 °C
Sinter in argon at 1000-1200 °C
Sinter the compacts at 1000-1200 °C for about one hour in argon, then let them cool. Sample 22 measured 10.9 kG remanence, 11.4 kOe coercivity and 28.0 MGOe.
所需工具：
管式炉氩高压气瓶耐热手套6
6
Magnetise the magnets
Magnetise the magnets
Ours, after Przybylski et al., Sensors 16:569 (2016): put each magnet in the coil of an impulse magnetiser and discharge a capacitor bank through it. They found a field of 1200 kA/m enough to saturate N38 sintered Nd-Fe-B; their magnetiser used a 1 mF bank charged up to 5000 V, a thyristor switch and a 440-turn coil of 3 mm copper wire with an 80 mm bore.
所需工具：
充磁机
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