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Barium Ferrite Disc Magnet: Fired in Carbon Dioxide, Pressed at 12 t/cm² (Went, Philips 1956, Ex. 33)
A barium ferrite made with more iron oxide, 0.4 mol barium carbonate to 3.6 mol, fired an hour at 1300 °C in carbon dioxide. Little oxygen gives the hexagonal crystal BaFe18O27, with some iron in the lower state. It is milled again, bound with nitrocellulose or polyvinyl alcohol, and pressed hard at 12 tonnes per cm². Went's rod held 1,260 gauss with a coercive force of 700 oersted.
Source: J. J. Went, G. W. van Oosterhout and E. W. Gorter (Philips), US 2,762,777 (1956), Example 33. They sintered rods; discs and the magnetising are ours. Picture: ferrite magnets, Omegatron, Wikimedia Commons, CC BY-SA 3.0.
高级
2 days
说明
1
1
Weigh barium carbonate and iron oxide
Weigh barium carbonate and iron oxide
Weigh 79.4 g barium carbonate (0.4 mol) and 580.9 g ferric oxide (3.6 mol). Barium carbonate is poisonous if swallowed: gloves and a dust respirator.
此步骤所需材料：
碳酸钡（毒重石）79.4 克
氧化铁580.9 克所需工具：
等臂天平
橡胶手套
P100 防毒面具2
2
Mill 15.5 hours, press a pastille, fire in CO2
Mill 15.5 hours, press a pastille, fire in CO2
Grind with alcohol in a ball mill for 15.5 hours, dry, and press into a pastille. Heat it at 1300 °C in carbon dioxide for 1 hour (ours: a tube furnace fed from a CO2 cylinder).
所需工具：
铁球磨机
乙醇——实验级，95 %
干燥炉
液压机
圆片压模
管式炉
二氧化碳气体
高压气瓶
耐热手套3
3
Pulverise, mill 14 hours, bind
Pulverise, mill 14 hours, bind
Crush the cooled pastille and grind it with alcohol for 14 hours. Press the powder into a pastille again with a ceramic binder (ours: polyvinyl alcohol, one of the two named), then crush it to grains.
此步骤所需材料：
聚乙烯醇粉末1 as required所需工具：
铁球磨机乙醇——实验级，95 %液压机圆片压模4
4
Press at 12 tonnes per cm²
Press at 12 tonnes per cm²
Press the grains at 12 tonnes per cm² (ours: discs instead of rods). The patent describes no further firing.
所需工具：
液压机圆片压模5
5
Magnetise the discs
Magnetise the discs
The patent gives no magnetising method. Ours: lay a disc with its faces against the poles of a strong electromagnet, switch the current on, then off. Find which face is north with a compass.
所需工具：
电磁铁
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