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Barium Ferrite Disc Magnet: 1 mol BaCO3 to 2.5 mol Iron Oxide, 1310 °C (Went, Philips 1956, Ex. 1)
Went's first barium ferrite: 1 mol barium carbonate to 2.5 mol iron oxide, milled 13.5 hours, bound, formed and passed through a 1310 °C furnace in 20 minutes. His rod held 1,200 gauss with a coercive force of 1,940 oersted.
Source: J. J. Went, G. W. van Oosterhout and E. W. Gorter (Philips), US 2,762,777 (1956), Example 1. 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 201.1 g barium carbonate (1 mol) and 400.5 g ferric oxide (2.5 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）201.1 克
氧化铁400.5 克所需工具：
等臂天平
橡胶手套
P100 防毒面具2
2
Mill with alcohol 13.5 hours, dry and sieve
Mill with alcohol 13.5 hours, dry and sieve
Grind the mixture with alcohol in a ball mill for 13.5 hours, then dry it and sieve it.
所需工具：
铁球磨机
乙醇——实验级，95 %
干燥炉
粗筛3
3
Knead with a binder and form
Knead with a binder and form
Mix 300 g of the powder with a binder such as polyvinyl alcohol (Went names it or nitrocellulose) into a kneadable mass. The patent extrudes rods about 3 mm across; ours: press discs at 1.5 tonnes per cm², as in its other examples. Dry them in air for about 24 hours.
所需工具：
聚乙烯醇粉末
液压机
圆片压模干燥炉4
4
Pass through a 1310 °C zone in 20 minutes
Pass through a 1310 °C zone in 20 minutes
Sinter in air at 1310 °C by passing the pieces through a 10 cm hot zone at 5 mm per minute: 20 minutes in the heat.
所需工具：
管式炉
耐热手套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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